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Employee Benefit Plans (Tables) | 12 Months Ended
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Dec. 31, 2017
Retirement Benefits [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 were as follows (in millions):
| Pension Plans |  | Other Postretirement Benefit Plans
| December 31, |  | December 31,
| 2017 |  | 2016 |  | 2017 |  | 2016
Changes in benefit obligation: |  |  |  |  |  |  |
Benefit obligation as of beginning of year | $ | 2,567 |  |  | $ | 2,365 |  |  | $ | 302 |  |  | $ | 336 |
Service cost | 123 |  |  | 111 |  |  | 6 |  |  | 7 |
Interest cost | 86 |  |  | 84 |  |  | 10 |  |  | 12 |
Participant contributions | — |  |  | — |  |  | 9 |  |  | 8 |
Benefits paid | (158 | ) |  | (130 | ) |  | (28 | ) |  | (27 | )
Actuarial (gain) loss | 286 |  |  | 171 |  |  | 6 |  |  | (35 | )
Other | 22 |  |  | (34 | ) |  | 1 |  |  | 1 |
Benefit obligation as of end of year | $ | 2,926 |  |  | $ | 2,567 |  |  | $ | 306 |  |  | $ | 302 |
Changes in plan assets (a): |  |  |  |  |  |  |
Fair value of plan assets as of beginning of year | $ | 2,097 |  |  | $ | 1,947 |  |  | $ | — |  |  | $ | — |
Actual return on plan assets | 363 |  |  | 165 |  |  | — |  |  | — |
Valero contributions | 110 |  |  | 141 |  |  | 19 |  |  | 18 |
Participant contributions | — |  |  | — |  |  | 9 |  |  | 8 |
Benefits paid | (158 | ) |  | (130 | ) |  | (28 | ) |  | (27 | )
Other | 16 |  |  | (26 | ) |  | — |  |  | 1 |
Fair value of plan assets as of end of year | $ | 2,428 |  |  | $ | 2,097 |  |  | $ | — |  |  | $ | — |
Reconciliation of funded status (a): |  |  |  |  |  |  |
Fair value of plan assets as of end of year | $ | 2,428 |  |  | $ | 2,097 |  |  | $ | — |  |  | $ | — |
Less benefit obligation as of end of year | 2,926 |  |  | 2,567 |  |  | 306 |  |  | 302 |
Funded status as of end of year | $ | (498 | ) |  | $ | (470 | ) |  | $ | (306 | ) |  | $ | (302 | )
Accumulated benefit obligation | $ | 2,746 |  |  | $ | 2,419 |  |  | n/a |  |  | n/a |
___________________________
(a) | 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.
Schedule of amounts recognized in balance sheet | Amounts recognized in our balance sheet for our pension and other postretirement benefits plans include (in millions):
| Pension Plans |  | Other Postretirement Benefit Plans
| December 31, |  | December 31,
| 2017 |  | 2016 |  | 2017 |  | 2016
Deferred charges and other assets, net | $ | 5 |  |  | $ | 2 |  |  | $ | — |  |  | $ | — |
Accrued expenses | (14 | ) |  | (13 | ) |  | (19 | ) |  | (19 | )
Other long-term liabilities | (489 | ) |  | (459 | ) |  | (287 | ) |  | (283 | )
| $ | (498 | ) |  | $ | (470 | ) |  | $ | (306 | ) |  | $ | (302 | )
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 following table presents the total projected benefit obligation, accumulated benefit obligation, and fair value of the plan assets (in millions).
| December 31,
| 2017 |  | 2016
Projected benefit obligation | $ | 2,661 |  |  | $ | 2,322 |
Accumulated benefit obligation | 2,526 |  |  | 2,210 |
Fair value of plan assets | 2,180 |  |  | 1,870 |
Expected benefit payments | Benefit payments that we expect to pay, including amounts related to expected future services that we expect to receive, are as follows for the years ending December 31 (in millions):
| Pension Benefits |  | Other Postretirement Benefits
2018 | $ | 162 |  |  | $ | 19 |
2019 | 219 |  |  | 19 |
2020 | 184 |  |  | 19 |
2021 | 180 |  |  | 19 |
2022 | 185 |  |  | 19 |
2023-2027 | 1,074 |  |  | 93 |
Components of net periodic benefit costs | The components of net periodic benefit cost (credit) related to our defined benefit plans were as follows (in millions):
| Pension Plans |  | Other Postretirement Benefit Plans
| Year Ended December 31, |  | Year Ended December 31,
| 2017 |  | 2016 |  | 2015 |  | 2017 |  | 2016 |  | 2015
Service cost | $ | 123 |  |  | $ | 111 |  |  | $ | 109 |  |  | $ | 6 |  |  | $ | 7 |  |  | $ | 8 |
Interest cost | 86 |  |  | 84 |  |  | 98 |  |  | 10 |  |  | 12 |  |  | 14 |
Expected return on plan assets | (150 | ) |  | (139 | ) |  | (133 | ) |  | — |  |  | — |  |  | — |
Amortization of: |  |  |  |  |  |  |  |  |  |  |
Net actuarial (gain) loss | 53 |  |  | 49 |  |  | 62 |  |  | (3 | ) |  | (1 | ) |  | — |
Prior service credit | (20 | ) |  | (20 | ) |  | (22 | ) |  | (16 | ) |  | (16 | ) |  | (18 | )
Special charges (credits) | 4 |  |  | (7 | ) |  | 7 |  |  | — |  |  | — |  |  | — |
Net periodic benefit cost (credit) | $ | 96 |  |  | $ | 78 |  |  | $ | 121 |  |  | $ | (3 | ) |  | $ | 2 |  |  | $ | 4 |
Pre-tax amounts recognized in other comprehensive income | Pre-tax amounts recognized in other comprehensive income (loss) were as follows (in millions):
| Pension Plans |  | Other Postretirement Benefit Plans
| Year Ended December 31, |  | Year Ended December 31,
| 2017 |  | 2016 |  | 2015 |  | 2017 |  | 2016 |  | 2015
Net gain (loss) arising during the year: |  |  |  |  |  |  |  |  |  |  |
Net actuarial gain (loss) | $ | (73 | ) |  | $ | (145 | ) |  | $ | 24 |  |  | $ | (6 | ) |  | $ | 35 |  |  | $ | 26 |
Prior service cost | (4 | ) |  | — |  |  | (22 | ) |  | — |  |  | — |  |  | — |
Net (gain) loss reclassified into income: |  |  |  |  |  |  |  |  |  |  |
Net actuarial (gain) loss | 53 |  |  | 49 |  |  | 62 |  |  | (3 | ) |  | (1 | ) |  | — |
Prior service credit | (20 | ) |  | (20 | ) |  | (22 | ) |  | (16 | ) |  | (16 | ) |  | (18 | )
Curtailment and settlement loss | 4 |  |  | — |  |  | 7 |  |  | — |  |  | — |  |  | — |
Total changes in other comprehensive income (loss) | $ | (40 | ) |  | $ | (116 | ) |  | $ | 49 |  |  | $ | (25 | ) |  | $ | 18 |  |  | $ | 8 |
Pre-tax amounts in accumulated other comprehensive income not yet recognized | The pre-tax amounts in accumulated other comprehensive loss that have not yet been recognized as components of net periodic benefit cost (credit) were as follows (in millions):
| Pension Plans |  | Other Postretirement Benefit Plans
| December 31, |  | December 31,
| 2017 |  | 2016 |  | 2017 |  | 2016
Net actuarial (gain) loss | $ | 894 |  |  | $ | 878 |  |  | $ | (57 | ) |  | $ | (66 | )
Prior service credit | (121 | ) |  | (145 | ) |  | (42 | ) |  | (58 | )
Total | $ | 773 |  |  | $ | 733 |  |  | $ | (99 | ) |  | $ | (124 | )
Pre-tax amounts in accumulated other comprehensive income to be recognized in the next fiscal year | The following pre-tax amounts included in accumulated other comprehensive loss as of December 31, 2017 are expected to be recognized as components of net periodic benefit cost (credit) during the year ending December 31, 2018 (in millions):
| Pension Plans |  | Other Postretirement Benefit Plans
Amortization of net actuarial (gain) loss | $ | 66 |  |  | $ | (2 | )
Amortization of prior service credit | (19 | ) |  | (11 | )
Total | $ | 47 |  |  | $ | (13 | )
Weighted-average assumptions used to determine the benefit obligations and net periodic benefit cost | The weighted-average assumptions used to determine the benefit obligations were as follows:
| Pension Plans |  | Other Postretirement Benefit Plans
| December 31, |  | December 31,
| 2017 |  | 2016 |  | 2017 |  | 2016
Discount rate | 3.58 | % |  | 4.08 | % |  | 3.72 | % |  | 4.26 | %
Rate of compensation increase | 3.86 | % |  | 3.81 | % |  | n/a |  |  | n/a |
The weighted-average assumptions used to determine the net periodic benefit cost were as follows:
| Pension Plans |  | Other Postretirement Benefit Plans
| Year Ended December 31, |  | Year Ended December 31,
| 2017 |  | 2016 |  | 2015 |  | 2017 |  | 2016 |  | 2015
Discount rate | 4.08 | % |  | 4.45 | % |  | 4.10 | % |  | 4.26 | % |  | 4.53 | % |  | 4.13 | %
Expected long-term rate of return on plan assets | 7.29 | % |  | 7.28 | % |  | 7.29 | % |  | n/a |  |  | n/a |  |  | n/a |
Rate of compensation increase | 3.81 | % |  | 3.79 | % |  | 3.78 | % |  | n/a |  |  | n/a |  |  | n/a |
Assumed health care cost trend rates | The assumed health care cost trend rates were as follows:
| December 31,
| 2017 |  | 2016
Health care cost trend rate assumed for the next year | 7.30 | % |  | 7.28 | %
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 | 2026 |  |  | 2026 |
Fair value of pension plan assets by level of fair value hierarchy | The following tables present the fair values of the assets of our pension plans (in millions) as of December 31, 2017 and 2016 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 in a market that is not active. 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 |  | Total as of December 31, 2017
| Level 1 |  | Level 2 |  | Level 3 |
Equity securities: |  |  |  |  |  |  |
U.S. companies (a) | $ | 571 |  |  | $ | — |  |  | $ | — |  |  | $ | 571 |
International companies | 187 |  |  | 1 |  |  | — |  |  | 188 |
Preferred stock | 4 |  |  | — |  |  | — |  |  | 4 |
Mutual funds: |  |  |  |  |  |  |
International growth | 118 |  |  | — |  |  | — |  |  | 118 |
Index funds (b) | 85 |  |  | — |  |  | — |  |  | 85 |
Corporate debt instruments | — |  |  | 272 |  |  | — |  |  | 272 |
Government securities: |  |  |  |  |  |  |
U.S. Treasury securities | 45 |  |  | — |  |  | — |  |  | 45 |
Other government securities | — |  |  | 144 |  |  | — |  |  | 144 |
Common collective trusts (c) | — |  |  | 621 |  |  | — |  |  | 621 |
Pooled separate accounts | — |  |  | 192 |  |  | — |  |  | 192 |
Private funds | — |  |  | 101 |  |  | — |  |  | 101 |
Insurance contract | — |  |  | 18 |  |  | — |  |  | 18 |
Interest and dividends receivable | 5 |  |  | — |  |  | — |  |  | 5 |
Cash and cash equivalents | 85 |  |  | 1 |  |  | — |  |  | 86 |
Securities transactions payable, net | (22 | ) |  | — |  |  | — |  |  | (22 | )
Total pension assets | $ | 1,078 |  |  | $ | 1,350 |  |  | $ | — |  |  | $ | 2,428 |
___________________________ See notes on page 109.
| Fair Value Measurements Using |  | Total as of December 31, 2016
| Level 1 |  | Level 2 |  | Level 3 |
Equity securities: |  |  |  |  |  |  |
U.S. companies (a) | $ | 562 |  |  | $ | — |  |  | $ | — |  |  | $ | 562 |
International companies | 164 |  |  | — |  |  | — |  |  | 164 |
Preferred stock | 3 |  |  | — |  |  | — |  |  | 3 |
Mutual funds: |  |  |  |  |  |  |
International growth | 90 |  |  | — |  |  | — |  |  | 90 |
Index funds (b) | 230 |  |  | — |  |  | — |  |  | 230 |
Corporate debt instruments | — |  |  | 280 |  |  | — |  |  | 280 |
Government securities: |  |  |  |  |  |  |
U.S. Treasury securities | 52 |  |  | — |  |  | — |  |  | 52 |
Other government securities | — |  |  | 158 |  |  | — |  |  | 158 |
Common collective trusts (c) | — |  |  | 434 |  |  | — |  |  | 434 |
Private funds | — |  |  | 76 |  |  | — |  |  | 76 |
Insurance contract | — |  |  | 18 |  |  | — |  |  | 18 |
Interest and dividends receivable | 5 |  |  | — |  |  | — |  |  | 5 |
Cash and cash equivalents | 56 |  |  | 16 |  |  | — |  |  | 72 |
Securities transactions payable, net | (47 | ) |  | — |  |  | — |  |  | (47 | )
Total pension assets | $ | 1,115 |  |  | $ | 982 |  |  | $ | — |  |  | $ | 2,097 |
__________________________________
(a) | Equity securities are held in a wide range of industrial sectors, including consumer goods, information technology, healthcare, industrials, and financial services.
(b) | This class includes primarily investments in approximately 70 percent equities and 30 percent bonds as of December 31, 2017. As of December 31, 2016, the class included primarily investments in approximately 50 percent equities and 50 percent bonds.
(c) | This class includes primarily investments in approximately 80 percent equities and 20 percent bonds as of December 31, 2017. As of December 31, 2016, the class included primarily investments in approximately 90 percent equities and 10 percent bonds.

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