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Revenue Recognition and Allowance for Credit Losses - Summary of Contract Assets and Liabilities (Details) $ in Millions | 9 Months Ended
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Sep. 30, 2023 USD ($)
Accounts Receivable |
Opening balance as of December 31, 2022 | $ 858
Closing balance as of September 30, 2023 | 733
Increase (decrease) in accounts receivable | (125)
Other Accrued Unbilled Revenues |
Opening balance as of December 31, 2022 | 764
Closing balance as of September 30, 2023 | 340
Increase (decrease) in other accrued unbilled revenues | (424)
Contract Assets |
Opening balance as of December 31, 2022 | 4
Closing balance as of September 30, 2023 | 0
Decrease in contract assets | (4)
Contract Liabilities |
Opening balance as of December 31, 2022 | 45
Closing balance as of September 30, 2023 | 5
Increase (decrease) in contract liabilities | (40)
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 September 30, 2023 | 459
Increase (decrease) in accounts receivable | 188
Other Accrued Unbilled Revenues |
Opening balance as of December 31, 2022 | 142
Closing balance as of September 30, 2023 | 182
Increase (decrease) in other accrued unbilled revenues | 40
Contract Liabilities |
Opening balance as of December 31, 2022 | 2
Closing balance as of September 30, 2023 | 5
Increase (decrease) in contract liabilities | 3
Revenue recognized included in the opening contract liability for the period | 2
CERC |
Accounts Receivable |
Opening balance as of December 31, 2022 | 478
Closing balance as of September 30, 2023 | 230
Increase (decrease) in accounts receivable | (248)
Other Accrued Unbilled Revenues |
Opening balance as of December 31, 2022 | 573
Closing balance as of September 30, 2023 | 119
Increase (decrease) in other accrued unbilled revenues | $ (454)

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