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Revenue Recognition and Allowance for Credit Losses - Summary of Contract Assets and Liabilities (Details)
$ in Millions
 3 Months Ended
Mar. 31, 2023
USD ($)
Accounts Receivable  
Opening balance as of December 31, 2022 $ 858
Closing balance as of March 31, 2023 837
Increase (decrease) in accounts receivable (21)
Other Accrued Unbilled Revenues  
Opening balance as of December 31, 2022 764
Closing balance as of March 31, 2023 398
Increase (decrease) in other accrued unbilled revenues (366)
Contract Assets  
Opening balance as of December 31, 2022 4
Closing balance as of March 31, 2023 4
Increase (decrease) in contract assets 0
Contract Liabilities  
Opening balance as of December 31, 2022 45
Closing balance as of March 31, 2023 56
Increase (decrease) in contract liabilities 11
Revenue recognized included in the opening contract liability for the period 21
Houston Electric  
Accounts Receivable  
Opening balance as of December 31, 2022 271
Closing balance as of March 31, 2023 240
Increase (decrease) in accounts receivable (31)
Other Accrued Unbilled Revenues  
Opening balance as of December 31, 2022 142
Closing balance as of March 31, 2023 89
Increase (decrease) in other accrued unbilled revenues (53)
Contract Liabilities  
Opening balance as of December 31, 2022 2
Closing balance as of March 31, 2023 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, 2022 478
Closing balance as of March 31, 2023 509
Increase (decrease) in accounts receivable 31
Other Accrued Unbilled Revenues  
Opening balance as of December 31, 2022 573
Closing balance as of March 31, 2023 275
Increase (decrease) in other accrued unbilled revenues $ (298)