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Reportable Segments (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Dec. 31, 2021
Segment Reporting Information [Line Items]          
Operating revenues $ 1,903 $ 1,749 $ 6,610 $ 6,038  
Net Income (Loss) 202 150 923 630  
Net income from discontinued operations 0 68 0 202  
Net Income 202 218 923 832  
Total Assets 36,719   36,719   $ 37,679
Assets Held for Sale 0   0   2,338
Continuing Operations          
Segment Reporting Information [Line Items]          
Total Assets 36,719   36,719   35,341
Houston Electric          
Segment Reporting Information [Line Items]          
Operating revenues 935 874 2,562 2,344  
Net Income 200 151 408 307  
Total Assets 14,991   14,991   12,980
Houston Electric | Affiliates of NRG Energy, Inc.          
Segment Reporting Information [Line Items]          
Operating revenues 327 285 797 672  
Houston Electric | Affiliates of Vistra Energy Corp.          
Segment Reporting Information [Line Items]          
Operating revenues 153 128 372 303  
Electric | Affiliates of NRG Energy, Inc.          
Segment Reporting Information [Line Items]          
Operating revenues 327 285 797 672  
Electric | Affiliates of Vistra Energy Corp.          
Segment Reporting Information [Line Items]          
Operating revenues 153 128 372 303  
Natural Gas          
Segment Reporting Information [Line Items]          
Operating revenues 692 619 3,334 3,022  
Corporate and Other          
Segment Reporting Information [Line Items]          
Operating revenues 65 74 184 193  
Corporate and Other | Pension and Other Postretirement Plans Costs          
Segment Reporting Information [Line Items]          
Regulatory assets 424   424   427
Operating Segments | Electric          
Segment Reporting Information [Line Items]          
Operating revenues 1,146 1,056 3,092 2,823  
Net Income (Loss) 234 185 489 385  
Total Assets 18,524   18,524   16,548
Operating Segments | Natural Gas          
Segment Reporting Information [Line Items]          
Operating revenues 692 619 3,334 3,022  
Net Income (Loss) (10) 5 416 308  
Total Assets 16,796   16,796   16,270
Operating Segments | Corporate and Other          
Segment Reporting Information [Line Items]          
Operating revenues 65 74 184 193  
Net Income (Loss) (22) $ (40) 18 $ (63)  
Total Assets $ 1,399   $ 1,399   $ 2,523