Equity (Accumulated Other Comprehensive Loss) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Accumulated Other Comprehensive Income Loss Net Of Tax [Roll Forward]
Balance as of December 31, 2014	$ (553)		$ (514)
Other comprehensive income before reclassifications			(48)
Reclassifications from accumulated other comprehensive loss to net earnings			9
Net other comprehensive income			(39)
Balance as of September 30, 2015	(553)		(553)
Pension and other postretirement benefit plans, tax	(1)	$ 0	(19)	$ 21
Foreign Currency Translation Adjustment
Accumulated Other Comprehensive Income Loss Net Of Tax [Roll Forward]
Balance as of December 31, 2014			(83)
Other comprehensive income before reclassifications			(78)
Reclassifications from accumulated other comprehensive loss to net earnings			0
Net other comprehensive income			(78)
Balance as of September 30, 2015	(161)		(161)
Pension and Postretirement Benefit Plans
Accumulated Other Comprehensive Income Loss Net Of Tax [Roll Forward]
Balance as of December 31, 2014			(431)
Other comprehensive income before reclassifications			31
Reclassifications from accumulated other comprehensive loss to net earnings			9
Net other comprehensive income			40
Balance as of September 30, 2015	(391)		(391)
Pension and other postretirement benefit plans, tax			5
Unrealized Gain (Loss) on Forward Exchange Contracts
Accumulated Other Comprehensive Income Loss Net Of Tax [Roll Forward]
Balance as of December 31, 2014			0
Other comprehensive income before reclassifications			(1)
Reclassifications from accumulated other comprehensive loss to net earnings			0
Net other comprehensive income			(1)
Balance as of September 30, 2015	$ (1)		$ (1)