Debt, Bank Debt and Credit Facilities (Details) In Millions, unless otherwise specified	3 Months Ended	9 Months Ended				3 Months Ended	9 Months Ended					3 Months Ended	9 Months Ended					3 Months Ended		3 Months Ended				0 Months Ended
	Sep. 30, 2011 USD ($)	Sep. 30, 2011 USD ($)	Sep. 30, 2010 USD ($)	Dec. 31, 2010 USD ($)	Sep. 30, 2011 Maximum [Member] U S Revolver [Member]	Sep. 30, 2011 U S Revolver [Member] USD ($)	Sep. 30, 2011 U S Revolver [Member] USD ($)	Sep. 30, 2010 U S Revolver [Member] USD ($)	Dec. 31, 2010 U S Revolver [Member] USD ($)	Sep. 30, 2011 U S Revolver Letter of Credit [Member] USD ($)	Dec. 31, 2010 U S Revolver Letter of Credit [Member] USD ($)	Sep. 30, 2011 Canadian Revolver [Member] USD ($)	Sep. 30, 2011 Canadian Revolver [Member] USD ($)	Sep. 30, 2010 Canadian Revolver [Member] USD ($)	Dec. 31, 2010 Canadian Revolver [Member] USD ($)	Sep. 30, 2011 Canadian Revolver Letter of Credit [Member] USD ($)	Dec. 31, 2010 Canadian Revolver Letter of Credit [Member] USD ($)	Sep. 30, 2011 Short Term Revolving Letter of Credit [Member] USD ($)	Dec. 31, 2010 Short Term Revolving Letter of Credit [Member] USD ($)	Sep. 30, 2011 One Year Revolving Letter Of Credit [Member] USD ($)	Dec. 31, 2010 One Year Revolving Letter Of Credit [Member] USD ($)	Sep. 30, 2011 Other Letter of Credit [Member] USD ($)	Dec. 31, 2010 Other Letter of Credit [Member] USD ($)	Aug. 01, 2011 Notes Payable to Banks [Member] EUR (€)
Line of Credit Facility
Line of credit facility, maximum borrowing capacity						$ 2,400	$ 2,400					$ 115	$ 115					$ 200		$ 300
Line of credit facility, expiration date						November 2012						December 2012						June 2012		June 2012
Letters of credit outstanding						0	0		0	74	399	0	0		0	20	20	0	0	300	100	346	176
Credit Facilities (Textual)
Debt to capitalization ratios as per terms of revolver					0.60	0.22	0.22		0.25
Borrowings from long-term lines of credit							0	0					0	0
Repayments of long-term lines of credit							0	0					0	0
Short-term notes (Textual)
Short-term note																								2.8
Debt instruments maturity date (month, year)																								February 2012
Accounts Receivable Sales Facility (Textual)
Maximum eligible trade receivables	1,000	1,000
Extended term of accounts receivable sales facility	June 2012
Eligible receivables sold to third party entities and financial institutions	100	100		100
Sale of eligible receivable to third party entities and financial institutions		0	1,225
Repayment of eligible receivables		$ 0	$ 1,325