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Commitments and Contingencies (Schedule of Long-Term Purchase Agreements) (Detail)
$ in Millions
Dec. 31, 2022
USD ($)
[1]
Commitments And Contingencies Disclosure [Abstract]  
Purchased electric capacity, 2023 $ 87
Purchased electric capacity, 2024 86
Purchased electric capacity, 2025 87
Purchased electric capacity, 2026 91
Purchased electric capacity, 2027 92
Purchased electric capacity, Thereafter 762
Purchased electric capacity, Total $ 1,205
[1] Includes affiliated amounts with certain solar facilities of $219 million.