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Investments (Narrative) (Details) number in Thousands, $ in Millions	Mar. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)
Investments [Abstract]
Equity Securities, FV-NI	$ 2,600	$ 2,300
Equity Method Investments	$ 1,300	$ 1,300
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions	8
Total number of security positions	37

X

- Definition

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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- Definition

This item represents the carrying amount on the entity's balance sheet of its investment in common stock of an equity method investee. This is not an indicator of the fair value of the investment, rather it is the initial cost adjusted for the entity's share of earnings and losses of the investee, adjusted for any distributions (dividends) and other than temporary impairment (OTTI) losses recognized.

+ References

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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), classified as current.

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Balance held at close of period in number of contracts.

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