Equity (Accumulated Other Comprehensive Loss) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance as of December 31, 2016	$ 701
Other comprehensive income before reclassifications	36
Reclassifications from accumulated other comprehensive loss to net earnings	2
Net other comprehensive income	38
Balance as of March 31, 2017	844
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, 2016	(332)
Other comprehensive income before reclassifications	30
Reclassifications from accumulated other comprehensive loss to net earnings	0
Net other comprehensive income	30
Balance as of March 31, 2017	(302)
Pension and Postretirement Benefit Plans
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance as of December 31, 2016	(443)
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, 2017	(440)
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, 2016	2
Other comprehensive income before reclassifications	6
Reclassifications from accumulated other comprehensive loss to net earnings	(1)
Net other comprehensive income	5
Balance as of March 31, 2017	7
Accumulated Other Comprehensive Loss
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance as of December 31, 2016	(773)
Balance as of March 31, 2017	$ (735)