v3.10.0.1

Investments - Carrying Value of Equity Investments Without Readily Determinable Fair Values (Details) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 USD ($) | Sep. 30, 2018 USD ($)
Equity Securities without Readily Determinable Fair Value [Roll Forward] |  |
Carrying value, beginning of period | $ 859 | $ 872
Additions | 0 | 23
Sales | (718) | (718)
Downward adjustments for observable price changes and impairment | 0 | (20)
Foreign currency translation and other | (3) | (19)
Carrying value, end of period | 138 | 138
Cumulative downward adjustments for price changes and impairment | $ 81 | $ 81

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- Definition Amount of investment in equity security without readily determinable fair value. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 321 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=84241550&loc=SL75117539-209714 + Details
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- Definition Amount of loss from downward price adjustment on investment in equity security without readily determinable fair value. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 321 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=84241550&loc=SL75117539-209714 + Details
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