Retirement Plans, Net Periodic Benefit Cost, Assumptions, and Expected Cash Flows (Details) (International [Member], USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
International [Member]
Components of net periodic benefit cost [Abstract]
Total net periodic benefit cost	$ 27	$ 28	$ 32
Actuarial assumptions used to determine benefit obligation [Abstract]
Discount rate (in hundredths)	5.20%	5.70%
Rate of compensation increase (in hundredths)	5.40%	5.20%
Weighted-average actuarial assumptions used to determine net periodic benefit costs [Abstract]
Discount rate (in hundredths)	7.10%	7.90%	7.40%
Expected long-term return on plan assets (in hundredths)	5.70%	5.60%	5.60%
Rate of compensation increase (in hundredths)	6.20%	6.40%	5.70%
Expected cash flows [Abstract]
Expected contribution to pension plans in the next fiscal year	11
Expected future annual benefit payments for the next 10 years	$ 25
Number of years current level annual benefit payments are estimated to be made	10