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Revenue Recognition and Allowance for Credit Losses - Disaggregation of Revenue (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Disaggregation of Revenue [Line Items]    
Revenue from contracts $ 2,594 $ 2,761
Other 26 18
Total 2,620 2,779
Lease income 2 2
Houston Electric    
Disaggregation of Revenue [Line Items]    
Revenue from contracts 910 803
Other (9) (11)
Total 901 792
CERC    
Disaggregation of Revenue [Line Items]    
Revenue from contracts 1,485 1,700
Other 27 17
Total 1,512 1,717
Electric    
Disaggregation of Revenue [Line Items]    
Revenue from contracts 1,052 958
Other (3) (6)
Total 1,049 952
Natural Gas    
Disaggregation of Revenue [Line Items]    
Revenue from contracts 1,541 1,752
Other 29 23
Total 1,570 1,775
Corporate and Other    
Disaggregation of Revenue [Line Items]    
Revenue from contracts 1 51
Other 0 1
Total $ 1 $ 52