Emergence From The Chapter 11 Cases (Schedule Of Reorganization Items) (Details) - Predecessor [Member] - USD ($) $ in Millions	3 Months Ended	4 Months Ended	9 Months Ended
	Sep. 30, 2020	Apr. 30, 2021	Sep. 30, 2020
Gain on settlement of liabilities subject to compromise		$ 5,274
Fresh start valuation adjustments		(1,038)
Write-off of debt issuance costs and original issue net discount on debt subject to compromise			$ (85)
Debtor-in-possession financing costs		(15)	(19)
Professional fees and other bankruptcy related costs		(50)	(169)
Reorganization items, net	$ (131)	$ 4,171	$ (273)