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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, 2024 | Dec. 31, 2023
--- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Debt securities available for sale | $ 27,881 | $ 28,104
Residential mortgage servicing rights | 1,026 | 906
Derivative Asset, Estimated Fair Value | 2,231 | 2,105
Derivative Liability, Estimated Fair Value | 3,096 | 2,691
Recurring Fair Value Measurements [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Debt securities available for sale | 27,881 | 28,104
Loans held for sale | 259 | 201
Marketable Equity Securities carried at fair value | 747 | 813
Residential mortgage servicing rights | 1,026 | 906
Derivative Asset, Estimated Fair Value | 2,231 | 2,105
Derivative Liability, Estimated Fair Value | 3,096 | 2,691
Level 1 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Debt securities available for sale | 1,110 | 1,223
Loans held for sale | 0 | 0
Derivative Asset, Estimated Fair Value | 0 | 0
Derivative Liability, Estimated Fair Value | 0 | 0
Level 1 [Member] | Recurring Fair Value Measurements [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Debt securities available for sale | 1,110 | 1,223
Loans held for sale | 0 | 0
Marketable Equity Securities carried at fair value | 747 | 813
Residential mortgage servicing rights | 0 | 0
Derivative Asset, Estimated Fair Value | 0 | 0
Derivative Liability, Estimated Fair Value | 0 | 0
Level 2 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Debt securities available for sale | 26,768 | 26,880
Loans held for sale | 414 | 397
Derivative Asset, Estimated Fair Value | 2,221 | 2,101
Derivative Liability, Estimated Fair Value | 3,096 | 2,690
Level 2 [Member] | Recurring Fair Value Measurements [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Debt securities available for sale | 26,768 | 26,880
Loans held for sale | 259 | 201
Marketable Equity Securities carried at fair value | 0 | 0
Residential mortgage servicing rights | 0 | 0
Derivative Asset, Estimated Fair Value | 2,221 | 2,101
Derivative Liability, Estimated Fair Value | 3,096 | 2,690
Level 3 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Debt securities available for sale | 3 | 1
Loans held for sale | 3 | 3
Derivative Asset, Estimated Fair Value | 10 | 4
Derivative Liability, Estimated Fair Value | 0 | 1
Level 3 [Member] | Recurring Fair Value Measurements [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Debt securities available for sale | 3 | 1
Loans held for sale | 0 | 0
Marketable Equity Securities carried at fair value | 0 | 0
Residential mortgage servicing rights | 1,026 | 906
Derivative Asset, Estimated Fair Value | 10 | 4
Derivative Liability, Estimated Fair Value | 0 | 1
Interest Rate Swaps [Member] | Recurring Fair Value Measurements [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative Asset, Estimated Fair Value | 1,965 | 1,813
Derivative Liability, Estimated Fair Value | 2,869 | 2,419
Interest Rate Swaps [Member] | Level 1 [Member] | Recurring Fair Value Measurements [Member] |  |
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 [Member] | Level 2 [Member] | Recurring Fair Value Measurements [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative Asset, Estimated Fair Value | 1,965 | 1,813
Derivative Liability, Estimated Fair Value | 2,869 | 2,419
Interest Rate Swaps [Member] | Level 3 [Member] | Recurring Fair Value Measurements [Member] |  |
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 [Member] | Recurring Fair Value Measurements [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative Asset, Estimated Fair Value | 76 | 87
Derivative Liability, Estimated Fair Value | 62 | 70
Interest Rate Options [Member] | Level 1 [Member] | Recurring Fair Value Measurements [Member] |  |
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 [Member] | Level 2 [Member] | Recurring Fair Value Measurements [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative Asset, Estimated Fair Value | 66 | 83
Derivative Liability, Estimated Fair Value | 62 | 70
Interest Rate Options [Member] | Level 3 [Member] | Recurring Fair Value Measurements [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative Asset, Estimated Fair Value | 10 | 4
Derivative Liability, Estimated Fair Value | 0 | 0
Interest Rate Futures And Forward Commitments [Member] | Recurring Fair Value Measurements [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative Asset, Estimated Fair Value | 10 | 7
Derivative Liability, Estimated Fair Value | 1 | 12
Interest Rate Futures And Forward Commitments [Member] | Level 1 [Member] | Recurring Fair Value Measurements [Member] |  |
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 [Member] | Level 2 [Member] | Recurring Fair Value Measurements [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative Asset, Estimated Fair Value | 10 | 7
Derivative Liability, Estimated Fair Value | 1 | 12
Interest Rate Futures And Forward Commitments [Member] | Level 3 [Member] | Recurring Fair Value Measurements [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative Asset, Estimated Fair Value |  | 0
Derivative Liability, Estimated Fair Value | 0 | 0
Other Contracts [Member] | Recurring Fair Value Measurements [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative Asset, Estimated Fair Value | 180 | 198
Derivative Liability, Estimated Fair Value | 164 | 190
Other Contracts [Member] | Level 1 [Member] | Recurring Fair Value Measurements [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative Asset, Estimated Fair Value | 0 |
Derivative Liability, Estimated Fair Value | 0 | 0
Other Contracts [Member] | Level 2 [Member] | Recurring Fair Value Measurements [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative Asset, Estimated Fair Value | 180 | 198
Derivative Liability, Estimated Fair Value | 164 | 189
Other Contracts [Member] | Level 3 [Member] | Recurring Fair Value Measurements [Member] |  |
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 | 1
US Treasury Securities [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Debt securities available for sale | 1,110 | 1,223
US Treasury Securities [Member] | Recurring Fair Value Measurements [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Debt securities available for sale | 1,110 | 1,223
US Treasury Securities [Member] | Level 1 [Member] | Recurring Fair Value Measurements [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Debt securities available for sale | 1,110 | 1,223
US Treasury Securities [Member] | Level 2 [Member] | Recurring Fair Value Measurements [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Debt securities available for sale | 0 | 0
US Treasury Securities [Member] | Level 3 [Member] | Recurring Fair Value Measurements [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Debt securities available for sale | 0 | 0
Federal agency securities [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Debt securities available for sale | 545 | 1,043
Federal agency securities [Member] | Recurring Fair Value Measurements [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Debt securities available for sale | 545 | 1,043
Federal agency securities [Member] | Level 1 [Member] | Recurring Fair Value Measurements [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Debt securities available for sale | 0 | 0
Federal agency securities [Member] | Level 2 [Member] | Recurring Fair Value Measurements [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Debt securities available for sale | 545 | 1,043
Federal agency securities [Member] | Level 3 [Member] | Recurring Fair Value Measurements [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Debt securities available for sale | 0 | 0
US States and Political Subdivisions Debt Securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Debt securities available for sale | 2 | 2
US States and Political Subdivisions Debt Securities | Recurring Fair Value Measurements [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Debt securities available for sale | 2 | 2
US States and Political Subdivisions Debt Securities | Level 1 [Member] | Recurring Fair Value Measurements [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Debt securities available for sale | 0 | 0
US States and Political Subdivisions Debt Securities | Level 2 [Member] | Recurring Fair Value Measurements [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Debt securities available for sale | 2 | 2
US States and Political Subdivisions Debt Securities | Level 3 [Member] | Recurring Fair Value Measurements [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Debt securities available for sale | 0 | 0
Residential Agency [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Debt securities available for sale | 18,350 | 17,372
Residential Agency [Member] | Recurring Fair Value Measurements [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Debt securities available for sale | 18,350 | 17,372
Residential Agency [Member] | Level 1 [Member] | Recurring Fair Value Measurements [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Debt securities available for sale | 0 | 0
Residential Agency [Member] | Level 2 [Member] | Recurring Fair Value Measurements [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Debt securities available for sale | 18,350 | 17,372
Residential Agency [Member] | Level 3 [Member] | Recurring Fair Value Measurements [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Debt securities available for sale | 0 | 0
Commercial Agency [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Debt securities available for sale | 6,777 | 7,307
Commercial Agency [Member] | Recurring Fair Value Measurements [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Debt securities available for sale | 6,777 | 7,307
Commercial Agency [Member] | Level 1 [Member] | Recurring Fair Value Measurements [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Debt securities available for sale | 0 | 0
Commercial Agency [Member] | Level 2 [Member] | Recurring Fair Value Measurements [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Debt securities available for sale | 6,777 | 7,307
Commercial Agency [Member] | Level 3 [Member] | Recurring Fair Value Measurements [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Debt securities available for sale | 0 | 0
Commercial Non Agency [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Debt securities available for sale | 82 | 83
Commercial Non Agency [Member] | Recurring Fair Value Measurements [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Debt securities available for sale | 82 | 83
Commercial Non Agency [Member] | Level 1 [Member] | Recurring Fair Value Measurements [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Debt securities available for sale | 0 | 0
Commercial Non Agency [Member] | Level 2 [Member] | Recurring Fair Value Measurements [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Debt securities available for sale | 82 | 83
Commercial Non Agency [Member] | Level 3 [Member] | Recurring Fair Value Measurements [Member] |  |
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 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Debt securities available for sale | 1,015 | 1,074
Corporate and other debt securities [Member] | Recurring Fair Value Measurements [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Debt securities available for sale | 1,015 | 1,074
Corporate and other debt securities [Member] | Level 1 [Member] | Recurring Fair Value Measurements [Member] |  |
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 [Member] | Level 2 [Member] | Recurring Fair Value Measurements [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Debt securities available for sale | 1,012 | 1,073
Corporate and other debt securities [Member] | Level 3 [Member] | Recurring Fair Value Measurements [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Debt securities available for sale | $ 3 | $ 1

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