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SECURITIES - Schedule of Investments (Details) - USD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Schedule of Available-for-sale and Held-to-maturity Securities [Line Items]    
Debt Securities Available-for-Sale, Amortized Cost $ 26,225 $ 22,364
Debt Securities Available-for-Sale, Gross Unrealized Gains 219 597
Debt Securities Available-for-Sale, Gross Unrealized Losses (377) (19)
Debt securities available for sale: [1] 26,067 22,942
Debt Securities Held-to-Maturity, Amortized Cost [1] 2,242 3,235
Debt Securities Held-to-Maturity, Gross Unrealized Gain 54 122
Debt Securities Held-to-Maturity, Gross Unrealized Losses (7) 0
Debt Securities Held-to-Maturity, Fair Value 2,289 3,357
Equity securities, at fair value, Amortized Cost 109 66
Equity securities, at fair value, Fair Value 109 66
Other investment securities, at cost, carrying value 624 604
Other investment securities, at cost, estimated fair value 624 604
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: 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 2 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: 2 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 24,607 21,954
Debt Securities Available-for-Sale, Gross Unrealized Gains 210 571
Debt Securities Available-for-Sale, Gross Unrealized Losses (375) (19)
Debt securities available for sale: 24,442 22,506
Debt Securities Held-to-Maturity, Amortized Cost 1,505 2,342
Debt Securities Held-to-Maturity, Gross Unrealized Gain 52 122
Debt Securities Held-to-Maturity, Gross Unrealized Losses 0 0
Debt Securities Held-to-Maturity, Fair Value 1,557 2,464
Other/non-agency    
Schedule of Available-for-sale and Held-to-maturity Securities [Line Items]    
Debt Securities Available-for-Sale, Amortized Cost 397 396
Debt Securities Available-for-Sale, Gross Unrealized Gains 9 26
Debt Securities Available-for-Sale, Gross Unrealized Losses (1) 0
Debt securities available for sale: 405 422
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 25,004 22,350
Debt Securities Available-for-Sale, Gross Unrealized Gains 219 597
Debt Securities Available-for-Sale, Gross Unrealized Losses (376) (19)
Debt securities available for sale: 24,847 22,928
Debt Securities Held-to-Maturity, Amortized Cost 1,505 2,342
Debt Securities Held-to-Maturity, Gross Unrealized Gain 52 122
Debt Securities Held-to-Maturity, Gross Unrealized Losses 0 0
Debt Securities Held-to-Maturity, Fair Value 1,557 2,464
Collateralized loan obligations    
Schedule of Available-for-sale and Held-to-maturity Securities [Line Items]    
Debt Securities Available-for-Sale, Amortized Cost 1,208 0
Debt Securities Available-for-Sale, Gross Unrealized Gains 0 0
Debt Securities Available-for-Sale, Gross Unrealized Losses (1) 0
Debt securities available for sale: 1,207 0
Asset-backed securities    
Schedule of Available-for-sale and Held-to-maturity Securities [Line Items]    
Debt Securities Held-to-Maturity, Amortized Cost 737 893
Debt Securities Held-to-Maturity, Gross Unrealized Gain 2 0
Debt Securities Held-to-Maturity, Gross Unrealized Losses (7) 0
Debt Securities Held-to-Maturity, Fair Value $ 732 $ 893
[1] Includes only collateral pledged by the Company where counterparties have the right to sell or pledge the collateral.