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Derivatives and Hedging Activities - Fair Values, Volume of Activity and Gain (Loss) Information Related to Derivative Instruments (Details) - USD ($) $ in Millions | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Derivatives, Fair Value [Line Items] |  |
Notional Amount | $ 126,077 | $ 102,645
Derivative assets, Netting adjustments | (473) | (333)
Derivative assets, Fair Value | 778 | 529
Derivative liabilities, Netting adjustments | (335) | (337)
Derivative liabilities, Fair Value | 156 | 353
Designated as Hedging Instrument [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Notional Amount | 39,208 | 28,668
Derivative assets, Fair Value | 191 | 52
Derivative liabilities, Fair Value | 20 | (10)
Not Designated as Hedging Instrument [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Notional Amount | 86,869 | 73,977
Derivative assets, Fair Value | 1,062 | 812
Derivative liabilities, Fair Value | 513 | 733
Interest Rate [Member] | Designated as Hedging Instrument [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Notional Amount | 39,208 | 28,546
Derivative assets, Fair Value | 191 | 50
Derivative liabilities, Fair Value | 20 | (10)
Interest Rate [Member] | Not Designated as Hedging Instrument [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Notional Amount | 71,209 | 63,454
Derivative assets, Fair Value | 772 | 365
Derivative liabilities, Fair Value | 233 | 307
Foreign Exchange Contract [Member] | Designated as Hedging Instrument [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Notional Amount | 0 | 122
Derivative assets, Fair Value | 0 | 2
Derivative liabilities, Fair Value | 0 | 0
Foreign Exchange Contract [Member] | Not Designated as Hedging Instrument [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Notional Amount | 6,572 | 6,829
Derivative assets, Fair Value | 67 | 104
Derivative liabilities, Fair Value | 60 | 95
Commodity [Member] | Not Designated as Hedging Instrument [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Notional Amount | 5,324 | 2,002
Derivative assets, Fair Value | 208 | 333
Derivative liabilities, Fair Value | 200 | 323
Credit [Member] | Not Designated as Hedging Instrument [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Notional Amount | 427 | 226
Derivative assets, Fair Value | 1 | 1
Derivative liabilities, Fair Value | 10 | 1
Other [Member] | Not Designated as Hedging Instrument [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Notional Amount | 3,337 | 1,466
Derivative assets, Fair Value | 14 | 9
Derivative liabilities, Fair Value | 10 | 7
Net Derivatives [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Notional Amount | 126,077 | 102,645
Derivative assets, Fair Value | 780 | 531
Derivative liabilities, Fair Value | 198 | 386
Counterparty And Cash Collateral Netting [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Notional Amount | 0 | 0
Derivative assets, Fair Value | (2) | (2)
Derivative liabilities, Fair Value | $ (42) | $ (33)

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