Leases - Schedule of Lease Obligations (Details) - USD ($) $ in Millions	Sep. 30, 2019	Jan. 01, 2019	Dec. 31, 2018
Operating Leases
Other current liabilities	$ 18	$ 16
Operating lease non-current liabilities	81	$ 57
Related party leases	0
Total lease liabilities	99
Finance Leases
Other current liabilities	1
Finance lease non-current liabilities	33		$ 1
Related party leases	12
Total lease liabilities	$ 46