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Fresh Start Accounting - Successor’s Equity (Details) - USD ($) $ in Millions	Sep. 30, 2021	Feb. 09, 2021	Dec. 31, 2020	Sep. 30, 2020
Reorganization, Chapter 11 [Line Items]
Enterprise Value		$ 4,851
Plus: Cash and cash equivalents	$ 849	40	$ 279	$ 306
Less: Fair value of debt		(1,313)
Successor equity value	3,038	3,586	$ (5,341)
Restricted cash		86
Fresh Start Adjustments
Reorganization, Chapter 11 [Line Items]
Plus: Cash and cash equivalents		48
Less: Fair value of debt	$ 52	(52)
Successor equity value		210
Restricted cash		$ 8

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