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SECURITIES - Schedule of Investments (Details) - USD ($)
$ in Millions
Mar. 31, 2023
Dec. 31, 2022
Schedule of Available-for-sale and Held-to-maturity Securities [Line Items]    
Debt securities available for sale [1] $ 23,845 $ 24,007
Debt Securities Held-to-maturity, Amortized Cost [1] 9,677 9,834
Debt Securities Held-to-maturity, Gross Unrealized Gain 16 4
Debt Securities Held-to-maturity, Gross Unrealized Losses (629) (796)
Debt Securities held-to-maturity, fair value 9,064 9,042
Total equity securities, at cost, Amortized Cost 1,228 1,058
Equity securities, at cost, fair value 1,228 1,058
Equity Securities, Amortized Cost 143 153
Equity Securities, Fair Value 143 153
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 25,865 26,458
Debt Securities Available-for-sale, Gross Unrealized Gains 20 11
Debt Securities Available-for-sale, Gross Unrealized Losses (2,040) (2,462)
Debt securities available for sale 23,845 24,007
U.S. Treasury and other    
Schedule of Available-for-sale and Held-to-maturity Securities [Line Items]    
Debt Securities, Available-for-Sale, Amortized Cost 3,378 3,678
Debt Securities Available-for-sale, Gross Unrealized Gains 0 1
Debt Securities Available-for-sale, Gross Unrealized Losses (126) (193)
Debt securities available for sale 3,252 3,486
State and political subdivisions    
Schedule of Available-for-sale and Held-to-maturity Securities [Line Items]    
Debt Securities, Available-for-Sale, Amortized Cost 2 2
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 2
Total mortgage-backed securities    
Schedule of Available-for-sale and Held-to-maturity Securities [Line Items]    
Debt Securities, Available-for-Sale, Amortized Cost 21,237 21,530
Debt Securities Available-for-sale, Gross Unrealized Gains 20 10
Debt Securities Available-for-sale, Gross Unrealized Losses (1,881) (2,227)
Debt securities available for sale 19,376 19,313
Debt Securities Held-to-maturity, Amortized Cost 9,125 9,253
Debt Securities Held-to-maturity, Gross Unrealized Gain 14 4
Debt Securities Held-to-maturity, Gross Unrealized Losses (599) (751)
Debt Securities held-to-maturity, fair value 8,540 8,506
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 20,957 21,250
Debt Securities Available-for-sale, Gross Unrealized Gains 20 10
Debt Securities Available-for-sale, Gross Unrealized Losses (1,852) (2,198)
Debt securities available for sale 19,125 19,062
Debt Securities Held-to-maturity, Amortized Cost 9,125 9,253
Debt Securities Held-to-maturity, Gross Unrealized Gain 14 4
Debt Securities Held-to-maturity, Gross Unrealized Losses (599) (751)
Debt Securities held-to-maturity, fair value 8,540 8,506
Other/non-agency    
Schedule of Available-for-sale and Held-to-maturity Securities [Line Items]    
Debt Securities, Available-for-Sale, Amortized Cost 280 280
Debt Securities Available-for-sale, Gross Unrealized Gains 0 0
Debt Securities Available-for-sale, Gross Unrealized Losses (29) (29)
Debt securities available for sale 251 251
Collateralized loan obligations    
Schedule of Available-for-sale and Held-to-maturity Securities [Line Items]    
Debt Securities, Available-for-Sale, Amortized Cost 1,248 1,248
Debt Securities Available-for-sale, Gross Unrealized Gains 0 0
Debt Securities Available-for-sale, Gross Unrealized Losses (33) (42)
Debt securities available for sale 1,215 1,206
Asset-backed securities    
Schedule of Available-for-sale and Held-to-maturity Securities [Line Items]    
Debt Securities Held-to-maturity, Amortized Cost 552 581
Debt Securities Held-to-maturity, Gross Unrealized Gain 2 0
Debt Securities Held-to-maturity, Gross Unrealized Losses (30) (45)
Debt Securities held-to-maturity, fair value $ 524 $ 536
[1] Includes only collateral pledged by the Company where counterparties have the right to sell or pledge the collateral.