Leases - Narrative (Details) $ in Millions	9 Months Ended
	Sep. 30, 2021 USD ($) renewalOption renewal_option
Lessee, Lease, Description [Line Items]
Finance lease, extension term	4 years
Building
Lessee, Lease, Description [Line Items]
Operating lease, number of renewal options | renewal_option	1
Building | GEORGIA
Lessee, Lease, Description [Line Items]
Operating lease, number of renewal options | renewal_option	1
Operating lease term	10 years
Lease not yet commenced, undiscounted future payments | $	$ 162
Building | CALIFORNIA
Lessee, Lease, Description [Line Items]
Lease not yet commenced, undiscounted future payments | $	$ 51
Lease not yet commenced, term	12 years
Lease not yet commenced, number of renewal options | renewalOption	2
Lease not yet commenced, renewal option term	5 years
Minimum
Lessee, Lease, Description [Line Items]
Finance lease, term of contract	2 years
Minimum | Building
Lessee, Lease, Description [Line Items]
Operating lease, renewal term	1 year
Maximum
Lessee, Lease, Description [Line Items]
Finance lease, term of contract	5 years
Maximum | Building
Lessee, Lease, Description [Line Items]
Operating lease, renewal term	20 years