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Indexed Debt Securities (ZENS) and Securities Related to ZENS (CenterPoint Energy) (Details)
12 Months Ended
Dec. 31, 2018
USD ($)
shares
Dec. 31, 2017
USD ($)
shares
Dec. 31, 2016
USD ($)
Jun. 14, 2018
$ / shares
shares
Jan. 31, 2018
$ / shares
Nov. 26, 2017
$ / shares
ZENS-Related Securities            
ZENS-Related Securities $ 960,000,000          
Proceeds from sale and maturity of marketable securities (398,000,000) $ 0 $ (178,000,000)      
Gain (loss) on ZENS-Related Securities (22,000,000) 7,000,000 326,000,000      
ZENS-Related Securities 540,000,000 960,000,000        
Debt component of ZENS            
Debt Component of ZENS 122,000,000          
Distribution to ZENS holders 398,000,000 0 178,000,000      
Debt Component of ZENS 24,000,000 122,000,000        
Derivative component of ZENS            
Derivative Component of ZENS 668,000,000          
Distribution to ZENS holders 398,000,000 0 178,000,000      
Loss (gain) on indexed debt securities 232,000,000 (49,000,000) 413,000,000      
Derivative Component of ZENS $ 601,000,000 $ 668,000,000        
AT&T Common [Member]            
Indexed Debt Securities [Line Items]            
Balance of investment owned (in shares) | shares 10,212,945          
Charter Common [Member]            
Indexed Debt Securities [Line Items]            
Balance of investment owned (in shares) | shares 872,912 872,503        
Time Common [Member]            
Indexed Debt Securities [Line Items]            
Balance of investment owned (in shares) | shares   888,392        
ZENS early exchange ratio         100.00%  
TW Common [Member]            
Indexed Debt Securities [Line Items]            
Balance of investment owned (in shares) | shares   7,107,130        
ZENS-Related Securities [Member]            
ZENS-Related Securities            
ZENS-Related Securities $ 960,000,000 $ 953,000,000 805,000,000      
Proceeds from sale and maturity of marketable securities (398,000,000)   (178,000,000)      
Gain (loss) on ZENS-Related Securities (22,000,000) 7,000,000 326,000,000      
ZENS-Related Securities 540,000,000 960,000,000 953,000,000      
Debt Component Of ZENS [Member]            
Debt component of ZENS            
Debt Component of ZENS 122,000,000 114,000,000 145,000,000      
Accretion of debt component of ZENS 21,000,000 27,000,000 26,000,000      
2 % interest paid (17,000,000) (17,000,000) (17,000,000)      
Distribution to ZENS holders 102,000,000 2,000,000 40,000,000      
Debt Component of ZENS 24,000,000 122,000,000 114,000,000      
Derivative component of ZENS            
Distribution to ZENS holders 102,000,000 2,000,000 40,000,000      
Derivative Component Of ZENS [Member]            
Debt component of ZENS            
Distribution to ZENS holders 46,000,000 0 21,000,000      
Derivative component of ZENS            
Derivative Component of ZENS 668,000,000 717,000,000 442,000,000      
Distribution to ZENS holders 46,000,000 0 21,000,000      
Loss (gain) on indexed debt securities (21,000,000) (49,000,000) 296,000,000      
Derivative Component of ZENS 601,000,000 $ 668,000,000 $ 717,000,000      
Subordinated Debt ZENS Member            
Indexed Debt Securities [Line Items]            
Principal amount of debt issued 1,000,000,000          
Outstanding debt balance $ 828,000,000          
Subordinated note cash exchangeable percentage of fair value 95.00%          
ZENS annual interest rate 2.00%          
Target annual yield on referenced shares before increase or decrease of principal amount of subordinated note 2.309%          
Contingent principal amount of indexed debt securities issued by CenterPoint Energy in September 1999 and outstanding and exchangeable $ 93,000,000          
The cash exchange amount from referenced shares per $1,000 face amount of individual notes 620          
Face amount of each indexed debt security notes issued by CenterPoint Energy in September 1999 $ 1,000          
Subordinated Debt ZENS Member | AT&T Common [Member]            
Indexed Debt Securities [Line Items]            
Number of shares referenced in exchangeable subordinated note | shares 0.7185          
Subordinated Debt ZENS Member | Charter Common [Member]            
Indexed Debt Securities [Line Items]            
Number of shares referenced in exchangeable subordinated note | shares 0.061382 0.061382        
Subordinated Debt ZENS Member | Time Common [Member]            
Indexed Debt Securities [Line Items]            
Number of shares referenced in exchangeable subordinated note | shares   0.0625        
Subordinated Debt ZENS Member | TW Common [Member]            
Indexed Debt Securities [Line Items]            
Number of shares referenced in exchangeable subordinated note | shares   0.5        
AT&T To Acquire Time Warner [Member]            
Indexed Debt Securities [Line Items]            
Indexed debt – reduction $ (95,000,000)          
Indexed debt securities derivative – reduction (45,000,000)          
Loss on indexed debt securities 242,000,000          
Debt component of ZENS            
Distribution to ZENS holders 382,000,000          
Derivative component of ZENS            
Distribution to ZENS holders 382,000,000          
AT&T To Acquire Time Warner [Member] | AT&T Common [Member]            
Indexed Debt Securities [Line Items]            
Cash paid per share exchanged | $ / shares       $ 53.75    
Fractional shares exchanged for each TW Common share held | shares       1.437    
Cash proceeds received for shares exchanged 382,000,000          
Total AT&T shares received in exchange for TW Common shares held | shares       10,212,945    
Meredith to acquire time [Member]            
Indexed Debt Securities [Line Items]            
Indexed debt – reduction (4,000,000)          
Indexed debt securities derivative – reduction (1,000,000)          
Loss on indexed debt securities 11,000,000          
Debt component of ZENS            
Distribution to ZENS holders 16,000,000          
Derivative component of ZENS            
Distribution to ZENS holders 16,000,000          
Meredith to acquire time [Member] | Time Common [Member]            
Indexed Debt Securities [Line Items]            
Cash paid per share exchanged | $ / shares         $ 18.50 $ 18.50
Cash proceeds received for shares exchanged $ 16,000,000