Accounts Receivable (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Provision for uncollectible amounts	$ 7
Successor [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Provision for uncollectible amounts	$ 7
Predecessor [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Provision for uncollectible amounts		$ 10