Valuation And Qualifying Accounts (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Valuation and allowance roll forward
Beginning balance, January 1	$ 48	$ 69
Ending balance, December 31	36	48	$ 69
Allowance for doubtful receivables
Valuation and allowance roll forward
Beginning balance, January 1	17	16	22
Additions charged to costs and expenses	33	15	14
Deductions	(14)	(14)	(20)
Ending balance, December 31	36	17	16
Deferred tax valuation allowance
Valuation and allowance roll forward
Beginning balance, January 1	31	53	56
Additions charged to costs and expenses	0	0	0
Deductions	(31)	(22)	(3)
Ending balance, December 31	$ 0	$ 31	$ 53