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Derivative Instruments and Hedging Activities (Tables)
 3 Months Ended
Mar. 31, 2016
Derivative Instruments and Hedging Activities Disclosure [Abstract]  
Commodity Price Risk (Non-trading) - Economic Activity - Pre-tax Gains (Losses) Associated with Economic Activity
The unrealized gains (losses) for economic activity for the periods ended March 31 were as follows.
 
Three Months
 
2016
 
2015
Operating Revenues
 
 
 
Wholesale energy
$
60

 
$
19

Retail energy
1

 
(13
)
Operating Expenses

 

Fuel and energy purchases
17

 
34
Commodity Volumes - Volumes of Derivative (Sales) Purchase Contracts
At March 31, 2016, the net volumes of derivative (sales)/purchase contracts used in support of the various strategies discussed above were as follows.
 
 
 
 
Volumes (a)
Commodity
 
Unit of Measure
 
2016 (b)
 
2017
 
2018
 
Thereafter
Power
 
MWh
 
(29,118,538
)
 
(10,103,077
)
 
(1,574,972
)
 
(719,594
)
Capacity
 
MW-Month
 
(5,413
)
 
(3,750
)
 
(3,746
)
 
(1,559
)
Gas
 
MMBtu
 
106,721,381

 
16,519,903

 
14,714,804

 
2,518,280

FTRs
 
MW-Month
 
5,608

 
200

 
—

 
—

Oil
 
Barrels
 
48,409

 
—

 
—

 
—

CRRs
 
MWh
 
1,790,525

 
641,989

 
—

 
—

Emission Allowances
 
Tons
 
3,149,720

 
—

 
—

 
—


(a)
Volumes for option contracts factor in the probability of an option being exercised and may be less than the notional amount of the option.   
(b)
Represents balance of the current year.
Fair Value and Balance Sheet Location of Derivative Instruments
The following table presents the fair value and location of commodity derivative instruments not designated as hedging instruments recorded on the Balance Sheets. 
 
 
March 31, 2016
 
December 31, 2015
 
 
Assets
 
Liabilities
 
Assets
 
Liabilities
Current:
 
 
 
 
 
 
 
 
  Price Risk Management Assets/Liabilities
 
$
680

 
$
492

 
$
562

 
$
431

Noncurrent:
 
 
 
 
 
 
 
 
  Price Risk Management Assets/Liabilities
 
160

 
127

 
131

 
108

Total derivatives
 
$
840

 
$
619

 
$
693

 
$
539
Pre-tax Gain (Loss) on Derivative Instruments Recognized in Income or on the Balance Sheet
The following tables present the pre-tax effect of derivative instruments recognized in income for the period ended March 31, 2016.
 
 
 
 
Gain (Loss) Reclassified from AOCI into Income
(Effective Portion)
Derivative
Relationships
 
Location of Gain (Loss) Recognized in Income on Derivative
 
Three Months
Cash Flow Hedges:
 
 
 
 
Commodity contracts
 
Wholesale energy
 
$
(3
)
 
 
Fuel and energy purchases
 
8

 
 
Total
 
$
5


Derivatives Not Designated as
Hedging Instruments
 
Location of Gain (Loss) Recognized in
Income on Derivative
 
Three Months
Commodity contracts
 
Wholesale energy
 
$
247

 
 
Retail energy
 
19

 
 
Fuel and energy purchases
 
(61
)
 
 
Total
 
$
205

                   
The following tables present the pre-tax effect of derivative instruments recognized in income for the period ended March 31, 2015.      
 
 
 
 
Gain (Loss) Reclassified from AOCI into Income
(Effective Portion)
Derivative
Relationships
 
Location of Gain (Loss) Recognized in Income on Derivative
 
Three Months
Cash Flow Hedges:
 
 
 
 
     Commodity contracts
 
Wholesale energy
 
$
(2
)
 
 
Fuel and energy purchases
 
8

 
 
Depreciation
 
1

 
 
 Total
 
$
7


Derivatives Not Designated as
Hedging Instruments
 
Location of Gain (Loss) Recognized in
Income on Derivative
 
Three Months
Commodity contracts
 
Wholesale energy
 
$
(84
)
 
 
Retail energy
 
(39
)
 
 
Fuel and energy purchases
 
48

 
 
Total
 
$
(75
)
Derivative Positions Eligible for Offset with Related Cash Collateral
The table below summarizes the energy commodities derivative positions presented in the balance sheets where a right of setoff exists under these arrangements and related cash collateral received or pledged.       
      
 
 
 
 
Assets
 
Liabilities
 
 
 
 
 
 
Eligible for Offset
 
 
 
 
 
Eligible for Offset
 
 
 
 
 
 
Gross
 
Derivative
Instruments
 
Cash Collateral Received
 
Net
 
Gross
 
Derivative
Instruments
 
Cash Collateral Pledged
 
Net
March 31, 2016
 
$
840

 
$
523

 
$
88

 
$
229

 
$
619

 
$
523

 
$
21

 
$
75

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
December 31, 2015
 
$
693

 
$
437

 
$
74

 
$
182

 
$
539

 
$
437

 
$
30

 
$
72
Derivative Positions Eligible for Offset with Related Cash Collateral
The table below summarizes the energy commodities derivative positions presented in the balance sheets where a right of setoff exists under these arrangements and related cash collateral received or pledged.       
      
 
 
 
 
Assets
 
Liabilities
 
 
 
 
 
 
Eligible for Offset
 
 
 
 
 
Eligible for Offset
 
 
 
 
 
 
Gross
 
Derivative
Instruments
 
Cash Collateral Received
 
Net
 
Gross
 
Derivative
Instruments
 
Cash Collateral Pledged
 
Net
March 31, 2016
 
$
840

 
$
523

 
$
88

 
$
229

 
$
619

 
$
523

 
$
21

 
$
75

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
December 31, 2015
 
$
693

 
$
437

 
$
74

 
$
182

 
$
539

 
$
437

 
$
30

 
$
72