Employee Retirement Benefits (Net Periodic Pension Expense) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
U.S. Pension Plan
Components of Net Periodic Benefit Cost:
Service cost	$ 1	$ 1	$ 2	$ 3
Interest cost	5	5	16	16
Expected return on plan assets	(7)	(9)	(21)	(25)
Net amortizations	2	0	6	2
Settlement loss	0	1	1	3
Net periodic pension expense (benefit)	1	(2)	4	(1)
Non U.S. Pension Plan
Components of Net Periodic Benefit Cost:
Service cost	0	0	1	1
Interest cost	2	3	6	7
Expected return on plan assets	(3)	(3)	(9)	(11)
Net amortizations	0	0	0	1
Settlement loss	0	2	0	2
Net periodic pension expense (benefit)	$ (1)	$ 2	$ (2)	$ 0