Leases - Schedule of Right of Use Assets (Details) - USD ($) $ in Millions	Sep. 30, 2019	Jan. 01, 2019
Lessee, Lease, Description [Line Items]
Total right-of-use assets	$ 21	$ 14
Buildings
Lessee, Lease, Description [Line Items]
Total right-of-use assets	19
Land
Lessee, Lease, Description [Line Items]
Total right-of-use assets	1
Vehicles
Lessee, Lease, Description [Line Items]
Total right-of-use assets	$ 1