XML 288 R124.htm IDEA: XBRL DOCUMENT v3.25.0.1
Related Party Transactions (Houston Electric and CERC) - Schedule of Transactions (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Houston Electric      
Related Party Transaction [Line Items]      
Cash dividends paid to parent $ 339 $ 367 $ 316
Cash dividend paid to parent related to the sale of the Arkansas and Oklahoma Natural Gas businesses 0 0 0
Non-cash capital contribution from parent in payment for property, plant and equipment below 0 0 38
Cash paid to parent for property, plant and equipment below 0 0 65
Property, plant and equipment from parent 0 0 103
Houston Electric | Additional Paid-in-Capital      
Related Party Transaction [Line Items]      
Cash contribution from parent 844 885 1,143
Net assets acquired in the Restructuring 0 0 0
CERC      
Related Party Transaction [Line Items]      
Cash dividends paid to parent 442 496 124
Cash dividend paid to parent related to the sale of the Arkansas and Oklahoma Natural Gas businesses 0 0 720
Non-cash capital contribution from parent in payment for property, plant and equipment below 0 0 54
Cash paid to parent for property, plant and equipment below 0 0 61
Property, plant and equipment from parent 0 0 115
CERC | Additional Paid-in-Capital      
Related Party Transaction [Line Items]      
Cash contribution from parent 290 500 289
Net assets acquired in the Restructuring $ 0 $ 0 $ 2,345