Emergence From The Chapter 11 Cases (Schedule Of Reorganization Items) (Details) - USD ($) $ in Millions	4 Months Ended	8 Months Ended	12 Months Ended
	Apr. 30, 2021	Dec. 31, 2021	Dec. 31, 2022	Dec. 31, 2020
Emergence From The Chapter 11 Cases [Abstract]
Write-off debt issuance costs and original issue net discount on debt subject to compromise				$ 93
Fresh start valuation adjustments	$ (1,038)
Debtor-in-possession financing costs	(15)			(121)
Secured Creditor Settlement				(58)
Professional fees and other bankruptcy related costs	50			137
Gain on vendor settlement of liabilities subject to compromise	(5,274)
Reorganization items, net	$ (4,171)			$ 409