Revenue from Contract with Customer - Narrative (Details) $ in Millions	3 Months Ended	6 Months Ended
	Jun. 30, 2020 USD ($)	Jun. 30, 2020 USD ($) segment	Dec. 31, 2019 USD ($)
Disaggregation of Revenue
Contract with customer, asset, after allowance for credit loss	$ 8	$ 8	$ 10
Revenue, performance obligation, description of payment terms	30 to 90 days
Contract with customer, liability, current	$ 12	12	10
Contract with customer, liability, noncurrent	6	6	12
Contract with customers receivable, current	38	38	37
Contract with customers receivable, non-current	$ 171	$ 171	$ 180
Number of reportable segments | segment		2
Minimum
Disaggregation of Revenue
Capitalized contract costs, amortization period		3 years
Maximum
Disaggregation of Revenue
Capitalized contract costs, amortization period		7 years