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Retirement and Postretirement Benefit Plans | 9 Months Ended
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Sep. 30, 2018
Retirement Benefits [Abstract] |
Retirement and Postretirement Benefit Plans | 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 nine months ended September 30, 2018, and 2017 (in millions):
Three months ended September 30 |  | 2018 |  | 2017
Net Periodic Benefit Costs |  | Pension Benefit |  | Postretirement Benefit |  | Pension Benefit |  | Postretirement Benefit
Service cost |  | $ | — |  |  | $ | 5 |  |  | $ | 2 |  |  | $ | 5 |
Interest cost |  | 4 |  |  | 8 |  |  | 4 |  |  | 9 |
Expected return on plan assets |  | (7 | ) |  | — |  |  | (6 | ) |  | — |
Recognized actuarial loss |  | 2 |  |  | 2 |  |  | 2 |  |  | 3 |
Additional settlement cost |  | 3 |  |  | — |  |  | — |  |  | — |
Total |  | $ | 2 |  |  | $ | 15 |  |  | $ | 2 |  |  | $ | 17 |
Nine months ended September 30 |  | 2018 |  | 2017
Net Periodic Benefit Costs |  | Pension Benefit |  | Postretirement Benefit |  | Pension Benefit |  | Postretirement Benefit
Service cost |  | $ | 4 |  |  | $ | 17 |  |  | $ | 6 |  |  | $ | 15 |
Interest cost |  | 12 |  |  | 26 |  |  | 12 |  |  | 29 |
Expected return on plan assets |  | (19 | ) |  | — |  |  | (18 | ) |  | — |
Recognized actuarial loss |  | 4 |  |  | 12 |  |  | 6 |  |  | 11 |
Additional settlement cost |  | 3 |  |  | — |  |  | — |  |  | — |
Total |  | $ | 4 |  |  | $ | 55 |  |  | $ | 6 |  |  | $ | 55 |
Occidental contributed approximately $2 million and $1 million in the three months ended September 30, 2018, and 2017, and approximately $4 million and $3 million in the nine months ended September 30, 2018, and 2017, to its defined benefit plans. During the third quarter of 2018, Occidental adopted a postretirement benefit plan design change, which replaced the previous self-insured benefit with a Medicare Advantage PPO plan for Medicare-eligible retirees. As a result of this change, the postretirement benefit obligation was remeasured as of August 31, 2018. The remeasurement resulted in a decrease to the benefit obligation of $178 million, with a corresponding offset to accumulated other comprehensive income.

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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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