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Fair Value Measurements (Tables)
 12 Months Ended
Dec. 31, 2016
Fair Value Disclosures [Abstract]  
Fair Value, Assets Measured on Recurring Basis [Table Text Block]
The following tables present information about CERC’s assets and liabilities (including derivatives that are presented net) measured at fair value on a recurring basis and indicate the fair value hierarchy of the valuation techniques utilized by CERC to determine such fair value.
 
December 31, 2016
 
Quoted Prices in
Active Markets
for Identical Assets
(Level 1)
 
Significant Other
Observable
Inputs
(Level 2)
 
Significant
Unobservable
Inputs
(Level 3)
 
Netting
Adjustments (1)
 
Balance
 
(in millions)
Assets
 
 
 
 
 
 
 
 
 
Corporate equities
$
3

 
$
—

 
$
—

 
$
—

 
$
3

Investments, including money
market funds (2)
10

 
—

 
—

 
—

 
10

Natural gas derivatives (3)
11

 
74

 
20

 
(35
)
 
70

Total assets
$
24

 
$
74

 
$
20

 
$
(35
)
 
$
83

Liabilities
 

 
 

 
 

 
 

 
 

Natural gas derivatives (3)
$
4

 
$
56

 
$
7

 
$
(21
)
 
$
46

Total liabilities
$
4

 
$
56

 
$
7

 
$
(21
)
 
$
46


(1)
Amounts represent the impact of legally enforceable master netting arrangements that allow CERC to settle positive and negative positions and also include cash collateral of $14 million held by CES from the same counterparties.

(2)
Amounts are included in Other Assets in the Consolidated Balance Sheets.
 
(3)
Natural gas derivatives include no material amounts related to physical forward transactions with Enable.
 
December 31, 2015
 
Quoted Prices in
Active Markets
for Identical Assets
(Level 1)
 
Significant Other
Observable
Inputs
(Level 2)
 
Significant
Unobservable
Inputs
(Level 3)
 
Netting
Adjustments (1)
 
Balance
 
(in millions)
Assets
 
 
 
 
 
 
 
 
 
Corporate equities
$
2

 
$
—

 
$
—

 
$
—

 
$
2

Investments, including money
market funds (2)
11

 
—

 
—

 
—

 
11

Natural gas derivatives (3)
4

 
115

 
21

 
(15
)
 
125

Total assets
$
17

 
$
115

 
$
21

 
$
(15
)
 
$
138

Liabilities
 

 
 

 
 

 
 

 
 

Natural gas derivatives (3)
$
13

 
$
65

 
$
9

 
$
(71
)
 
$
16

Total liabilities
$
13

 
$
65

 
$
9

 
$
(71
)
 
$
16


(1)
Amounts represent the impact of legally enforceable master netting arrangements that allow CERC to settle positive and negative positions and also include cash collateral of $56 million posted with the same counterparties.

(2)
Amounts are included in Other Assets in the Consolidated Balance Sheets.

(3)
Natural gas derivatives include no material amounts related to physical forward transactions with Enable.
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [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 CERC has utilized Level 3 inputs to determine fair value:
 
Fair Value Measurements Using Significant
 Unobservable Inputs (Level 3)
 
Derivative assets and liabilities, net
 
Year Ended December 31,
 
2016
 
2015
 
2014
 
(in millions)
Beginning balance
$
12

 
$
17

 
$
3

Purchases
12

 
—

 
—

Total gains
12

 
7

 
14

Total settlements
(27
)
 
(12
)
 
1

Transfers out of Level 3
(1
)
 
(1
)
 
—

Transfers into Level 3
5

 
1

 
(1
)
Ending balance (1)
$
13

 
$
12

 
$
17

The amount of total gains for the period included in earnings
attributable to the change in unrealized gains or losses relating
to assets still held at the reporting date
$
11

 
$
6

 
$
16



(1)
During 2016, 2015 and 2014, CERC did not have significant Level 3 sales.
Fair Value, by Balance Sheet Grouping [Table Text Block]
The fair values of cash and cash equivalents 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 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 the market price. These assets and liabilities, which are not measured at fair value in the Consolidated Balance Sheets but for which the fair value is disclosed, would be classified as Level 1 or Level 2 in the fair value hierarchy.
 
December 31, 2016
 
December 31, 2015
 
Carrying
Amount
 
Fair
Value
 
Carrying
Amount
 
Fair
Value
 
(in millions)
Financial assets:
 
 
 
 
 
 
 
Notes receivable - affiliated companies
$
—

 
$
—

 
$
363

 
$
356

Financial liabilities:
 
 
 
 
 
 
 
Long-term debt
$
2,375

 
$
2,551

 
$
2,341

 
$
2,539