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Retirement and Postretirement Benefit Plans (Tables) | 6 Months Ended
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Jun. 30, 2019
Retirement Benefits [Abstract] |
Components of the net periodic benefit costs | 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 |

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- Definition Tabular disclosure of the components of net benefit costs for pension plans and/or other employee benefit plans including service cost, interest cost, expected return on plan assets, gain (loss), prior service cost or credit, transition asset or obligation, and gain (loss) recognized due to settlements or curtailments. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
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