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Reportable Segments (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Dec. 31, 2022
Segment Reporting Information [Line Items]          
Revenues $ 1,860 $ 1,903 $ 6,514 $ 6,610  
Net income 282 202 725 923  
Total Assets 39,001   39,001   $ 38,546
Continuing Operations          
Segment Reporting Information [Line Items]          
Total Assets 39,001   39,001   38,546
Houston Electric          
Segment Reporting Information [Line Items]          
Revenues 1,083 935 2,784 2,562  
Net income 256 200 522 408  
Total Assets 17,159   17,159   15,339
Affiliates of NRG | Houston Electric          
Segment Reporting Information [Line Items]          
Revenues 370 327 826 797  
Affiliates of Vistra Energy Corp. | Houston Electric          
Segment Reporting Information [Line Items]          
Revenues 177 153 403 372  
Electric | Affiliates of NRG          
Segment Reporting Information [Line Items]          
Revenues 370 327 826 797  
Electric | Affiliates of Vistra Energy Corp.          
Segment Reporting Information [Line Items]          
Revenues 177 153 403 372  
Natural Gas          
Segment Reporting Information [Line Items]          
Revenues 597 692 3,136 3,334  
Corporate and Other          
Segment Reporting Information [Line Items]          
Revenues 2 65 128 184  
Corporate and Other | Pension and Other Postretirement Plans Costs          
Segment Reporting Information [Line Items]          
Regulatory assets 379   379   405
Operating Segments | Electric          
Segment Reporting Information [Line Items]          
Revenues 1,261 1,146 3,250 3,092  
Net income 290 234 593 489  
Total Assets 21,130   21,130   19,024
Operating Segments | Natural Gas          
Segment Reporting Information [Line Items]          
Revenues 597 692 3,136 3,334  
Net income 27 (10) 296 416  
Total Assets 16,802   16,802   18,043
Operating Segments | Corporate and Other          
Segment Reporting Information [Line Items]          
Revenues 2 65 128 184  
Net income (35) $ (22) (164) $ 18  
Total Assets $ 1,069   $ 1,069   $ 1,479