Revenue - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Disaggregation of Revenue [Line Items]
Total operating revenues	$ 1,768,801	$ 1,637,759	$ 4,029,507	$ 3,704,417
Regulatory cost recovery revenue	13,000	3,000	28,000	36,000
Electric and Transmission Service
Disaggregation of Revenue [Line Items]
Total operating revenues	$ 1,756,000	$ 1,635,000	$ 4,002,000	$ 3,668,000