Equity - Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance as of December 31, 2016			$ 701
Balance as of June 30, 2017	$ 1,073		1,073
Pension and other postretirement benefit plans, tax	(2)	$ 3	(1)	$ 4
Foreign Currency Translation Adjustment
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance as of December 31, 2016			(332)
Other comprehensive income before reclassifications			72
Reclassifications from accumulated other comprehensive loss to net earnings			0
Net other comprehensive income			72
Balance as of June 30, 2017	(260)		(260)
Pension and Postretirement Benefit Plans
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance as of December 31, 2016			(443)
Other comprehensive income before reclassifications			(1)
Reclassifications from accumulated other comprehensive loss to net earnings			6
Net other comprehensive income			5
Balance as of June 30, 2017	(438)		(438)
Pension and other postretirement benefit plans, tax			2
Unrealized Gain (Loss) on Forward Exchange Contracts
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance as of December 31, 2016			2
Other comprehensive income before reclassifications			1
Reclassifications from accumulated other comprehensive loss to net earnings			(4)
Net other comprehensive income			(3)
Balance as of June 30, 2017	(1)		(1)
Accumulated Other Comprehensive Loss
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance as of December 31, 2016			(773)
Other comprehensive income before reclassifications			72
Reclassifications from accumulated other comprehensive loss to net earnings			2
Net other comprehensive income			74
Balance as of June 30, 2017	$ (699)		$ (699)