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CONDENSED STATEMENTS OF CONSOLIDATED CASH FLOWS (Unaudited) - HOUSTON ELECTRIC - USD ($)
$ in Millions
 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Cash Flows from Operating Activities:    
Net income $ 788 $ 771
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 1,125 1,083
Deferred income taxes 84 238
Changes in other assets and liabilities:    
Accounts receivable and unbilled revenues, net 23 145
Inventory (64) 19
Accounts payable (271) (247)
Taxes receivable 62 (75)
Current regulatory assets and liabilities 79 (91)
Non-current regulatory assets and liabilities 21 (553)
Other operating activities, net (54) (37)
Net cash provided by operating activities 1,712 1,250
Cash Flows from Investing Activities:    
Capital expenditures (3,389) (2,501)
Other investing activities, net (75) (58)
Net cash used in investing activities (2,602) (2,559)
Cash Flows from Financing Activities:    
Proceeds from long-term debt and term loans, net 2,852 2,757
Payments of long-term debt (1,073) (963)
Payment of debt issuance costs (17) (25)
Other financing activities, net (18) (28)
Net cash provided by financing activities 905 1,329
Net Increase in Cash, Cash Equivalents and Restricted Cash 15 20
Cash, Cash Equivalents and Restricted Cash at Beginning of Period 30 109
Cash, Cash Equivalents and Restricted Cash at End of Period 45 129
Supplemental Disclosure of Cash Flow Information    
Cash paid for interest, net of capitalized interest 763 620
Cash paid (refunds received) for income taxes, net (15) (8)
Supplemental Disclosure of Non-cash Transactions    
Accounts payable related to capital expenditures 315 1,133
Houston Electric    
Cash Flows from Operating Activities:    
Net income 456 465
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 585 580
Deferred income taxes 73 42
Changes in other assets and liabilities:    
Accounts receivable and unbilled revenues, net (275) (203)
Accounts receivable/payable–affiliated companies (39) (19)
Inventory 8 16
Accounts payable (110) (113)
Taxes receivable (8) 38
Current regulatory assets and liabilities 8 (1)
Other current assets and liabilities 55 53
Non-current regulatory assets and liabilities (93) (527)
Other non-current assets and liabilities 6 (10)
Other operating activities, net (14) (15)
Net cash provided by operating activities 652 306
Cash Flows from Investing Activities:    
Capital expenditures (1,958) (1,171)
(Increase) decrease in notes receivable–affiliated companies (141) 238
Other investing activities, net 61 (111)
Net cash used in investing activities (2,038) (1,044)
Cash Flows from Financing Activities:    
Proceeds from long-term debt and term loans, net 1,496 699
Payments of long-term debt 0 (80)
Increase in notes payable–affiliated companies 0 71
Payment of debt issuance costs (16) (4)
Dividends to parent (182) (249)
Contribution from parent 94 324
Other financing activities, net (1) (2)
Net cash provided by financing activities 1,391 759
Net Increase in Cash, Cash Equivalents and Restricted Cash 5 21
Cash, Cash Equivalents and Restricted Cash at Beginning of Period 14 89
Cash, Cash Equivalents and Restricted Cash at End of Period 19 110
Supplemental Disclosure of Cash Flow Information    
Cash paid for interest, net of capitalized interest 284 218
Cash paid (refunds received) for income taxes, net 28 26
Supplemental Disclosure of Non-cash Transactions    
Accounts payable related to capital expenditures $ 231 $ 1,075