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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
-Topic 715
-SubTopic 30
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Long-term Employee Benefits (Narrative) (Details) - USD ($) $ in Millions	1 Months Ended	3 Months Ended	9 Months Ended
	Oct. 31, 2017	Sep. 30, 2017	Sep. 30, 2017
Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Contributions by employer		$ 4	$ 14
Estimated future employer contributions in current fiscal year		$ 11	11
U.S. Pension Restoration Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Contributions by employer			$ 10
Subsequent Event [Member] \| U.S. Pension Restoration Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Cash payment to settle remaining liability	$ 10