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Commitments and Contingencies - SPPC (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Contractual Obligation [Line Items]      
2023 $ 6,414    
2024 3,403    
2025 1,907    
2026 1,949    
2027 1,587    
Thereafter 16,383    
Purchase obligation 31,643    
Fuel, capacity and transmission contract commitments      
Contractual Obligation [Line Items]      
2023 3,431    
2024 1,879    
2025 1,381    
2026 1,286    
2027 1,234    
Thereafter 11,862    
Purchase obligation 21,073    
Construction commitments      
Contractual Obligation [Line Items]      
2023 2,434    
2024 1,088    
2025 144    
2026 294    
2027 10    
Thereafter 0    
Purchase obligation 3,970    
Easements      
Contractual Obligation [Line Items]      
2023 88    
2024 86    
2025 85    
2026 86    
2027 87    
Thereafter 3,049    
Purchase obligation 3,481    
Maintenance, service and other contracts      
Contractual Obligation [Line Items]      
2023 461    
2024 350    
2025 297    
2026 283    
2027 256    
Thereafter 1,472    
Purchase obligation 3,119    
SPPC      
Contractual Obligation [Line Items]      
2023 930    
2024 1,003    
2025 289    
2026 419    
2027 140    
Thereafter 1,721    
Purchase obligation 4,502    
Easement expense 2 $ 2 $ 2
SPPC | Fuel, capacity and transmission contract commitments      
Contractual Obligation [Line Items]      
2023 413    
2024 244    
2025 184    
2026 134    
2027 127    
Thereafter 1,447    
Purchase obligation 2,549    
SPPC | Fuel and capacity contract commitments (not commercially operable)      
Contractual Obligation [Line Items]      
2023 8    
2024 11    
2025 12    
2026 12    
2027 11    
Thereafter 236    
Purchase obligation 290    
SPPC | Construction commitments      
Contractual Obligation [Line Items]      
2023 500    
2024 741    
2025 86    
2026 268    
2027 0    
Thereafter 0    
Purchase obligation 1,595    
SPPC | Easements      
Contractual Obligation [Line Items]      
2023 2    
2024 2    
2025 2    
2026 2    
2027 2    
Thereafter 33    
Purchase obligation 43    
SPPC | Maintenance, service and other contracts      
Contractual Obligation [Line Items]      
2023 7    
2024 5    
2025 5    
2026 3    
2027 0    
Thereafter 5    
Purchase obligation $ 25