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Fair Value Measurement - Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2024
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Assets:        
Fair Value   $ 83,013 $ 79,117  
Loans held for sale   $ 87 $ 347  
Derivative Asset, Statement of Financial Position [Extensible Enumeration]   Other assets Other assets  
Other assets:        
Derivative assets, gross amount   $ 2,232 $ 2,675  
Derivative Asset, netting adjustments   (1,056) (1,005)  
Derivative asset   1,176 1,670  
Liabilities:        
Derivative liabilities, gross amount   2,032 2,932  
Derivative Liability, netting adjustments   (304) (597)  
Derivative liability   $ 1,728 $ 2,335  
Derivative Liability, Statement of Financial Position [Extensible Enumeration]   Other liabilities Other liabilities  
Net valuation allowance   $ 1 $ 2  
Level 1        
Assets:        
Loans held for sale   0 0  
Level 2        
Assets:        
Loans held for sale   115 515  
Level 3        
Assets:        
Loans held for sale   0 0  
Recurring        
Assets:        
Fair Value   83,013 79,117  
Loans held for sale   87 347  
Other assets:        
Derivative asset   1,176 1,670  
Other   723 627  
Total   84,999 81,761  
Liabilities:        
Derivative liability   1,728 2,335  
Recurring | Level 1        
Assets:        
Fair Value   6,233 5,408  
Loans held for sale   0 0  
Other assets:        
Derivative assets, gross amount   510 788  
Other   689 589  
Total   7,432 6,785  
Liabilities:        
Derivative liabilities, gross amount   384 449  
Deferred compensation plan assets   688 578  
Recurring | Level 2        
Assets:        
Fair Value   76,662 73,431  
Loans held for sale   87 347  
Other assets:        
Derivative assets, gross amount   1,039 1,001  
Other   0 3  
Total   77,788 74,782  
Liabilities:        
Derivative liabilities, gross amount   1,034 1,655  
Recurring | Level 3        
Assets:        
Fair Value   118 278  
Loans held for sale   0 0  
Other assets:        
Derivative assets, gross amount   683 886 $ 79
Other   34 35  
Total   835 1,199  
Liabilities:        
Derivative liabilities, gross amount   614 828 $ 74
Retained interests in securitizations   34 35  
Recurring | Fair Value Inputs Level 1 And Level 2        
Liabilities:        
Equity securities   1 14  
Debt and equity securities, unrealized gain (loss) $ 5      
U.S. Treasury securities        
Assets:        
Fair Value   6,110 5,282  
U.S. Treasury securities | Recurring        
Assets:        
Fair Value   6,110 5,282  
U.S. Treasury securities | Recurring | Level 1        
Assets:        
Fair Value   6,110 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   65,328 63,638  
Total RMBS | Recurring        
Assets:        
Fair Value   65,328 63,638  
Total RMBS | Recurring | Level 1        
Assets:        
Fair Value   0 0  
Total RMBS | Recurring | Level 2        
Assets:        
Fair Value   65,212 63,492  
Total RMBS | Recurring | Level 3        
Assets:        
Fair Value   116 146  
CMBS | Recurring        
Assets:        
Fair Value   7,825 8,323  
CMBS | Recurring | Level 1        
Assets:        
Fair Value   0 0  
CMBS | Recurring | Level 2        
Assets:        
Fair Value   7,823 8,191  
CMBS | Recurring | Level 3        
Assets:        
Fair Value   2 132  
Other securities        
Assets:        
Fair Value   3,750 1,874  
Other securities | Recurring        
Assets:        
Fair Value   3,750 1,874  
Other securities | Recurring | Level 1        
Assets:        
Fair Value   123 126  
Other securities | Recurring | Level 2        
Assets:        
Fair Value   3,627 1,748  
Other securities | Recurring | Level 3        
Assets:        
Fair Value   $ 0 $ 0