Employee Benefit Plan - Change in PBO (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Pension Benefits
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Benefit obligation at beginning of year	$ 509	$ 489
Service cost	8	18	$ 10
Interest cost	15	20	17
Plan participants’ contributions	1	1
Actuarial losses (gains)	3	78
Exchange rate changes	(29)	(52)
Benefit payments	(12)	(14)
Curtailments	0	(23)
Settlements	(59)	(8)
Benefit obligation at end of year	436	509	489
U. S. Postretirement Benefits
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Benefit obligation at beginning of year	9	11
Service cost	0	0	0
Interest cost	0	0	0
Plan participants’ contributions	0	0
Actuarial losses (gains)	1	(1)
Exchange rate changes	0	0
Benefit payments	(1)	(1)
Curtailments	0	0
Settlements	0	0
Benefit obligation at end of year	$ 9	$ 9	$ 11