Equity (Accumulated Other Comprehensive Loss) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance as of December 31, 2015			$ (600)
Other comprehensive income before reclassifications			(39)
Reclassifications from accumulated other comprehensive loss to net earnings			4
Net other comprehensive income			(35)
Balance as of September 30, 2016	$ (635)		(635)
Pension and other postretirement benefit plans, tax	1	$ 1	5	$ 19
Foreign Currency Translation Adjustment
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance as of December 31, 2015			(193)
Other comprehensive income before reclassifications			(52)
Reclassifications from accumulated other comprehensive loss to net earnings			0
Net other comprehensive income			(52)
Balance as of September 30, 2016	(245)		(245)
Pension and Postretirement Benefit Plans
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance as of December 31, 2015			(406)
Other comprehensive income before reclassifications			7
Reclassifications from accumulated other comprehensive loss to net earnings			7
Net other comprehensive income			14
Balance as of September 30, 2016	(392)		(392)
Pension and other postretirement benefit plans, tax			4
Unrealized Gain (Loss) on Forward Exchange Contracts
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance as of December 31, 2015			(1)
Other comprehensive income before reclassifications			6
Reclassifications from accumulated other comprehensive loss to net earnings			(3)
Net other comprehensive income			3
Balance as of September 30, 2016	$ 2		$ 2