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SECURITIES - Schedule of Investments (Details) - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Schedule of Available-for-sale and Held-to-maturity Securities [Line Items]    
Debt Securities Available-for-Sale, Amortized Cost $ 20,476 $ 20,394
Debt Securities Available-for-Sale, Gross Unrealized Gains 31 47
Debt Securities Available-for-Sale, Gross Unrealized Losses (612) (284)
Debt securities available for sale: [1] 19,895 20,157
Debt Securities Held-to-Maturity, Amortized Cost 4,165 4,685
Debt Securities Held-to-Maturity, Gross Unrealized Gain 8 29
Debt Securities Held-to-Maturity, Gross Unrealized Losses (132) (46)
Debt Securities Held-to-Maturity, Fair Value 4,041 4,668
Equity Securities, at Fair Value, Amortized Cost 181 169
Equity Securities, at Fair Value, Fair Value 181 169
Other equity securities, Amortized Cost 7 7
Other equity securities, Fair Value 7 7
Total equity securities, at cost, Amortized Cost 834 722
Total equity securities, at cost, Fair Value 834 722
U.S. Treasury and other    
Schedule of Available-for-sale and Held-to-maturity Securities [Line Items]    
Debt Securities Available-for-Sale, Amortized Cost 24 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: 24 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: 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 20,211 20,065
Debt Securities Available-for-Sale, Gross Unrealized Gains 28 40
Debt Securities Available-for-Sale, Gross Unrealized Losses (605) (277)
Debt securities available for sale: 19,634 19,828
Debt Securities Held-to-Maturity, Amortized Cost 3,425 3,853
Debt Securities Held-to-Maturity, Gross Unrealized Gain 0 7
Debt Securities Held-to-Maturity, Gross Unrealized Losses (132) (46)
Debt Securities Held-to-Maturity, Fair Value 3,293 3,814
Other/non-agency    
Schedule of Available-for-sale and Held-to-maturity Securities [Line Items]    
Debt Securities Available-for-Sale, Amortized Cost 236 311
Debt Securities Available-for-Sale, Gross Unrealized Gains 3 7
Debt Securities Available-for-Sale, Gross Unrealized Losses (7) (7)
Debt securities available for sale: 232 311
Debt Securities Held-to-Maturity, Amortized Cost 740 832
Debt Securities Held-to-Maturity, Gross Unrealized Gain 8 22
Debt Securities Held-to-Maturity, Gross Unrealized Losses 0 0
Debt Securities Held-to-Maturity, Fair Value 748 854
Total mortgage-backed securities    
Schedule of Available-for-sale and Held-to-maturity Securities [Line Items]    
Debt Securities Available-for-Sale, Amortized Cost 20,447 20,376
Debt Securities Available-for-Sale, Gross Unrealized Gains 31 47
Debt Securities Available-for-Sale, Gross Unrealized Losses (612) (284)
Debt securities available for sale: 19,866 20,139
Debt Securities Held-to-Maturity, Amortized Cost 4,165 4,685
Debt Securities Held-to-Maturity, Gross Unrealized Gain 8 29
Debt Securities Held-to-Maturity, Gross Unrealized Losses (132) (46)
Debt Securities Held-to-Maturity, Fair Value 4,041 4,668
Money market mutual fund investments    
Schedule of Available-for-sale and Held-to-maturity Securities [Line Items]    
Equity Securities, at Fair Value, Amortized Cost 181 165
Equity Securities, at Fair Value, Fair Value 181 165
Other investments    
Schedule of Available-for-sale and Held-to-maturity Securities [Line Items]    
Equity Securities, at Fair Value, Amortized Cost 0 4
Equity Securities, at Fair Value, 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, 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 364 252
Federal Home Loan Bank stock, Fair Value $ 364 $ 252
[1] Includes only collateral pledged by the Company where counterparties have the right to sell or pledge the collateral.