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Fair Value Measurement - Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Assets:      
Fair Value $ 91,051 $ 83,013  
Loans held for sale 755 87  
Other assets:      
Derivative assets, gross amount 2,201 2,232  
Derivative Asset, netting adjustments (408) (1,056)  
Derivative asset 1,793 1,176  
Liabilities:      
Derivative liabilities, gross amount 2,129 2,032  
Derivative Liability, netting adjustments (501) (304)  
Derivative liability $ 1,628 $ 1,728  
Derivative Liability, Statement of Financial Position [Extensible Enumeration] Other liabilities Other liabilities  
Derivative Asset, Statement of Financial Position [Extensible Enumeration] Other assets Other assets  
Net valuation allowance $ 5 $ 1  
Level 1      
Assets:      
Loans held for sale 0 0  
Level 2      
Assets:      
Loans held for sale 5 115  
Level 3      
Assets:      
Loans held for sale 0 0  
Recurring      
Assets:      
Fair Value 91,051 83,013  
Loans held for sale 755 87  
Other assets:      
Derivative asset 1,793 1,176  
Other 865 723  
Total 94,464 84,999  
Liabilities:      
Derivative liability 1,628 1,728  
Total liabilities (1,628) (1,728)  
Recurring | Level 1      
Assets:      
Fair Value 10,147 6,233  
Loans held for sale 0 0  
Other assets:      
Derivative assets, gross amount 918 510  
Other 837 689  
Total 11,902 7,432  
Liabilities:      
Derivative liabilities, gross amount 500 384  
Total liabilities (500) (384)  
Deferred compensation plan assets 835 688  
Recurring | Level 2      
Assets:      
Fair Value 80,756 76,662  
Loans held for sale 755 87  
Other assets:      
Derivative assets, gross amount 839 1,039  
Other 0 0  
Total 82,350 77,788  
Liabilities:      
Derivative liabilities, gross amount 1,295 1,034  
Total liabilities (1,295) (1,034)  
Recurring | Level 3      
Assets:      
Fair Value 148 118  
Loans held for sale 0 0  
Other assets:      
Derivative assets, gross amount 444 683 $ 886
Other 28 34  
Total 620 835  
Liabilities:      
Derivative liabilities, gross amount 334 614 $ 828
Total liabilities (334) (614)  
Retained interests in securitizations 28 34  
Recurring | Fair Value Inputs Level 1 And Level 2      
Liabilities:      
Equity securities 2 1  
Debt and equity securities, unrealized gain (loss) 2    
U.S. Treasury securities      
Assets:      
Fair Value 10,013 6,110  
U.S. Treasury securities | Recurring      
Assets:      
Fair Value 10,013 6,110  
U.S. Treasury securities | Recurring | Level 1      
Assets:      
Fair Value 10,013 6,110  
U.S. Treasury securities | Recurring | Level 2      
Assets:      
Fair Value 0 0  
U.S. Treasury securities | Recurring | Level 3      
Assets:      
Fair Value 0 0  
Total RMBS      
Assets:      
Fair Value 69,728 65,328  
Total RMBS | Recurring      
Assets:      
Fair Value 69,728 65,328  
Total RMBS | Recurring | Level 1      
Assets:      
Fair Value 0 0  
Total RMBS | Recurring | Level 2      
Assets:      
Fair Value 69,602 65,212  
Total RMBS | Recurring | Level 3      
Assets:      
Fair Value 126 116  
CMBS | Recurring      
Assets:      
Fair Value 7,892 7,825  
CMBS | Recurring | Level 1      
Assets:      
Fair Value 0 0  
CMBS | Recurring | Level 2      
Assets:      
Fair Value 7,870 7,823  
CMBS | Recurring | Level 3      
Assets:      
Fair Value 22 2  
Other securities      
Assets:      
Fair Value 3,418 3,750  
Other securities | Recurring      
Assets:      
Fair Value 3,418 3,750  
Other securities | Recurring | Level 1      
Assets:      
Fair Value 134 123  
Other securities | Recurring | Level 2      
Assets:      
Fair Value 3,284 3,627  
Other securities | Recurring | Level 3      
Assets:      
Fair Value $ 0 $ 0