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Deferred Contract Costs - (Narratives) (Details) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]        
Amortization of contract costs $ 48,000,000 $ 30,000,000 $ 136,000,000 $ 89,000,000
Deferred contract costs impairment $ 0 $ 0 $ 0 $ 0