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Investment Securities (Schedule of Unrealized Loss on Investments) (Details) - USD ($)
Dec. 31, 2022
Dec. 31, 2021
Less than 12 months    
Fair value $ 12,548,000,000 $ 21,288,000,000
Unrealized loss (1,503,000,000) (373,000,000)
12 months or longer    
Fair value 16,660,000,000 896,000,000
Unrealized loss (3,824,000,000) (48,000,000)
Hedged liability, fair value hedge, cumulative increase (decrease) (12,000,000)  
Hedged asset, fair value hedge, cumulative increase (decrease) 15,000,000  
Credit reserves 0 0
U.S. Treasury and federal agencies    
Less than 12 months    
Fair value 529,000,000 1,682,000,000
Unrealized loss (68,000,000) (20,000,000)
12 months or longer    
Fair value 1,487,000,000 0
Unrealized loss (188,000,000) 0
U.S. States and political subdivisions    
Less than 12 months    
Fair value 547,000,000 160,000,000
Unrealized loss (55,000,000) (3,000,000)
12 months or longer    
Fair value 135,000,000 31,000,000
Unrealized loss (27,000,000) (1,000,000)
Foreign government    
Less than 12 months    
Fair value 75,000,000 76,000,000
Unrealized loss (4,000,000) (2,000,000)
12 months or longer    
Fair value 71,000,000 7,000,000
Unrealized loss (8,000,000) 0
Agency mortgage-backed security    
Less than 12 months    
Fair value 7,472,000,000 12,244,000,000
Unrealized loss (892,000,000) (223,000,000)
12 months or longer    
Fair value 8,978,000,000 38,000,000
Unrealized loss (2,146,000,000) (1,000,000)
Mortgage-backed residential    
Less than 12 months    
Fair value 1,985,000,000 3,243,000,000
Unrealized loss (289,000,000) (34,000,000)
12 months or longer    
Fair value 2,287,000,000 22,000,000
Unrealized loss (566,000,000) 0
Agency mortgage-backed commercial    
Less than 12 months    
Fair value 996,000,000 2,553,000,000
Unrealized loss (124,000,000) (70,000,000)
12 months or longer    
Fair value 2,535,000,000 749,000,000
Unrealized loss (721,000,000) (43,000,000)
Asset-backed    
Less than 12 months    
Fair value 162,000,000 360,000,000
Unrealized loss (4,000,000) (3,000,000)
12 months or longer    
Fair value 272,000,000 0
Unrealized loss (22,000,000) 0
Corporate debt    
Less than 12 months    
Fair value 782,000,000 970,000,000
Unrealized loss (67,000,000) (18,000,000)
12 months or longer    
Fair value 895,000,000 49,000,000
Unrealized loss $ (146,000,000) $ (3,000,000)