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
Sep. 30, 2018
Dec. 31, 2017
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost $ 14,279 $ 15,127
Unrealized Gross Gains 12 28
Unrealized Gross Losses (564) (286)
Fair Value 13,727 14,869
U.S. Treasury    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 5 5
Unrealized Gross Gains 0 0
Unrealized Gross Losses 0 0
Fair Value 5 5
Collateralized Mortgage Obligations [Member]    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 7,307 6,661
Unrealized Gross Gains 0 1
Unrealized Gross Losses (367) (178)
Fair Value 6,940 6,484
Residential Mortgage Backed Securities [Member]    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 646 1,371
Unrealized Gross Gains 0 1
Unrealized Gross Losses (26) (5)
Fair Value 620 1,367
Commercial Mortgage Backed Securities [Member]    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 1,783 2,539
Unrealized Gross Gains 0 0
Unrealized Gross Losses (80) (52)
Fair Value 1,703 2,487
Federal agencies, Other agencies    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 162 69
Unrealized Gross Gains 0 1
Unrealized Gross Losses (5) 0
Fair Value 157 70
Total U.S. Treasury, Federal agency and other agency securities    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 9,903 10,645
Unrealized Gross Gains 0 3
Unrealized Gross Losses (478) (235)
Fair Value 9,425 10,413
Municipal securities    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 3,914 3,892
Unrealized Gross Gains 11 21
Unrealized Gross Losses (77) (35)
Fair Value 3,848 3,878
Asset-backed securities    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 372 482
Unrealized Gross Gains 0 1
Unrealized Gross Losses (9) (16)
Fair Value 363 467
Corporate debt    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 86 106
Unrealized Gross Gains 1 3
Unrealized Gross Losses 0 0
Fair Value 87 109
Other securities/Sovereign debt    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 4 2
Unrealized Gross Gains 0 0
Unrealized Gross Losses 0 0
Fair Value $ 4 $ 2