v3.26.1
Shareholders' Equity - Adjustments to Accumulated Other Comprehensive Income (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2026
Mar. 31, 2026
Jun. 30, 2025
Mar. 31, 2025
Jun. 30, 2026
Jun. 30, 2025
Class of Stock [Line Items]            
Gains related to investment securities, net $ 0   $ 0   $ (1) $ 0
Net interest income (860)   (729)   (1,695) (1,443)
Net income (1,084) $ (764) (693) $ (644) (1,848) (1,337)
Amounts Reclassified into Earnings            
Class of Stock [Line Items]            
Net income 22   60   55 116
Amounts Reclassified into Earnings | Net Unrealized Gains (Losses) on Investment Securities            
Class of Stock [Line Items]            
Gains related to investment securities, net         (1) 0
Net interest income 13   33   27 60
Net realized gains from sales of available-for-sale securities, tax         0 0
Amortization of net unrealized gain (loss), before adjustment, tax 5   10   10 30
Amounts Reclassified into Earnings | Net Unrealized Gains (Losses) on Cash Flow Hedges            
Class of Stock [Line Items]            
Net interest income 9   27   29 56
Net realized gains from sales of available-for-sale securities, tax $ 2   $ 9   $ 8 $ 17