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Fair Value Measurements (Schedule Of Assets And Liabilities At Fair Value Measured On A Recurring Basis) (Details) - USD ($)
$ in Millions
Jun. 30, 2023
Dec. 31, 2022
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Debt securities available for sale $ 27,296 $ 27,933
Residential mortgage servicing rights 801 812
Derivative Assets 88 105
Derivative Liabilities 1,525 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 27,296 27,933
Loans held for sale 340 196
Marketable Equity Securities carried at fair value 735 529
Residential mortgage servicing rights 801 812
Derivative Assets 3,424 2,609
Derivative Liabilities 4,358 3,378
Level 1 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Debt securities available for sale 1,191 1,187
Loans held for sale 0 0
Derivative Assets 1 3
Derivative Liabilities 3 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 1,191 1,187
Loans held for sale 0 0
Marketable Equity Securities carried at fair value 735 529
Residential mortgage servicing rights 0 0
Derivative Assets 1 3
Derivative Liabilities 3 2
Level 2 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Debt securities available for sale 26,104 26,744
Loans held for sale 490 335
Derivative Assets 3,410 2,603
Derivative Liabilities 4,354 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 26,104 26,744
Loans held for sale 276 177
Marketable Equity Securities carried at fair value 0 0
Residential mortgage servicing rights 0 0
Derivative Assets 3,410 2,603
Derivative Liabilities 4,354 3,375
Level 3 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Debt securities available for sale 1 2
Loans held for sale 64 19
Derivative Assets 13 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 1 2
Loans held for sale 64 19
Marketable Equity Securities carried at fair value 0 0
Residential mortgage servicing rights 801 812
Derivative Assets 13 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 3,140 2,335
Derivative Liabilities 4,110 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 3,140 2,335
Derivative Liabilities 4,110 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 108 94
Derivative Liabilities 90 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 95 91
Derivative Liabilities 90 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 13 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 10 8
Derivative Liabilities 4 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 10 8
Derivative Liabilities 4 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 166 172
Derivative Liabilities 154 127
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 1 3
Derivative Liabilities 3 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 165 169
Derivative Liabilities 150 124
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 1,191 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 1,191 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 1,191 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 926 836
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 926 836
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 926 836
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 16,570 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 16,570 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 16,570 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 7,425 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 7,425 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 7,425 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 81 186
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 81 186
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 81 186
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 1,101 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 1,101 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 1,100 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 $ 1 $ 1