v3.26.3
Shareholders' Equity and Other Comprehensive Income (Loss) - Schedule of Changes in Accumulated Other Comprehensive Income (Loss) by Component (Net of Income Taxes) (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2026
Sep. 30, 2025
Sep. 30, 2026
Sep. 30, 2025
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Beginning balance $ 14,828 $ 6,637 $ 7,044 $ 6,432
Other comprehensive income (loss) before reclassifications (523) 60 (664) 5
Amounts reclassified from AOCI (1) (2) 16 3
Total other comprehensive income (loss) (524) 58 (648) 8
Ending balance 14,610 6,856 14,610 6,856
Unrealized losses on investment securities available for sale related to residual tax effects remaining in OCI     5 5
Total        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Beginning balance (247) (218) (123) (168)
Total other comprehensive income (loss) (524) 58 (648) 8
Ending balance (771) (160) (771) (160)
Net unamortized holding (losses) gains on AFS securities transferred to HTM        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Beginning balance 9 14 12 18
Other comprehensive income (loss) before reclassifications 0 0 0 0
Amounts reclassified from AOCI (1) (2) (4) (6)
Total other comprehensive income (loss) (1) (2) (4) (6)
Ending balance 8 12 8 12
Net unrealized gains (losses) on securities AFS        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Beginning balance (208) (216) (105) (160)
Other comprehensive income (loss) before reclassifications (511) 70 (634) 5
Amounts reclassified from AOCI 1 0 21 9
Total other comprehensive income (loss) (510) 70 (613) 14
Ending balance (718) (146) (718) (146)
Net unrealized gains (losses) on cash flow hedges        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Beginning balance (48) (16) (30) (26)
Other comprehensive income (loss) before reclassifications (12) (10) (30) 0
Amounts reclassified from AOCI (1) 0 (1) 0
Total other comprehensive income (loss) (13) (10) (31) 0
Ending balance $ (61) $ (26) $ (61) $ (26)