Equity - Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance at beginning of period			$ 701
Other comprehensive income before reclassifications			93
Reclassifications from accumulated other comprehensive loss to net earnings			2
Net other comprehensive income			95
Balance at end of period	$ 893		893
Pension and other postretirement benefit plans, tax	1	$ 1	0	$ 5
Accumulated Other Comprehensive Loss
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance at beginning of period			(773)
Balance at end of period	(678)		(678)
Foreign Currency Translation Adjustment
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance at beginning of period			(332)
Other comprehensive income before reclassifications			96
Reclassifications from accumulated other comprehensive loss to net earnings			0
Net other comprehensive income			96
Balance at end of period	(236)		(236)
Pension and Postretirement Benefit Plans
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance at beginning of period			(443)
Other comprehensive income before reclassifications			(1)
Reclassifications from accumulated other comprehensive loss to net earnings			8
Net other comprehensive income			7
Balance at end of period	(436)		(436)
Pension and other postretirement benefit plans, tax			3
Unrealized Gain (Loss) on Forward Exchange Contracts
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance at beginning of period			2
Other comprehensive income before reclassifications			8
Reclassifications from accumulated other comprehensive loss to net earnings			(6)
Net other comprehensive income			2
Balance at end of period	4		4
Unrealized Loss on Investment
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance at beginning of period			0
Other comprehensive income before reclassifications			(10)
Reclassifications from accumulated other comprehensive loss to net earnings			0
Net other comprehensive income			(10)
Balance at end of period	$ (10)		$ (10)