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Separation of Retail Business (Details) (USD $)
 9 Months Ended 0 Months Ended 3 Months Ended 0 Months Ended 1 Months Ended 0 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Dec. 31, 2012
Dec. 31, 2011
May 01, 2013
Spinoff [Member]
Jun. 30, 2013
Spinoff [Member]
May 01, 2013
Spinoff [Member]
Notes Payable to Banks [Member]
Oct. 24, 2013
Spinoff [Member]
Notes Payable to Banks [Member]
Subsequent Event [Member]
Apr. 16, 2013
Spinoff [Member]
Sourced From Parent's Short-Term Borrowings [Member]
Notes Payable to Banks [Member]
May 01, 2013
Spinoff [Member]
Sourced From Entity Spunoff [Member]
May 01, 2013
Spinoff [Member]
Cash Proceeds Net of Tax Liability [Member]
Assets                      
Cash and temporary cash investments $ 1,908,000,000 $ 2,549,000,000 $ 1,723,000,000 $ 1,024,000,000 $ 315,000,000            
Credit card receivables from Valero         44,000,000            
Other receivables, net         109,000,000            
Inventories 7,063,000,000   5,973,000,000   170,000,000            
Deferred income taxes 257,000,000   274,000,000   14,000,000            
Prepaid expenses and other 131,000,000   154,000,000   13,000,000            
Total current assets 18,593,000,000   16,460,000,000   665,000,000            
Property, plant and equipment, at cost 33,652,000,000   34,132,000,000   1,891,000,000            
Accumulated depreciation (8,010,000,000)   (7,832,000,000)   (611,000,000)            
Property, plant and equipment, net 25,642,000,000   26,300,000,000   1,280,000,000            
Intangible assets, net 160,000,000   213,000,000   38,000,000            
Deferred charges and other assets, net 1,898,000,000   1,504,000,000   191,000,000            
Total assets 46,293,000,000   44,477,000,000   2,174,000,000            
Liabilities                      
Current portion of capital lease obligations 303,000,000   586,000,000   2,000,000            
Trade payable to Valero         242,000,000            
Other accounts payable         96,000,000            
Accrued expenses 598,000,000   590,000,000   31,000,000            
Taxes other than income taxes 1,287,000,000   1,026,000,000   20,000,000            
Total current liabilities 13,668,000,000   11,929,000,000   391,000,000            
Debt and capital lease obligations, less current portion 6,261,000,000   6,463,000,000   1,053,000,000            
Deferred income taxes 6,312,000,000   5,860,000,000   83,000,000            
Other long-term liabilities 1,665,000,000   2,130,000,000   112,000,000            
Total liabilities         1,639,000,000            
Separation of Retail Business (Textual)                      
Spinoff transaction, ownership percentage by Valero stockholders         80.00%            
Cash distributed to Valero by CST Brands, Inc. 500,000,000 0     1,050,000,000         500,000,000 546,000,000
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        
Cash held and retained by CST upon spin 315,000,000 0     315,000,000            
Tax liability incurred related to business separation         189,000,000            
Cost of separation in general and administrative expenses           $ 30,000,000          
Ownership percentage retained         20.00%            
Expected investment holding period         18 months