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Separation of Retail Business (Details) (Subsequent Event [Member], Spinoff [Member], USD $) In Millions, unless otherwise specified	0 Months Ended		0 Months Ended
	May 01, 2013	Apr. 16, 2013	May 01, 2013 Change in Vendor Payment Terms [Member]	May 01, 2013 Notes Payable to Banks [Member]	Apr. 16, 2013 Sourced From Parent's Short-Term Borrowings [Member] Notes Payable to Banks [Member]	May 01, 2013 Sourced From Entity Spunoff [Member]
Separation of Retail Business (Textual)
Spinoff transaction, ownership percentage by Valero stockholders	80.00%
Cash received related to business separation	$ 1,050					$ 500
Borrowings from short-term debt agreement					550
Senior unsecured bonds of CST issued to us		550
CST bonds exchanged in settlement of short-term borrowings				550
Cash retained by CST	315		265
Tax liability incurred related to business separation	$ 220
Ownership percentage retained	20.00%
Expected investment holding period	18 months