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Fair Value of Assets and Liabilities (Derivative Assets and Liabilities Measured at Fair Value on a Recurring Basis) (Details) - USD ($) $ in Millions | Mar. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total derivative assets | $ 1,847 | $ 1,906
Netting | (12,532) | (21,367)
Total derivative liabilities | 1,575 | 792
Netting | (18,781) | (17,475)
Interest Rate |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total derivative assets | 11,024 | 19,190
Total derivative liabilities | 16,456 | 13,508
Currency |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total derivative assets | 1,068 | 832
Total derivative liabilities | 1,243 | 763
Credit |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total derivative assets | 50 | 63
Total derivative liabilities | 0 | 28
Currency/Interest Rate |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total derivative assets | 1,447 | 1,415
Total derivative liabilities | 1,293 | 1,638
Equity |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total derivative assets | 790 | 1,773
Total derivative liabilities | 1,364 | 2,330
Other |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total derivative assets | 0 | 0
Total derivative liabilities | 0 | 0
Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total derivative assets | 97 | 227
Total derivative liabilities | 82 | 30
Level 1 | Interest Rate |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total derivative assets | 15 | 99
Total derivative liabilities | 65 | 5
Level 1 | Currency |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total derivative assets | 0 | 0
Total derivative liabilities | 0 | 0
Level 1 | Credit |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total derivative assets | 0 | 0
Total derivative liabilities | 0 | 0
Level 1 | Currency/Interest Rate |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total derivative assets | 0 | 0
Total derivative liabilities | 0 | 0
Level 1 | Equity |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total derivative assets | 82 | 128
Total derivative liabilities | 17 | 25
Level 1 | Other |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total derivative assets | 0 | 0
Total derivative liabilities | 0 | 0
Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total derivative assets | 14,282 | 23,046
Total derivative liabilities | 20,274 | 18,237
Level 2 | Interest Rate |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total derivative assets | 11,009 | 19,091
Total derivative liabilities | 16,391 | 13,503
Level 2 | Currency |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total derivative assets | 1,068 | 832
Total derivative liabilities | 1,243 | 763
Level 2 | Credit |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total derivative assets | 50 | 63
Total derivative liabilities | 0 | 28
Level 2 | Currency/Interest Rate |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total derivative assets | 1,447 | 1,415
Total derivative liabilities | 1,293 | 1,638
Level 2 | Equity |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total derivative assets | 708 | 1,645
Total derivative liabilities | 1,347 | 2,305
Level 2 | Other |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total derivative assets | 0 | 0
Total derivative liabilities | 0 | 0
Level 3 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total derivative assets | 0 | 0
Total derivative liabilities | 0 | 0
Level 3 | Interest Rate |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total derivative assets | 0 | 0
Total derivative liabilities | 0 | 0
Level 3 | Currency |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total derivative assets | 0 | 0
Total derivative liabilities | 0 | 0
Level 3 | Credit |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total derivative assets | 0 | 0
Total derivative liabilities | 0 | 0
Level 3 | Currency/Interest Rate |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total derivative assets | 0 | 0
Total derivative liabilities | 0 | 0
Level 3 | Equity |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total derivative assets | 0 | 0
Total derivative liabilities | 0 | 0
Level 3 | Other |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total derivative assets | 0 | 0
Total derivative liabilities | 0 | 0
Fair Value, Measurements, Recurring |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Netting | $ 6,249 | $ (3,892)

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