Consolidated Statement of Equity (Unaudited) (Parenthetical) $ in Millions	9 Months Ended
Sep. 30, 2018 USD ($)
Statement of Stockholders' Equity [Abstract]
Net income attributable to noncontrolling interest	$ 112

Amount of Net Income (Loss) attributable to redeemable noncontrolling interest.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.19)
-URI http://asc.fasb.org/extlink&oid=115205541&loc=SL114868664-224227

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration