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Subsequent Events (Details)		2 Months Ended	12 Months Ended
	Feb. 03, 2021 USD ($) employee	Mar. 01, 2021 USD ($) employee	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Feb. 09, 2021 USD ($)	Feb. 02, 2021 USD ($)	Jun. 28, 2020 USD ($)
Subsequent Event [Line Items]
Debt, principal			$ 9,095,000,000	$ 8,916,000,000
Separation and other termination costs			$ 44,000,000	$ 12,000,000	$ 38,000,000
Credit facility | Exit credit facility
Subsequent Event [Line Items]
Revolving credit, maximum borrowing capacity								$ 2,500,000,000
Credit facility | Tranche B Loans
Subsequent Event [Line Items]
Revolving credit, maximum borrowing capacity								$ 220,000,000
Subsequent event
Subsequent Event [Line Items]
Number of employees terminated | employee	220	220
Number of employees terminated, percent	15.00%	15.00%
Separation and other termination costs	$ 20,000,000	$ 20,000,000
Subsequent event | Minimum
Subsequent Event [Line Items]
Fresh-start adjustment, increase (decrease), assets						$ 3,500,000,000
Fresh-start adjustment, increase (decrease), liabilities and stockholders' equity						3,500,000,000
Subsequent event | Maximum
Subsequent Event [Line Items]
Fresh-start adjustment, increase (decrease), assets						4,700,000,000
Fresh-start adjustment, increase (decrease), liabilities and stockholders' equity						$ 4,700,000,000
Subsequent event | Senior notes | 5.5% Senior Notes due 2026
Subsequent Event [Line Items]
Debt, principal							$ 500,000,000
Subsequent event | Senior notes | 5.875% Senior Notes due 2029
Subsequent Event [Line Items]
Debt, principal							500,000,000
Subsequent event | Credit facility | Exit credit facility
Subsequent Event [Line Items]
Revolving credit, maximum borrowing capacity							2,500,000,000
Subsequent event | Credit facility | Revolving Tranche A
Subsequent Event [Line Items]
Revolving credit, maximum borrowing capacity							1,750,000,000
Subsequent event | Credit facility | Tranche B Loans
Subsequent Event [Line Items]
Revolving credit, maximum borrowing capacity							$ 220,000,000

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