Leases (Details) $ in Millions	Dec. 31, 2016 USD ($)
Leases [Abstract]
Operating Leases, Future Minimum Payments Due, Next Twelve Months	$ 220
Operating Leases, Future Minimum Payments, Due in Two Years	170
Operating Leases, Future Minimum Payments, Due in Three Years	121
Operating Leases, Future Minimum Payments, Due in Four Years	83
Operating Leases, Future Minimum Payments, Due in Five Years	62
Thereafter	187
Total minimum lease payments	$ 843