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Employee Benefit Plans (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Changes in plan assets (a): |  |  |  |  |  |
Fair value of plan assets at beginning of year |  | $ 2,097 |  |  |  |
Fair value of plan assets at end of year |  | 2,428 |  | $ 2,097 |  |
Defined Benefit Plan, Amounts Recognized in Balance Sheet |  |  |  |  |  |
Accrued expenses |  | (33) |  | (32) |  |
Other long-term liabilities |  | (776) |  | (742) |  |
Employee Benefit Plans (Textual) |  |  |  |  |  |
Contributions to defined contribution plans |  | 70 |  | 67 |  | $ 65
Pension Plans [Member] |  |  |  |  |  |
Changes in benefit obligation: |  |  |  |  |  |
Benefit obligation at beginning of year |  | 2,567 | [1] | 2,365 |  |
Service cost |  | 123 |  | 111 |  | 109
Interest cost |  | 86 |  | 84 |  | 98
Participant contributions |  | 0 |  | 0 |  |
Benefits paid |  | (158) |  | (130) |  |
Actuarial (gain) loss |  | 286 |  | 171 |  |
Other |  | 22 |  | (34) |  |
Benefit obligation at end of year |  | 2,926 | [1] | 2,567 | [1] | 2,365
Changes in plan assets (a): |  |  |  |  |  |
Fair value of plan assets at beginning of year | [1] | 2,097 |  | 1,947 |  |
Actual return on plan assets | [1] | 363 |  | 165 |  |
Valero contributions | [1] | 110 |  | 141 |  |
Participant contributions | [1] | 0 |  | 0 |  |
Benefits paid | [1] | (158) |  | (130) |  |
Other | [1] | 16 |  | (26) |  |
Fair value of plan assets at end of year | [1] | 2,428 |  | 2,097 |  | 1,947
Reconciliation of funded status (a): |  |  |  |  |  |
Funded status as of end of year | [1] | (498) |  | (470) |  |
Accumulated benefit obligation |  | 2,746 |  | 2,419 |  |
Defined Benefit Plan, Amounts Recognized in Balance Sheet |  |  |  |  |  |
Deferred charges and other assets, net |  | 5 |  | 2 |  |
Accrued expenses |  | (14) |  | (13) |  |
Other long-term liabilities |  | (489) |  | (459) |  |
Amounts recognized in balance sheet for defined benefit plans |  | (498) |  | (470) |  |
Other Postretirement Benefit Plans [Member] |  |  |  |  |  |
Changes in benefit obligation: |  |  |  |  |  |
Benefit obligation at beginning of year |  | 302 | [1] | 336 |  |
Service cost |  | 6 |  | 7 |  | 8
Interest cost |  | 10 |  | 12 |  | 14
Participant contributions |  | 9 |  | 8 |  |
Benefits paid |  | (28) |  | (27) |  |
Actuarial (gain) loss |  | 6 |  | (35) |  |
Other |  | 1 |  | 1 |  |
Benefit obligation at end of year |  | 306 | [1] | 302 | [1] | 336
Changes in plan assets (a): |  |  |  |  |  |
Fair value of plan assets at beginning of year | [1] | 0 |  | 0 |  |
Actual return on plan assets | [1] | 0 |  | 0 |  |
Valero contributions | [1] | 19 |  | 18 |  |
Participant contributions | [1] | 9 |  | 8 |  |
Benefits paid | [1] | (28) |  | (27) |  |
Other | [1] | 0 |  | 1 |  |
Fair value of plan assets at end of year | [1] | 0 |  | 0 |  | $ 0
Reconciliation of funded status (a): |  |  |  |  |  |
Funded status as of end of year | [1] | (306) |  | (302) |  |
Defined Benefit Plan, Amounts Recognized in Balance Sheet |  |  |  |  |  |
Deferred charges and other assets, net |  | 0 |  | 0 |  |
Accrued expenses |  | (19) |  | (19) |  |
Other long-term liabilities |  | (287) |  | (283) |  |
Amounts recognized in balance sheet for defined benefit plans |  | $ (306) |  | $ (302) |  |
[1] | Plan assets include only the assets associated with pension plans subject to legal minimum funding standards. Plan assets associated with U.S. nonqualified pension plans are not included here because they are not protected from our creditors and therefore cannot be reflected as a reduction from our obligations under the pension plans. As a result, the reconciliation of funded status does not reflect the effect of plan assets that exist for all of our defined benefit plans. See Note 18 for the assets associated with certain U.S. nonqualified pension plans.

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- Definition Amount of actuarial present value of benefits attributed to employee service rendered, excluding assumptions about future compensation level. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Amount of increase (decrease) in plan assets of defined benefit plan from actual return (loss) determined by change in fair value of plan assets adjusted for contributions, benefit payments, and other expenses. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Amount of gain (loss) from change in actuarial assumptions which (increases) decreases benefit obligation of defined benefit plan. Assumptions include, but are not limited to, interest, mortality, employee turnover, salary, and temporary deviation from substantive plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a)(4) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Amount of asset, recognized in statement of financial position, for overfunded defined benefit pension and other postretirement plans. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=64852052&loc=d3e1731-114919 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(17)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=64852052&loc=d3e1703-114919 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(10)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(10)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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- Definition Amount of contribution received by defined benefit plan from employer which increases plan assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(5)(ii) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 6 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e2709-114920 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b)(3) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(5)(iv)(01) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Amount of payment to participant under defined benefit plan which decreases plan assets. For pension plan, payment includes, but is not limited to, pension benefits and death benefits. For other postretirement plan, payment includes, but is not limited to, prescription drug benefits, health care benefits, life insurance benefits, and legal, educational and advisory services. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 60 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6414203&loc=d3e39716-114964 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b)(5) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Amount of liability, recognized in statement of financial position, for defined benefit pension and other postretirement plans, classified as current. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=64852052&loc=d3e1731-114919 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(20)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=64852052&loc=d3e1703-114919 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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