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SECURITIES - Schedule of Investments (Details) - USD ($)
$ in Millions
Jun. 30, 2020
Dec. 31, 2019
Schedule of Available-for-sale and Held-to-maturity Securities [Line Items]    
Debt Securities Available-for-sale, Fair Value [1] $ 22,144 $ 20,613
Debt Securities Held-to-maturity, Amortized Cost [1] 2,856 3,202
Debt Securities Held-to-maturity, Gross Unrealized Gain 153 45
Debt Securities Held-to-maturity, Gross Unrealized Losses 0 (5)
Debt Securities held-to-maturity, Fair Value 3,009 3,242
Equity Securities, Amortized Cost 50 47
Equity Securities, Fair Value 50 47
Other equity securities, Amortized Cost 8 8
Other equity securities, Fair Value 8 8
Total equity securities, at cost, Amortized Cost 607 807
Total equity securities, at cost, Fair Value 607 807
U.S. Treasury and other    
Schedule of Available-for-sale and Held-to-maturity Securities [Line Items]    
Debt Securities Available-for-sale, Amortized Cost 11 71
Debt Securities Available-for-sale, Gross Unrealized Gains 0 0
Debt Securities Available-for-sale, Gross Unrealized Losses 0 0
Debt Securities Available-for-sale, Fair Value 11 71
State and political subdivisions    
Schedule of Available-for-sale and Held-to-maturity Securities [Line Items]    
Debt Securities Available-for-sale, Amortized Cost 4 5
Debt Securities Available-for-sale, Gross Unrealized Gains 0 0
Debt Securities Available-for-sale, Gross Unrealized Losses 0 0
Debt Securities Available-for-sale, Fair Value 4 5
Federal agencies and U.S. government sponsored entities    
Schedule of Available-for-sale and Held-to-maturity Securities [Line Items]    
Debt Securities Available-for-sale, Amortized Cost 20,898 19,803
Debt Securities Available-for-sale, Gross Unrealized Gains 648 143
Debt Securities Available-for-sale, Gross Unrealized Losses (4) (71)
Debt Securities Available-for-sale, Fair Value 21,542 19,875
Debt Securities Held-to-maturity, Amortized Cost 2,856 3,202
Debt Securities Held-to-maturity, Gross Unrealized Gain 153 45
Debt Securities Held-to-maturity, Gross Unrealized Losses 0 (5)
Debt Securities held-to-maturity, Fair Value 3,009 3,242
Other/non-agency    
Schedule of Available-for-sale and Held-to-maturity Securities [Line Items]    
Debt Securities Available-for-sale, Amortized Cost 551 638
Debt Securities Available-for-sale, Gross Unrealized Gains 36 24
Debt Securities Available-for-sale, Gross Unrealized Losses 0 0
Debt Securities Available-for-sale, Fair Value 587 662
Total mortgage-backed securities, at fair value    
Schedule of Available-for-sale and Held-to-maturity Securities [Line Items]    
Debt Securities Available-for-sale, Amortized Cost 21,449 20,441
Debt Securities Available-for-sale, Gross Unrealized Gains 684 167
Debt Securities Available-for-sale, Gross Unrealized Losses (4) (71)
Debt Securities Available-for-sale, Fair Value 22,129 20,537
Total debt securities available for sale, at fair value    
Schedule of Available-for-sale and Held-to-maturity Securities [Line Items]    
Debt Securities Available-for-sale, Amortized Cost 21,464 20,517
Debt Securities Available-for-sale, Gross Unrealized Gains 684 167
Debt Securities Available-for-sale, Gross Unrealized Losses (4) (71)
Debt Securities Available-for-sale, Fair Value 22,144 20,613
Money market mutual fund investments    
Schedule of Available-for-sale and Held-to-maturity Securities [Line Items]    
Equity Securities, Amortized Cost 50 47
Equity Securities, Fair Value 50 47
Federal Reserve Bank stock    
Schedule of Available-for-sale and Held-to-maturity Securities [Line Items]    
Federal Reserve Bank stock, Amortized Cost 577 577
Federal Reserve Bank stock, Fair Value 577 577
Federal Home Loan Bank stock    
Schedule of Available-for-sale and Held-to-maturity Securities [Line Items]    
Federal Home Loan Bank stock, Amortized Cost 22 222
Federal Home Loan Bank stock, Fair Value $ 22 $ 222
[1] Includes only collateral pledged by the Company where counterparties have the right to sell or pledge the collateral.