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Investments (Narrative) (Details) $ in Millions | Jun. 30, 2021 USD ($) | Dec. 31, 2020 USD ($)
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Investments [Abstract] |  |
Equity Securities, FV-NI | $ 2,800 | $ 2,300
Equity Method Investments | $ 1,300 | $ 1,300
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions | 6,500 |
Total number of security positions | 38,000 |

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