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Derivative Instruments and Hedging Activities - Effects of Fair Value and Cash Flow Hedge Accounting (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Interest and dividend income, securities | $ 317 | $ 443 | $ 1,078 | $ 1,455
Interest and fee income, loans | 6,205 | 5,758 | 17,812 | 18,120
Interest and dividend income, other | 16 | 14 | 48 | 67
Deposits | (228) | (476) | (734) | (1,818)
Securitized debt obligations | (29) | (43) | (89) | (198)
Senior and subordinated notes | (116) | (132) | (367) | (551)
Non-interest income | 243 | 706 | 592 | 1,017
Amortization expense (benefit) | 34 | 19 | (10) | (34)
Non interest income - Other |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Realized losses (gains) on foreign exchange contracts reclassified from AOCI | (83) | 73 | (245) | (20)
Fair value hedges | Interest income - Investment securities |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Net income (expense) recognized on fair value hedges | (89) | (30) | (151) | (62)
Fair value hedges | Interest income - Loans |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Net income (expense) recognized on fair value hedges | 0 | 0 | 0 | 0
Fair value hedges | Interest income - Other |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Net income (expense) recognized on fair value hedges | 0 | 0 | 0 | 0
Fair value hedges | Interest expense - Deposits |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Net income (expense) recognized on fair value hedges | 30 | 45 | 100 | 70
Fair value hedges | Interest expense - Securitized Debt Obligation |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Net income (expense) recognized on fair value hedges | 27 | 33 | 79 | 62
Fair value hedges | Interest expense - Senior and Subordinated Debt |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Net income (expense) recognized on fair value hedges | 80 | 94 | 262 | 173
Fair value hedges | Non interest income - Other |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Net income (expense) recognized on fair value hedges | 0 | 0 | 0 | 0
Fair value hedges | Interest rate contracts | Interest income - Investment securities |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Interest recognized on derivatives | (25) | (23) | (75) | (51)
Gains (losses) recognized on derivatives | 19 | 24 | 130 | (340)
Gains (losses) recognized on hedged items | (83) | (31) | (206) | 329
Gain (Loss) from Components Excluded from Assessment of Fair Value Hedge Effectiveness, Net | 0 | 0 | 0 | 0
Fair value hedges | Interest rate contracts | Interest income - Loans |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Interest recognized on derivatives | 0 | 0 | 0 | 0
Gains (losses) recognized on derivatives | 0 | 0 | 0 | 0
Gains (losses) recognized on hedged items | 0 | 0 | 0 | 0
Gain (Loss) from Components Excluded from Assessment of Fair Value Hedge Effectiveness, Net | 0 | 0 | 0 | 0
Fair value hedges | Interest rate contracts | Interest income - Other |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Interest recognized on derivatives | 0 | 0 | 0 | 0
Gains (losses) recognized on derivatives | 0 | 0 | 0 | 0
Gains (losses) recognized on hedged items | 0 | 0 | 0 | 0
Gain (Loss) from Components Excluded from Assessment of Fair Value Hedge Effectiveness, Net | 0 | 0 | 0 | 0
Fair value hedges | Interest rate contracts | Interest expense - Deposits |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Interest recognized on derivatives | 31 | 44 | 101 | 69
Gains (losses) recognized on derivatives | (28) | (47) | (117) | 249
Gains (losses) recognized on hedged items | 27 | 48 | 116 | (248)
Gain (Loss) from Components Excluded from Assessment of Fair Value Hedge Effectiveness, Net | 0 | 0 | 0 | 0
Fair value hedges | Interest rate contracts | Interest expense - Securitized Debt Obligation |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Interest recognized on derivatives | 30 | 40 | 93 | 92
Gains (losses) recognized on derivatives | (57) | (48) | (154) | 221
Gains (losses) recognized on hedged items | 54 | 41 | 140 | (251)
Gain (Loss) from Components Excluded from Assessment of Fair Value Hedge Effectiveness, Net | 0 | 0 | 0 | 0
Fair value hedges | Interest rate contracts | Interest expense - Senior and Subordinated Debt |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Interest recognized on derivatives | 50 | 56 | 168 | 166
Gains (losses) recognized on derivatives | (72) | (72) | (408) | 1,057
Gains (losses) recognized on hedged items | 103 | 111 | 504 | (1,048)
Gain (Loss) from Components Excluded from Assessment of Fair Value Hedge Effectiveness, Net | (1) | (1) | (2) | (2)
Fair value hedges | Interest rate contracts | Non interest income - Other |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Interest recognized on derivatives | 0 | 0 | 0 | 0
Gains (losses) recognized on derivatives | (34) | 61 | (79) | 64
Gains (losses) recognized on hedged items | 34 | (61) | 79 | (64)
Gain (Loss) from Components Excluded from Assessment of Fair Value Hedge Effectiveness, Net | 0 | 0 | 0 | 0
Cash flow hedges | Interest income - Investment securities |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Net income (expense) recognized on cash flow hedges | 10 | 8 | 30 | 17
Cash flow hedges | Interest income - Loans |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Net income (expense) recognized on cash flow hedges | 240 | 171 | 700 | 330
Cash flow hedges | Interest income - Other |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Net income (expense) recognized on cash flow hedges | 0 | 1 | 1 | 10
Cash flow hedges | Interest expense - Deposits |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Net income (expense) recognized on cash flow hedges | 0 | 0 | 0 | 0
Cash flow hedges | Interest expense - Securitized Debt Obligation |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Net income (expense) recognized on cash flow hedges | 0 | 0 | 0 | 0
Cash flow hedges | Interest expense - Senior and Subordinated Debt |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Net income (expense) recognized on cash flow hedges | 0 | 0 | 0 | 0
Cash flow hedges | Non interest income - Other |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Net income (expense) recognized on cash flow hedges | 0 | 0 | 1 | (2)
Cash flow hedges | Interest rate contracts | Interest income - Investment securities |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Reclassification adjustment from AOCI on derivatives, net of tax | 10 | 8 | 30 | 17
Cash flow hedges | Interest rate contracts | Interest income - Loans |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Reclassification adjustment from AOCI on derivatives, net of tax | 240 | 171 | 700 | 330
Cash flow hedges | Interest rate contracts | Interest income - Other |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Reclassification adjustment from AOCI on derivatives, net of tax | 0 | 0 | 0 | 0
Cash flow hedges | Interest rate contracts | Interest expense - Deposits |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Reclassification adjustment from AOCI on derivatives, net of tax | 0 | 0 | 0 | 0
Cash flow hedges | Interest rate contracts | Interest expense - Securitized Debt Obligation |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Reclassification adjustment from AOCI on derivatives, net of tax | 0 | 0 | 0 | 0
Cash flow hedges | Interest rate contracts | Interest expense - Senior and Subordinated Debt |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Reclassification adjustment from AOCI on derivatives, net of tax | 0 | 0 | 0 | 0
Cash flow hedges | Interest rate contracts | Non interest income - Other |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Reclassification adjustment from AOCI on derivatives, net of tax | 0 | 0 | 0 | 0
Cash flow hedges | Foreign exchange contracts | Interest income - Investment securities |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Reclassification adjustment from AOCI on derivatives, net of tax | 0 | 0 | 0 | 0
Cash flow hedges | Foreign exchange contracts | Interest income - Loans |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Reclassification adjustment from AOCI on derivatives, net of tax | 0 | 0 | 0 | 0
Cash flow hedges | Foreign exchange contracts | Interest income - Other |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Reclassification adjustment from AOCI on derivatives, net of tax | 0 | 1 | 1 | 10
Cash flow hedges | Foreign exchange contracts | Interest expense - Deposits |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Reclassification adjustment from AOCI on derivatives, net of tax | 0 | 0 | 0 | 0
Cash flow hedges | Foreign exchange contracts | Interest expense - Securitized Debt Obligation |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Reclassification adjustment from AOCI on derivatives, net of tax | 0 | 0 | 0 | 0
Cash flow hedges | Foreign exchange contracts | Interest expense - Senior and Subordinated Debt |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Reclassification adjustment from AOCI on derivatives, net of tax | 0 | 0 | 0 | 0
Cash flow hedges | Foreign exchange contracts | Non interest income - Other |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Reclassification adjustment from AOCI on derivatives, net of tax | $ 0 | $ 0 | $ 1 | $ (2)

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