Leases (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Leases [Abstract]
Operating Leases, Rent Expense, Net	$ 76	$ 76	$ 77
Operating Leases, Future Minimum Payments Due, Current	58
Operating Leases, Future Minimum Payments, Due in Two Years	44
Operating Leases, Future Minimum Payments, Due in Three Years	36
Operating Leases, Future Minimum Payments, Due in Four Years	27
Operating Leases, Future Minimum Payments, Due in Five Years	21
Operating Leases, Future Minimum Payments, Due Thereafter	43
Operating Leases, Future Minimum Payments Due	$ 229