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Investment Securities (Summary) (Details) - USD ($)
$ in Millions
6 Months Ended 12 Months Ended
Jun. 30, 2023
Dec. 31, 2022
Debt Securities, Available-for-sale and Held-to-maturity [Abstract]    
Securities available for sale debt securities, amortized cost $ 46,017.0 $ 48,568.0
Securities available for sale debt securities, unrealized gains 214.0 225.0
Securities available for sale debt securities, unrealized losses (4,444.0) (4,634.0)
Securities available for sale debt securities, fair value 41,787.0 44,159.0
Held to maturity securities, amortized cost 93,874.0 95,175.0
Held-to-maturity securities, unrealized gains 98.0 115.0
Held-to-maturity securities, unrealized losses (5,076.0) (5,011.0)
Held-to-maturity securities, fair value 88,896.0 90,279.0
Accrued interest, held-to-maturity 288.0 282.0
Accrued interest, available-for-sale 143.0 $ 144.0
Net unrealized losses, related to securities transferred at fair value to held to maturity at a point in time $ 4,700.0  
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 $ 7,863.0 $ 9,196.0
Securities available for sale debt securities, unrealized gains 7.0 10.0
Securities available for sale debt securities, unrealized losses (760.0) (836.0)
Securities available for sale debt securities, fair value 7,110.0 8,370.0
Held to maturity securities, amortized cost 36,985.0 36,571.0
Held-to-maturity securities, unrealized gains 3.0 6.0
Held-to-maturity securities, unrealized losses (1,695.0) (1,617.0)
Held-to-maturity securities, fair value 35,293.0 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 30,867.0 32,114.0
Securities available for sale debt securities, unrealized gains 6.0 13.0
Securities available for sale debt securities, unrealized losses (3,218.0) (3,304.0)
Securities available for sale debt securities, fair value 27,655.0 28,823.0
Held to maturity securities, amortized cost 44,278.0 45,271.0
Held-to-maturity securities, unrealized gains 60.0 74.0
Held-to-maturity securities, unrealized losses (3,119.0) (3,095.0)
Held-to-maturity securities, fair value 41,219.0 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 642.0 697.0
Securities available for sale debt securities, unrealized gains 133.0 131.0
Securities available for sale debt securities, unrealized losses (7.0) (9.0)
Securities available for sale debt securities, fair value 768.0 819.0
Held to maturity securities, amortized cost 269.0 276.0
Held-to-maturity securities, unrealized gains
Held-to-maturity securities, unrealized losses (22.0) (21.0)
Held-to-maturity securities, fair value 247.0 255.0
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 1,759.0 1,845.0
Securities available for sale debt securities, unrealized gains 1.0
Securities available for sale debt securities, unrealized losses (167.0) (170.0)
Securities available for sale debt securities, fair value 1,593.0 1,675.0
Held to maturity securities, amortized cost 839.0 848.0
Held-to-maturity securities, unrealized gains 3.0 4.0
Held-to-maturity securities, unrealized losses (30.0) (26.0)
Held-to-maturity securities, fair value 812.0 826.0
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 1,014.0 1,325.0
Securities available for sale debt securities, unrealized gains
Securities available for sale debt securities, unrealized losses (67.0) (69.0)
Securities available for sale debt securities, fair value 947.0 1,256.0
Held to maturity securities, amortized cost 1,549.0 1,667.0
Held-to-maturity securities, unrealized gains
Held-to-maturity securities, unrealized losses (38.0) (40.0)
Held-to-maturity securities, fair value 1,511.0 1,627.0
Debt securities, available for sale, amortized cost 141.0 142.0
Debt securities, held to maturity, amortized cost 7.0 7.0
Asset-backed    
Debt Securities, Available-for-sale and Held-to-maturity [Abstract]    
Securities available for sale debt securities, amortized cost 910.0 103.0
Securities available for sale debt securities, unrealized gains 28.0 27.0
Securities available for sale debt securities, unrealized losses (4.0) (1.0)
Securities available for sale debt securities, fair value 934.0 129.0
Held to maturity securities, amortized cost 6,645.0 7,188.0
Held-to-maturity securities, unrealized gains 5.0 6.0
Held-to-maturity securities, unrealized losses (112.0) (140.0)
Held-to-maturity securities, fair value 6,538.0 7,054.0
Other    
Debt Securities, Available-for-sale and Held-to-maturity [Abstract]    
Securities available for sale debt securities, amortized cost 2,962.0 3,288.0
Securities available for sale debt securities, unrealized gains 39.0 44.0
Securities available for sale debt securities, unrealized losses (221.0) (245.0)
Securities available for sale debt securities, fair value 2,780.0 3,087.0
Held to maturity securities, amortized cost 3,309.0 3,354.0
Held-to-maturity securities, unrealized gains 27.0 25.0
Held-to-maturity securities, unrealized losses (60.0) (72.0)
Held-to-maturity securities, fair value $ 3,276.0 $ 3,307.0