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Fair Value of Assets and Liabilities - Schedule of Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details) - USD ($) $ in Millions | Sep. 30, 2024 | Dec. 31, 2023
--- | --- | ---
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Trading securities | $ 1,549 | $ 1,412
Loans held-for-sale | 87 | 68
Securities available for sale at fair value | 8,248 | 8,391
Recurring |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Loans held-for-sale | 87 | 68
Securities available for sale at fair value | 8,248 | 8,391
Total other assets | 582 | 713
Total assets | 10,466 | 10,584
Total other liabilities | 521 | 699
Total liabilities | 1,288 | 1,208
Recurring | Deferred compensation mutual funds |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Total other assets | 110 | 102
Recurring | Equity, mutual funds, and other |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Total other assets | 35 | 34
Recurring | Derivatives, forwards and futures |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Total other assets | 6 | 9
Total other liabilities | 5 | 10
Recurring | Derivatives, interest rate contracts |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Total other assets | 431 | 568
Total other liabilities | 484 | 666
Recurring | Derivatives, other |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Total other liabilities | 32 | 23
Level 1 | Recurring |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Loans held-for-sale | 0 | 0
Securities available for sale at fair value | 0 | 0
Total other assets | 151 | 145
Total assets | 151 | 145
Total other liabilities | 5 | 10
Total liabilities | 5 | 10
Level 1 | Recurring | Deferred compensation mutual funds |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Total other assets | 110 | 102
Level 1 | Recurring | Equity, mutual funds, and other |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Total other assets | 35 | 34
Level 1 | Recurring | Derivatives, forwards and futures |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Total other assets | 6 | 9
Total other liabilities | 5 | 10
Level 1 | Recurring | Derivatives, interest rate contracts |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Total other assets | 0 | 0
Total other liabilities | 0 | 0
Level 1 | Recurring | Derivatives, other |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Total other liabilities | 0 | 0
Level 2 | Recurring |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Loans held-for-sale | 71 | 42
Securities available for sale at fair value | 8,248 | 8,391
Total other assets | 431 | 568
Total assets | 10,282 | 10,400
Total other liabilities | 484 | 666
Total liabilities | 1,251 | 1,175
Level 2 | Recurring | Deferred compensation mutual funds |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Total other assets | 0 | 0
Level 2 | Recurring | Equity, mutual funds, and other |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Total other assets | 0 | 0
Level 2 | Recurring | Derivatives, forwards and futures |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Total other assets | 0 | 0
Total other liabilities | 0 | 0
Level 2 | Recurring | Derivatives, interest rate contracts |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Total other assets | 431 | 568
Total other liabilities | 484 | 666
Level 2 | Recurring | Derivatives, other |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Total other liabilities | 0 | 0
Level 3 | Recurring |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Loans held-for-sale | 16 | 26
Securities available for sale at fair value | 0 | 0
Total other assets | 0 | 0
Total assets | 33 | 39
Total other liabilities | 32 | 23
Total liabilities | 32 | 23
Level 3 | Recurring | Deferred compensation mutual funds |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Total other assets | 0 | 0
Level 3 | Recurring | Equity, mutual funds, and other |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Total other assets | 0 | 0
Level 3 | Recurring | Derivatives, forwards and futures |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Total other assets | 0 | 0
Total other liabilities | 0 | 0
Level 3 | Recurring | Derivatives, interest rate contracts |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Total other assets | 0 | 0
Total other liabilities | 0 | 0
Level 3 | Recurring | Derivatives, other |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Total other liabilities | 32 | 23
Specialty Banking | Recurring |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Trading securities | 1,549 | 1,412
Total trading liabilities | 767 | 509
Specialty Banking | Level 1 | Recurring |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Trading securities | 0 | 0
Total trading liabilities | 0 | 0
Specialty Banking | Level 2 | Recurring |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Trading securities | 1,532 | 1,399
Total trading liabilities | 767 | 509
Specialty Banking | Level 3 | Recurring |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Trading securities | 17 | 13
Total trading liabilities | 0 | 0
U.S. treasuries | Specialty Banking | Recurring |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Trading securities | 20 | 3
Total trading liabilities | 667 | 426
U.S. treasuries | Specialty Banking | Level 1 | Recurring |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Trading securities | 0 | 0
Total trading liabilities | 0 | 0
U.S. treasuries | Specialty Banking | Level 2 | Recurring |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Trading securities | 20 | 3
Total trading liabilities | 667 | 426
U.S. treasuries | Specialty Banking | Level 3 | Recurring |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Trading securities | 0 | 0
Total trading liabilities | 0 | 0
Government agency issued MBS | Recurring |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Securities available for sale at fair value | 4,299 | 4,484
Government agency issued MBS | Level 1 | Recurring |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Securities available for sale at fair value | 0 | 0
Government agency issued MBS | Level 2 | Recurring |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Securities available for sale at fair value | 4,299 | 4,484
Government agency issued MBS | Level 3 | Recurring |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Securities available for sale at fair value | 0 | 0
Government agency issued MBS | Specialty Banking | Recurring |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Trading securities | 110 | 114
Total trading liabilities |  | 1
Government agency issued MBS | Specialty Banking | Level 1 | Recurring |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Trading securities | 0 | 0
Total trading liabilities |  | 0
Government agency issued MBS | Specialty Banking | Level 2 | Recurring |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Trading securities | 110 | 114
Total trading liabilities |  | 1
Government agency issued MBS | Specialty Banking | Level 3 | Recurring |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Trading securities | 0 | 0
Total trading liabilities |  | 0
Government agency issued CMO | Recurring |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Securities available for sale at fair value | 2,255 | 2,146
Government agency issued CMO | Level 1 | Recurring |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Securities available for sale at fair value | 0 | 0
Government agency issued CMO | Level 2 | Recurring |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Securities available for sale at fair value | 2,255 | 2,146
Government agency issued CMO | Level 3 | Recurring |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Securities available for sale at fair value | 0 | 0
Government agency issued CMO | Specialty Banking | Recurring |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Trading securities | 317 | 336
Government agency issued CMO | Specialty Banking | Level 1 | Recurring |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Trading securities | 0 | 0
Government agency issued CMO | Specialty Banking | Level 2 | Recurring |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Trading securities | 317 | 336
Government agency issued CMO | Specialty Banking | Level 3 | Recurring |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Trading securities | 0 | 0
Other U.S. government agencies | Recurring |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Securities available for sale at fair value | 1,134 | 1,172
Other U.S. government agencies | Level 1 | Recurring |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Securities available for sale at fair value | 0 | 0
Other U.S. government agencies | Level 2 | Recurring |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Securities available for sale at fair value | 1,134 | 1,172
Other U.S. government agencies | Level 3 | Recurring |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Securities available for sale at fair value | 0 | 0
Other U.S. government agencies | Specialty Banking | Recurring |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Trading securities | 266 | 152
Total trading liabilities | 6 |
Other U.S. government agencies | Specialty Banking | Level 1 | Recurring |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Trading securities | 0 | 0
Total trading liabilities | 0 |
Other U.S. government agencies | Specialty Banking | Level 2 | Recurring |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Trading securities | 266 | 152
Total trading liabilities | 6 |
Other U.S. government agencies | Specialty Banking | Level 3 | Recurring |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Trading securities | 0 | 0
Total trading liabilities | 0 |
States and municipalities | Recurring |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Securities available for sale at fair value | 560 | 589
States and municipalities | Level 1 | Recurring |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Securities available for sale at fair value | 0 | 0
States and municipalities | Level 2 | Recurring |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Securities available for sale at fair value | 560 | 589
States and municipalities | Level 3 | Recurring |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Securities available for sale at fair value | 0 | 0
States and municipalities | Specialty Banking | Recurring |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Trading securities | 67 | 17
States and municipalities | Specialty Banking | Level 1 | Recurring |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Trading securities | 0 | 0
States and municipalities | Specialty Banking | Level 2 | Recurring |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Trading securities | 67 | 17
States and municipalities | Specialty Banking | Level 3 | Recurring |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Trading securities | 0 | 0
Corporate and other debt | Specialty Banking | Recurring |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Trading securities | 751 | 777
Total trading liabilities | 94 | 82
Corporate and other debt | Specialty Banking | Level 1 | Recurring |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Trading securities | 0 | 0
Total trading liabilities | 0 | 0
Corporate and other debt | Specialty Banking | Level 2 | Recurring |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Trading securities | 751 | 777
Total trading liabilities | 94 | 82
Corporate and other debt | Specialty Banking | Level 3 | Recurring |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Trading securities | 0 | 0
Total trading liabilities | 0 | 0
Equity, mutual funds, and other | Specialty Banking | Recurring |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Trading securities | 1 |
Equity, mutual funds, and other | Specialty Banking | Level 1 | Recurring |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Trading securities | 0 |
Equity, mutual funds, and other | Specialty Banking | Level 2 | Recurring |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Trading securities | 1 |
Equity, mutual funds, and other | Specialty Banking | Level 3 | Recurring |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Trading securities | 0 |
Interest-only strips | Specialty Banking | Recurring |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Trading securities | 17 | 13
Interest-only strips | Specialty Banking | Level 1 | Recurring |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Trading securities | 0 | 0
Interest-only strips | Specialty Banking | Level 2 | Recurring |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Trading securities | 0 | 0
Interest-only strips | Specialty Banking | Level 3 | Recurring |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Trading securities | $ 17 | $ 13

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- Definition Fair value portion of asset recognized for present right to economic benefit. + References Reference 1: 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 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 3: 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 + Details
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- Definition Amount excluding accrued interest, 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/2009/role/commonPracticeRef -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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- Definition Fair value portion of loans held-for-sale including, but not limited to, mortgage loans and finance receivables. + References Reference 1: 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 2: 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 3: 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 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 5: 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 + Details
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