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Revenue Recognition - Summary of Contract Assets and Liabilities (Details) $ in Millions | 12 Months Ended
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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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