Equity - Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning Balance	$ 1,331	$ 268	$ 571	$ 536
Other comprehensive (loss) income before reclassifications			(109)
Reclassifications from accumulated other comprehensive income (loss) to net earnings			(4)
Net other comprehensive (loss) income			(113)
Ending Balance	1,915	498	1,915	498
Pension and other postretirement benefit plans, tax	(1)	(1)	(5)	8
Accumulated Other Comprehensive Loss
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning Balance	(764)	(704)	(637)	(624)
Ending Balance	(750)	$ (677)	(750)	$ (677)
Foreign Currency Translation Adjustments
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning Balance			(323)
Other comprehensive (loss) income before reclassifications			2
Reclassifications from accumulated other comprehensive income (loss) to net earnings			0
Net other comprehensive (loss) income			2
Ending Balance	(321)		(321)
Pension and Postretirement Benefit Plans
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning Balance			(328)
Other comprehensive (loss) income before reclassifications			9
Reclassifications from accumulated other comprehensive income (loss) to net earnings			11
Net other comprehensive (loss) income			20
Ending Balance	(308)		(308)
Pension and other postretirement benefit plans, tax			3
Unrealized Gain (Loss) on Cash Flow Hedges
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning Balance			14
Other comprehensive (loss) income before reclassifications			(120)
Reclassifications from accumulated other comprehensive income (loss) to net earnings			(15)
Net other comprehensive (loss) income			(135)
Ending Balance	$ (121)		$ (121)