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Emergence from the Chapter 11 Cases and Fresh Start Reporting - Debt Securities (Details) - USD ($)	Apr. 03, 2017	Apr. 01, 2017	Feb. 15, 2017
Fresh-Start Adjustment [Line Items]
Debt canceled		$ (950,000,000)
Effect of Plan
Fresh-Start Adjustment [Line Items]
Debt canceled		$ (903,200,000)
6.00% Senior Secured Notes due March 2022 | Senior Notes | Effect of Plan
Fresh-Start Adjustment [Line Items]
Principal amount			$ 500,000,000.0
Stated interest rate			6.00%
6.00% Senior Secured Notes due March 2022 | Senior Notes | Effect of Plan
Fresh-Start Adjustment [Line Items]
Principal amount			$ 500,000,000.0
Stated interest rate			6.375%
Successor Credit Agreement | Term Loan | Effect of Plan
Fresh-Start Adjustment [Line Items]
Principal amount	$ 950,000,000
10.00% Senior Secured Second Lien Notes due March 2022 | Senior Notes | Effect of Plan
Fresh-Start Adjustment [Line Items]
Stated interest rate		10.00%
Debt canceled		$ 1,000,000,000.0
6.50% Senior Notes due September 2020 | Senior Notes | Effect of Plan
Fresh-Start Adjustment [Line Items]
Stated interest rate		6.50%
Debt canceled		$ 650,000,000.0
6.00% Senior Notes due November 2018 | Senior Notes | Effect of Plan
Fresh-Start Adjustment [Line Items]
Stated interest rate		6.00%
Debt canceled		$ 1,518,800,000.0
6.25% Senior Notes due November 2021 | Senior Notes | Effect of Plan
Fresh-Start Adjustment [Line Items]
Stated interest rate		6.25%
Debt canceled		$ 1,339,600,000.0
7.875% Senior Notes due November 2026 | Senior Notes | Effect of Plan
Fresh-Start Adjustment [Line Items]
Stated interest rate		7.875%
Debt canceled		$ 250,000,000.0
Convertible Junior Subordinated Debentures due December 2066 | Subordinated Debt | Effect of Plan
Fresh-Start Adjustment [Line Items]
Debt canceled		732,500,000.0
2013 Term Loan Facility | Term Loan | Effect of Plan
Fresh-Start Adjustment [Line Items]
Credit facility canceled		1,170,000,000
2013 Revolver | Effect of Plan
Fresh-Start Adjustment [Line Items]
Credit facility canceled		947,000,000
2013 Revolver | Revolving Credit Facility | Effect of Plan
Fresh-Start Adjustment [Line Items]
Credit facility canceled		1,650,000,000
2013 Revolver | Letter of Credit | Effect of Plan
Fresh-Start Adjustment [Line Items]
Credit facility canceled		$ 675,000,000
London Interbank Offered Rate (LIBOR) | Successor Credit Agreement | Term Loan | Effect of Plan
Fresh-Start Adjustment [Line Items]
Basis spread on variable rate	4.50%
Floor interest rate	1.00%

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