Valuation And Qualifying Accounts (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Valuation and allowance roll forward
Beginning balance, January 1	$ 78	$ 49
Ending balance, December 31	69	78	$ 49
Accounting Standards Update 2016-13
Valuation and allowance roll forward
Cumulative effect of change in accounting for credit loss as of January 1, 2020, pretax		0	3	$ 0
Allowance for doubtful receivables
Valuation and allowance roll forward
Beginning balance, January 1	22	8	6
Additions charged to costs and expenses	14	19	8
Deductions	(20)	(8)	(6)
Ending balance, December 31	16	22	8
Deferred tax valuation allowance
Valuation and allowance roll forward
Beginning balance, January 1	56	41	0
Additions charged to costs and expenses	0	15	55
Deductions	(3)	0	(14)
Ending balance, December 31	$ 53	$ 56	$ 41