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Separation of Retail Business (Details) (USD $) | 6 Months Ended |  |  | 0 Months Ended | 3 Months Ended | 0 Months Ended
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Jun. 30, 2013 | Jun. 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] | 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 | $ 2,398,000,000 | $ 1,295,000,000 | $ 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 | 6,446,000,000 |  | 5,973,000,000 |  | 170,000,000 |  |  |  |  |
Deferred income taxes | 246,000,000 |  | 274,000,000 |  | 14,000,000 |  |  |  |  |
Prepaid expenses and other | 136,000,000 |  | 154,000,000 |  | 13,000,000 |  |  |  |  |
Total current assets | 16,768,000,000 |  | 16,460,000,000 |  | 665,000,000 |  |  |  |  |
Property, plant and equipment, at cost | 33,087,000,000 |  | 34,132,000,000 |  | 1,891,000,000 |  |  |  |  |
Accumulated depreciation | (7,701,000,000) |  | (7,832,000,000) |  | (611,000,000) |  |  |  |  |
Property, plant and equipment, net | 25,386,000,000 |  | 26,300,000,000 |  | 1,280,000,000 |  |  |  |  |
Intangible assets, net | 159,000,000 |  | 213,000,000 |  | 38,000,000 |  |  |  |  |
Deferred charges and other assets, net | 1,864,000,000 |  | 1,504,000,000 |  | 205,000,000 |  |  |  |  |
Total assets | 44,177,000,000 |  | 44,477,000,000 |  | 2,188,000,000 |  |  |  |  |
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 | 504,000,000 |  | 590,000,000 |  | 31,000,000 |  |  |  |  |
Taxes other than income taxes | 1,239,000,000 |  | 1,026,000,000 |  | 20,000,000 |  |  |  |  |
Total current liabilities | 12,035,000,000 |  | 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 | 6,159,000,000 |  | 5,860,000,000 |  | 83,000,000 |  |  |  |  |
Other long-term liabilities | 1,697,000,000 |  | 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 |  |  |  |  |  | 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 |  |  |  |  |

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