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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, 2024 | Dec. 31, 2023
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Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Debt securities available for sale | $ 28,537 | $ 28,104
Residential mortgage servicing rights | 1,020 | 906
Derivative Asset, Estimated Fair Value | 2,093 | 2,105
Derivative Liability, Estimated Fair Value | 2,936 | 2,691
Recurring Fair Value Measurements |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Debt securities available for sale | 28,537 | 28,104
Loans held for sale | 278 | 201
Marketable Equity Securities carried at fair value | 1,100 | 813
Residential mortgage servicing rights | 1,020 | 906
Derivative Asset, Estimated Fair Value | 2,093 | 2,105
Derivative Liability, Estimated Fair Value | 2,936 | 2,691
Level 1 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Debt securities available for sale | 1,390 | 1,223
Loans held for sale | 0 | 0
Derivative Asset, Estimated Fair Value | 0 | 0
Derivative Liability, Estimated Fair Value | 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 | 1,390 | 1,223
Loans held for sale | 0 | 0
Marketable Equity Securities carried at fair value | 1,100 | 813
Residential mortgage servicing rights | 0 | 0
Derivative Asset, Estimated Fair Value | 0 | 0
Derivative Liability, Estimated Fair Value | 0 | 0
Level 2 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Debt securities available for sale | 27,144 | 26,880
Loans held for sale | 552 | 397
Derivative Asset, Estimated Fair Value | 2,084 | 2,101
Derivative Liability, Estimated Fair Value | 2,936 | 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 | 27,144 | 26,880
Loans held for sale | 278 | 201
Marketable Equity Securities carried at fair value | 0 | 0
Residential mortgage servicing rights | 0 | 0
Derivative Asset, Estimated Fair Value | 2,084 | 2,101
Derivative Liability, Estimated Fair Value | 2,936 | 2,690
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 | 9 | 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
Residential mortgage servicing rights | 1,020 | 906
Derivative Asset, Estimated Fair Value | 9 | 4
Derivative Liability, Estimated Fair Value | 0 | 1
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 | 1,893 | 1,813
Derivative Liability, Estimated Fair Value | 2,771 | 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 | 1,893 | 1,813
Derivative Liability, Estimated Fair Value | 2,771 | 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 | 69 | 87
Derivative Liability, Estimated Fair Value | 57 | 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 | 60 | 83
Derivative Liability, Estimated Fair Value | 57 | 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 | 9 | 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 | 9 | 7
Derivative Liability, Estimated Fair Value | 2 | 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 | 9 | 7
Derivative Liability, Estimated Fair Value | 2 | 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
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 | 122 | 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 | 0 | 0
Derivative Liability, Estimated Fair Value | 0 | 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 | 122 | 198
Derivative Liability, Estimated Fair Value | 106 | 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 | 1,390 | 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 | 1,390 | 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 | 1,390 | 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 | 512 | 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 | 512 | 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 | 512 | 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 | 19,832 | 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 | 19,832 | 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 | 19,832 | 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 | 5,800 | 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 | 5,800 | 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 | 5,800 | 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 | 81 | 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 | 81 | 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 | 81 | 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 | 920 | 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 | 920 | 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 | 917 | 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

X
- Definition Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 103 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482078/820-10-55-103 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 100 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482078/820-10-55-100 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (bbb)(2)(i) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 4: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (bbb)(2) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 5: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (bbb)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 7: http://www.xbrl.org/2003/role/disclosureRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (aa) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481800/320-10-50-2 Reference 8: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481830/320-10-45-1 Reference 9: http://www.xbrl.org/2003/role/disclosureRef -Topic 942 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(6)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478546/942-210-S99-1 Reference 10: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 30 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479130/326-30-45-1 + Details
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