Commitment and Contingencies - Smokehouse Creek Complex (Details) $ in Millions	Sep. 30, 2025 USD ($) Claims Period	Jun. 30, 2025 complaint	Dec. 31, 2024 USD ($)
Statement of Financial Position [Abstract]
Amount of insurance coverage	$ 500
Smokehouse Creek Insurance Receivable	$ 341		$ 210
Number of complaints related to the Smokehouse Creek Complex | complaint		34
Number of claims related to the Smokehouse Creek Complex | Claims	254
Number of claims settled related to the Smokehouse Creek Complex | Period	212
Smokehouse probable loss	$ 410
Smokehouse settlements reached	361
Smokehouse remaining liability	$ 191		$ 180
Number of claims resolved related to the Smokehouse Creek Complex	12
Number of claims settled and pending dismissal related to the Smokehouse Creek Complex	9
Unsubmitted Claims related to the Smokehouse Creek Fire Complex | Claims	83
Number of unsubmitted claims settled related to the Smokehouse Creek Fire Complex | Claims	71