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Supplemental Cash Flow Information	9 Months Ended
Supplemental Cash Flow Information	Sep. 30, 2018
Supplemental Cash Flow Elements [Abstract]
Supplemental Cash Flow Information	Supplemental Cash Flow Information Occidental paid foreign and domestic state income taxes of $838 million and $553 million during the nine months ended September 30, 2018, and 2017, respectively. Occidental received domestic tax refunds of $2 million and $756 million during the nine months ended September 30, 2018, and 2017, respectively. Interest paid totaled $298 million and $266 million during the nine months ended September 30, 2018, and 2017, respectively.