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Disposal of Assets - Additional Information (Detail) - USD ($) $ in Millions |  |  |  | 6 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | ---
Mar. 26, 2024 | Feb. 23, 2024 | Aug. 08, 2023 | Jun. 30, 2024 | Dec. 31, 2023
Disposal of assets [line item] |  |  |  |  |
Assets held for sale |  |  |  | $ 1,378 | $ 826
Liabilities directly associated with assets held for sale |  |  |  | 119 | $ 94
Impairment of assets reclassification to held for sale |  |  |  | 0 |
JERA Scarborough Pty Ltd [Member] |  |  |  |  |
Disposal of assets [line item] |  |  |  |  |
Recognized tax benefit |  |  |  | 91 |
Scarborough [Member] |  |  |  |  |
Disposal of assets [line item] |  |  |  |  |
Proportion of ownership interest in joint venture |  |  |  |  | 10.00%
Scarborough [Member] | JERA Scarborough Pty Ltd [Member] |  |  |  |  |
Disposal of assets [line item] |  |  |  |  |
Recognized tax benefit |  |  |  | $ 91 |
Percentage of sale of interest sold |  |  |  |  | 15.10%
Proportion of ownership interest in joint venture |  |  |  | 15.10% |
Scarborough [Member] | JERA Scarborough Pty Ltd [Member] | Bottom of range [member] |  |  |  |  |
Disposal of assets [line item] |  |  |  |  |
Proportion of voting rights held in joint venture |  |  |  | 74.90% |
Scarborough [Member] | JERA Scarborough Pty Ltd [Member] | Top of range [member] |  |  |  |  |
Disposal of assets [line item] |  |  |  |  |
Proportion of voting rights held in joint venture |  |  |  | 90.00% |
Scarborough [Member] | AUSTRALIA | JERA Scarborough Pty Ltd [Member] |  |  |  |  |
Disposal of assets [line item] |  |  |  |  |
Assets held for sale |  |  |  | $ 1,378 |
Liabilities directly associated with assets held for sale |  |  |  | 119 |
Proportion of ownership interest in joint venture |  | 15.10% |  |  |
Scarborough [Member] | L And G Japan [Member] |  |  |  |  |
Disposal of assets [line item] |  |  |  |  |
Proportion of voting rights held in joint venture | 90.00% |  | 100.00% |  |
Scarborough [Member] | L And G Japan [Member] | JERA Scarborough Pty Ltd [Member] |  |  |  |  |
Disposal of assets [line item] |  |  |  |  |
Disposal group including discontinued operation consideration receivable |  |  | $ 740 |  |
Scarborough [Member] | L And G Japan [Member] | AUSTRALIA |  |  |  |  |
Disposal of assets [line item] |  |  |  |  |
Proceeds from the sale for capital reimbursements and escalation |  |  | $ 910 |  |
Percentage of sale of interest sold |  |  | 10.00% |  |
Assets held for sale |  |  |  |  | $ 823
Liabilities directly associated with assets held for sale |  |  |  |  | $ 94
Amount payable due to cost overuns maximum |  |  | $ 50 |  |
Disposal group consideration received on sale of assets |  |  |  | $ 121 |

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