Leases - Additional Information (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2020
Lessee, Lease, Description [Line Items]
Short-term lease commitment, amount		$ 44
Operating lease, expenses incurred	$ 94
Operating leases, contingent rentals	$ 88
Minimum [Member]
Lessee, Lease, Description [Line Items]
Lessee, operating lease, renewal term		1 month
Lessee, finance lease, renewal term		1 month
Lessor, operating lease, term of contract		1 month
Maximum [Member]
Lessee, Lease, Description [Line Items]
Lessee, operating lease, renewal term		40 years
Lessee, finance lease, renewal term		40 years
Lessor, operating lease, term of contract		50 years