Commitments and Contingencies - Schedule of Accrual Rollforward (Details) - USD ($) $ in Millions	3 Months Ended	69 Months Ended
	Mar. 31, 2025	Mar. 31, 2025
Loss contingency accrual roll forward
Balance at December 31, 2024	$ 1,001
Increase in accrued estimated losses	21
Amounts paid	(164)	$ (10,182)
Balance at March 31, 2025	858	858
2017/2018 Wildfire/Mudslide Events
Loss contingency accrual roll forward
Balance at December 31, 2024	426
Increase in accrued estimated losses	0
Amounts paid	(99)	(9,553)
Balance at March 31, 2025	327	327
Other Wildfire Events
Loss contingency accrual roll forward
Balance at December 31, 2024	575
Increase in accrued estimated losses	21
Amounts paid	(65)	(629)
Balance at March 31, 2025	$ 531	$ 531