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Fair Value (Reconciliation of Recurring Fair Value Measurements) (Details) - Fair Value, Recurring - Level 3 - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Beginning Balance | $ 6,305 | $ 4,938 | $ 5,137 | $ 5,395
Included in Earnings | 382 | 157 | 957 | (364)
Included in other comprehensive income | (5) | 15 | 17 | (100)
Purchases | 213 | 200 | 879 | 485
Sales | (733) | (60) | (876) | (168)
Issuances | 46 | 32 | 122 | 99
Settlements | (314) | (255) | (903) | (337)
Transfers into Level 3 | 4 | 3 | 12 | 109
Transfers out of Level 3 | (11) | (10) | (29) | (99)
Impact from BBVA Acquisition | 17 |  | 588 |
Ending Balance | 5,904 | 5,020 | 5,904 | 5,020
Unrealized gains/losses on assets held on Consolidated Balance Sheet | 218 | 149 | 750 | (402)
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Beginning Balance | 326 | 296 | 318 | 344
Included in Earnings | 210 | (3) | 263 | 39
Sales | 3 | 1 | 6 | 3
Issuances | 7 | 19 | 325 | 81
Settlements | (44) | (78) | (417) | (234)
Transfers into Level 3 |  |  |  | 2
Impact from BBVA Acquisition |  |  | 7 |
Ending Balance | 502 | 235 | 502 | 235
Unrealized gains/losses on liabilities held on Consolidated Balance Sheet | 215 | (1) | 237 | 28
Fair Value Additional Information [Abstract] |  |  |  |
Net gains (losses) included in earnings (realized and unrealized) relating to Level 3 assets and liabilities | 172 | 160 | 694 | (403)
Net unrealized gains (losses) relating to Level 3 assets and liabilities | 3 | 150 | 513 | (430)
Loans held for sale | Residential mortgage loans held for sale |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Beginning Balance | 119 | 88 | 163 | 2
Included in Earnings | (1) |  | (1) |
Purchases | 5 | 15 | 43 | 22
Sales | (29) | (10) | (81) | (12)
Settlements | (6) | (9) | (34) | (12)
Transfers into Level 3 | 4 | 3 | 12 | 90
Transfers out of Level 3 | (6) | (10) | (16) | (13)
Ending Balance | 86 | 77 | 86 | 77
Unrealized gains/losses on assets held on Consolidated Balance Sheet | (1) |  | (1) |
Loans held for sale | Commercial mortgage loans held for sale |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Beginning Balance | 52 | 60 | 57 | 64
Included in Earnings | (1) | (1) | (1) | (2)
Sales |  |  | (6) |
Settlements |  |  | 1 | (3)
Ending Balance | 51 | 59 | 51 | 59
Unrealized gains/losses on assets held on Consolidated Balance Sheet |  |  | 1 | (1)
Loans held for sale | Other consumer loans held for sale |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Beginning Balance | 239 |  |  |
Sales | (256) |  | (256) |
Impact from BBVA Acquisition | 17 |  | 256 |
Securities available for sale |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Beginning Balance | 1,496 | 1,792 | 1,647 | 2,055
Included in Earnings | 11 | 13 | 32 | 45
Included in other comprehensive income | (5) | 15 | 17 | (100)
Purchases | 2 | (1) | 5 | 3
Sales | (9) |  | (9) |
Settlements | (83) | (91) | (280) | (294)
Transfers into Level 3 |  |  |  | 19
Ending Balance | 1,412 | 1,728 | 1,412 | 1,728
Securities available for sale | Residential mortgage-backed |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Beginning Balance | 1,237 | 1,491 | 1,365 | 1,741
Included in Earnings | 10 | 12 | 30 | 40
Included in other comprehensive income | (2) | 18 | 14 | (81)
Settlements | (77) | (83) | (241) | (262)
Ending Balance | 1,168 | 1,438 | 1,168 | 1,438
Securities available for sale | Commercial mortgage-backed |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Beginning Balance | 11 | 19 | 11 |
Included in other comprehensive income | (8) | (8) | (8) | (8)
Transfers into Level 3 |  |  |  | 19
Ending Balance | 3 | 11 | 3 | 11
Securities available for sale | Asset-backed |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Beginning Balance | 175 | 210 | 199 | 240
Included in Earnings | 1 | 1 | 2 | 5
Included in other comprehensive income | 5 | 5 | 10 | (8)
Purchases |  |  |  |
Settlements | (9) | (8) | (39) | (29)
Ending Balance | 172 | 208 | 172 | 208
Securities available for sale | Other |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Beginning Balance | 73 | 72 | 72 | 74
Included in other comprehensive income |  |  | 1 | (3)
Purchases | 2 | (1) | 5 | 3
Sales | (9) |  | (9) |
Settlements | 3 |  |  | (3)
Ending Balance | 69 | 71 | 69 | 71
Loans |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Beginning Balance | 979 | 607 | 647 | 300
Included in Earnings | 12 | 7 | 32 | 20
Purchases | 14 | 63 | 111 | 134
Sales | (6) | (3) | (12) | (34)
Issuances |  |  |  |
Settlements | (58) | (27) | (121) | 313
Transfers out of Level 3 | (5) |  | (13) | (86)
Impact from BBVA Acquisition |  |  | 292 |
Ending Balance | 936 | 647 | 936 | 647
Unrealized gains/losses on assets held on Consolidated Balance Sheet | 12 | 7 | 32 | 20
Equity investments |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Beginning Balance | 1,540 | 1,183 | 1,263 | 1,276
Included in Earnings | 265 | 63 | 489 | (68)
Purchases | 158 | 60 | 290 | 173
Sales | (433) | (47) | (512) | (122)
Ending Balance | 1,530 | 1,259 | 1,530 | 1,259
Unrealized gains/losses on assets held on Consolidated Balance Sheet | 95 | 56 | 294 | (69)
Mortgage Servicing Rights | Residential mortgage loans held for sale |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Beginning Balance | 1,111 | 577 | 673 | 995
Included in Earnings | 49 | 11 | 203 | (408)
Purchases | 28 | 52 | 400 | 113
Issuances | 24 | 12 | 61 | 34
Settlements | (82) | (54) | (242) | (136)
Impact from BBVA Acquisition |  |  | 35 |
Ending Balance | 1,130 | 598 | 1,130 | 598
Unrealized gains/losses on assets held on Consolidated Balance Sheet | 49 | 11 | 203 | (408)
Mortgage Servicing Rights | Commercial mortgage loans held for sale |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Beginning Balance | 682 | 490 | 569 | 649
Included in Earnings | 24 | 23 | 134 | (143)
Purchases | 5 | 8 | 26 | 31
Issuances | 22 | 20 | 61 | 65
Settlements | (30) | (26) | (87) | (87)
Ending Balance | 703 | 515 | 703 | 515
Unrealized gains/losses on assets held on Consolidated Balance Sheet | 24 | 23 | 134 | (144)
Financial derivatives |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Beginning Balance | 87 | 141 | 118 | 54
Included in Earnings | 23 | 41 | 69 | 192
Purchases | 1 | 3 | 4 | 9
Settlements | (55) | (48) | (140) | (118)
Impact from BBVA Acquisition |  |  | 5 |
Ending Balance | 56 | 137 | 56 | 137
Unrealized gains/losses on assets held on Consolidated Balance Sheet | 39 | 52 | 87 | 200
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Beginning Balance | 200 | 209 | 273 | 200
Included in Earnings | 165 | (10) | 155 | 26
Sales | 3 | 1 | 6 | 3
Settlements | (37) | (57) | (110) | (86)
Impact from BBVA Acquisition |  |  | 7 |
Ending Balance | 331 | 143 | 331 | 143
Unrealized gains/losses on liabilities held on Consolidated Balance Sheet | 171 | (7) | 156 | 30
Other borrowed funds |  |  |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Beginning Balance | 2 | 2 | 2 | 7
Issuances | 3 | 2 | 4 | 27
Settlements | (1) | (2) | (2) | (32)
Ending Balance | 4 | 2 | 4 | 2
Other liabilities |  |  |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Beginning Balance | 124 | 85 | 43 | 137
Included in Earnings | 45 | 7 | 108 | 13
Issuances | 4 | 17 | 321 | 54
Settlements | (6) | (19) | (305) | (116)
Transfers into Level 3 |  |  |  | 2
Ending Balance | 167 | 90 | 167 | 90
Unrealized gains/losses on liabilities held on Consolidated Balance Sheet | $ 44 | $ 6 | $ 81 | $ (2)

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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 http://asc.fasb.org/extlink&oid=117815213&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 http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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- Definition Amount of transfers of financial instrument classified as a liability 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 http://asc.fasb.org/extlink&oid=117815213&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 http://asc.fasb.org/extlink&oid=117815213&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 http://asc.fasb.org/extlink&oid=117815213&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 http://asc.fasb.org/extlink&oid=117815213&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 http://asc.fasb.org/extlink&oid=117815213&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 http://asc.fasb.org/extlink&oid=117815213&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 http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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