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Investments - Other Segments and Holding Company (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Schedule of Investments [Line Items] |  |  |
Investments | $ 9,151 | $ 8,913 |
Other Segments and Holding Company |  |  |
Schedule of Investments [Line Items] |  |  |
Investments | 199 | 674 |
Portion of unrealized (losses) gains that relates to equity securities still held | 61 | 36 | $ 421
Equity method investments | Other Segments and Holding Company |  |  |
Schedule of Investments [Line Items] |  |  |
Investments | 79 | 120 |
Held-to-maturity Securities [Member] | Other Segments and Holding Company |  |  |
Schedule of Investments [Line Items] |  |  |
Investments |  | 20 |
Other investments | Other Segments and Holding Company |  |  |
Schedule of Investments [Line Items] |  |  |
Investments | $ 120 | $ 534 |

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