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Fresh Start Accounting - Changes in Accounts Payable (Details) - USD ($) $ in Millions	Sep. 30, 2021	Feb. 09, 2021	Dec. 31, 2020
Reorganization, Chapter 11 [Line Items]
Net impact to accounts payable	$ 257	$ 415	$ 346
Reorganization Adjustments
Reorganization, Chapter 11 [Line Items]
Accrual of professional service provider success fees		38
Accrual of convenience claim distribution reserve		10
Accrual of professional service provider fees		5
Reinstatement of accounts payable from liabilities subject to compromise		2
Payment of professional fees		(31)
Net impact to accounts payable		$ 24

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Accrued Professional Service Provider Success Fees

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Carrying value as of the balance sheet date of liabilities incurred (and for which invoices have typically been received) and payable to vendors for goods and services received that are used in an entity's business. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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Carrying value as of the balance sheet date of obligations incurred through that date and payable for professional fees, such as for legal and accounting services received.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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