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Derivatives and Hedging (Details) (USD $)
3 Months Ended9 Months Ended
Sep. 30, 2011
Sep. 30, 2010
Sep. 30, 2011
Sep. 30, 2010
Dec. 31, 2010
Commodity:     
Power (In MWHs)730,000,000 730,000,000 652,000,000
Coal (In Tons)35,000,000 35,000,000 63,000,000
Natural Gas (In MMBtus)92,000,000 92,000,000 94,000,000
Heating Oil and Gasoline (In Gallons)7,000,000 7,000,000 6,000,000
Interest Rate$ 232,000,000 $ 232,000,000 $ 171,000,000
Interest Rate and Foreign Currency614,000,000 614,000,000 907,000,000
Fair Value of Derivative Instruments     
Current Risk Management Assets164,000,000 164,000,000 232,000,000
Long-term Risk Management Assets316,000,000 316,000,000 410,000,000
Total Assets480,000,000 480,000,000 642,000,000
Current Risk Management Liabilities113,000,000 113,000,000 129,000,000
Long-term Risk Management Liabilities133,000,000 133,000,000 141,000,000
Total Liabilities246,000,000 246,000,000 270,000,000
Total MTM Derivative Contract Net Assets (Liabilities)234,000,000 234,000,000 372,000,000
Amount of Gain (Loss) Recognized on Risk Management Contracts     
Amount of Gain (Loss) Recognized on Risk Management Contracts9,000,00021,000,00072,000,00099,000,000 
Total Accumulated Other Comprehensive Income (Loss) Activity for Cash Flow Hedges     
Beginning Balance in AOCI17,000,000(13,000,000)11,000,000(15,000,000) 
Changes in Fair Value Recognized in AOCI(19,000,000)(3,000,000)(15,000,000)(3,000,000) 
Amount of (Gain) or Loss Reclassified from AOCI to Income Statement/within Balance Sheet:     
Ending Balance in AOCI(3,000,000)(13,000,000)(3,000,000)(13,000,000) 
Impact of Cash Flow Hedges on Balance Sheet     
Hedging Assets23,000,000[1] 23,000,000[1] 38,000,000[1]
Hedging Liabilities38,000,000[1] 38,000,000[1] 6,000,000[1]
AOCI Gain (Loss) Net of Tax(3,000,000)(13,000,000)(3,000,000)(13,000,000) 
Portion Expected to be Reclassified to Net Income During the Next Twelve Months3,000,000 3,000,000 1,000,000
Collateral Triggering Events [Abstract]     
Liabilities for Derivative Contracts with Credit Downgrade Triggers31,000,000 31,000,000 20,000,000
Amount of Collateral AEP Subsidiaries Would Have Been Required to Post59,000,000 59,000,000 45,000,000
Amount Attributable to RTO and ISO Activities55,000,000 55,000,000 44,000,000
Liabilities for Contracts with Cross Default Provisions Prior to Contractural Netting Arrangements339,000,000 339,000,000 401,000,000
Posted Cash Collateral Related to Contracts with Cross Default Provisions21,000,000 21,000,000 81,000,000
Additional Settlement Liability if Cross Default Provision is Triggered202,000,000 202,000,000 213,000,000
Derivatives and Hedging (Textuals) [Abstract]     
Cash Collateral Received Netted Against Risk Management Assets15,000,000 15,000,000 8,000,000
Cash Collateral Paid Netted Against Risk Management Liabilities45,000,000 45,000,000 109,000,000
Maximum Length of Time for Hedging Exposure (in months)  33  
Gain on Fair Value Hedging Instrument1,000,0003,000,0003,000,0007,000,000 
Loss on Fair Value Portion of Long Term Debt3,000,0003,000,0006,000,0007,000,000 
Other Revenue [Member]
     
Amount of Gain (Loss) Recognized on Risk Management Contracts     
Amount of Gain (Loss) Recognized on Risk Management Contracts6,000,000(4,000,000)21,000,0005,000,000 
Amount of (Gain) or Loss Reclassified from AOCI to Income Statement/within Balance Sheet:     
Amount of (Gain) or Loss Reclassified from AOCI to Income Statement/within Balance Sheet(1,000,000)(1,000,000)(3,000,000)(4,000,000) 
Other Revenue [Member] | Interest Rate and Foreign Currency [Member]
     
Amount of (Gain) or Loss Reclassified from AOCI to Income Statement/within Balance Sheet:     
Amount of (Gain) or Loss Reclassified from AOCI to Income Statement/within Balance Sheet0000 
Other Revenue [Member] | Commodity [Member]
     
Amount of (Gain) or Loss Reclassified from AOCI to Income Statement/within Balance Sheet:     
Amount of (Gain) or Loss Reclassified from AOCI to Income Statement/within Balance Sheet(1,000,000)(1,000,000)(3,000,000)(4,000,000) 
Interest Expense [Member]
     
Amount of (Gain) or Loss Reclassified from AOCI to Income Statement/within Balance Sheet:     
Amount of (Gain) or Loss Reclassified from AOCI to Income Statement/within Balance Sheet1,000,0001,000,0003,000,0003,000,000 
Interest Expense [Member] | Interest Rate and Foreign Currency [Member]
     
Amount of (Gain) or Loss Reclassified from AOCI to Income Statement/within Balance Sheet:     
Amount of (Gain) or Loss Reclassified from AOCI to Income Statement/within Balance Sheet1,000,0001,000,0003,000,0003,000,000 
Interest Expense [Member] | Commodity [Member]
     
Amount of (Gain) or Loss Reclassified from AOCI to Income Statement/within Balance Sheet:     
Amount of (Gain) or Loss Reclassified from AOCI to Income Statement/within Balance Sheet0000 
Purchased Electricity for Resale [Member]
     
Amount of (Gain) or Loss Reclassified from AOCI to Income Statement/within Balance Sheet:     
Amount of (Gain) or Loss Reclassified from AOCI to Income Statement/within Balance Sheet(2,000,000)1,000,000(3,000,000)3,000,000 
Purchased Electricity for Resale [Member] | Interest Rate and Foreign Currency [Member]
     
Amount of (Gain) or Loss Reclassified from AOCI to Income Statement/within Balance Sheet:     
Amount of (Gain) or Loss Reclassified from AOCI to Income Statement/within Balance Sheet0000 
Purchased Electricity for Resale [Member] | Commodity [Member]
     
Amount of (Gain) or Loss Reclassified from AOCI to Income Statement/within Balance Sheet:     
Amount of (Gain) or Loss Reclassified from AOCI to Income Statement/within Balance Sheet(2,000,000)1,000,000(3,000,000)3,000,000 
Utility Operations Revenue [Member]
     
Amount of Gain (Loss) Recognized on Risk Management Contracts     
Amount of Gain (Loss) Recognized on Risk Management Contracts8,000,00024,000,00046,000,00069,000,000 
Amount of (Gain) or Loss Reclassified from AOCI to Income Statement/within Balance Sheet:     
Amount of (Gain) or Loss Reclassified from AOCI to Income Statement/within Balance Sheet1,000,0001,000,0003,000,0001,000,000 
Utility Operations Revenue [Member] | Interest Rate and Foreign Currency [Member]
     
Amount of (Gain) or Loss Reclassified from AOCI to Income Statement/within Balance Sheet:     
Amount of (Gain) or Loss Reclassified from AOCI to Income Statement/within Balance Sheet0000 
Utility Operations Revenue [Member] | Commodity [Member]
     
Amount of (Gain) or Loss Reclassified from AOCI to Income Statement/within Balance Sheet:     
Amount of (Gain) or Loss Reclassified from AOCI to Income Statement/within Balance Sheet1,000,0001,000,0003,000,0001,000,000 
Regulatory Assets [Member]
     
Amount of Gain (Loss) Recognized on Risk Management Contracts     
Amount of Gain (Loss) Recognized on Risk Management Contracts(3,000,000)[2](6,000,000)[2](3,000,000)[2](9,000,000)[2] 
Amount of (Gain) or Loss Reclassified from AOCI to Income Statement/within Balance Sheet:     
Amount of (Gain) or Loss Reclassified from AOCI to Income Statement/within Balance Sheet0[2]1,000,000[2]1,000,000[2]2,000,000[2] 
Regulatory Assets [Member] | Interest Rate and Foreign Currency [Member]
     
Amount of (Gain) or Loss Reclassified from AOCI to Income Statement/within Balance Sheet:     
Amount of (Gain) or Loss Reclassified from AOCI to Income Statement/within Balance Sheet0[2]0[2]0[2]0[2] 
Regulatory Assets [Member] | Commodity [Member]
     
Amount of (Gain) or Loss Reclassified from AOCI to Income Statement/within Balance Sheet:     
Amount of (Gain) or Loss Reclassified from AOCI to Income Statement/within Balance Sheet0[2]1,000,000[2]1,000,000[2]2,000,000[2] 
Regulatory Liabilities [Member]
     
Amount of Gain (Loss) Recognized on Risk Management Contracts     
Amount of Gain (Loss) Recognized on Risk Management Contracts(2,000,000)[2]7,000,000[2]8,000,000[2]34,000,000[2] 
Amount of (Gain) or Loss Reclassified from AOCI to Income Statement/within Balance Sheet:     
Amount of (Gain) or Loss Reclassified from AOCI to Income Statement/within Balance Sheet0[2]0[2]0[2]0[2] 
Regulatory Liabilities [Member] | Interest Rate and Foreign Currency [Member]
     
Amount of (Gain) or Loss Reclassified from AOCI to Income Statement/within Balance Sheet:     
Amount of (Gain) or Loss Reclassified from AOCI to Income Statement/within Balance Sheet0[2]0[2]0[2]0[2] 
Regulatory Liabilities [Member] | Commodity [Member]
     
Amount of (Gain) or Loss Reclassified from AOCI to Income Statement/within Balance Sheet:     
Amount of (Gain) or Loss Reclassified from AOCI to Income Statement/within Balance Sheet0[2]0[2]0[2]0[2] 
Other [Member]
     
Fair Value of Derivative Instruments     
Current Risk Management Assets(413,000,000)[3] (413,000,000)[3] (839,000,000)[3]
Long-term Risk Management Assets(160,000,000)[3] (160,000,000)[3] (150,000,000)[3]
Total Assets(573,000,000)[3] (573,000,000)[3] (989,000,000)[3]
Current Risk Management Liabilities(444,000,000)[3] (444,000,000)[3] (881,000,000)[3]
Long-term Risk Management Liabilities(193,000,000)[3] (193,000,000)[3] (255,000,000)[3]
Total Liabilities(637,000,000)[3] (637,000,000)[3] (1,136,000,000)[3]
Total MTM Derivative Contract Net Assets (Liabilities)64,000,000[3] 64,000,000[3] 147,000,000[3]
Interest Rate and Foreign Currency [Member]
     
Total Accumulated Other Comprehensive Income (Loss) Activity for Cash Flow Hedges     
Beginning Balance in AOCI5,000,000(15,000,000)4,000,000(13,000,000) 
Changes in Fair Value Recognized in AOCI(21,000,000)(1,000,000)(22,000,000)(5,000,000) 
Amount of (Gain) or Loss Reclassified from AOCI to Income Statement/within Balance Sheet:     
Ending Balance in AOCI(15,000,000)(15,000,000)(15,000,000)(15,000,000) 
Impact of Cash Flow Hedges on Balance Sheet     
Hedging Assets0[1] 0[1] 25,000,000[1]
Hedging Liabilities34,000,000[1] 34,000,000[1] 4,000,000[1]
AOCI Gain (Loss) Net of Tax(15,000,000)(15,000,000)(15,000,000)(15,000,000) 
Portion Expected to be Reclassified to Net Income During the Next Twelve Months(2,000,000) (2,000,000) (2,000,000)
Interest Rate and Foreign Currency [Member] | Hedging Contracts [Member]
     
Fair Value of Derivative Instruments     
Current Risk Management Assets0[4] 0[4] 30,000,000[4]
Long-term Risk Management Assets0[4] 0[4] 2,000,000[4]
Total Assets0[4] 0[4] 32,000,000[4]
Current Risk Management Liabilities17,000,000[4] 17,000,000[4] 2,000,000[4]
Long-term Risk Management Liabilities17,000,000[4] 17,000,000[4] 3,000,000[4]
Total Liabilities34,000,000[4] 34,000,000[4] 5,000,000[4]
Total MTM Derivative Contract Net Assets (Liabilities)(34,000,000)[4] (34,000,000)[4] 27,000,000[4]
Commodity [Member]
     
Fair Value of Derivative Instruments     
Current Risk Management Assets557,000,000[4] 557,000,000[4] 1,023,000,000[4]
Long-term Risk Management Assets460,000,000[4] 460,000,000[4] 546,000,000[4]
Total Assets1,017,000,000[4] 1,017,000,000[4] 1,569,000,000[4]
Current Risk Management Liabilities528,000,000[4] 528,000,000[4] 995,000,000[4]
Long-term Risk Management Liabilities304,000,000[4] 304,000,000[4] 387,000,000[4]
Total Liabilities832,000,000[4] 832,000,000[4] 1,382,000,000[4]
Total MTM Derivative Contract Net Assets (Liabilities)185,000,000[4] 185,000,000[4] 187,000,000[4]
Total Accumulated Other Comprehensive Income (Loss) Activity for Cash Flow Hedges     
Beginning Balance in AOCI12,000,0002,000,0007,000,000(2,000,000) 
Changes in Fair Value Recognized in AOCI2,000,000(2,000,000)7,000,0002,000,000 
Amount of (Gain) or Loss Reclassified from AOCI to Income Statement/within Balance Sheet:     
Ending Balance in AOCI12,000,0002,000,00012,000,0002,000,000 
Impact of Cash Flow Hedges on Balance Sheet     
Hedging Assets23,000,000[1] 23,000,000[1] 13,000,000[1]
Hedging Liabilities4,000,000[1] 4,000,000[1] 2,000,000[1]
AOCI Gain (Loss) Net of Tax12,000,0002,000,00012,000,0002,000,000 
Portion Expected to be Reclassified to Net Income During the Next Twelve Months5,000,000 5,000,000 3,000,000
Commodity [Member] | Hedging Contracts [Member]
     
Fair Value of Derivative Instruments     
Current Risk Management Assets20,000,000[4] 20,000,000[4] 18,000,000[4]
Long-term Risk Management Assets16,000,000[4] 16,000,000[4] 12,000,000[4]
Total Assets36,000,000[4] 36,000,000[4] 30,000,000[4]
Current Risk Management Liabilities12,000,000[4] 12,000,000[4] 13,000,000[4]
Long-term Risk Management Liabilities5,000,000[4] 5,000,000[4] 6,000,000[4]
Total Liabilities17,000,000[4] 17,000,000[4] 19,000,000[4]
Total MTM Derivative Contract Net Assets (Liabilities)19,000,000[4] 19,000,000[4] 11,000,000[4]
Risk Management Commodity Contracts [Member]
     
Fair Value of Derivative Instruments     
Total Assets423,000,000[5],[6] 423,000,000[5],[6] 551,000,000[5],[7]
Total Liabilities208,000,000[5],[6] 208,000,000[5],[6] 263,000,000[5],[7]
Fair Value Hedges [Member]
     
Fair Value of Derivative Instruments     
Total Assets0 0 7,000,000
Total Liabilities    $ 1,000,000
[1]Hedging Assets and Hedging Liabilities are included in Risk Management Assets and Liabilities on the condensed balance sheets.
[2]Represents realized and unrealized gains and losses subject to regulatory accounting treatment recorded as either current or noncurrent on the condensed balance sheets.
[3]Amounts include counterparty netting of risk management and hedging contracts and associated cash collateral in accordance with the accounting guidance for "Derivatives and Hedging." Amounts also include de-designated risk management contracts.
[4]Derivative instruments within these categories are reported gross. These instruments are subject to master netting agreements and are presented on the condensed balance sheets on a net basis in accordance with the accounting guidance for "Derivatives and Hedging."
[5]Amounts in ''Other'' column primarily represent counterparty netting of risk management and hedging contracts and associated cash collateral under the accounting guidance for ''Derivatives and Hedging.''
[6]The September 30, 2011 maturity of the net fair value of risk management contracts prior to cash collateral, assets/(liabilities), is as follows: Level 1 matures $0 in 2011, $6 million in periods 2012-2014 and ($6) million in periods 2015-2016; Level 2 matures $3 million in 2011, $80 million in periods 2012-2014, $22 million in periods 2015-2016 and $16 million in periods 2017-2028; Level 3 matures $5 million in 2011, $17 million in periods 2012-2014, $13 million in periods 2015-2016 and $29 million in periods 2017-2028. Risk management commodity contracts are substantially comprised of power contracts.
[7]The December 31, 2010 maturity of the net fair value of risk management contracts prior to cash collateral, assets/(liabilities), is as follows: Level 1 matures ($2) million in 2011, $2 million in periods 2012-2014 and ($5) million in periods 2015-2018; Level 2 matures $13 million in 2011, $66 million in periods 2012-2014, $12 million in periods 2015-2016 and $16 million in periods 2017-2028; Level 3 matures $18 million in 2011, $24 million in periods 2012-2014, $16 million in periods 2015-2016 and $27 million in periods 2017-2028. Risk management commodity contracts are substantially comprised of power contracts.