Commitments and Contingencies, Purchased Power Agreements (Details) - Capacity - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Purchased Power Agreements (PPAs) [Abstract]
Payments for capacity	$ 3	$ 3	$ 2
Estimated Future Payments Under PPAs [Abstract]
Unrecorded Unconditional Purchase Obligation, to be Paid, Year One	3
Unrecorded Unconditional Purchase Obligation, to be Paid, Year Two	3
Unrecorded Unconditional Purchase Obligation, to be Paid, Year Three	3
Unrecorded Unconditional Purchase Obligation, to be Paid, Year Four	1
2028	0
Thereafter	0
Total	$ 10