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Segment Information, Geographic Information by Country for Revenue and Long-Lived Assets (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Operating revenues by geographic area |  |  |  |  |  |  |  |  |  |  |  |
Operating revenues | $ 27,859 us-gaap_RefiningAndMarketingRevenue | $ 34,408 us-gaap_RefiningAndMarketingRevenue | $ 34,914 us-gaap_RefiningAndMarketingRevenue | $ 33,663 us-gaap_RefiningAndMarketingRevenue | $ 34,429 us-gaap_RefiningAndMarketingRevenue | $ 36,137 us-gaap_RefiningAndMarketingRevenue | $ 34,034 us-gaap_RefiningAndMarketingRevenue | [1] | $ 33,474 us-gaap_RefiningAndMarketingRevenue | $ 130,844 us-gaap_RefiningAndMarketingRevenue | $ 138,074 us-gaap_RefiningAndMarketingRevenue | $ 138,393 us-gaap_RefiningAndMarketingRevenue
Geographic information by country for long-lived assets |  |  |  |  |  |  |  |  |  |  |  |
Long-lived assets | 28,247 us-gaap_NoncurrentAssets |  |  |  | 27,059 us-gaap_NoncurrentAssets |  |  |  |  | 28,247 us-gaap_NoncurrentAssets | 27,059 us-gaap_NoncurrentAssets |
U.S. [Member] |  |  |  |  |  |  |  |  |  |  |  |
Operating revenues by geographic area |  |  |  |  |  |  |  |  |  |  |  |
Operating revenues |  |  |  |  |  |  |  |  |  | 91,499 us-gaap_RefiningAndMarketingRevenue / us-gaap_StatementGeographicalAxis = country_US | 100,418 us-gaap_RefiningAndMarketingRevenue / us-gaap_StatementGeographicalAxis = country_US | 99,879 us-gaap_RefiningAndMarketingRevenue / us-gaap_StatementGeographicalAxis = country_US
Geographic information by country for long-lived assets |  |  |  |  |  |  |  |  |  |  |  |
Long-lived assets | 24,710 us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = country_US |  |  |  | 23,572 us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = country_US |  |  |  |  | 24,710 us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = country_US | 23,572 us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = country_US |
Canada [Member] |  |  |  |  |  |  |  |  |  |  |  |
Operating revenues by geographic area |  |  |  |  |  |  |  |  |  |  |  |
Operating revenues |  |  |  |  |  |  |  |  |  | 10,410 us-gaap_RefiningAndMarketingRevenue / us-gaap_StatementGeographicalAxis = country_CA | 9,974 us-gaap_RefiningAndMarketingRevenue / us-gaap_StatementGeographicalAxis = country_CA | 10,376 us-gaap_RefiningAndMarketingRevenue / us-gaap_StatementGeographicalAxis = country_CA
Geographic information by country for long-lived assets |  |  |  |  |  |  |  |  |  |  |  |
Long-lived assets | 2,250 us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = country_CA |  |  |  | 2,260 us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = country_CA |  |  |  |  | 2,250 us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = country_CA | 2,260 us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = country_CA |
U. K. and Ireland [Member] |  |  |  |  |  |  |  |  |  |  |  |
Operating revenues by geographic area |  |  |  |  |  |  |  |  |  |  |  |
Operating revenues |  |  |  |  |  |  |  |  |  | 14,182 us-gaap_RefiningAndMarketingRevenue / us-gaap_StatementGeographicalAxis = vlo_UnitedKingdomandIrelandMember | 13,675 us-gaap_RefiningAndMarketingRevenue / us-gaap_StatementGeographicalAxis = vlo_UnitedKingdomandIrelandMember | 12,818 us-gaap_RefiningAndMarketingRevenue / us-gaap_StatementGeographicalAxis = vlo_UnitedKingdomandIrelandMember
U.K. [Member] |  |  |  |  |  |  |  |  |  |  |  |
Geographic information by country for long-lived assets |  |  |  |  |  |  |  |  |  |  |  |
Long-lived assets | 1,206 us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = country_GB |  |  |  | 1,148 us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = country_GB |  |  |  |  | 1,206 us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = country_GB | 1,148 us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = country_GB |
Other countries [Member] |  |  |  |  |  |  |  |  |  |  |  |
Operating revenues by geographic area |  |  |  |  |  |  |  |  |  |  |  |
Operating revenues |  |  |  |  |  |  |  |  |  | 14,753 us-gaap_RefiningAndMarketingRevenue / us-gaap_StatementGeographicalAxis = vlo_OtherCountriesMember | 14,007 us-gaap_RefiningAndMarketingRevenue / us-gaap_StatementGeographicalAxis = vlo_OtherCountriesMember | 15,320 us-gaap_RefiningAndMarketingRevenue / us-gaap_StatementGeographicalAxis = vlo_OtherCountriesMember
Aruba [Member] |  |  |  |  |  |  |  |  |  |  |  |
Geographic information by country for long-lived assets |  |  |  |  |  |  |  |  |  |  |  |
Long-lived assets | 59 us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = country_AW |  |  |  | 53 us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = country_AW |  |  |  |  | 59 us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = country_AW | 53 us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = country_AW |
Ireland [Member] |  |  |  |  |  |  |  |  |  |  |  |
Geographic information by country for long-lived assets |  |  |  |  |  |  |  |  |  |  |  |
Long-lived assets | $ 22 us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = country_IE |  |  |  | $ 26 us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = country_IE |  |  |  |  | $ 22 us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = country_IE | $ 26 us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = country_IE |
[1] | The separation of our retail business was completed on May 1, 2013.

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- Definition Long-lived assets other than financial instruments, long-term customer relationships of a financial institution, mortgage and other servicing rights, deferred policy acquisition costs, and deferred tax assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 41 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e9038-108599 + Details
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- Definition Revenue related to the downstream oil and gas activities, including the refining of crude oil, as well as the marketing and distribution of crude oil, refined petroleum products, and natural gas. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 23 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=8451039&loc=d3e62136-109447 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 24 -URI http://asc.fasb.org/extlink&oid=8451039&loc=d3e62246-109447 + Details
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