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Supplementary Information - Summary of Other Assets (Detail) - USD ($) $ in Millions | Dec. 31, 2024 | Dec. 31, 2023
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Segment Reporting [Abstract] |  |
Investments in APS projects | $ 2,083 | $ 2,111
Pension and other postretirement plan assets | 472 | 629
Operating lease assets | 702 | 718
Exploration data costs capitalized | 196 | 151
Fair value of hedge contracts | 14 | 65
Other | 299 | 378
Total other assets | $ 3,766 | $ 4,052

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