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Fair Value Measurements (Schedule Of Assets And Liabilities At Fair Value Measured On A Recurring Basis) (Details) - USD ($) $ in Millions | Sep. 30, 2025 | Jun. 30, 2025 | Dec. 31, 2024 | Sep. 30, 2024 | Jun. 30, 2024 | Dec. 31, 2023
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Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Debt securities available for sale | $ 26,886 |  | $ 26,224 |  |  |
Servicing Asset at Fair Value, Amount | 976 |  | 1,007 |  |  |
Derivative Asset, Estimated Fair Value | 1,408 |  | 1,816 |  |  |
Derivative Liability, Estimated Fair Value | 1,497 |  | 2,551 |  |  |
Recurring Fair Value Measurements |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Debt securities available for sale | 26,886 |  | 26,224 |  |  |
Loans held for sale | 267 |  | 234 |  |  |
Marketable Equity Securities carried at fair value | 699 |  | 819 |  |  |
Derivative Asset, Estimated Fair Value | 1,408 |  | 1,816 |  |  |
Derivative Liability, Estimated Fair Value | 1,497 |  | 2,551 |  |  |
Security Sold Short, Fair Value | 17 |  | 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 | 2,266 |  | 2,003 |  |  |
Loans held for sale | 0 |  | 0 |  |  |
Marketable Equity Securities carried at fair value | 699 |  | 819 |  |  |
Derivative Asset, Estimated Fair Value | 1 |  | 13 |  |  |
Derivative Liability, Estimated Fair Value | 0 |  | 3 |  |  |
Security Sold Short, Fair Value | 17 |  | 147 |  |  |
Level 2 [Member] |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Loans held for sale | 251 |  | 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 | 24,615 |  | 24,218 |  |  |
Loans held for sale | 267 |  | 234 |  |  |
Marketable Equity Securities carried at fair value | 0 |  | 0 |  |  |
Derivative Asset, Estimated Fair Value | 1,399 |  | 1,798 |  |  |
Derivative Liability, Estimated Fair Value | 1,497 |  | 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 | 55 |  | 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 | 5 |  | 3 |  |  |
Loans held for sale | 0 |  | 0 |  |  |
Marketable Equity Securities carried at fair value | 0 |  | 0 |  |  |
Derivative Asset, Estimated Fair Value | 8 |  | 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 | 1,223 |  | 1,634 |  |  |
Derivative Liability, Estimated Fair Value | 1,345 |  | 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 | 1,223 |  | 1,634 |  |  |
Derivative Liability, Estimated Fair Value | 1,345 |  | 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 | 22 |  | 35 |  |  |
Derivative Liability, Estimated Fair Value | 9 |  | 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 | 14 |  | 30 |  |  |
Derivative Liability, Estimated Fair Value | 9 |  | 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 | 8 |  | 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 | 8 |  | 8 |  |  |
Derivative Liability, Estimated Fair Value | 3 |  | 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 | 8 |  | 8 |  |  |
Derivative Liability, Estimated Fair Value | 3 |  | 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 | 155 |  | 139 |  |  |
Derivative Liability, Estimated Fair Value | 140 |  | 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 | 1 |  | 13 |  |  |
Derivative Liability, Estimated Fair Value | 0 |  | 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 | 154 |  | 126 |  |  |
Derivative Liability, Estimated Fair Value | 140 |  | 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 |  | 0 |  |  |
U.S. Treasury securities |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Debt securities available for sale | 2,266 |  | 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 | 2,266 |  | 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 | 2,266 |  | 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 | 610 |  | 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 | 610 |  | 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 | 610 |  | 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 | 18,719 |  | 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 | 18,719 |  | 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 | 18,719 |  | 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 | 4,742 |  | 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 | 4,742 |  | 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 | 4,742 |  | 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 | 464 |  | 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 | 464 |  | 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 | 459 |  | 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 | 5 |  | 3 |  |  |
Residential Mortgage |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Servicing Asset at Fair Value, Amount | 976 | $ 988 | 1,007 | $ 971 | $ 1,020 | $ 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 | 976 |  | 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 | 976 |  | 1,007 |  |  |
Commercial Real Estate |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Servicing Asset at Fair Value, Amount | 91 | $ 93 | 97 | $ 87 | $ 90 | $ 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 |  |  | 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 | $ 91 |  | $ 97 |  |  |

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