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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, 2025	Jun. 30, 2025	Dec. 31, 2024	Sep. 30, 2024	Jun. 30, 2024	Dec. 31, 2023
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt securities available for sale	$ 26,886		$ 26,224
Servicing Asset at Fair Value, Amount	976		1,007
Derivative Asset, Estimated Fair Value	1,408		1,816
Derivative Liability, Estimated Fair Value	1,497		2,551
Recurring Fair Value Measurements
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt securities available for sale	26,886		26,224
Loans held for sale	267		234
Marketable Equity Securities carried at fair value	699		819
Derivative Asset, Estimated Fair Value	1,408		1,816
Derivative Liability, Estimated Fair Value	1,497		2,551
Security Sold Short, Fair Value	17		147
Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans held for sale	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	2,266		2,003
Loans held for sale	0		0
Marketable Equity Securities carried at fair value	699		819
Derivative Asset, Estimated Fair Value	1		13
Derivative Liability, Estimated Fair Value	0		3
Security Sold Short, Fair Value	17		147
Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans held for sale	251		360
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	24,615		24,218
Loans held for sale	267		234
Marketable Equity Securities carried at fair value	0		0
Derivative Asset, Estimated Fair Value	1,399		1,798
Derivative Liability, Estimated Fair Value	1,497		2,548
Security Sold Short, Fair Value	0		0
Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans held for sale	55		0
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	5		3
Loans held for sale	0		0
Marketable Equity Securities carried at fair value	0		0
Derivative Asset, Estimated Fair Value	8		5
Derivative Liability, Estimated Fair Value	0		0
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	1,223		1,634
Derivative Liability, Estimated Fair Value	1,345		2,411
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	1,223		1,634
Derivative Liability, Estimated Fair Value	1,345		2,411
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	22		35
Derivative Liability, Estimated Fair Value	9		30
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	14		30
Derivative Liability, Estimated Fair Value	9		30
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	8		5
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		8
Derivative Liability, Estimated Fair Value	3		4
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		8
Derivative Liability, Estimated Fair Value	3		4
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	155		139
Derivative Liability, Estimated Fair Value	140		106
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	1		13
Derivative Liability, Estimated Fair Value	0		3
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	154		126
Derivative Liability, Estimated Fair Value	140		103
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		0
U.S. Treasury securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt securities available for sale	2,266		2,003
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	2,266		2,003
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	2,266		2,003
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	610		444
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	610		444
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	610		444
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	18,719		18,945
Residential agency | Recurring Fair Value Measurements
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt securities available for sale	18,719		18,945
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	18,719		18,945
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	4,742		4,090
Commercial agency | Recurring Fair Value Measurements
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt securities available for sale	4,742		4,090
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	4,742		4,090
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	83		82
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	83		82
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	83		82
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	464		658
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	464		658
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	459		655
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	5		3
Residential Mortgage
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Servicing Asset at Fair Value, Amount	976	$ 988	1,007	$ 971	$ 1,020	$ 906
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	976		1,007
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	976		1,007
Commercial Real Estate
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Servicing Asset at Fair Value, Amount	91	$ 93	97	$ 87	$ 90	$ 81
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
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	$ 91		$ 97

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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, before effects of master netting arrangements, of a financial liability or 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 liabilities elected not to be offset. Excludes liabilities not subject to a master netting arrangement.

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Cost of investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI). Excludes equity method investment and investment in equity security without readily determinable fair value.

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