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Investment in Unconsolidated Entities - Additional Information (Details) - USD ($)	3 Months Ended	9 Months Ended
	Sep. 30, 2018	Sep. 30, 2018	Jan. 01, 2018	Dec. 31, 2017
Equity Securities without Readily Determinable Fair Value [Line Items]
Cumulative effect of accounting changes				$ 193,000,000
Measurement alternative, impairment	$ 0	$ 0
Measurement alternative, observable price change	$ 0	$ 0
Retained earnings
Equity Securities without Readily Determinable Fair Value [Line Items]
Cumulative effect of accounting changes				$ 163,000,000
ASU 2016-01 | Retained earnings
Equity Securities without Readily Determinable Fair Value [Line Items]
Cumulative effect of accounting changes			$ 1,000,000

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- Definition

Amount of impairment loss 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

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- Definition

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+ References

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-Name Accounting Standards Codification
-Topic 321
-SubTopic 10
-Section 50
-Paragraph 3
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-URI http://asc.fasb.org/extlink&oid=84241550&loc=SL75117539-209714

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