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Summary of Significant Accounting Policies - Redeemable Noncontrolling Interest (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Noncontrolling Interest [Line Items]
Balance as of beginning of period	$ 78
Distributions to noncontrolling interest	(19)
Contributions from redeemable noncontrolling interest	12
Comprehensive income (loss) attributable to noncontrolling interest	(38)	$ (39)
Balance as of end of period	80
Redeemable noncontrolling interest
Noncontrolling Interest [Line Items]
Distributions to noncontrolling interest	(1)
Non-cash adjustments to noncontrolling interest	7
Comprehensive income (loss) attributable to noncontrolling interest	$ (16)

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Noncontrolling Interest, Noncash Adjustments

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Amount after tax of increase (decrease) in equity from transactions and other events and circumstances from net income (loss) and other comprehensive income (loss), attributable to noncontrolling interests. Excludes changes in equity resulting from investments by owners and distributions to owners.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 810
-SubTopic 10
-Section 45
-Paragraph 21
-URI http://asc.fasb.org/extlink&oid=96868048&loc=SL4613674-111683

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 810
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-Section 55
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Decrease in noncontrolling interest balance from payment of dividends or other distributions by the non-wholly owned subsidiary or partially owned entity, included in the consolidation of the parent entity, to the noncontrolling interest holders.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.3-04)
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Amount of noncontrolling interests which are redeemable by the parent entity, classified as other equity.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 480
-SubTopic 10
-Section S99
-Paragraph 3A
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-URI http://asc.fasb.org/extlink&oid=65877616&loc=SL6540498-122764

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