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Summary of Significant Accounting Policies - Regulatory Assets and Liabilities (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Regulatory Assets and Liabilities [Line Items]    
Current regulatory assets $ 26 $ 73
Non-current regulatory assets 214 183
Total regulatory assets(a) 240 256
Current regulatory liabilities 45 50
Non-current regulatory liabilities 188 175
Total regulatory liabilities(b) 233 $ 225
Regulatory assets recoverable without earning a return $ 138  
Regulatory assets, weighted average remaining recovery period 10 years  
Remaining Amounts of Regulatory Liabilities Subject to Crediting Period $ 104  
Remaining Recovery Period of Regulatory Liabilities Subject to Defined Crediting Period 13 years  
Remaining Amounts of Regulatory Liabilities Not Subject to Defined Crediting Period $ 84  
Loss on Disposal of Assets    
Regulatory Assets and Liabilities [Line Items]    
Total regulatory assets(a) 100  
Income Tax Gross Up on AFUDC Equity    
Regulatory Assets and Liabilities [Line Items]    
Total regulatory assets(a) 43  
Other Regulatory Assets (Liabilities)    
Regulatory Assets and Liabilities [Line Items]    
Total regulatory assets(a) $ 97