Equity - Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning Balance	$ 571	$ 536
Other comprehensive (loss) income before reclassifications	(10)
Reclassifications from accumulated other comprehensive income (loss) to net earnings	(1)
Net other comprehensive (loss) income	(11)
Ending Balance	1,098	(194)
Pension and other postretirement benefit plans, tax (less than)	(4)	(1)
Accumulated Other Comprehensive Loss
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning Balance	(637)	(624)
Ending Balance	(648)	$ (660)
Foreign Currency Translation Adjustments
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning Balance	(323)
Other comprehensive (loss) income before reclassifications	(30)
Reclassifications from accumulated other comprehensive income (loss) to net earnings	0
Net other comprehensive (loss) income	(30)
Ending Balance	(353)
Pension and Postretirement Benefit Plans
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning Balance	(328)
Other comprehensive (loss) income before reclassifications	13
Reclassifications from accumulated other comprehensive income (loss) to net earnings	4
Net other comprehensive (loss) income	17
Ending Balance	(311)
Pension and other postretirement benefit plans, tax (less than)	1
Unrealized Gain (Loss) on Cash Flow hedges
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning Balance	14
Other comprehensive (loss) income before reclassifications	7
Reclassifications from accumulated other comprehensive income (loss) to net earnings	(5)
Net other comprehensive (loss) income	2
Ending Balance	$ 16