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CONDENSED STATEMENTS OF CONSOLIDATED CHANGES IN EQUITY - USD ($)
$ in Millions
Total
Preferred Stock [Member]
Common Stock [Member]
Additional Paid-in Capital [Member]
Retained Earnings [Member]
AOCI Attributable to Parent [Member]
Houston Electric [Member]
Houston Electric [Member]
Common Stock [Member]
Houston Electric [Member]
Additional Paid-in Capital [Member]
Houston Electric [Member]
Retained Earnings [Member]
Houston Electric [Member]
AOCI Attributable to Parent [Member]
CERC Corp [Member]
CERC Corp [Member]
Common Stock [Member]
CERC Corp [Member]
Additional Paid-in Capital [Member]
CERC Corp [Member]
Retained Earnings [Member]
CERC Corp [Member]
AOCI Attributable to Parent [Member]
Preferred Class B [Member]
Retained Earnings [Member]
Common Stock [Member]
Retained Earnings [Member]
Balance, beginning of period at Dec. 31, 2017   0                                
Balance, end of period at Jun. 30, 2018   0                                
Balance, beginning of period at Dec. 31, 2017     431,000,000         1,000         1,000          
Increase (Decrease) in Stockholders' Equity [Roll Forward]                                    
Issuances related to benefit and investment plans     0                              
Balance, end of period at Jun. 30, 2018     431,000,000         1,000         1,000          
Balance, beginning of period at Dec. 31, 2017   $ 0 $ 4 $ 4,209 $ 543 $ (68)   $ 0 $ 1,696 $ 673 $ 0   $ 0 $ 2,528 $ 574 $ 6    
Increase (Decrease) in Stockholders' Equity [Roll Forward]                                    
Issuances related to benefit and investment plans     0 6                            
Contribution From Parent                 0                  
Other                 1         0        
Net income (Loss) $ 90       90   $ 153     153   $ 166     166      
Dividends                                   $ (120)
Dividend to parent                   (63)         (211)      
Other comprehensive income (loss)           6         4              
Balance, end of period at Jun. 30, 2018 4,670 $ 0 $ 4 4,215 513 (62) 2,464 $ 0 1,697 763 4 3,063 $ 0 2,528 529 6    
Balance, beginning of period at Mar. 31, 2018   0                                
Balance, end of period at Jun. 30, 2018   0                                
Balance, beginning of period at Mar. 31, 2018     431,000,000         1,000         1,000          
Increase (Decrease) in Stockholders' Equity [Roll Forward]                                    
Issuances related to benefit and investment plans     0                              
Balance, end of period at Jun. 30, 2018     431,000,000         1,000         1,000          
Balance, beginning of period at Mar. 31, 2018   $ 0 $ 4 4,208 708 (63)   $ 0 1,697 693 4   $ 0 2,527 618 6    
Increase (Decrease) in Stockholders' Equity [Roll Forward]                                    
Issuances related to benefit and investment plans     0 7                            
Contribution From Parent                 0                  
Other                 0         1        
Net income (Loss) (75)       (75)   101     101   36     36      
Dividends                                   (120)
Dividend to parent                   (31)         (125)      
Other comprehensive income (loss)           1         0              
Balance, end of period at Jun. 30, 2018 $ 4,670 $ 0 $ 4 4,215 513 (62) 2,464 $ 0 1,697 763 4 3,063 $ 0 2,528 529 6    
Balance, beginning of period at Dec. 31, 2018   2,000,000                                
Balance, end of period at Jun. 30, 2019   2,000,000                                
Balance, beginning of period at Dec. 31, 2018 501,197,784   501,000,000         1,000         1,000          
Increase (Decrease) in Stockholders' Equity [Roll Forward]                                    
Issuances related to benefit and investment plans     1,000,000                              
Balance, end of period at Jun. 30, 2019 502,214,639   502,000,000         1,000         1,000          
Balance, beginning of period at Dec. 31, 2018 $ 8,058 $ 1,740 $ 5 6,072 349 (108) 2,682 $ 0 1,896 800 (14) 2,443 $ 0 2,015 423 5    
Increase (Decrease) in Stockholders' Equity [Roll Forward]                                    
Issuances related to benefit and investment plans     0 (7)                            
Contribution From Parent                 590                  
Other                 0         0        
Net income (Loss) 364       364   127     127   166     166      
Dividends                                 $ (17) (144)
Dividend to parent                   (40)         (103)      
Other comprehensive income (loss)           3         (1)              
Balance, end of period at Jun. 30, 2019 $ 8,257 $ 1,740 $ 5 6,065 552 (105) 3,358 $ 0 2,486 887 (15) 2,506 $ 0 2,015 486 5    
Balance, beginning of period at Mar. 31, 2019   2,000,000                                
Balance, end of period at Jun. 30, 2019   2,000,000                                
Balance, beginning of period at Mar. 31, 2019     502,000,000         1,000         1,000          
Increase (Decrease) in Stockholders' Equity [Roll Forward]                                    
Issuances related to benefit and investment plans     0                              
Balance, end of period at Jun. 30, 2019 502,214,639   502,000,000         1,000         1,000          
Balance, beginning of period at Mar. 31, 2019   $ 1,740 $ 5 6,060 518 (107)   $ 0 2,486 803 (15)   $ 0 2,015 541 5    
Increase (Decrease) in Stockholders' Equity [Roll Forward]                                    
Issuances related to benefit and investment plans     0 5                            
Contribution From Parent                 0                  
Other                 0         0        
Net income (Loss) $ 195       195   100     100   28     28      
Dividends                                 $ (17) $ (144)
Dividend to parent                   (16)         (83)      
Other comprehensive income (loss)           2         0              
Balance, end of period at Jun. 30, 2019 $ 8,257 $ 1,740 $ 5 $ 6,065 $ 552 $ (105) $ 3,358 $ 0 $ 2,486 $ 887 $ (15) $ 2,506 $ 0 $ 2,015 $ 486 $ 5