Pension Plans (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
U.S. [Member]
Defined Benefit Plan Net Periodic Benefit Cost Abstract
Service cost	$ 3	$ 4	$ 6	$ 8
Interest cost	10	11	20	23
Expected return on plan assets	(16)	(17)	(33)	(34)
Amortization of prior service cost	2	2	4	4
Amortization of net loss	4	5	9	10
Total pension cost	3	5	6	11
Defined Benefit Pension Contributions Disclosure [Abstract]
Pension employer contributions			21
Pension estimated future employer contributions remainder of fiscal year	0		0
Foreign [Member]
Defined Benefit Plan Net Periodic Benefit Cost Abstract
Service cost	3	4	6	8
Interest cost	86	95	163	197
Expected return on plan assets	(55)	(66)	(105)	(138)
Amortization of prior service cost	0	0	0	0
Amortization of net loss	4	7	9	15
Total pension cost	38	$ 40	73	$ 82
Defined Benefit Pension Contributions Disclosure [Abstract]
Pension employer contributions			59
Pension estimated future employer contributions remainder of fiscal year	$ 38		$ 38