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Investments - Investment Segment - Ownership (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019 | Mar. 31, 2020 | Dec. 31, 2019
Summary of Investment Holdings [Line Items] |  |  |  |  |  |
Fair value of investments | $ 2,971 |  | $ 2,971 |  |  | $ 3,137
Gains (Losses) Recognized in Income | $ 868 | $ (66) | $ (577) | $ (113) |  |
Herbalife |  |  |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |  |  |
Voting Interests | 23.80% |  | 23.80% |  |  |
Fair value of investments | $ 1,585 |  | $ 1,585 |  |  | 1,343
Gains (Losses) Recognized in Income | $ 557 | (288) | $ 42 | (456) |  |
Hertz |  |  |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |  |  |
Voting Interests | 0.00% |  | 0.00% |  | 38.90% |
Fair value of investments |  |  |  |  |  | 551
Gains (Losses) Recognized in Income | $ (302) | (27) | $ (637) | 68 |  |
Caesars |  |  |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |  |  |
Voting Interests | 16.70% |  | 16.70% |  |  |
Fair value of investments | $ 1,386 |  | $ 1,386 |  |  | $ 1,243
Gains (Losses) Recognized in Income | $ 613 | $ 249 | $ 18 | $ 275 |  |

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