Debt - Department of Energy Loan Guarantee (Details)	3 Months Ended
	Mar. 31, 2024 USD ($)	Mar. 31, 2023 USD ($)	Mar. 22, 2019 USD ($)	Feb. 20, 2014 USD ($) note
Debt
Repayments of long-term debt	$ 136,047,000	$ 137,732,000
Long-term debt | Department of Energy guarantee
Debt
Aggregate borrowings including capitalized interest	4,146,807,143
Long-term debt | FFB
Debt
Number of future advance promissory notes | note				2
Maximum borrowing capacity			$ 1,619,679,706	$ 3,057,069,461
Maximum borrowing capacity designated for capitalized interest				$ 4,633,028,088
Repayments of long-term debt	$ 486,220,945
Long-term debt | FFB | Department of Energy guarantee | Services Agreement
Debt
Guarantee payment			$ 4,676,749,167