Equity (Accumulated Other Comprehensive Loss) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance as of December 31, 2015	$ (600)
Other comprehensive income before reclassifications	18
Reclassifications from accumulated other comprehensive loss to net earnings	2
Net other comprehensive income	20
Balance as of March 31, 2016	(580)
Pension and other postretirement benefit plans, tax	1	$ 1
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	14
Reclassifications from accumulated other comprehensive loss to net earnings	0
Net other comprehensive income	14
Balance as of March 31, 2016	(179)
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	0
Reclassifications from accumulated other comprehensive loss to net earnings	3
Net other comprehensive income	3
Balance as of March 31, 2016	(403)
Pension and other postretirement benefit plans, tax	1
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	4
Reclassifications from accumulated other comprehensive loss to net earnings	(1)
Net other comprehensive income	3
Balance as of March 31, 2016	$ 2