Pension Plans (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
U.S. [Member]
Defined Benefit Plan Net Periodic Benefit Cost Abstract
Service cost	$ 3	$ 4	$ 9	$ 12
Interest cost	10	12	30	35
Expected return on plan assets	(17)	(17)	(50)	(51)
Amortization of prior service cost	2	1	6	5
Amortization of net loss	5	5	14	15
Total pension cost	3	5	9	16
Defined Benefit Pension Contributions Disclosure [Abstract]
Pension employer contributions			22
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	9	12
Interest cost	92	84	255	281
Expected return on plan assets	(59)	(59)	(164)	(197)
Amortization of prior service cost	0	0	0	0
Amortization of net loss	5	6	14	21
Total pension cost	41	$ 35	114	$ 117
Defined Benefit Pension Contributions Disclosure [Abstract]
Pension employer contributions			103
Pension estimated future employer contributions remainder of fiscal year	$ 41		$ 41