Leases - Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Lessee, Lease, Description [Line Items]
Operating lease, renewal term	10 years
Finance lease, right-of-use asset	$ 52	$ 35
Finance lease, right-of-use asset, accumulated depreciation	6	2
Operating lease, lease not yet commenced, amount	$ 12	$ 1
Minimum
Lessee, Lease, Description [Line Items]
Lessee, operating lease, remaining lease term	1 month
Operating lease, termination period	1 month
Operating lease, lease not yet commenced, term of contract	3 years
Maximum
Lessee, Lease, Description [Line Items]
Lessee, operating lease, remaining lease term	14 years 7 months 6 days
Operating lease, termination period	1 year
Operating lease, lease not yet commenced, term of contract	5 years