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Fair Value (Reconciliation of Recurring Fair Value Measurements) (Details) - Fair Value, Recurring [Member] - Level 3 [Member] - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Beginning Balance | $ 4,873 | $ 5,827 | $ 5,395 | $ 6,157
Included in earnings | (35) | (136) | (521) | (162)
Included in other comprehensive income | 141 | 22 | (115) | 26
Purchases | 153 | 255 | 285 | 349
Sales | (23) | (59) | (108) | (198)
Issuances | 46 | 15 | 67 | 29
Settlements | (241) | (228) | (82) | (499)
Transfers Into Level 3 | 102 | 2 | 106 | 7
Transfers out of Level 3 | (78) | (11) | (89) | (22)
Ending Balance | 4,938 | 5,687 | 4,938 | 5,687
Unrealized gains/losses on assets held on Consolidated Balance Sheet | (16) | (161) | (541) | (355)
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Beginning Balance | 262 | 298 | 344 | 333
Included in earnings | 32 | 31 | 42 | 70
Purchases |  |  |  |
Sales | (1) | (1) | 2 | 3
Issuances | 39 | 63 | 62 | 79
Settlements | (40) | (89) | (156) | (181)
Transfers into Level 3 |  |  | 2 |
Transfers out of Level 3 | 2 |  |  |
Ending Balance | 296 | 304 | 296 | 304
Unrealized gains/losses on liabilities held on Consolidated Balance Sheet | 25 | 22 | 29 | 64
Fair Value Additional Information [Abstract] |  |  |  |
Net gains (losses) included in earnings (realized and unrealized) relating to Level 3 assets and liabilities | (67) | (167) | (563) | (232)
Net unrealized gains (losses) relating to Level 3 assets and liabilities | (41) | (183) | (570) | (419)
Loans Held For Sale [Member] | Residential Mortgage [Member] |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Beginning Balance | 4 | 2 | 2 | 2
Purchases | 5 | 1 | 7 | 2
Sales | (1) |  | (2) | (1)
Settlements | (3) |  | (3) |
Transfers Into Level 3 | 83 | 1 | 87 | 4
Transfers out of Level 3 |  | (2) | (3) | (5)
Ending Balance | 88 | 2 | 88 | 2
Loans Held For Sale [Member] | Commercial Mortgages [Member] |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Beginning Balance | 60 | 73 | 64 | 87
Included in earnings |  | 1 | (1) | 2
Settlements |  | (1) | (3) | (16)
Ending Balance | 60 | 73 | 60 | 73
Unrealized gains/losses on assets held on Consolidated Balance Sheet |  | 1 | (1) | 2
Available-for-sale Securities [Member] |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Beginning Balance | 1,717 | 2,393 | 2,055 | 2,486
Included in earnings | 14 | 20 | 32 | 38
Included in other comprehensive income | 141 | 22 | (115) | 26
Purchases |  | 2 | 4 | 3
Sales |  | (3) |  | (3)
Settlements | (99) | (117) | (203) | (233)
Transfers Into Level 3 | 19 |  | 19 |
Transfers out of Level 3 |  |  |  |
Ending Balance | 1,792 | 2,317 | 1,792 | 2,317
Available-for-sale Securities [Member] | Residential Mortgage-backed Securities [Member] |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Beginning Balance | 1,442 | 2,042 | 1,741 | 2,128
Included in earnings | 12 | 18 | 28 | 36
Included in other comprehensive income | 123 | 19 | (99) | 21
Settlements | (86) | (103) | (179) | (209)
Ending Balance | 1,491 | 1,976 | 1,491 | 1,976
Available-for-sale Securities [Member] | Asset backed [Member] |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Beginning Balance | 202 | 266 | 240 | 274
Included in earnings | 2 | 2 | 4 | 2
Included in other comprehensive income | 16 | 4 | (13) | 6
Settlements | (10) | (11) | (21) | (21)
Ending Balance | 210 | 261 | 210 | 261
Available-for-sale Securities [Member] | Commercial Mortgage Backed Securities [Member] |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Transfers Into Level 3 | 19 |  | 19 |
Ending Balance | 19 |  | 19 |
Available-for-sale Securities [Member] | Other [Member] |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Beginning Balance | 73 | 85 | 74 | 84
Included in other comprehensive income | 2 | (1) | (3) | (1)
Purchases |  | 2 | 4 | 3
Sales |  | (3) |  | (3)
Settlements | (3) | (3) | (3) | (3)
Transfers out of Level 3 |  |  |  |
Ending Balance | 72 | 80 | 72 | 80
Loans [Member] |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Beginning Balance | 655 | 272 | 300 | 272
Included in earnings | 2 | 2 | 13 | 5
Purchases | 55 | 13 | 71 | 33
Sales | (5) | (8) | (31) | (11)
Issuances |  | (1) |  | (1)
Settlements | (22) | (11) | 340 | (25)
Transfers Into Level 3 |  | 1 |  | 3
Transfers out of Level 3 | (78) | (9) | (86) | (17)
Ending Balance | 607 | 259 | 607 | 259
Unrealized gains/losses on assets held on Consolidated Balance Sheet | 2 | 1 | 13 | 2
Equity Investments [Member] |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Beginning Balance | 1,220 | 1,217 | 1,276 | 1,255
Included in earnings | (62) | 4 | (131) | 56
Purchases | 42 | 150 | 113 | 195
Sales | (17) | (48) | (75) | (183)
Ending Balance | 1,183 | 1,323 | 1,183 | 1,323
Unrealized gains/losses on assets held on Consolidated Balance Sheet | (62) | 3 | (125) | 3
Mortgage Servicing Rights [Member] | Residential Mortgage [Member] |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Beginning Balance | 605 | 1,131 | 995 | 1,257
Included in earnings | (40) | (156) | (419) | (262)
Purchases | 43 | 59 | 61 | 65
Issuances | 12 | 7 | 22 | 14
Settlements | (43) | (44) | (82) | (77)
Ending Balance | 577 | 997 | 577 | 997
Unrealized gains/losses on assets held on Consolidated Balance Sheet | (41) | (156) | (420) | (261)
Mortgage Servicing Rights [Member] | Commercial Mortgages [Member] |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Beginning Balance | 477 | 681 | 649 | 726
Included in earnings | 1 | (55) | (166) | (88)
Purchases | 4 | 32 | 23 | 51
Issuances | 34 | 9 | 45 | 16
Settlements | (26) | (37) | (61) | (75)
Ending Balance | 490 | 630 | 490 | 630
Unrealized gains/losses on assets held on Consolidated Balance Sheet | 1 | (55) | (166) | (88)
Trading Securities [Member] |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Beginning Balance |  | 2 |  | 2
Settlements |  | (2) |  | (2)
Derivative [Member] |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Beginning Balance | 135 | 56 | 54 | 25
Included in earnings | 50 | 48 | 151 | 87
Purchases | 4 | (2) | 6 |
Settlements | (48) | (16) | (70) | (26)
Ending Balance | 141 | 86 | 141 | 86
Unrealized gains/losses on assets held on Consolidated Balance Sheet | 84 | 45 | 158 | (13)
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Beginning Balance | 185 | 230 | 200 | 268
Included in earnings | 28 | 20 | 36 | 50
Sales | (1) | 1 | 2 | 1
Settlements | (5) | (28) | (29) | (98)
Ending Balance | 209 | 221 | 209 | 221
Unrealized gains/losses on liabilities held on Consolidated Balance Sheet | 27 | 19 | 37 | 53
Other Assets [Member] |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Beginning Balance |  |  |  | 45
Included in earnings |  |  |  |
Settlements |  |  |  | (45)
Unrealized gains/losses on assets held on Consolidated Balance Sheet |  |  |  |
Other Borrowed Funds [Member] |  |  |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Beginning Balance | 5 | 6 | 7 | 7
Issuances | 13 | 12 | 25 | 26
Settlements | (16) | (13) | (30) | (28)
Ending Balance | 2 | 5 | 2 | 5
Other liabilities [Member] |  |  |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Beginning Balance | 72 | 62 | 137 | 58
Included in earnings | 4 | 11 | 6 | 20
Sales |  | (2) |  | 2
Issuances | 26 | 51 | 37 | 53
Settlements | (19) | (48) | (97) | (55)
Transfers into Level 3 |  |  | 2 |
Transfers out of Level 3 | 2 |  |  |
Ending Balance | 85 | 78 | 85 | 78
Unrealized gains/losses on liabilities held on Consolidated Balance Sheet | $ (2) | $ 3 | $ (8) | $ 11

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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 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 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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