v3.26.1
Fair Value (Fair Value Measurements - Recurring Quantitative Information) (Details)
$ in Millions
Mar. 31, 2026
USD ($)
Dec. 31, 2025
USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment securities – available-for-sale $ 71,072 $ 68,135
Mortgage servicing rights 3,816 3,659
Residential mortgage-backed non-agency securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment securities – available-for-sale 533 548
Level 3    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Equity investments 2,341 2,503
Insignificant assets, net of liabilities fair value disclosure 274 164
Total recurring assets net of recurring liabilities - fair value 7,424 7,456
Level 3 | Total consumer lending | Loans - Residenital real estate - Uninsured    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Loans, fair value 460 474
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   108
Mortgage servicing rights 2,786 2,638
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 533 548
Level 3 | Commercial mortgage loans held for sale    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Mortgage servicing rights   $ 1,021
Level 3 | Commercial mortgage servicing rights    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Mortgage servicing rights $ 1,030  
Cumulative default rate | Level 3 | Minimum | Total consumer lending | Loans - Residenital 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 | Maximum | Total consumer lending | Loans - Residenital 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 | Weighted Average | Total consumer lending | Loans - Residenital real estate - Uninsured    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Financing receivable, measurement input 0.535 0.527
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   0.338
Loss severity | Level 3 | Weighted Average | Total consumer lending | Loans - Residenital real estate - Uninsured    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Financing receivable, measurement input 0.052 0.050
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   0.057
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
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
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 0.419 0.425
Discount rate | Level 3 | Minimum    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Equity securities, measurement input   0.055
Discount rate | Level 3 | Minimum | Total consumer lending | Loans - Residenital real estate - Uninsured    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Financing receivable, measurement input 0.055  
Discount rate | Level 3 | Maximum    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Equity securities, measurement input   0.075
Discount rate | Level 3 | Maximum | Total consumer lending | Loans - Residenital real estate - Uninsured    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Financing receivable, measurement input 0.075  
Discount rate | Level 3 | Weighted Average    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Equity securities, measurement input   0.057
Discount rate | Level 3 | Weighted Average | Total consumer lending | Loans - Residenital real estate - Uninsured    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Financing receivable, measurement input 0.057  
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 0.088 0.087
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 0.111 0.109
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 0.108 0.106
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 0.429 0.414
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 0.067
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 0.231 0.231
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 0.021 0.037
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 0.042 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 0.071 0.070
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 0.135 0.135
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 0.020 0.019
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 0.0343  
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 0.1658  
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 0.0709  
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 0.0158 0.0176
Spread over the benchmark curve | Level 3 | Commercial mortgage servicing rights | Minimum    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Servicing asset, measurement input   0.0314
Spread over the benchmark curve | Level 3 | Commercial mortgage servicing rights | Maximum    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Servicing asset, measurement input   0.3270
Spread over the benchmark curve | 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   0.0734
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  
Multiple of earnings | Level 3 | Maximum    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Equity securities, measurement input 0.220  
Multiple of earnings | Level 3 | Weighted Average    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Equity securities, measurement input 0.108  
Multiple of earnings | Level 3 | Residential mortgage servicing rights | Minimum    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Servicing asset, measurement input   0.055
Multiple of earnings | Level 3 | Residential mortgage servicing rights | Maximum    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Servicing asset, measurement input   0.240
Multiple of earnings | 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   0.108