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Commitments and Contingencies (Schedule of Long-Term Purchase Agreements) (Detail)
$ in Millions
Dec. 31, 2023
USD ($)
[1],[2]
Commitments and Contingencies Disclosure [Abstract]  
Purchased electric capacity, 2024 $ 77
Purchased electric capacity, 2025 77
Purchased electric capacity, 2026 80
Purchased electric capacity, 2027 81
Purchased electric capacity, 2028 81
Purchased electric capacity, Thereafter 517
Purchased electric capacity, Total $ 913
[1] Commitments represent estimated amounts payable for energy under power purchase contracts with qualifying facilities which expire at various dates through 2040. Energy payments are generally based on fixed dollar amounts per month and totaled $70 million in 2023, $75 million in 2022 and $73 million in 2021.
[2] Includes affiliated amounts with certain solar facilities of $185 million.