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
Jun. 30, 2018
Dec. 31, 2017
Schedule of Available-for-sale Securities [Line Items]    
Less than 12 Months $ 6,805 $ 5,545
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 170 61
Over 12 Months 6,368 6,728
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 312 225
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value 13,173 12,273
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss (482) (286)
Available-for-sale Securities, Debt Maturities, Single Maturity Date, Amortized Cost Basis [Abstract]    
Amortized Cost 14,539 15,127
Unrealized Gross Gains 13 28
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax (482) (286)
Available-for-sale Securities, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract]    
Available-for-sale securities 14,070 14,869
U.S. Treasury    
Available-for-sale Securities, Debt Maturities, Single Maturity Date, Amortized Cost Basis [Abstract]    
Amortized Cost, Under 1 year 6 5
Amortized Cost 6 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 6 5
Available-for-sale securities 6 5
Collateralized Mortgage Obligations [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Less than 12 Months 3,217 1,660
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 86 19
Over 12 Months 3,988 4,520
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 218 159
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value 7,205  
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss (304)  
Available-for-sale Securities, Debt Maturities, Single Maturity Date, Amortized Cost Basis [Abstract]    
Amortized Cost, 1-5 years 0 1
Amortized Cost, 6-10 years 44 90
Amortized Cost, Over 10 years 7,510 6,570
Amortized Cost 7,554 6,661
Unrealized Gross Gains 0 1
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax (304) (178)
Available-for-sale Securities, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract]    
Fair Value, 1-5 years 0 1
Fair Value, 6-10 years 42 89
Fair Value, Over 10 years 7,208 6,394
Available-for-sale securities 7,250 6,484
Residential Mortgage Backed Securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Less than 12 Months 638 1,078
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 19 5
Over 12 Months 12 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 650 1,089
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss (19) (5)
Available-for-sale Securities, Debt Maturities, Single Maturity Date, Amortized Cost Basis [Abstract]    
Amortized Cost, 1-5 years 4 6
Amortized Cost, 6-10 years 31 7
Amortized Cost, Over 10 years 643 1,358
Amortized Cost 678 1,371
Unrealized Gross Gains 0 1
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax (19) (5)
Available-for-sale Securities, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract]    
Fair Value, 1-5 years 4 6
Fair Value, 6-10 years 30 8
Fair Value, Over 10 years 625 1,353
Available-for-sale securities 659 1,367
Commercial Mortgage Backed Securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Less than 12 Months 285 960
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 9 15
Over 12 Months 1,458 1,527
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 63 37
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value 1,743 2,487
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss (72) (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 1,737 2,365
Amortized Cost 1,815 2,539
Unrealized Gross Gains 0 0
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax (72) (52)
Available-for-sale Securities, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract]    
Fair Value, 1-5 years 66 22
Fair Value, 6-10 years 8 148
Fair Value, Over 10 years 1,669 2,317
Available-for-sale securities 1,743 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 88 39
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 2 0
Over 12 Months 85 0
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 3 0
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value 173 39
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss (5) 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 179 58
Amortized Cost 188 69
Unrealized Gross Gains 0 1
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax (5) 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 174 59
Available-for-sale securities 183 70
Total U.S. Treasury, Federal agency and other agency securities    
Schedule of Available-for-sale Securities [Line Items]    
Less than 12 Months 4,228 3,737
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 116 39
Over 12 Months 5,543 6,058
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 284 196
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value 9,771 9,795
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss (400) (235)
Available-for-sale Securities, Debt Maturities, Single Maturity Date, Amortized Cost Basis [Abstract]    
Amortized Cost 10,241 10,645
Unrealized Gross Gains 0 3
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax (400) (235)
Available-for-sale Securities, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract]    
Available-for-sale securities 9,841 10,413
Municipal securities    
Schedule of Available-for-sale Securities [Line Items]    
Less than 12 Months 2,306 1,681
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 49 21
Over 12 Months 723 497
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 24 14
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value 3,029 2,178
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss (73) (35)
Available-for-sale Securities, Debt Maturities, Single Maturity Date, Amortized Cost Basis [Abstract]    
Amortized Cost, Under 1 year 164 103
Amortized Cost, 1-5 years 1,115 1,140
Amortized Cost, 6-10 years 1,702 1,709
Amortized Cost, Over 10 years 845 940
Amortized Cost 3,826 3,892
Unrealized Gross Gains 12 21
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax (73) (35)
Available-for-sale Securities, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract]    
Fair Value, Under 1 year 164 103
Fair Value, 1-5 years 1,105 1,134
Fair Value, 6-10 years 1,674 1,704
Fair Value, Over 10 years 822 937
Available-for-sale securities 3,765 3,878
Asset-backed securities    
Schedule of Available-for-sale Securities [Line Items]    
Less than 12 Months 210 127
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 4 1
Over 12 Months 102 173
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 4 15
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value 312 300
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 40 80
Amortized Cost, 6-10 years 46 53
Amortized Cost, Over 10 years 295 349
Amortized Cost 381 482
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 39 80
Fair Value, 6-10 years 46 54
Fair Value, Over 10 years 288 333
Available-for-sale securities 373 467
Corporate debt    
Schedule of Available-for-sale Securities [Line Items]    
Less than 12 Months 61  
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 1  
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 61  
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss (1)  
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 75 73
Amortized Cost, 6-10 years 11 20
Amortized Cost, Over 10 years 0 13
Amortized Cost 87 106
Unrealized Gross Gains 1 3
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax (1) 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 74 74
Fair Value, 6-10 years 12 21
Fair Value, Over 10 years 0 14
Available-for-sale securities 87 109
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 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 0  
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 0 1
Amortized Cost, 1-5 years 4 1
Amortized Cost 4 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 0 1
Fair Value, 1-5 years 4 1
Available-for-sale securities $ 4 $ 2