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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, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Disaggregation of Revenue [Line Items]        
Revenue from contracts $ 1,864 $ 1,906 $ 6,497 $ 6,653
Other (4) (3) 17 (43)
Total 1,860 1,903 6,514 6,610
Lease income 2 1 6 5
Houston Electric        
Disaggregation of Revenue [Line Items]        
Revenue from contracts 1,100 949 2,821 2,597
Other (17) (14) (37) (35)
Total 1,083 935 2,784 2,562
CERC        
Disaggregation of Revenue [Line Items]        
Revenue from contracts 575 667 3,012 3,257
Other 8 5 33 (25)
Total 583 672 3,045 3,232
Lease income 1 1 3 2
Electric        
Disaggregation of Revenue [Line Items]        
Revenue from contracts 1,274 1,155 3,272 3,113
Other (13) (9) (22) (21)
Total 1,261 1,146 3,250 3,092
Natural Gas        
Disaggregation of Revenue [Line Items]        
Revenue from contracts 589 686 3,100 3,358
Other 8 6 36 (24)
Total 597 692 3,136 3,334
Corporate and Other        
Disaggregation of Revenue [Line Items]        
Revenue from contracts 1 65 125 182
Other 1 0 3 2
Total $ 2 $ 65 $ 128 $ 184