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Debt (March 2019 Refinancing) (Details)
1 Months Ended 3 Months Ended
Mar. 31, 2019
USD ($)
Mar. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Debt Instrument [Line Items]      
Principal amount $ 8,198,081,000 $ 8,198,081,000 $ 8,348,775,000
Repurchase principal amount of debt 1,642,200,000 1,642,200,000  
Repayments of debt 1,500,000,000    
Gain on extinguishment of debt   (124,000,000)  
Unamortized discount (premium) and debt issuance costs, net   $ 26,200,000  
Before April 1, 2022      
Debt Instrument [Line Items]      
Redemption price (as percent)   100.00%  
On or after April 1, 2022 beginning principal redemption      
Debt Instrument [Line Items]      
Redemption price (as percent)   105.625%  
Until April 1, 2025 decrease in amount redeemed      
Debt Instrument [Line Items]      
Redemption price (as percent)   100.00%  
Before April 1, 2022 principal redeemed, in part      
Debt Instrument [Line Items]      
Redemption price (as percent)   35.00%  
7.50% Senior Secured Notes due 2027      
Debt Instrument [Line Items]      
Principal amount $ 1,500,000,000.0 $ 1,500,000,000.0 0
Interest rate (as percent) 7.50% 7.50%  
Extinguishment of debt   $ (1,624,000,000)  
Unamortized discount (premium) and debt issuance costs, net   $ 19,100,000  
7.50% Senior Secured Notes due 2027 | Before April 1, 2022 principal amount redeemed      
Debt Instrument [Line Items]      
Redemption price (as percent)   107.50%  
7.25% Senior Notes due 2022      
Debt Instrument [Line Items]      
Principal amount $ 10,084,000 $ 10,084,000 400,000,000
Repurchase principal amount of debt $ 389,900,000 $ 389,900,000  
Interest rate (as percent) 7.25% 7.25%  
5.75% Senior Notes due 2022      
Debt Instrument [Line Items]      
Principal amount $ 182,479,000 $ 182,479,000 700,000,000
Interest rate (as percent) 5.75% 5.75%  
5.375% Senior Notes due 2023      
Debt Instrument [Line Items]      
Principal amount $ 210,440,000 $ 210,440,000 750,000,000
Interest rate (as percent) 5.375% 5.375%  
6.00% Senior Notes due 2023      
Debt Instrument [Line Items]      
Principal amount $ 1,439,840,000 $ 1,439,840,000 $ 1,635,000,000
Interest rate (as percent) 6.00% 6.00%  
Senior notes | 5.75% Senior Notes due 2022      
Debt Instrument [Line Items]      
Repurchase principal amount of debt $ 517,500,000 $ 517,500,000  
Senior notes | 5.375% Senior Notes due 2023      
Debt Instrument [Line Items]      
Repurchase principal amount of debt 539,600,000 539,600,000  
Senior notes | 6.00% Senior Notes due 2023      
Debt Instrument [Line Items]      
Repurchase principal amount of debt 195,200,000 195,200,000  
Senior notes | Note repurchases      
Debt Instrument [Line Items]      
Unamortized discount (premium) and debt issuance costs, net   4,200,000  
Revolving credit facility      
Debt Instrument [Line Items]      
Unamortized discount (premium) and debt issuance costs, net   2,900,000  
Revolving credit facility | 2017 credit agreement      
Debt Instrument [Line Items]      
Commitments not extended $ 76,000,000.0 $ 76,000,000.0  
Revolving credit facility | 2017 credit agreement | Minimum      
Debt Instrument [Line Items]      
Secured leverage ratio 3.50 3.50  
Revolving credit facility | 2017 credit agreement | Maximum      
Debt Instrument [Line Items]      
Secured leverage ratio 4.50 4.50