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Investments (Narrative) (Details) number in Thousands, $ in Billions	Mar. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)
Investments [Abstract]
Equity Securities, FV-NI and without Readily Determinable Fair Value	$ 1.7	$ 2.0
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions	10
Total number of security positions	32
Equity Method Investments	$ 1.4	$ 1.4

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.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 6
-Subparagraph (b)(3)
-URI http://asc.fasb.org/extlink&oid=121645371&loc=d3e27290-111563

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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

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 323
-SubTopic 10
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=109237563&loc=d3e33749-111570

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 25
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-URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8813-108599

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-Name Accounting Standards Codification
-Topic 210
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-Section S99
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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.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 45
-Paragraph 1A
-URI http://asc.fasb.org/extlink&oid=99377092&loc=SL75136599-209740

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Balance held at close of period in number of contracts.

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-Name Accounting Standards Codification
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-SubTopic 320
-Section S99
-Paragraph 6
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-URI http://asc.fasb.org/extlink&oid=120401592&loc=d3e611322-123010

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