Equity (Accumulated Other Comprehensive Loss) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Accumulated Other Comprehensive Income Loss Net Of Tax [Roll Forward]
Balance as of December 31, 2014	$ (514)
Other comprehensive income before reclassifications	(82)
Reclassifications from accumulated other comprehensive loss to net earnings	3
Net other comprehensive income	(79)
Balance as of March 31, 2015	(593)
Pension and other postretirement benefit plans, tax	(1)	(1)
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	(82)
Reclassifications from accumulated other comprehensive loss to net earnings	0
Net other comprehensive income	(82)
Balance as of March 31, 2015	(165)
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	0
Reclassifications from accumulated other comprehensive loss to net earnings	3
Net other comprehensive income	3
Balance as of March 31, 2015	(428)
Pension and other postretirement benefit plans, tax	2
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 March 31, 2015	$ 0