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Fresh Start Accounting - Additional Information (Details) - USD ($) $ in Millions	Sep. 30, 2021	Feb. 09, 2021	Dec. 31, 2020
Reorganization, Chapter 11 [Line Items]
Assets	$ 7,326	$ 6,814	$ 6,584
Liabilities	4,288	3,228	11,925
Liabilities and Equity	7,326	6,814	$ 6,584
Enterprise value		4,851
Predecessor
Reorganization, Chapter 11 [Line Items]
Assets		6,595
Liabilities		13,175
Liabilities and Equity		6,595
Fresh Start Adjustments
Reorganization, Chapter 11 [Line Items]
Assets		359
Liabilities		149
Liabilities and Equity	$ 201	359
Minimum | Fresh Start Adjustments
Reorganization, Chapter 11 [Line Items]
Assets		3,500
Liabilities and Equity		$ 3,500
Maximum
Reorganization, Chapter 11 [Line Items]
Percent of voting shares received by holders		50.00%
Maximum | Fresh Start Adjustments
Reorganization, Chapter 11 [Line Items]
Assets		$ 4,900
Liabilities and Equity		$ 4,900

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