Pension Plans (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
U.S. [Member]
Defined Benefit Plan Net Periodic Benefit Cost Abstract
Service cost	$ 4	$ 3	$ 8	$ 7
Interest cost	11	12	22	24
Expected return on plan assets	(16)	(14)	(31)	(28)
Amortization of prior service cost	2	2	3	3
Amortization of net loss	7	6	14	12
Total pension cost	8	9	16	18
Defined Benefit Pension Contributions Disclosure [Abstract]
Defined Benefit Plan Contributions By Employer			50
Defined Benefit Plan Estimated Future Employer Contributions Remainder Of Fiscal Year	2		2
Foreign [Member]
Defined Benefit Plan Net Periodic Benefit Cost Abstract
Service cost	7	3	14	10
Interest cost	135	126	274	267
Expected return on plan assets	(127)	(111)	(257)	(233)
Amortization of prior service cost	0	0	0	0
Amortization of net loss	21	11	42	21
Total pension cost	36	29	73	65
Defined Benefit Pension Contributions Disclosure [Abstract]
Defined Benefit Plan Contributions By Employer			47
Defined Benefit Plan Estimated Future Employer Contributions Remainder Of Fiscal Year	$ 124		$ 124