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Fair Values of Assets and Liabilities - Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - USD ($)
$ in Millions
 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Jun. 30, 2025
Dec. 31, 2024
Jun. 30, 2024
Dec. 31, 2023
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Available-for-sale securities [1] $ 89,065     $ 85,992    
Mortgage loans held for sale 2,288     2,251    
Mortgage servicing rights 3,289 $ 3,187 $ 3,305 3,369 $ 3,326 $ 3,377
Derivative assets netting (3,282)     (2,979)    
Time deposits 4,924     5,754    
Long-term debt 1,408     391    
Derivative liabilities netting (3,838)     (2,949)    
Equity investments without readily determinable fair values 173     159    
Equity investments without readily determinable fair values impairment loss 0 $ 0        
U.S. Treasury and agencies            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Available-for-sale securities 27,068     28,387    
Residential mortgage-backed securities | Agency            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Available-for-sale securities 37,677     33,281    
Commercial mortgage-backed securities | Agency            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Available-for-sale securities 7,694     7,351    
Commercial mortgage-backed securities | Non-agency            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Available-for-sale securities 7     6    
Asset-backed securities            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Available-for-sale securities 6,865     7,165    
Obligations of state and political subdivisions            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Available-for-sale securities 9,486     9,552    
Other            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Available-for-sale securities 268     250    
Fair Value, Measurements, Recurring            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Available-for-sale securities 89,065     85,992    
Mortgage loans held for sale 2,288     2,251    
Mortgage servicing rights 3,289     3,369    
Derivative assets netting (3,282)     (2,979)    
Derivative assets 3,690     3,458    
Other assets 3,137     2,189    
Total assets 101,469     97,259    
Time deposits 4,924     5,754    
Long-term debt 1,408     391    
Derivative liabilities netting (3,838)     (2,949)    
Derivative liabilities 3,131     5,211    
Short-term borrowings and other liabilities 2,592     1,935    
Total liabilities 12,055     13,291    
Fair Value, Measurements, Recurring | U.S. Treasury and agencies            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Available-for-sale securities 27,068     28,387    
Fair Value, Measurements, Recurring | Residential mortgage-backed securities            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Available-for-sale securities 37,677     33,281    
Fair Value, Measurements, Recurring | Commercial mortgage-backed securities | Agency            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Available-for-sale securities 7,694     7,351    
Fair Value, Measurements, Recurring | Commercial mortgage-backed securities | Non-agency            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Available-for-sale securities 7     6    
Fair Value, Measurements, Recurring | Asset-backed securities            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Available-for-sale securities 6,865     7,165    
Fair Value, Measurements, Recurring | Obligations of state and political subdivisions            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Available-for-sale securities 9,486     9,552    
Fair Value, Measurements, Recurring | Other            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Available-for-sale securities 268     250    
Fair Value, Measurements, Recurring | Level 1            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Available-for-sale securities 22,355     23,891    
Mortgage loans held for sale 0     0    
Mortgage servicing rights 0     0    
Derivative assets before netting 92     27    
Other assets 412     420    
Total assets 22,859     24,338    
Time deposits 0     0    
Long-term debt 0     0    
Derivative liabilities before netting 82     27    
Short-term borrowings and other liabilities 752     475    
Total liabilities 834     502    
Fair Value, Measurements, Recurring | Level 1 | U.S. Treasury and agencies            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Available-for-sale securities 22,355     23,891    
Fair Value, Measurements, Recurring | Level 1 | Residential mortgage-backed securities            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Available-for-sale securities 0     0    
Fair Value, Measurements, Recurring | Level 1 | Commercial mortgage-backed securities | Agency            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Available-for-sale securities 0     0    
Fair Value, Measurements, Recurring | Level 1 | Commercial mortgage-backed securities | Non-agency            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Available-for-sale securities 0     0    
Fair Value, Measurements, Recurring | Level 1 | Asset-backed securities            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Available-for-sale securities 0     0    
Fair Value, Measurements, Recurring | Level 1 | Obligations of state and political subdivisions            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Available-for-sale securities 0     0    
Fair Value, Measurements, Recurring | Level 1 | Other            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Available-for-sale securities 0     0    
Fair Value, Measurements, Recurring | Level 2            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Available-for-sale securities 66,710     62,101    
Mortgage loans held for sale 2,288     2,251    
Mortgage servicing rights 0     0    
Derivative assets before netting 4,797     5,208    
Other assets 2,725     1,769    
Total assets 76,520     71,329    
Time deposits 4,924     5,754    
Long-term debt 1,408     391    
Derivative liabilities before netting 4,874     5,131    
Short-term borrowings and other liabilities 1,840     1,460    
Total liabilities 13,046     12,736    
Fair Value, Measurements, Recurring | Level 2 | U.S. Treasury and agencies            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Available-for-sale securities 4,713     4,496    
Fair Value, Measurements, Recurring | Level 2 | Residential mortgage-backed securities            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Available-for-sale securities 37,677     33,281    
Fair Value, Measurements, Recurring | Level 2 | Commercial mortgage-backed securities | Agency            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Available-for-sale securities 7,694     7,351    
Fair Value, Measurements, Recurring | Level 2 | Commercial mortgage-backed securities | Non-agency            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Available-for-sale securities 7     6    
Fair Value, Measurements, Recurring | Level 2 | Asset-backed securities            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Available-for-sale securities 6,865     7,165    
Fair Value, Measurements, Recurring | Level 2 | Obligations of state and political subdivisions            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Available-for-sale securities 9,486     9,552    
Fair Value, Measurements, Recurring | Level 2 | Other            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Available-for-sale securities 268     250    
Fair Value, Measurements, Recurring | Level 3            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Available-for-sale securities 0     0    
Mortgage loans held for sale 0     0    
Mortgage servicing rights 3,289     3,369    
Derivative assets before netting 2,083     1,202    
Other assets 0     0    
Total assets 5,372     4,571    
Time deposits 0     0    
Long-term debt 0     0    
Derivative liabilities before netting 2,013     3,002    
Short-term borrowings and other liabilities 0     0    
Total liabilities 2,013     3,002    
Fair Value, Measurements, Recurring | Level 3 | U.S. Treasury and agencies            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Available-for-sale securities 0     0    
Fair Value, Measurements, Recurring | Level 3 | Residential mortgage-backed securities            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Available-for-sale securities 0     0    
Fair Value, Measurements, Recurring | Level 3 | Commercial mortgage-backed securities | Agency            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Available-for-sale securities 0     0    
Fair Value, Measurements, Recurring | Level 3 | Commercial mortgage-backed securities | Non-agency            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Available-for-sale securities 0     0    
Fair Value, Measurements, Recurring | Level 3 | Asset-backed securities            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Available-for-sale securities 0     0    
Fair Value, Measurements, Recurring | Level 3 | Obligations of state and political subdivisions            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Available-for-sale securities 0     0    
Fair Value, Measurements, Recurring | Level 3 | Other            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Available-for-sale securities $ 0     $ 0    
[1] Includes only collateral pledged by the Company where counterparties have the right to sell or pledge the collateral.