Commitments And Contingencies - Schedule of Changes in Contract Obligations (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Loss Contingency Accrual [Roll Forward]
Beginning contractual obligations	$ 360	$ 468
Additions (a)	1	0
Liabilities settled	(166)	(200)
Accretion of discount	8	13
Changes in estimate (b)	(4)	79
Ending contractual obligations	$ 199	$ 360