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Other Comprehensive Income (Loss) - Components of Other Comprehensive Income (Loss) Including Reclassification Adjustments by Income Statement (Detail) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Jun. 30, 2025
Dec. 31, 2024
Jun. 30, 2024
Dec. 31, 2023
Accumulated Other Comprehensive Income (Loss), before Tax [Roll Forward]                
Pretax total accumulated other comprehensive income (loss), beginning balance $ (128) $ (2,180) $ (1,809) $ (2,053)        
Pretax total accumulated other comprehensive income (loss), Investment securities 362 2,013 2,028 1,514        
Pretax total accumulated other comprehensive income (loss), before reclassifications 362 2,013 2,028 1,514        
Pretax total accumulated other comprehensive income (loss), Net realized gains (losses) on securities 3 36 (11) (336)        
Pretax total accumulated other comprehensive income (loss), Interest expense     (1)          
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, Tax     0          
After tax total accumulated other comprehensive income (loss), Interest expense     (1)          
Total reclassification adjustment for amounts realized in net income, pre tax 3 36 (12) (336)        
Total other comprehensive income (loss), pre tax 359 1,977 2,040 1,850        
Pretax total accumulated other comprehensive income (loss), ending balance 231 (203) 231 (203)        
Stockholders' Equity Attributable to Parent 35,445 27,159 35,445 27,159   $ 25,591    
Accumulated Other Comprehensive Income (Loss), Tax [Roll Forward]                
Total tax (provision) benefit, beginning balance 33 464 386 437        
Total tax (provision) benefit, Investment securities (76) (423) (426) (318)        
Total tax (provision) benefit, before reclassifications (76) (423) (426) (318)        
Total tax (provision) benefit, Net realized gains (losses) on securities (1) (7) 2 71        
Total reclassification adjustment for amounts realized in net income, Total tax (provision) benefit (1) (7) 2 71        
Total other comprehensive income (loss), tax (provision) benefit (75) (416) (428) (389)        
Total tax (provision) benefit, ending balance (42) 48 (42) 48        
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]                
After tax total accumulated other comprehensive income (loss), beginning balance (95) (1,716) (1,423) (1,616)        
After tax total accumulated other comprehensive income (loss), Investment securities 286 1,590 1,602 1,196        
After tax total accumulated other comprehensive income (loss), before reclassifications 286 1,590 1,602 1,196        
After tax total accumulated other comprehensive income (loss), Net realized gains (losses) on securities 2 29 (9) (265)        
Total reclassification adjustment for amounts realized in net income, after tax 2 29 (10) (265)        
Total other comprehensive income (loss), after tax 284 1,561 1,612 1,461        
After tax total accumulated other comprehensive income (loss), ending balance 189 (155) 189 (155)        
Total net unrealized gains (losses) on securities                
Accumulated Other Comprehensive Income (Loss), before Tax [Roll Forward]                
After tax total accumulated other comprehensive income (loss), Interest expense     0          
Stockholders' Equity Attributable to Parent 203 (140) 203 (140) $ (81) (1,408) $ (1,701) $ (1,601)
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]                
After tax total accumulated other comprehensive income (loss), Investment securities 286 1,590 1,602 1,196        
After tax total accumulated other comprehensive income (loss), before reclassifications 286 1,590 1,602 1,196        
After tax total accumulated other comprehensive income (loss), Net realized gains (losses) on securities 2 29 (9) (265)        
Total reclassification adjustment for amounts realized in net income, after tax 2 29 (9) (265)        
Total other comprehensive income (loss), after tax 284 1,561 1,611 1,461        
Net unrealized losses on forecasted transactions                
Accumulated Other Comprehensive Income (Loss), before Tax [Roll Forward]                
After tax total accumulated other comprehensive income (loss), Interest expense     (1)          
Stockholders' Equity Attributable to Parent (13) (14) (13) (14) (13) (14) (14) (14)
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]                
After tax total accumulated other comprehensive income (loss), Investment securities 0 0 0 0        
After tax total accumulated other comprehensive income (loss), before reclassifications 0 0 0 0        
After tax total accumulated other comprehensive income (loss), Net realized gains (losses) on securities 0 0 0 0        
Total reclassification adjustment for amounts realized in net income, after tax 0 0 (1) 0        
Total other comprehensive income (loss), after tax 0 0 1 0        
Foreign currency translation adjustment                
Accumulated Other Comprehensive Income (Loss), before Tax [Roll Forward]                
After tax total accumulated other comprehensive income (loss), Interest expense     0          
Stockholders' Equity Attributable to Parent (1) (1) (1) (1) $ (1) $ (1) $ (1) $ (1)
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]                
After tax total accumulated other comprehensive income (loss), Investment securities 0 0 0 0        
After tax total accumulated other comprehensive income (loss), before reclassifications 0 0 0 0        
After tax total accumulated other comprehensive income (loss), Net realized gains (losses) on securities 0 0 0 0        
Total reclassification adjustment for amounts realized in net income, after tax 0 0 0 0        
Total other comprehensive income (loss), after tax $ 0 $ 0 $ 0 $ 0