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Earnings Per Common Share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2018 | Mar. 31, 2017
Less dividends paid: |  |
Weighted-average common shares outstanding (in shares) | 431 | 448
Earnings per common share – assuming dilution: |  |
Weighted-average common shares outstanding (in shares) | 431 | 448
Weighted-average common shares outstanding – assuming dilution (in shares) | 432 | 451
Common Class A [Member] |  |
Earnings per common share: |  |
Net income attributable to Valero stockholders | $ 469 | $ 305
Less dividends paid: |  |
Common stock | 344 | 314
Participating securities | 1 | 1
Undistributed earnings (excess distributions over earnings) | $ 124 | $ (10)
Weighted-average common shares outstanding (in shares) | 431 | 448
Earnings per common share: |  |
Distributed earnings (in usd per share) | $ 0.80 | $ 0.70
Undistributed earnings (excess distributions over earnings) (in usd per share) | 0.29 | (0.02)
Total earnings per common share (in usd per share) | $ 1.09 | $ 0.68
Earnings per common share – assuming dilution: |  |
Net income attributable to Valero stockholders | $ 469 | $ 305
Weighted-average common shares outstanding (in shares) | 431 | 448
Common equivalent shares (in shares) | 1 | 3
Weighted-average common shares outstanding – assuming dilution (in shares) | 432 | 451
Earnings per common share – assuming dilution (in usd per share) | $ 1.09 | $ 0.68
Participating Securities [Member] |  |
Less dividends paid: |  |
Weighted-average common shares outstanding (in shares) | 1 | 2
Earnings per common share: |  |
Distributed earnings (in usd per share) | $ 0.80 | $ 0.70
Undistributed earnings (excess distributions over earnings) (in usd per share) | 0.29 | 0.00
Total earnings per common share (in usd per share) | $ 1.09 | $ 0.70
Earnings per common share – assuming dilution: |  |
Weighted-average common shares outstanding (in shares) | 1 | 2

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- Definition Amount of paid and unpaid common stock dividends declared with the form of settlement in cash. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 + Details
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- Definition Dividends declared in the period and the contractual amount of dividends (or interest on participating income bonds) that must be paid per security. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 60A -URI http://asc.fasb.org/extlink&oid=96947427&loc=SL5780132-109256 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 60 -URI http://asc.fasb.org/extlink&oid=96947427&loc=d3e2740-109256 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 66 -URI http://asc.fasb.org/extlink&oid=96947427&loc=d3e2814-109256 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 60B -URI http://asc.fasb.org/extlink&oid=96947427&loc=SL5780133-109256 + Details
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- Definition The earnings attributable to each security on the basis that all of the earnings for the period had been distributed (to the extent that each security may share in earnings). This is the earnings amount which reflects the participation rights in undistributed earnings of each security. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 66 -URI http://asc.fasb.org/extlink&oid=96947427&loc=d3e2814-109256 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 60 -URI http://asc.fasb.org/extlink&oid=96947427&loc=d3e2740-109256 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 65 -URI http://asc.fasb.org/extlink&oid=96947427&loc=d3e2793-109256 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 60A -URI http://asc.fasb.org/extlink&oid=96947427&loc=SL5780132-109256 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 60B -URI http://asc.fasb.org/extlink&oid=96947427&loc=SL5780133-109256 + Details
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