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Fair Value Measurements (Tables)
 6 Months Ended
Jun. 30, 2019
Fair Value Disclosures [Abstract]  
Fair value, assets and liabilities measured on a recurring basis [Table Text Block]

The following tables present information about the Registrants’ assets and liabilities (including derivatives that are presented net) measured at fair value on a recurring basis as of June 30, 2019 and December 31, 2018 and indicate the fair value hierarchy of the valuation techniques utilized by the Registrants to determine such fair value.

CenterPoint Energy
 
June 30, 2019
 
December 31, 2018
 

Level 1
 
Level 2
 
Level 3
 
Netting
(1)
 
Total
 

Level 1
 
Level 2
 
Level 3
 
Netting
(1)
 
Total
Assets
(in millions)
Corporate equities
$
690

 
$
—

 
$
—

 
$
—

 
$
690

 
$
542

 
$
—

 
$
—

 
$
—

 
$
542

Investments, including money market funds (2)
63

 
—

 
—

 
—

 
63

 
66

 
—

 
—

 
—

 
66

Natural gas derivatives (3)(4)
—

 
215

 
33

 
(103
)
 
145

 
—

 
173

 
47

 
(82
)
 
138

Hedged portion of natural gas inventory
—

 
—

 
—

 
—

 
—

 
1

 
—

 
—

 
—

 
1

Total assets
$
753

 
$
215

 
$
33

 
$
(103
)
 
$
898

 
$
609

 
$
173

 
$
47

 
$
(82
)
 
$
747

Liabilities
 

 
 

 
 

 
 

 
 

 
 
 
 
 
 
 
 
 
 
Indexed debt securities derivative
$
—

 
$
755

 
$
—

 
$
—

 
$
755

 
$
—

 
$
601

 
$
—

 
$
—

 
$
601

Interest rate derivatives
—

 
8

 
—

 
—

 
8

 
24

 
—

 
—

 
—

 
24

Natural gas derivatives (3)(4)
—

 
177

 
13

 
(139
)
 
51

 
—

 
191

 
17

 
(101
)
 
107

Hedged portion of natural gas inventory
9

 
—

 
—

 
—

 
9

 
—

 
—

 
—

 
—

 
—

Total liabilities
$
9

 
$
940

 
$
13

 
$
(139
)
 
$
823

 
$
24

 
$
792

 
$
17

 
$
(101
)
 
$
732


Houston Electric
 
June 30, 2019
 
December 31, 2018
 

Level 1
 
Level 2
 
Level 3
 
Netting
 
Total
 

Level 1
 
Level 2
 
Level 3
 
Netting
 
Total
Assets
(in millions)
Investments, including money market funds (2)
$
47

 
$
—

 
$
—

 
$
—

 
$
47

 
$
48

 
$
—

 
$
—

 
$
—

 
$
48

Total assets
$
47

 
$
—

 
$
—

 
$
—

 
$
47

 
$
48

 
$
—

 
$
—

 
$
—

 
$
48

Liabilities
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Interest rate derivatives
$
—

 
$
—

 
$
—

 
$
—

 
$
—

 
$
24

 
$
—

 
$
—

 
$
—

 
$
24

Total liabilities
$
—

 
$
—

 
$
—

 
$
—

 
$
—

 
$
24

 
$
—

 
$
—

 
$
—

 
$
24


CERC
 
June 30, 2019
 
December 31, 2018
 

Level 1
 
Level 2
 
Level 3
 
Netting
(1)
 
Total
 

Level 1
 
Level 2
 
Level 3
 
Netting
(1)
 
Total
Assets
(in millions)
Corporate equities
$
3

 
$
—

 
$
—

 
$
—

 
$
3

 
$
2

 
$
—

 
$
—

 
$
—

 
$
2

Investments, including money market funds (2)
11

 
—

 
—

 
—

 
11

 
11

 
—

 
—

 
—

 
11

Natural gas derivatives (3)(4)
—


215


33


(103
)
 
145

 
—

 
173

 
47

 
(82
)
 
138

Hedged portion of natural gas inventory
—


—


—


—

 
—

 
1

 
—

 
—

 
—

 
1

Total assets
$
14

 
$
215

 
$
33

 
$
(103
)
 
$
159

 
$
14

 
$
173

 
$
47

 
$
(82
)
 
$
152

Liabilities
 

 
 

 
 

 
 

 
 

 
 
 
 
 
 
 
 
 
 
Natural gas derivatives (3)(4)
$
—


$
161


$
13


$
(139
)
 
$
35

 
$
—

 
$
191

 
$
17

 
$
(101
)
 
$
107

Hedged portion of natural gas inventory
9

 
—

 
—

 
—

 
9

 
—

 
—

 
—

 
—

 
—

Total liabilities
$
9

 
$
161

 
$
13

 
$
(139
)
 
$
44

 
$
—

 
$
191

 
$
17

 
$
(101
)
 
$
107


(1)
Amounts represent the impact of legally enforceable master netting arrangements that allow CenterPoint Energy and CERC to settle positive and negative positions and also include cash collateral posted with the same counterparties as follows:
 
June 30, 2019
 
December 31, 2018
 
CenterPoint Energy
 
CERC
 
CenterPoint Energy
 
CERC
 
(in millions)
Cash collateral posted with the same counterparties
$
36

 
$
36

 
$
19

 
$
19


(2)
Amounts are included in Prepaid expenses and other current assets in the Condensed Consolidated Balance Sheets.

(3)
Natural gas derivatives include no material amounts related to physical forward transactions with Enable.

(4)
Level 1 natural gas derivatives include exchange-traded derivatives cleared by the CME, which deems that financial instruments cleared by the CME are settled daily in connection with posted cash payments. As a result of this exchange rule, CME-related derivatives are considered to have no fair value at the balance sheet date for financial reporting purposes and are presented in Level 1 net of posted cash; however, the derivatives remain outstanding and subject to future commodity price fluctuations until they are settled in accordance with their contractual terms. Derivative transactions cleared on exchanges other than the CME (e.g., the Intercontinental Exchange or ICE) continue to be reported on a gross basis.
Assets and liabilities measured at fair value on a recurring basis using significant unobservable inputs [Table Text Block]
The following table presents additional information about assets or liabilities, including derivatives that are measured at fair value on a recurring basis for which CenterPoint Energy and CERC have utilized Level 3 inputs to determine fair value:
 
Three Months Ended June 30,
 
Six Months Ended June 30,
 
2019
 
2018
 
2019
 
2018
 
CenterPoint Energy
 
CERC
 
CenterPoint Energy
 
CERC
 
CenterPoint Energy
 
CERC
 
CenterPoint Energy
 
CERC
 
(in millions)
Beginning balance
$
13

 
$
13

 
$
(662
)
 
$
12

 
$
30

 
$
30

 
$
(622
)
 
$
46

Total gains (losses)
13

 
13

 
(11
)
 
1

 
12

 
12

 
(16
)
 
3

Total settlements
(2
)
 
(2
)
 
44

 
(1
)
 
(17
)
 
(17
)
 
11

 
(35
)
Transfers into Level 3
(2
)
 
(2
)
 
1

 
1

 
(1
)
 
(1
)
 
1

 
1

Transfers out of Level 3
(2
)
 
(2
)
 
—

 
—

 
(4
)
 
(4
)
 
(2
)
 
(2
)
Ending balance (1)
$
20

 
$
20

 
$
(628
)
 
$
13

 
$
20

 
$
20

 
$
(628
)
 
$
13

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
The amount of total gains (losses) for the period included in earnings attributable to the change in unrealized gains or losses relating to assets still held at the reporting date:
 
$
9

 
$
9

 
$
(9
)
 
$
3

 
$
6

 
$
6

 
$
(23
)
 
$
(4
)


(1)
CenterPoint Energy and CERC did not have significant Level 3 sales or purchases during the three or six months ended June 30, 2019 or 2018.
Estimated fair value of financial instruments, debt instruments [Table Text Block]
The fair values of cash and cash equivalents, investments in debt and equity securities classified as “trading” and short-term borrowings are estimated to be approximately equivalent to carrying amounts and have been excluded from the table below. The carrying amounts of non-trading derivative assets and liabilities, CenterPoint Energy’s ZENS indexed debt securities derivative and hedging instruments are stated at fair value and are excluded from the table below.  The fair value of each debt instrument is determined by multiplying the principal amount of each debt instrument by a combination of historical trading prices and comparable issue data. These liabilities, which are not measured at fair value in the Registrants’ Condensed Consolidated Balance Sheets, but for which the fair value is disclosed, would be classified as Level 2 in the fair value hierarchy.
 
June 30, 2019
 
December 31, 2018
 
Carrying
Amount
 
Fair
Value
 
Carrying
Amount
 
Fair
Value
 
(in millions)
CenterPoint Energy
 
 
 
 
 
 
 
Long-term debt, including current maturities (1)
$
14,587

 
$
15,438

 
$
9,140

 
$
9,308

Houston Electric
 
 
 
 
 
 
 
Long-term debt, including current maturities (1)
$
5,165

 
$
5,583

 
$
4,717

 
$
4,770

CERC
 
 
 
 
 
 
 
Long-term debt, including current maturities
$
2,397

 
$
2,641

 
$
2,371

 
$
2,488


(1)
Includes Securitization Bonds debt.