Quarterly report [Sections 13 or 15(d)]

Fair Value Measurements - Nonrecurring Fair Value (Details)

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Fair Value Measurements - Nonrecurring Fair Value (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Dec. 31, 2024
Assets and Liabilities Measured at Fair Value on a Nonrecurring Basis          
Loans held-for-sale $ 2,071   $ 2,071   $ 2,214
Loans and leases 6,694   6,694   4,249
Other assets 9,830   9,830   $ 13,176
Nonrecurring          
Gains (Losses)          
Loans held-for-sale (1) $ (62) 49 $ (160)  
Loans and leases (10) (10) (23) (26)  
Foreclosed properties (2) (17) 1 (15)  
Other assets (11) 0 (14) (40)  
Loss on loans and leases written down to zero 2 3 5 7  
Nonrecurring | Government Guaranteed Mortgage Loans upon Foreclosure Receivable          
Assets and Liabilities Measured at Fair Value on a Nonrecurring Basis          
Foreclosed properties 15 19 15 19  
Nonrecurring | Level 2          
Assets and Liabilities Measured at Fair Value on a Nonrecurring Basis          
Loans held-for-sale 157 795 157 795  
Loans and leases 0 0 0 0  
Foreclosed properties 0 0 0 0  
Other assets 0 1 0 1  
Nonrecurring | Level 3          
Assets and Liabilities Measured at Fair Value on a Nonrecurring Basis          
Loans held-for-sale 0 2,685 0 2,685  
Loans and leases 89 89 89 89  
Foreclosed properties 63 149 63 149  
Other assets $ 329 $ 274 $ 329 $ 274