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Retirement and Postretirement Benefit Plans | 6 Months Ended
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Jun. 30, 2018
Retirement and Postretirement Benefit Plans |
Retirement and Postretirement Benefit Plans | 9. Retirement and Postretirement Benefit Plans The following tables set forth the components of the net periodic benefit costs for Occidental’s defined benefit plans for the three and six months ended June 30, 2018, and 2017 (in millions):
Three months ended June 30 |  | 2018 |  | 2017
|  | Pension |  | Postretirement |  | Pension |  | Postretirement
Net Periodic Benefit Costs |  | Benefit |  | Benefit |  | Benefit |  | Benefit
Service cost |  | $ | 2 |  | $ | 6 |  | $ | 2 |  | $ | 5
Interest cost |  |  | 4 |  |  | 9 |  |  | 4 |  |  | 10
Expected return on plan assets |  |  | (6) |  |  | — |  |  | (6) |  |  | —
Recognized actuarial loss |  |  | 1 |  |  | 6 |  |  | 2 |  |  | 4
Total |  | $ | 1 |  | $ | 21 |  | $ | 2 |  | $ | 19
Six months ended June 30 |  | 2018 |  | 2017
|  | Pension |  | Postretirement |  | Pension |  | Postretirement
Net Periodic Benefit Costs |  | Benefit |  | Benefit |  | Benefit |  | Benefit
Service cost |  | $ | 4 |  | $ | 12 |  | $ | 4 |  | $ | 10
Interest cost |  |  | 8 |  |  | 18 |  |  | 8 |  |  | 20
Expected return on plan assets |  |  | (12) |  |  | — |  |  | (12) |  |  | —
Recognized actuarial loss |  |  | 2 |  |  | 10 |  |  | 4 |  |  | 8
Total |  | $ | 2 |  | $ | 40 |  | $ | 4 |  | $ | 38
Occidental contributed approximately $1 million in each of the three months ended June 30, 2018, and 2017, and approximately $2 million in each of the six months ended June 30, 2018, and 2017, to its defined benefit plans.

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- Definition The entire disclosure for pension and other postretirement benefits. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -URI http://asc.fasb.org/topic&trid=2235017 + Details
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