The profit or loss on sales of previously unissued stock by equity investees made to investors outside the consolidated group that is not reported as operating income. Represents the difference in the parent company's carrying amount of the equity interest in the subsidiary or equity investee immediately before and after the transaction.

No definition available.

Debt, Credit Facilities and Bank Debt (Details)	12 Months Ended			0 Months Ended		0 Months Ended							12 Months Ended		12 Months Ended						12 Months Ended					12 Months Ended
Debt, Credit Facilities and Bank Debt (Details)	Dec. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)	Dec. 31, 2012 USD ($)	Nov. 14, 2013 Spinoff [Member] USD ($)	May 01, 2013 Spinoff [Member] USD ($)	Nov. 14, 2013 Spinoff [Member] Notes Payable to Banks [Member] USD ($)	Oct. 24, 2013 Spinoff [Member] Notes Payable to Banks [Member] USD ($)	May 01, 2013 Spinoff [Member] Notes Payable to Banks [Member] USD ($)	Apr. 16, 2013 Spinoff [Member] Notes Payable to Banks [Member] USD ($)	Dec. 31, 2014 Other Letter of Credit [Member] USD ($)	Dec. 31, 2013 Other Letter of Credit [Member] USD ($)	Mar. 20, 2013 Credit Facilities [Member] Spinoff [Member] USD ($)	Dec. 31, 2014 Credit Facilities [Member] Letter of Credit [Member] USD ($)	Dec. 31, 2013 Credit Facilities [Member] Letter of Credit [Member] USD ($)	Dec. 31, 2014 Credit Facilities [Member] U S Revolver [Member] USD ($)	Dec. 31, 2013 Credit Facilities [Member] U S Revolver [Member] USD ($)	Dec. 31, 2012 Credit Facilities [Member] U S Revolver [Member] USD ($)	Dec. 31, 2014 Credit Facilities [Member] U S Revolver [Member] Maximum [Member]	Dec. 31, 2014 Credit Facilities [Member] U S Revolver Letter of Credit [Member] USD ($)	Dec. 31, 2013 Credit Facilities [Member] U S Revolver Letter of Credit [Member] USD ($)	Dec. 31, 2014 Credit Facilities [Member] VLP Revolver [Member] USD ($) quarter renewal	Dec. 31, 2013 Credit Facilities [Member] VLP Revolver [Member] USD ($)	Dec. 31, 2014 Credit Facilities [Member] VLP Revolver [Member] Maximum [Member]	Dec. 31, 2014 Credit Facilities [Member] VLP Revolver Letter of Credit [Member] USD ($)	Dec. 31, 2013 Credit Facilities [Member] VLP Revolver Letter of Credit [Member] USD ($)	Dec. 31, 2014 Credit Facilities [Member] Canadian Revolver [Member] CAD	Dec. 31, 2013 Credit Facilities [Member] Canadian Revolver [Member] CAD	Dec. 31, 2012 Credit Facilities [Member] Canadian Revolver [Member] CAD	Dec. 31, 2014 Credit Facilities [Member] Canadian Revolver Letter of Credit [Member] CAD	Dec. 31, 2013 Credit Facilities [Member] Canadian Revolver Letter of Credit [Member] CAD
Line of Credit Facility
Line of credit facility, maximum borrowing capacity												$ 800,000,000	$ 550,000,000		$ 3,000,000,000						$ 300,000,000					50,000,000
Line of credit facility, expiration date													Jun. 30, 2015		Nov. 30, 2018						Dec. 31, 2018					Nov. 30, 2015
Amount outstanding										80,000,000	189,000,000		56,000,000	278,000,000					54,000,000	59,000,000				0	0				10,000,000	10,000,000
Credit Facilities (Textual)
Line of credit facility, accordion feature, higher borrowing capacity option															4,500,000,000						500,000,000
Line of credit facility, duration of renewal option (in years)															1 year						1 year
Debt to capitalization ratios as per terms of revolver															0.12	0.12		0.60
Line of credit facility, number of renewal options																					2
Number of prior quarterly reporting periods used for debt to EBITDA ratio																					4
Debt to EBITDA ratio as per terms of revolver																							5.0
Borrowings from long-term lines of credit															0	0	1,100,000,000				0	0				0	0	0
Repayments of long-term lines of credit															0	0	1,100,000,000				0	0				0	0	0
Bank Debt (Textual)
Proceeds from short-term debt in anticipation of separation	0us-gaap_ProceedsFromBankDebt	550,000,000us-gaap_ProceedsFromBankDebt	0us-gaap_ProceedsFromBankDebt						550,000,000
Senior unsecured bonds of CST Brands, Inc. issued to us	256,000,000	117,000,000			550,000,000
CST Brands, Inc. securities exchanged in settlement of short-term borrowings						467,000,000		550,000,000
Proceeds from short-term debt related to disposition of retained interest	0us-gaap_ProceedsFromOtherShortTermDebt	525,000,000us-gaap_ProceedsFromOtherShortTermDebt	0us-gaap_ProceedsFromOtherShortTermDebt				525,000,000
Repayment of short-term debt related to disposition of retained interest						58,000,000
Fees paid related to disposition of retained interest	42,000,000	57,000,000	101,000,000	19,000,000
Gain on disposition of retained interest in CST Brands, Inc.	$ 0	$ 325,000,000	$ 0	$ 325,000,000