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Fair Value Measurements (Schedule Of Assets And Liabilities At Fair Value Measured On A Recurring Basis) (Details) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt securities available for sale	$ 26,224	$ 28,104
Servicing Asset at Fair value. Amount	1,007	906
Derivative Asset, Estimated Fair Value	1,816	2,105
Derivative Liability, Estimated Fair Value	2,551	2,691
Recurring Fair Value Measurements
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt securities available for sale	26,224	28,104
Loans held for sale	234	201
Marketable Equity Securities carried at fair value	819	813
Derivative Asset, Estimated Fair Value	1,816	2,105
Derivative Liability, Estimated Fair Value	2,551	2,691
Security Sold Short, Fair Value	147	0
Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt securities available for sale	2,003	1,223
Loans held for sale	0	0
Derivative Asset, Estimated Fair Value	13	0
Derivative Liability, Estimated Fair Value	3	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	2,003	1,223
Loans held for sale	0	0
Marketable Equity Securities carried at fair value	819	813
Derivative Asset, Estimated Fair Value	13	0
Derivative Liability, Estimated Fair Value	3	0
Security Sold Short, Fair Value	147	0
Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt securities available for sale	24,218	26,880
Loans held for sale	594	397
Derivative Asset, Estimated Fair Value	1,798	2,101
Derivative Liability, Estimated Fair Value	2,548	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	24,218	26,880
Loans held for sale	234	201
Marketable Equity Securities carried at fair value	0	0
Derivative Asset, Estimated Fair Value	1,798	2,101
Derivative Liability, Estimated Fair Value	2,548	2,690
Security Sold Short, Fair Value	0	0
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	0	3
Derivative Asset, Estimated Fair Value	5	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
Derivative Asset, Estimated Fair Value	5	4
Derivative Liability, Estimated Fair Value	0	1
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	1,634	1,813
Derivative Liability, Estimated Fair Value	2,411	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	1,634	1,813
Derivative Liability, Estimated Fair Value	2,411	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	35	87
Derivative Liability, Estimated Fair Value	30	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	30	83
Derivative Liability, Estimated Fair Value	30	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	5	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	8	7
Derivative Liability, Estimated Fair Value	4	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	8	7
Derivative Liability, Estimated Fair Value	4	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	139	198
Derivative Liability, Estimated Fair Value	106	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	13	0
Derivative Liability, Estimated Fair Value	3	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	126	198
Derivative Liability, Estimated Fair Value	103	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	2,003	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	2,003	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	2,003	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	444	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	444	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	444	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	18,945	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	18,945	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	18,945	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	4,090	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	4,090	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	4,090	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	82	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	82	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	82	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	658	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	658	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	655	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
Commercial Real Estate
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Servicing Asset at Fair value. Amount	97	81	$ 78	$ 62
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	81
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	97	81
Residential Mortgage
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Servicing Asset at Fair value. Amount	1,007	906	$ 812	$ 418
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	1,007	906
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	$ 1,007	$ 906

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Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Fair value, before effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets elected not to be offset. Excludes assets not subject to a master netting arrangement.

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Fair value of security sold but not yet purchased.

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