Leases - Other Information (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Leases [Abstract]
Operating cash flows for operating leases	$ 22
Operating cash flows for operating leases	4
Financing cash flows for finance leases	$ 33	$ 5	$ 0