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Debt - Revolving Credit Facility Narrative (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Mar. 31, 2017
Dec. 31, 2016
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Sep. 30, 2016
Sep. 30, 2016
Oct. 31, 2016
Oct. 14, 2016
Jun. 30, 2016
Dec. 31, 2015
Long-Term Debt Instrument [Line Items]                        
Debt Instrument, Face Amount             $ 8,717 $ 8,717       $ 9,706
Subsequent Event [Member]                        
Long-Term Debt Instrument [Line Items]                        
Debt Instrument, Face Amount                   $ 105    
6.75% Senior Notes Due 2019 [Member] | Senior Notes [Member] | Redemption of 2019 Notes [Member]                        
Long-Term Debt Instrument [Line Items]                        
Supersedeas Bond               461        
Revolving Credit Facility [Member]                        
Long-Term Debt Instrument [Line Items]                        
Borrowing capacity             4,000 4,000        
Letters of Credit Outstanding, Amount             $ 709 $ 709        
Line of Credit Facility, Description               The amendment reduces the interest coverage ratio from 1.1 to 1.0 to 0.65 to 1.0 through the first quarter of 2017, after which it will increase to 0.70 to 1.0 through the second quarter of 2017, 1.2 to 1.0 through the third quarter of 2017 and 1.25 to 1.0 thereafter. The amendment also includes a collateral value coverage test whereby if the collateral value coverage ratio, tested as of December 31, 2016, falls below 1.1 to 1.0, the $500 million minimum liquidity covenant increases to $750 million, and if the collateral value coverage ratio, tested as of March 31, 2017, falls below 1.25 to 1.0, our borrowing ability will be reduced in order to satisfy such ratio. The amendment also gives us the ability to incur up to $2.5 billion of first lien indebtedness secured on a pari passu basis with the existing obligations under the credit agreement, subject to a position in the collateral proceeds waterfall in favor of the revolving lenders and the other limitations on junior lien debt set forth in the credit agreement. After taking into account the term loan, the amount of additional first lien indebtedness permitted by the revolving credit facility is $1.0 billion.        
Interest Coverage Ratio             1.1 to 1.0          
Minimum Liquidity Requirement ($ in millions) When Covenant Ratio Is At Or Above 1.1 to 1.0               $ 500        
Revolving Credit Facility [Member] | Subsequent Event [Member]                        
Long-Term Debt Instrument [Line Items]                        
Borrowing capacity                 $ 3,800      
Revolving Credit Facility [Member] | Scenario, Forecast [Member]                        
Long-Term Debt Instrument [Line Items]                        
Interest Coverage Ratio     1.25 to 1.0 1.2 to 1.0 0.70 to 1.0 0.65 to 1.0            
Minimum Liquidity Requirement ($ in millions) If Covenant Ratio Is Below 1.25 to 1.0 $ 750                      
Revolving Credit Facility [Member] | Minimum [Member] | Scenario, Forecast [Member]                        
Long-Term Debt Instrument [Line Items]                        
Collateral Value Coverage Ratio 1.25 to 1.0 1.1 to 1.0                    
Revolving Credit Facility [Member] | First Lien [Member] | Maximum [Member]                        
Long-Term Debt Instrument [Line Items]                        
Additional Indebtedness             $ 1,000 1,000     $ 2,500  
Revolving Credit Facility [Member] | Line of Credit [Member]                        
Long-Term Debt Instrument [Line Items]                        
Debt Instrument, Face Amount             $ 240 $ 240       $ 0