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Fair Value (Reconciliation ofLevel 3 Assets and Liabilities) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021
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 | $ 5,882 | $ 5,137
Included in Earnings | 1,457 | 1,147
Included in Other comprehensive income (b) | (126) | 8
Purchases | 1,529 | 1,207
Sales | (816) | (1,143)
Issuances | 119 | 174
Settlements | (896) | (1,218)
Transfers into Level 3 | 163 | 18
Transfers out of Level 3 | (60) | (36)
Impact from BBVA Acquisition |  | 588
Ending Balance | 7,252 | 5,882
Unrealized gains (losses) on assets held on Consolidated Balance Sheet | 1,250 | 847
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Beginning Balance | 463 | 318
Included in Earnings | 126 | 296
Purchases | 32 |
Sales | 14 | 6
Issuances | 883 | 326
Settlements | (1,097) | (490)
Impact from BBVA Acquisition |  | 7
Ending Balance | 421 | 463
Unrealized gains or (losses) on liabilities held on Consolidated Balance Sheet | 128 | 269
Fair Value Additional Information [Abstract] |  |
Net gains (losses) included in earnings (realized and unrealized) relating to Level 3 assets and liabilities | 1,331 | 851
Net unrealized gains (losses) relating to Level 3 assets and liabilities | 1,122 | 578
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 | 81 | 163
Included in Earnings | (5) | (1)
Purchases | 226 | 47
Sales | (34) | (83)
Settlements | (13) | (41)
Transfers into Level 3 | 29 | 18
Transfers out of Level 3 | (41) | (22)
Ending Balance | 243 | 81
Unrealized gains (losses) on assets held on Consolidated Balance Sheet | (5) | (1)
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 | 49 | 57
Included in Earnings | (6) |
Sales |  | (6)
Settlements | (10) | (2)
Ending Balance | 33 | 49
Unrealized gains (losses) on assets held on Consolidated Balance Sheet | (6) | (1)
Fair Value, Measurements, Recurring | Level 3 | Loans Held For Sale | Other consumer loans held for sale |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Sales |  | (256)
Impact from BBVA Acquisition |  | 256
Fair Value, Measurements, Recurring | Level 3 | Securities available for sale |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Beginning Balance | 1,332 | 1,647
Included in Earnings | 24 | 39
Included in Other comprehensive income (b) | (126) | 8
Purchases | 6 | 6
Settlements | (235) | (368)
Ending Balance | 1,001 | 1,332
Fair Value, Measurements, Recurring | Level 3 | Securities available for sale | Residential mortgage-backed Securities |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Beginning Balance | 1,097 | 1,365
Included in Earnings | 22 | 37
Included in Other comprehensive income (b) | (108) | 6
Settlements | (192) | (311)
Ending Balance | 819 | 1,097
Fair Value, Measurements, Recurring | Level 3 | Securities available for sale | Commercial mortgage- backed non-agency |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Beginning Balance | 3 | 11
Included in Other comprehensive income (b) |  | (8)
Ending Balance | 3 | 3
Fair Value, Measurements, Recurring | Level 3 | Securities available for sale | Asset-backed |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Beginning Balance | 163 | 199
Included in Earnings | 2 | 2
Included in Other comprehensive income (b) | (18) | 9
Settlements | (23) | (47)
Ending Balance | 124 | 163
Fair Value, Measurements, Recurring | Level 3 | Securities available for sale | Other debt |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Beginning Balance | 69 | 72
Included in Other comprehensive income (b) |  | 1
Purchases | 6 | 6
Settlements | (20) | (10)
Ending Balance | 55 | 69
Fair Value, Measurements, Recurring | Level 3 | Loans |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Beginning Balance | 884 | 647
Included in Earnings | 23 | 45
Purchases | 55 | 124
Sales | (10) | (15)
Settlements | (164) | (194)
Transfers out of Level 3 | (19) | (14)
Impact from BBVA Acquisition |  | 291
Ending Balance | 769 | 884
Unrealized gains (losses) on assets held on Consolidated Balance Sheet | 23 | 44
Fair Value, Measurements, Recurring | Level 3 | Equity investments |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Beginning Balance | 1,680 | 1,263
Included in Earnings | 445 | 627
Purchases | 291 | 573
Sales | (772) | (783)
Transfers into Level 3 | 134 |
Ending Balance | 1,778 | 1,680
Unrealized gains (losses) on assets held on Consolidated Balance Sheet | 237 | 338
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 | 1,078 | 673
Included in Earnings | 509 | 192
Purchases | 897 | 411
Issuances | 57 | 87
Settlements | (231) | (320)
Impact from BBVA Acquisition |  | 35
Ending Balance | 2,310 | 1,078
Unrealized gains (losses) on assets held on Consolidated Balance Sheet | 509 | 192
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 | 740 | 569
Included in Earnings | 473 | 162
Purchases | 46 | 41
Issuances | 62 | 87
Settlements | (208) | (119)
Ending Balance | 1,113 | 740
Unrealized gains (losses) on assets held on Consolidated Balance Sheet | 473 | 162
Fair Value, Measurements, Recurring | Level 3 | Financial derivatives |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Beginning Balance | 38 | 118
Included in Earnings | (6) | 83
Purchases | 8 | 5
Settlements | (35) | (174)
Impact from BBVA Acquisition |  | 6
Ending Balance | 5 | 38
Unrealized gains (losses) on assets held on Consolidated Balance Sheet | 19 | 113
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Beginning Balance | 285 | 273
Included in Earnings | 49 | 145
Sales | 14 | 6
Settlements | (225) | (146)
Impact from BBVA Acquisition |  | 7
Ending Balance | 123 | 285
Unrealized gains or (losses) on liabilities held on Consolidated Balance Sheet | 62 | 158
Fair Value, Measurements, Recurring | Level 3 | Other borrowed funds |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Beginning Balance | 3 | 2
Issuances | 7 | 5
Settlements | (6) | (4)
Ending Balance | 4 | 3
Fair Value, Measurements, Recurring | Level 3 | Other liabilities |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Beginning Balance | 175 | 43
Included in Earnings | 77 | 151
Purchases | 32 |
Issuances | 876 | 321
Settlements | (866) | (340)
Ending Balance | 294 | 175
Unrealized gains or (losses) on liabilities held on Consolidated Balance Sheet | $ 66 | $ 111

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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 Indicates line item in statement in which net income is reported that includes unrealized gain (loss) from asset measured at fair value using unobservable input (level 3) and still held. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI https://asc.fasb.org/extlink&oid=126976982&loc=d3e19207-110258 + 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 -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI https://asc.fasb.org/extlink&oid=126976982&loc=d3e19207-110258 + 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 -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI https://asc.fasb.org/extlink&oid=126976982&loc=d3e19207-110258 + Details
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- Definition Indicates line item in statement in which net income is reported that includes unrealized gain (loss) from liability measured at fair value using unobservable input (level 3) and still held. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI https://asc.fasb.org/extlink&oid=126976982&loc=d3e19207-110258 + 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 -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI https://asc.fasb.org/extlink&oid=126976982&loc=d3e19207-110258 + 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 -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1a) -URI https://asc.fasb.org/extlink&oid=126976982&loc=d3e19207-110258 + 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 -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2) -URI https://asc.fasb.org/extlink&oid=126976982&loc=d3e19207-110258 + 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 -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2) -URI https://asc.fasb.org/extlink&oid=126976982&loc=d3e19207-110258 + 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 -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2) -URI https://asc.fasb.org/extlink&oid=126976982&loc=d3e19207-110258 + 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 -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2) -URI https://asc.fasb.org/extlink&oid=126976982&loc=d3e19207-110258 + 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 -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(3) -URI https://asc.fasb.org/extlink&oid=126976982&loc=d3e19207-110258 + 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 -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(3) -URI https://asc.fasb.org/extlink&oid=126976982&loc=d3e19207-110258 + 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 -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI https://asc.fasb.org/extlink&oid=126976982&loc=d3e19207-110258 + Details
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- Definition Amount of issuances of financial instrument classified as a liability 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 -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2) -URI https://asc.fasb.org/extlink&oid=126976982&loc=d3e19207-110258 + Details
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- Definition Amount of purchases of financial instrument classified as a liability 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 -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2) -URI https://asc.fasb.org/extlink&oid=126976982&loc=d3e19207-110258 + Details
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- Definition Amount of sales of financial instrument classified as a liability 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 -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2) -URI https://asc.fasb.org/extlink&oid=126976982&loc=d3e19207-110258 + Details
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- Definition Amount of settlements of financial instrument classified as a liability 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 -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2) -URI https://asc.fasb.org/extlink&oid=126976982&loc=d3e19207-110258 + Details
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- Definition Fair value of financial instrument classified as a liability 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 -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI https://asc.fasb.org/extlink&oid=126976982&loc=d3e19207-110258 + 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 -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI https://asc.fasb.org/extlink&oid=126976982&loc=d3e19207-110258 + 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 -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1a) -URI https://asc.fasb.org/extlink&oid=126976982&loc=d3e19207-110258 + Details
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- Definition Indicates line item in statement in which net income is reported that includes gain (loss) from liability measured at fair value using unobservable input (level 3). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI https://asc.fasb.org/extlink&oid=126976982&loc=d3e19207-110258 + Details
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