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Fair Value Measurements (Schedule Of Assets And Liabilities At Fair Value Measured On A Recurring Basis And Non-Recurring Basis) (Details) - USD ($)	Jun. 30, 2022	Dec. 31, 2021
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt securities available for sale	$ 29,052,000,000	$ 28,481,000,000
Loans held for sale, at fair value	369,000,000	783,000,000
Residential mortgage servicing rights	770,000,000	418,000,000
Derivative Asset, Fair Value, Gross Asset	1,889,000,000	1,111,000,000
Derivative Liabilities, Fair Value, Gross Liability	2,426,000,000	1,012,000,000
Recurring Fair Value Measurements [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt securities available for sale	29,052,000,000	28,481,000,000
Loans held for sale, at fair value	369,000,000	783,000,000
Marketable Equity Securities	583,000,000	464,000,000
Residential mortgage servicing rights	770,000,000	418,000,000
Derivative Asset, Fair Value, Gross Asset	1,889,000,000	1,111,000,000
Derivative Liabilities, Fair Value, Gross Liability	2,426,000,000	1,012,000,000
Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt securities available for sale	1,252,000,000	1,132,000,000
Loans held for sale, at fair value	0	0
Derivative Asset, Fair Value, Gross Asset	0	0
Derivative Liabilities, Fair Value, Gross Liability	0	0
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	1,252,000,000	1,132,000,000
Loans held for sale, at fair value	0	0
Marketable Equity Securities	583,000,000	464,000,000
Residential mortgage servicing rights	0	0
Derivative Asset, Fair Value, Gross Asset	0	0
Derivative Liabilities, Fair Value, Gross Liability	0	0
Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt securities available for sale	27,798,000,000	27,347,000,000
Loans held for sale, at fair value	552,000,000	899,000,000
Derivative Asset, Fair Value, Gross Asset	1,879,000,000	1,098,000,000
Derivative Liabilities, Fair Value, Gross Liability	2,422,000,000	1,009,000,000
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	27,798,000,000	27,347,000,000
Loans held for sale, at fair value	312,000,000	693,000,000
Marketable Equity Securities	0	0
Residential mortgage servicing rights	0	0
Derivative Asset, Fair Value, Gross Asset	1,879,000,000	1,098,000,000
Derivative Liabilities, Fair Value, Gross Liability	2,422,000,000	1,009,000,000
Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt securities available for sale	2,000,000	2,000,000
Loans held for sale, at fair value	60,000,000	104,000,000
Derivative Asset, Fair Value, Gross Asset	10,000,000	13,000,000
Derivative Liabilities, Fair Value, Gross Liability	4,000,000	3,000,000
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	2,000,000	2,000,000
Loans held for sale, at fair value	57,000,000	90,000,000
Marketable Equity Securities	0	0
Residential mortgage servicing rights	770,000,000	418,000,000
Derivative Asset, Fair Value, Gross Asset	10,000,000	13,000,000
Derivative Liabilities, Fair Value, Gross Liability	4,000,000	3,000,000
Interest Rate Swaps [Member] | Recurring Fair Value Measurements [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Asset, Fair Value, Gross Asset	1,490,000,000	919,000,000
Derivative Liabilities, Fair Value, Gross Liability	2,091,000,000	855,000,000
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 Asset, Fair Value, Gross Asset	0	0
Derivative Liabilities, Fair Value, Gross Liability	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 Asset, Fair Value, Gross Asset	1,490,000,000	919,000,000
Derivative Liabilities, Fair Value, Gross Liability	2,091,000,000	855,000,000
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 Asset, Fair Value, Gross Asset	0	0
Derivative Liabilities, Fair Value, Gross Liability	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 Asset, Fair Value, Gross Asset	87,000,000	48,000,000
Derivative Liabilities, Fair Value, Gross Liability	64,000,000	19,000,000
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 Asset, Fair Value, Gross Asset	0	0
Derivative Liabilities, Fair Value, Gross Liability	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 Asset, Fair Value, Gross Asset	77,000,000	36,000,000
Derivative Liabilities, Fair Value, Gross Liability	63,000,000	19,000,000
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 Asset, Fair Value, Gross Asset	10,000,000	12,000,000
Derivative Liabilities, Fair Value, Gross Liability	1,000,000	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 Asset, Fair Value, Gross Asset	11,000,000	11,000,000
Derivative Liabilities, Fair Value, Gross Liability	4,000,000	3,000,000
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 Asset, Fair Value, Gross Asset	0	0
Derivative Liabilities, Fair Value, Gross Liability	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 Asset, Fair Value, Gross Asset	11,000,000	11,000,000
Derivative Liabilities, Fair Value, Gross Liability	4,000,000	3,000,000
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 Asset, Fair Value, Gross Asset	0	0
Derivative Liabilities, Fair Value, Gross Liability	0	0
Other Contract [Member] | Recurring Fair Value Measurements [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Asset, Fair Value, Gross Asset	301,000,000	133,000,000
Derivative Liabilities, Fair Value, Gross Liability	267,000,000	135,000,000
Other Contract [Member] | Level 1 [Member] | Recurring Fair Value Measurements [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Asset, Fair Value, Gross Asset	0	0
Derivative Liabilities, Fair Value, Gross Liability	0	0
Other Contract [Member] | Level 2 [Member] | Recurring Fair Value Measurements [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Asset, Fair Value, Gross Asset	301,000,000	132,000,000
Derivative Liabilities, Fair Value, Gross Liability	264,000,000	132,000,000
Other Contract [Member] | Level 3 [Member] | Recurring Fair Value Measurements [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Asset, Fair Value, Gross Asset	0	1,000,000
Derivative Liabilities, Fair Value, Gross Liability	3,000,000	3,000,000
US Treasury Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt securities available for sale	1,252,000,000	1,132,000,000
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	1,252,000,000	1,132,000,000
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	1,252,000,000	1,132,000,000
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] | Recurring Fair Value Measurements [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt securities available for sale	683,000,000	92,000,000
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	683,000,000	92,000,000
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 | Recurring Fair Value Measurements [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt securities available for sale	3,000,000	4,000,000
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	3,000,000	4,000,000
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	19,007,000,000	18,962,000,000
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	19,007,000,000	18,962,000,000
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	19,007,000,000	18,962,000,000
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	1,000,000	1,000,000
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	1,000,000	1,000,000
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	1,000,000	1,000,000
Commercial Agency [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt securities available for sale	6,607,000,000	6,373,000,000
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	6,607,000,000	6,373,000,000
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	6,607,000,000	6,373,000,000
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	315,000,000	536,000,000
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	315,000,000	536,000,000
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	315,000,000	536,000,000
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	1,184,000,000	1,381,000,000
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	1,184,000,000	1,381,000,000
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	1,183,000,000	1,380,000,000
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	$ 1,000,000	$ 1,000,000

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- Definition

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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Amount of investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI), classified as current.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Fair value portion of loans held-for-sale including, but not limited to, mortgage loans and finance receivables.

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- Definition

Fair value of an asset representing net future revenue from contractually specified servicing fees, late charges, and other ancillary revenues, in excess of future costs related to servicing arrangements.

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Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 860
-SubTopic 50
-Section 45
-Paragraph 2
-Subparagraph (a)
-URI https://asc.fasb.org/extlink&oid=6469459&loc=d3e122501-111745

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