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Employee Benefit Plans (Tables) | 12 Months Ended
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Dec. 31, 2012
Compensation and Retirement Disclosure [Abstract] |
The changes in benefit obligation, the changes in fair value of plan assets, and the funded status of our pension plans and other postretirement benefit plans | The changes in benefit obligation related to all of our defined benefit plans, the changes in fair value of plan assets(a), and the funded status of our defined benefit plans as of and for the years ended December 31, 2012 and 2011 were as follows (in millions):
| Pension Plans |  | Other Postretirement Benefit Plans
| 2012 |  | 2011 |  | 2012 |  | 2011
Changes in benefit obligation: |  |  |  |  |  |  |
Benefit obligation at beginning of year | $ | 1,881 |  |  | $ | 1,626 |  |  | $ | 438 |  |  | $ | 426 |
Service cost | 140 |  |  | 104 |  |  | 12 |  |  | 11 |
Interest cost | 93 |  |  | 85 |  |  | 21 |  |  | 22 |
Participant contributions | — |  |  | — |  |  | 14 |  |  | 12 |
Plan amendments | 9 |  |  | 4 |  |  | — |  |  | — |
Curtailment gain | (16 | ) |  | — |  |  | — |  |  | — |
Benefits paid | (90 | ) |  | (117 | ) |  | (35 | ) |  | (30 | )
Actuarial (gain) loss | 289 |  |  | 179 |  |  | (17 | ) |  | (9 | )
Other | 1 |  |  | — |  |  | 3 |  |  | 6 |
Benefit obligation at end of year | $ | 2,307 |  |  | $ | 1,881 |  |  | $ | 436 |  |  | $ | 438 |
Changes in plan assets(a): |  |  |  |  |  |  |
Fair value of plan assets at beginning of year | $ | 1,487 |  |  | $ | 1,362 |  |  | $ | — |  |  | $ | — |
Actual return on plan assets | 167 |  |  | (2 | ) |  | — |  |  | — |
Valero contributions | 164 |  |  | 244 |  |  | 19 |  |  | 15 |
Participant contributions | — |  |  | — |  |  | 14 |  |  | 12 |
Benefits paid | (90 | ) |  | (117 | ) |  | (35 | ) |  | (30 | )
Other | 1 |  |  | — |  |  | 2 |  |  | 3 |
Fair value of plan assets at end of year | $ | 1,729 |  |  | $ | 1,487 |  |  | $ | — |  |  | $ | — |
Reconciliation of funded status(a): |  |  |  |  |  |  |
Fair value of plan assets at end of year | $ | 1,729 |  |  | $ | 1,487 |  |  | $ | — |  |  | $ | — |
Less benefit obligation at end of year | 2,307 |  |  | 1,881 |  |  | 436 |  |  | 438 |
Funded status at end of year | $ | (578 | ) |  | $ | (394 | ) |  | $ | (436 | ) |  | $ | (438 | )
Accumulated benefit obligation | $ | 1,857 |  |  | $ | 1,550 |  |  | n/a |  |  | n/a |
Benefit obligations in excess of fair value of plan assets | The accumulated benefit obligations for certain of our pension plans exceed the fair values of the assets of those plans. For those plans, the table below presents the total projected benefit obligation, accumulated benefit obligation, and fair value of the plan assets (in millions).
| December 31,
| 2012 |  | 2011
Projected benefit obligation | $ | 250 |  |  | $ | 244 |
Accumulated benefit obligation | 191 |  |  | 189 |
Fair value of plan assets | 31 |  |  | 40 |
Expected benefit payments | Benefit payments that we expect to pay, including amounts related to expected future services, and the anticipated Medicare subsidies that we expect to receive are as follows for the years ending December 31 (in millions):
| Pension Benefits |  | Other Postretirement Benefits
2013 | $ | 93 |  |  | $ | 21 |
2014 | 116 |  |  | 22 |
2015 | 108 |  |  | 24 |
2016 | 117 |  |  | 25 |
2017 | 129 |  |  | 26 |
2018-2022 | 840 |  |  | 143 |
Components of net periodic benefit costs | The components of net periodic benefit cost were as follows for the years ended December 31, 2012, 2011, and 2010 (in millions):
| Pension Plans |  | Other Postretirement Benefit Plans
| 2012 |  | 2011 |  | 2010 |  | 2012 |  | 2011 |  | 2010
Components of net periodic benefit cost: |  |  |  |  |  |  |  |  |  |  |
Service cost | $ | 140 |  |  | $ | 104 |  |  | $ | 88 |  |  | $ | 12 |  |  | $ | 11 |  |  | $ | 10 |
Interest cost | 93 |  |  | 85 |  |  | 83 |  |  | 21 |  |  | 22 |  |  | 26 |
Expected return on plan assets | (125 | ) |  | (112 | ) |  | (112 | ) |  | — |  |  | — |  |  | — |
Amortization of: |  |  |  |  |  |  |  |  |  |  |
Prior service cost (credit) | 3 |  |  | 2 |  |  | 3 |  |  | (23 | ) |  | (23 | ) |  | (20 | )
Net actuarial loss | 33 |  |  | 12 |  |  | 2 |  |  | 1 |  |  | 2 |  |  | 4 |
Net periodic benefit cost before special charges | 144 |  |  | 91 |  |  | 64 |  |  | 11 |  |  | 12 |  |  | 20 |
Special charges (credits) | (3 | ) |  | 4 |  |  | 8 |  |  | — |  |  | 4 |  |  | — |
Net periodic benefit cost | $ | 141 |  |  | $ | 95 |  |  | $ | 72 |  |  | $ | 11 |  |  | $ | 16 |  |  | $ | 20 |
Amounts recognized in other comprehensive income | Pre-tax amounts recognized in other comprehensive income for the years ended December 31, 2012, 2011, and 2010 were as follows (in millions):
| Pension Plans |  | Other Postretirement Benefit Plans
| 2012 |  | 2011 |  | 2010 |  | 2012 |  | 2011 |  | 2010
Net loss (gain) arising during the year: |  |  |  |  |  |  |  |  |  |  |
Net actuarial loss (gain) | $ | 245 |  |  | $ | 294 |  |  | $ | 68 |  |  | $ | (17 | ) |  | $ | (9 | ) |  | $ | (28 | )
Prior service cost (credit) | 9 |  |  | 4 |  |  | — |  |  | — |  |  | — |  |  | (31 | )
Net gain (loss) reclassified into income: |  |  |  |  |  |  |  |  |  |  |
Net actuarial loss | (33 | ) |  | (12 | ) |  | (2 | ) |  | (1 | ) |  | (2 | ) |  | (4 | )
Prior service (cost) credit | (3 | ) |  | (2 | ) |  | (3 | ) |  | 23 |  |  | 23 |  |  | 20 |
Curtailment and settlement | (12 | ) |  | (4 | ) |  | (4 | ) |  | — |  |  | — |  |  | — |
Total changes in other comprehensive (income) loss | $ | 206 |  |  | $ | 280 |  |  | $ | 59 |  |  | $ | 5 |  |  | $ | 12 |  |  | $ | (43 | )
Amounts in accumulated other comprehensive income not yet recognized | The pre-tax amounts in accumulated other comprehensive income as of December 31, 2012 and 2011 that have not yet been recognized as components of net periodic benefit cost were as follows (in millions):
| Pension Plans |  | Other Postretirement Benefit Plans
| 2012 |  | 2011 |  | 2012 |  | 2011
Prior service cost (credit) | $ | 21 |  |  | $ | 16 |  |  | $ | (81 | ) |  | $ | (103 | )
Net actuarial loss | 882 |  |  | 681 |  |  | 34 |  |  | 50 |
Total | $ | 903 |  |  | $ | 697 |  |  | $ | (47 | ) |  | $ | (53 | )
Amounts in accumulated other comprehensive income to be recognized in the next fiscal year | The following pre-tax amounts included in accumulated other comprehensive income as of December 31, 2012 are expected to be recognized as components of net periodic benefit cost during the year ending December 31, 2013 (in millions):
| Pension Plans |  | Other Postretirement Benefit Plans
Amortization of prior service cost (credit) | $ | 3 |  |  | $ | (13 | )
Amortization of net actuarial loss | 57 |  |  | — |
Total | $ | 60 |  |  | $ | (13 | )
Weighted-average assumptions used to determine the benefit obligations and net periodic benefit cost | The weighted-average assumptions used to determine the net periodic benefit cost for the years ended December 31, 2012, 2011, and 2010 were as follows:
| Pension Plans |  | Other Postretirement Benefit Plans
| 2012 |  | 2011 |  | 2010 |  | 2012 |  | 2011 |  | 2010
Discount rate | 5.08 | % |  | 5.40 | % |  | 5.80 | % |  | 4.97 | % |  | 5.22 | % |  | 5.68 | %
Expected long-term rate of return on plan assets | 7.67 | % |  | 7.69 | % |  | 7.71 | % |  | — | % |  | — | % |  | — | %
Rate of compensation increase | 3.68 | % |  | 3.56 | % |  | 4.18 | % |  | — | % |  | — | % |  | — | %
The weighted-average assumptions used to determine the benefit obligations as of December 31, 2012 and 2011 were as follows:
| Pension Plans |  | Other Postretirement Benefit Plans
| 2012 |  | 2011 |  | 2012 |  | 2011
Discount rate | 4.28 | % |  | 5.08 | % |  | 4.19 | % |  | 4.97 | %
Rate of compensation increase | 3.73 | % |  | 3.68 | % |  | — | % |  | — | %
Assumed health care cost trend rates | The assumed health care cost trend rates as of December 31, 2012 and 2011 were as follows:
| 2012 |  | 2011
Health care cost trend rate assumed for the next year | 7.32 | % |  | 7.43 | %
Rate to which the cost trend rate was assumed to decline (the ultimate trend rate) | 5.00 | % |  | 5.00 | %
Year that the rate reaches the ultimate trend rate | 2020 |  |  | 2018 |
Effect of one percentage-point change in assumed health care cost trend rates | A one percentage-point change in assumed health care cost trend rates would have the following effects on other postretirement benefits (in millions):
| 1% Increase |  | 1% Decrease
Effect on total of service and interest cost components | $ | 1 |  |  | $ | (1 | )
Effect on accumulated postretirement benefit obligation | 20 |  |  | (17 | )
Fair value of pension plan assets by level of fair value hierarchy | The tables below present the fair values of the assets of our pension plans (in millions) as of December 31, 2012 and 2011 by level of the fair value hierarchy. Assets categorized in Level 1 of the hierarchy are measured at fair value using a market approach based on quotations from national securities exchanges. Assets categorized in Level 2 of the hierarchy are measured at net asset value as a practical expedient for fair value. As previously noted, we do not fund or fully fund U.S. nonqualified and certain international pension plans that are not subject to funding requirements, and we do not fund our other postretirement benefit plans.
| Fair Value Measurements Using |  |
| Quoted Prices in Active Markets (Level 1) |  | Significant Other Observable Inputs (Level 2) |  | Significant Unobservable Inputs (Level 3) |  | Total as of December 31, 2012
Equity securities: |  |  |  |  |  |  |
U.S. companies(a) | $ | 441 |  |  | $ | — |  |  | $ | — |  |  | $ | 441 |
International companies | 135 |  |  | — |  |  | — |  |  | 135 |
Preferred stock | 2 |  |  | 1 |  |  | — |  |  | 3 |
Mutual funds: |  |  |  |  |  |  |
International growth | 127 |  |  | — |  |  | — |  |  | 127 |
Index funds(b) | 117 |  |  | — |  |  | — |  |  | 117 |
Corporate debt instruments | — |  |  | 290 |  |  | — |  |  | 290 |
Government securities: |  |  |  |  |  |  |
U.S. Treasury securities | 107 |  |  | — |  |  | — |  |  | 107 |
Other government securities | 3 |  |  | 65 |  |  | — |  |  | 68 |
Common collective trusts | — |  |  | 294 |  |  | — |  |  | 294 |
Insurance contracts | — |  |  | 17 |  |  | — |  |  | 17 |
Interest and dividends receivable | 5 |  |  | — |  |  | — |  |  | 5 |
Cash and cash equivalents | 98 |  |  | 27 |  |  | — |  |  | 125 |
Total | $ | 1,035 |  |  | $ | 694 |  |  | $ | — |  |  | $ | 1,729 |
______________________ See notes on page 102.
| Fair Value Measurements Using |  |
| Quoted Prices in Active Markets (Level 1) |  | Significant Other Observable Inputs (Level 2) |  | Significant Unobservable Inputs (Level 3) |  | Total as of December 31, 2011
Equity securities: |  |  |  |  |  |  |
Valero Energy Corporation common stock | $ | 5 |  |  | $ | — |  |  | $ | — |  |  | $ | 5 |
Other U.S. companies(a) | 375 |  |  | — |  |  | — |  |  | 375 |
International companies | 120 |  |  | — |  |  | — |  |  | 120 |
Preferred stock | 2 |  |  | — |  |  | — |  |  | 2 |
Mutual funds: |  |  |  |  |  |  |
International growth | 102 |  |  | — |  |  | — |  |  | 102 |
Index funds(b) | 63 |  |  | — |  |  | — |  |  | 63 |
Corporate debt instruments | — |  |  | 246 |  |  | — |  |  | 246 |
Government securities: |  |  |  |  |  |  |
U.S. Treasury securities | 67 |  |  | — |  |  | — |  |  | 67 |
Other government securities | — |  |  | 84 |  |  | — |  |  | 84 |
Common collective trusts | — |  |  | 247 |  |  | — |  |  | 247 |
Insurance contracts | — |  |  | 17 |  |  | — |  |  | 17 |
Interest and dividends receivable | 5 |  |  | — |  |  | — |  |  | 5 |
Cash and cash equivalents | 153 |  |  | 1 |  |  | — |  |  | 154 |
Total | $ | 892 |  |  | $ | 595 |  |  | $ | — |  |  | $ | 1,487 |

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- Definition Tabular disclosure of one or more of the entity's defined benefit pension plans or one or more other defined benefit postretirement plans, separately for pension plans and other postretirement benefit plans including the entity's schedule of fair value of plan assets for defined benefit or other postretirement plans. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 158 -Paragraph 4, 7, 16, 20, 21 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=21915506&loc=d3e2417-114920 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=21916443&loc=d3e4179-114921 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=21915506&loc=d3e1928-114920 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 132R -Paragraph 5 -Subparagraph d -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=21915506&loc=d3e2410-114920 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=21915506&loc=d3e2439-114920 Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 132R -Paragraph 5, 6, 7 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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- Definition Tabular disclosure of benefits expected to be paid by pension plans and/or other employee benefit plans in each of the next five fiscal years and in the aggregate for the five fiscal years thereafter. + 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 (f) -URI http://asc.fasb.org/extlink&oid=21915506&loc=d3e1928-114920 + Details
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