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Long-Term Debt (8.625% Senior Secured Notes, Due 2024 Narrative) (Details) - USD ($)
12 Months Ended
Jul. 06, 2018
Dec. 31, 2018
Dec. 31, 2017
Debt Instrument [Line Items]      
Issuance of long-term debt   $ 1,033,000,000 $ 3,100,000,000
Senior Secured Notes [Member] | Senior Secured Notes at 8.625, Due 2024 [Member]      
Debt Instrument [Line Items]      
Debt instrument, offering date   Jul. 06, 2018  
Principal amount of senior notes issued $ 1,033,000,000    
Debt instrument stated interest rate 8.625%    
Debt Instrument, Redemption, Period One [Member] | Senior Secured Notes [Member] | Senior Secured Notes at 8.625, Due 2024 [Member]      
Debt Instrument [Line Items]      
Debt instrument redemption price percentage 100.00%    
Debt Instrument, Redemption, Period Two [Member] | Senior Secured Notes [Member] | Senior Secured Notes at 8.625, Due 2024 [Member]      
Debt Instrument [Line Items]      
Maximum principal redeemable using proceeds from a public equity offering, as a percentage of principal amount 40.00%    
Debt instrument redemption price percentage 108.625%    
Minimum period notice for redemption of debt 15 days    
Maximum period notice for redemption of debt 60 days