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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, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Beginning Balance | $ 7,555 | $ 7,142 | $ 7,448 | $ 7,252
Included in Earnings | 128 | 199 | 315 | 308
Included in other comprehensive income | (6) | 13 | (11) |
Purchases | 99 | 211 | 220 | 393
Sales | (91) | (370) | (97) | (441)
Issuances | 15 | 24 | 23 | 42
Settlements | (229) | (228) | (421) | (425)
Transfers into Level 3 | 1 | 8 | 3 | 21
Transfers out of Level 3 | (6) | (12) | (14) | (163)
Ending Balance | 7,466 | 6,987 | 7,466 | 6,987
Unrealized gains/losses on assets held on Consolidated Balance Sheet | 118 | 186 | 303 | 277
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Beginning Balance | 311 | 331 | 398 | 421
Included in Earnings | 116 | 110 | 104 | 173
Sales | 2 | 1 | 2 | 3
Issuances | 19 | 92 | 35 | 113
Settlements | (62) | (150) | (153) | (326)
Ending Balance | 386 | 384 | 386 | 384
Unrealized gains/losses on liabilities held on Consolidated Balance Sheet | 122 | 101 | 129 | 164
Fair Value Additional Information [Abstract] |  |  |  |
Net gains (losses) included in earnings (realized and unrealized) relating to Level 3 assets and liabilities | 12 | 89 | 211 | 135
Net unrealized gains (losses) relating to Level 3 assets and liabilities | (4) | 85 | 174 | 113
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 | 98 | 242 | 103 | 243
Included in Earnings |  | (4) | (1) |
Purchases | 12 | 3 | 14 | 9
Sales | (11) | (41) | (11) | (42)
Settlements | (2) | (2) | (4) | (7)
Transfers into Level 3 | 1 |  | 3 | 3
Transfers out of Level 3 | (3) | (7) | (9) | (15)
Ending Balance | 95 | 191 | 95 | 191
Unrealized gains/losses on assets held on Consolidated Balance Sheet | (1) | (3) | (2) | 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 | 11 | 32 | 11 | 33
Included in Earnings |  | 1 |  |
Settlements | (7) | (8) | (7) | (8)
Ending Balance | 4 | 25 | 4 | 25
Unrealized gains/losses on assets held on Consolidated Balance Sheet |  |  |  |
Non-agency | Residential mortgage-backed |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Beginning Balance | 668 |  | 696 |
Included in Earnings | 3 |  | 6 |
Included in other comprehensive income | (5) |  | (11) |
Settlements | (42) |  | (67) |
Ending Balance | 624 |  | 624 |
Non-agency | Commercial mortgage-backed |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Beginning Balance | 103 |  | 103 |
Ending Balance | 103 |  | 103 |
Securities available for sale |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Beginning Balance | 924 | 964 | 956 | 1,001
Included in Earnings | 3 | 5 | 4 | 9
Included in other comprehensive income | (6) | 13 | (11) |
Purchases | 3 | 3 | 3 | 3
Sales |  |  |  |
Settlements | (47) | (43) | (75) | (74)
Transfers into Level 3 |  |  |  | 3
Ending Balance | 877 | 942 | 877 | 942
Unrealized gains/losses on assets held on Consolidated Balance Sheet |  |  | (2) |
Securities available for sale | Residential mortgage-backed |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Beginning Balance |  | 787 |  | 819
Included in Earnings |  | 4 |  | 8
Included in other comprehensive income |  | 14 |  | 4
Settlements |  | (37) |  | (63)
Ending Balance |  | 768 |  | 768
Securities available for sale | Commercial mortgage-backed |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Beginning Balance |  | 3 |  | 3
Included in other comprehensive income |  |  |  |
Ending Balance |  | 3 |  | 3
Securities available for sale | Asset-backed |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Beginning Balance | 100 | 121 | 102 | 124
Included in Earnings |  | 1 |  | 1
Included in other comprehensive income | (1) | (1) | (1) |
Settlements | (3) | (4) | (5) | (8)
Ending Balance | 96 | 117 | 96 | 117
Securities available for sale | Other |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Beginning Balance | 53 | 53 | 55 | 55
Included in Earnings |  |  | (2) |
Included in other comprehensive income |  |  | 1 | (4)
Purchases | 3 | 3 | 3 | 3
Settlements | (2) | (2) | (3) | (3)
Transfers into Level 3 |  |  |  | 3
Ending Balance | 54 | 54 | 54 | 54
Unrealized gains/losses on assets held on Consolidated Balance Sheet |  |  | (2) |
Loans |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Beginning Balance | 713 | 757 | 726 | 769
Included in Earnings | 4 | 3 | 8 | 6
Included in other comprehensive income |  |  |  |
Purchases | 7 | 11 | 12 | 20
Sales | (2) | (1) | (2) | (1)
Settlements | (18) | (28) | (38) | (50)
Transfers into Level 3 |  | 8 |  | 15
Transfers out of Level 3 | (3) | (5) | (5) | (14)
Ending Balance | 701 | 745 | 701 | 745
Unrealized gains/losses on assets held on Consolidated Balance Sheet | 4 | 3 | 8 | 6
Equity investments |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Beginning Balance | 2,030 | 1,835 | 1,952 | 1,778
Included in Earnings | 31 | 24 | 26 | 145
Purchases | 47 | 92 | 136 | 232
Sales | (78) | (328) | (84) | (398)
Transfers out of Level 3 |  |  |  | (134)
Ending Balance | 2,030 | 1,623 | 2,030 | 1,623
Unrealized gains/losses on assets held on Consolidated Balance Sheet | 23 | 2 | 18 | 119
Mortgage Servicing Rights | Residential mortgage loans held for sale |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Beginning Balance | 2,687 | 2,232 | 2,654 | 2,310
Included in Earnings | 16 | 81 | 88 | 33
Purchases | 16 | 91 | 29 | 109
Issuances | 7 | 5 | 12 | 10
Settlements | (69) | (60) | (126) | (113)
Ending Balance | 2,657 | 2,349 | 2,657 | 2,349
Unrealized gains/losses on assets held on Consolidated Balance Sheet | 16 | 80 | 88 | 33
Mortgage Servicing Rights | Commercial mortgage loans held for sale |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Beginning Balance | 1,075 | 1,061 | 1,032 | 1,113
Included in Earnings | 65 | 99 | 172 | 108
Purchases | 12 | 9 | 24 | 17
Issuances | 8 | 19 | 11 | 32
Settlements | (78) | (82) | (157) | (164)
Ending Balance | 1,082 | 1,106 | 1,082 | 1,106
Unrealized gains/losses on assets held on Consolidated Balance Sheet | 65 | 100 | 172 | 108
Financial derivatives |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Beginning Balance | 9 | 19 | 6 | 5
Included in Earnings | 9 | (10) | 18 | 7
Purchases | 2 | 2 | 2 | 3
Settlements | (8) | (5) | (14) | (9)
Ending Balance | 12 | 6 | 12 | 6
Unrealized gains/losses on assets held on Consolidated Balance Sheet | 11 | 4 | 21 | 10
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Beginning Balance | 113 | 97 | 152 | 123
Included in Earnings | 110 | 79 | 118 | 118
Sales | 2 | 1 | 2 | 3
Settlements | (42) | (37) | (89) | (104)
Ending Balance | 183 | 140 | 183 | 140
Unrealized gains/losses on liabilities held on Consolidated Balance Sheet | 115 | 80 | 120 | 122
Other assets |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Beginning Balance | 8 |  | 8 |
Purchases |  |  |  |
Ending Balance | 8 |  | 8 |
Other borrowed funds |  |  |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Beginning Balance | 9 | 5 | 9 | 4
Issuances | 4 | 3 | 7 | 6
Settlements | (4) | (3) | (7) | (5)
Ending Balance | 9 | 5 | 9 | 5
Other liabilities |  |  |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Beginning Balance | 189 | 229 | 237 | 294
Included in Earnings | 6 | 31 | (14) | 55
Issuances | 15 | 89 | 28 | 107
Settlements | (16) | (110) | (57) | (217)
Ending Balance | 194 | 239 | 194 | 239
Unrealized gains/losses on liabilities held on Consolidated Balance Sheet | $ 7 | $ 21 | $ 9 | $ 42

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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 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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