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Derivative Instruments and Hedging Activities (Tables) | 3 Months Ended
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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 |

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- Definition Tabular disclosure of pre-tax gains (losses) of economic activity related to price and volume risk derivative instruments not designated as hedging instruments, the ineffective portion of qualifying cash flow hedges, and the entire change in fair value of certain cash flow hedges that fail retrospective effectiveness testing. + References No definition available. + Details
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- Definition Tabular disclosure of derivative and other financial assets that are subject to offsetting, including master netting arrangements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225877-175312 + Details
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- Definition Tabular disclosure of the location and amount of derivative instruments and nonderivative instruments designated as hedging instruments reported before netting adjustments, and the amount of gain (loss) on derivative instruments and nonderivative instruments designated and qualified as hedging instruments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -URI http://asc.fasb.org/extlink&oid=56946850&loc=SL5624171-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=56946850&loc=SL5618551-113959 + Details
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- Definition Tabular disclosure of pertinent information about a derivative or group of derivatives on a disaggregated basis, such as for individual instruments, or small groups of similar instruments. May include a combination of the type of instrument, risks being hedged, notional amount, hedge designation, related hedged item, inception date, maturity date, or other relevant item. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=56946850&loc=d3e41641-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -URI http://asc.fasb.org/extlink&oid=56946850&loc=SL5624163-113959 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=56946850&loc=d3e41678-113959 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=56946850&loc=d3e41638-113959 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1B -URI http://asc.fasb.org/extlink&oid=56946850&loc=SL5580258-113959 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=56946850&loc=SL5579245-113959 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -URI http://asc.fasb.org/extlink&oid=56946850&loc=SL5624171-113959 Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 25 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6886632&loc=d3e76258-113986 Reference 9: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=56946850&loc=SL5579240-113959 Reference 10: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=56946850&loc=d3e41620-113959 Reference 11: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(n)(2)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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