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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, 2024
Dec. 31, 2023
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Debt securities available for sale $ 28,698 $ 28,104
Residential mortgage servicing rights 971 906
Derivative Asset, Estimated Fair Value 1,640 2,105
Derivative Liability, Estimated Fair Value 1,808 2,691
Recurring Fair Value Measurements    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Debt securities available for sale 28,698 28,104
Loans held for sale 255 201
Marketable Equity Securities carried at fair value 804 813
Residential mortgage servicing rights 971 906
Derivative Asset, Estimated Fair Value 1,640 2,105
Derivative Liability, Estimated Fair Value 1,808 2,691
Level 1 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Debt securities available for sale 2,046 1,223
Loans held for sale 0 0
Derivative Asset, Estimated Fair Value 12 0
Derivative Liability, Estimated Fair Value 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 2,046 1,223
Loans held for sale 0 0
Marketable Equity Securities carried at fair value 804 813
Residential mortgage servicing rights 0 0
Derivative Asset, Estimated Fair Value 12 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 26,649 26,880
Loans held for sale 509 397
Derivative Asset, Estimated Fair Value 1,617 2,101
Derivative Liability, Estimated Fair Value 1,808 2,690
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 26,649 26,880
Loans held for sale 255 201
Marketable Equity Securities carried at fair value 0 0
Residential mortgage servicing rights 0 0
Derivative Asset, Estimated Fair Value 1,617 2,101
Derivative Liability, Estimated Fair Value 1,808 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 13 3
Derivative Asset, Estimated Fair Value 11 4
Derivative Liability, Estimated Fair Value 0 1
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 1
Loans held for sale 0 0
Marketable Equity Securities carried at fair value 0 0
Residential mortgage servicing rights 971 906
Derivative Asset, Estimated Fair Value 11 4
Derivative Liability, Estimated Fair Value 0 1
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 1,435 1,813
Derivative Liability, Estimated Fair Value 1,650 2,419
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 1,435 1,813
Derivative Liability, Estimated Fair Value 1,650 2,419
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 52 87
Derivative Liability, Estimated Fair Value 33 70
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 41 83
Derivative Liability, Estimated Fair Value 33 70
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 11 4
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 7
Derivative Liability, Estimated Fair Value 2 12
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 7
Derivative Liability, Estimated Fair Value 2 12
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 146 198
Derivative Liability, Estimated Fair Value 123 190
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 12 0
Derivative Liability, Estimated Fair Value 0 0
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 134 198
Derivative Liability, Estimated Fair Value 123 189
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 1
U.S. Treasury securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Debt securities available for sale 2,046 1,223
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 2,046 1,223
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 2,046 1,223
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 457 1,043
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 457 1,043
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 457 1,043
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 20,459 17,372
Residential agency | Recurring Fair Value Measurements    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Debt securities available for sale 20,459 17,372
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 20,459 17,372
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 4,922 7,307
Commercial agency | Recurring Fair Value Measurements    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Debt securities available for sale 4,922 7,307
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 4,922 7,307
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 85 83
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 85 83
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 85 83
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 727 1,074
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 727 1,074
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 724 1,073
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 $ 1