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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, 2023 | Dec. 31, 2022
--- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Debt securities available for sale | $ 28,230 | $ 27,933
Residential mortgage servicing rights | 790 | 812
Derivative Assets | 97 | 105
Derivative Liabilities | 1,206 | 1,453
Recurring Fair Value Measurements [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Debt securities available for sale | 28,230 | 27,933
Loans held for sale | 242 | 196
Marketable Equity Securities carried at fair value | 650 | 529
Residential mortgage servicing rights | 790 | 812
Derivative Assets | 2,346 | 2,609
Derivative Liabilities | 2,852 | 3,378
Level 1 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Debt securities available for sale | 1,205 | 1,187
Loans held for sale | 0 | 0
Derivative Assets | 0 | 3
Derivative Liabilities | 2 | 2
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 | 1,205 | 1,187
Loans held for sale | 0 | 0
Marketable Equity Securities carried at fair value | 650 | 529
Residential mortgage servicing rights | 0 | 0
Derivative Assets | 0 | 3
Derivative Liabilities | 2 | 2
Level 2 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Debt securities available for sale | 27,023 | 26,744
Loans held for sale | 545 | 335
Derivative Assets | 2,337 | 2,603
Derivative Liabilities | 2,849 | 3,375
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 | 27,023 | 26,744
Loans held for sale | 223 | 177
Marketable Equity Securities carried at fair value | 0 | 0
Residential mortgage servicing rights | 0 | 0
Derivative Assets | 2,337 | 2,603
Derivative Liabilities | 2,849 | 3,375
Level 3 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Debt securities available for sale | 2 | 2
Loans held for sale | 19 | 19
Derivative Assets | 9 | 3
Derivative Liabilities | 1 | 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 | 2 | 2
Loans held for sale | 19 | 19
Marketable Equity Securities carried at fair value | 0 | 0
Residential mortgage servicing rights | 790 | 812
Derivative Assets | 9 | 3
Derivative Liabilities | 1 | 1
Interest Rate Swaps [Member] | Recurring Fair Value Measurements [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative Assets | 2,036 | 2,335
Derivative Liabilities | 2,569 | 3,161
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 Assets | 0 | 0
Derivative Liabilities | 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 Assets | 2,036 | 2,335
Derivative Liabilities | 2,569 | 3,161
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 Assets | 0 | 0
Derivative Liabilities | 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 Assets | 106 | 94
Derivative Liabilities | 87 | 85
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 Assets | 0 | 0
Derivative Liabilities | 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 Assets | 97 | 91
Derivative Liabilities | 87 | 85
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 Assets | 9 | 3
Derivative Liabilities | 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 Assets | 7 | 8
Derivative Liabilities | 6 | 5
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 Assets | 0 | 0
Derivative Liabilities | 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 Assets | 7 | 8
Derivative Liabilities | 6 | 5
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 Assets | 0 | 0
Derivative Liabilities | 0 | 0
Other Contracts [Member] | Recurring Fair Value Measurements [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative Assets | 197 | 172
Derivative Liabilities | 190 | 127
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 Assets | 0 | 3
Derivative Liabilities | 2 | 2
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 Assets | 197 | 169
Derivative Liabilities | 187 | 124
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 Assets | 0 | 0
Derivative Liabilities | 1 | 1
US Treasury Securities [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Debt securities available for sale | 1,205 | 1,187
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 | 1,205 | 1,187
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 | 1,205 | 1,187
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 | 946 | 836
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 | 946 | 836
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 | 946 | 836
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 | 17,165 | 16,954
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 | 17,165 | 16,954
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 | 17,165 | 16,954
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
Residential Non-Agency [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Debt securities available for sale |  | 1
Residential 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 | 0 | 1
Residential 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
Residential 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 | 0 | 0
Residential 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 | 1
Commercial Agency [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Debt securities available for sale | 7,657 | 7,613
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 | 7,657 | 7,613
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 | 7,657 | 7,613
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 | 123 | 186
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 | 123 | 186
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 | 123 | 186
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 | 1,132 | 1,154
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 | 1,132 | 1,154
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 | 1,130 | 1,153
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 | $ 2 | $ 1

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