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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, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Beginning Balance | $ 6,987 | $ 6,546 | $ 7,252 | $ 5,882
Included in Earnings | 348 | 481 | 656 | 1,283
Included in other comprehensive income | (22) | (21) | (22) | (102)
Purchases | 577 | 497 | 970 | 966
Sales | (186) | (311) | (627) | (425)
Issuances | 13 | 28 | 55 | 101
Settlements | (233) | (207) | (658) | (676)
Transfers into Level 3 | 99 | 8 | 120 | 22
Transfers out of Level 3 | (10) | (16) | (173) | (46)
Ending Balance | 7,573 | 7,005 | 7,573 | 7,005
Unrealized gains/losses on assets held on Consolidated Balance Sheet | 337 | 379 | 613 | 1,183
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Beginning Balance | 384 | 398 | 421 | 463
Included in Earnings | 56 | 15 | 229 | 59
Purchases |  | 32 |  | 32
Sales | 2 | 4 | 5 | 10
Issuances | 332 | 362 | 445 | 608
Settlements | (409) | (420) | (735) | (781)
Ending Balance | 365 | 391 | 365 | 391
Unrealized gains/losses on liabilities held on Consolidated Balance Sheet | 51 | 17 | 214 | 61
Fair Value Additional Information [Abstract] |  |  |  |
Net gains (losses) included in earnings (realized and unrealized) relating to Level 3 assets and liabilities | 292 | 466 | 427 | 1,224
Net unrealized gains (losses) relating to Level 3 assets and liabilities | 286 | 362 | 399 | 1,122
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 | 191 | 83 | 243 | 81
Included in Earnings | (3) | (4) | (3) | (6)
Purchases | 3 | 46 | 12 | 91
Sales | (89) | (1) | (131) | (33)
Settlements | (2) | (2) | (9) | (11)
Transfers into Level 3 | 1 | 8 | 4 | 22
Transfers out of Level 3 | (4) | (14) | (19) | (28)
Ending Balance | 97 | 116 | 97 | 116
Unrealized gains/losses on assets held on Consolidated Balance Sheet | (4) | (4) | (3) | (6)
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 | 25 | 38 | 33 | 49
Included in Earnings |  |  |  | (4)
Settlements |  | (3) | (8) | (10)
Ending Balance | 25 | 35 | 25 | 35
Unrealized gains/losses on assets held on Consolidated Balance Sheet |  |  |  | (4)
Non-agency | Residential mortgage-backed |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Beginning Balance | 768 |  | 819 |
Included in Earnings | 5 |  | 13 |
Included in other comprehensive income | (20) |  | (16) |
Settlements | (40) |  | (103) |
Ending Balance | 713 |  | 713 |
Non-agency | Commercial mortgage-backed |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Beginning Balance | 3 |  | 3 |
Transfers into Level 3 | 92 |  | 92 |
Ending Balance | 95 |  | 95 |
Securities available for sale |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Beginning Balance | 942 | 1,133 | 1,001 | 1,332
Included in Earnings | 4 | 4 | 13 | 20
Included in other comprehensive income | (22) | (21) | (22) | (102)
Purchases | 3 |  | 6 | 3
Sales |  |  |  |
Settlements | (52) | (46) | (126) | (183)
Transfers into Level 3 | 92 |  | 95 |
Ending Balance | 967 | 1,070 | 967 | 1,070
Securities available for sale | Residential mortgage-backed |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Beginning Balance |  | 925 |  | 1,097
Included in Earnings |  | 4 |  | 19
Included in other comprehensive income |  | (18) |  | (84)
Settlements |  | (40) |  | (161)
Ending Balance |  | 871 |  | 871
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 | 117 | 138 | 124 | 163
Included in Earnings |  |  | 1 | 1
Included in other comprehensive income | (3) | (5) | (3) | (18)
Settlements | (11) | (6) | (19) | (19)
Ending Balance | 103 | 127 | 103 | 127
Securities available for sale | Other |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Beginning Balance | 54 | 67 | 55 | 69
Included in Earnings | (1) |  | (1) |
Included in other comprehensive income | 1 | 2 | (3) |
Purchases | 3 |  | 6 | 3
Settlements | (1) |  | (4) | (3)
Transfers into Level 3 |  |  | 3 |
Ending Balance | 56 | 69 | 56 | 69
Loans |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Beginning Balance | 745 | 804 | 769 | 884
Included in Earnings | 5 | (1) | 11 | 20
Purchases | 19 | 11 | 39 | 31
Sales |  | (2) | (1) | (10)
Settlements | (27) | (35) | (77) | (132)
Transfers into Level 3 | 2 |  | 17 |
Transfers out of Level 3 | (6) | (2) | (20) | (18)
Ending Balance | 738 | 775 | 738 | 775
Unrealized gains/losses on assets held on Consolidated Balance Sheet | 5 |  | 11 | 20
Equity investments |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Beginning Balance | 1,623 | 1,867 | 1,778 | 1,680
Included in Earnings | (9) | 167 | 136 | 312
Purchases | 212 | 69 | 444 | 185
Sales | (97) | (308) | (495) | (382)
Transfers out of Level 3 |  |  | (134) |
Ending Balance | 1,729 | 1,795 | 1,729 | 1,795
Unrealized gains/losses on assets held on Consolidated Balance Sheet | (16) | 65 | 103 | 211
Mortgage Servicing Rights | Residential mortgage loans held for sale |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Beginning Balance | 2,349 | 1,620 | 2,310 | 1,078
Included in Earnings | 215 | 135 | 248 | 505
Purchases | 329 | 363 | 438 | 620
Issuances | 7 | 11 | 17 | 49
Settlements | (63) | (55) | (176) | (178)
Ending Balance | 2,837 | 2,074 | 2,837 | 2,074
Unrealized gains/losses on assets held on Consolidated Balance Sheet | 215 | 135 | 248 | 506
Mortgage Servicing Rights | Commercial mortgage loans held for sale |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Beginning Balance | 1,106 | 988 | 1,113 | 740
Included in Earnings | 130 | 176 | 238 | 438
Purchases | 10 | 7 | 27 | 32
Issuances | 6 | 17 | 38 | 52
Settlements | (83) | (56) | (247) | (130)
Ending Balance | 1,169 | 1,132 | 1,169 | 1,132
Unrealized gains/losses on assets held on Consolidated Balance Sheet | 130 | 176 | 238 | 438
Financial derivatives |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Beginning Balance | 6 | 13 | 5 | 38
Included in Earnings | 6 | 4 | 13 | (2)
Purchases |  | 1 | 3 | 4
Settlements | (6) | (10) | (15) | (32)
Ending Balance | 6 | 8 | 6 | 8
Unrealized gains/losses on assets held on Consolidated Balance Sheet | 7 | 7 | 16 | 18
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Beginning Balance | 140 | 213 | 123 | 285
Included in Earnings | 50 | (11) | 168 | 12
Sales | 2 | 4 | 5 | 10
Settlements | (84) | (86) | (188) | (187)
Ending Balance | 108 | 120 | 108 | 120
Unrealized gains/losses on liabilities held on Consolidated Balance Sheet | 51 | (7) | 173 | 22
Other assets |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Purchases | 1 |  | 1 |
Transfers into Level 3 | 4 |  | 4 |
Ending Balance | 5 |  | 5 |
Other borrowed funds |  |  |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Beginning Balance | 5 | 3 | 4 | 3
Issuances | 3 |  | 9 | 4
Settlements | (1) | (1) | (6) | (5)
Ending Balance | 7 | 2 | 7 | 2
Other liabilities |  |  |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Beginning Balance | 239 | 182 | 294 | 175
Included in Earnings | 6 | 26 | 61 | 47
Purchases |  | (32) |  | 32
Issuances | 329 | 362 | 436 | 604
Settlements | (324) | (333) | (541) | (589)
Ending Balance | $ 250 | 269 | 250 | 269
Unrealized gains/losses on liabilities held on Consolidated Balance Sheet |  | $ 24 | $ 41 | $ 39

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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 -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/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 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 -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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