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Investments Other Segments and Holding Company (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018 | Dec. 31, 2018
Schedule of Investments [Line Items] |  |  |  |  |
Investments | $ 9,437 |  | $ 9,437 |  | $ 8,337
Other Segments and Holding Company |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |
Unrealized gains (losses) that relate to equity securities still held | 42 | $ 36 | (438) | $ 91 |
Investments | 719 |  | 719 |  | 1,470
Other Segments and Holding Company | Equity method investments |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |
Investments | 199 |  | 199 |  | 143
Other Segments and Holding Company | Other investments (measured at fair value) |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |
Investments | $ 520 |  | $ 520 |  | $ 1,327

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