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Supplemental Information on Oil and Gas Operations (Unaudited) (Standardized Measure Of Discounted Future Net Cash Flows Related To Proved Reserves) (Details) - USD ($) $ in Millions | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
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Oil and Gas Disclosure [Abstract] |  |  |  |
Future cash inflows | $ 82,422 | $ 75,734 | $ 108,361 |
Future costs: |  |  |  |
Development | (6,099) | (5,241) | (5,176) |
Production | (38,326) | (31,648) | (35,264) |
Future income tax expense | (5,528) | (6,644) | (13,216) |
Future net cash flow | 32,469 | 32,201 | 54,705 |
10% discount to reflect timing of cash flows | (12,699) | (12,888) | (23,391) |
Standardized measure of discounted future net cash flows | $ 19,770 | $ 19,313 | $ 31,314 | $ 19,301

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