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SUPPLEMENTAL INFORMATION ON OIL AND GAS EXPLORATION AND PRODUCTION ACTIVITIES (UNAUDITED) - Schedule of Future Costs to Settle Asset Retirement Obligations (Details) - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
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Extractive Industries [Abstract] |  |  |
Future asset retirement obligations | $ 229 | $ 222 | $ 205

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- Definition Asset Retirement Obligation, Future Cost + References No definition available. + Details
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Namespace Prefix: | gpor_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- References No definition available. + Details
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Namespace Prefix: | srt_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration