v3.26.1
Fair Value Measurement - Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Mar. 31, 2026
Dec. 31, 2025
Mar. 31, 2025
Assets:      
Fair Value $ 90,620 $ 91,051  
Loans held for sale 169 755  
Other assets:      
Derivative assets, gross amount 3,412 2,201  
Derivative Asset, netting adjustments (520) (408)  
Derivative asset 2,892 1,793  
Liabilities:      
Derivative liabilities, gross amount 2,925 2,129  
Derivative Liability, netting adjustments (338) (501)  
Derivative liability $ 2,587 $ 1,628  
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 $ 5  
Level 1      
Assets:      
Loans held for sale 0 0  
Level 2      
Assets:      
Loans held for sale 17 5  
Level 3      
Assets:      
Loans held for sale 0 0  
Recurring      
Assets:      
Fair Value 90,620 91,051  
Loans held for sale 169 755  
Other assets:      
Derivative asset 2,892 1,793  
Other 879 865  
Total 94,560 94,464  
Liabilities:      
Derivative liability 2,587 1,628  
Total liabilities 2,587 1,628  
Recurring | Level 1      
Assets:      
Fair Value 9,122 10,147  
Loans held for sale 0 0  
Other assets:      
Derivative assets, gross amount 1,484 918  
Other 852 837  
Total 11,458 11,902  
Liabilities:      
Derivative liabilities, gross amount 1,459 500  
Total liabilities 1,459 500  
Deferred compensation plan assets 850 835  
Recurring | Level 2      
Assets:      
Fair Value 81,214 80,756  
Loans held for sale 169 755  
Other assets:      
Derivative assets, gross amount 1,507 839  
Other 0 0  
Total 82,890 82,350  
Liabilities:      
Derivative liabilities, gross amount 1,133 1,295  
Total liabilities 1,133 1,295  
Recurring | Level 3      
Assets:      
Fair Value 284 148  
Loans held for sale 0 0  
Other assets:      
Derivative assets, gross amount 421 444 $ 570
Other 27 28  
Total 732 620  
Liabilities:      
Derivative liabilities, gross amount 333 334 $ 481
Total liabilities 333 334  
Retained interests in securitizations 27 28  
Recurring | Fair Value Inputs Level 1 And Level 2      
Liabilities:      
Equity securities 2 2  
Debt and equity securities, unrealized gain (loss) 1 2  
U.S. Treasury securities      
Assets:      
Fair Value 8,966 10,013  
U.S. Treasury securities | Recurring      
Assets:      
Fair Value 8,966 10,013  
U.S. Treasury securities | Recurring | Level 1      
Assets:      
Fair Value 8,966 10,013  
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 69,613 69,728  
Total RMBS | Recurring      
Assets:      
Fair Value 69,613 69,728  
Total RMBS | Recurring | Level 1      
Assets:      
Fair Value 0 0  
Total RMBS | Recurring | Level 2      
Assets:      
Fair Value 69,459 69,602  
Total RMBS | Recurring | Level 3      
Assets:      
Fair Value 154 126  
CMBS | Recurring      
Assets:      
Fair Value 7,471 7,892  
CMBS | Recurring | Level 1      
Assets:      
Fair Value 0 0  
CMBS | Recurring | Level 2      
Assets:      
Fair Value 7,341 7,870  
CMBS | Recurring | Level 3      
Assets:      
Fair Value 130 22  
Other securities      
Assets:      
Fair Value 4,570 3,418  
Other securities | Recurring      
Assets:      
Fair Value 4,570 3,418  
Other securities | Recurring | Level 1      
Assets:      
Fair Value 156 134  
Other securities | Recurring | Level 2      
Assets:      
Fair Value 4,414 3,284  
Other securities | Recurring | Level 3      
Assets:      
Fair Value $ 0 $ 0