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Financial Instruments - Derivative Activities Table (Details) - Investment Segment - USD ($) $ in Millions | Mar. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Equity contracts |  |  |
Derivative [Line Items] |  |  |
Long Notional Exposure |  | $ 217 | $ 0
Short Notional Exposure |  | 4,074 | 8,623
Credit contracts |  |  |
Derivative [Line Items] |  |  |
Long Notional Exposure | [1] | 8 | 0
Short Notional Exposure | [1] | 4,113 | 2,099
Credit Default Swap |  |  |
Derivative [Line Items] |  |  |
Short notional amount of credit default swap positions |  | $ 8,200 | $ 6,300
[1] | The short notional amount on our credit default swap positions was approximately $8.2 billion at March 31, 2021. However, because credit spreads cannot compress below zero, our downside short notional exposure to loss is approximately $4.1 billion as of March 31, 2021. The short notional amount on our credit default swap positions was approximately $6.3 billion as of December 31, 2020. However, because credit spreads cannot compress below zero, our downside short notional exposure to loss is approximately $2.1 billion as of December 31, 2020.

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