LONG-TERM DEBT - SCHEDULE (Details) - USD ($)	12 Months Ended
Dec. 31, 2019	Dec. 31, 2018
Debt Instrument [Line Items]
Long-term debt, gross	$ 37,400,000,000	$ 10,407,000,000
Unamortized discount, net		(36,000,000)
Debt issuance costs		(54,000,000)
Long-term finance leases	347,000,000
Current maturities	(51,000,000)	(116,000,000)
Total	38,537,000,000	$ 10,201,000,000
Occidental
Debt Instrument [Line Items]
Long-term debt, gross	37,401,000,000
Unamortized discount, net	914,000,000
Debt issuance costs	(125,000,000)
Long-term finance leases	347,000,000
Long-term debt	$ 38,537,000,000
4.850% senior notes due 2021 \| Senior notes \| Occidental
Debt Instrument [Line Items]
Debt instrument interest rate stated percentage	4.85%
Long-term debt, gross	$ 677,000,000
2.600% senior notes due 2021 \| Senior notes \| Occidental
Debt Instrument [Line Items]
Debt instrument interest rate stated percentage	2.60%
Long-term debt, gross	$ 1,500,000,000
4.100% senior notes due 2021 \| Senior notes
Debt Instrument [Line Items]
Debt instrument interest rate stated percentage		4.10%
Long-term debt, gross		$ 1,249,000,000
4.100% senior notes due 2021 \| Senior notes \| Occidental
Debt Instrument [Line Items]
Debt instrument interest rate stated percentage	4.10%
Long-term debt, gross	$ 1,249,000,000
Variable rate bonds due 2021, 2.854% \| Variable rate bonds \| Occidental
Debt Instrument [Line Items]
Debt instrument, variable rate	2.854%
Long-term debt, gross	$ 500,000,000
Variable rate bonds due 2021, 3.151% \| Variable rate bonds \| Occidental
Debt Instrument [Line Items]
Debt instrument, variable rate	3.151%
Long-term debt, gross	$ 500,000,000
2-year variable rate Term Loan due 2021, 3.111% \| Secured Debt \| Occidental
Debt Instrument [Line Items]
Debt instrument, variable rate	3.111%
Debt instrument, term	2 years
Long-term debt, gross	$ 1,956,000,000
2.700% senior notes due 2022 \| Senior notes \| Occidental
Debt Instrument [Line Items]
Debt instrument interest rate stated percentage	2.70%
Long-term debt, gross	$ 2,000,000,000
3.125% senior notes due 2022 \| Senior notes
Debt Instrument [Line Items]
Debt instrument interest rate stated percentage		3.125%
Long-term debt, gross		$ 813,000,000
3.125% senior notes due 2022 \| Senior notes \| Occidental
Debt Instrument [Line Items]
Debt instrument interest rate stated percentage	3.125%
Long-term debt, gross	$ 814,000,000
2.600% senior notes due 2022 \| Senior notes
Debt Instrument [Line Items]
Debt instrument interest rate stated percentage		2.60%
Long-term debt, gross		$ 400,000,000
2.600% senior notes due 2022 \| Senior notes \| Occidental
Debt Instrument [Line Items]
Debt instrument interest rate stated percentage	2.60%
Long-term debt, gross	$ 400,000,000
Variable rate bonds due 2022, 3.360% \| Variable rate bonds \| Occidental
Debt Instrument [Line Items]
Debt instrument, variable rate	3.36%
Long-term debt, gross	$ 1,500,000,000
2.700% senior notes due 2023 \| Senior notes
Debt Instrument [Line Items]
Debt instrument interest rate stated percentage		2.70%
Long-term debt, gross		$ 1,191,000,000
2.700% senior notes due 2023 \| Senior notes \| Occidental
Debt Instrument [Line Items]
Debt instrument interest rate stated percentage	2.70%
Long-term debt, gross	$ 1,191,000,000
8.750% medium-term notes due 2023 \| Medium-term notes
Debt Instrument [Line Items]
Debt instrument interest rate stated percentage		8.75%
Long-term debt, gross		$ 22,000,000
8.750% medium-term notes due 2023 \| Medium-term notes \| Occidental
Debt Instrument [Line Items]
Debt instrument interest rate stated percentage	8.75%
Long-term debt, gross	$ 22,000,000
2.900% senior notes due 2024 \| Senior notes \| Occidental
Debt Instrument [Line Items]
Debt instrument interest rate stated percentage	2.90%
Long-term debt, gross	$ 3,000,000,000
6.950% senior notes due 2024 \| Senior notes \| Occidental
Debt Instrument [Line Items]
Debt instrument interest rate stated percentage	6.95%
Long-term debt, gross	$ 650,000,000
3.450% senior notes due 2024 \| Senior notes \| Occidental
Debt Instrument [Line Items]
Debt instrument interest rate stated percentage	3.45%
Long-term debt, gross	$ 248,000,000
3.500% senior notes due 2025 \| Senior notes
Debt Instrument [Line Items]
Debt instrument interest rate stated percentage		3.50%
Long-term debt, gross		$ 750,000,000
3.500% senior notes due 2025 \| Senior notes \| Occidental
Debt Instrument [Line Items]
Debt instrument interest rate stated percentage	3.50%
Long-term debt, gross	$ 750,000,000
5.550% senior notes due 2026 \| Senior notes \| Occidental
Debt Instrument [Line Items]
Debt instrument interest rate stated percentage	5.50%
Long-term debt, gross	$ 1,100,000,000
3.200% senior notes due 2026 \| Senior notes \| Occidental
Debt Instrument [Line Items]
Debt instrument interest rate stated percentage	3.20%
Long-term debt, gross	$ 1,000,000,000
3.400% senior notes due 2026 \| Senior notes
Debt Instrument [Line Items]
Debt instrument interest rate stated percentage		3.40%
Long-term debt, gross		$ 1,150,000,000
3.400% senior notes due 2026 \| Senior notes \| Occidental
Debt Instrument [Line Items]
Debt instrument interest rate stated percentage	3.40%
Long-term debt, gross	$ 1,150,000,000
7.500% debentures due 2026 \| Debentures \| Occidental
Debt Instrument [Line Items]
Debt instrument interest rate stated percentage	7.50%
Long-term debt, gross	$ 112,000,000
3.000% senior notes due 2027 \| Senior notes
Debt Instrument [Line Items]
Debt instrument interest rate stated percentage		3.00%
Long-term debt, gross		$ 750,000,000
3.000% senior notes due 2027 \| Senior notes \| Occidental
Debt Instrument [Line Items]
Debt instrument interest rate stated percentage	3.00%
Long-term debt, gross	$ 750,000,000
7.125% debentures due 2027 \| Debentures \| Occidental
Debt Instrument [Line Items]
Debt instrument interest rate stated percentage	7.125%
Long-term debt, gross	$ 150,000,000
7.000% debentures due 2027 \| Debentures \| Occidental
Debt Instrument [Line Items]
Debt instrument interest rate stated percentage	7.00%
Long-term debt, gross	$ 48,000,000
6.625% debentures due 2028 \| Debentures \| Occidental
Debt Instrument [Line Items]
Debt instrument interest rate stated percentage	6.625%
Long-term debt, gross	$ 14,000,000
7.150% debentures due 2028 \| Debentures \| Occidental
Debt Instrument [Line Items]
Debt instrument interest rate stated percentage	7.15%
Long-term debt, gross	$ 235,000,000
7.200% senior debentures due 2028 \| Senior notes
Debt Instrument [Line Items]
Debt instrument interest rate stated percentage		7.20%
Long-term debt, gross		$ 82,000,000
7.200% senior debentures due 2028 \| Senior notes \| Occidental
Debt Instrument [Line Items]
Debt instrument interest rate stated percentage	7.20%
Long-term debt, gross	$ 82,000,000
7.200% debentures due 2029 \| Debentures \| Occidental
Debt Instrument [Line Items]
Debt instrument interest rate stated percentage	7.20%
Long-term debt, gross	$ 135,000,000
7.950% debentures due 2029 \| Debentures \| Occidental
Debt Instrument [Line Items]
Debt instrument interest rate stated percentage	7.95%
Long-term debt, gross	$ 116,000,000
8.450% senior debentures due 2029 \| Senior notes
Debt Instrument [Line Items]
Debt instrument interest rate stated percentage		8.45%
Long-term debt, gross		$ 116,000,000
8.450% senior debentures due 2029 \| Senior notes \| Occidental
Debt Instrument [Line Items]
Debt instrument interest rate stated percentage	8.45%
Long-term debt, gross	$ 116,000,000
3.500% senior notes due 2029 \| Senior notes \| Occidental
Debt Instrument [Line Items]
Debt instrument interest rate stated percentage	3.50%
Long-term debt, gross	$ 1,500,000,000
Variable rate bonds due 2030, 1.705% \| Variable rate bonds \| Occidental
Debt Instrument [Line Items]
Debt instrument, variable rate	1.705%
Long-term debt, gross	$ 68,000,000
7.500% senior notes due 2031 \| Senior notes \| Occidental
Debt Instrument [Line Items]
Debt instrument interest rate stated percentage	7.50%
Long-term debt, gross	$ 900,000,000
7.875% senior notes due 2031 \| Senior notes \| Occidental
Debt Instrument [Line Items]
Debt instrument interest rate stated percentage	7.875%
Long-term debt, gross	$ 500,000,000
6.450% senior notes due 2036 \| Senior notes \| Occidental
Debt Instrument [Line Items]
Debt instrument interest rate stated percentage	6.45%
Long-term debt, gross	$ 1,750,000,000
Zero Coupon senior notes due 2036 \| Senior notes
Debt Instrument [Line Items]
Debt instrument interest rate stated percentage	5.24%
Face value	$ 2,300,000,000
Zero Coupon senior notes due 2036 \| Senior notes \| Occidental
Debt Instrument [Line Items]
Long-term debt, gross	$ 2,271,000,000
6.500% note payable to WES due 2038 \| Note payable \| WES
Debt Instrument [Line Items]
Debt instrument interest rate stated percentage	6.50%
Long-term debt, gross	$ 260,000,000
4.300% senior notes due 2039 \| Senior notes \| Occidental
Debt Instrument [Line Items]
Debt instrument interest rate stated percentage	4.30%
Long-term debt, gross	$ 750,000,000
7.950% senior notes due 2039 \| Senior notes \| Occidental
Debt Instrument [Line Items]
Debt instrument interest rate stated percentage	7.95%
Long-term debt, gross	$ 325,000,000
6.200% senior notes due 2040 \| Senior notes \| Occidental
Debt Instrument [Line Items]
Debt instrument interest rate stated percentage	6.20%
Long-term debt, gross	$ 750,000,000
4.500% senior notes due 2044 \| Senior notes \| Occidental
Debt Instrument [Line Items]
Debt instrument interest rate stated percentage	4.50%
Long-term debt, gross	$ 625,000,000
4.625% senior notes due 2045 \| Senior notes
Debt Instrument [Line Items]
Debt instrument interest rate stated percentage		4.625%
Long-term debt, gross		$ 750,000,000
4.625% senior notes due 2045 \| Senior notes \| Occidental
Debt Instrument [Line Items]
Debt instrument interest rate stated percentage	4.625%
Long-term debt, gross	$ 750,000,000
6.600% senior notes due 2046 \| Senior notes \| Occidental
Debt Instrument [Line Items]
Debt instrument interest rate stated percentage	6.60%
Long-term debt, gross	$ 1,100,000,000
4.400% senior notes due 2046 \| Senior notes
Debt Instrument [Line Items]
Debt instrument interest rate stated percentage		4.40%
Long-term debt, gross		$ 1,200,000,000
4.400% senior notes due 2046 \| Senior notes \| Occidental
Debt Instrument [Line Items]
Debt instrument interest rate stated percentage	4.40%
Long-term debt, gross	$ 1,200,000,000
4.100% senior notes due 2047 \| Senior notes
Debt Instrument [Line Items]
Debt instrument interest rate stated percentage		4.10%
Long-term debt, gross		$ 750,000,000
4.100% senior notes due 2047 \| Senior notes \| Occidental
Debt Instrument [Line Items]
Debt instrument interest rate stated percentage	4.10%
Long-term debt, gross	$ 750,000,000
4.200% senior notes due 2048 \| Senior notes
Debt Instrument [Line Items]
Debt instrument interest rate stated percentage		4.20%
Long-term debt, gross		$ 1,000,000,000
4.200% senior notes due 2048 \| Senior notes \| Occidental
Debt Instrument [Line Items]
Debt instrument interest rate stated percentage	4.20%
Long-term debt, gross	$ 1,000,000,000
4.400% senior notes due 2049 \| Senior notes \| Occidental
Debt Instrument [Line Items]
Debt instrument interest rate stated percentage	4.40%
Long-term debt, gross	$ 750,000,000
7.730% debentures due 2096 \| Debentures \| Occidental
Debt Instrument [Line Items]
Debt instrument interest rate stated percentage	7.73%
Long-term debt, gross	$ 60,000,000
7.500% debentures due 2096 \| Debentures \| Occidental
Debt Instrument [Line Items]
Debt instrument interest rate stated percentage	7.50%
Long-term debt, gross	$ 78,000,000
7.250% debentures due 2096 \| Debentures \| Occidental
Debt Instrument [Line Items]
Debt instrument interest rate stated percentage	7.25%
Long-term debt, gross	$ 49,000,000
9.250% senior debentures due 2019 \| Senior notes
Debt Instrument [Line Items]
Debt instrument interest rate stated percentage		9.25%
Long-term debt, gross		$ 116,000,000
Variable rate bonds due 2030, 1.9% \| Variable rate bonds
Debt Instrument [Line Items]
Debt instrument, variable rate		1.90%
Long-term debt, gross		$ 68,000,000
Senior Notes due 2025 \| Senior notes
Debt Instrument [Line Items]
Debt instrument interest rate stated percentage	7.25%
Face value	$ 310,000

Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

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Amount, after accumulated amortization, of debt discount (premium).

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Amount, after accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

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