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Derivative Instruments (Details)
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2017
USD ($)
Sep. 30, 2016
USD ($)
Sep. 30, 2017
USD ($)
Bcf
Sep. 30, 2016
USD ($)
Dec. 31, 2016
USD ($)
Bcf
Aug. 21, 2017
USD ($)
Derivatives, Fair Value [Line Items]            
Derivative Assets Fair Value $ 164,000,000   $ 164,000,000   $ 105,000,000 [1]  
Derivative Liabilities Fair Value 84,000,000   84,000,000   67,000,000 [1]  
Gross Amounts Offset in the Consolidated Balance Sheets 13,000,000   13,000,000   (14,000,000)  
Gain (loss) on derivative instruments not designated as hedging instruments 21,000,000 $ 18,000,000 71,000,000 $ 36,000,000    
Total fair value of the derivative instruments that contain credit risk contingency features that are in a net liability position 1,000,000   1,000,000   1,000,000  
The aggregate fair value of assets already posted as collateral 0   0   0  
Credit risk contingent feature assets 1,000,000   1,000,000   $ 0  
Gains (Losses) in Expense: Natural Gas [Member]            
Derivatives, Fair Value [Line Items]            
Change in unrealized gain (loss) on hedged item in fair value hedge 4,000,000 0 (10,000,000) 0    
Gain (loss) on fair value hedges recognized in earnings [2] 0 0 $ (2,000,000) 0    
Natural gas derivatives [Member]            
Derivatives, Fair Value [Line Items]            
Derivative gross volume notional amount (in Bcf) | Bcf     1,866   1,035  
Gross Amounts Recognized [3] 80,000,000   $ 80,000,000   $ 38,000,000  
Gross Amounts Offset in the Consolidated Balance Sheets 13,000,000   13,000,000   (14,000,000)  
Net Amount Presented in the Consolidated Balance Sheets [4] 93,000,000   93,000,000   24,000,000  
Natural gas derivatives [Member] | Current Assets [Member]            
Derivatives, Fair Value [Line Items]            
Gross Amounts Recognized [3] 97,000,000   97,000,000   81,000,000  
Gross Amounts Offset (33,000,000)   (33,000,000)   (30,000,000)  
Derivative Asset [4] 64,000,000   64,000,000   51,000,000  
Natural gas derivatives [Member] | Other Noncurrent Assets [Member]            
Derivatives, Fair Value [Line Items]            
Gross Amounts Recognized [3] 67,000,000   67,000,000   24,000,000  
Gross Amounts Offset (11,000,000)   (11,000,000)   (5,000,000)  
Derivative Asset [4] 56,000,000   56,000,000   19,000,000  
Natural gas derivatives [Member] | Current Liabilities [Member]            
Derivatives, Fair Value [Line Items]            
Gross Amounts Recognized [3] (57,000,000)   (57,000,000)   (57,000,000)  
Gross Amounts Offset 40,000,000   40,000,000   16,000,000  
Derivative Liability [4] (17,000,000)   (17,000,000)   (41,000,000)  
Natural gas derivatives [Member] | Other Noncurrent Liabilities [Member]            
Derivatives, Fair Value [Line Items]            
Gross Amounts Recognized [3] (27,000,000)   (27,000,000)   (10,000,000)  
Gross Amounts Offset 17,000,000   17,000,000   5,000,000  
Derivative Liability [4] (10,000,000)   (10,000,000)   (5,000,000)  
Natural gas derivatives [Member] | Gains (Losses) in Revenue [Member]            
Derivatives, Fair Value [Line Items]            
Gain (loss) on derivative instruments not designated as hedging instruments 30,000,000 31,000,000 162,000,000 1,000,000    
Natural gas derivatives [Member] | Gains (Losses) in Expense: Natural Gas [Member]            
Derivatives, Fair Value [Line Items]            
Change in unrealized gain (loss) on fair value hedging instruments (4,000,000) 0 8,000,000 0    
Gain (loss) on derivative instruments not designated as hedging instruments (9,000,000) $ (13,000,000) (91,000,000) $ 35,000,000    
Natural gas derivatives [Member] | Designated as Fair Value Hedge [Member] | Current Assets [Member]            
Derivatives, Fair Value [Line Items]            
Derivative Assets Fair Value [5],[6],[7] 0   0      
Derivative Liabilities Fair Value [5],[6],[7] 0   0      
Natural gas derivatives [Member] | Designated as Fair Value Hedge [Member] | Current Liabilities [Member]            
Derivatives, Fair Value [Line Items]            
Derivative Assets Fair Value [5],[6],[7] 5,000,000   5,000,000      
Derivative Liabilities Fair Value [5],[6],[7] 0   0      
Natural gas derivatives [Member] | Not Designated as Hedging Instrument [Member] | Current Assets [Member]            
Derivatives, Fair Value [Line Items]            
Derivative Assets Fair Value [5] 65,000,000 [6],[7]   65,000,000 [6],[7]   79,000,000 [8],[9]  
Derivative Liabilities Fair Value [5] 2,000,000 [6],[7]   2,000,000 [6],[7]   14,000,000 [8],[9]  
Natural gas derivatives [Member] | Not Designated as Hedging Instrument [Member] | Other Noncurrent Assets [Member]            
Derivatives, Fair Value [Line Items]            
Derivative Assets Fair Value [5] 58,000,000 [6],[7]   58,000,000 [6],[7]   24,000,000 [8],[9]  
Derivative Liabilities Fair Value [5] 2,000,000 [6],[7]   2,000,000 [6],[7]   5,000,000 [8],[9]  
Natural gas derivatives [Member] | Not Designated as Hedging Instrument [Member] | Current Liabilities [Member]            
Derivatives, Fair Value [Line Items]            
Derivative Assets Fair Value [5] 27,000,000 [6],[7]   27,000,000 [6],[7]   2,000,000 [8],[9]  
Derivative Liabilities Fair Value [5] 55,000,000 [6],[7]   55,000,000 [6],[7]   43,000,000 [8],[9]  
Natural gas derivatives [Member] | Not Designated as Hedging Instrument [Member] | Other Noncurrent Liabilities [Member]            
Derivatives, Fair Value [Line Items]            
Derivative Assets Fair Value [5] 9,000,000 [6],[7]   9,000,000 [6],[7]   0 [8],[9]  
Derivative Liabilities Fair Value [5] 25,000,000 [6],[7]   $ 25,000,000 [6],[7]   $ 5,000,000 [8],[9]  
Natural gas derivatives [Member] | Long [Member]            
Derivatives, Fair Value [Line Items]            
Derivative gross volume notional amount (in Bcf) | Bcf     46   59  
Natural Gas Distribution [Member] | 2017to2018 [Member]            
Derivatives, Fair Value [Line Items]            
Weather hedge bilateral cap amount     $ 8,000,000      
August [Member] | Treasury Lock [Member]            
Derivatives, Fair Value [Line Items]            
Aggregate notional amount $ 150,000,000   150,000,000      
Effective portion of realized losses     $ 1,500,000      
Senior Notes [Member]            
Derivatives, Fair Value [Line Items]            
Principal amount of debt issued           $ 300,000,000
[1] No derivatives were designated as fair value hedges as of December 31, 2016.
[2] Hedge ineffectiveness results from the basis ineffectiveness discussed above, and excludes the impact to natural gas expense from timing ineffectiveness. Timing ineffectiveness arises due to changes in the difference between the spot price and the futures price, as well as the difference between the timing of the settlement of the futures and the valuation of the underlying physical commodity. As the commodity contract nears the settlement date, spot-to-forward price differences should converge, which should reduce or eliminate the impact of this ineffectiveness on natural gas expense.
[3] Gross amounts recognized include some derivative assets and liabilities that are not subject to master netting arrangements.
[4] The derivative assets and liabilities on the Condensed Consolidated Balance Sheets exclude accounts receivable or accounts payable that, should they exist, could be used as offsets to these balances in the event of a default.
[5] Derivative Assets and Derivative Liabilities include no material amounts related to physical forward transactions with Enable.
[6] Natural gas contracts are presented on a net basis in the Condensed Consolidated Balance Sheets as they are subject to master netting arrangements. This netting applies to all undisputed amounts due or past due and causes derivative assets (liabilities) to be ultimately presented net in a liability (asset) account within the Condensed Consolidated Balance Sheets. The net of total non-trading natural gas derivative assets and liabilities was a $93 million asset as shown on CERC’s Condensed Consolidated Balance Sheets (and as detailed in the table below), and was comprised of the natural gas contracts derivative assets and liabilities separately shown above, impacted by collateral netting of $13 million.
[7] The fair value shown for natural gas contracts is comprised of derivative gross volumes totaling 1,866 Bcf or a net 46 Bcf long position. Certain natural gas contracts hedge basis risk only and lack a fixed price exposure.
[8] Natural gas contracts are presented on a net basis in the Condensed Consolidated Balance Sheets as they are subject to master netting arrangements. This netting applies to all undisputed amounts due or past due and causes derivative assets (liabilities) to be ultimately presented net in a liability (asset) account within the Condensed Consolidated Balance Sheets. The net of total non-trading natural gas derivative assets and liabilities was a $24 million asset as shown on CERC’s Condensed Consolidated Balance Sheets (and as detailed in the table below), and was comprised of the natural gas contracts derivative assets and liabilities separately shown above, impacted by collateral netting of $14 million.
[9] The fair value shown for natural gas contracts is comprised of derivative gross volumes totaling 1,035 Bcf or a net 59 Bcf long position.