Components of Lease Expense (Table) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Leases [Abstract]
Operating lease cost	$ 13	$ 12	$ 42	$ 35
Short-term lease cost	8	9	21	21
Variable operating lease cost	1	2	3	5
Operating cash flows from operating leases	(14)	(12)	(42)	(34)
Right-of-Use asset obtained in exchange for new operating lease liability	$ 26	$ 4	$ 47	$ 21
Weighted-average remaining lease term (years) - operating leases	10 years	11 years	10 years	11 years
Weighted-average discount rate - operating leases	4.10%	4.50%	4.10%	4.50%