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Non Lease PPAs (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Capacity
Purchased Power Agreements (PPAs) [Abstract]
Purchased power expense		$ 77	$ 75	$ 69
Estimated Future Payments Under PPAs [Abstract]
2024		80
2025		45
2026		28
2027		9
2028		1
Thereafter		2
Total		165
Energy
Purchased Power Agreements (PPAs) [Abstract]
Purchased power expense		214	$ 182	$ 149
Estimated Future Payments Under PPAs [Abstract]
2024	[1]	207
2025	[1]	94
2026	[1]	47
2027	[1]	10
2028	[1]	10
Thereafter	[1]	18
Total	[1]	$ 386
[1] Excludes contingent energy payments for renewable energy PPAs.

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Amount of fixed and determinable portion of unrecorded unconditional purchase obligation to be paid in fourth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

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Amount of fixed and determinable portion of unrecorded unconditional purchase obligation to be paid in third fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

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Amount of the unrecorded obligation to transfer funds in the future for fixed or minimum amounts or quantities of goods or services at fixed or minimum prices (for example, as in take-or-pay contracts or throughput contracts).

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Amount of operating expense for purchased power procured under arrangements extending beyond one year or the normal operating cycle, if longer, by regulated operation.

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