Leases, Additional Information (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019
Lessee, Lease, Description [Line Items]
Operating Lease Extension Term	20 years
Operating Lease, Payments	$ 20	$ 18
Finance Lease, Interest Payment on Liability	3	0
Finance Lease, Principal Payments	1	0
Right-of-Use Asset Obtained in Exchange for Operating Lease Liability	$ 6	$ 33
Finance Lease, Weighted Average Remaining Lease Term	5 years	5 years
Finance Lease, Weighted Average Discount Rate, Percent	3.00%	4.00%
Right-of-Use Asset Obtained in Exchange for Finance Lease Liability	$ 5	$ 5
Operating Lease, Weighted Average Remaining Lease Term	6 years	5 years
Operating Lease, Weighted Average Discount Rate, Percent	4.00%	4.00%
Minimum
Lessee, Lease, Description [Line Items]
Lessee, Operating Lease, Renewal Term	1 year
Lessee, Finance Lease, Renewal Term	1 year
Maximum
Lessee, Lease, Description [Line Items]
Lessee, Operating Lease, Renewal Term	21 years
Lessee, Finance Lease, Renewal Term	21 years