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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, 2025	Mar. 31, 2025	Dec. 31, 2024	Jun. 30, 2024	Mar. 31, 2024	Dec. 31, 2023
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt securities available for sale	$ 26,333		$ 26,224
Servicing Asset at Fair Value, Amount	988		1,007
Derivative Asset, Estimated Fair Value	1,496		1,816
Derivative Liability, Estimated Fair Value	1,682		2,551
Recurring Fair Value Measurements
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt securities available for sale	26,333		26,224
Loans held for sale	286		234
Marketable Equity Securities carried at fair value	913		819
Derivative Asset, Estimated Fair Value	1,496		1,816
Derivative Liability, Estimated Fair Value	1,682		2,551
Security Sold Short, Fair Value	91		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	2,105		2,003
Loans held for sale	0		0
Marketable Equity Securities carried at fair value	913		819
Derivative Asset, Estimated Fair Value	4		13
Derivative Liability, Estimated Fair Value	4		3
Security Sold Short, Fair Value	91		147
Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans held for sale	271		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	24,225		24,218
Loans held for sale	286		234
Marketable Equity Securities carried at fair value	0		0
Derivative Asset, Estimated Fair Value	1,483		1,798
Derivative Liability, Estimated Fair Value	1,678		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	38		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	3		3
Loans held for sale	0		0
Marketable Equity Securities carried at fair value	0		0
Derivative Asset, Estimated Fair Value	9		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	1,249		1,634
Derivative Liability, Estimated Fair Value	1,464		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	1,249		1,634
Derivative Liability, Estimated Fair Value	1,464		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	31		35
Derivative Liability, Estimated Fair Value	15		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	22		30
Derivative Liability, Estimated Fair Value	15		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	9		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	10		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	10		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	206		139
Derivative Liability, Estimated Fair Value	200		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	4		13
Derivative Liability, Estimated Fair Value	4		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	202		126
Derivative Liability, Estimated Fair Value	196		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
U.S. Treasury securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt securities available for sale	2,105		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	2,105		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	2,105		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	487		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	487		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	487		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	18,556		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	18,556		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	18,556		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	4,536		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	4,536		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	4,536		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	564		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	564		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	561		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	3		3
Residential Mortgage
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Servicing Asset at Fair Value, Amount	988	$ 979	1,007	$ 1,020	$ 1,026	$ 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	988		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	988		1,007
Commercial Real Estate
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Servicing Asset at Fair Value, Amount	93	$ 94	97	$ 90	$ 88	$ 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	93		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	$ 93		$ 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 of security sold but not yet purchased.

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