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Fair Value (Reconciliation of Recurring Fair Value Measurements) (Details) - Fair Value, Measurements, Recurring - Level 3 - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Beginning Balance | $ 5,395 | $ 6,157
Included in Earnings | (255) | 89
Included in Other comprehensive income (b) | (94) | 12
Purchases | 781 | 769
Sales | (231) | (662)
Issuances | 145 | 89
Settlements | (612) | (1,027)
Transfers into Level 3 | 112 | 16
Transfers out of Level 3 | (104) | (48)
Ending Balance | 5,137 | 5,395
Unrealized gains (losses) on assets held on Consolidated Balance Sheet | (301) | (163)
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Beginning Balance | 344 | 333
Included in Earnings | 206 | 169
Purchases |  | 16
Sales | 4 | 12
Issuances | 124 | 133
Settlements | (360) | (319)
Ending Balance | 318 | 344
Unrealized gains or (losses) on liabilities held on Consolidated Balance Sheet | 187 | 161
Fair Value Additional Information [Abstract] |  |
Net gains (losses) included in earnings (realized and unrealized) relating to Level 3 assets and liabilities | (461) | (80)
Net unrealized gains (losses) relating to Level 3 assets and liabilities | (488) | (324)
Loans Held For Sale | Residential Mortgages |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Beginning Balance | 2 | 2
Included in Earnings | (1) |
Purchases | 124 | 5
Sales | (13) | (2)
Settlements | (21) | (2)
Transfers into Level 3 | 93 | 16
Transfers out of Level 3 | (21) | (17)
Ending Balance | 163 | 2
Unrealized gains (losses) on assets held on Consolidated Balance Sheet | (1) |
Loans Held For Sale | Commercial Mortgages |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Beginning Balance | 64 | 87
Included in Earnings | (2) | 1
Settlements | (5) | (24)
Ending Balance | 57 | 64
Unrealized gains (losses) on assets held on Consolidated Balance Sheet | (2) | 1
Securities available for sale |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Beginning Balance | 2,055 | 2,486
Included in Earnings | 60 | 80
Included in Other comprehensive income (b) | (94) | 12
Purchases | 4 | 9
Sales |  | (3)
Settlements | (397) | (529)
Transfers into Level 3 | 19 |
Transfers out of Level 3 |  |
Ending Balance | 1,647 | 2,055
Securities available for sale | Residential mortgage-backed Securities |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Beginning Balance | 1,741 | 2,128
Included in Earnings | 53 | 73
Included in Other comprehensive income (b) | (75) | 15
Settlements | (354) | (475)
Ending Balance | 1,365 | 1,741
Securities available for sale | Commercial mortgage- backed non-agency |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Beginning Balance |  |
Included in Other comprehensive income (b) | (8) |
Transfers into Level 3 | 19 |
Ending Balance | 11 |
Securities available for sale | Asset-backed |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Beginning Balance | 240 | 274
Included in Earnings | 6 | 6
Included in Other comprehensive income (b) | (7) | 3
Settlements | (40) | (43)
Ending Balance | 199 | 240
Securities available for sale | Other debt |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Beginning Balance | 74 | 84
Included in Earnings | 1 | 1
Included in Other comprehensive income (b) | (4) | (6)
Purchases | 4 | 9
Sales |  | (3)
Settlements | (3) | (11)
Ending Balance | 72 | 74
Loans |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Beginning Balance | 300 | 272
Included in Earnings | 28 | 13
Purchases | 161 | 142
Sales | (39) | (42)
Settlements | 280 | (54)
Transfers out of Level 3 | (83) | (31)
Ending Balance | 647 | 300
Unrealized gains (losses) on assets held on Consolidated Balance Sheet | 28 | 7
Equity investments |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Beginning Balance | 1,276 | 1,255
Included in Earnings | (63) | 262
Purchases | 229 | 374
Sales | (179) | (615)
Ending Balance | 1,263 | 1,276
Unrealized gains (losses) on assets held on Consolidated Balance Sheet | (69) | 57
Mortgage Servicing Rights | Residential Mortgages |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Beginning Balance | 995 | 1,257
Included in Earnings | (377) | (250)
Purchases | 208 | 114
Issuances | 45 | 36
Settlements | (198) | (162)
Ending Balance | 673 | 995
Unrealized gains (losses) on assets held on Consolidated Balance Sheet | (377) | (235)
Mortgage Servicing Rights | Commercial Mortgages |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Beginning Balance | 649 | 726
Included in Earnings | (109) | (87)
Purchases | 44 | 103
Issuances | 100 | 53
Settlements | (115) | (146)
Ending Balance | 569 | 649
Unrealized gains (losses) on assets held on Consolidated Balance Sheet | (109) | (87)
Trading securities |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Beginning Balance |  | 2
Settlements |  | (2)
Ending Balance |  |
Financial derivatives |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Beginning Balance | 54 | 25
Included in Earnings | 209 | 70
Purchases | 11 | 22
Settlements | (156) | (63)
Ending Balance | 118 | 54
Unrealized gains (losses) on assets held on Consolidated Balance Sheet | 229 | 94
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Beginning Balance | 200 | 268
Included in Earnings | 189 | 101
Sales | 4 | 10
Settlements | (120) | (179)
Ending Balance | 273 | 200
Unrealized gains or (losses) on liabilities held on Consolidated Balance Sheet | 186 | 112
Other assets |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Beginning Balance |  | 45
Settlements |  | (45)
Ending Balance |  |
Other borrowed funds |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Beginning Balance | 7 | 7
Issuances | 28 | 52
Settlements | (33) | (52)
Ending Balance | 2 | 7
Other liabilities |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Beginning Balance | 137 | 58
Included in Earnings | 17 | 68
Purchases |  | 16
Sales |  | 2
Issuances | 96 | 81
Settlements | (207) | (88)
Ending Balance | 43 | 137
Unrealized gains or (losses) on liabilities held on Consolidated Balance Sheet | $ 1 | $ 49

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