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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, 2022 | Dec. 31, 2021
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Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Debt securities available for sale |  | $ 27,933 |  | $ 28,481
Residential mortgage servicing rights |  | 812 |  | 418
Derivative Assets | [1] | 105 |  | 412
Derivative Liabilities | [1] | 1,453 |  | 80
Recurring Fair Value Measurements [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Debt securities available for sale |  | 27,933 |  | 28,481
Loans held for sale |  | 196 |  | 783
Marketable Equity Securities carried at fair value |  | 529 |  | 464
Residential mortgage servicing rights |  | 812 |  | 418
Derivative Assets | [2] | 2,609 |  | 1,111
Derivative Liabilities | [2] | 3,378 |  | 1,012
Level 1 [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Debt securities available for sale |  | 1,187 |  | 1,132
Loans held for sale |  | 0 |  | 0
Derivative Assets |  | 3 |  | 0
Derivative Liabilities |  | 2 |  | 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 |  | 1,187 |  | 1,132
Loans held for sale |  | 0 |  | 0
Marketable Equity Securities carried at fair value |  | 529 |  | 464
Residential mortgage servicing rights |  | 0 |  | 0
Derivative Assets | [2] | 3 |  | 0
Derivative Liabilities | [2] | 2 |  | 0
Level 2 [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Debt securities available for sale |  | 26,744 |  | 27,347
Loans held for sale |  | 335 |  | 899
Derivative Assets |  | 2,603 |  | 1,098
Derivative Liabilities |  | 3,375 |  | 1,009
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 |  | 26,744 |  | 27,347
Loans held for sale |  | 177 |  | 693
Marketable Equity Securities carried at fair value |  | 0 |  | 0
Residential mortgage servicing rights |  | 0 |  | 0
Derivative Assets | [2] | 2,603 |  | 1,098
Derivative Liabilities | [2] | 3,375 |  | 1,009
Level 3 [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Debt securities available for sale |  | 2 |  | 2
Loans held for sale |  | 19 |  | 104
Derivative Assets |  | 3 |  | 13
Derivative Liabilities |  | 1 |  | 3
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 | [3] | 2
Loans held for sale |  | 19 |  | 90
Marketable Equity Securities carried at fair value |  | 0 |  | 0
Residential mortgage servicing rights |  | 812 |  | 418
Derivative Assets | [2] | 3 | [3] | 13
Derivative Liabilities | [2] | 1 | [3] | 3
Interest Rate Swaps [Member] | Recurring Fair Value Measurements [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Derivative Assets | [2] | 2,335 |  | 919
Derivative Liabilities | [2] | 3,161 |  | 855
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 Assets | [2] | 0 |  | 0
Derivative Liabilities | [2] | 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 Assets | [2] | 2,335 |  | 919
Derivative Liabilities | [2] | 3,161 |  | 855
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 Assets | [2] | 0 |  | 0
Derivative Liabilities | [2] | 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 Assets | [2] | 94 |  | 48
Derivative Liabilities | [2] | 85 |  | 19
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 Assets | [2] | 0 |  | 0
Derivative Liabilities | [2] | 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 Assets | [2] | 91 |  | 36
Derivative Liabilities | [2] | 85 |  | 19
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 Assets | [2],[3] | 3 |  | 12
Derivative Liabilities | [2] | 0 |  | 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 Assets | [2] | 8 |  | 11
Derivative Liabilities | [2] | 5 |  | 3
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 Assets | [2] | 0 |  | 0
Derivative Liabilities | [2] | 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 Assets | [2] | 8 |  | 11
Derivative Liabilities | [2] | 5 |  | 3
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 Assets | [2] | 0 |  | 0
Derivative Liabilities | [2] | 0 |  | 0
Other Contracts [Member] | Recurring Fair Value Measurements [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Derivative Assets | [2] | 172 |  | 133
Derivative Liabilities | [2] | 127 |  | 135
Other Contracts [Member] | Level 1 [Member] | Recurring Fair Value Measurements [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Derivative Assets | [2] | 3 |  | 0
Derivative Liabilities | [2] | 2 |  | 0
Other Contracts [Member] | Level 2 [Member] | Recurring Fair Value Measurements [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Derivative Assets | [2] | 169 |  | 132
Derivative Liabilities | [2] | 124 |  | 132
Other Contracts [Member] | Level 3 [Member] | Recurring Fair Value Measurements [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Derivative Assets | [2],[3] | 0 |  | 1
Derivative Liabilities | [2],[3] | 1 |  | 3
US Treasury Securities [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Debt securities available for sale |  | 1,187 |  | 1,132
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 |  | 1,187 |  | 1,132
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 |  | 1,187 |  | 1,132
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] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Debt securities available for sale |  | 836 |  | 92
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 |  | 836 |  | 92
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 |  | 836 |  | 92
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 |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Debt securities available for sale |  | 2 |  | 4
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 |  | 2 |  | 4
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 |  | 2 |  | 4
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 |  | 16,954 |  | 18,962
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 |  | 16,954 |  | 18,962
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 |  | 16,954 |  | 18,962
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 |  | 1
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 |  | 1
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 | [3] | 1 |  | 1
Commercial Agency [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Debt securities available for sale |  | 7,613 |  | 6,373
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 |  | 7,613 |  | 6,373
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 |  | 7,613 |  | 6,373
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 |  | 186 |  | 536
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 |  | 186 |  | 536
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 |  | 186 |  | 536
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 |  | 1,154 |  | 1,381
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 |  | 1,154 |  | 1,381
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 |  | 1,153 |  | 1,380
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 | [3] | $ 1 |  | $ 1
[1] | Derivatives in a gain position are recorded as other assets and derivatives in a loss position are recorded as other liabilities on the consolidated balance sheets.
[2] | As permitted under U.S. GAAP, variation margin collateral payments made or received for derivatives that are centrally cleared are legally characterized as settled. As such, these derivative assets and derivative liabilities and the related variation margin collateral are presented on a net basis on the balance sheet.
[3] | All following disclosures related to Level 3 recurring assets do not include those deemed to be immaterial.

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- Definition Fair value, after the 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 not subject to a master netting arrangement and not elected to be offset. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 10 -URI https://asc.fasb.org/extlink&oid=99393222&loc=SL20226008-175313 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 22 -URI https://asc.fasb.org/extlink&oid=99393222&loc=SL20226052-175313 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -URI https://asc.fasb.org/extlink&oid=123594938&loc=d3e13433-108611 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (c) -URI https://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 + Details
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- Definition Fair value, after the 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 not subject to a master netting arrangement and not elected to be offset. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (c) -URI https://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 10 -URI https://asc.fasb.org/extlink&oid=99393222&loc=SL20226008-175313 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -URI https://asc.fasb.org/extlink&oid=123594938&loc=d3e13433-108611 Reference 4: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 22 -URI https://asc.fasb.org/extlink&oid=99393222&loc=SL20226052-175313 + Details
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