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Equity (Details) (USD $) In Millions, except Share data, unless otherwise specified | 3 Months Ended | 9 Months Ended | 1 Months Ended | 0 Months Ended |  | 9 Months Ended
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Sep. 30, 2014 | Sep. 30, 2013 | Sep. 30, 2014 | Sep. 30, 2013 | Oct. 31, 2014 Subsequent Event [Member] | Oct. 23, 2014 Dividend Declared [Member] Subsequent Event [Member] | Oct. 23, 2014 Dividend Declared [Member] Subsequent Event [Member] | Sep. 30, 2014 Shares Purchased Related To Stock-Based Compensation Plans [Member] | Sep. 30, 2013 Shares Purchased Related To Stock-Based Compensation Plans [Member] | Sep. 30, 2014 Shares Purchased Under Programs [Member] | Sep. 30, 2013 Shares Purchased Under Programs [Member] | Sep. 30, 2014 Parent [Member] | Sep. 30, 2013 Parent [Member] | Sep. 30, 2014 Parent [Member] Shares Purchased Related To Stock-Based Compensation Plans [Member] | Sep. 30, 2013 Parent [Member] Shares Purchased Related To Stock-Based Compensation Plans [Member] | Sep. 30, 2014 Parent [Member] Shares Purchased Under Programs [Member] | Sep. 30, 2013 Parent [Member] Shares Purchased Under Programs [Member] | Sep. 30, 2014 Common Stock [Member] | Sep. 30, 2013 Common Stock [Member] | Sep. 30, 2014 Treasury Stock [Member] | Sep. 30, 2013 Treasury Stock [Member] | Sep. 30, 2014 Treasury Stock [Member] Shares Purchased Related To Stock-Based Compensation Plans [Member] | Sep. 30, 2013 Treasury Stock [Member] Shares Purchased Related To Stock-Based Compensation Plans [Member] | Sep. 30, 2014 Treasury Stock [Member] Shares Purchased Under Programs [Member] | Sep. 30, 2013 Treasury Stock [Member] Shares Purchased Under Programs [Member] | Sep. 30, 2014 Noncontrolling Interest [Member] | Sep. 30, 2013 Noncontrolling Interest [Member]
Reconciliation of the Beginning and Ending Balances of the Carrying Amounts of Equity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance as of beginning of period |  |  | $ 19,946 | $ 18,095 |  |  |  |  |  |  |  | $ 19,460 | $ 18,032 |  |  |  |  |  |  |  |  |  |  |  |  | $ 486 | $ 63
Net income | 1,062 | 324 | 2,491 | 1,441 |  |  |  |  |  |  |  | 2,475 | 1,432 |  |  |  |  |  |  |  |  |  |  |  |  | 16 | 9
Dividends |  |  | (411) | (342) |  |  |  |  |  |  |  | (411) | (342) |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock-based compensation expense |  |  | 30 | 31 |  |  |  |  |  |  |  | 30 | 31 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Tax deduction in excess of stock-based compensation expense |  |  | 33 | 31 |  |  |  |  |  |  |  | 33 | 31 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Transactions in connection with stock-based compensation plans: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock issuances |  |  | 37 | 47 |  |  |  |  |  |  |  | 37 | 47 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock repurchases |  |  |  |  |  |  |  | (177) | (220) | (692) | (396) |  |  | (177) | (220) | (692) | (396) |  |  |  |  |  |  |  |  |  |
Separation of retail business |  |  | 0 | (479) |  |  |  |  |  |  |  | 0 | (479) |  |  |  |  |  |  |  |  |  |  |  |  |  |
Contributions from noncontrolling interests |  |  | 14 | 45 |  |  |  |  |  |  |  | 0 | 0 |  |  |  |  |  |  |  |  |  |  |  |  | 14 | 45
Distributions to public unitholders of Valero Energy Partners LP |  |  | (8) | 0 |  |  |  |  |  |  |  | 0 | 0 |  |  |  |  |  |  |  |  |  |  |  |  | (8) | 0
Other comprehensive income (loss) | (277) | 182 | (201) | 134 |  |  |  |  |  |  |  | (201) | 134 |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0
Balance as of end of period | $ 21,062 | $ 18,387 | $ 21,062 | $ 18,387 |  |  |  |  |  |  |  | $ 20,554 | $ 18,270 |  |  |  |  |  |  |  |  |  |  |  |  | $ 508 | $ 117
Share Activity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock, shares, beginning balance |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 673,000,000 | 673,000,000 |  |  |  |  |  |  |  |
Treasury stock, shares, beginning balance |  |  | (137,932,138) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (138,000,000) | (121,000,000) |  |  |  |  |  |
Stock issuances |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 3,000,000 | 3,000,000 |  |  |  |  |  |
Stock repurchases |  |  |  |  | (1,500,000) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (2,000,000) | (5,000,000) | (13,000,000) | (9,000,000) |  |
Common stock, shares, ending balance |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 673,000,000 | 673,000,000 |  |  |  |  |  |  |  |
Treasury stock, shares, ending balance | (150,357,996) |  | (150,357,996) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (150,000,000) | (132,000,000) |  |  |  |  |  |
Equity (Textual) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends payable, date declared |  |  |  |  |  | Oct. 23, 2014 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends payable, amount per share |  |  |  |  |  |  | $ 0.275 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends payable, date to be paid |  |  |  |  |  | Dec. 17, 2014 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends payable, date of record |  |  |  |  |  | Nov. 19, 2014 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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