XML 55 R41.htm IDEA: XBRL DOCUMENT v3.20.1
Deferred Contract Costs - (Narratives) (Details) - USD ($)
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]    
Amortization of contract costs $ 51,000,000 $ 44,000,000
Deferred contract costs impairment $ 0 $ 0