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Fair Value (Reconciliation of Recurring Fair Value Measurements) (Details) - Fair Value, Recurring - Level 3 - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Beginning Balance | $ 5,611 | $ 4,873 | $ 5,137 | $ 5,395
Included in Earnings | 78 | (35) | 575 | (521)
Included in other comprehensive income | 3 | 141 | 22 | (115)
Purchases | 417 | 153 | 666 | 285
Sales | (97) | (23) | (143) | (108)
Issuances | 45 | 46 | 76 | 67
Settlements | (318) | (241) | (589) | (82)
Transfers into Level 3 | 5 | 102 | 8 | 106
Transfers out of Level 3 | (10) | (78) | (18) | (89)
Impact from BBVA Acquisition | 571 |  | 571 |
Ending Balance | 6,305 | 4,938 | 6,305 | 4,938
Unrealized gains/losses on assets held on Consolidated Balance Sheet | 44 | (16) | 531 | (541)
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Beginning Balance | 302 | 262 | 318 | 344
Included in Earnings | 32 | 32 | 53 | 42
Purchases |  |  |  |
Sales | 1 | 1 | 3 | 2
Issuances | 287 | 39 | 318 | 62
Settlements | (303) | (40) | (373) | (156)
Transfers into Level 3 |  |  |  | 2
Transfers out of Level 3 |  | 2 |  |
Impact from BBVA Acquisition | 7 |  | 7 |
Ending Balance | 326 | 296 | 326 | 296
Unrealized gains/losses on liabilities held on Consolidated Balance Sheet | 46 | 25 | 20 | 29
Fair Value Additional Information [Abstract] |  |  |  |
Net gains (losses) included in earnings (realized and unrealized) relating to Level 3 assets and liabilities | 46 | (67) | 522 | (563)
Net unrealized gains (losses) relating to Level 3 assets and liabilities | (2) | (41) | 511 | (570)
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 | 165 | 4 | 163 | 2
Included in Earnings | (1) |  |  |
Purchases | 3 | 5 | 38 | 7
Sales | (36) | (1) | (52) | (2)
Settlements | (12) | (3) | (28) | (3)
Transfers into Level 3 | 5 | 83 | 8 | 87
Transfers out of Level 3 | (5) |  | (10) | (3)
Ending Balance | 119 | 88 | 119 | 88
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 | 56 | 60 | 57 | 64
Included in Earnings | 1 |  |  | (1)
Sales | (6) |  | (6) |
Settlements | 1 |  | 1 | (3)
Ending Balance | 52 | 60 | 52 | 60
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 |  |  |  |
Impact from BBVA Acquisition | 239 |  | 239 |
Ending Balance | 239 |  | 239 |
Securities available for sale |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Beginning Balance | 1,593 | 1,717 | 1,647 | 2,055
Included in Earnings | 11 | 14 | 21 | 32
Included in other comprehensive income | 3 | 141 | 22 | (115)
Purchases | 2 |  | 3 | 4
Sales |  |  |  |
Settlements | (113) | (99) | (197) | (203)
Transfers into Level 3 |  | 19 |  | 19
Ending Balance | 1,496 | 1,792 | 1,496 | 1,792
Securities available for sale | Residential mortgage-backed |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Beginning Balance | 1,316 | 1,442 | 1,365 | 1,741
Included in Earnings | 11 | 12 | 20 | 28
Included in other comprehensive income |  | 123 | 16 | (99)
Settlements | (90) | (86) | (164) | (179)
Ending Balance | 1,237 | 1,491 | 1,237 | 1,491
Securities available for sale | Commercial mortgage-backed |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Beginning Balance | 11 |  | 11 |
Transfers into Level 3 |  | 19 |  | 19
Ending Balance | 11 | 19 | 11 | 19
Securities available for sale | Asset-backed |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Beginning Balance | 194 | 202 | 199 | 240
Included in Earnings |  | 2 | 1 | 4
Included in other comprehensive income | 2 | 16 | 5 | (13)
Purchases |  |  |  |
Settlements | (21) | (10) | (30) | (21)
Ending Balance | 175 | 210 | 175 | 210
Securities available for sale | Other |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Beginning Balance | 72 | 73 | 72 | 74
Included in Earnings |  |  |  |
Included in other comprehensive income | 1 | 2 | 1 | (3)
Purchases | 2 |  | 3 | 4
Settlements | (2) | (3) | (3) | (3)
Ending Balance | 73 | 72 | 73 | 72
Loans |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Beginning Balance | 711 | 655 | 647 | 300
Included in Earnings | 10 | 2 | 20 | 13
Purchases | 9 | 55 | 97 | 71
Sales | (3) | (5) | (6) | (31)
Issuances |  |  |  |
Settlements | (35) | (22) | (63) | 340
Transfers out of Level 3 | (5) | (78) | (8) | (86)
Impact from BBVA Acquisition | 292 |  | 292 |
Ending Balance | 979 | 607 | 979 | 607
Unrealized gains/losses on assets held on Consolidated Balance Sheet | 10 | 2 | 20 | 13
Equity investments |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Beginning Balance | 1,343 | 1,220 | 1,263 | 1,276
Included in Earnings | 157 | (62) | 224 | (131)
Purchases | 92 | 42 | 132 | 113
Sales | (52) | (17) | (79) | (75)
Impact from BBVA Acquisition |  |  |  |
Ending Balance | 1,540 | 1,183 | 1,540 | 1,183
Unrealized gains/losses on assets held on Consolidated Balance Sheet | 136 | (62) | 199 | (125)
Mortgage Servicing Rights | Residential mortgage loans held for sale |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Beginning Balance | 979 | 605 | 673 | 995
Included in Earnings | (141) | (40) | 154 | (419)
Purchases | 301 | 43 | 372 | 61
Issuances | 24 | 12 | 37 | 22
Settlements | (87) | (43) | (160) | (82)
Impact from BBVA Acquisition | 35 |  | 35 |
Ending Balance | 1,111 | 577 | 1,111 | 577
Unrealized gains/losses on assets held on Consolidated Balance Sheet | (141) | (41) | 154 | (420)
Mortgage Servicing Rights | Commercial mortgage loans held for sale |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Beginning Balance | 701 | 477 | 569 | 649
Included in Earnings | (19) | 1 | 110 | (166)
Purchases | 8 | 4 | 21 | 23
Issuances | 21 | 34 | 39 | 45
Settlements | (29) | (26) | (57) | (61)
Impact from BBVA Acquisition |  |  |  |
Ending Balance | 682 | 490 | 682 | 490
Unrealized gains/losses on assets held on Consolidated Balance Sheet | (18) | 1 | 111 | (166)
Financial derivatives |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Beginning Balance | 63 | 135 | 118 | 54
Included in Earnings | 60 | 50 | 46 | 151
Purchases | 2 | 4 | 3 | 6
Settlements | (43) | (48) | (85) | (70)
Impact from BBVA Acquisition | 5 |  | 5 |
Ending Balance | 87 | 141 | 87 | 141
Unrealized gains/losses on assets held on Consolidated Balance Sheet | 57 | 84 | 46 | 158
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Beginning Balance | 227 | 185 | 273 | 200
Included in Earnings | 4 | 28 | (10) | 36
Sales | 1 | 1 | 3 | 2
Issuances |  |  |  |
Settlements | (39) | (5) | (73) | (29)
Impact from BBVA Acquisition | 7 |  | 7 |
Ending Balance | 200 | 209 | 200 | 209
Unrealized gains/losses on liabilities held on Consolidated Balance Sheet | 19 | 27 | (11) | 37
Other borrowed funds |  |  |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Beginning Balance | 2 | 5 | 2 | 7
Issuances |  | 13 | 1 | 25
Settlements |  | (16) | (1) | (30)
Ending Balance | 2 | 2 | 2 | 2
Other liabilities |  |  |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Beginning Balance | 73 | 72 | 43 | 137
Included in Earnings | 28 | 4 | 63 | 6
Issuances | 287 | 26 | 317 | 37
Settlements | (264) | (19) | (299) | (97)
Transfers into Level 3 |  |  |  | 2
Transfers out of Level 3 |  | 2 |  |
Ending Balance | 124 | 85 | 124 | 85
Unrealized gains/losses on liabilities held on Consolidated Balance Sheet | $ 27 | $ (2) | $ 31 | $ (8)

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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 -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 transfers of financial instrument classified as a liability 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 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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