Annual report pursuant to Section 13 and 15(d)

INVESTMENT SECURITIES AND OTHER SECURITIES - Schedule of Amortized Cost, Fair Value, and Gross Unrealized Gains (Losses) (Details)

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INVESTMENT SECURITIES AND OTHER SECURITIES - Schedule of Amortized Cost, Fair Value, and Gross Unrealized Gains (Losses) (Details) - USD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Schedule of investment securities and other securities [Line Items]    
Available-for-sale securities, Amortized Cost $ 28,506 $ 16,175
Available-for-sale securities, Gross Gains 269 344
Available-for-sale securities, Gross Losses (315) (34)
Available-for-sale securities, Fair Value 28,460 16,485
Held-to-maturity securities, Amortized Cost 12,447 8,861
Held-to-maturity securities, Gross Gains 126 394
Held-to-maturity securities, Gross Losses (84) 0
Held-to-maturity securities, Fair Value 12,489 9,255
Other securities, Amortized Cost 647 417
Other securities, Gross Gains 1 1
Other securities, Gross Losses 0 0
Other securities, Fair Value 648 418
Available-for-sale Securities    
Schedule of investment securities and other securities [Line Items]    
Accrued interest receivable 62 32
Held-to-maturity Securities    
Schedule of investment securities and other securities [Line Items]    
Accrued interest receivable 26 20
U.S. Treasury securities    
Schedule of investment securities and other securities [Line Items]    
Available-for-sale securities, Amortized Cost 5 5
Available-for-sale securities, Gross Gains 0 0
Available-for-sale securities, Gross Losses 0 0
Available-for-sale securities, Fair Value 5 5
Residential CMO    
Schedule of investment securities and other securities [Line Items]    
Available-for-sale securities, Amortized Cost 4,649 3,550
Available-for-sale securities, Gross Gains 40 121
Available-for-sale securities, Gross Losses (40) (5)
Available-for-sale securities, Fair Value 4,649 3,666
Held-to-maturity securities, Amortized Cost 2,602 1,779
Held-to-maturity securities, Gross Gains 35 88
Held-to-maturity securities, Gross Losses (20) 0
Held-to-maturity securities, Fair Value 2,617 1,867
Residential MBS    
Schedule of investment securities and other securities [Line Items]    
Available-for-sale securities, Amortized Cost 15,533 7,843
Available-for-sale securities, Gross Gains 135 97
Available-for-sale securities, Gross Losses (160) (5)
Available-for-sale securities, Fair Value 15,508 7,935
Held-to-maturity securities, Amortized Cost 7,475 3,715
Held-to-maturity securities, Gross Gains 41 103
Held-to-maturity securities, Gross Losses (59) 0
Held-to-maturity securities, Fair Value 7,457 3,818
Commercial MBS    
Schedule of investment securities and other securities [Line Items]    
Available-for-sale securities, Amortized Cost 1,896 1,151
Available-for-sale securities, Gross Gains 7 21
Available-for-sale securities, Gross Losses (38) (9)
Available-for-sale securities, Fair Value 1,865 1,163
Held-to-maturity securities, Amortized Cost 2,175 3,118
Held-to-maturity securities, Gross Gains 45 191
Held-to-maturity securities, Gross Losses (5) 0
Held-to-maturity securities, Fair Value 2,215 3,309
Other agencies    
Schedule of investment securities and other securities [Line Items]    
Available-for-sale securities, Amortized Cost 248 60
Available-for-sale securities, Gross Gains 1 2
Available-for-sale securities, Gross Losses (1) 0
Available-for-sale securities, Fair Value 248 62
Held-to-maturity securities, Amortized Cost 193 246
Held-to-maturity securities, Gross Gains 5 12
Held-to-maturity securities, Gross Losses 0 0
Held-to-maturity securities, Fair Value 198 258
Total U.S. Treasury, federal agency and other agency securities    
Schedule of investment securities and other securities [Line Items]    
Available-for-sale securities, Amortized Cost 22,331 12,609
Available-for-sale securities, Gross Gains 183 241
Available-for-sale securities, Gross Losses (239) (19)
Available-for-sale securities, Fair Value 22,275 12,831
Held-to-maturity securities, Amortized Cost 12,445 8,858
Held-to-maturity securities, Gross Gains 126 394
Held-to-maturity securities, Gross Losses (84) 0
Held-to-maturity securities, Fair Value 12,487 9,252
Municipal securities    
Schedule of investment securities and other securities [Line Items]    
Available-for-sale securities, Amortized Cost 3,497 2,928
Available-for-sale securities, Gross Gains 62 91
Available-for-sale securities, Gross Losses (33) (15)
Available-for-sale securities, Fair Value 3,526 3,004
Held-to-maturity securities, Amortized Cost 2 3
Held-to-maturity securities, Gross Gains 0 0
Held-to-maturity securities, Gross Losses 0 0
Held-to-maturity securities, Fair Value 2 3
Private-label CMO    
Schedule of investment securities and other securities [Line Items]    
Available-for-sale securities, Amortized Cost 106 9
Available-for-sale securities, Gross Gains 1 0
Available-for-sale securities, Gross Losses (1) 0
Available-for-sale securities, Fair Value 106 9
Asset-backed securities    
Schedule of investment securities and other securities [Line Items]    
Available-for-sale securities, Amortized Cost 385 185
Available-for-sale securities, Gross Gains 1 7
Available-for-sale securities, Gross Losses (4) 0
Available-for-sale securities, Fair Value 382 192
Corporate debt    
Schedule of investment securities and other securities [Line Items]    
Available-for-sale securities, Amortized Cost 2,183 440
Available-for-sale securities, Gross Gains 22 5
Available-for-sale securities, Gross Losses (38) 0
Available-for-sale securities, Fair Value 2,167 445
Other securities/Sovereign debt    
Schedule of investment securities and other securities [Line Items]    
Available-for-sale securities, Amortized Cost 4 4
Available-for-sale securities, Gross Gains 0 0
Available-for-sale securities, Gross Losses 0 0
Available-for-sale securities, Fair Value 4 4
Equity securities    
Schedule of investment securities and other securities [Line Items]    
Other securities, Amortized Cost 12  
Other securities, Gross Gains 0  
Other securities, Gross Losses 0  
Other securities, Fair Value 12  
Mutual funds    
Schedule of investment securities and other securities [Line Items]    
Other securities, Amortized Cost 65 50
Other securities, Gross Gains 0 0
Other securities, Gross Losses 0 0
Other securities, Fair Value 65 50
Equity securities    
Schedule of investment securities and other securities [Line Items]    
Other securities, Amortized Cost 6 8
Other securities, Gross Gains 1 1
Other securities, Gross Losses 0 0
Other securities, Fair Value 7 9
Federal Home Loan Bank stock | Non-marketable equity securities:    
Schedule of investment securities and other securities [Line Items]    
Other securities, Amortized Cost 52 60
Other securities, Gross Gains 0 0
Other securities, Gross Losses 0 0
Other securities, Fair Value 52 60
Federal Reserve Bank stock | Non-marketable equity securities:    
Schedule of investment securities and other securities [Line Items]    
Other securities, Amortized Cost 512 299
Other securities, Gross Gains 0 0
Other securities, Gross Losses 0 0
Other securities, Fair Value $ 512 $ 299