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Investment Securities (Summary) (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Mar. 31, 2024
Dec. 31, 2023
Debt Securities, Available-for-sale and Held-to-maturity [Abstract]    
Securities available for sale debt securities, amortized cost $ 46,244.0 $ 45,353.0
Securities available for sale debt securities, unrealized gains 220.0 257.0
Securities available for sale debt securities, unrealized losses (4,184.0) (3,825.0)
Securities available for sale debt securities, fair value 42,280.0 41,785.0
Held to maturity securities, amortized cost 88,180.0 90,784.0
Held-to-maturity securities, unrealized gains 84.0 179.0
Held-to-maturity securities, unrealized losses (4,963.0) (4,015.0)
Held-to-maturity securities, fair value 83,301.0 86,948.0
Accrued interest, held-to-maturity 244.0 281.0
Accrued interest, available-for-sale 140.0 144.0
Debt securities, available for sale, amortized cost 87.0 86.0
Debt securities, held to maturity, amortized cost 6.0 6.0
Net unrealized losses, related to securities transferred at fair value to held to maturity at a point in time $ 4,000.0 $ 4,200.0
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 $ 8,516.0 $ 7,596.0
Securities available for sale debt securities, unrealized gains 14.0 22.0
Securities available for sale debt securities, unrealized losses (650.0) (667.0)
Securities available for sale debt securities, fair value 7,880.0 6,951.0
Held to maturity securities, amortized cost 35,469.0 36,529.0
Held-to-maturity securities, unrealized gains 1.0 9.0
Held-to-maturity securities, unrealized losses (1,342.0) (1,141.0)
Held-to-maturity securities, fair value 34,128.0 35,397.0
Agency    
Debt Securities, Available-for-sale and Held-to-maturity [Abstract]    
Securities available for sale debt securities, amortized cost 30,001.0 30,643.0
Securities available for sale debt securities, unrealized gains 24.0 46.0
Securities available for sale debt securities, unrealized losses (3,183.0) (2,809.0)
Securities available for sale debt securities, fair value 26,842.0 27,880.0
Held to maturity securities, amortized cost 41,970.0 42,686.0
Held-to-maturity securities, unrealized gains 28.0 92.0
Held-to-maturity securities, unrealized losses (3,470.0) (2,733.0)
Held-to-maturity securities, fair value 38,528.0 40,045.0
Non-agency    
Debt Securities, Available-for-sale and Held-to-maturity [Abstract]    
Securities available for sale debt securities, amortized cost 563.0 585.0
Securities available for sale debt securities, unrealized gains 113.0 118.0
Securities available for sale debt securities, unrealized losses (8.0) (7.0)
Securities available for sale debt securities, fair value 668.0 696.0
Held to maturity securities, amortized cost 256.0 259.0
Held-to-maturity securities, unrealized gains
Held-to-maturity securities, unrealized losses (21.0) (17.0)
Held-to-maturity securities, fair value 235.0 242.0
Agency    
Debt Securities, Available-for-sale and Held-to-maturity [Abstract]    
Securities available for sale debt securities, amortized cost 1,780.0 1,680.0
Securities available for sale debt securities, unrealized gains 1.0 1.0
Securities available for sale debt securities, unrealized losses (142.0) (135.0)
Securities available for sale debt securities, fair value 1,639.0 1,546.0
Held to maturity securities, amortized cost 946.0 939.0
Held-to-maturity securities, unrealized gains 4.0 9.0
Held-to-maturity securities, unrealized losses (29.0) (23.0)
Held-to-maturity securities, fair value 921.0 925.0
Non-agency    
Debt Securities, Available-for-sale and Held-to-maturity [Abstract]    
Securities available for sale debt securities, amortized cost 866.0 913.0
Securities available for sale debt securities, unrealized gains 1.0
Securities available for sale debt securities, unrealized losses (32.0) (45.0)
Securities available for sale debt securities, fair value 834.0 869.0
Held to maturity securities, amortized cost 1,259.0 1,373.0
Held-to-maturity securities, unrealized gains 1.0 2.0
Held-to-maturity securities, unrealized losses (20.0) (27.0)
Held-to-maturity securities, fair value 1,240.0 1,348.0
Asset-backed    
Debt Securities, Available-for-sale and Held-to-maturity [Abstract]    
Securities available for sale debt securities, amortized cost 1,804.0 1,092.0
Securities available for sale debt securities, unrealized gains 25.0 25.0
Securities available for sale debt securities, unrealized losses (2.0) (1.0)
Securities available for sale debt securities, fair value 1,827.0 1,116.0
Held to maturity securities, amortized cost 5,264.0 5,890.0
Held-to-maturity securities, unrealized gains 20.0 17.0
Held-to-maturity securities, unrealized losses (34.0) (39.0)
Held-to-maturity securities, fair value 5,250.0 5,868.0
Other    
Debt Securities, Available-for-sale and Held-to-maturity [Abstract]    
Securities available for sale debt securities, amortized cost 2,714.0 2,844.0
Securities available for sale debt securities, unrealized gains 43.0 44.0
Securities available for sale debt securities, unrealized losses (167.0) (161.0)
Securities available for sale debt securities, fair value 2,590.0 2,727.0
Held to maturity securities, amortized cost 3,016.0 3,108.0
Held-to-maturity securities, unrealized gains 30.0 50.0
Held-to-maturity securities, unrealized losses (47.0) (35.0)
Held-to-maturity securities, fair value $ 2,999.0 $ 3,123.0