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SECURITIES - Schedule of Investments (Details) - USD ($)
$ in Millions
Jun. 30, 2021
Dec. 31, 2020
Schedule of Available-for-sale and Held-to-maturity Securities [Line Items]    
Debt Securities Available-for-sale, Fair Value [1] $ 24,583 $ 22,942
Debt Securities Held-to-maturity, Amortized Cost [1] 2,711 3,235
Debt Securities Held-to-maturity, Gross Unrealized Gain 79 122
Debt Securities Held-to-maturity, Gross Unrealized Losses 0 0
Debt Securities held-to-maturity, Fair Value 2,790 3,357
Total equity securities, at cost, Amortized Cost 602 604
Equity securities, at cost, fair value 602 604
Equity Securities, Amortized Cost 80 66
Equity Securities, Fair Value 80 66
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 11
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 11
State and political subdivisions    
Schedule of Available-for-sale and Held-to-maturity Securities [Line Items]    
Debt Securities Available-for-sale, Amortized Cost 3 3
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 3 3
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 23,960 21,954
Debt Securities Available-for-sale, Gross Unrealized Gains 354 571
Debt Securities Available-for-sale, Gross Unrealized Losses (202) (19)
Debt Securities Available-for-sale, Fair Value 24,112 22,506
Debt Securities Held-to-maturity, Amortized Cost 1,887 2,342
Debt Securities Held-to-maturity, Gross Unrealized Gain 77 122
Debt Securities Held-to-maturity, Gross Unrealized Losses 0 0
Debt Securities held-to-maturity, Fair Value 1,964 2,464
Other/non-agency    
Schedule of Available-for-sale and Held-to-maturity Securities [Line Items]    
Debt Securities Available-for-sale, Amortized Cost 267 396
Debt Securities Available-for-sale, Gross Unrealized Gains 13 26
Debt Securities Available-for-sale, Gross Unrealized Losses 0 0
Debt Securities Available-for-sale, Fair Value 280 422
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 24,227 22,350
Debt Securities Available-for-sale, Gross Unrealized Gains 367 597
Debt Securities Available-for-sale, Gross Unrealized Losses (202) (19)
Debt Securities Available-for-sale, Fair Value 24,392 22,928
Debt Securities Held-to-maturity, Amortized Cost 1,887 2,342
Debt Securities Held-to-maturity, Gross Unrealized Gain 77 122
Debt Securities Held-to-maturity, Gross Unrealized Losses 0 0
Debt Securities held-to-maturity, Fair Value 1,964 2,464
Collateralized loan obligations, at fair value    
Schedule of Available-for-sale and Held-to-maturity Securities [Line Items]    
Debt Securities Available-for-sale, Amortized Cost 177 0
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 177 0
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 24,418 22,364
Debt Securities Available-for-sale, Gross Unrealized Gains 367 597
Debt Securities Available-for-sale, Gross Unrealized Losses (202) (19)
Debt Securities Available-for-sale, Fair Value 24,583 22,942
Asset-backed securities    
Schedule of Available-for-sale and Held-to-maturity Securities [Line Items]    
Debt Securities Held-to-maturity, Amortized Cost 824 893
Debt Securities Held-to-maturity, Gross Unrealized Gain 2 0
Debt Securities Held-to-maturity, Gross Unrealized Losses 0 0
Debt Securities held-to-maturity, Fair Value $ 826 $ 893
[1] Includes only collateral pledged by the Company where counterparties have the right to sell or pledge the collateral.