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Investments Other Segments and Holding Company (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Schedule of Investments [Line Items] |  |  |
Investments | $ 8,913 | $ 9,945 |
Other Segments and Holding Company |  |  |
Schedule of Investments [Line Items] |  |  |
Investments | 674 | 738 |
Portion of unrealized (losses) gains that relates to equity securities still held | 36 | 421 | $ 339
Equity method investments | Other Segments and Holding Company |  |  |
Schedule of Investments [Line Items] |  |  |
Investments | 120 | 201 |
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 | $ 534 | $ 537 |

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