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Fair Value Measurement - Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - USD ($)
$ in Millions
 9 Months Ended 12 Months Ended
Sep. 30, 2024
Dec. 31, 2023
Sep. 30, 2023
Assets:      
Fair Value $ 83,500 $ 79,117  
Loans held for sale $ 77 $ 347  
Derivative Asset, Statement of Financial Position [Extensible Enumeration] Other assets Other assets  
Other assets:      
Derivative assets, gross amount $ 2,408 $ 2,675  
Derivative Asset, netting adjustments (725) (1,005)  
Derivative asset 1,683 1,670  
Liabilities:      
Derivative liabilities, gross amount 2,657 2,932  
Derivative Liability, netting adjustments (622) (597)  
Derivative liability $ 2,035 $ 2,335  
Derivative Liability, Statement of Financial Position [Extensible Enumeration] Other liabilities Other liabilities  
Net valuation allowance $ 3 $ 2  
Level 1      
Assets:      
Loans held for sale 0 0  
Level 2      
Assets:      
Loans held for sale 19 515  
Level 3      
Assets:      
Loans held for sale 0 0  
Recurring      
Assets:      
Fair Value 83,500 79,117  
Loans held for sale 77 347  
Other assets:      
Derivative asset 1,683 1,670  
Other 709 627  
Total 85,969 81,761  
Liabilities:      
Derivative liability 2,035 2,335  
Recurring | Level 1      
Assets:      
Fair Value 6,163 5,408  
Loans held for sale 0 0  
Other assets:      
Derivative assets, gross amount 866 788  
Other 675 589  
Total 7,704 6,785  
Liabilities:      
Derivative liabilities, gross amount 574 449  
Deferred compensation plan assets 670 578  
Recurring | Level 2      
Assets:      
Fair Value 77,155 73,431  
Loans held for sale 77 347  
Other assets:      
Derivative assets, gross amount 929 1,001  
Other 0 3  
Total 78,161 74,782  
Liabilities:      
Derivative liabilities, gross amount 1,515 1,655  
Recurring | Level 3      
Assets:      
Fair Value 182 278  
Loans held for sale 0 0  
Other assets:      
Derivative assets, gross amount 613 886 $ 1,300
Other 34 35  
Total 829 1,199  
Liabilities:      
Derivative liabilities, gross amount 568 828 $ 1,300
Retained interests in securitizations 34 35  
Recurring | Fair Value Inputs Level 1 And Level 2      
Liabilities:      
Equity securities 5 14  
Debt and equity securities, unrealized gain (loss) 5 5  
U.S. Treasury securities      
Assets:      
Fair Value 6,032 5,282  
U.S. Treasury securities | Recurring      
Assets:      
Fair Value 6,032 5,282  
U.S. Treasury securities | Recurring | Level 1      
Assets:      
Fair Value 6,032 5,282  
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 66,307 63,638  
Total RMBS | Recurring      
Assets:      
Fair Value 66,307 63,638  
Total RMBS | Recurring | Level 1      
Assets:      
Fair Value 0 0  
Total RMBS | Recurring | Level 2      
Assets:      
Fair Value 66,127 63,492  
Total RMBS | Recurring | Level 3      
Assets:      
Fair Value 180 146  
CMBS | Recurring      
Assets:      
Fair Value 8,183 8,323  
CMBS | Recurring | Level 1      
Assets:      
Fair Value 0 0  
CMBS | Recurring | Level 2      
Assets:      
Fair Value 8,181 8,191  
CMBS | Recurring | Level 3      
Assets:      
Fair Value 2 132  
Other securities      
Assets:      
Fair Value 2,978 1,874  
Other securities | Recurring      
Assets:      
Fair Value 2,978 1,874  
Other securities | Recurring | Level 1      
Assets:      
Fair Value 131 126  
Other securities | Recurring | Level 2      
Assets:      
Fair Value 2,847 1,748  
Other securities | Recurring | Level 3      
Assets:      
Fair Value $ 0 $ 0