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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 | Mar. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Trading securities | $ 1,076 | $ 1,176
Loans held-for-sale | 449 | 405
Loans held for investment | 17 | 16
Securities available-for-sale | 8,351 | 8,047
Recurring |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Loans held-for-sale | 449 | 405
Loans held for investment | 17 | 16
Securities available-for-sale | 8,351 | 8,047
Total other assets | 708 | 912
Total assets | 10,601 | 10,556
Total other liabilities | 267 | 149
Total liabilities | 721 | 502
Level 1 | Recurring |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Loans held-for-sale | 0 | 0
Loans held for investment | 0 | 0
Securities available-for-sale | 0 | 0
Total other assets | 292 | 206
Total assets | 292 | 206
Total other liabilities | 116 | 71
Total liabilities | 116 | 71
Level 2 | Recurring |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Loans held-for-sale | 437 | 393
Loans held for investment | 0 | 0
Securities available-for-sale | 8,329 | 8,015
Total other assets | 416 | 706
Total assets | 10,258 | 10,290
Total other liabilities | 130 | 64
Total liabilities | 584 | 417
Level 3 | Recurring |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Loans held-for-sale | 12 | 12
Loans held for investment | 17 | 16
Securities available-for-sale | 22 | 32
Total other assets | 0 | 0
Total assets | 51 | 60
Total other liabilities | 21 | 14
Total liabilities | 21 | 14
Deferred compensation mutual funds | Recurring |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Total other assets | 122 | 118
Deferred compensation mutual funds | Level 1 | Recurring |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Total other assets | 122 | 118
Deferred compensation mutual funds | Level 2 | Recurring |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Total other assets | 0 | 0
Deferred compensation mutual funds | Level 3 | Recurring |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Total other assets | 0 | 0
Equity, mutual funds, and other | Recurring |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Total other assets | 25 | 25
Equity, mutual funds, and other | Level 1 | Recurring |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Total other assets | 25 | 25
Equity, mutual funds, and other | Level 2 | Recurring |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Total other assets | 0 | 0
Equity, mutual funds, and other | Level 3 | Recurring |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Total other assets | 0 | 0
Derivatives, forwards and futures | Recurring |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Total other assets | 145 | 63
Total other liabilities | 116 | 71
Derivatives, forwards and futures | Level 1 | Recurring |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Total other assets | 145 | 63
Total other liabilities | 116 | 71
Derivatives, forwards and futures | Level 2 | Recurring |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Total other assets | 0 | 0
Total other liabilities | 0 | 0
Derivatives, forwards and futures | Level 3 | Recurring |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Total other assets | 0 | 0
Total other liabilities | 0 | 0
Derivatives, interest rate contracts | Recurring |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Total other assets | 414 | 702
Total other liabilities | 128 | 60
Derivatives, interest rate contracts | Level 1 | Recurring |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Total other assets | 0 | 0
Total other liabilities | 0 | 0
Derivatives, interest rate contracts | Level 2 | Recurring |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Total other assets | 414 | 702
Total other liabilities | 128 | 60
Derivatives, interest rate contracts | Level 3 | Recurring |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Total other assets | 0 | 0
Total other liabilities | 0 | 0
Derivatives, other | Recurring |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Total other assets | 2 | 4
Total other liabilities | 23 | 18
Derivatives, other | Level 1 | Recurring |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Total other assets | 0 | 0
Total other liabilities | 0 | 0
Derivatives, other | Level 2 | Recurring |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Total other assets | 2 | 4
Total other liabilities | 2 | 4
Derivatives, other | Level 3 | Recurring |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Total other assets | 0 | 0
Total other liabilities | 21 | 14
U.S. treasuries | Recurring |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Securities available-for-sale | 610 | 613
U.S. treasuries | Level 1 | Recurring |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Securities available-for-sale | 0 | 0
U.S. treasuries | Level 2 | Recurring |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Securities available-for-sale | 610 | 613
U.S. treasuries | Level 3 | Recurring |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Securities available-for-sale | 0 | 0
Government agency issued MBS | Recurring |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Securities available-for-sale | 4,038 | 3,812
Government agency issued MBS | Level 1 | Recurring |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Securities available-for-sale | 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 | 4,038 | 3,812
Government agency issued MBS | Level 3 | Recurring |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Securities available-for-sale | 0 | 0
Government agency issued CMO | Recurring |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Securities available-for-sale | 2,441 | 2,406
Government agency issued CMO | Level 1 | Recurring |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Securities available-for-sale | 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 | 2,441 | 2,406
Government agency issued CMO | Level 3 | Recurring |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Securities available-for-sale | 0 | 0
Other U.S. government agencies | Recurring |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Securities available-for-sale | 725 | 684
Other U.S. government agencies | Level 1 | Recurring |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Securities available-for-sale | 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 | 725 | 684
Other U.S. government agencies | Level 3 | Recurring |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Securities available-for-sale | 0 | 0
States and municipalities | Recurring |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Securities available-for-sale | 475 | 460
States and municipalities | Level 1 | Recurring |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Securities available-for-sale | 0 | 0
States and municipalities | Level 2 | Recurring |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Securities available-for-sale | 475 | 460
States and municipalities | Level 3 | Recurring |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Securities available-for-sale | 0 | 0
Corporate and other debt | Recurring |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Securities available-for-sale | 40 | 40
Corporate and other debt | Level 1 | Recurring |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Securities available-for-sale | 0 | 0
Corporate and other debt | Level 2 | Recurring |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Securities available-for-sale | 40 | 40
Corporate and other debt | Level 3 | Recurring |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Securities available-for-sale | 0 | 0
Interest- only strips- AFS | Recurring |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Securities available-for-sale | 22 | 32
Interest- only strips- AFS | Level 1 | Recurring |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Securities available-for-sale | 0 | 0
Interest- only strips- AFS | Level 2 | Recurring |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Securities available-for-sale | 0 | 0
Interest- only strips- AFS | Level 3 | Recurring |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Securities available-for-sale | 22 | 32
Specialty Banking | Recurring |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Trading securities | 1,076 | 1,176
Total trading liabilities - fixed income | 454 | 353
Specialty Banking | Level 1 | Recurring |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Trading securities | 0 | 0
Total trading liabilities - fixed income | 0 | 0
Specialty Banking | Level 2 | Recurring |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Trading securities | 1,076 | 1,176
Total trading liabilities - fixed income | 454 | 353
Specialty Banking | Level 3 | Recurring |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Trading securities | 0 | 0
Total trading liabilities - fixed income | 0 | 0
Specialty Banking | U.S. treasuries | Recurring |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Trading securities | 51 | 81
Total trading liabilities - fixed income | 361 | 307
Specialty Banking | U.S. treasuries | Level 1 | Recurring |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Trading securities | 0 | 0
Total trading liabilities - fixed income | 0 | 0
Specialty Banking | U.S. treasuries | Level 2 | Recurring |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Trading securities | 51 | 81
Total trading liabilities - fixed income | 361 | 307
Specialty Banking | U.S. treasuries | Level 3 | Recurring |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Trading securities | 0 | 0
Total trading liabilities - fixed income | 0 | 0
Specialty Banking | Government agency issued MBS | Recurring |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Trading securities | 384 | 633
Total trading liabilities - fixed income | 8 | 3
Specialty Banking | Government agency issued MBS | Level 1 | Recurring |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Trading securities | 0 | 0
Total trading liabilities - fixed income | 0 | 0
Specialty Banking | Government agency issued MBS | Level 2 | Recurring |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Trading securities | 384 | 633
Total trading liabilities - fixed income | 8 | 3
Specialty Banking | Government agency issued MBS | Level 3 | Recurring |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Trading securities | 0 | 0
Total trading liabilities - fixed income | 0 | 0
Specialty Banking | Government agency issued CMO | Recurring |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Trading securities | 190 | 212
Specialty Banking | Government agency issued CMO | Level 1 | Recurring |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Trading securities | 0 | 0
Specialty Banking | Government agency issued CMO | Level 2 | Recurring |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Trading securities | 190 | 212
Specialty Banking | Government agency issued CMO | Level 3 | Recurring |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Trading securities | 0 | 0
Specialty Banking | Other U.S. government agencies | Recurring |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Trading securities | 237 | 62
Total trading liabilities - fixed income | 20 |
Specialty Banking | Other U.S. government agencies | Level 1 | Recurring |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Trading securities | 0 | 0
Total trading liabilities - fixed income | 0 |
Specialty Banking | Other U.S. government agencies | Level 2 | Recurring |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Trading securities | 237 | 62
Total trading liabilities - fixed income | 20 |
Specialty Banking | Other U.S. government agencies | Level 3 | Recurring |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Trading securities | 0 | 0
Total trading liabilities - fixed income | 0 |
Specialty Banking | States and municipalities | Recurring |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Trading securities | 10 | 7
Specialty Banking | States and municipalities | Level 1 | Recurring |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Trading securities | 0 | 0
Specialty Banking | States and municipalities | Level 2 | Recurring |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Trading securities | 10 | 7
Specialty Banking | States and municipalities | Level 3 | Recurring |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Trading securities | 0 | 0
Specialty Banking | Corporate and other debt | Recurring |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Trading securities | 204 | 181
Total trading liabilities - fixed income | 65 | 43
Specialty Banking | Corporate and other debt | Level 1 | Recurring |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Trading securities | 0 | 0
Total trading liabilities - fixed income | 0 | 0
Specialty Banking | Corporate and other debt | Level 2 | Recurring |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Trading securities | 204 | 181
Total trading liabilities - fixed income | 65 | 43
Specialty Banking | Corporate and other debt | Level 3 | Recurring |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Trading securities | 0 | 0
Total trading liabilities - fixed income | $ 0 | $ 0

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- Definition Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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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). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(6)) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=121558606&loc=SL82898722-210454 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121553693&loc=d3e26610-111562 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=121645371&loc=d3e27161-111563 + Details
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- Definition 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. + References No definition available. + Details
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- Definition Fair value of financial and nonfinancial obligations. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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- Definition Fair value portion of loan receivable, including, but not limited to, mortgage loans held for investment, finance receivables held for investment, policy loans on insurance contracts. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -URI http://asc.fasb.org/subtopic&trid=2196772 + Details
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- Definition Fair value portion of liabilities pertaining to principal and customer trading transactions, or which may be incurred with the objective of generating a profit from short-term fluctuations in price as part of an entity's market-making, hedging and proprietary trading. Examples include, but are not limited to, short positions in securities, derivatives and commodities. + References No definition available. + Details
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