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Revenue Recognition and Allowance for Credit Losses - Schedule of Contract Assets and Liabilities (Details)
$ in Millions
 3 Months Ended
Mar. 31, 2024
USD ($)
Accounts Receivable  
Opening balance as of December 31, 2023 $ 652
Closing balance as of March 31, 2024 656
Increase (decrease) in accounts receivable 4
Other Accrued Unbilled Revenues  
Opening balance as of December 31, 2023 516
Closing balance as of March 31, 2024 392
Increase (decrease) in other accrued unbilled revenues (124)
Contract Liabilities  
Opening balance as of December 31, 2023 2
Closing balance as of March 31, 2024 3
Increase (decrease) in contract liabilities 1
Revenue recognized included in the opening contract liability for the period 1
Houston Electric  
Accounts Receivable  
Opening balance as of December 31, 2023 275
Closing balance as of March 31, 2024 250
Increase (decrease) in accounts receivable (25)
Other Accrued Unbilled Revenues  
Opening balance as of December 31, 2023 142
Closing balance as of March 31, 2024 122
Increase (decrease) in other accrued unbilled revenues (20)
Contract Liabilities  
Opening balance as of December 31, 2023 2
Closing balance as of March 31, 2024 3
Increase (decrease) in contract liabilities 1
Revenue recognized included in the opening contract liability for the period 1
CERC  
Accounts Receivable  
Opening balance as of December 31, 2023 330
Closing balance as of March 31, 2024 355
Increase (decrease) in accounts receivable 25
Other Accrued Unbilled Revenues  
Opening balance as of December 31, 2023 329
Closing balance as of March 31, 2024 233
Increase (decrease) in other accrued unbilled revenues $ (96)