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v3.20.2

Commitments, Contingencies and Guarantees (Narrative) (Details) |  |  | 9 Months Ended
--- | --- | --- | ---
Aug. 10, 2020 USD ($) | Apr. 20, 2020 USD ($) $ / bbl | Sep. 30, 2020 USD ($)
Commitment And Contingencies [Line Items] |  |  |
Aggregate loss on securities |  |  | $ 42,000,000
Maximum aggregate loss, if securities' price falls to zero and no debts collected |  |  | 50,000,000
Guarantees, Fair Value Disclosure |  |  | $ 0
Oil and Gas, Average Sale Price | $ / bbl |  | (37.63) |
Aggregate provisionary loss |  | $ 88,000,000 |
Recognized loss |  | $ 104,000,000 |
FINRA [Member] |  |  |
Commitment And Contingencies [Line Items] |  |  |
Settlement, penalties agreed to paid | $ 15,000,000 |  |
SEC [Member] |  |  |
Commitment And Contingencies [Line Items] |  |  |
Settlement, penalties agreed to paid | 11,500,000 |  |
CFTC [Member] |  |  |
Commitment And Contingencies [Line Items] |  |  |
Settlement, penalties agreed to paid | 11,500,000 |  |
Disgorgement [Member] |  |  |
Commitment And Contingencies [Line Items] |  |  |
Settlement, penalties agreed to paid | $ 700,000 |  |

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