Pension Plans (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
U.S. [Member]
Defined Benefit Plan Net Periodic Benefit Cost Abstract
Service cost	$ 4	$ 3	$ 12	$ 10
Interest cost	12	12	35	36
Expected return on plan assets	(17)	(17)	(51)	(49)
Amortization of prior service cost	1	2	5	5
Amortization of net loss	5	4	15	10
Total pension cost	5	4	16	12
Defined Benefit Pension Contributions Disclosure [Abstract]
Pension employer contributions			31
Pension estimated future employer contributions remainder of fiscal year	0		0
Foreign [Member]
Defined Benefit Plan Net Periodic Benefit Cost Abstract
Service cost	4	5	12	13
Interest cost	84	126	281	377
Expected return on plan assets	(59)	(93)	(197)	(279)
Amortization of prior service cost	0	0	0	2
Amortization of net loss	6	9	21	26
Total pension cost	35	$ 47	117	$ 139
Defined Benefit Pension Contributions Disclosure [Abstract]
Pension employer contributions			64
Pension estimated future employer contributions remainder of fiscal year	$ 15		$ 15