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Commitments and Contingencies (Schedule of Long Term Purchase Commitments) (Detail)
$ in Millions
Dec. 31, 2022
USD ($)
[1]
Long-term Purchase Commitment [Line Items]  
2023 $ 71
2024 70
2025 70
2026 73
2027 73
Thereafter 630
Total $ 987
[1] Commitments represent estimated amounts payable for energy under power purchase contracts with qualifying facilities which expire at various dates through 2046. Energy payments are generally based on fixed dollar amounts per month and totaled $61 million and $59 million for the years ended December 31, 2022 and 2021, respectively.