Quarterly report pursuant to Section 13 or 15(d)

AVAILABLE-FOR-SALE SECURITIES - Schedule of Amortized Cost, Fair Value, and Gross Unrealized Gains and Losses (Details)

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AVAILABLE-FOR-SALE SECURITIES - Schedule of Amortized Cost, Fair Value, and Gross Unrealized Gains and Losses (Details) - USD ($)
$ in Millions
Mar. 31, 2018
Dec. 31, 2017
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost $ 15,005 $ 15,127
Unrealized Gross Gains 18 28
Unrealized Gross Losses (416) (286)
Fair Value 14,607 14,869
U.S. Treasury    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 5 5
Unrealized Gross Gains 0 0
Unrealized Gross Losses 0 0
Fair Value 5 5
Collateralized Mortgage Obligations [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 7,790 6,661
Unrealized Gross Gains 0 1
Unrealized Gross Losses (259) (178)
Fair Value 7,531 6,484
Residential Mortgage Backed Securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 739 1,371
Unrealized Gross Gains 2 1
Unrealized Gross Losses (16) (5)
Fair Value 724 1,367
Commercial Mortgage Backed Securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 1,853 2,539
Unrealized Gross Gains 0 0
Unrealized Gross Losses (63) (52)
Fair Value 1,791 2,487
Federal agencies, Other agencies    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 190 69
Unrealized Gross Gains 0 1
Unrealized Gross Losses (3) 0
Fair Value 187 70
Total U.S. Treasury, Federal agency and other agency securities    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 10,577 10,645
Unrealized Gross Gains 2 3
Unrealized Gross Losses (341) (235)
Fair Value 10,238 10,413
Municipal securities    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 3,887 3,892
Unrealized Gross Gains 14 21
Unrealized Gross Losses (67) (35)
Fair Value 3,834 3,878
Asset-backed securities    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 435 482
Unrealized Gross Gains 0 1
Unrealized Gross Losses (8) (16)
Fair Value 427 467
Corporate debt    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 100 106
Unrealized Gross Gains 2 3
Unrealized Gross Losses 0 0
Fair Value 102 109
Other securities/Sovereign debt    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 6 2
Unrealized Gross Gains 0 0
Unrealized Gross Losses 0 0
Fair Value $ 6 $ 2