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Fair Value (Reconciliation ofLevel 3 Assets and Liabilities) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022
Fair Value Additional Information [Abstract] |  |
Fair Value, Liability, Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] |  | Interest and Dividend Income, Operating, Total noninterest income
Fair Value, Asset, Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] | Interest and Dividend Income, Operating, Total noninterest income | Interest and Dividend Income, Operating, Total noninterest income
Fair Value, Asset, Recurring Basis, Unobservable Input Reconciliation, Asset, Gain (Loss), Statement of Other Comprehensive Income or Comprehensive Income [Extensible Enumeration] | Total noninterest income |
Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] |  | Total noninterest income
Fair Value, Liability, Recurring Basis, Still Held, Unrealized Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] |  | Total noninterest income
Fair Value, Measurements, Recurring | Level 3 |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Beginning Balance | $ 7,252 | $ 5,882
Included in Earnings | 464 | 1,457
Included in Other comprehensive income (b) | (7) | (126)
Purchases | 1,335 | 1,529
Sales | (734) | (816)
Issuances | 73 | 119
Settlements | (876) | (896)
Transfers into Level 3 | 123 | 163
Transfers out of Level 3 | (182) | (60)
Ending Balance | 7,448 | 7,252
Unrealized gains (losses) on assets held on Consolidated Balance Sheet | 404 | 1,250
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Beginning Balance | 421 | 463
Included in Earnings | 322 | 126
Purchases |  | 32
Sales | 5 | 14
Issuances | 455 | 883
Settlements | (805) | (1,097)
Ending Balance | 398 | 421
Unrealized gains or (losses) on liabilities held on Consolidated Balance Sheet | 313 | 128
Fair Value Additional Information [Abstract] |  |
Net gains (losses) included in earnings (realized and unrealized) relating to Level 3 assets and liabilities | 142 | 1,331
Net unrealized gains (losses) relating to Level 3 assets and liabilities | 91 | 1,122
Fair Value, Measurements, Recurring | Level 3 | Residential mortgage-backed Securities |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Beginning Balance | 819 | 1,097
Included in Earnings | 15 | 22
Included in Other comprehensive income (b) | (11) | (108)
Settlements | (127) | (192)
Ending Balance | 696 | 819
Fair Value, Measurements, Recurring | Level 3 | Commercial Mortgage-Backed Securities |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Beginning Balance | 3 | 3
Included in Other comprehensive income (b) | 8 |
Transfers into Level 3 | 92 |
Ending Balance | 103 | 3
Fair Value, Measurements, Recurring | Level 3 | Asset-backed |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Beginning Balance | 124 | 163
Included in Earnings | 1 | 2
Included in Other comprehensive income (b) | (1) | (18)
Settlements | (22) | (23)
Ending Balance | 102 | 124
Fair Value, Measurements, Recurring | Level 3 | Other debt |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Beginning Balance | 55 | 69
Included in Earnings | (1) |
Included in Other comprehensive income (b) | (3) |
Purchases | 6 | 6
Settlements | (5) | (20)
Transfers into Level 3 | 3 |
Ending Balance | 55 | 55
Fair Value, Measurements, Recurring | Level 3 | Loans Held For Sale | Residential Mortgages |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Beginning Balance | 243 | 81
Included in Earnings | 1 | (5)
Purchases | 15 | 226
Sales | (131) | (34)
Settlements | (10) | (13)
Transfers into Level 3 | 7 | 29
Transfers out of Level 3 | (22) | (41)
Ending Balance | 103 | 243
Unrealized gains (losses) on assets held on Consolidated Balance Sheet | 1 | (5)
Fair Value, Measurements, Recurring | Level 3 | Loans Held For Sale | Commercial Mortgages |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Beginning Balance | 33 | 49
Included in Earnings | 1 | (6)
Sales |  |
Settlements | (23) | (10)
Ending Balance | 11 | 33
Unrealized gains (losses) on assets held on Consolidated Balance Sheet |  | (6)
Fair Value, Measurements, Recurring | Level 3 | Debt Securities |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Beginning Balance | 1,001 | 1,332
Included in Earnings | 15 | 24
Included in Other comprehensive income (b) | (7) | (126)
Purchases | 6 | 6
Settlements | (154) | (235)
Transfers into Level 3 | 95 |
Ending Balance | 956 | 1,001
Fair Value, Measurements, Recurring | Level 3 | Loans |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Beginning Balance | 769 | 884
Included in Earnings | 15 | 23
Purchases | 47 | 55
Sales | (2) | (10)
Settlements | (98) | (164)
Transfers into Level 3 | 21 |
Transfers out of Level 3 | (26) | (19)
Ending Balance | 726 | 769
Unrealized gains (losses) on assets held on Consolidated Balance Sheet | 15 | 23
Fair Value, Measurements, Recurring | Level 3 | Equity investments |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Beginning Balance | 1,778 | 1,680
Included in Earnings | 140 | 445
Purchases | 768 | 291
Sales | (600) | (772)
Transfers into Level 3 |  | 134
Transfers out of Level 3 | (134) |
Ending Balance | 1,952 | 1,778
Unrealized gains (losses) on assets held on Consolidated Balance Sheet | 92 | 237
Fair Value, Measurements, Recurring | Level 3 | Mortgage Servicing Rights | Residential Mortgages |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Beginning Balance | 2,310 | 1,078
Included in Earnings | 115 | 509
Purchases | 444 | 897
Sales | (1) |
Issuances | 23 | 57
Settlements | (237) | (231)
Ending Balance | 2,654 | 2,310
Unrealized gains (losses) on assets held on Consolidated Balance Sheet | 115 | 509
Fair Value, Measurements, Recurring | Level 3 | Mortgage Servicing Rights | Commercial Mortgages |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Beginning Balance | 1,113 | 740
Included in Earnings | 157 | 473
Purchases | 44 | 46
Issuances | 50 | 62
Settlements | (332) | (208)
Ending Balance | 1,032 | 1,113
Unrealized gains (losses) on assets held on Consolidated Balance Sheet | 157 | 473
Fair Value, Measurements, Recurring | Level 3 | Financial derivatives |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Beginning Balance | 5 | 38
Included in Earnings | 19 | (6)
Purchases | 4 | 8
Settlements | (22) | (35)
Ending Balance | 6 | 5
Unrealized gains (losses) on assets held on Consolidated Balance Sheet | 24 | 19
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Beginning Balance | 123 | 285
Included in Earnings | 266 | 49
Sales | 5 | 14
Settlements | (242) | (225)
Ending Balance | 152 | 123
Unrealized gains or (losses) on liabilities held on Consolidated Balance Sheet | 272 | 62
Fair Value, Measurements, Recurring | Level 3 | Other borrowed funds |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Beginning Balance | 4 | 3
Issuances | 13 | 7
Settlements | (8) | (6)
Ending Balance | 9 | 4
Fair Value, Measurements, Recurring | Level 3 | Other liabilities |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Beginning Balance | 294 | 175
Included in Earnings | 56 | 77
Purchases |  | 32
Issuances | 442 | 876
Settlements | (555) | (866)
Ending Balance | 237 | 294
Unrealized gains or (losses) on liabilities held on Consolidated Balance Sheet | 41 | $ 66
Fair Value, Measurements, Recurring | Level 3 | Other assets |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Included in Earnings | 1 |
Purchases | 7 |
Ending Balance | $ 8 |

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- Definition This item represents the amount of the net change in unrealized (holding) gains or losses for the period which are included in the statement of income. Such unrealized (holding) gains or losses relate to those assets and liabilities still held at the reporting date for which fair value is measured on a recurring basis using significant unobservable inputs (Level 3). + References No definition available. + Details
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- Definition This element represents net gains or losses for the period (realized and unrealized), arising from assets and liabilities measure at fair value on a recurring basis using unobservable inputs (Level 3), which are included in earnings or resulted in a change in net asset value. + References No definition available. + Details
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- Definition Amount of unrealized gain (loss) recognized in income from asset measured at fair value on recurring basis using unobservable input (level 3) and still held. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (d) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482106/820-10-50-2 + Details
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- Definition Amount of unrealized gain (loss) recognized in income from liability measured at fair value on recurring basis using unobservable input (level 3) and still held. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (d) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482106/820-10-50-2 + Details
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- Definition Amount of gain (loss) recognized in income from asset measured at fair value on recurring basis using unobservable input (level 3). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(1) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482106/820-10-50-2 + Details
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- Definition Amount of gain (loss) recognized in other comprehensive income (OCI) from asset measured at fair value on recurring basis using unobservable input (level 3). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(1a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482106/820-10-50-2 + Details
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- Definition Amount of issuances of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482106/820-10-50-2 + Details
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- Definition Amount of purchases of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482106/820-10-50-2 + Details
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- Definition Amount of sale of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482106/820-10-50-2 + Details
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- Definition Amount of settlement of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482106/820-10-50-2 + Details
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- Definition Amount of transfer of financial instrument classified as an asset into level 3 of the fair value hierarchy. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(3) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482106/820-10-50-2 + Details
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- Definition Amount of transfers of financial instrument classified as an asset out of level 3 of the fair value hierarchy. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(3) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482106/820-10-50-2 + Details
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- Definition Amount of gain (loss) recognized in income from liability measured at fair value on recurring basis using unobservable input (level 3). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(1) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482106/820-10-50-2 + Details
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- Definition Indicates line item in statement in which net income is reported that includes gain (loss) from asset measured at fair value using unobservable input (level 3). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(1) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482106/820-10-50-2 + Details
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- Definition Indicates line item in statement in which other comprehensive income (OCI) is reported that includes gain (loss) from asset measured at fair value using unobservable input (level 3). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(1a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482106/820-10-50-2 + Details
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