Pension Plans (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
U.S. [Member]
Defined Benefit Plan Net Periodic Benefit Cost Abstract
Service cost	$ 4	$ 4	$ 8	$ 7
Interest cost	11	12	23	24
Expected return on plan assets	(17)	(16)	(34)	(32)
Amortization of prior service cost	2	1	4	3
Amortization of net loss	5	3	10	6
Total pension cost	5	4	11	8
Defined Benefit Pension Contributions Disclosure [Abstract]
Pension employer contributions			26
Pension estimated future employer contributions remainder of fiscal year	0		0
Foreign [Member]
Defined Benefit Plan Net Periodic Benefit Cost Abstract
Service cost	4	4	8	8
Interest cost	95	129	197	251
Expected return on plan assets	(66)	(96)	(138)	(186)
Amortization of prior service cost	0	1	0	2
Amortization of net loss	7	9	15	17
Total pension cost	40	$ 47	82	$ 92
Defined Benefit Pension Contributions Disclosure [Abstract]
Pension employer contributions			48
Pension estimated future employer contributions remainder of fiscal year	$ 35		$ 35