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Basis of Presentation Basis of Presentation text (Details) - USD ($) $ / shares in Units, shares in Millions	3 Months Ended		12 Months Ended
	Mar. 31, 2017	Sep. 30, 2016	Dec. 31, 2016	Apr. 13, 2016	Dec. 31, 2015
Stock Warrants Issued	$ 2,900,000
Common Stock, Value, Issued	137,300,000
Total Consideration for Prepetition Indebtedness	704,000,000
Successor Notes	1,000.0
Letters of Credit Outstanding, Amount	$ 167,200,000
6.000% Senior Secured Notes Due 2022 [Member]
Debt Instrument, Face Amount			$ 500,000,000
Stated interest rate - percentage			6.00%
6.375% Senior Secured Notes Due 2025 [Member]
Stated interest rate - percentage			6.375%
Successor Notes [Domain]
Debt Issuance Cost		$ 49,500,000
Term Loan Facility [Member]
Stated interest rate - percentage			4.50%
Line of Credit Facility, Maximum Borrowing Capacity			$ 950,000,000
Term Loan Facility [Member] | Eurocurrency Rate [Member]
Debt Instrument, Interest Rate, Stated Percentage Rate Range, Minimum			1.00%
10.00% Senior Secured Second Lien Notes Due 2022 [Member]
Stated interest rate - percentage			10.00%
Debt Instrument, Outstanding Principal			$ 1,000,000,000
6.50% Senior Notes due September 2020 [Member]
Stated interest rate - percentage	6.50%		6.50%
Debt Instrument, Outstanding Principal			$ 650,000,000
6.00% Senior Notes due November 2018 [Member]
Stated interest rate - percentage	6.00%		6.00%
Debt Instrument, Outstanding Principal			$ 1,518,800,000
6.25% Senior Notes due November 2021 [Member]
Stated interest rate - percentage	6.25%		6.25%
Debt Instrument, Outstanding Principal			$ 1,339,600,000
7.875% Senior Notes due November 2026 [Member]
Stated interest rate - percentage	7.875%		7.875%
Debt Instrument, Outstanding Principal			$ 250,000,000
Convertible Junior Subordinated Debentures due December 2066 [Member]
Debt Instrument, Outstanding Principal			732,500,000
2013 Term Loan Facility due September 2020 [Member]
Debt Instrument, Outstanding Principal			1,170,000,000
Revolving Credit Facility [Member]
Line of Credit Facility, Maximum Borrowing Capacity			1,650,000,000
Letters of Credit Outstanding, Amount				$ 675,000,000
Backstop Commitment Agreement [Domain]
Common Stock, Value, Issued	$ 3,300,000
Private Placement [Member]
Common Stock, Value, Issued	4,800,000
Warrant Agreement [Domain]
Common Stock, Value, Issued	6,200,000
Common Stock [Member]
Common Stock, Value, Issued	$ 200,000		$ 200,000
Common Stock, Par or Stated Value Per Share	$ 0.01		$ 0.01		$ 0.01
Class 2A, 2B, 2C and 5B [Domain]
Common Stock, Value, Issued	$ 11,600,000
Rights Offering [Domain]
Common Stock, Value, Issued	$ 51,200,000
Private Placement Agreement [Domain]
Preferred Stock, Shares Authorized	30.0
Unvested Emergence RSU's [Domain]
Common Stock, Value, Issued	$ 3,600,000
Backstop Commitment Agreement [Member]
Total Consideration for Prepetition Indebtedness	46,000,000
Private Placement Agreement [Domain]
Total Consideration for Prepetition Indebtedness	750,000,000
Private Placement Agreement [Member]
Stock Warrants Issued	3,100,000
Noteholder Co-Proponents [Member]
Stock Warrants Issued	6,200,000
Backstop Commitment Agreement [Member]
Stock Warrants Issued	200,000
Class 2A, 2B, 2C and 5B [Domain]
Common Stock, Value, Issued	0
Capital Units [Member]
Common Stock, Value, Issued	$ 54,500,000

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