v3.25.4
AFS and HTM Debt Securities, Gross Unrealized Losses and Fair Value (Details) - USD ($)
$ in Millions
Dec. 31, 2025
Dec. 31, 2024
Available-for-sale debt securities:    
Less than 12 months, Gross unrealized losses, available-for-sale $ (995) $ (1,554)
Less than 12 months, Fair value, available-for-sale 13,305 86,194
12 months or more, Gross unrealized losses, available-for-sale (2,996) (6,273)
12 months or more, Fair value, available-for-sale 50,012 57,136
Total, Gross unrealized losses, available-for-sale (3,991) (7,827)
Total Fair value, available for sale 63,317 143,330
Securities of U.S. Treasury and federal agencies [Member]    
Available-for-sale debt securities:    
Less than 12 months, Gross unrealized losses, available-for-sale 0 (77)
Less than 12 months, Fair value, available-for-sale 0 14,000
12 months or more, Gross unrealized losses, available-for-sale (237) (430)
12 months or more, Fair value, available-for-sale 6,119 7,778
Total, Gross unrealized losses, available-for-sale (237) (507)
Total Fair value, available for sale 6,119 21,778
Securities of U.S. states and political subdivisions [Member]    
Available-for-sale debt securities:    
Less than 12 months, Gross unrealized losses, available-for-sale (5) (11)
Less than 12 months, Fair value, available-for-sale 222 748
12 months or more, Gross unrealized losses, available-for-sale (338) (507)
12 months or more, Fair value, available-for-sale 5,701 7,215
Total, Gross unrealized losses, available-for-sale (343) (518)
Total Fair value, available for sale 5,923 7,963
Federal agency mortgage-backed securities [Member]    
Available-for-sale debt securities:    
Less than 12 months, Gross unrealized losses, available-for-sale (988) (1,465)
Less than 12 months, Fair value, available-for-sale 11,307 71,424
12 months or more, Gross unrealized losses, available-for-sale (2,401) (5,293)
12 months or more, Fair value, available-for-sale 37,377 40,722
Total, Gross unrealized losses, available-for-sale (3,389) (6,758)
Total Fair value, available for sale 48,684 112,146
Non-agency mortgage-backed securities [Member]    
Available-for-sale debt securities:    
Less than 12 months, Gross unrealized losses, available-for-sale 0 (1)
Less than 12 months, Fair value, available-for-sale 0 22
12 months or more, Gross unrealized losses, available-for-sale (18) (40)
12 months or more, Fair value, available-for-sale 744 1,307
Total, Gross unrealized losses, available-for-sale (18) (41)
Total Fair value, available for sale 744 1,329
Other debt securities [Member]    
Available-for-sale debt securities:    
Less than 12 months, Gross unrealized losses, available-for-sale 0 0
Less than 12 months, Fair value, available-for-sale 0 0
12 months or more, Gross unrealized losses, available-for-sale (2) (3)
12 months or more, Fair value, available-for-sale 71 114
Total, Gross unrealized losses, available-for-sale (2) (3)
Total Fair value, available for sale 71 $ 114
Collateralized loan obligations [Member]    
Available-for-sale debt securities:    
Less than 12 months, Gross unrealized losses, available-for-sale (2)  
Less than 12 months, Fair value, available-for-sale 1,776  
12 months or more, Gross unrealized losses, available-for-sale 0  
12 months or more, Fair value, available-for-sale 0  
Total, Gross unrealized losses, available-for-sale (2)  
Total Fair value, available for sale $ 1,776