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Equity (Details) (USD $) In Millions, except Share data, unless otherwise specified | 3 Months Ended | 6 Months Ended | 1 Months Ended | 0 Months Ended |  | 6 Months Ended
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Jun. 30, 2014 | Jun. 30, 2013 | Jun. 30, 2014 | Jun. 30, 2013 | Jul. 31, 2014 Subsequent Event [Member] | Jul. 29, 2014 Dividend Declared [Member] Subsequent Event [Member] | Jul. 29, 2014 Dividend Declared [Member] Subsequent Event [Member] | Jun. 30, 2014 Parent [Member] | Jun. 30, 2013 Parent [Member] | Jun. 30, 2014 Common Stock [Member] | Jun. 30, 2013 Common Stock [Member] | Jun. 30, 2014 Treasury Stock [Member] | Jun. 30, 2013 Treasury Stock [Member] | Jun. 30, 2014 Noncontrolling Interest [Member] | Jun. 30, 2013 Noncontrolling Interest [Member] | Jun. 30, 2014 Shares Purchased Related To Stock-Based Compensation Plans [Member] | Jun. 30, 2013 Shares Purchased Related To Stock-Based Compensation Plans [Member] | Jun. 30, 2014 Shares Purchased Related To Stock-Based Compensation Plans [Member] Parent [Member] | Jun. 30, 2013 Shares Purchased Related To Stock-Based Compensation Plans [Member] Parent [Member] | Jun. 30, 2014 Shares Purchased Related To Stock-Based Compensation Plans [Member] Treasury Stock [Member] | Jun. 30, 2013 Shares Purchased Related To Stock-Based Compensation Plans [Member] Treasury Stock [Member] | Jun. 30, 2014 Shares Purchased Under Programs [Member] | Jun. 30, 2013 Shares Purchased Under Programs [Member] | Jun. 30, 2014 Shares Purchased Under Programs [Member] Parent [Member] | Jun. 30, 2013 Shares Purchased Under Programs [Member] Parent [Member] | Jun. 30, 2014 Shares Purchased Under Programs [Member] Treasury Stock [Member] | Jun. 30, 2013 Shares Purchased Under Programs [Member] Treasury Stock [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 (loss) | 593 | 465 | 1,429 | 1,117 |  |  |  | 1,416 | 1,120 |  |  |  |  | 13 | (3) |  |  |  |  |  |  |  |  |  |  |  |
Dividends |  |  | (266) | (220) |  |  |  | (266) | (220) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock-based compensation expense |  |  | 21 | 25 |  |  |  | 21 | 25 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Tax deduction in excess of stock-based compensation expense |  |  | 31 | 27 |  |  |  | 31 | 27 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Transactions in connection with stock-based compensation plans: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock issuances |  |  | 32 | 43 |  |  |  | 32 | 43 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock repurchases |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (76) | (196) | (76) | (196) |  |  | (483) | (364) | (483) | (364) |  |
Separation of retail business |  |  | 0 | (499) |  |  |  | 0 | (499) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Contributions from noncontrolling interests |  |  | 14 | 45 |  |  |  | 0 | 0 |  |  |  |  | 14 | 45 |  |  |  |  |  |  |  |  |  |  |  |
Distributions to public unitholders of Valero Energy Partners LP |  |  | (4) | 0 |  |  |  | 0 | 0 |  |  |  |  | (4) | 0 |  |  |  |  |  |  |  |  |  |  |  |
Other comprehensive income (loss) | 149 | (61) | 76 | (48) |  |  |  | 76 | (48) |  |  |  |  | 0 | 0 |  |  |  |  |  |  |  |  |  |  |  |
Balance as of end of period | $ 20,720 | $ 18,025 | $ 20,720 | $ 18,025 |  |  |  | $ 20,211 | $ 17,920 |  |  |  |  | $ 509 | $ 105 |  |  |  |  |  |  |  |  |  |  |  |
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 | 2,000,000 | 3,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock repurchases |  |  |  |  | (2,000,000) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (1,000,000) | (5,000,000) |  |  |  |  | (7,000,000) | (8,000,000)
Common stock, shares, ending balance |  |  |  |  |  |  |  |  |  | 673,000,000 | 673,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Treasury stock, shares, ending balance | (143,579,323) |  | (143,579,323) |  |  |  |  |  |  |  |  | (144,000,000) | (131,000,000) |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity (Textual) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends payable, date declared |  |  |  |  |  | Jul. 29, 2014 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends payable, amount per share |  |  |  |  |  |  | $ 0.275 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends payable, date to be paid |  |  |  |  |  | Sep. 17, 2014 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends payable, date of record |  |  |  |  |  | Aug. 20, 2014 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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