Quarterly report pursuant to Section 13 or 15(d)

AVAILABLE-FOR-SALE SECURITIES - Contractual Maturities (Details)

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AVAILABLE-FOR-SALE SECURITIES - Contractual Maturities (Details) - USD ($)
$ in Millions
Mar. 31, 2018
Dec. 31, 2017
Schedule of Available-for-sale Securities [Line Items]    
Less than 12 Months $ 6,804 $ 5,545
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 145 61
Over 12 Months 6,345 6,728
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 271 225
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value 13,149 12,273
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss (416) (286)
Available-for-sale Securities, Debt Maturities, Single Maturity Date, Amortized Cost Basis [Abstract]    
Amortized Cost 15,005 15,127
Unrealized Gross Gains 18 28
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax (416) (286)
Available-for-sale Securities, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract]    
Available-for-sale securities 14,607 14,869
U.S. Treasury    
Available-for-sale Securities, Debt Maturities, Single Maturity Date, Amortized Cost Basis [Abstract]    
Amortized Cost, Under 1 year 5 5
Amortized Cost 5 5
Unrealized Gross Gains 0 0
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax 0 0
Available-for-sale Securities, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract]    
Fair Value, Under 1 year 5 5
Available-for-sale securities 5 5
Collateralized Mortgage Obligations [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Less than 12 Months 3,291 1,660
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 71 19
Over 12 Months 4,027 4,520
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 188 159
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value 7,318  
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss (259)  
Available-for-sale Securities, Debt Maturities, Single Maturity Date, Amortized Cost Basis [Abstract]    
Amortized Cost, 1-5 years 1 1
Amortized Cost, 6-10 years 47 90
Amortized Cost, Over 10 years 7,742 6,570
Amortized Cost 7,790 6,661
Unrealized Gross Gains 0 1
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax (259) (178)
Available-for-sale Securities, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract]    
Fair Value, 1-5 years 1 1
Fair Value, 6-10 years 45 89
Fair Value, Over 10 years 7,485 6,394
Available-for-sale securities 7,531 6,484
Residential Mortgage Backed Securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Less than 12 Months 648 1,078
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 16 5
Over 12 Months 11 11
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 0 0
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value 659 1,089
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss (16) (5)
Available-for-sale Securities, Debt Maturities, Single Maturity Date, Amortized Cost Basis [Abstract]    
Amortized Cost, 1-5 years 6 6
Amortized Cost, 6-10 years 33 7
Amortized Cost, Over 10 years 700 1,358
Amortized Cost 739 1,371
Unrealized Gross Gains 2 1
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax (16) (5)
Available-for-sale Securities, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract]    
Fair Value, 1-5 years 5 6
Fair Value, 6-10 years 33 8
Fair Value, Over 10 years 686 1,353
Available-for-sale securities 724 1,367
Commercial Mortgage Backed Securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Less than 12 Months 322 960
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 9 15
Over 12 Months 1,469 1,527
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 54 37
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value 1,791 2,487
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss (63) (52)
Available-for-sale Securities, Debt Maturities, Single Maturity Date, Amortized Cost Basis [Abstract]    
Amortized Cost, 1-5 years 69 23
Amortized Cost, 6-10 years 9 151
Amortized Cost, Over 10 years 1,775 2,365
Amortized Cost 1,853 2,539
Unrealized Gross Gains 0 0
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax (63) (52)
Available-for-sale Securities, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract]    
Fair Value, 1-5 years 67 22
Fair Value, 6-10 years 8 148
Fair Value, Over 10 years 1,716 2,317
Available-for-sale securities 1,791 2,487
Federal agencies: Mortgage-backed securities    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value   6,180
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss   (178)
Federal agencies, Other agencies    
Schedule of Available-for-sale Securities [Line Items]    
Less than 12 Months 107 39
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 1 0
Over 12 Months 69 0
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 2 0
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value 176 39
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss (3) 0
Available-for-sale Securities, Debt Maturities, Single Maturity Date, Amortized Cost Basis [Abstract]    
Amortized Cost, Under 1 year 1 2
Amortized Cost, 1-5 years 8 9
Amortized Cost, 6-10 years 181 58
Amortized Cost 190 69
Unrealized Gross Gains 0 1
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax (3) 0
Available-for-sale Securities, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract]    
Fair Value, Under 1 year 1 2
Fair Value, 1-5 years 8 9
Fair Value, 6-10 years 178 59
Available-for-sale securities 187 70
Total U.S. Treasury, Federal agency and other agency securities    
Schedule of Available-for-sale Securities [Line Items]    
Less than 12 Months 4,368 3,737
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 97 39
Over 12 Months 5,576 6,058
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 244 196
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value 9,944 9,795
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss (341) (235)
Available-for-sale Securities, Debt Maturities, Single Maturity Date, Amortized Cost Basis [Abstract]    
Amortized Cost 10,577 10,645
Unrealized Gross Gains 2 3
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax (341) (235)
Available-for-sale Securities, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract]    
Available-for-sale securities 10,238 10,413
Municipal securities    
Schedule of Available-for-sale Securities [Line Items]    
Less than 12 Months 2,182 1,681
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 45 21
Over 12 Months 623 497
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 22 14
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value 2,805 2,178
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss (67) (35)
Available-for-sale Securities, Debt Maturities, Single Maturity Date, Amortized Cost Basis [Abstract]    
Amortized Cost, Under 1 year 153 103
Amortized Cost, 1-5 years 1,129 1,140
Amortized Cost, 6-10 years 1,738 1,709
Amortized Cost, Over 10 years 867 940
Amortized Cost 3,887 3,892
Unrealized Gross Gains 14 21
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax (67) (35)
Available-for-sale Securities, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract]    
Fair Value, Under 1 year 153 103
Fair Value, 1-5 years 1,121 1,134
Fair Value, 6-10 years 1,717 1,704
Fair Value, Over 10 years 843 937
Available-for-sale securities 3,834 3,878
Asset-backed securities    
Schedule of Available-for-sale Securities [Line Items]    
Less than 12 Months 240 127
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 3 1
Over 12 Months 144 173
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 5 15
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value 384 300
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss (8) (16)
Available-for-sale Securities, Debt Maturities, Single Maturity Date, Amortized Cost Basis [Abstract]    
Amortized Cost, 1-5 years 80 80
Amortized Cost, 6-10 years 61 53
Amortized Cost, Over 10 years 294 349
Amortized Cost 435 482
Unrealized Gross Gains 0 1
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax (8) (16)
Available-for-sale Securities, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract]    
Fair Value, 1-5 years 79 80
Fair Value, 6-10 years 60 54
Fair Value, Over 10 years 288 333
Available-for-sale securities 427 467
Corporate debt    
Schedule of Available-for-sale Securities [Line Items]    
Less than 12 Months 14  
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 0  
Over 12 Months 0  
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 0  
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value 14  
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss 0  
Available-for-sale Securities, Debt Maturities, Single Maturity Date, Amortized Cost Basis [Abstract]    
Amortized Cost, Under 1 year 1 0
Amortized Cost, 1-5 years 67 73
Amortized Cost, 6-10 years 19 20
Amortized Cost, Over 10 years 13 13
Amortized Cost 100 106
Unrealized Gross Gains 2 3
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax 0 0
Available-for-sale Securities, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract]    
Fair Value, Under 1 year 1 0
Fair Value, 1-5 years 67 74
Fair Value, 6-10 years 20 21
Fair Value, Over 10 years 14 14
Available-for-sale securities 102 109
Other securities/Sovereign debt    
Schedule of Available-for-sale Securities [Line Items]    
Less than 12 Months 0  
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 0  
Over 12 Months 2  
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 0  
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value 2  
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss 0  
Available-for-sale Securities, Debt Maturities, Single Maturity Date, Amortized Cost Basis [Abstract]    
Amortized Cost, Under 1 year 2 1
Amortized Cost, 1-5 years 4 1
Amortized Cost 6 2
Unrealized Gross Gains 0 0
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax 0 0
Available-for-sale Securities, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract]    
Fair Value, Under 1 year 2 1
Fair Value, 1-5 years 4 1
Available-for-sale securities $ 6 $ 2