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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, 2024
Sep. 30, 2023
Jun. 30, 2024
Dec. 31, 2023
Jun. 30, 2023
Dec. 31, 2022
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Available-for-sale securities [1] $ 81,704     $ 69,706    
Mortgage loans held for sale 2,887     2,011    
Mortgage servicing rights 3,187 $ 3,582 $ 3,326 3,377 $ 3,633 $ 3,755
Derivative assets netting (2,878)     (3,666)    
Time deposits 7,655     2,818    
Long-term debt 45     0    
Derivative liabilities netting (2,847)     (3,720)    
Equity investments without readily determinable fair values 133     133    
Equity investments without readily determinable fair values impairment loss cumulative amount 0     5    
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 29,399     19,542    
Residential mortgage-backed securities | Agency            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Available-for-sale securities 27,766     26,078    
Commercial mortgage-backed securities | Agency            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Available-for-sale securities 7,605     7,343    
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 6,788     6,724    
Obligations of state and political subdivisions            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Available-for-sale securities 9,888     9,989    
Other            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Available-for-sale securities 251     24    
Fair Value, Measurements, Recurring            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Available-for-sale securities 81,704     69,706    
Mortgage loans held for sale 2,887     2,011    
Mortgage servicing rights 3,187     3,377    
Derivative assets netting (2,878)     (3,666)    
Derivative assets 3,488     2,865    
Other assets 2,625     2,541    
Total assets 93,891     80,500    
Time deposits 7,655     2,818    
Long-term debt 45          
Derivative liabilities netting (2,847)     (3,720)    
Derivative liabilities 3,757     4,589    
Short-term borrowings and other liabilities 2,406     2,303    
Total liabilities 13,863     9,710    
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 29,399     19,542    
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 27,766     26,078    
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 7,605     7,343    
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 6,788     6,724    
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 9,888     9,989    
Fair Value, Measurements, Recurring | Other            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Available-for-sale securities 251     24    
Fair Value, Measurements, Recurring | Level 1            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Available-for-sale securities 24,689     14,787    
Mortgage loans held for sale 0     0    
Mortgage servicing rights 0     0    
Derivative assets before netting 30     0    
Other assets 440     550    
Total assets 25,159     15,337    
Time deposits 0     0    
Long-term debt 0          
Derivative liabilities before netting 16     16    
Short-term borrowings and other liabilities 514     517    
Total liabilities 530     533    
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 24,689     14,787    
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 57,015     54,919    
Mortgage loans held for sale 2,887     2,011    
Mortgage servicing rights 0     0    
Derivative assets before netting 4,773     5,078    
Other assets 2,185     1,991    
Total assets 66,860     63,999    
Time deposits 7,655     2,818    
Long-term debt 45          
Derivative liabilities before netting 4,213     4,955    
Short-term borrowings and other liabilities 1,892     1,786    
Total liabilities 13,805     9,559    
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 4,710     4,755    
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 27,766     26,078    
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 7,605     7,343    
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 6,788     6,724    
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 9,888     9,989    
Fair Value, Measurements, Recurring | Level 2 | Other            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Available-for-sale securities 251     24    
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 3,187     3,377    
Derivative assets before netting 1,563     1,453    
Other assets 0     0    
Total assets 4,750     4,830    
Time deposits 0     0    
Long-term debt 0          
Derivative liabilities before netting 2,375     3,338    
Short-term borrowings and other liabilities 0     0    
Total liabilities 2,375     3,338    
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.