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Debt - Debt to Affiliates - Revolving Credit Facility (Details) - USD ($)
1 Months Ended
Mar. 31, 2018
Sep. 30, 2018
Jan. 31, 2018
Dec. 31, 2017
Debt Instrument [Line Items]        
Principal Amount   $ 3,424,000,000    
Affiliated Entity        
Debt Instrument [Line Items]        
Principal Amount      
6.125% Senior Notes due 2022 | Senior Notes        
Debt Instrument [Line Items]        
Principal Amount   $ 1,000,000,000 $ 1,000,000,000  
Interest rate, stated percentage   6.125% 6.125%  
Revolving Credit Facility [$2.5B] | Affiliated Entity | Secured Revolving Credit Facility | Minimum        
Debt Instrument [Line Items]        
Applicable margin, percentage 1.05%      
Undrawn commitment fee, percentage 0.25%      
Revolving Credit Facility [$2.5B] | Affiliated Entity | Secured Revolving Credit Facility | Maximum        
Debt Instrument [Line Items]        
Applicable margin, percentage 1.80%      
Undrawn commitment fee, percentage 0.45%      
Revolving Credit Facility [$2.5B] | Affiliated Entity | Unsecured Revolving Credit Facility | Minimum        
Debt Instrument [Line Items]        
Applicable margin, percentage 2.05%      
Undrawn commitment fee, percentage 0.20%      
Revolving Credit Facility [$2.5B] | Affiliated Entity | Unsecured Revolving Credit Facility | Maximum        
Debt Instrument [Line Items]        
Applicable margin, percentage 3.05%      
Undrawn commitment fee, percentage 0.575%      
Revolving Credit Facility [$2.5B] | Line of Credit | Affiliated Entity | Secured Revolving Credit Facility | Deutsche Telekom AG        
Debt Instrument [Line Items]        
Short-term debt to affiliates   $ 0   $ 0