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Investments in Unconsolidated Entities - Additional Information (Details) - USD ($)	12 Months Ended
	Dec. 31, 2018	Jan. 01, 2018	Dec. 31, 2017
Equity Securities without Readily Determinable Fair Value [Line Items]
Cumulative effect of accounting changes			$ 195,000,000
Measurement alternative, impairment	$ 0
Retained earnings
Equity Securities without Readily Determinable Fair Value [Line Items]
Cumulative effect of accounting changes			$ 165,000,000
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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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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