Equity Accumulated Other Comprehensive Loss (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent			$ 123,000,000
Unfunded pension obligation, Net of Tax	$ (285,000,000)		(285,000,000)		$ (286,000,000)
Foreign currency translation adjustment, Net of Tax	(2,030,000,000)		(2,030,000,000)		(2,147,000,000)
Accumulated Other Comprehensive Income (Loss), Net of Tax	(2,666,000,000)		(2,666,000,000)		(2,756,000,000)
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax			(19,000,000)
Accumulated Other Comprehensive Income (Loss), Cumulative Changes in Net Gain (Loss) from Cash Flow Hedges, Effect Net of Tax	(351,000,000)		(351,000,000)		$ (323,000,000)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax			142,000,000
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax	80,000,000	$ (16,000,000)	127,000,000	$ 232,000,000
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Net of Tax	5,000,000	19,000,000	(42,000,000)	(138,000,000)
Total pension adjustments, net of income tax	7,000,000	$ 3,000,000	20,000,000	$ 10,000,000
AOCI Attributable to Parent [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax			117,000,000
Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax			(35,000,000)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax			40,000,000
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Net of Tax			5,000,000
Accumulated Defined Benefit Plans Adjustment [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax			(3,000,000)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax			4,000,000
Total pension adjustments, net of income tax			1,000,000
Accumulated Translation Adjustment [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax			19,000,000
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax			98,000,000
Alto Maipo [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Unfunded pension obligation, Net of Tax	0		0
Foreign currency translation adjustment, Net of Tax	0		0
Accumulated Other Comprehensive Income (Loss), Net of Tax	(33,000,000)		(33,000,000)
Accumulated Other Comprehensive Income (Loss), Cumulative Changes in Net Gain (Loss) from Cash Flow Hedges, Effect Net of Tax	$ (33,000,000)		$ (33,000,000)