INVESTMENTS AND RELATED-PARTY TRANSACTIONS (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Equity Method Investments
Equity method investment amounts	$ 6,389	$ 1,680	$ 1,515
Equity investments dividends paid	422	329	297
Excess of investments in equity investees over the underlying equity in net assets	3,600
Excess of investments in equity investees over the underlying equity in net assets, which represents goodwill	1,500
Equity-method investments financial information summarized by Income Statement line item
Revenues and other income	26,520	28,091	13,843
Costs and expenses	24,084	25,029	12,230
Net income	2,436	3,062	1,613
Equity-method investments financial information summarized by Balance Sheet line item
Current assets	1,130	5,587	5,754
Non-current assets	21,158	25,871	25,108
Current liabilities	785	4,879	4,479
Long-term debt	8,673	12,505	14,091
Other non-current liabilities	859	95	414
Stockholders’ equity	11,971	13,979	11,878
RELATED-PARTY TRANSACTIONS
Sales	691	805	636
Purchases	463	502	387
Services	28	52	38
Advances and amounts due from related parties	133	63	63
Amounts due to related parties	$ 463	$ 46	$ 45
Note payable \| WES
RELATED-PARTY TRANSACTIONS
Debt instrument interest rate stated percentage	6.50%
Anadarko Petroleum Corporation
Equity Method Investments
Equity method investment amounts	$ 2,800
Note payable	2,800
WES
Equity Method Investments
Equity method investment amounts	$ 5,128
Equity method investment ownership percentage	56.30%
OxyChem Ingleside Facility
Equity Method Investments
Equity method investment amounts	$ 679
Equity method investment ownership percentage	50.00%
Dolphin Energy Limited
Equity Method Investments
Equity method investment amounts	$ 240
Equity method investment ownership percentage	24.50%
Other
Equity Method Investments
Equity method investment amounts	$ 342
General Partner of Plains All American Pipeline, L.P
Equity Method Investments
Ownership interest (as a percent)		11.00%
RELATED-PARTY TRANSACTIONS
Sales to related party (as a percent)	87.00%	89.00%	86.00%
Plains All American Pipeline, LP
Equity Method Investments
Ownership interest (as a percent)		40.00%
Ingleside Ethylene LLC
RELATED-PARTY TRANSACTIONS
Purchases from related party (as a percent)	98.00%	98.00%

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