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Debt - Debt to Affiliates - Revolving Credit Facility (Details) - USD ($)
$ in Millions
Jun. 30, 2017
Mar. 16, 2017
Dec. 31, 2016
Debt Instrument [Line Items]      
Debt instrument, face amount $ 1,500 $ 1,500  
Deutsche Telekom [Member]      
Debt Instrument [Line Items]      
Debt instrument, face amount 500    
Secured Revolving Credit Facility [Member] | Line of Credit [Member] | Deutsche Telekom [Member]      
Debt Instrument [Line Items]      
Short-term debt to affiliates 680   $ 0
Secured Revolving Credit Facility [Member] | Line of Credit [Member] | Deutsche Telekom [Member] | Revolving Credit Facility [$2.5B] [Member]      
Debt Instrument [Line Items]      
Incremental term loan commitment $ 1,500