Accounts Receivable (Activity In The Allowance For Credit Losses) (Details) - USD ($) $ in Millions	4 Months Ended	8 Months Ended	12 Months Ended
	Apr. 30, 2021	Dec. 31, 2021	Dec. 31, 2023	Dec. 31, 2022
Accounts Receivable [Abstract]
Allowance for credit losses, Beginning Balance	$ 130		$ 47	$ 57
Increases: Provision for bad debt charged to expense		14	35	26
Increases: Provision for bad debt charged to revenue	37	38	23	30
Write-offs charged against allowance, net of recoveries	(167)	5	(52)	(66)
Allowance for credit losses, Ending Balance		$ 57	$ 53	$ 47