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Retirement and Post-retirement Benefit Plans | 9 Months Ended
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Sep. 30, 2016
Retirement and Post-retirement Benefit Plans |
Retirement and Post-retirement Benefit Plans | 8. Retirement and Post-retirement Benefit Plans The following tables set forth the components of the net periodic benefit costs for Occidental’s defined benefit pension and post-retirement benefit plans for the three and nine months ended September 30, 2016 and 2015 (in millions):
Three months ended September 30 |  | 2016 |  | 2015
Net Periodic Benefit Costs |  | Pension Benefit |  | Post- retirement Benefit |  | Pension Benefit |  | Post- retirement Benefit |
Service cost |  | $ | 2 |  | $ | 4 |  | $ | 2 |  | $ | 7 |
Interest cost |  | 4 |  | 9 |  | 5 |  | 10 |
Expected return on plan assets |  | (6) |  | — |  | (7) |  | — |
Recognized actuarial loss |  | 3 |  | 3 |  | 3 |  | 6 |
Total |  | $ | 3 |  | $ | 16 |  | $ | 3 |  | $ | 23 |
Nine months ended September 30 |  | 2016 |  | 2015
Net Periodic Benefit Costs |  | Pension Benefit |  | Post- retirement Benefit |  | Pension Benefit |  | Post- retirement Benefit |
Service cost |  | $ | 6 |  | $ | 14 |  | $ | 6 |  | $ | 21 |
Interest cost |  | 12 |  | 29 |  | 15 |  | 30 |
Expected return on plan assets |  | (18) |  | — |  | (21) |  | — |
Recognized actuarial loss |  | 9 |  | 14 |  | 7 |  | 20 |
Settlement loss |  |  | 2 |  | — |  | — |  | — |
Total |  | $ | 11 |  | $ | 57 |  | $ | 7 |  | $ | 71 |
Occidental contributed approximately zero and $2 million in the three months ended September 30, 2016 and 2015, respectively, and approximately $2 million and $7 million in the nine months ended September 30, 2016 and 2015, respectively, to its defined benefit plans.

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