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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
--- | ---
Mar. 31, 2021 | Mar. 31, 2020
Derivative Instruments, Gain (Loss) [Line Items] |  |
Interest and dividend income, securities | $ 391 | $ 530
Interest and fee income, loans | 5,854 | 6,542
Interest and dividend income, other | 16 | 37
Deposits | (269) | (731)
Securitized debt obligations | (32) | (99)
Senior and subordinated notes | (129) | (239)
Non-interest income | 118 | 145
Amortization expense (benefit) | (22) | 36
Non interest income - Other |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Realized losses (gains) on foreign exchange contracts reclassified from AOCI | (85) | (392)
Fair value hedges | Interest income - Investment securities |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Net income (expense) recognized on fair value hedges | (30) | (11)
Fair value hedges | Interest income - Loans |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Net income (expense) recognized on fair value hedges | 0 | 0
Fair value hedges | Interest income - Other |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Net income (expense) recognized on fair value hedges | 0 | 0
Fair value hedges | Interest expense - Deposits |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Net income (expense) recognized on fair value hedges | 36 | (1)
Fair value hedges | Interest expense - Securitized Debt Obligation |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Net income (expense) recognized on fair value hedges | 28 | 2
Fair value hedges | Interest expense - Senior and Subordinated Debt |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Net income (expense) recognized on fair value hedges | 93 | 15
Fair value hedges | Non interest income - Other |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Net income (expense) recognized on fair value hedges | 0 | 0
Fair value hedges | Interest rate contracts | Interest income - Investment securities |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Interest recognized on derivatives | (25) | (11)
Gains (losses) recognized on derivatives | 100 | (338)
Gains (losses) recognized on hedged items | (105) | 338
Gain (Loss) from Components Excluded from Assessment of Fair Value Hedge Effectiveness, Net | 0 | 0
Fair value hedges | Interest rate contracts | Interest income - Loans |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Interest recognized on derivatives | 0 | 0
Gains (losses) recognized on derivatives | 0 | 0
Gains (losses) recognized on hedged items | 0 | 0
Gain (Loss) from Components Excluded from Assessment of Fair Value Hedge Effectiveness, Net | 0 | 0
Fair value hedges | Interest rate contracts | Interest income - Other |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Interest recognized on derivatives | 0 | 0
Gains (losses) recognized on derivatives | 0 | 0
Gains (losses) recognized on hedged items | 0 | 0
Gain (Loss) from Components Excluded from Assessment of Fair Value Hedge Effectiveness, Net | 0 | 0
Fair value hedges | Interest rate contracts | Interest expense - Deposits |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Interest recognized on derivatives | 36 | (2)
Gains (losses) recognized on derivatives | (58) | 287
Gains (losses) recognized on hedged items | 58 | (286)
Gain (Loss) from Components Excluded from Assessment of Fair Value Hedge Effectiveness, Net | 0 | 0
Fair value hedges | Interest rate contracts | Interest expense - Securitized Debt Obligation |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Interest recognized on derivatives | 33 | 12
Gains (losses) recognized on derivatives | (80) | 282
Gains (losses) recognized on hedged items | 75 | (292)
Gain (Loss) from Components Excluded from Assessment of Fair Value Hedge Effectiveness, Net | 0 | 0
Fair value hedges | Interest rate contracts | Interest expense - Senior and Subordinated Debt |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Interest recognized on derivatives | 62 | 39
Gains (losses) recognized on derivatives | (336) | 1,068
Gains (losses) recognized on hedged items | 368 | (1,091)
Gain (Loss) from Components Excluded from Assessment of Fair Value Hedge Effectiveness, Net | (1) | (1)
Fair value hedges | Interest rate contracts | Non interest income - Other |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Interest recognized on derivatives | 0 | 0
Gains (losses) recognized on derivatives | (61) | (23)
Gains (losses) recognized on hedged items | 61 | 23
Gain (Loss) from Components Excluded from Assessment of Fair Value Hedge Effectiveness, Net | 0 | 0
Cash flow hedges | Interest income - Investment securities |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Net income recognized on cash flow hedges | 9 | 2
Cash flow hedges | Interest income - Loans |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Net income recognized on cash flow hedges | 226 | 24
Cash flow hedges | Interest income - Other |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Net income recognized on cash flow hedges | 1 | 7
Cash flow hedges | Interest expense - Deposits |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Net income recognized on cash flow hedges | 0 | 0
Cash flow hedges | Interest expense - Securitized Debt Obligation |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Net income recognized on cash flow hedges | 0 | 0
Cash flow hedges | Interest expense - Senior and Subordinated Debt |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Net income recognized on cash flow hedges | 0 | 0
Cash flow hedges | Non interest income - Other |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Net income recognized on cash flow hedges | 0 | 0
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 | 9 | 2
Cash flow hedges | Interest rate contracts | Interest income - Loans |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Reclassification adjustment from AOCI on derivatives, net of tax | 226 | 24
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
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
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
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
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
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
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
Cash flow hedges | Foreign exchange contracts | Interest income - Other |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Reclassification adjustment from AOCI on derivatives, net of tax | 1 | 7
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
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
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
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

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