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Retirement and Postretirement Benefits Plans (Tables) | 3 Months Ended
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Mar. 31, 2021
Retirement Benefits [Abstract] |
Schedule of Retirement and Postretirement Benefit Plan Costs | The following table contains a summary of Occidental's retirement and postretirement benefits plan costs for the three months ended March 31, 2021, and 2020:
|  | Three months ended March 31,
millions |  | 2021 |  | 2020
Net gains related to pension settlement and curtailment(a) |  | $ | 6 |  |  | $ | 14 |
Net periodic benefit costs related to pension special termination benefits (a) |  | $ | — |  |  | $ | 16 |
Net periodic benefit costs (gains) related to pension benefits excluding settlement, curtailment and special termination benefits |  | $ | (5) |  |  | $ | 12 |
Net periodic benefit costs related to postretirement benefits |  | $ | 20 |  |  | $ | 20 |
Contributions to qualified and supplemental pension plans |  | $ | 147 |  |  | $ | 91 |
(a) Net gains related to settlement and curtailment and costs of special termination benefits for the three months ended March 31, 2021 and 2020 primarily relate to a separation program and the freezing of benefit accruals for Anadarko employees.

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- Definition Tabular disclosure of the costs related to the various types of retirement plans including defined benefit pension plan cost, defined contribution plan cost, other postretirement benefit plan cost, and net periodic benefit cost. + 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 -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
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