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SECURITIES - Schedule of Investments (Details) - USD ($)
$ in Millions
Mar. 31, 2019
Dec. 31, 2018
Schedule of Available-for-sale and Held-to-maturity Securities [Line Items]    
Debt Securities Available-for-sale, Fair Value [1] $ 21,504 $ 19,895
Debt Securities Held-to-maturity, Amortized Cost 3,345 4,165
Debt Securities Held-to-maturity, Gross Unrealized Gain 1 8
Debt Securities Held-to-maturity, Gross Unrealized Losses (79) (132)
Debt Securities held-to-maturity, Fair Value 3,267 4,041
Equity Securities, Amortized Cost 198 181
Equity Securities, Fair Value 198 181
Other equity securities, Amortized Cost 8 7
Other equity securities, Fair Value 8 7
Total equity securities, at cost, Amortized Cost 604 834
Total equity securities, at cost, Fair Value 604 834
U.S. Treasury and other    
Schedule of Available-for-sale and Held-to-maturity Securities [Line Items]    
Debt Securities Available-for-sale, Amortized Cost 72 24
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 72 24
State and political subdivisions    
Schedule of Available-for-sale and Held-to-maturity Securities [Line Items]    
Debt Securities Available-for-sale, Amortized Cost 5 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 5 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 20,768 20,211
Debt Securities Available-for-sale, Gross Unrealized Gains 66 28
Debt Securities Available-for-sale, Gross Unrealized Losses (337) (605)
Debt Securities Available-for-sale, Fair Value 20,497 19,634
Debt Securities Held-to-maturity, Amortized Cost 3,345 3,425
Debt Securities Held-to-maturity, Gross Unrealized Gain 1 0
Debt Securities Held-to-maturity, Gross Unrealized Losses (79) (132)
Debt Securities held-to-maturity, Fair Value 3,267 3,293
Other/non-agency    
Schedule of Available-for-sale and Held-to-maturity Securities [Line Items]    
Debt Securities Available-for-sale, Amortized Cost 916 236
Debt Securities Available-for-sale, Gross Unrealized Gains 18 3
Debt Securities Available-for-sale, Gross Unrealized Losses (4) (7)
Debt Securities Available-for-sale, Fair Value 930 232
Debt Securities Held-to-maturity, Amortized Cost 0 740
Debt Securities Held-to-maturity, Gross Unrealized Gain 0 8
Debt Securities Held-to-maturity, Gross Unrealized Losses 0 0
Debt Securities held-to-maturity, Fair Value 0 748
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 21,684 20,447
Debt Securities Available-for-sale, Gross Unrealized Gains 84 31
Debt Securities Available-for-sale, Gross Unrealized Losses (341) (612)
Debt Securities Available-for-sale, Fair Value 21,427 19,866
Debt Securities Held-to-maturity, Amortized Cost 3,345 4,165
Debt Securities Held-to-maturity, Gross Unrealized Gain 1 8
Debt Securities Held-to-maturity, Gross Unrealized Losses (79) (132)
Debt Securities held-to-maturity, Fair Value 3,267 4,041
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 21,761 20,476
Debt Securities Available-for-sale, Gross Unrealized Gains 84 31
Debt Securities Available-for-sale, Gross Unrealized Losses (341) (612)
Debt Securities Available-for-sale, Fair Value 21,504 19,895
Money market mutual fund investments    
Schedule of Available-for-sale and Held-to-maturity Securities [Line Items]    
Equity Securities, Amortized Cost 198 181
Equity Securities, Fair Value 198 181
Federal Reserve Bank stock    
Schedule of Available-for-sale and Held-to-maturity Securities [Line Items]    
Federal Reserve Bank stock, Amortized Cost 463 463
Federal Reserve Bank stock, Fair Value 463 463
Federal Home Loan Bank stock    
Schedule of Available-for-sale and Held-to-maturity Securities [Line Items]    
Federal Home Loan Bank stock, Amortized Cost 133 364
Federal Home Loan Bank stock, Fair Value $ 133 $ 364
[1] Includes only collateral pledged by the Company where counterparties have the right to sell or pledge the collateral.