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INVESTMENTS AND RELATED-PARTY TRANSACTIONS (Details) - USD ($) shares in Millions, $ in Millions | 1 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Dec. 31, 2021 | Nov. 30, 2021 | Mar. 31, 2021 | Sep. 30, 2019 | Sep. 30, 2020 | Mar. 31, 2020 | Sep. 30, 2020 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Equity Method Investments |  |  |  |  |  |  |  |  |  |  |
Equity method investment amounts |  | $ 2,938 |  |  |  |  |  |  | $ 2,938 | $ 3,250 |
Dividends received as return on investment |  |  |  |  |  |  |  |  | 652 | 678 | $ 422
Cumulative undistributed earnings |  | 242 |  |  |  |  |  |  | 242 | 166 |
Excess of investments in equity investees over the underlying equity in net assets |  | 667 |  |  |  |  |  |  | 667 |  |
Excess of investments in equity investees over the underlying equity in net assets, which represents goodwill |  | 347 |  |  |  |  |  |  | 347 |  |
Equity-method investments financial information summarized by Income Statement line item |  |  |  |  |  |  |  |  |  |  |
Revenues and other income |  |  |  |  |  |  |  |  | 26,314 | 16,261 | 21,750
Costs and expenses |  |  |  |  |  |  |  |  | 23,362 | 31,913 | 22,002
Net income |  |  |  |  |  |  |  |  | 2,952 | (15,652) | (252)
Equity-method investments financial information summarized by Balance Sheet line item |  |  |  |  |  |  |  |  |  |  |
Current assets |  | 10,211 |  |  |  |  |  |  | 10,211 | 8,819 |
Current liabilities |  | 8,324 |  |  |  |  |  |  | 8,324 | 8,223 |
Long-term debt | [1] | 29,431 |  |  |  |  |  |  | 29,431 | 35,745 |
Other non-current liabilities |  | 16,954 |  |  |  |  |  |  | 16,954 | 17,523 |
Stockholders’ equity |  | 20,327 |  |  |  |  |  |  | 20,327 | 18,573 |
RELATED-PARTY TRANSACTIONS |  |  |  |  |  |  |  |  |  |  |
Sales |  |  |  |  |  |  |  |  | 261 | 301 | 691
Purchases |  |  |  |  |  |  |  |  | 773 | 1,112 | 463
Services |  |  |  |  |  |  |  |  | 942 | 1,101 | 28
Advances and amounts due from related parties (c) |  | 57 |  |  |  |  |  |  | 57 | 62 | 133
Amounts due to related parties |  | $ 280 |  |  |  |  |  |  | $ 280 | 296 | 463
Disposal Group, Disposed of by Sale, Not Discontinued Operations | WES |  |  |  |  |  |  |  |  |  |  |
Equity Method Investments |  |  |  |  |  |  |  |  |  |  |
Number of shares sold (in shares) |  | 2.5 |  | 11.5 |  |  |  |  | 14.0 |  |
Net proceeds from sale of equity investment |  | $ 50 |  | $ 200 |  |  |  |  | $ 250 |  |
Gain on sale |  |  |  | $ 102 |  |  |  |  |  |  |
Goodwill impairment loss |  |  |  |  |  |  | $ 1,200 |  |  |  |
Other-than-temporary impairment loss |  |  |  |  |  | $ 2,700 |  |  |  |  |
Equity Method Investment, Nonconsolidated Investee |  |  |  |  |  |  |  |  |  |  |
Equity Method Investments |  |  |  |  |  |  |  |  |  |  |
Equity method investment amounts |  | 2,938 |  |  |  |  |  |  | 2,938 |  |
Equity-method investments financial information summarized by Income Statement line item |  |  |  |  |  |  |  |  |  |  |
Revenues and other income |  |  |  |  |  |  |  |  | 6,252 | 5,455 | 26,520
Costs and expenses |  |  |  |  |  |  |  |  | 4,569 | 5,455 | 24,084
Net income |  |  |  |  |  |  |  |  | 1,683 | 0 | 2,436
Equity-method investments financial information summarized by Balance Sheet line item |  |  |  |  |  |  |  |  |  |  |
Current assets |  | 3,387 |  |  |  |  |  |  | 3,387 | 1,419 | 1,130
Non-current assets |  | 19,341 |  |  |  |  |  |  | 19,341 | 18,693 | 21,158
Current liabilities |  | 1,976 |  |  |  |  |  |  | 1,976 | 1,549 | 785
Long-term debt |  | 9,464 |  |  |  |  |  |  | 9,464 | 7,860 | 8,673
Other non-current liabilities |  | 1,187 |  |  |  |  |  |  | 1,187 | 866 | 859
Stockholders’ equity |  | 10,101 |  |  |  |  |  |  | 10,101 | 9,837 | 11,971
Anadarko Petroleum Corporation |  |  |  |  |  |  |  |  |  |  |
Equity Method Investments |  |  |  |  |  |  |  |  |  |  |
Equity method investment amounts |  | 2,900 |  |  |  |  |  |  | 2,900 |  |
WES |  |  |  |  |  |  |  |  |  |  |
Equity Method Investments |  |  |  |  |  |  |  |  |  |  |
Equity method investment amounts |  | 2,000 |  |  |  |  |  |  | $ 2,000 |  |
Goodwill impairment loss |  |  |  |  |  |  |  |  |  | $ 1,200 |
Other-than-temporary impairment loss |  |  |  |  |  |  |  | $ 2,700 |  |  |
RELATED-PARTY TRANSACTIONS |  |  |  |  |  |  |  |  |  |  |
Sales to related party (as a percent) |  |  |  |  |  |  |  |  | 58.00% | 70.00% |
Purchases from related party (as a percent) |  |  |  |  |  |  |  |  | 27.00% | 59.00% |
WES | Equity Method Investment, Nonconsolidated Investee |  |  |  |  |  |  |  |  |  |  |
Equity Method Investments |  |  |  |  |  |  |  |  |  |  |
Equity method investment amounts |  | $ 1,963 |  |  |  |  |  |  | $ 1,963 |  |
Equity method investment ownership percentage |  | 51.80% |  |  |  |  |  |  | 51.80% |  |
OxyChem Ingleside Facility | Equity Method Investment, Nonconsolidated Investee |  |  |  |  |  |  |  |  |  |  |
Equity Method Investments |  |  |  |  |  |  |  |  |  |  |
Equity method investment amounts |  | $ 599 |  |  |  |  |  |  | $ 599 |  |
Equity method investment ownership percentage |  | 50.00% |  |  |  |  |  |  | 50.00% |  |
OLCV - Related | Equity Method Investment, Nonconsolidated Investee |  |  |  |  |  |  |  |  |  |  |
Equity Method Investments |  |  |  |  |  |  |  |  |  |  |
Equity method investment amounts |  | $ 164 |  |  |  |  |  |  | $ 164 |  |
Other | Equity Method Investment, Nonconsolidated Investee |  |  |  |  |  |  |  |  |  |  |
Equity Method Investments |  |  |  |  |  |  |  |  |  |  |
Equity method investment amounts |  | 212 |  |  |  |  |  |  | 212 |  |
Dolphin Energy Limited |  |  |  |  |  |  |  |  |  |  |
Equity Method Investments |  |  |  |  |  |  |  |  |  |  |
Equity method investment amounts |  | $ 217 |  |  |  |  |  |  | $ 217 |  |
Equity method investment ownership percentage |  | 24.50% |  |  |  |  |  |  | 24.50% |  |
Cash distributions |  |  | $ 560 |  |  |  |  |  |  |  |
Dividends received as return on investment |  |  | 110 |  |  |  |  |  |  |  |
Excess distributions |  |  | $ 450 |  |  |  |  |  |  |  |
Carrying value of investment and excess distributions |  | $ 233 |  |  |  |  |  |  | $ 233 |  |
Plains All American Pipeline, LP |  |  |  |  |  |  |  |  |  |  |
Equity Method Investments |  |  |  |  |  |  |  |  |  |  |
Net proceeds from sale of equity investment |  |  |  |  | $ 646 |  |  |  |  |  |
Equity-method investments financial information summarized by Balance Sheet line item |  |  |  |  |  |  |  |  |  |  |
Investment gross revenue |  |  |  |  |  |  |  |  |  |  | $ 24,700
General Partner of Plains All American Pipeline, L.P |  |  |  |  |  |  |  |  |  |  |
RELATED-PARTY TRANSACTIONS |  |  |  |  |  |  |  |  |  |  |
Sales to related party (as a percent) |  |  |  |  |  |  |  |  |  |  | 87.00%
Ingleside Ethylene LLC |  |  |  |  |  |  |  |  |  |  |
RELATED-PARTY TRANSACTIONS |  |  |  |  |  |  |  |  |  |  |
Purchases from related party (as a percent) |  |  |  |  |  |  |  |  | 70.00% | 41.00% | 98.00%
[1] | Included $504 million and $316 million of finance lease liabilities as of December 31, 2021, and 2020, respectively.

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