Valuation And Qualifying Accounts (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Valuation and allowance roll forward
Beginning balance, January 1	$ 69	$ 78
Ending balance, December 31	48	69	$ 78
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	0	$ 3
Allowance for doubtful receivables
Valuation and allowance roll forward
Beginning balance, January 1	16	22	8
Additions charged to costs and expenses	15	14	19
Deductions	(14)	(20)	(8)
Ending balance, December 31	17	16	22
Deferred tax valuation allowance
Valuation and allowance roll forward
Beginning balance, January 1	53	56	41
Additions charged to costs and expenses	0	0	15
Deductions	(22)	(3)	0
Ending balance, December 31	$ 31	$ 53	$ 56