Revenue

3 Months Ended

Mar. 31, 2021

Revenue from Contract with Customer [Abstract]

Revenue

NOTE 3 - REVENUE

Revenue from customers is recognized when obligations under the terms of a contract with our customers are satisfied; this generally occurs with the delivery of oil, natural gas liquids (NGL), gas, chemicals or services, such as transportation. As of March 31, 2021, trade receivables, net, of $3.0 billion represent rights to payment, for which Occidental has satisfied its obligations under a contract and its right to payment is conditioned only on the passage of time.

The following table shows a reconciliation of revenue from customers to total net sales for the three months ended March 31, 2021 and 2020:

	Three months ended March 31,
millions	2021		2020
Revenue from customers	$	5,184	$	5,250
All other revenues (a)	109		1,363
Net sales	$	5,293	$	6,613

(a) Includes net marketing derivatives, natural gas collars, oil collars and calls and chemical exchange contracts.

DISAGGREGATION OF REVENUE FROM CONTRACTS WITH CUSTOMERS

The table below presents Occidental's revenue from customers by segment, product and geographical area. The oil and gas segment typically sells its oil, NGL and gas at the lease or concession area. Chemical segment revenues are shown by geographic area based on the location of the sale. Excluding net marketing revenue, midstream and marketing segment revenues are shown by the location of sale.

millions	United States		International		Eliminations		Total
Three months ended March 31, 2021
Oil and gas
Oil	$	2,464	$	549	$	—	$	3,013
NGL	384		52		—		436
Gas	253		64		—		317
Other	(31)		—		—		(31)
Segment total	$	3,070	$	665	$	—	$	3,735
Chemical	$	1,037	$	50	$	—	$	1,087
Midstream and marketing
Gas processing	$	101	$	84	$	—	$	185
Marketing	438		47		—		485
Power and other	(42)		—		—		(42)
Segment total	$	497	$	131	$	—	$	628
Eliminations	$	—	$	—	$	(266)	$	(266)
Consolidated	$	4,604	$	846	$	(266)	$	5,184

millions	United States		International		Eliminations		Total
Three months ended March 31, 2020
Oil and gas
Oil	$	2,755	$	789	$	—	$	3,544
NGL	213		65		—		278
Gas	183		85		—		268
Other	11		—		—		11
Segment total	$	3,162	$	939	$	—	$	4,101
Chemical	$	910	$	51	$	—	$	961
Midstream and marketing
Gas processing	$	105	$	71	$	—	$	176
Marketing	246		(51)		—		195
Power and other	16		—		—		16
Segment total	$	367	$	20	$	—	$	387
Eliminations	$	—	$	—	$	(199)	$	(199)
Consolidated	$	4,439	$	1,010	$	(199)	$	5,250