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Investments - Other Segments and Holding Company (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019 | Dec. 31, 2019
Schedule of Investments [Line Items] |  |  |  |  |
Investments | $ 9,498 |  | $ 9,498 |  | $ 9,945
Other Segments and Holding Company |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |
Unrealized gains (losses) that relate to equity securities still held | 146 | $ (326) | (166) | $ (480) |
Investments | 817 |  | 817 |  | 738
Other Segments and Holding Company | Equity method investments |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |
Investments | 193 |  | 193 |  | 201
Other Segments and Holding Company | Other investments (measured at fair value) |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |
Investments | $ 624 |  | $ 624 |  | $ 537

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