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Leases - Additional Information (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Jul. 31, 2020
Lessee, Lease, Description [Line Items]
Short-term lease expense	$ 2	$ 2	$ 6	$ 6
Minimum
Lessee, Lease, Description [Line Items]
Renewal term			1 year
Financing lease not yet commenced, amount expected to be capitalized at commencement					$ 20
Maximum
Lessee, Lease, Description [Line Items]
Renewal term			20 years
Financing lease not yet commenced, amount expected to be capitalized at commencement					$ 25