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Segment Information (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended |
--- | --- | ---
Mar. 31, 2015 | Mar. 31, 2014 | Dec. 31, 2014
Segment information for our reportable segments |  |  |
Operating revenues | $ 21,330 us-gaap_RefiningAndMarketingRevenue | $ 33,663 us-gaap_RefiningAndMarketingRevenue |
Operating income (loss) | 1,495 us-gaap_OperatingIncomeLoss | 1,351 us-gaap_OperatingIncomeLoss |
Total assets by reportable segment |  |  |
Reportable segment assets | 45,741 us-gaap_Assets |  | 45,550 us-gaap_Assets
Refining [Member] |  |  |
Total assets by reportable segment |  |  |
Reportable segment assets | 38,857 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = vlo_RefiningMember |  | 40,103 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = vlo_RefiningMember
Ethanol [Member] |  |  |
Total assets by reportable segment |  |  |
Reportable segment assets | 986 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = vlo_EthanolMember |  | 954 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = vlo_EthanolMember
Corporate and Other [Member] |  |  |
Total assets by reportable segment |  |  |
Reportable segment assets | 5,898 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateAndOtherMember |  | 4,493 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateAndOtherMember
Operating Segments [Member] | Refining [Member] |  |  |
Segment information for our reportable segments |  |  |
Operating revenues | 20,529 us-gaap_RefiningAndMarketingRevenue / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = vlo_RefiningMember | 32,452 us-gaap_RefiningAndMarketingRevenue / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = vlo_RefiningMember |
Operating income (loss) | 1,641 us-gaap_OperatingIncomeLoss / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = vlo_RefiningMember | 1,280 us-gaap_OperatingIncomeLoss / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = vlo_RefiningMember |
Operating Segments [Member] | Ethanol [Member] |  |  |
Segment information for our reportable segments |  |  |
Operating revenues | 801 us-gaap_RefiningAndMarketingRevenue / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = vlo_EthanolMember | 1,211 us-gaap_RefiningAndMarketingRevenue / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = vlo_EthanolMember |
Operating income (loss) | 12 us-gaap_OperatingIncomeLoss / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = vlo_EthanolMember | 243 us-gaap_OperatingIncomeLoss / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = vlo_EthanolMember |
Corporate, Non-Segment [Member] | Corporate and Other [Member] |  |  |
Segment information for our reportable segments |  |  |
Operating income (loss) | (158)us-gaap_OperatingIncomeLoss / us-gaap_ConsolidationItemsAxis = us-gaap_CorporateNonSegmentMember / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateAndOtherMember | (172)us-gaap_OperatingIncomeLoss / us-gaap_ConsolidationItemsAxis = us-gaap_CorporateNonSegmentMember / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateAndOtherMember |
Intersegment Eliminations [Member] |  |  |
Segment information for our reportable segments |  |  |
Operating revenues | 28 us-gaap_RefiningAndMarketingRevenue / us-gaap_ConsolidationItemsAxis = us-gaap_IntersegmentEliminationMember | 25 us-gaap_RefiningAndMarketingRevenue / us-gaap_ConsolidationItemsAxis = us-gaap_IntersegmentEliminationMember |
Intersegment Eliminations [Member] | Refining [Member] |  |  |
Segment information for our reportable segments |  |  |
Operating revenues | 0 us-gaap_RefiningAndMarketingRevenue / us-gaap_ConsolidationItemsAxis = us-gaap_IntersegmentEliminationMember / us-gaap_StatementBusinessSegmentsAxis = vlo_RefiningMember | 0 us-gaap_RefiningAndMarketingRevenue / us-gaap_ConsolidationItemsAxis = us-gaap_IntersegmentEliminationMember / us-gaap_StatementBusinessSegmentsAxis = vlo_RefiningMember |
Intersegment Eliminations [Member] | Ethanol [Member] |  |  |
Segment information for our reportable segments |  |  |
Operating revenues | $ 28 us-gaap_RefiningAndMarketingRevenue / us-gaap_ConsolidationItemsAxis = us-gaap_IntersegmentEliminationMember / us-gaap_StatementBusinessSegmentsAxis = vlo_EthanolMember | $ 25 us-gaap_RefiningAndMarketingRevenue / us-gaap_ConsolidationItemsAxis = us-gaap_IntersegmentEliminationMember / us-gaap_StatementBusinessSegmentsAxis = vlo_EthanolMember |

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