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Investments - Other Segments and Holding Company (Details) - USD ($) $ in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 2021 | Mar. 31, 2020 | Dec. 31, 2020
Schedule of Investments [Line Items] |  |  |
Investments | $ 11,480 |  | $ 8,913
Other Segments and Holding Company |  |  |
Schedule of Investments [Line Items] |  |  |
Investments | 554 |  | 674
Unrealized gains (losses) that relate to equity securities still held | 58 | $ (312) |
Other Segments and Holding Company | Equity method investments |  |  |
Schedule of Investments [Line Items] |  |  |
Investments | 108 |  | 120
Other Segments and Holding Company | Held to maturity debt investments measured at amortized cost |  |  |
Schedule of Investments [Line Items] |  |  |
Investments | 20 |  | 20
Other Segments and Holding Company | Other investments measured at fair value |  |  |
Schedule of Investments [Line Items] |  |  |
Investments | $ 426 |  | $ 534

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