Revenue - Additional Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Disaggregation of Revenue [Line Items]
Operating revenues	$ 4,695,991	$ 4,324,385	$ 3,803,835
Regulatory cost recovery revenue	45,000	22,000	44,000
Electric and Transmission Service
Disaggregation of Revenue [Line Items]
Operating revenues	$ 4,651,000	$ 4,302,000	$ 3,760,000