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Fresh Start Accounting - Enterprise Value Reconciliation (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
Plus: Current liabilities	2,510	1,582	3,094
Plus: Asset retirement obligations (non-current portion)		236
Plus: Other non-current liabilities		7
Assets	$ 7,326	6,814	$ 6,584
Restricted cash		86
Fresh Start Adjustments
Reorganization, Chapter 11 [Line Items]
Plus: Cash and cash equivalents		48
Plus: Current liabilities		0
Plus: Asset retirement obligations (non-current portion)		97
Plus: Other non-current liabilities		97
Assets		359
Restricted cash		$ 8

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