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Debt, Bank Debt and Credit Facilities (Details)
 9 Months Ended 0 Months Ended 1 Months Ended 0 Months Ended 9 Months Ended 9 Months Ended 9 Months Ended 9 Months Ended
Sep. 30, 2013
USD ($)
Sep. 30, 2012
USD ($)
May 01, 2013
Spinoff [Member]
USD ($)
Mar. 20, 2013
Spinoff [Member]
USD ($)
May 01, 2013
Spinoff [Member]
Notes Payable to Banks [Member]
USD ($)
Oct. 24, 2013
Spinoff [Member]
Notes Payable to Banks [Member]
Subsequent Event [Member]
USD ($)
Apr. 16, 2013
Spinoff [Member]
Sourced From Parent's Short-Term Borrowings [Member]
Notes Payable to Banks [Member]
USD ($)
Mar. 20, 2013
Revolving Credit Facility [Member]
Spinoff [Member]
USD ($)
Sep. 30, 2013
Letter of Credit [Member]
USD ($)
Dec. 31, 2012
Letter of Credit [Member]
USD ($)
Sep. 30, 2013
U S Revolver [Member]
USD ($)
Sep. 30, 2012
U S Revolver [Member]
USD ($)
Dec. 31, 2012
U S Revolver [Member]
USD ($)
Sep. 30, 2013
U S Revolver [Member]
Maximum [Member]
Sep. 30, 2013
U S Revolver Letter of Credit [Member]
USD ($)
Dec. 31, 2012
U S Revolver Letter of Credit [Member]
USD ($)
Sep. 30, 2013
Canadian Revolver [Member]
CAD
Sep. 30, 2012
Canadian Revolver [Member]
CAD
Dec. 31, 2012
Canadian Revolver [Member]
CAD
Sep. 30, 2013
Canadian Revolver Letter of Credit [Member]
CAD
Dec. 31, 2012
Canadian Revolver Letter of Credit [Member]
CAD
Mar. 20, 2013
Line of Credit [Member]
Spinoff [Member]
USD ($)
Sep. 30, 2013
Other Letter of Credit [Member]
USD ($)
Dec. 31, 2012
Other Letter of Credit [Member]
USD ($)
Sep. 30, 2013
A/R Sales Facility [Member]
USD ($)
Sep. 30, 2012
A/R Sales Facility [Member]
USD ($)
Line of Credit Facility                                                    
Line of credit facility, maximum borrowing capacity       $ 800,000,000       $ 300,000,000 $ 550,000,000   $ 3,000,000,000           50,000,000         $ 500,000,000     $ 1,500,000,000  
Line of credit facility, expiration date (month, year)                 June 2014   December 2016           November 2013                  
Amount outstanding                 292,000,000 418,000,000 0   0   59,000,000 59,000,000 0   0 10,000,000 10,000,000   257,000,000 275,000,000    
Accounts Receivable Sales Facility                                                    
Balance as of beginning of period                                                 100,000,000 250,000,000
Proceeds from the sale of receivables 0 1,500,000,000                                             0 1,500,000,000
Repayments 0 (1,650,000,000)                                             0 (1,650,000,000)
Balance as of end of period                                                 100,000,000 100,000,000
Credit Facilities (Textual)                                                    
Debt to capitalization ratios as per terms of revolver                     0.20   0.23 0.60                        
Borrowings from long-term lines of credit 0 1,100,000,000                 0 1,100,000,000         0 0                
Repayments of long-term lines of credit 0 1,100,000,000                 0 1,100,000,000         0 0                
Proceeds from short-term debt 550,000,000 0       525,000,000 550,000,000                                      
Senior unsecured bonds of CST issued to us     550,000,000                                              
CST bonds exchanged in settlement of short-term borrowings         $ 550,000,000                                          
Ownership percentage retained     20.00%                                              
Accounts Receivable Sales Facility (Textual)                                                    
Maturity date of accounts receivable sales facility                                                 July 2014