Equity (Accumulated Other Comprehensive Loss) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Accumulated Other Comprehensive Income Loss Net Of Tax [Roll Forward]
Balance as of December 31, 2014			$ (514)
Other comprehensive income before reclassifications			(3)
Reclassifications from accumulated other comprehensive loss to net earnings			6
Net other comprehensive income			3
Balance as of June 30, 2015	$ (511)		(511)
Pension and other postretirement benefit plans, tax	(16)	$ 22	(18)	$ 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			(34)
Reclassifications from accumulated other comprehensive loss to net earnings			0
Net other comprehensive income			(34)
Balance as of June 30, 2015	(117)		(117)
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			6
Net other comprehensive income			37
Balance as of June 30, 2015	(394)		(394)
Pension and other postretirement benefit plans, tax			4
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			0
Reclassifications from accumulated other comprehensive loss to net earnings			0
Net other comprehensive income			0
Balance as of June 30, 2015	$ 0		$ 0