Retirement and Postretirement Benefits Plans (Tables)

6 Months Ended

Jun. 30, 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 and six months ended June 30, 2021 and 2020:

	Three months ended June 30,				Six months ended June 30,
millions	2021		2020		2021		2020
Net gains related to pension settlement and curtailment(a)	$	4	$	120	$	10	$	134
Net periodic benefit costs related to pension special termination benefits (a)	$	—	$	2	$	—	$	18
Net periodic benefit costs (gains) related to pension benefits excluding settlement, curtailment and special termination benefits	$	(3)	$	13	$	(8)	$	24
Net periodic benefit costs related to postretirement benefits	$	18	$	18	$	38	$	38
Contributions to qualified and supplemental pension plans	$	5	$	11	$	152	$	102

(a) Net gains related to settlement and curtailment and costs of special termination benefits for the three and six months ended June 30, 2021 and 2020 primarily related to a separation program and the freezing of benefit accruals for Anadarko employees.