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Investments and Related Matters Investment Segment (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018 | Dec. 31, 2018
Schedule of Investments [Line Items] |  |  |  |  |
Investments | $ 8,858 |  | $ 8,858 |  | $ 8,337
Securities sold, not yet purchased, at fair value | 146 |  | 146 |  | 468
Investment Segment |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |
Investments | 8,191 |  | 8,191 |  | 6,867
Securities sold, not yet purchased, at fair value | 146 |  | 146 |  | 468
Unrealized gain on debt and equity securities still held | (118) | $ 345 | 434 | $ 397 |
Investment Segment | Equity securities: |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |
Investments | 8,000 |  | 8,000 |  | 6,686
Securities sold, not yet purchased, at fair value | 146 |  | 146 |  | 468
Investment Segment | Corporate debt securities |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |
Investments | 191 |  | 191 |  | 181
Investment Segment | Basic materials | Equity securities: |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |
Investments | 410 |  | 410 |  | 414
Investment Segment | Consumer, non-cyclical | Equity securities: |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |
Investments | 1,752 |  | 1,752 |  | 2,161
Securities sold, not yet purchased, at fair value | 42 |  | 42 |  | 57
Investment Segment | Consumer, cyclical | Equity securities: |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |
Investments | 1,907 |  | 1,907 |  | 1,161
Securities sold, not yet purchased, at fair value | 86 |  | 86 |  | 106
Investment Segment | Consumer, cyclical | Corporate debt securities |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |
Securities sold, not yet purchased, at fair value | 0 |  | 0 |  | 0
Investment Segment | Energy | Equity securities: |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |
Investments | 2,546 |  | 2,546 |  | 1,598
Securities sold, not yet purchased, at fair value | 18 |  | 18 |  | 305
Investment Segment | Financial | Equity securities: |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |
Investments | 241 |  | 241 |  | 167
Investment Segment | Technology | Equity securities: |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |
Investments | 989 |  | 989 |  | 1,040
Investment Segment | Other | Equity securities: |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |
Investments | $ 155 |  | $ 155 |  | 145
Hertz | Investment Segment |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |
Ownership percentage in investment measured at fair value that would otherwise be accounted for under equity method | 23.10% |  | 23.10% |  |
Unrealized gain (loss) on equity method investments under fair value option | $ (27) | (106) | $ 68 | (158) |
Fair value of equity method investment under fair value option | $ 310 |  | $ 310 |  | 320
Herbalife | Investment Segment |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |
Ownership percentage in investment measured at fair value that would otherwise be accounted for under equity method | 18.60% |  | 18.60% |  |
Unrealized gain (loss) on equity method investments under fair value option | $ (288) | $ 173 | $ (456) | $ 717 |
Fair value of equity method investment under fair value option | $ 1,200 |  | $ 1,200 |  | $ 1,700
Caesars [Member] | Investment Segment |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |
Ownership percentage in investment measured at fair value that would otherwise be accounted for under equity method | 11.80% |  | 11.80% |  |
Unrealized gain (loss) on equity method investments under fair value option | $ 249 |  | $ 275 |  |
Fair value of equity method investment under fair value option | $ 939 |  | $ 939 |  |

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