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Debt, Bank Debt and Credit Facilities (Details)
In Millions, unless otherwise specified
 3 Months Ended 12 Months Ended 0 Months Ended 3 Months Ended 12 Months Ended 3 Months Ended 12 Months Ended 12 Months Ended
Dec. 31, 2011
USD ($)
Dec. 31, 2011
USD ($)
Dec. 31, 2010
USD ($)
Dec. 31, 2009
USD ($)
Aug. 01, 2011
Notes Payable to Banks [Member]
EUR (€)
Dec. 31, 2011
U S Revolver [Member]
USD ($)
Dec. 31, 2011
U S Revolver [Member]
USD ($)
Dec. 31, 2010
U S Revolver [Member]
USD ($)
Dec. 31, 2009
U S Revolver [Member]
USD ($)
Dec. 31, 2011
Former U S Revolver [Member]
USD ($)
Dec. 31, 2011
U S Revolver Letter of Credit [Member]
USD ($)
Dec. 31, 2010
U S Revolver Letter of Credit [Member]
USD ($)
Dec. 31, 2011
Canadian Revolver [Member]
CAD
Dec. 31, 2011
Canadian Revolver [Member]
CAD
Dec. 31, 2010
Canadian Revolver [Member]
CAD
Dec. 31, 2009
Canadian Revolver [Member]
CAD
Dec. 31, 2011
Canadian Revolver Letter of Credit [Member]
CAD
Dec. 31, 2010
Canadian Revolver Letter of Credit [Member]
CAD
Dec. 31, 2011
Other Revolving Letter of Credit [Member]
USD ($)
Dec. 31, 2010
Other Revolving Letter of Credit [Member]
USD ($)
Dec. 31, 2011
Other Letter of Credit [Member]
USD ($)
Dec. 31, 2010
Other Letter of Credit [Member]
USD ($)
Dec. 31, 2011
Maximum [Member]
U S Revolver [Member]
Line of Credit Facility                                              
Line of credit facility, maximum borrowing capacity $ 500 $ 500       $ 3,000 $ 3,000     $ 2,400     115 115                  
Line of credit facility, expiration date June 2012         December 2016             December 2012                    
Letters of credit outstanding 300 300 100     0 0 0     119 399 0 0 0   20 20 0 0 391 176  
Credit Facilities (Textual)                                              
Debt to capitalization ratios as per terms of revolver           0.29 0.29 0.25                             0.6
Borrowings from long-term lines of credit   0 0 39     0 0 39         0 0 0              
Repayments of long-term lines of credit   (4) 0 (39)     0 0 (39)         0 0 0              
Commitment fees                                     0        
Compensating balance requirement                                     0        
Short-term Notes (Textual)                                              
Short-term note         € 2.8                                    
Debt instruments maturity date (month, year)         November 2011