Amount due from customers, clients, or other third-parties, or arising from transactions not separately disclosed, within one year of the balance sheet date (or the normal operating cycle, whichever is longer), net of allowances established for the purpose of reducing such receivables to an amount that approximates their net realizable value.

No definition available.

Separation of Retail Business (Details) (USD $)	12 Months Ended			0 Months Ended			3 Months Ended	0 Months Ended
Separation of Retail Business (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Nov. 14, 2013	May 01, 2013	Apr. 30, 2013	Jun. 30, 2013	Apr. 16, 2013	Dec. 31, 2011
Assets
Cash and temporary cash investments	$ 3,689,000,000	$ 4,292,000,000	$ 1,723,000,000						$ 1,024,000,000
Inventories	6,623,000,000us-gaap_InventoryNet	5,758,000,000us-gaap_InventoryNet
Deferred income taxes	162,000,000us-gaap_DeferredTaxAssetsNetCurrent	266,000,000us-gaap_DeferredTaxAssetsNetCurrent
Prepaid expenses and other	164,000,000	138,000,000
Total current assets	16,614,000,000us-gaap_AssetsCurrent	19,277,000,000us-gaap_AssetsCurrent
Property, plant, and equipment, at cost	35,933,000,000us-gaap_PropertyPlantAndEquipmentGross	33,933,000,000us-gaap_PropertyPlantAndEquipmentGross
Accumulated depreciation	(9,198,000,000)	(8,226,000,000)
Property, plant, and equipment, net	26,735,000,000us-gaap_PropertyPlantAndEquipmentNet	25,707,000,000us-gaap_PropertyPlantAndEquipmentNet
Deferred charges and other assets, net	2,201,000,000us-gaap_OtherAssetsNoncurrent	2,276,000,000us-gaap_OtherAssetsNoncurrent
Total assets	45,550,000,000us-gaap_Assets	47,260,000,000us-gaap_Assets
Liabilities
Current portion of capital lease obligations	606,000,000us-gaap_DebtCurrent	303,000,000us-gaap_DebtCurrent
Accrued expenses	596,000,000us-gaap_AccruedLiabilitiesCurrent	522,000,000us-gaap_AccruedLiabilitiesCurrent
Taxes other than income taxes	1,209,000,000us-gaap_SalesAndExciseTaxPayableCurrent	1,345,000,000us-gaap_SalesAndExciseTaxPayableCurrent
Total current liabilities	9,980,000,000us-gaap_LiabilitiesCurrent	13,123,000,000us-gaap_LiabilitiesCurrent
Debt and capital lease obligations, less current portion	5,780,000,000	6,261,000,000
Deferred income taxes	6,607,000,000	6,601,000,000
Other long-term liabilities	1,939,000,000us-gaap_OtherLiabilitiesNoncurrent	1,329,000,000us-gaap_OtherLiabilitiesNoncurrent
Separation of Retail Business (Textual)
Proceeds from short-term debt in anticipation of separation	0us-gaap_ProceedsFromBankDebt	550,000,000us-gaap_ProceedsFromBankDebt	0us-gaap_ProceedsFromBankDebt
Cash distributed to Valero by CST Brands, Inc.	0	500,000,000	0
Senior unsecured bonds of CST Brands, Inc. issued to us	256,000,000	117,000,000
Cash held and retained by CST Brands, Inc. upon separation	0us-gaap_CashDivestedFromDeconsolidation	315,000,000us-gaap_CashDivestedFromDeconsolidation	0us-gaap_CashDivestedFromDeconsolidation
Gain on disposition of retained interest in CST Brands, Inc.	0	325,000,000	0
Spinoff [Member]
Assets
Cash and temporary cash investments					315,000,000
Credit card receivables from Valero					44,000,000
Other receivables, net					109,000,000
Inventories					170,000,000
Deferred income taxes					14,000,000
Prepaid expenses and other					13,000,000
Total current assets					665,000,000
Property, plant, and equipment, at cost					1,891,000,000
Accumulated depreciation					(611,000,000)
Property, plant, and equipment, net					1,280,000,000
Intangible assets, net					38,000,000
Deferred charges and other assets, net					191,000,000
Total assets					2,174,000,000
Liabilities
Current portion of capital lease obligations					2,000,000
Trade payable to Valero					242,000,000
Other accounts payable					96,000,000
Accrued expenses					31,000,000
Taxes other than income taxes					20,000,000
Total current liabilities					391,000,000
Debt and capital lease obligations, less current portion					1,053,000,000
Deferred income taxes					83,000,000
Other long-term liabilities					112,000,000
Total liabilities					1,639,000,000
Separation of Retail Business (Textual)
Spinoff transaction, ownership percentage by Valero stockholders					80.00%
Aggregate proceeds received related to separation of CST Brands, Inc					1,050,000,000
Cash distributed to Valero by CST Brands, Inc.					500,000,000
Senior unsecured bonds of CST Brands, Inc. issued to us					550,000,000
Cash held and retained by CST Brands, Inc. upon separation						315,000,000
Cost of separation in general and administrative expenses							30,000,000
Retained ownership percentage disposed				20.00%
Gain on disposition of retained interest in CST Brands, Inc.				325,000,000
Spinoff [Member] \| Notes Payable to Banks [Member]
Separation of Retail Business (Textual)
Proceeds from short-term debt in anticipation of separation								550,000,000
CST Brands, Inc. securities exchanged in settlement of short-term borrowings				$ 467,000,000	$ 550,000,000