Pension Plans (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
U.S. [Member]
Defined Benefit Plan Net Periodic Benefit Cost Abstract
Service cost	$ 4	$ 4
Interest cost	11	12
Expected return on plan assets	(15)	(14)
Amortization of prior service cost	1	1
Amortization of net loss	7	6
Loss on curtailment	0	0
Total pension cost	8	9
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
Foreign [Member]
Defined Benefit Plan Net Periodic Benefit Cost Abstract
Service cost	7	7
Interest cost	139	141
Expected return on plan assets	(130)	(122)
Amortization of prior service cost	0	0
Amortization of net loss	21	10
Loss on curtailment	0	0
Total pension cost	37	36
Defined Benefit Pension Contributions Disclosure [Abstract]
Defined Benefit Plan Contributions By Employer	37
Defined Benefit Plan Estimated Future Employer Contributions Remainder Of Fiscal Year	$ 132