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Commitments and Contingencies (Schedule of Long Term Purchase Commitments) (Detail) - Purchased electric capacity
$ in Millions
Dec. 31, 2021
USD ($)
[1]
Long-term Purchase Commitment [Line Items]  
2022 $ 66
2023 66
2024 66
2025 65
2026 68
Thereafter 681
Total $ 1,012
[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 $59 million and $52 million for the years ended December 31, 2021 and 2020, respectively.