Fresh Start Accounting (Fresh Start - Cumulative Impact Of Reorganization) (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022	Apr. 30, 2021
Net impact on accumulated deficit	$ 884	$ 855
Reorganization Adjustments [Member]
Gain on settlement of Liabilities Subject to Compromise			$ 5,274
Cancellation of Predecessor equity			4,754
Net impact on accumulated deficit			$ 10,028