Leases (Details) $ in Millions	Dec. 31, 2018 USD ($)
Leases [Abstract]
Operating Leases, Future Minimum Payments Due, Next Twelve Months	$ 214
Operating Leases, Future Minimum Payments, Due in Two Years	149
Operating Leases, Future Minimum Payments, Due in Three Years	121
Operating Leases, Future Minimum Payments, Due in Four Years	95
Operating Leases, Future Minimum Payments, Due in Five Years	52
Thereafter	177
Total minimum lease payments	$ 808