Revenue - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Disaggregation of Revenue [Line Items]
Total operating revenues	$ 1,308,994	$ 1,121,703	$ 2,260,706	$ 2,066,658
Regulatory cost recovery revenue	6,000	10,000	15,000	33,000
Electric and Transmission Service
Disaggregation of Revenue [Line Items]
Total operating revenues	$ 1,303,000	$ 1,112,000	$ 2,246,000	$ 2,034,000