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Regulatory Matters - SPPC - Regulatory Assets (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Regulatory Assets [Line Items]    
Total regulatory assets $ 5,062 $ 3,963
Regulatory assets, current 1,319 544
Regulatory assets, noncurrent 3,743 3,419
Regulatory assets not earning a return on investment $ 2,300 1,800
Deferred operating costs    
Regulatory Assets [Line Items]    
Regulatory asset, amortization period 10 years  
Total regulatory assets $ 83 103
Unrealized losses on regulated derivative contracts    
Regulatory Assets [Line Items]    
Regulatory asset, amortization period 1 year  
Total regulatory assets $ 112 157
SPPC    
Regulatory Assets [Line Items]    
Total regulatory assets 611 440
Regulatory assets, current 357 177
Regulatory assets, noncurrent 254 263
Regulatory assets not earning a return on investment $ 143 158
SPPC | Deferred energy costs    
Regulatory Assets [Line Items]    
Regulatory asset, amortization period 1 year  
Total regulatory assets $ 277 107
SPPC | Natural disaster protection plan    
Regulatory Assets [Line Items]    
Regulatory asset, amortization period 1 year  
Total regulatory assets $ 69 62
SPPC | Merger costs from 1999 merger    
Regulatory Assets [Line Items]    
Regulatory asset, amortization period 24 years  
Total regulatory assets $ 63 66
SPPC | Employee benefit plans    
Regulatory Assets [Line Items]    
Regulatory asset, amortization period 8 years  
Total regulatory assets $ 57 46
SPPC | Deferred operating costs    
Regulatory Assets [Line Items]    
Regulatory asset, amortization period 7 years  
Total regulatory assets $ 35 31
SPPC | Unrealized losses on regulated derivative contracts    
Regulatory Assets [Line Items]    
Regulatory asset, amortization period 1 year  
Total regulatory assets $ 21 35
SPPC | Other    
Regulatory Assets [Line Items]    
Total regulatory assets $ 89 $ 93