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Investments (Narrative) (Details) $ in Millions	Dec. 31, 2020 USD ($) positions	Dec. 31, 2019 USD ($)
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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Number of investment positions in available-for-sale investments in a continuous unrealized loss position for which an other-than-temporary impairment (OTTI) has not been recognized in the income statement.

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Amount of investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI) and investment in equity security without readily determinable fair value.

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Balance held at close of period in number of contracts.

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