Annual report [Section 13 and 15(d), not S-K Item 405]

Derivatives - Gains and Losses on Derivatives and Hedged Items Designated in Fair Value Hedges (Details)

v3.25.4
Derivatives - Gains and Losses on Derivatives and Hedged Items Designated in Fair Value Hedges (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Effect of Fair Value Hedges on Results of Operations [Abstract]      
Derivative $ (4,866) $ (511) $ 61
Hedged Item 4,757 438 (210)
Interest rate risk on long-term debt | Interest expense      
Effect of Fair Value Hedges on Results of Operations [Abstract]      
Derivative 3,346 (2,713) 3,594
Hedged Item (3,331) 2,669 (3,652)
Interest rate and foreign currency risk      
Effect of Fair Value Hedges on Results of Operations [Abstract]      
Derivative (21) 500 (17)
Hedged Item 15 (486) 27
Interest rate and foreign currency risk | Interest Income      
Effect of Fair Value Hedges on Results of Operations [Abstract]      
Derivative (3) 22 6
Interest rate and foreign currency risk | Interest expense      
Effect of Fair Value Hedges on Results of Operations [Abstract]      
Derivative 0 0 13
Interest rate and foreign currency risk | Market making and similar activities      
Effect of Fair Value Hedges on Results of Operations [Abstract]      
Derivative (10) 463 (51)
Interest rate risk on available-for-sale securities | Interest Income      
Effect of Fair Value Hedges on Results of Operations [Abstract]      
Derivative (5,387) 2,279 (3,518)
Hedged Item 5,269 (2,322) 3,417
Price risk on commodity inventory | Interest Income      
Effect of Fair Value Hedges on Results of Operations [Abstract]      
Derivative (2,804) (577) 2
Hedged Item 2,804 577 (2)
Accumulated Other Comprehensive Income (Loss) | Interest rate and foreign currency risk      
Effect of Fair Value Hedges on Results of Operations [Abstract]      
Derivative $ (8) $ 15 $ 15