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Revenue Recognition - Summary of Contract Assets and Liabilities (Details) $ in Millions	12 Months Ended
	Dec. 31, 2023 USD ($)
Accounts Receivable
Opening balance as of December 31, 2022	$ 858
Closing balance as of December 31, 2023	652
Increase (decrease) in accounts receivable	(206)
Other Accrued Unbilled Revenues
Opening balance as of December 31, 2022	764
Closing balance as of December 31, 2023	516
Increase (decrease) in other accrued unbilled revenues	(248)
Contract Assets (1)
Opening balance as of December 31, 2022	4
Closing balance as of December 31, 2023	0
Increase (decrease) in contract with customer, asset	(4)
Contract Liabilities (1)
Opening balance as of December 31, 2022	45
Closing balance as of December 31, 2023	2
Increase (decrease) in contract with customer, liability	(43)
Revenue recognized included in the opening contract liability for the period	2
Houston Electric
Accounts Receivable
Opening balance as of December 31, 2022	271
Closing balance as of December 31, 2023	275
Increase (decrease) in accounts receivable	4
Other Accrued Unbilled Revenues
Opening balance as of December 31, 2022	142
Closing balance as of December 31, 2023	142
Increase (decrease) in other accrued unbilled revenues	0
Contract Liabilities (1)
Opening balance as of December 31, 2022	2
Closing balance as of December 31, 2023	2
Increase (decrease) in contract with customer, liability	0
Revenue recognized included in the opening contract liability for the period	2
CERC Corp
Accounts Receivable
Opening balance as of December 31, 2022	478
Closing balance as of December 31, 2023	330
Increase (decrease) in accounts receivable	(148)
Other Accrued Unbilled Revenues
Opening balance as of December 31, 2022	573
Closing balance as of December 31, 2023	329
Increase (decrease) in other accrued unbilled revenues	$ (244)

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