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Indexed Debt Securities (ZENS) and Securities Related to ZENS (CenterPoint Energy) (Tables)
 12 Months Ended
Dec. 31, 2019
Indexed Debt Securities [Abstract]  
Summarized Financial Information on Investment in Time Warner Securities and Indexed Debt Security Obligation [Table Text Block]
The following table sets forth summarized financial information regarding CenterPoint Energy’s investment in ZENS-Related Securities and each component of CenterPoint Energy’s ZENS obligation. 
 
ZENS-Related
Securities
 
Debt
Component
of ZENS
 
Derivative
Component
of ZENS
 
(in millions)
Balance as of December 31, 2016
$
953

 
$
114

 
$
717

Accretion of debt component of ZENS
—

 
27

 
—

2% interest paid
—

 
(17
)
 
—

Distribution to ZENS holders
—

 
(2
)
 
—

Gain on indexed debt securities
—

 
—

 
(49
)
Gain on ZENS-Related Securities
7

 
—

 
—

Balance as of December 31, 2017
960

 
122

 
668

Accretion of debt component of ZENS
—

 
21

 
—

2% interest paid
—

 
(17
)
 
—

Sale of ZENS-Related Securities
(398
)
 
—

 
—

Distribution to ZENS holders
—

 
(102
)
 
(46
)
Gain on indexed debt securities
—

 
—

 
(21
)
Loss on ZENS-Related Securities
(22
)
 
—

 
—

Balance as of December 31, 2018
540

 
24

 
601

Accretion of debt component of ZENS
—

 
17

 
—

2% interest paid
—

 
(17
)
 
—

Distribution to ZENS holders
—

 
(5
)
 
—

Loss on indexed debt securities
—

 
—

 
292

Gain on ZENS-Related Securities
282

 
—

 
—

Balance as of December 31, 2019
$
822

 
$
19

 
$
893


 
CenterPoint Energy’s reference shares for each ZENS consisted of the following:
 
 
December 31,
 
 
2019
 
2018
 
 
(in shares)
AT&T Common
 
0.7185

 
0.7185

Charter Common
 
0.061382

 
0.061382


A subsidiary of CenterPoint Energy holds shares of certain securities detailed in the table below, which are classified as trading securities and are expected to be held to facilitate CenterPoint Energy’s ability to meet its obligation under the ZENS. Unrealized gains and losses resulting from changes in the market value of the ZENS-Related Securities are recorded in CenterPoint Energy’s Statements of Consolidated Income.
 
 
Shares Held at December 31,
 
 
2019
 
2018
AT&T Common
 
10,212,945

 
10,212,945

Charter Common
 
872,503

 
872,912