Indexed Debt Securities (ZENS) and Securities Related to ZENS (CenterPoint Energy)

6 Months Ended

Jun. 30, 2019

Investments, Debt and Equity Securities [Abstract]

Indexed Debt Securities (ZENS) and Securities Related to ZENS (CenterPoint Energy) [Text Block]

Indexed Debt Securities (ZENS) and Securities Related to ZENS (CenterPoint Energy)

(a) Investment in Securities Related to ZENS

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 Condensed Statements of Consolidated Income.

	Shares Held
	June 30, 2019	December 31, 2018
AT&T Common	10,212,945	10,212,945
Charter Common	872,503	872,912

(b) ZENS

In September 1999, CenterPoint Energy issued ZENS having an original principal amount of $1.0 billion of which $828 million remained outstanding as of June 30, 2019. Each ZENS is exchangeable at the holder’s option at any time for an amount of cash equal to 95% of the market value of the reference shares attributable to such note. The number and identity of the reference shares attributable to each ZENS are adjusted for certain corporate events. CenterPoint Energy’s reference shares for each ZENS consisted of the following:

	June 30, 2019	December 31, 2018
	(in shares)
AT&T Common	0.7185	0.7185
Charter Common	0.061382	0.061382

CenterPoint Energy pays interest on the ZENS at an annual rate of 2% plus the amount of any quarterly cash dividends paid in respect of the ZENS-Related Securities. The principal amount of the ZENS is subject to increases or decreases to the extent that the annual yield from interest and cash dividends on the ZENS-Related Securities is less than or more than 2.309%. The adjusted principal amount is defined in the ZENS instrument as “contingent principal.” As of June 30, 2019, the ZENS, having an original principal amount of $828 million and a contingent principal amount of $84 million, were outstanding and were exchangeable at the option of the holders for cash equal to 95% of the market value of the ZENS-Related Securities.