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Investments - Other Segments and Holding Company (Details) - USD ($) $ in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 2022 | Mar. 31, 2021 | Dec. 31, 2021
Schedule of Investments [Line Items] |  |  |
Investments | $ 7,397 |  | $ 9,151
Other Segments and Holding Company |  |  |
Schedule of Investments [Line Items] |  |  |
Investments | 121 |  | 199
Portion of unrealized (losses) gains that relates to equity securities still held | 58 | $ 58 |
Equity method investments | Other Segments and Holding Company |  |  |
Schedule of Investments [Line Items] |  |  |
Investments | 78 |  | 79
Other investments | Other Segments and Holding Company |  |  |
Schedule of Investments [Line Items] |  |  |
Investments | $ 43 |  | $ 120

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