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Commitments and Contingencies (Schedule of Long Term Purchase Commitments) (Detail)
$ in Millions
Dec. 31, 2023
USD ($)
[1]
Long-term Purchase Commitment [Line Items]  
2024 $ 62
2025 62
2026 64
2027 64
2028 64
Thereafter 412
Total $ 728
[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 $58 million and $61 million for the years ended December 31, 2023 and 2022, respectively.