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Segment Information (Details) (USD $) | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Dec. 31, 2012 | Sep. 30, 2012 | Jun. 30, 2012 | Mar. 31, 2012 | Dec. 31, 2011 | Sep. 30, 2011 | Jun. 30, 2011 | Mar. 31, 2011 | Dec. 31, 2012 segments | Dec. 31, 2011 | Dec. 31, 2010 | Nov. 30, 2010
Segment information for our three reportable segments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating revenues | $ 34,695,000,000 | $ 34,726,000,000 | $ 34,662,000,000 | $ 35,167,000,000 | [1] | $ 34,673,000,000 | [2] | $ 33,713,000,000 | [3] | $ 31,293,000,000 | $ 26,308,000,000 | $ 139,250,000,000 | $ 125,987,000,000 | $ 82,233,000,000 |
Intersegment revenues |  |  |  |  |  |  |  |  |  |  |  | 9,061,000,000 | 8,810,000,000 | 6,661,000,000 |
Depreciation and amortization expense |  |  |  |  |  |  |  |  |  |  |  | 1,574,000,000 | 1,534,000,000 | 1,405,000,000 |
Operating income (loss) | 1,584,000,000 | 1,309,000,000 | 1,361,000,000 | (244,000,000) | [1] | 167,000,000 | [2] | 1,979,000,000 | [3] | 1,290,000,000 | 244,000,000 | 4,010,000,000 | 3,680,000,000 | 1,876,000,000 |
Total expenditures for long-lived assets |  |  |  |  |  |  |  |  |  |  |  | 3,413,000,000 | 2,987,000,000 | 2,234,000,000 |
Segment Information (Textual) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of reportable segments |  |  |  |  |  |  |  |  |  |  |  | 3 |  |  |
Equity method investment, ownership percentage |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 50.00%
Refining [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment information for our three reportable segments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating revenues |  |  |  |  |  |  |  |  |  |  |  | 122,925,000,000 | 109,138,000,000 | 69,854,000,000 |
Intersegment revenues |  |  |  |  |  |  |  |  |  |  |  | 8,946,000,000 | 8,665,000,000 | 6,416,000,000 |
Depreciation and amortization expense |  |  |  |  |  |  |  |  |  |  |  | 1,370,000,000 | 1,338,000,000 | 1,210,000,000 |
Operating income (loss) |  |  |  |  |  |  |  |  |  |  |  | 4,450,000,000 | 3,516,000,000 | 1,903,000,000 |
Total expenditures for long-lived assets |  |  |  |  |  |  |  |  |  |  |  | 3,147,000,000 | 2,708,000,000 | 2,084,000,000 |
Retail [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment information for our three reportable segments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating revenues |  |  |  |  |  |  |  |  |  |  |  | 12,008,000,000 | 11,699,000,000 | 9,339,000,000 |
Intersegment revenues |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 0 |
Depreciation and amortization expense |  |  |  |  |  |  |  |  |  |  |  | 119,000,000 | 115,000,000 | 108,000,000 |
Operating income (loss) |  |  |  |  |  |  |  |  |  |  |  | 348,000,000 | 381,000,000 | 346,000,000 |
Total expenditures for long-lived assets |  |  |  |  |  |  |  |  |  |  |  | 164,000,000 | 134,000,000 | 102,000,000 |
Ethanol [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment information for our three reportable segments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating revenues |  |  |  |  |  |  |  |  |  |  |  | 4,317,000,000 | 5,150,000,000 | 3,040,000,000 |
Intersegment revenues |  |  |  |  |  |  |  |  |  |  |  | 115,000,000 | 145,000,000 | 245,000,000 |
Depreciation and amortization expense |  |  |  |  |  |  |  |  |  |  |  | 42,000,000 | 39,000,000 | 36,000,000 |
Operating income (loss) |  |  |  |  |  |  |  |  |  |  |  | (47,000,000) | 396,000,000 | 209,000,000 |
Total expenditures for long-lived assets |  |  |  |  |  |  |  |  |  |  |  | 36,000,000 | 32,000,000 | 0 |
Corporate [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment information for our three reportable segments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating revenues |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 0 |
Intersegment revenues |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 0 |
Depreciation and amortization expense |  |  |  |  |  |  |  |  |  |  |  | 43,000,000 | 42,000,000 | 51,000,000 |
Operating income (loss) |  |  |  |  |  |  |  |  |  |  |  | (741,000,000) | (613,000,000) | (582,000,000) |
Total expenditures for long-lived assets |  |  |  |  |  |  |  |  |  |  |  | 66,000,000 | 113,000,000 | 48,000,000 |
Scenario, Plan [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Information (Textual) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Pro rata distribution of CST common stock to Valero stockholders | 80.00% |  |  |  |  |  |  |  |  |  |  | 80.00% |  |  |
Expected proceeds from separation of retail business |  |  |  |  |  |  |  |  |  |  |  | 1,100,000,000 |  |  |
Expected tax liability related to retail separation | $ 230,000,000 |  |  |  |  |  |  |  |  |  |  | $ 230,000,000 |  |  |
Equity method investment, ownership percentage | 20.00% |  |  |  |  |  |  |  |  |  |  | 20.00% |  |  |
Expected holding period for remaining 20 percent of CST outstanding common shares |  |  |  |  |  |  |  |  |  |  |  | 18 months |  |  |
[1] | The operations of the Aruba Refinery were suspended in March 2012.
[2] | Includes the operations related to the Meraux Acquisition beginning October 1, 2011.
[3] | Includes the operations related to the Pembroke Acquisition beginning August 1, 2011.

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