Annual report pursuant to Section 13 and 15(d)

INVESTMENT SECURITIES AND OTHER SECURITIES - Continuous Unrealized Loss Position (Details)

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INVESTMENT SECURITIES AND OTHER SECURITIES - Continuous Unrealized Loss Position (Details) - USD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Investment securities and other securities disclosure [Line Items]    
Available-for-sale securities, Less than 12 Months, Fair Value $ 20,747 $ 2,432
Debt Securities, Available-for-sale securities, Less than 12 Months, Gross Unrealized Losses (304) (22)
Available-for-sale securities, Over 12 Months, Fair Value 319 490
Available-for-sale securities, Over 12 Months, Gross Unrealized Losses (11) (12)
Available-for-sale securities, Fair Value 21,066 2,922
Available-for-sale securities, Gross Unrealized Losses (315) (34)
Held-to-maturity securities, Less than 12 Months, Fair Value 7,608  
Held-to-maturity securities, Less than 12 Months, Gross Unrealized Losses (84)  
Held-to-maturity securities, Over 12 Months, Fair Value 0  
Held-to-maturity securities, Over 12 Months, Gross Unrealized Losses 0  
Held-to-maturity securities, Fair Value 7,608  
Held-to-maturity securities, Gross Unrealized Losses (84)  
Residential CMO    
Investment securities and other securities disclosure [Line Items]    
Available-for-sale securities, Less than 12 Months, Fair Value 2,925 302
Debt Securities, Available-for-sale securities, Less than 12 Months, Gross Unrealized Losses (40) (5)
Available-for-sale securities, Over 12 Months, Fair Value 0 0
Available-for-sale securities, Over 12 Months, Gross Unrealized Losses 0 0
Available-for-sale securities, Fair Value 2,925 302
Available-for-sale securities, Gross Unrealized Losses (40) (5)
Held-to-maturity securities, Less than 12 Months, Fair Value 1,453  
Held-to-maturity securities, Less than 12 Months, Gross Unrealized Losses (20)  
Held-to-maturity securities, Over 12 Months, Fair Value 0  
Held-to-maturity securities, Over 12 Months, Gross Unrealized Losses 0  
Held-to-maturity securities, Fair Value 1,453  
Held-to-maturity securities, Gross Unrealized Losses (20)  
Residential MBS    
Investment securities and other securities disclosure [Line Items]    
Available-for-sale securities, Less than 12 Months, Fair Value 13,491 1,633
Debt Securities, Available-for-sale securities, Less than 12 Months, Gross Unrealized Losses (160) (5)
Available-for-sale securities, Over 12 Months, Fair Value 0 0
Available-for-sale securities, Over 12 Months, Gross Unrealized Losses 0 0
Available-for-sale securities, Fair Value 13,491 1,633
Available-for-sale securities, Gross Unrealized Losses (160) (5)
Held-to-maturity securities, Less than 12 Months, Fair Value 5,837  
Held-to-maturity securities, Less than 12 Months, Gross Unrealized Losses (59)  
Held-to-maturity securities, Over 12 Months, Fair Value 0  
Held-to-maturity securities, Over 12 Months, Gross Unrealized Losses 0  
Held-to-maturity securities, Fair Value 5,837  
Held-to-maturity securities, Gross Unrealized Losses (59)  
Commercial MBS    
Investment securities and other securities disclosure [Line Items]    
Available-for-sale securities, Less than 12 Months, Fair Value 1,251 321
Debt Securities, Available-for-sale securities, Less than 12 Months, Gross Unrealized Losses (38) (9)
Available-for-sale securities, Over 12 Months, Fair Value 0 0
Available-for-sale securities, Over 12 Months, Gross Unrealized Losses 0 0
Available-for-sale securities, Fair Value 1,251 321
Available-for-sale securities, Gross Unrealized Losses (38) (9)
Held-to-maturity securities, Less than 12 Months, Fair Value 318  
Held-to-maturity securities, Less than 12 Months, Gross Unrealized Losses (5)  
Held-to-maturity securities, Over 12 Months, Fair Value 0  
Held-to-maturity securities, Over 12 Months, Gross Unrealized Losses 0  
Held-to-maturity securities, Fair Value 318  
Held-to-maturity securities, Gross Unrealized Losses (5)  
Other agencies    
Investment securities and other securities disclosure [Line Items]    
Available-for-sale securities, Less than 12 Months, Fair Value 140  
Debt Securities, Available-for-sale securities, Less than 12 Months, Gross Unrealized Losses (1)  
Available-for-sale securities, Over 12 Months, Fair Value 0  
Available-for-sale securities, Over 12 Months, Gross Unrealized Losses 0  
Available-for-sale securities, Fair Value 140  
Available-for-sale securities, Gross Unrealized Losses (1)  
Total U.S. Treasury, federal agency and other agency securities    
Investment securities and other securities disclosure [Line Items]    
Available-for-sale securities, Less than 12 Months, Fair Value 17,807 2,256
Debt Securities, Available-for-sale securities, Less than 12 Months, Gross Unrealized Losses (239) (19)
Available-for-sale securities, Over 12 Months, Fair Value 0 0
Available-for-sale securities, Over 12 Months, Gross Unrealized Losses 0 0
Available-for-sale securities, Fair Value 17,807 2,256
Available-for-sale securities, Gross Unrealized Losses (239) (19)
Held-to-maturity securities, Less than 12 Months, Fair Value 7,608  
Held-to-maturity securities, Less than 12 Months, Gross Unrealized Losses (84)  
Held-to-maturity securities, Over 12 Months, Fair Value 0  
Held-to-maturity securities, Over 12 Months, Gross Unrealized Losses 0  
Held-to-maturity securities, Fair Value 7,608  
Held-to-maturity securities, Gross Unrealized Losses (84)  
Municipal securities    
Investment securities and other securities disclosure [Line Items]    
Available-for-sale securities, Less than 12 Months, Fair Value 859 110
Debt Securities, Available-for-sale securities, Less than 12 Months, Gross Unrealized Losses (22) (3)
Available-for-sale securities, Over 12 Months, Fair Value 319 490
Available-for-sale securities, Over 12 Months, Gross Unrealized Losses (11) (12)
Available-for-sale securities, Fair Value 1,178 600
Available-for-sale securities, Gross Unrealized Losses (33) (15)
Private-label CMO    
Investment securities and other securities disclosure [Line Items]    
Available-for-sale securities, Less than 12 Months, Fair Value 78  
Debt Securities, Available-for-sale securities, Less than 12 Months, Gross Unrealized Losses (1)  
Available-for-sale securities, Over 12 Months, Fair Value 0  
Available-for-sale securities, Over 12 Months, Gross Unrealized Losses 0  
Available-for-sale securities, Fair Value 78  
Available-for-sale securities, Gross Unrealized Losses (1)  
Asset-backed Securities    
Investment securities and other securities disclosure [Line Items]    
Available-for-sale securities, Less than 12 Months, Fair Value 237 15
Debt Securities, Available-for-sale securities, Less than 12 Months, Gross Unrealized Losses (4) 0
Available-for-sale securities, Over 12 Months, Fair Value 0 0
Available-for-sale securities, Over 12 Months, Gross Unrealized Losses 0 0
Available-for-sale securities, Fair Value 237 15
Available-for-sale securities, Gross Unrealized Losses (4) 0
Corporate debt    
Investment securities and other securities disclosure [Line Items]    
Available-for-sale securities, Less than 12 Months, Fair Value 1,766 51
Debt Securities, Available-for-sale securities, Less than 12 Months, Gross Unrealized Losses (38) 0
Available-for-sale securities, Over 12 Months, Fair Value 0 0
Available-for-sale securities, Over 12 Months, Gross Unrealized Losses 0 0
Available-for-sale securities, Fair Value 1,766 51
Available-for-sale securities, Gross Unrealized Losses $ (38) $ 0