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Commitments and Contingencies - Schedule of Changes in Estimated Loss (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended | 75 Months Ended
--- | --- | --- | ---
Sep. 30, 2025 | Sep. 30, 2025 | Sep. 30, 2025
Loss contingency accrual roll forward |  |  |
Balance at December 31, 2024 |  | $ 1,001 |
Increase in accrued estimated losses |  | 321 |
Amounts paid | $ (483) | (768) | $ (10,786)
Balance at September 30, 2025 | 554 | 554 | 554
2017/2018 Wildfire/Mudslide Events |  |  |
Loss contingency accrual roll forward |  |  |
Balance at December 31, 2024 |  | 426 |
Increase in accrued estimated losses |  | 0 |
Amounts paid | (50) | (208) | (9,662)
Balance at September 30, 2025 | 218 | 218 | 218
Other Wildfire Events |  |  |
Loss contingency accrual roll forward |  |  |
Balance at December 31, 2024 |  | 575 |
Increase in accrued estimated losses |  | 21 |
Amounts paid | (208) | (335) | (899)
Balance at September 30, 2025 | 261 | 261 | 261
Eaton Fire |  |  |
Loss contingency accrual roll forward |  |  |
Balance at December 31, 2024 |  | 0 |
Increase in accrued estimated losses |  | 300 |
Amounts paid | (225) | (225) | (225)
Balance at September 30, 2025 | $ 75 | $ 75 | $ 75

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- Definition Amount of cash outflow reducing loss contingency liability. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 450 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147483076/450-20-50-1 + Details
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- Definition Amount charged against operating income increasing loss contingency liability, after adjustments to reduce previously estimated charges. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 450 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147483076/450-20-50-1 + Details
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