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CONDENSED CONSOLIDATED BALANCE SHEETS (Parentheticals) - USD ($)
$ in Millions
Mar. 31, 2019
Dec. 31, 2018
Cash and cash equivalents $ 255 $ 4,231
Accounts receivable, less bad debt reserve 1,415 1,190
Bad debt reserve 29 18
Prepaid expenses and other current assets 241 192
Regulatory assets $ 2,229 $ 1,967
Preferred stock par value (in dollars per share) $ 0.01  
Cumulative preferred stock authorized (in shares) 20,000,000  
Common stock par value (in dollars per share) $ 0.01 $ 0.01
Common stock authorized (in shares) 1,000,000,000 1,000,000,000
Common stock outstanding (in shares) 502,168,182 501,197,784
Variable Interest Entity, Primary Beneficiary [Member]    
Cash and cash equivalents $ 242 $ 335
Accounts receivable, less bad debt reserve 56 56
Prepaid expenses and other current assets 33 34
Regulatory assets 977 1,059
Houston Electric [Member]    
Cash and cash equivalents 243 335
Bad debt reserve 1 1
Prepaid expenses and other current assets 46 61
Regulatory assets 1,056 1,124
Houston Electric [Member] | Variable Interest Entity, Primary Beneficiary [Member]    
Cash and cash equivalents 242 335
Accounts receivable, less bad debt reserve 56 56
Prepaid expenses and other current assets 33 34
Regulatory assets 977 1,059
CERC Corp [Member]    
Cash and cash equivalents 1 14
Accounts receivable, less bad debt reserve 856 894
Bad debt reserve 22 17
Prepaid expenses and other current assets 65 115
Regulatory assets $ 180 $ 181
Cumulative Preferred Stock [Member]    
Preferred stock par value (in dollars per share) $ 0.01 $ 0.01
Cumulative preferred stock authorized (in shares) 20,000,000 20,000,000
Series A Preferred Stock [Member]    
Preferred stock par value (in dollars per share) $ 0.01 $ 0.01
Preferred stock aggregate liquidation preference $ 800 $ 800
Preferred stock outstanding (in shares) 800,000 800,000
Series B Preferred Stock [Member]    
Preferred stock par value (in dollars per share) $ 0.01 $ 0.01
Preferred stock aggregate liquidation preference $ 978 $ 978
Preferred stock outstanding (in shares) 977,500 977,500