Supplementary Information Schedule of Cash Paid for Interest and Taxes (Details) - USD ($) $ in Millions	9 Months Ended	12 Months Ended
	Sep. 30, 2016	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Interest paid, net of capitalized interest		$ 467	$ 477	$ 511
Income taxes paid, net of refunds		161	331	386
Currency Devaluation and Related Charges		41	85	245
Proceeds from Sale of Property, Plant, and Equipment		49	37	59
Capital Lease Obligations Incurred	$ 25
Angola, Kwanza
Currency Devaluation and Related Charges		$ 31	39
Venezuelan Bolivar
Currency Devaluation and Related Charges			26	245
Asset, Reporting Currency Denominated, Value				$ 92
Angola, Kwanza | Angola, Kwanza
Asset, Reporting Currency Denominated, Value			$ 43