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Revenue Recognition and Allowance for Credit Losses - Disaggregation of Revenue (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers $ 1,849 $ 1,864 $ 6,349 $ 6,497
Other 7 (4) 32 17
Total 1,856 1,860 6,381 6,514
Lease income 1 2 5 6
Houston Electric        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 1,065 1,100 3,024 2,821
Other (7) (17) (21) (37)
Total 1,058 1,083 3,003 2,784
CERC        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 593 575 2,760 3,012
Other 7 8 31 33
Total 600 583 2,791 3,045
Lease income 1 1 3 3
Electric        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 1,245 1,274 3,504 3,272
Other (2) (13) (5) (22)
Total 1,243 1,261 3,499 3,250
Natural Gas        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 603 589 2,842 3,100
Other 8 8 34 36
Total 611 597 2,876 3,136
Corporate and Other        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 1 1 3 125
Other 1 1 3 3
Total $ 2 $ 2 $ 6 $ 128