Revenue Recognition - Additional Information (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Revenue recognized	$ 630	$ 295
Minimum
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Contract term	1 year
Maximum
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Contract term	5 years
Consumer Customers | Weighted Average
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Length of customer life	30 months
Business Customer
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Length of customer life	49 months
Business Customer | Minimum
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Length of customer life	12 months
Business Customer | Maximum
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Length of customer life	60 months