Revenues - Additional Information (Details) - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Capitalized Contract Cost [Line Items]
Capitalized contract, impairment loss	$ 0	$ 0	$ 0
Deferred revenue	581,000,000	459,000,000
Revenue recognized which was previously included in deferred revenue	256,000,000	219,000,000	181,000,000
Sales Commissions
Capitalized Contract Cost [Line Items]
Deferred commissions	23,000,000	21,000,000
Amortization expense related to commissions	14,000,000	11,000,000	$ 10,000,000
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2020-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Remaining performance obligation		$ 724,000,000
Remaining performance obligation period of recognition		2 years
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Remaining performance obligation	$ 974,000,000
Remaining performance obligation period of recognition	2 years
Prepaid expenses and other current assets
Capitalized Contract Cost [Line Items]
Contract assets	$ 10,000,000	$ 8,000,000