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Investments (Tables) | 12 Months Ended
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Dec. 31, 2020
Schedule of Investments [Line Items] |
Investments Financial Information | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | Hertz | ​ | Herbalife
​ | Year Ended December 31, | ​ | Year Ended December 31,
​ | 2020 |  | 2019 |  | 2018 | ​ | 2020 |  | 2019 |  | 2018
​ | (in millions)
Net sales/Other revenue from operations | $ | 2,755 | ​ | $ | 9,779 |  | $ | 9,504 | ​ | $ | 2,609 | ​ | $ | 4,877 |  | $ | 4,892
Cost of goods sold/Other expenses from operations | ​ | 3,231 | ​ | ​ | 8,051 | ​ | ​ | 8,045 | ​ | ​ | 518 | ​ | ​ | 958 | ​ | ​ | 919
Net (loss) income | ​ | (1,209) | ​ | ​ | (50) | ​ | ​ | (227) | ​ | ​ | 161 | ​ | ​ | 311 | ​ | ​ | 297
Net (loss) income attributable to investee shareholders |  | (1,203) | ​ |  | (58) |  |  | (225) | ​ |  | 161 | ​ |  | 311 |  |  | 297
Summary of investments | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Voting | ​ | Fair Value of | ​ | Gains (Losses)
​ | ​ | Interests | ​ | Investment | ​ | Recognized in Income
​ | ​ | December 31, | ​ | December 31, | ​ | Year Ended December 31,
​ |  | 2020 | ​ | 2020 |  | 2019 | ​ | 2020 |  | 2019 |  | 2018
​ |  | ​ | ​ | (in millions)
Herbalife Nutrition Ltd. |  | 15.5% | ​ | $ | 985 | ​ | $ | 1,343 | ​ | $ | 161 | ​ | $ | (318) |  | $ | 864
Hertz Global Holdings, Inc. |  | — | ​ |  | — | ​ |  | 551 | ​ |  | (637) | ​ |  | 105 |  |  | (197)
Caesars Entertainment Corporation |  | — | ​ |  | — | ​ |  | 1,243 | ​ |  | 49 | ​ |  | 478 |  |  | —
​ | ​ | ​ | ​ | $ | 985 | ​ | $ | 3,137 | ​ | $ | (427) | ​ | $ | 265 |  | $ | 667
Summarized Financial Information of Equity Method Investments | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31, 2019
​ |  | Hertz |  | Herbalife
​ | ​ | (in millions)
Total assets | ​ | $ | 24,627 | ​ | $ | 2,679
Total liabilities | ​ |  | 22,739 | ​ |  | 3,069
Non-controlling interests | ​ | ​ | 119 | ​ | ​ | —
Equity attributable to investee shareholders | ​ |  | 1,769 | ​ |  | (390)
Investment Segment |
Schedule of Investments [Line Items] |
Investment | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31,
​ |  | 2020 |  | 2019
​ | ​ | (in millions)
Assets | ​ | ​ | ​ | ​ | ​ | ​
Investments: |  | ​ |  |  | ​ |
Equity securities: |  | ​ |  |  | ​ |
Basic materials | ​ | $ | — | ​ | $ | 281
Consumer, non-cyclical | ​ |  | 1,548 | ​ |  | 2,085
Consumer, cyclical | ​ |  | 2,073 | ​ |  | 2,427
Energy | ​ |  | 2,654 | ​ |  | 1,717
Utilities | ​ |  | 107 | ​ |  | —
Technology | ​ |  | 1,578 | ​ |  | 2,425
Industrial | ​ |  | 158 | ​ |  | 127
​ | ​ |  | 8,118 | ​ |  | 9,062
Corporate debt securities | ​ |  | 121 | ​ |  | 145
​ | ​ | $ | 8,239 | ​ | $ | 9,207
Liabilities | ​ |  |  | ​ |  |
Securities sold, not yet purchased, at fair value: | ​ |  |  | ​ |  |
Equity securities: | ​ |  |  | ​ |  |
Basic materials | ​ | $ | — | ​ | $ | 209
Consumer, non-cyclical | ​ | ​ | 424 | ​ | ​ | 29
Consumer, cyclical | ​ |  | 572 | ​ |  | 379
Energy | ​ |  | 1,476 | ​ |  | 124
Utilities | ​ |  | 49 | ​ |  | —
Financial | ​ |  | — | ​ |  | 152
Technology | ​ |  | — | ​ |  | 217
Communication | ​ |  | — | ​ |  | 80
​ | ​ | $ | 2,521 | ​ | $ | 1,190
Other Segments and Holding Company |
Schedule of Investments [Line Items] |
Investment | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31,
​ |  | 2020 |  | 2019
​ | ​ | (in millions)
Equity method investments | ​ | $ | 120 | ​ | $ | 201
Held to maturity debt investments measured at amortized cost | ​ | ​ | 20 | ​ | ​ | —
Other investments measured at fair value | ​ |  | 534 | ​ |  | 537
​ | ​ | $ | 674 | ​ | $ | 738

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