v3.26.1
Derivative Instruments and Hedging Activities - Effect of Cash Flow Hedge Derivatives (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Balance at beginning of period $ 49,234 $ 49,511 $ 49,425 $ 48,375
Balance at end of period 50,147 49,451 50,147 49,451
Interest rate swaps | AOCI, Cash Flow Hedge, Parent        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Balance at beginning of period (158) 0 49 0
Gain (loss) recognized in other comprehensive income (315) (15) (540) (15)
Realized (gain) loss reclassified from AOCI to interest revenue 22 17 40 17
Balance at end of period $ (451) $ 2 $ (451) $ 2