Fresh Start Accounting - Successor’s Equity (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Feb. 09, 2021	Dec. 31, 2020
Reorganization, Chapter 11 [Line Items]
Enterprise Value				$ 4,851
Plus: Cash and cash equivalents	$ 1,079	$ 130	$ 905	40
Less: Fair value of debt	(1,950)			(1,313)
Successor equity value	$ 10,729	$ 9,124	$ 5,671	3,586	$ (5,341)
Reorganization, Chapter 11, Fresh-Start Adjustment
Reorganization, Chapter 11 [Line Items]
Plus: Cash and cash equivalents				48
Less: Fair value of debt				(52)
Successor equity value				$ 210