Leases Supplemental Information (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Leases [Abstract]
Document Period End Date	Dec. 31, 2019
Operating Lease, Right-of-Use Asset	$ 51
Operating Lease, Liability, Current	8
Operating Lease, Liability, Noncurrent	43
Operating Lease, Liability	51
Finance Lease, Right-of-Use Asset	150
Finance Lease, Liability, Current	16	$ 0
Finance Lease, Liability, Noncurrent	135	$ 0
Finance Lease, Liability	$ 151