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Fair Value Measurements (Schedule Of Assets And Liabilities At Fair Value Measured On A Recurring Basis) (Details) - USD ($) $ in Millions | Mar. 31, 2025 | Dec. 31, 2024 | Mar. 31, 2024 | Dec. 31, 2023
--- | --- | --- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Debt securities available for sale | $ 25,942 | $ 26,224 |  |
Servicing Asset at Fair value. Amount | 979 | 1,007 |  |
Derivative Asset, Estimated Fair Value | 1,548 | 1,816 |  |
Derivative Liability, Estimated Fair Value | 1,957 | 2,551 |  |
Recurring Fair Value Measurements |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Debt securities available for sale | 25,942 | 26,224 |  |
Loans held for sale | 227 | 234 |  |
Marketable Equity Securities carried at fair value | 653 | 819 |  |
Derivative Asset, Estimated Fair Value | 1,548 | 1,816 |  |
Derivative Liability, Estimated Fair Value | 1,957 | 2,551 |  |
Security Sold Short, Fair Value | 170 | 147 |  |
Level 1 [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Loans held for sale | 0 | 0 |  |
Level 1 [Member] | Recurring Fair Value Measurements |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Debt securities available for sale | 2,061 | 2,003 |  |
Loans held for sale | 0 | 0 |  |
Marketable Equity Securities carried at fair value | 653 | 819 |  |
Derivative Asset, Estimated Fair Value | 20 | 13 |  |
Derivative Liability, Estimated Fair Value | 1 | 3 |  |
Security Sold Short, Fair Value | 170 | 147 |  |
Level 2 [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Loans held for sale | 90 | 360 |  |
Level 2 [Member] | Recurring Fair Value Measurements |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Debt securities available for sale | 23,878 | 24,218 |  |
Loans held for sale | 227 | 234 |  |
Marketable Equity Securities carried at fair value | 0 | 0 |  |
Derivative Asset, Estimated Fair Value | 1,522 | 1,798 |  |
Derivative Liability, Estimated Fair Value | 1,956 | 2,548 |  |
Security Sold Short, Fair Value | 0 |  | $ 0 |
Level 3 [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Loans held for sale | 28 | 0 |  |
Level 3 [Member] | Recurring Fair Value Measurements |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Debt securities available for sale | 3 | 3 |  |
Loans held for sale | 0 | 0 |  |
Marketable Equity Securities carried at fair value | 0 | 0 |  |
Derivative Asset, Estimated Fair Value | 6 | 5 |  |
Derivative Liability, Estimated Fair Value | 0 | 0 |  |
Security Sold Short, Fair Value | 0 |  | 0 |
Interest rate swaps | Recurring Fair Value Measurements |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Derivative Asset, Estimated Fair Value | 1,332 | 1,634 |  |
Derivative Liability, Estimated Fair Value | 1,783 | 2,411 |  |
Interest rate swaps | Level 1 [Member] | Recurring Fair Value Measurements |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Derivative Asset, Estimated Fair Value | 0 | 0 |  |
Derivative Liability, Estimated Fair Value | 0 | 0 |  |
Interest rate swaps | Level 2 [Member] | Recurring Fair Value Measurements |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Derivative Asset, Estimated Fair Value | 1,332 | 1,634 |  |
Derivative Liability, Estimated Fair Value | 1,783 | 2,411 |  |
Interest rate swaps | Level 3 [Member] | Recurring Fair Value Measurements |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Derivative Asset, Estimated Fair Value | 0 | 0 |  |
Derivative Liability, Estimated Fair Value | 0 | 0 |  |
Interest rate options | Recurring Fair Value Measurements |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Derivative Asset, Estimated Fair Value | 31 | 35 |  |
Derivative Liability, Estimated Fair Value | 21 | 30 |  |
Interest rate options | Level 1 [Member] | Recurring Fair Value Measurements |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Derivative Asset, Estimated Fair Value | 0 | 0 |  |
Derivative Liability, Estimated Fair Value | 0 | 0 |  |
Interest rate options | Level 2 [Member] | Recurring Fair Value Measurements |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Derivative Asset, Estimated Fair Value | 25 | 30 |  |
Derivative Liability, Estimated Fair Value | 21 | 30 |  |
Interest rate options | Level 3 [Member] | Recurring Fair Value Measurements |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Derivative Asset, Estimated Fair Value | 6 | 5 |  |
Derivative Liability, Estimated Fair Value | 0 | 0 |  |
Interest rate futures and forward commitments | Recurring Fair Value Measurements |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Derivative Asset, Estimated Fair Value | 7 | 8 |  |
Derivative Liability, Estimated Fair Value | 2 | 4 |  |
Interest rate futures and forward commitments | Level 1 [Member] | Recurring Fair Value Measurements |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Derivative Asset, Estimated Fair Value | 0 | 0 |  |
Derivative Liability, Estimated Fair Value | 0 | 0 |  |
Interest rate futures and forward commitments | Level 2 [Member] | Recurring Fair Value Measurements |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Derivative Asset, Estimated Fair Value | 7 | 8 |  |
Derivative Liability, Estimated Fair Value | 2 | 4 |  |
Interest rate futures and forward commitments | Level 3 [Member] | Recurring Fair Value Measurements |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Derivative Asset, Estimated Fair Value | 0 | 0 |  |
Derivative Liability, Estimated Fair Value | 0 | 0 |  |
Other Contracts [Member] | Recurring Fair Value Measurements |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Derivative Asset, Estimated Fair Value | 178 | 139 |  |
Derivative Liability, Estimated Fair Value | 151 | 106 |  |
Other Contracts [Member] | Level 1 [Member] | Recurring Fair Value Measurements |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Derivative Asset, Estimated Fair Value | 20 | 13 |  |
Derivative Liability, Estimated Fair Value | 1 | 3 |  |
Other Contracts [Member] | Level 2 [Member] | Recurring Fair Value Measurements |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Derivative Asset, Estimated Fair Value | 158 | 126 |  |
Derivative Liability, Estimated Fair Value | 150 | 103 |  |
Other Contracts [Member] | Level 3 [Member] | Recurring Fair Value Measurements |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Derivative Asset, Estimated Fair Value | 0 | 0 |  |
Derivative Liability, Estimated Fair Value | 0 |  |  |
U.S. Treasury securities |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Debt securities available for sale | 2,061 | 2,003 |  |
U.S. Treasury securities | Recurring Fair Value Measurements |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Debt securities available for sale | 2,061 | 2,003 |  |
U.S. Treasury securities | Level 1 [Member] | Recurring Fair Value Measurements |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Debt securities available for sale | 2,061 | 2,003 |  |
U.S. Treasury securities | Level 2 [Member] | Recurring Fair Value Measurements |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Debt securities available for sale | 0 | 0 |  |
U.S. Treasury securities | Level 3 [Member] | Recurring Fair Value Measurements |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Debt securities available for sale | 0 | 0 |  |
Federal agency securities |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Debt securities available for sale | 485 | 444 |  |
Federal agency securities | Recurring Fair Value Measurements |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Debt securities available for sale | 485 | 444 |  |
Federal agency securities | Level 1 [Member] | Recurring Fair Value Measurements |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Debt securities available for sale | 0 | 0 |  |
Federal agency securities | Level 2 [Member] | Recurring Fair Value Measurements |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Debt securities available for sale | 485 | 444 |  |
Federal agency securities | Level 3 [Member] | Recurring Fair Value Measurements |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Debt securities available for sale | 0 | 0 |  |
Obligations of states and political subdivisions |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Debt securities available for sale | 2 | 2 |  |
Obligations of states and political subdivisions | Recurring Fair Value Measurements |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Debt securities available for sale | 2 | 2 |  |
Obligations of states and political subdivisions | Level 1 [Member] | Recurring Fair Value Measurements |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Debt securities available for sale | 0 | 0 |  |
Obligations of states and political subdivisions | Level 2 [Member] | Recurring Fair Value Measurements |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Debt securities available for sale | 2 | 2 |  |
Obligations of states and political subdivisions | Level 3 [Member] | Recurring Fair Value Measurements |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Debt securities available for sale | 0 | 0 |  |
Residential agency |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Debt securities available for sale | 18,583 | 18,945 |  |
Residential agency | Recurring Fair Value Measurements |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Debt securities available for sale | 18,583 | 18,945 |  |
Residential agency | Level 1 [Member] | Recurring Fair Value Measurements |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Debt securities available for sale | 0 | 0 |  |
Residential agency | Level 2 [Member] | Recurring Fair Value Measurements |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Debt securities available for sale | 18,583 | 18,945 |  |
Residential agency | Level 3 [Member] | Recurring Fair Value Measurements |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Debt securities available for sale | 0 | 0 |  |
Commercial agency |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Debt securities available for sale | 4,095 | 4,090 |  |
Commercial agency | Recurring Fair Value Measurements |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Debt securities available for sale | 4,095 | 4,090 |  |
Commercial agency | Level 1 [Member] | Recurring Fair Value Measurements |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Debt securities available for sale | 0 | 0 |  |
Commercial agency | Level 2 [Member] | Recurring Fair Value Measurements |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Debt securities available for sale | 4,095 | 4,090 |  |
Commercial agency | Level 3 [Member] | Recurring Fair Value Measurements |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Debt securities available for sale | 0 | 0 |  |
Commercial non-agency |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Debt securities available for sale | 83 | 82 |  |
Commercial non-agency | Recurring Fair Value Measurements |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Debt securities available for sale | 83 | 82 |  |
Commercial non-agency | Level 1 [Member] | Recurring Fair Value Measurements |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Debt securities available for sale | 0 | 0 |  |
Commercial non-agency | Level 2 [Member] | Recurring Fair Value Measurements |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Debt securities available for sale | 83 | 82 |  |
Commercial non-agency | Level 3 [Member] | Recurring Fair Value Measurements |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Debt securities available for sale | 0 | 0 |  |
Corporate and other debt securities |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Debt securities available for sale | 633 | 658 |  |
Corporate and other debt securities | Recurring Fair Value Measurements |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Debt securities available for sale | 633 | 658 |  |
Corporate and other debt securities | Level 1 [Member] | Recurring Fair Value Measurements |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Debt securities available for sale | 0 | 0 |  |
Corporate and other debt securities | Level 2 [Member] | Recurring Fair Value Measurements |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Debt securities available for sale | 630 | 655 |  |
Corporate and other debt securities | Level 3 [Member] | Recurring Fair Value Measurements |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Debt securities available for sale | 3 | 3 |  |
Residential Mortgage |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Servicing Asset at Fair value. Amount | 979 | 1,007 | 1,026 | $ 906
Residential Mortgage | Recurring Fair Value Measurements |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Servicing Asset at Fair value. Amount | 979 | 1,007 |  |
Residential Mortgage | Level 1 [Member] | Recurring Fair Value Measurements |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Servicing Asset at Fair value. Amount | 0 | 0 |  |
Residential Mortgage | Level 2 [Member] | Recurring Fair Value Measurements |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Servicing Asset at Fair value. Amount | 0 | 0 |  |
Residential Mortgage | Level 3 [Member] | Recurring Fair Value Measurements |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Servicing Asset at Fair value. Amount | 979 | 1,007 |  |
Commercial Real Estate |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Servicing Asset at Fair value. Amount | 94 | 97 | $ 88 | $ 81
Commercial Real Estate | Recurring Fair Value Measurements |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Servicing Asset at Fair value. Amount | 94 | 97 |  |
Commercial Real Estate | Level 1 [Member] | Recurring Fair Value Measurements |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Servicing Asset at Fair value. Amount | 0 | 0 |  |
Commercial Real Estate | Level 2 [Member] | Recurring Fair Value Measurements |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Servicing Asset at Fair value. Amount | 0 | 0 |  |
Commercial Real Estate | Level 3 [Member] | Recurring Fair Value Measurements |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Servicing Asset at Fair value. Amount | $ 94 | $ 97 |  |

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