Equity - Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance at beginning of period	$ 536	$ 684
Balance at end of period	(194)	388
Pension and other postretirement benefit plans, tax (less than)	1	28
Accumulated Other Comprehensive Loss
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance at beginning of period	(624)	(742)
Other comprehensive (loss) income before reclassifications	(39)
Reclassifications from accumulated other comprehensive income (loss) to net earnings	3
Net other comprehensive (loss) income	(36)
Balance at end of period	(660)	$ (633)
Foreign Currency Translation Adjustments
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance at beginning of period	(321)
Other comprehensive (loss) income before reclassifications	(31)
Reclassifications from accumulated other comprehensive income (loss) to net earnings	0
Net other comprehensive (loss) income	(31)
Balance at end of period	(352)
Pension and Postretirement Benefit Plans
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance at beginning of period	(305)
Other comprehensive (loss) income before reclassifications	0
Reclassifications from accumulated other comprehensive income (loss) to net earnings	2
Net other comprehensive (loss) income	2
Balance at end of period	(303)
Pension and other postretirement benefit plans, tax (less than)	1
Unrealized Gain (Loss) on Foreign Forward Exchange Contracts
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance at beginning of period	2
Other comprehensive (loss) income before reclassifications	(8)
Reclassifications from accumulated other comprehensive income (loss) to net earnings	1
Net other comprehensive (loss) income	(7)
Balance at end of period	$ (5)