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Retirement and Postretirement Benefit Plans | 6 Months Ended
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Jun. 30, 2019
Retirement Benefits [Abstract] |
Retirement and Postretirement Benefit Plans | Retirement and Postretirement Benefit Plans The following table sets forth the components of the net periodic benefit costs for Occidental’s defined benefit plans for the three and six months ended June 30, 2019, and 2018 (in millions):
Three months ended June 30 |  | 2019 |  | 2018
Net Periodic Benefit Costs |  | Pension Benefit |  | Postretirement Benefit |  | Pension Benefit |  | Postretirement Benefit
Service cost |  | $ | 1 |  |  | $ | 5 |  |  | $ | 2 |  |  | $ | 6 |
Interest cost |  | 3 |  |  | 10 |  |  | 4 |  |  | 9 |
Expected return on plan assets |  | (5 | ) |  | — |  |  | (6 | ) |  | — |
Recognized actuarial loss |  | 3 |  |  | 2 |  |  | 1 |  |  | 6 |
Recognized prior service cost |  | — |  |  | (2 | ) |  | — |  |  | — |
Total |  | $ | 2 |  |  | $ | 15 |  |  | $ | 1 |  |  | $ | 21 |
Six months ended June 30 |  | 2019 |  | 2018
Net Periodic Benefit Costs |  | Pension Benefit |  | Postretirement Benefit |  | Pension Benefit |  | Postretirement Benefit
Service cost |  | $ | 2 |  |  | $ | 11 |  |  | $ | 4 |  |  | $ | 12 |
Interest cost |  | 7 |  |  | 18 |  |  | 8 |  |  | 18 |
Expected return on plan assets |  | (10 | ) |  | — |  |  | (12 | ) |  | — |
Recognized actuarial loss |  | 5 |  |  | 4 |  |  | 2 |  |  | 10 |
Recognized prior service cost |  | — |  |  | (4 | ) |  | — |  |  | — |
Total |  | $ | 4 |  |  | $ | 29 |  |  | $ | 2 |  |  | $ | 40 |
Occidental contributed approximately zero and $1 million to the defined benefit pension plans in the three months ended June 30, 2019, and 2018, respectively, and approximately $1 million and $2 million in the six months ended June 30, 2019, and 2018, respectively.

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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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