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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, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Beginning Balance | $ 7,466 | $ 6,987 | $ 7,448 | $ 7,252
Included in Earnings | (80) | 348 | 235 | 656
Included in other comprehensive income | 24 | (22) | 13 | (22)
Purchases | 114 | 577 | 334 | 970
Sales | (105) | (186) | (202) | (627)
Issuances | 18 | 13 | 41 | 55
Settlements | (208) | (233) | (629) | (658)
Transfers into Level 3 | 1 | 99 | 4 | 120
Transfers out of Level 3 | (5) | (10) | (19) | (173)
Ending Balance | 7,225 | 7,573 | 7,225 | 7,573
Unrealized gains/losses for the period on assets held on Consolidated Balance Sheet | (90) | 337 | 210 | 613
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Beginning Balance | 386 | 384 | 398 | 421
Included in Earnings | 138 | 56 | 242 | 229
Sales | 2 | 2 | 4 | 5
Issuances | 3 | 332 | 38 | 445
Settlements | (64) | (409) | (217) | (735)
Ending Balance | 465 | 365 | 465 | 365
Unrealized gains/losses for the period on liabilities held on Consolidated Balance Sheet | 132 | 51 | 263 | 214
Fair Value Additional Information [Abstract] |  |  |  |
Net gains (losses) included in earnings (realized and unrealized) relating to Level 3 assets and liabilities | (218) | 292 | (7) | 427
Net unrealized gains (losses) relating to Level 3 assets and liabilities | (222) | 286 | (53) | 399
Other borrowed funds |  |  |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Beginning Balance | 9 | 5 | 9 | 4
Issuances | 2 | 3 | 9 | 9
Settlements | (3) | (1) | (10) | (6)
Ending Balance | 8 | 7 | 8 | 7
Financial derivatives |  |  |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Beginning Balance | 183 | 140 | 152 | 123
Included in Earnings | 128 | 50 | 246 | 168
Sales | 2 | 2 | 4 | 5
Settlements | (32) | (84) | (121) | (188)
Ending Balance | 281 | 108 | 281 | 108
Unrealized gains/losses for the period on liabilities held on Consolidated Balance Sheet | 129 | 51 | 252 | 173
Other liabilities |  |  |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Beginning Balance | 194 | 239 | 237 | 294
Included in Earnings | 10 | 6 | (4) | 61
Issuances | 1 | 329 | 29 | 436
Settlements | (29) | (324) | (86) | (541)
Ending Balance | 176 | 250 | 176 | 250
Unrealized gains/losses for the period on liabilities held on Consolidated Balance Sheet | 3 |  | 11 | 41
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 | 95 | 191 | 103 | 243
Included in Earnings | 1 | (3) |  | (3)
Purchases | 2 | 3 | 16 | 12
Sales | (26) | (89) | (37) | (131)
Settlements | (2) | (2) | (6) | (9)
Transfers into Level 3 | 1 | 1 | 4 | 4
Transfers out of Level 3 | (1) | (4) | (10) | (19)
Ending Balance | 70 | 97 | 70 | 97
Unrealized gains/losses for the period on assets held on Consolidated Balance Sheet | 2 | (4) |  | (3)
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 | 4 | 25 | 11 | 33
Included in Earnings | 1 |  | 1 |
Settlements | (1) |  | (8) | (8)
Ending Balance | 4 | 25 | 4 | 25
Unrealized gains/losses for the period on assets held on Consolidated Balance Sheet |  |  |  |
Securities available for sale |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Beginning Balance | 877 | 942 | 956 | 1,001
Included in Earnings | 4 | 4 | 8 | 13
Included in other comprehensive income | 24 | (22) | 13 | (22)
Purchases | 1 | 3 | 4 | 6
Sales |  |  |  |
Settlements | (25) | (52) | (100) | (126)
Transfers into Level 3 |  | 92 |  | 95
Ending Balance | 881 | 967 | 881 | 967
Unrealized gains/losses for the period on assets held on Consolidated Balance Sheet |  |  | (2) |
Residential mortgage- backed non-agency |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Beginning Balance | 624 | 768 | 696 | 819
Included in Earnings | 4 | 5 | 10 | 13
Included in other comprehensive income | 21 | (20) | 10 | (16)
Settlements | (21) | (40) | (88) | (103)
Ending Balance | 628 | 713 | 628 | 713
Commercial mortgage- backed non-agency |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Beginning Balance | 103 | 3 | 103 | 3
Included in other comprehensive income |  |  |  |
Transfers into Level 3 |  | 92 |  | 92
Ending Balance | 103 | 95 | 103 | 95
Asset-backed |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Beginning Balance | 96 | 117 | 102 | 124
Included in Earnings | 1 |  | 1 | 1
Included in other comprehensive income | 3 | (3) | 2 | (3)
Settlements | (4) | (11) | (9) | (19)
Ending Balance | 96 | 103 | 96 | 103
Other |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Beginning Balance | 54 | 54 | 55 | 55
Included in Earnings | (1) | (1) | (3) | (1)
Included in other comprehensive income |  | 1 | 1 | (3)
Purchases | 1 | 3 | 4 | 6
Settlements |  | (1) | (3) | (4)
Transfers into Level 3 |  |  |  | 3
Ending Balance | 54 | 56 | 54 | 56
Unrealized gains/losses for the period on assets held on Consolidated Balance Sheet |  |  | (2) |
Loans |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Beginning Balance | 701 | 745 | 726 | 769
Included in Earnings | 4 | 5 | 12 | 11
Included in other comprehensive income |  |  |  |
Purchases | 4 | 19 | 16 | 39
Sales |  |  | (2) | (1)
Settlements | (21) | (27) | (59) | (77)
Transfers into Level 3 |  | 2 |  | 17
Transfers out of Level 3 | (4) | (6) | (9) | (20)
Ending Balance | 684 | 738 | 684 | 738
Unrealized gains/losses for the period on assets held on Consolidated Balance Sheet | 5 | 5 | 12 | 11
Equity investments |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Beginning Balance | 2,030 | 1,623 | 1,952 | 1,778
Included in Earnings | 27 | (9) | 53 | 136
Purchases | 85 | 212 | 221 | 444
Sales | (79) | (97) | (163) | (495)
Transfers out of Level 3 |  |  |  | (134)
Ending Balance | 2,063 | 1,729 | 2,063 | 1,729
Unrealized gains/losses for the period on assets held on Consolidated Balance Sheet | 16 | (16) | 35 | 103
Mortgage Servicing Rights | Residential mortgage loans held for sale |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Beginning Balance | 2,657 | 2,349 | 2,654 | 2,310
Included in Earnings | (71) | 215 | 17 | 248
Purchases | 1 | 329 | 30 | 438
Issuances | 6 | 7 | 18 | 17
Settlements | (65) | (63) | (191) | (176)
Ending Balance | 2,528 | 2,837 | 2,528 | 2,837
Unrealized gains/losses for the period on assets held on Consolidated Balance Sheet | (71) | 215 | 17 | 248
Mortgage Servicing Rights | Commercial mortgage loans held for sale |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Beginning Balance | 1,082 | 1,106 | 1,032 | 1,113
Included in Earnings | (54) | 130 | 118 | 238
Purchases | 19 | 10 | 43 | 27
Issuances | 12 | 6 | 23 | 38
Settlements | (84) | (83) | (241) | (247)
Ending Balance | 975 | 1,169 | 975 | 1,169
Unrealized gains/losses for the period on assets held on Consolidated Balance Sheet | (54) | 130 | 118 | 238
Financial derivatives |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Beginning Balance | 12 | 6 | 6 | 5
Included in Earnings | 8 | 6 | 26 | 13
Purchases | 2 |  | 4 | 3
Settlements | (10) | (6) | (24) | (15)
Ending Balance | 12 | 6 | 12 | 6
Unrealized gains/losses for the period on assets held on Consolidated Balance Sheet | 12 | 7 | 30 | 16
Other assets |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Beginning Balance | 8 |  | 8 |
Purchases |  | 1 |  | 1
Transfers into Level 3 |  | 4 |  | 4
Ending Balance | $ 8 | $ 5 | $ 8 | $ 5

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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/exampleRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 101 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482078/820-10-55-101 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-3 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 102 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482078/820-10-55-102 Reference 4: 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 3 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-3 Reference 2: 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/exampleRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 101 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482078/820-10-55-101 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-3 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 102 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482078/820-10-55-102 Reference 4: 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/exampleRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 101 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482078/820-10-55-101 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-3 Reference 3: 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://www.xbrl.org/2003/role/exampleRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 101 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482078/820-10-55-101 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-3 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -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://www.xbrl.org/2003/role/exampleRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 101 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482078/820-10-55-101 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-3 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -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://www.xbrl.org/2003/role/exampleRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 101 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482078/820-10-55-101 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-3 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -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/exampleRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 101 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482078/820-10-55-101 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-3 Reference 3: 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/exampleRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 101 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482078/820-10-55-101 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-3 Reference 3: 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 Fair value 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://www.xbrl.org/2003/role/exampleRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 101 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482078/820-10-55-101 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-3 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c) -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 3 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-3 Reference 2: 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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