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Fair Value (Fair Value Measurements - Recurring Quantitative Information) (Details)
$ in Millions
Sep. 30, 2025
USD ($)
Dec. 31, 2024
USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment securities – available-for-sale $ 68,297 $ 62,039
Mortgage servicing rights 3,627 3,711
Financial derivatives - Swaps related to sales of certain Visa Class B common shares (1,732) (3,168)
Fair Value, Recurring    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment securities – available-for-sale 68,297 62,039
Loans, fair value 1,117 1,156
Equity investments 3,177 3,132
Financial derivatives - Swaps related to sales of certain Visa Class B common shares (3,791) (5,495)
Recurring assets - fair value 86,789 77,246
Recurring liabilities - fair value 13,664 6,999
Residential mortgage-backed non-agency securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment securities – available-for-sale 560 603
Level 3    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Equity investments 2,237 2,111
Financial derivatives - Swaps related to sales of certain Visa Class B common shares (103) (143)
Insignificant assets, net of liabilities fair value disclosure (9) 45
Total recurring assets net of recurring liabilities - fair value 7,162 7,094
Level 3 | Consumer Portfolio Segment | Residential real estate    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Loans, fair value 71 73
Level 3 | Consumer Portfolio Segment | Loans - Residential real estate - Uninsured    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Loans, fair value 485 504
Level 3 | Consumer Portfolio Segment | Loans - Home equity - First-lien    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Loans, fair value 13 14
Level 3 | Consumer Portfolio Segment | Loans - Home equity - Second-lien    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Loans, fair value 71 79
Level 3 | Fair Value, Recurring    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment securities – available-for-sale 781 853
Loans, fair value 640 670
Equity investments 2,237 2,111
Financial derivatives - Swaps related to sales of certain Visa Class B common shares (108) (150)
Recurring assets - fair value 7,430 7,431
Recurring liabilities - fair value 268 337
Level 3 | Commercial mortgage loans held for sale    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Loans held for sale, fair value   4
Level 3 | Residential mortgage-backed non-agency securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment securities – available-for-sale 560 603
Level 3 | Asset-backed    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment securities – available-for-sale 88 93
Level 3 | Residential mortgage servicing rights    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Loans held for sale, fair value 122  
Mortgage servicing rights 2,622 2,626
Level 3 | Commercial mortgage servicing rights    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Mortgage servicing rights $ 1,005 $ 1,085
Spread over the benchmark curve | Level 3 | Commercial mortgage loans held for sale | Minimum    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Financing receivable, measurement input   0.0560
Spread over the benchmark curve | Level 3 | Commercial mortgage loans held for sale | Maximum    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Financing receivable, measurement input   0.1075
Spread over the benchmark curve | Level 3 | Commercial mortgage loans held for sale | Weighted Average    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Financing receivable, measurement input   0.0970
Spread over the benchmark curve | Level 3 | Residential mortgage-backed non-agency securities | Weighted Average    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Debt securities, measurement input 0.0187 0.0216
Spread over the benchmark curve | Level 3 | Asset-backed | Weighted Average    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Debt securities, measurement input 0.0170 0.0170
Spread over the benchmark curve | Level 3 | Residential mortgage servicing rights | Minimum    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Servicing asset, measurement input 0.0335 0.0381
Spread over the benchmark curve | Level 3 | Residential mortgage servicing rights | Maximum    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Servicing asset, measurement input 0.2871 0.2202
Spread over the benchmark curve | Level 3 | Residential mortgage servicing rights | Weighted Average    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Servicing asset, measurement input 0.0740 0.0755
Constant prepayment rate | Level 3 | Residential mortgage-backed non-agency securities | Minimum    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Debt securities, measurement input 0.010 0.010
Constant prepayment rate | Level 3 | Residential mortgage-backed non-agency securities | Maximum    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Debt securities, measurement input 0.279 0.279
Constant prepayment rate | Level 3 | Residential mortgage-backed non-agency securities | Weighted Average    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Debt securities, measurement input 0.037 0.042
Constant prepayment rate | Level 3 | Asset-backed | Minimum    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Debt securities, measurement input 0.010 0.010
Constant prepayment rate | Level 3 | Asset-backed | Maximum    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Debt securities, measurement input 0.080 0.080
Constant prepayment rate | Level 3 | Asset-backed | Weighted Average    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Debt securities, measurement input 0.042 0.038
Constant prepayment rate | Level 3 | Residential mortgage servicing rights | Minimum    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Servicing asset, measurement input 0.000 0.000
Constant prepayment rate | Level 3 | Residential mortgage servicing rights | Maximum    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Servicing asset, measurement input 0.465 0.403
Constant prepayment rate | Level 3 | Residential mortgage servicing rights | Weighted Average    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Servicing asset, measurement input 0.068 0.064
Constant prepayment rate | Level 3 | Commercial mortgage servicing rights | Minimum    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Servicing asset, measurement input 0.043 0.043
Constant prepayment rate | Level 3 | Commercial mortgage servicing rights | Maximum    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Servicing asset, measurement input 0.074 0.074
Constant prepayment rate | Level 3 | Commercial mortgage servicing rights | Weighted Average    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Servicing asset, measurement input 0.044 0.044
Constant default rate | Level 3 | Residential mortgage-backed non-agency securities | Minimum    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Debt securities, measurement input 0.000 0.000
Constant default rate | Level 3 | Residential mortgage-backed non-agency securities | Maximum    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Debt securities, measurement input 0.120 0.120
Constant default rate | Level 3 | Residential mortgage-backed non-agency securities | Weighted Average    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Debt securities, measurement input 0.018 0.019
Constant default rate | Level 3 | Asset-backed | Minimum    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Debt securities, measurement input 0.000 0.000
Constant default rate | Level 3 | Asset-backed | Maximum    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Debt securities, measurement input 0.074 0.071
Constant default rate | Level 3 | Asset-backed | Weighted Average    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Debt securities, measurement input 0.016 0.015
Loss severity | Level 3 | Minimum | Consumer Portfolio Segment | Loans - Residential real estate - Uninsured    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Financing receivable, measurement input 0.000 0.000
Loss severity | Level 3 | Minimum | Consumer Portfolio Segment | Loans - Home equity - First-lien    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Financing receivable, measurement input 0.000 0.000
Loss severity | Level 3 | Maximum | Consumer Portfolio Segment | Loans - Residential real estate - Uninsured    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Financing receivable, measurement input 1.000 1.000
Loss severity | Level 3 | Maximum | Consumer Portfolio Segment | Loans - Home equity - First-lien    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Financing receivable, measurement input 1.000 1.000
Loss severity | Level 3 | Weighted Average | Consumer Portfolio Segment | Residential real estate    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Financing receivable, measurement input 0.060 0.060
Loss severity | Level 3 | Weighted Average | Consumer Portfolio Segment | Loans - Residential real estate - Uninsured    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Financing receivable, measurement input 0.048 0.050
Loss severity | Level 3 | Weighted Average | Consumer Portfolio Segment | Loans - Home equity - First-lien    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Financing receivable, measurement input 0.117 0.123
Loss severity | Level 3 | Residential mortgage-backed non-agency securities | Minimum    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Debt securities, measurement input 0.150 0.150
Loss severity | Level 3 | Residential mortgage-backed non-agency securities | Maximum    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Debt securities, measurement input 1.000 0.690
Loss severity | Level 3 | Residential mortgage-backed non-agency securities | Weighted Average    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Debt securities, measurement input 0.425 0.424
Loss severity | Level 3 | Asset-backed | Minimum    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Debt securities, measurement input 0.350 0.350
Loss severity | Level 3 | Asset-backed | Maximum    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Debt securities, measurement input 1.000 1.000
Loss severity | Level 3 | Asset-backed | Weighted Average    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Debt securities, measurement input 0.431 0.453
Loss severity | Level 3 | Residential mortgage servicing rights | Minimum    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Financing receivable, measurement input 0.0  
Loss severity | Level 3 | Residential mortgage servicing rights | Maximum    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Financing receivable, measurement input 1.000  
Loss severity | Level 3 | Residential mortgage servicing rights | Weighted Average    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Financing receivable, measurement input 0.052  
Cumulative default rate | Level 3 | Minimum | Consumer Portfolio Segment | Loans - Residential real estate - Uninsured    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Financing receivable, measurement input 0.036 0.036
Cumulative default rate | Level 3 | Minimum | Consumer Portfolio Segment | Loans - Home equity - First-lien    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Financing receivable, measurement input 0.036 0.036
Cumulative default rate | Level 3 | Maximum | Consumer Portfolio Segment | Loans - Residential real estate - Uninsured    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Financing receivable, measurement input 1.000 1.000
Cumulative default rate | Level 3 | Maximum | Consumer Portfolio Segment | Loans - Home equity - First-lien    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Financing receivable, measurement input 1.000 1.000
Cumulative default rate | Level 3 | Weighted Average | Consumer Portfolio Segment | Loans - Residential real estate - Uninsured    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Financing receivable, measurement input 0.516 0.525
Cumulative default rate | Level 3 | Weighted Average | Consumer Portfolio Segment | Loans - Home equity - First-lien    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Financing receivable, measurement input 0.506 0.516
Cumulative default rate | Level 3 | Residential mortgage servicing rights | Minimum    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Financing receivable, measurement input 0.036  
Cumulative default rate | Level 3 | Residential mortgage servicing rights | Maximum    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Financing receivable, measurement input 1.000  
Cumulative default rate | Level 3 | Residential mortgage servicing rights | Weighted Average    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Financing receivable, measurement input 0.377  
Discount rate | Level 3 | Minimum | Consumer Portfolio Segment | Loans - Residential real estate - Uninsured    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Financing receivable, measurement input 0.055 0.055
Discount rate | Level 3 | Minimum | Consumer Portfolio Segment | Loans - Home equity - First-lien    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Financing receivable, measurement input 0.055 0.055
Discount rate | Level 3 | Maximum | Consumer Portfolio Segment | Loans - Residential real estate - Uninsured    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Financing receivable, measurement input 0.075 0.075
Discount rate | Level 3 | Maximum | Consumer Portfolio Segment | Loans - Home equity - First-lien    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Financing receivable, measurement input 0.075 0.075
Discount rate | Level 3 | Weighted Average | Consumer Portfolio Segment | Residential real estate    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Financing receivable, measurement input 0.067 0.072
Discount rate | Level 3 | Weighted Average | Consumer Portfolio Segment | Loans - Residential real estate - Uninsured    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Financing receivable, measurement input 0.057 0.057
Discount rate | Level 3 | Weighted Average | Consumer Portfolio Segment | Loans - Home equity - First-lien    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Financing receivable, measurement input 0.060 0.061
Discount rate | Level 3 | Residential mortgage servicing rights | Minimum    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Financing receivable, measurement input 0.055  
Discount rate | Level 3 | Residential mortgage servicing rights | Maximum    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Financing receivable, measurement input 0.090  
Discount rate | Level 3 | Residential mortgage servicing rights | Weighted Average    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Financing receivable, measurement input 0.059  
Discount rate | Level 3 | Commercial mortgage servicing rights | Minimum    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Servicing asset, measurement input 0.087 0.096
Discount rate | Level 3 | Commercial mortgage servicing rights | Maximum    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Servicing asset, measurement input 0.109 0.115
Discount rate | Level 3 | Commercial mortgage servicing rights | Weighted Average    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Servicing asset, measurement input 0.106 0.112
Credit and liquidity discount | Level 3 | Minimum | Consumer Portfolio Segment | Loans - Home equity - Second-lien    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Financing receivable, measurement input 0.000 0.003
Credit and liquidity discount | Level 3 | Maximum | Consumer Portfolio Segment | Loans - Home equity - Second-lien    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Financing receivable, measurement input 1.000 1.000
Credit and liquidity discount | Level 3 | Weighted Average | Consumer Portfolio Segment | Loans - Home equity - Second-lien    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Financing receivable, measurement input 0.398 0.412
Multiple of earnings | Level 3 | Minimum    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Equity securities, measurement input 0.055 0.055
Multiple of earnings | Level 3 | Maximum    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Equity securities, measurement input 0.240 0.267
Multiple of earnings | Level 3 | Weighted Average    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Equity securities, measurement input 0.105 0.105
Estimated Conversion Factor | Level 3 | Weighted Average    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative liability, measurement input 1.52 1.54
Estimated Annual Growth Rate | Level 3    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative liability, measurement input 0.160 0.160