Employee Benefit Plans - Schedule of Components of Net Periodic Cost (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Net periodic cost
Curtailment gain	$ (18)
United States Pension Plan of US Entity [Member]
Net periodic cost
Service cost	64	$ 70	$ 65
Interest cost	26	28	21
Expected return on plan assets	(49)	(44)	(39)
Amortization of prior service credit	1	0	0
Amortization of net actuarial loss	9	8	13
Curtailment gain	0	0	0
Other	(8)	0	0
Net periodic cost	59	62	60
Foreign Pension Plan [Member]
Net periodic cost
Service cost	15	11	12
Interest cost	30	34	31
Expected return on plan assets	(47)	(41)	(37)
Amortization of prior service credit	0	0	0
Amortization of net actuarial loss	6	5	8
Curtailment gain	(1)	0	0
Other	0	0	(2)
Net periodic cost	3	9	16
Other Postretirement Benefits
Net periodic cost
Service cost	5	6	6
Interest cost	4	5	5
Expected return on plan assets	0	0	0
Amortization of prior service credit	(11)	(11)	(7)
Amortization of net actuarial loss	1	1	2
Curtailment gain	(17)	0	0
Other	0	3	0
Net periodic cost	$ (18)	$ (2)	$ 6