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Investment Securities (Summary) (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Mar. 31, 2023
Dec. 31, 2022
Debt Securities, Available-for-sale and Held-to-maturity [Abstract]    
Securities available for sale debt securities, amortized cost $ 46,977.0 $ 48,568.0
Securities available for sale debt securities, unrealized gains 231.0 225.0
Securities available for sale debt securities, unrealized losses (3,988.0) (4,634.0)
Securities available for sale debt securities, fair value 43,220.0 44,159.0
Held to maturity securities, amortized cost 95,019.0 95,175.0
Held-to-maturity securities, unrealized gains 229.0 115.0
Held-to-maturity securities, unrealized losses (3,823.0) (5,011.0)
Held-to-maturity securities, fair value 91,425.0 90,279.0
Accrued interest, held-to-maturity 257.0 282.0
Accrued interest, available-for-sale 135.0 $ 144.0
Net unrealized losses, related to securities transferred at fair value to held to maturity at a point in time $ 4,900.0  
Fitch, AAA OR AA Rating | Credit Concentration Risk | Investments    
Debt Securities, Available-for-sale and Held-to-maturity [Abstract]    
Concentration risk, percentage 97.00% 97.00%
U.S. Treasury and government agencies    
Debt Securities, Available-for-sale and Held-to-maturity [Abstract]    
Securities available for sale debt securities, amortized cost $ 8,453.0 $ 9,196.0
Securities available for sale debt securities, unrealized gains 14.0 10.0
Securities available for sale debt securities, unrealized losses (720.0) (836.0)
Securities available for sale debt securities, fair value 7,747.0 8,370.0
Held to maturity securities, amortized cost 36,838.0 36,571.0
Held-to-maturity securities, unrealized gains 32.0 6.0
Held-to-maturity securities, unrealized losses (1,162.0) (1,617.0)
Held-to-maturity securities, fair value 35,708.0 34,960.0
Residential mortgage-backed | Mortgage-backed Securities Agency    
Debt Securities, Available-for-sale and Held-to-maturity [Abstract]    
Securities available for sale debt securities, amortized cost 31,510.0 32,114.0
Securities available for sale debt securities, unrealized gains 25.0 13.0
Securities available for sale debt securities, unrealized losses (2,840.0) (3,304.0)
Securities available for sale debt securities, fair value 28,695.0 28,823.0
Held to maturity securities, amortized cost 45,191.0 45,271.0
Held-to-maturity securities, unrealized gains 134.0 74.0
Held-to-maturity securities, unrealized losses (2,455.0) (3,095.0)
Held-to-maturity securities, fair value 42,870.0 42,250.0
Residential mortgage-backed | Mortgage-backed Securities Non-agency    
Debt Securities, Available-for-sale and Held-to-maturity [Abstract]    
Securities available for sale debt securities, amortized cost 675.0 697.0
Securities available for sale debt securities, unrealized gains 123.0 131.0
Securities available for sale debt securities, unrealized losses (11.0) (9.0)
Securities available for sale debt securities, fair value 787.0 819.0
Held to maturity securities, amortized cost 272.0 276.0
Held-to-maturity securities, unrealized gains
Held-to-maturity securities, unrealized losses (19.0) (21.0)
Held-to-maturity securities, fair value 253.0 255.0
Commercial mortgage-backed | Mortgage-backed Securities Agency    
Debt Securities, Available-for-sale and Held-to-maturity [Abstract]    
Securities available for sale debt securities, amortized cost 1,852.0 1,845.0
Securities available for sale debt securities, unrealized gains 1.0
Securities available for sale debt securities, unrealized losses (148.0) (170.0)
Securities available for sale debt securities, fair value 1,705.0 1,675.0
Held to maturity securities, amortized cost 822.0 848.0
Held-to-maturity securities, unrealized gains 10.0 4.0
Held-to-maturity securities, unrealized losses (19.0) (26.0)
Held-to-maturity securities, fair value 813.0 826.0
Commercial mortgage-backed | Mortgage-backed Securities Non-agency    
Debt Securities, Available-for-sale and Held-to-maturity [Abstract]    
Securities available for sale debt securities, amortized cost 1,020.0 1,325.0
Securities available for sale debt securities, unrealized gains
Securities available for sale debt securities, unrealized losses (65.0) (69.0)
Securities available for sale debt securities, fair value 955.0 1,256.0
Held to maturity securities, amortized cost 1,604.0 1,667.0
Held-to-maturity securities, unrealized gains 1.0
Held-to-maturity securities, unrealized losses (31.0) (40.0)
Held-to-maturity securities, fair value 1,574.0 1,627.0
Debt securities, available for sale, amortized cost 142.0 142.0
Debt securities, held to maturity, amortized cost 6.0 7.0
Asset-backed    
Debt Securities, Available-for-sale and Held-to-maturity [Abstract]    
Securities available for sale debt securities, amortized cost 393.0 103.0
Securities available for sale debt securities, unrealized gains 28.0 27.0
Securities available for sale debt securities, unrealized losses (2.0) (1.0)
Securities available for sale debt securities, fair value 419.0 129.0
Held to maturity securities, amortized cost 6,884.0 7,188.0
Held-to-maturity securities, unrealized gains 13.0 6.0
Held-to-maturity securities, unrealized losses (97.0) (140.0)
Held-to-maturity securities, fair value 6,800.0 7,054.0
Other    
Debt Securities, Available-for-sale and Held-to-maturity [Abstract]    
Securities available for sale debt securities, amortized cost 3,074.0 3,288.0
Securities available for sale debt securities, unrealized gains 40.0 44.0
Securities available for sale debt securities, unrealized losses (202.0) (245.0)
Securities available for sale debt securities, fair value 2,912.0 3,087.0
Held to maturity securities, amortized cost 3,408.0 3,354.0
Held-to-maturity securities, unrealized gains 39.0 25.0
Held-to-maturity securities, unrealized losses (40.0) (72.0)
Held-to-maturity securities, fair value $ 3,407.0 $ 3,307.0