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SECURITIES - Schedule of Investments (Details) - USD ($)
$ in Millions
Sep. 30, 2018
Dec. 31, 2017
Schedule of Available-for-sale and Held-to-maturity Securities [Line Items]    
Debt Securities Available-for-sale, Fair Value [1] $ 20,152 $ 20,157
Debt Securities Held-to-maturity, Amortized Cost 4,284 4,685
Debt Securities Held-to-maturity, Gross Unrealized Gain 1 29
Debt Securities Held-to-maturity, Gross Unrealized Losses (183) (46)
Debt Securities held-to-maturity, Fair Value 4,102 4,668
Money market mutual fund, Amortized Cost 175 165
Money Market Mutual Fund, Gross Unrealized Gain 0 0
Money Market Mutual Fund, Gross Unrealized Loss 0 0
Money market mutual fund, Fair Value 175 165
Total other investment securities, at fair value, Amortized Cost 175 169
Total other investments securities, at fair value, at cost, Gross Unrealized Gains 0 0
Total other investments securities, at fair value, Gross Unrealized Losses 0 0
Total other investment securities, at fair value, Fair Value 175 169
Other Equity Securities, at Cost, Amortized Cost 7 7
Other Equity Securities, at Cost, Gross Unrealized Gain 0 0
Other Equity Securities, at Cost, Gross Unrealized Loss 0 0
Other Equity Securities, at Cost, Fair Value 7 7
Total equity securities, at cost 874 722
Total equity securities, at cost, Gross Unrealized Gain 0 0
Total equity securities, at cost, Gross Unrealized Losses 0 0
Total equity securities, at cost, Fair Value 874 722
U.S. Treasury and other    
Schedule of Available-for-sale and Held-to-maturity Securities [Line Items]    
Debt Securities Available-for-sale, Amortized Cost 12 12
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 12 12
State and political subdivisions    
Schedule of Available-for-sale and Held-to-maturity Securities [Line Items]    
Debt Securities Available-for-sale, Amortized Cost 5 6
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 6
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 20,703 20,065
Debt Securities Available-for-sale, Gross Unrealized Gains 8 40
Debt Securities Available-for-sale, Gross Unrealized Losses (825) (277)
Debt Securities Available-for-sale, Fair Value 19,886 19,828
Debt Securities Held-to-maturity, Amortized Cost 3,525 3,853
Debt Securities Held-to-maturity, Gross Unrealized Gain 0 7
Debt Securities Held-to-maturity, Gross Unrealized Losses (177) (46)
Debt Securities held-to-maturity, Fair Value 3,348 3,814
Other/non-agency    
Schedule of Available-for-sale and Held-to-maturity Securities [Line Items]    
Debt Securities Available-for-sale, Amortized Cost 251 311
Debt Securities Available-for-sale, Gross Unrealized Gains 4 7
Debt Securities Available-for-sale, Gross Unrealized Losses (6) (7)
Debt Securities Available-for-sale, Fair Value 249 311
Debt Securities Held-to-maturity, Amortized Cost 759 832
Debt Securities Held-to-maturity, Gross Unrealized Gain 1 22
Debt Securities Held-to-maturity, Gross Unrealized Losses (6) 0
Debt Securities held-to-maturity, Fair Value 754 854
Total mortgage-backed securities    
Schedule of Available-for-sale and Held-to-maturity Securities [Line Items]    
Debt Securities Available-for-sale, Amortized Cost 20,954 20,376
Debt Securities Available-for-sale, Gross Unrealized Gains 12 47
Debt Securities Available-for-sale, Gross Unrealized Losses (831) (284)
Debt Securities Available-for-sale, Fair Value 20,135 20,139
Debt Securities Held-to-maturity, Amortized Cost 4,284 4,685
Debt Securities Held-to-maturity, Gross Unrealized Gain 1 29
Debt Securities Held-to-maturity, Gross Unrealized Losses (183) (46)
Debt Securities held-to-maturity, Fair Value 4,102 4,668
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 20,971 20,394
Debt Securities Available-for-sale, Gross Unrealized Gains 12 47
Debt Securities Available-for-sale, Gross Unrealized Losses (831) (284)
Debt Securities Available-for-sale, Fair Value 20,152 20,157
Other investments    
Schedule of Available-for-sale and Held-to-maturity Securities [Line Items]    
Other Investments, Amortized Cost 0 4
Other Investments, Gross Unrealized Gain 0 0
Other Investments, Gross Unrealized Loss 0 0
Other Investments, Fair Value 0 4
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, Gross Unrealized Gains 0 0
Federal Reserve Bank stock, Gross Unrealized Losses 0 0
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 404 252
Federal Home Loan Bank stock, Gross Unrealized Gain 0 0
Federal Home Loan Bank stock, Gross Unrealized Losses 0 0
Federal Home Loan Bank stock, Fair Value $ 404 $ 252
[1] Includes only collateral pledged by the Company where counterparties have the right to sell or pledge the collateral.