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Fair Value (Fair Value Measurements - Recurring Quantitative Information) (Details)
$ in Millions
Jun. 30, 2024
USD ($)
Dec. 31, 2023
USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment securities – available for sale $ 51,188 $ 41,785
Fair value 3,739 3,686
Derivative Liability (3,706) (3,538)
Fair Value, Recurring    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment securities – available for sale 51,188 41,785
Loans, fair value 1,191 1,238
Equity investments 3,203 2,717
Derivative Liability (6,216) (5,899)
Recurring assets - fair value 66,296 56,862
Residential mortgage-backed non-agency securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment securities – available for sale 624 696
Level 3    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Loans held for sale, fair value 4 11
Equity investments 2,030 1,952
Derivative Liability (180) (145)
Insignificant assets, fair value disclosure 66 22
Total recurring assets net of recurring liabilities - fair value 7,080 7,050
Level 3 | Total consumer | Residential real estate    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Loans, fair value 71 546
Level 3 | Total consumer | Loans - Residential real estate - Uninsured    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Loans, fair value 532 75
Level 3 | Total consumer | Home equity    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Loans, fair value 82 87
Level 3 | Total consumer | Loans - Home equity - First-lien    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Loans, fair value 16 18
Level 3 | Fair Value, Recurring    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment securities – available for sale 877 956
Loans, fair value 701 726
Equity investments 2,030 1,952
Derivative Liability (183) (152)
Recurring assets - fair value 7,466 7,448
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 624 696
Level 3 | Asset-backed    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment securities – available for sale 96 102
Level 3 | Residential mortgage servicing rights    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair value 2,657 2,654
Level 3 | Commercial mortgage servicing rights    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair value $ 1,082 $ 1,032
Spread over the benchmark curve | Level 3 | Minimum    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Financing receivable, measurement input 0.0575 0.0575
Spread over the benchmark curve | Level 3 | Maximum    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Financing receivable, measurement input 0.1090 0.3610
Spread over the benchmark curve | Level 3 | Weighted Average    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Financing receivable, measurement input 0.0985 0.1647
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 0.0272 0.0285
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 0.0227 0.0248
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 0.0336 0.0337
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 0.2338 0.1668
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 0.0764 0.0765
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 0.029 0.037
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 0.280 0.280
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 0.045 0.051
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 0.407 0.336
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 0.063 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 0.051 0.053
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 0.083 0.097
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 0.053 0.055
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 0.019 0.027
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 0.081 0.043
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 0.017
Loss severity | Level 3 | Minimum | Total consumer | Residential real estate    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Financing receivable, measurement input   0.000
Loss severity | Level 3 | Minimum | Total consumer | Loans - Residential real estate - Uninsured    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Financing receivable, measurement input 0.000  
Loss severity | Level 3 | Minimum | Total consumer | 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 | Total consumer | Residential real estate    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Financing receivable, measurement input   1.000
Loss severity | Level 3 | Maximum | Total consumer | Loans - Residential real estate - Uninsured    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Financing receivable, measurement input 1.000  
Loss severity | Level 3 | Maximum | Total consumer | 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 | Total consumer | Residential real estate    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Financing receivable, measurement input 0.060 0.054
Loss severity | Level 3 | Weighted Average | Total consumer | Loans - Residential real estate - Uninsured    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Financing receivable, measurement input 0.051 0.060
Loss severity | Level 3 | Weighted Average | Total consumer | Loans - Home equity - First-lien    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Financing receivable, measurement input 0.129 0.144
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 0.100 0.100
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 0.774 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 0.422 0.412
Loss severity | Level 3 | Asset-backed | Minimum    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Debt securities, measurement input 0.300 0.200
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 0.487 0.495
Cumulative default rate | Level 3 | Minimum | Total consumer | Residential real estate    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Financing receivable, measurement input   0.036
Cumulative default rate | Level 3 | Minimum | Total consumer | Loans - Residential real estate - Uninsured    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Financing receivable, measurement input 0.036  
Cumulative default rate | Level 3 | Minimum | Total consumer | 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 | Total consumer | Residential real estate    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Financing receivable, measurement input   1.000
Cumulative default rate | Level 3 | Maximum | Total consumer | Loans - Residential real estate - Uninsured    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Financing receivable, measurement input 1.000  
Cumulative default rate | Level 3 | Maximum | Total consumer | 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 | Total consumer | Residential real estate    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Financing receivable, measurement input   0.591
Cumulative default rate | Level 3 | Weighted Average | Total consumer | Loans - Residential real estate - Uninsured    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Financing receivable, measurement input 0.574  
Cumulative default rate | Level 3 | Weighted Average | Total consumer | Loans - Home equity - First-lien    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Financing receivable, measurement input 0.586 0.609
Discount rate | Level 3 | Minimum | Total consumer | Residential real estate    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Financing receivable, measurement input   0.055
Discount rate | Level 3 | Minimum | Total consumer | Loans - Residential 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 | Minimum | Total consumer | 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 | Total consumer | Residential real estate    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Financing receivable, measurement input   0.075
Discount rate | Level 3 | Maximum | Total consumer | Loans - Residential 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 | Maximum | Total consumer | 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 | Total consumer | Residential real estate    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Financing receivable, measurement input 0.080 0.058
Discount rate | Level 3 | Weighted Average | Total consumer | Loans - Residential real estate - Uninsured    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Financing receivable, measurement input 0.058 0.078
Discount rate | Level 3 | Weighted Average | Total consumer | Loans - Home equity - First-lien    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Financing receivable, measurement input 0.061 0.062
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 0.081 0.076
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 0.103 0.100
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 0.100 0.096
Credit and liquidity discount | Level 3 | Minimum | Total consumer | Home equity    
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 | Total consumer | Home equity    
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 | Total consumer | Home equity    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Financing receivable, measurement input 0.421 0.438
Multiple of earnings | Level 3 | Minimum    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Equity securities, measurement input 0.050 0.045
Multiple of earnings | Level 3 | Maximum    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Equity securities, measurement input 0.270 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 0.103 0.101
Estimated Conversion Factor | Level 3 | Weighted Average    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative liability, measurement input 1.59 1.59
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