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Retirement and Postretirement Benefits Plans (Tables)
 9 Months Ended
Sep. 30, 2020
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 and nine months ended September 30, 2020 and 2019:

Three months ended September 30,Nine months ended September 30,
millions2020201920202019
Net gains related to settlement, curtailment and special termination benefits (a)
$5 $24 $121 $24 
Net periodic benefit costs related to pension benefits excluding settlement, curtailment and special termination benefits— 
(b)
15 22 19 
Net periodic benefit costs related to postretirement benefits18 19 56 48 
Contributions to qualified and supplemental plans$30 $7 $132 $8 
(a) Net gains related to settlement, curtailment and special termination benefits for the three and nine months ended September 30, 2020 and 2019 primarily relate to a separation program initiated in conjunction with the Acquisition and the freezing of benefit accruals for Anadarko employees.
(b) Net periodic benefit costs related to pension benefits excluding settlement, curtailment and special termination benefits were immaterial for the three months ended September 30, 2020.