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SUPPLEMENTAL OIL AND GAS INFORMATION (UNAUDITED) - Change In Standardized Measure (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Increase (Decrease) in Standardized Measure of Discounted Future Net Cash Flows Relating to Proved Oil and Gas Reserves [Roll Forward] |  |  |
Beginning balance | $ 3,062 | $ 5,861 | $ 6,483
Discoveries and extensions, net of related future costs | 800 | 311 | 1,076
Net changes in prices and production costs | 9,573 | (4,326) | (1,510)
Accretion of discount | 551 | 750 | 813
Revisions of previous quantity estimates | 467 | (108) | 28
Timing and other | (161) | 6 | (192)
Changes in estimated future development costs | (103) | 0 | 0
Development costs incurred | 497 | 501 | 469
Sales and transfers, net of production costs | (2,801) | (746) | (1,317)
Sales of reserves in place | (1) | 0 | (1)
Purchases of reserves in place | 6,477 | 0 | 0
Net change in income taxes | (5,077) | 813 | 12
Ending balance | $ 13,284 | $ 3,062 | $ 5,861

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