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Investments (Narrative) (Details) $ in Millions | Dec. 31, 2020 USD ($) positions | Dec. 31, 2019 USD ($)
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Investment [Line Items] |  |
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions | positions | 2,000 |
Total number of security positions | 36,000 |
Equity Securities, FV-NI and without Readily Determinable Fair Value | $ 2,300 | $ 2,000
Equity Method Investments | $ 1,300 | $ 1,400

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