Pension Plans (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
U.S. [Member]
Defined Benefit Plan Net Periodic Benefit Cost Abstract
Service cost	$ 4	$ 4	$ 12	$ 11
Interest cost	11	11	33	35
Expected return on plan assets	(15)	(13)	(46)	(41)
Amortization of prior service cost	1	1	4	4
Amortization of net loss	7	6	21	18
Total pension cost	8	9	24	27
Defined Benefit Pension Contributions Disclosure [Abstract]
Pension employer contributions			52
Pension estimated future employer contributions remainder of fiscal year	0		0
Foreign [Member]
Defined Benefit Plan Net Periodic Benefit Cost Abstract
Service cost	6	4	20	13
Interest cost	122	123	394	390
Expected return on plan assets	(114)	(107)	(371)	(340)
Amortization of prior service cost	0	0	0	0
Amortization of net loss	18	9	59	30
Total pension cost	32	29	102	93
Defined Benefit Pension Contributions Disclosure [Abstract]
Pension employer contributions			109
Pension estimated future employer contributions remainder of fiscal year	$ 55		$ 55