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Significant Accounting Policies - Narrative (Details)
 3 Months Ended 12 Months Ended
Jun. 30, 2022
USD ($)
Jun. 30, 2021
USD ($)
Dec. 31, 2023
USD ($)
internal_grade
Dec. 31, 2022
USD ($)
Dec. 31, 2021
USD ($)
Financing Receivable, Past Due [Line Items]          
Number of internal grades of credit quality | internal_grade     3    
Asset (gains) losses and impairments, net     $ 4,000,000 $ 23,000,000 $ (17,000,000)
Proceeds from sale of notes receivable     $ 0 22,000,000 0
Specific review of probable future collections based on receivable balances, threshold duration     30 days    
Uncollectible expense (recovery)     $ 0 0 0
Allowance for expected credit loss related to accounts receivable     0 0  
Operation and maintenance     245,000,000 $ 267,000,000 231,000,000
Separation related transaction costs         20,000,000
Related Party          
Financing Receivable, Past Due [Line Items]          
Operation and maintenance         $ 32,000,000
Past due          
Financing Receivable, Past Due [Line Items]          
Financing receivables     0    
Notes receivable          
Financing Receivable, Past Due [Line Items]          
Financing receivables on nonaccrual status     $ 0    
Asset (gains) losses and impairments, net $ 17,000,000 $ 19,000,000      
Proceeds from sale of notes receivable $ 22,000,000        
Notes receivable | Minimum          
Financing Receivable, Past Due [Line Items]          
Period past due     60 days    
Notes receivable | Maximum          
Financing Receivable, Past Due [Line Items]          
Period past due     120 days    
Notes receivable | Internal grade 1 | Related Party          
Financing Receivable, Past Due [Line Items]          
Financing receivable originated prior to 2021     $ 4,000,000