Pension Plans | Other Postretirement Benefit Plans | ||||||||||||||
December 31, | December 31, | ||||||||||||||
2013 | 2012 | 2013 | 2012 | ||||||||||||
Changes in benefit obligation: | |||||||||||||||
Benefit obligation as of beginning of year | $ | 2,307 | $ | 1,881 | $ | 436 | $ | 438 | |||||||
Service cost | 137 | 140 | 12 | 12 | |||||||||||
Interest cost | 86 | 93 | 18 | 21 | |||||||||||
Participant contributions | — | — | 15 | 14 | |||||||||||
Plan amendments | (274 | ) | 9 | (43 | ) | — | |||||||||
Curtailment gain | (6 | ) | (16 | ) | — | — | |||||||||
Benefits paid | (170 | ) | (90 | ) | (37 | ) | (35 | ) | |||||||
Actuarial (gain) loss | (169 | ) | 289 | (77 | ) | (17 | ) | ||||||||
Other | 3 | 1 | — | 3 | |||||||||||
Benefit obligation as of end of year | $ | 1,914 | $ | 2,307 | $ | 324 | $ | 436 | |||||||
Changes in plan assets(a): | |||||||||||||||
Fair value of plan assets as of beginning of year | $ | 1,729 | $ | 1,487 | $ | — | $ | — | |||||||
Actual return on plan assets | 306 | 167 | — | — | |||||||||||
Valero contributions | 41 | 164 | 19 | 19 | |||||||||||
Participant contributions | — | — | 15 | 14 | |||||||||||
Benefits paid | (170 | ) | (90 | ) | (37 | ) | (35 | ) | |||||||
Other | 3 | 1 | 3 | 2 | |||||||||||
Fair value of plan assets as of end of year | $ | 1,909 | $ | 1,729 | $ | — | $ | — | |||||||
Reconciliation of funded status(a): | |||||||||||||||
Fair value of plan assets as of end of year | $ | 1,909 | $ | 1,729 | $ | — | $ | — | |||||||
Less benefit obligation as of end of year | 1,914 | 2,307 | 324 | 436 | |||||||||||
Funded status as of end of year | $ | (5 | ) | $ | (578 | ) | $ | (324 | ) | $ | (436 | ) | |||
Accumulated benefit obligation | $ | 1,811 | $ | 1,857 | 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 20 for the assets associated with certain U.S. nonqualified pension plans. |