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Fair Value Measurements (Tables)
 6 Months Ended
Jun. 30, 2013
Book Values and Fair Values of Long-term Debt
   June 30, 2013 December 31, 2012
   Book Value Fair Value Book Value Fair Value
   (in millions)
 Long-term Debt $ 17,618 $ 19,509 $ 17,757 $ 20,907
Other Temporary Investments
     June 30, 2013 
       Gross Gross Estimated 
        Unrealized Unrealized  Fair
 Other Temporary Investments Cost Gains Losses Value
     (in millions) 
 Restricted Cash (a) $ 204 $ - $ - $ 204 
 Fixed Income Securities:             
  Mutual Funds   76   -   -   76 
 Equity Securities - Mutual Funds   10   8   -   18 
 Total Other Temporary Investments $ 290 $ 8 $ - $ 298 
                 
     December 31, 2012 
       Gross Gross Estimated 
        Unrealized Unrealized  Fair 
 Other Temporary Investments Cost Gains Losses Value 
     (in millions) 
 Restricted Cash (a) $ 241 $ - $ - $ 241 
 Fixed Income Securities:             
  Mutual Funds   65   2   -   67 
 Equity Securities - Mutual Funds   10   6   -   16 
 Total Other Temporary Investments $ 316 $ 8 $ - $ 324 
                 
 (a)Primarily represents amounts held for the repayment of debt.
Debt and Equity Securities Within Other Temporary Investments
  Three Months Ended June 30, Six Months Ended June 30,
  2013 2012 2013 2012
  (in millions)
 Proceeds from Investment Sales$ - $ - $ - $ -
 Purchases of Investments  -   1   11   1
 Gross Realized Gains on Investment Sales  -   -   -   -
 Gross Realized Losses on Investment Sales  -   -   -   -
Nuclear Trust Fund Investments
    June 30, 2013 December 31, 2012
    Estimated Gross Other-Than-  Estimated Gross Other-Than-
   FairUnrealizedTemporaryFairUnrealizedTemporary
   ValueGainsImpairmentsValueGainsImpairments
    (in millions)
 Cash and Cash Equivalents $ 14 $ - $ - $ 17 $ - $ -
 Fixed Income Securities:                  
  United States Government   605   37   (2)   648   58   (1)
  Corporate Debt   35   3   (2)   35   5   (1)
  State and Local Government   262   -   (3)   270   1   (1)
   Subtotal Fixed Income Securities  902   40   (7)   953   64   (3)
 Equity Securities - Domestic   875   373   (82)   736   285   (77)
 Spent Nuclear Fuel and                  
  Decommissioning Trusts $ 1,791 $ 413 $ (89) $ 1,706 $ 349 $ (80)
Securities Activity Within the Decommissioning and SNF Trusts
  Three Months Ended June 30, Six Months Ended June 30,
  2013 2012 2013 2012
  (in millions)
 Proceeds from Investment Sales$ 217 $ 183 $ 385 $ 517
 Purchases of Investments  227   192   412   545
 Gross Realized Gains on Investment Sales  9   3   12   5
 Gross Realized Losses on Investment Sales  8   1   10   2
Contractual Maturities, Fair Value of Debt Securities in Nuclear Trusts
  Fair Value of 
  Fixed Income 
  Securities 
  (in millions) 
 Within 1 year$ 79 
 1 year – 5 years  340 
 5 years – 10 years  238 
 After 10 years  245 
 Total$ 902 
Fair Value, Assets and Liabilities Measured on Recurring Basis
Assets and Liabilities Measured at Fair Value on a Recurring Basis
June 30, 2013
            
   Level 1 Level 2 Level 3 Other Total
                 
Assets:(in millions)
                 
Cash and Cash Equivalents (a)$ 10 $ 1 $ - $ 106 $ 117
                 
Other Temporary Investments              
Restricted Cash (a)  186   6   -   12   204
Fixed Income Securities:              
 Mutual Funds  76   -   -   -   76
Equity Securities - Mutual Funds (b)  18   -   -   -   18
Total Other Temporary Investments  280   6   -   12   298
                 
Risk Management Assets              
Risk Management Commodity Contracts (c) (d)  38   776   142   (479)   477
Cash Flow Hedges:              
 Commodity Hedges (c)  4   28   -   (18)   14
Fair Value Hedges  -   1   -   3   4
De-designated Risk Management Contracts (e)  -   -   -   9   9
Total Risk Management Assets   42   805   142   (485)   504
                 
Spent Nuclear Fuel and Decommissioning Trusts              
Cash and Cash Equivalents (f)  3   -   -   11   14
Fixed Income Securities:              
 United States Government  -   605   -   -   605
 Corporate Debt  -   35   -   -   35
 State and Local Government  -   262   -   -   262
  Subtotal Fixed Income Securities  -   902   -   -   902
Equity Securities - Domestic (b)  875   -   -   -   875
Total Spent Nuclear Fuel and Decommissioning Trusts  878   902   -   11   1,791
                 
Total Assets$ 1,210 $ 1,714 $ 142 $ (356) $ 2,710
                 
Liabilities:              
                 
Risk Management Liabilities              
Risk Management Commodity Contracts (c) (d)$ 42 $ 697 $ 20 $ (497) $ 262
Cash Flow Hedges:              
 Commodity Hedges (c)  -   30   -   (18)   12
 Interest Rate/Foreign Currency Hedges  -   2   -   -   2
Fair Value Hedges  -   13   -   3   16
Total Risk Management Liabilities $ 42 $ 742 $ 20 $ (512) $ 292

Assets and Liabilities Measured at Fair Value on a Recurring Basis
December 31, 2012
            
   Level 1 Level 2 Level 3 Other Total
                 
Assets:(in millions)
                 
Cash and Cash Equivalents (a)$ 6 $ 1 $ - $ 272 $ 279
                 
Other Temporary Investments              
Restricted Cash (a)  227   5   -   9   241
Fixed Income Securities:              
 Mutual Funds  67   -   -   -   67
Equity Securities - Mutual Funds (b)  16   -   -   -   16
Total Other Temporary Investments  310   5   -   9   324
                 
Risk Management Assets              
Risk Management Commodity Contracts (c) (g)  47   938   131   (599)   517
Cash Flow Hedges:              
 Commodity Hedges (c)  8   28   -   (12)   24
Fair Value Hedges  -   2   -   2   4
De-designated Risk Management Contracts (e)  -   -   -   14   14
Total Risk Management Assets   55   968   131   (595)   559
                 
Spent Nuclear Fuel and Decommissioning Trusts              
Cash and Cash Equivalents (f)  7   -   -   10   17
Fixed Income Securities:              
 United States Government  -   648   -   -   648
 Corporate Debt  -   35   -   -   35
 State and Local Government  -   270   -   -   270
  Subtotal Fixed Income Securities  -   953   -   -   953
Equity Securities - Domestic (b)  736   -   -   -   736
Total Spent Nuclear Fuel and Decommissioning Trusts  743   953   -   10   1,706
                 
Total Assets$ 1,114 $ 1,927 $ 131 $ (304) $ 2,868
                 
Liabilities:              
                 
Risk Management Liabilities              
Risk Management Commodity Contracts (c) (g)$ 45 $ 838 $ 45 $ (636) $ 292
Cash Flow Hedges:              
 Commodity Hedges (c)  -   48   -   (12)   36
 Interest Rate/Foreign Currency Hedges  -   37   -   -   37
Fair Value Hedges  -   2   -   2   4
Total Risk Management Liabilities $ 45 $ 925 $ 45 $ (646) $ 369

(a)       Amounts in ''Other'' column primarily represent cash deposits in bank accounts with financial institutions or with third parties. Level 1 and Level 2 amounts primarily represent investments in money market funds.

(b)       Amounts represent publicly traded equity securities and equity-based mutual funds.

(c)       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.''

(d)       The June 30, 2013 maturity of the net fair value of risk management contracts prior to cash collateral, assets/(liabilities), is as follows: Level 1 matures $3 million in 2013, ($3) million in periods 2014-2016 and ($4) million in periods 2017-2018; Level 2 matures $12 million in 2013, $53 million in periods 2014-2016, $8 million in periods 2017-2018 and $6 million in periods 2019-2030; Level 3 matures $19 million in 2013, $50 million in periods 2014-2016, $30 million in periods 2017-2018 and $23 million in periods 2019-2030. Risk management commodity contracts are substantially comprised of power contracts.

(e)       Represents contracts that were originally MTM but were subsequently elected as normal under the accounting guidance for ''Derivatives and Hedging.'' At the time of the normal election, the MTM value was frozen and no longer fair valued. This MTM value will be amortized into revenues over the remaining life of the contracts.

(f)       Amounts in ''Other'' column primarily represent accrued interest receivables from financial institutions. Level 1 amounts primarily represent investments in money market funds.

(g)       The December 31, 2012 maturity of the net fair value of risk management contracts prior to cash collateral, assets/(liabilities), is as follows: Level 1 matures $9 million in 2013, ($3) million in periods 2014-2016 and ($4) million in periods 2017-2018; Level 2 matures $16 million in 2013, $61 million in periods 2014-2016, $16 million in periods 2017-2018 and $7 million in periods 2019-2030; Level 3 matures $18 million in 2013, $31 million in periods 2014-2016, $13 million in periods 2017-2018 and $24 million in periods 2019-2030. Risk management commodity contracts are substantially comprised of power contracts.
Changes in Fair Value of Net Trading Derivatives and Other Investments
    Net Risk Management
 Three Months Ended June 30, 2013 Assets (Liabilities)
    (in millions)
 Balance as of March 31, 2013 $ 76
 Realized Gain (Loss) Included in Net Income (or Changes in Net Assets) (a) (b)   (1)
 Unrealized Gain (Loss) Included in Net Income (or Changes in Net Assets)   
  Relating to Assets Still Held at the Reporting Date (a)   26
 Realized and Unrealized Gains (Losses) Included in Other Comprehensive Income   (1)
 Purchases, Issuances and Settlements (c)   (2)
 Transfers into Level 3 (d) (e)   12
 Transfers out of Level 3 (e) (f)   1
 Changes in Fair Value Allocated to Regulated Jurisdictions (g)   11
 Balance as of June 30, 2013 $ 122

    Net Risk Management
 Three Months Ended June 30, 2012 Assets (Liabilities)
    (in millions)
 Balance as of March 31, 2012 $ 92
 Realized Gain (Loss) Included in Net Income (or Changes in Net Assets) (a) (b)   (11)
 Unrealized Gain (Loss) Included in Net Income (or Changes in Net Assets)   
  Relating to Assets Still Held at the Reporting Date (a)   4
 Realized and Unrealized Gains (Losses) Included in Other Comprehensive Income   -
 Purchases, Issuances and Settlements (c)   15
 Transfers into Level 3 (d) (e)   (1)
 Transfers out of Level 3 (e) (f)   (8)
 Changes in Fair Value Allocated to Regulated Jurisdictions (g)   6
 Balance as of June 30, 2012 $ 97

    Net Risk Management
 Six Months Ended June 30, 2013 Assets (Liabilities)
    (in millions)
 Balance as of December 31, 2012 $ 86
 Realized Gain (Loss) Included in Net Income (or Changes in Net Assets) (a) (b)   (12)
 Unrealized Gain (Loss) Included in Net Income (or Changes in Net Assets)   
  Relating to Assets Still Held at the Reporting Date (a)   22
 Realized and Unrealized Gains (Losses) Included in Other Comprehensive Income   -
 Purchases, Issuances and Settlements (c)   (1)
 Transfers into Level 3 (d) (e)   18
 Transfers out of Level 3 (e) (f)   1
 Changes in Fair Value Allocated to Regulated Jurisdictions (g)   8
 Balance as of June 30, 2013 $ 122

    Net Risk Management
 Six Months Ended June 30, 2012 Assets (Liabilities)
    (in millions)
 Balance as of December 31, 2011 $ 69
 Realized Gain (Loss) Included in Net Income (or Changes in Net Assets) (a) (b)   (17)
 Unrealized Gain (Loss) Included in Net Income (or Changes in Net Assets)   
  Relating to Assets Still Held at the Reporting Date (a)   5
 Realized and Unrealized Gains (Losses) Included in Other Comprehensive Income   -
 Purchases, Issuances and Settlements (c)   33
 Transfers into Level 3 (d) (e)   14
 Transfers out of Level 3 (e) (f)   (20)
 Changes in Fair Value Allocated to Regulated Jurisdictions (g)   13
 Balance as of June 30, 2012 $ 97

(a)       Included in revenues on the condensed statements of income.

(b)       Represents the change in fair value between the beginning of the reporting period and the settlement of the risk management commodity contract.

(c)       Represents the settlement of risk management commodity contracts for the reporting period.

(d)       Represents existing assets or liabilities that were previously categorized as Level 2.

(e)       Transfers are recognized based on their value at the beginning of the reporting period that the transfer occurred.

(f)       Represents existing assets or liabilities that were previously categorized as Level 3.

(g)       Relates to the net gains (losses) of those contracts that are not reflected on the condensed statements of income. These net gains (losses) are recorded as regulatory liabilities/assets.
Significant Unobservable Inputs for Level 3
  Fair Value Valuation Significant Input/Range
 Assets LiabilitiesTechniqueUnobservable Input Low High
  (in millions)          
Energy Contracts $ 128 $ 16 Discounted Cash Flow Forward Market Price (a) $ 10.17 $ 140.98
          Counterparty Credit Risk (b)  356
FTRs   14   4 Discounted Cash Flow Forward Market Price (a)   (26.98)   11.19
Total $ 142 $ 20          

(a)       Represents market prices in dollars per MWh.

(b)       Represents average price of credit default swaps used to calculate counterparty credit risk, reported in basis points.
Appalachian Power Co [Member]
  
Book Values and Fair Values of Long-term Debt
   June 30, 2013 December 31, 2012
 Company Book Value Fair Value Book Value Fair Value
   (in thousands)
 APCo $ 3,702,759 $ 4,241,900 $ 3,702,442 $ 4,555,143
 I&M   2,305,192   2,490,561   2,057,666   2,372,017
 OPCo   3,504,794   4,002,270   3,860,440   4,560,337
 PSO   949,841   1,107,094   949,871   1,175,759
 SWEPCo   2,044,780   2,231,426   2,046,228   2,400,509
Fair Value, Assets and Liabilities Measured on Recurring Basis
APCo              
Assets and Liabilities Measured at Fair Value on a Recurring Basis
June 30, 2013
           
  Level 1 Level 2 Level 3 Other Total
                
Assets:(in thousands)
                
Risk Management Assets              
Risk Management Commodity Contracts (a) (b)$ 2,555 $ 107,096 $ 15,526 $ (73,619) $ 51,558
Cash Flow Hedges:              
 Commodity Hedges (a)  -   995   -   (425)   570
Total Risk Management Assets $ 2,555 $ 108,091 $ 15,526 $ (74,044) $ 52,128
                
Liabilities:              
                
Risk Management Liabilities              
Risk Management Commodity Contracts (a) (b)$ 1,477 $ 101,183 $ 2,550 $ (78,084) $ 27,126
Cash Flow Hedges:              
 Commodity Hedges (a)  -   703   -   (425)   278
Total Risk Management Liabilities $ 1,477 $ 101,886 $ 2,550 $ (78,509) $ 27,404

APCo              
Assets and Liabilities Measured at Fair Value on a Recurring Basis
December 31, 2012
           
  Level 1 Level 2 Level 3 Other Total
                
Assets:(in thousands)
                
Risk Management Assets              
Risk Management Commodity Contracts (a) (b)$ 4,161 $ 166,916 $ 17,058 $ (123,117) $ 65,018
Cash Flow Hedges:              
 Commodity Hedges (a)  -   498   -   (196)   302
Total Risk Management Assets $ 4,161 $ 167,414 $ 17,058 $ (123,313) $ 65,320
                
Liabilities:              
                
Risk Management Liabilities              
Risk Management Commodity Contracts (a) (b)$ 1,959 $ 158,665 $ 6,079 $ (132,884) $ 33,819
Cash Flow Hedges:              
 Commodity Hedges (a)  -   1,551   -   (196)   1,355
Total Risk Management Liabilities $ 1,959 $ 160,216 $ 6,079 $ (133,080) $ 35,174

(a)       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.”

(b)       Substantially comprised of power contracts for APCo, I&M and OPCo and coal contracts for PSO and SWEPCo.

(c)       Amounts in “Other” column primarily represent accrued interest receivables from financial institutions. Level 1 amounts primarily represent investments in money market funds.

(d)       Amounts represent publicly traded equity securities and equity-based mutual funds.

(e)       Amounts in “Other” column primarily represent cash deposits with third parties. Level 1 and Level 2 amounts primarily represent investments in money market funds.
Changes in Fair Value of Net Trading Derivatives and Other Investments
 Three Months Ended June 30, 2013 APCo I&M OPCo
   (in thousands)
 Balance as of March 31, 2013 $ 8,756 $ 6,051 $ 12,381
 Realized Gain (Loss) Included in Net Income         
  (or Changes in Net Assets) (a) (b)   (369)   (255)   (522)
 Unrealized Gain (Loss) Included in Net         
  Income (or Changes in Net Assets) Relating         
  to Assets Still Held at the Reporting Date (a)   -   -   2,390
 Realized and Unrealized Gains (Losses)         
  Included in Other Comprehensive Income   -   -   -
 Purchases, Issuances and Settlements (c)   641   443   906
 Transfers into Level 3 (d) (e)   243   168   344
 Transfers out of Level 3 (e) (f)   (362)   (250)   (512)
 Changes in Fair Value Allocated to Regulated         
  Jurisdictions (g)   4,067   2,810   3,360
 Balance as of June 30, 2013 $ 12,976 $ 8,967 $ 18,347

 Three Months Ended June 30, 2012 APCo I&M OPCo
   (in thousands)
 Balance as of March 31, 2012 $ 7,981 $ 5,614 $ 11,767
 Realized Gain (Loss) Included in Net Income         
  (or Changes in Net Assets) (a) (b)   (3,210)   (2,258)   (4,734)
 Unrealized Gain (Loss) Included in Net         
  Income (or Changes in Net Assets) Relating         
  to Assets Still Held at the Reporting Date (a)   -   -   1,711
 Realized and Unrealized Gains (Losses)         
  Included in Other Comprehensive Income   (11)   (8)   (16)
 Purchases, Issuances and Settlements (c)   4,988   3,508   7,355
 Transfers into Level 3 (d) (e)   1,301   915   1,919
 Transfers out of Level 3 (e) (f)   (557)   (392)   (821)
 Changes in Fair Value Allocated to Regulated         
  Jurisdictions (g)   2,372   1,670   1,788
 Balance as of June 30, 2012 $ 12,864 $ 9,049 $ 18,969

 Six Months Ended June 30, 2013 APCo I&M OPCo
   (in thousands)
 Balance as of December 31, 2012 $ 10,979 $ 7,541 $ 15,429
 Realized Gain (Loss) Included in Net Income         
  (or Changes in Net Assets) (a) (b)   (3,532)   (2,439)   (4,990)
 Unrealized Gain (Loss) Included in Net         
  Income (or Changes in Net Assets) Relating         
  to Assets Still Held at the Reporting Date (a)   -   -   598
 Realized and Unrealized Gains (Losses)         
  Included in Other Comprehensive Income   -   -   -
 Purchases, Issuances and Settlements (c)   2,859   1,977   4,045
 Transfers into Level 3 (d) (e)   875   602   1,231
 Transfers out of Level 3 (e) (f)   (941)   (648)   (1,326)
 Changes in Fair Value Allocated to Regulated         
  Jurisdictions (g)   2,736   1,934   3,360
 Balance as of June 30, 2013 $ 12,976 $ 8,967 $ 18,347

 Six Months Ended June 30, 2012 APCo I&M OPCo
   (in thousands)
 Balance as of December 31, 2011 $ 1,971 $ 1,263 $ 2,666
 Realized Gain (Loss) Included in Net Income         
  (or Changes in Net Assets) (a) (b)   (5,313)   (3,590)   (7,533)
 Unrealized Gain (Loss) Included in Net         
  Income (or Changes in Net Assets) Relating         
  to Assets Still Held at the Reporting Date (a)   -   -   7,035
 Realized and Unrealized Gains (Losses)         
  Included in Other Comprehensive Income   52   34   71
 Purchases, Issuances and Settlements (c)   11,499   7,811   16,397
 Transfers into Level 3 (d) (e)   3,562   2,341   4,934
 Transfers out of Level 3 (e) (f)   (4,676)   (3,028)   (6,388)
 Changes in Fair Value Allocated to Regulated         
  Jurisdictions (g)   5,769   4,218   1,787
 Balance as of June 30, 2012 $ 12,864 $ 9,049 $ 18,969

(a)       Included in revenues on the condensed statements of income.

(b)       Represents the change in fair value between the beginning of the reporting period and the settlement of the risk management commodity contract.

(c)       Represents the settlement of risk management commodity contracts for the reporting period.

(d)       Represents existing assets or liabilities that were previously categorized as Level 2.

(e)       Transfers are recognized based on their value at the beginning of the reporting period that the transfer occurred.

(f)       Represents existing assets or liabilities that were previously categorized as Level 3.

(g)       Relates to the net gains (losses) of those contracts that are not reflected on the condensed statements of income. These net gains (losses) are recorded as regulatory liabilities/assets.
Significant Unobservable Inputs for Level 3
 APCo                
   Fair Value Valuation Significant Forward Price Range
  Assets LiabilitiesTechniqueUnobservable Input (a) Low High
   (in thousands)          
 Energy Contracts $ 11,823 $ 1,613 Discounted Cash Flow Forward Market Price $ 11.48 $ 70.90
 FTRs   3,703   937 Discounted Cash Flow Forward Market Price   (12.31)   11.19
 Total $ 15,526 $ 2,550          

(a)       Represents market prices in dollars per MWh.
Indiana Michigan Power Co [Member]
  
Book Values and Fair Values of Long-term Debt
   June 30, 2013 December 31, 2012
 Company Book Value Fair Value Book Value Fair Value
   (in thousands)
 APCo $ 3,702,759 $ 4,241,900 $ 3,702,442 $ 4,555,143
 I&M   2,305,192   2,490,561   2,057,666   2,372,017
 OPCo   3,504,794   4,002,270   3,860,440   4,560,337
 PSO   949,841   1,107,094   949,871   1,175,759
 SWEPCo   2,044,780   2,231,426   2,046,228   2,400,509
Nuclear Trust Fund Investments
    June 30, 2013 December 31, 2012
    Estimated Gross Other-Than-  Estimated Gross Other-Than-
   FairUnrealizedTemporaryFairUnrealizedTemporary
   ValueGains (Losses)ImpairmentsValueGainsImpairments
    (in thousands)
 Cash and Cash Equivalents $ 14,132 $ - $ - $ 16,783 $ - $ -
 Fixed Income Securities:                  
  United States Government   604,850   37,609   (2,085)   647,918   58,268   (747)
  Corporate Debt   35,202   2,963   (1,592)   35,399   4,903   (1,352)
  State and Local Government   262,521   (1,661)   (2,832)   270,090   1,006   (863)
   Subtotal Fixed Income Securities  902,573   38,911   (6,509)   953,407   64,177   (2,962)
 Equity Securities - Domestic   874,689   372,591   (82,148)   735,582   284,599   (76,557)
 Spent Nuclear Fuel and                  
  Decommissioning Trusts $ 1,791,394 $ 411,502 $ (88,657) $ 1,705,772 $ 348,776 $ (79,519)
Securities Activity Within the Decommissioning and SNF Trusts
  Three Months Ended June 30, Six Months Ended June 30,
  2013 2012 2013 2012
  (in thousands)
 Proceeds from Investment Sales$ 218,272 $ 182,179 $ 385,942 $ 516,579
 Purchases of Investments  227,470   192,104   411,769   544,981
 Gross Realized Gains on Investment Sales  8,575   3,380   11,898   4,932
 Gross Realized Losses on Investment Sales  7,397   803   9,712   2,219
Contractual Maturities, Fair Value of Debt Securities in Nuclear Trusts
  Fair Value of 
  Fixed Income 
  Securities 
     
  (in thousands) 
 Within 1 year$ 78,832 
 1 year – 5 years  340,397 
 5 years – 10 years  238,064 
 After 10 years  245,280 
 Total$ 902,573 
Fair Value, Assets and Liabilities Measured on Recurring Basis
I&M              
Assets and Liabilities Measured at Fair Value on a Recurring Basis
June 30, 2013
            
   Level 1 Level 2 Level 3 Other Total
                 
Assets:(in thousands)
                 
Risk Management Assets              
Risk Management Commodity Contracts (a) (b)$ 1,766 $ 73,702 $ 10,729 $ (50,676) $ 35,521
Cash Flow Hedges:              
 Commodity Hedges (a)  -   686   -   (293)   393
Total Risk Management Assets   1,766   74,388   10,729   (50,969)   35,914
                 
Spent Nuclear Fuel and Decommissioning Trusts              
Cash and Cash Equivalents (c)  2,939   -   -   11,193   14,132
Fixed Income Securities:              
 United States Government  -   604,850   -   -   604,850
 Corporate Debt  -   35,202   -   -   35,202
 State and Local Government  -   262,521   -   -   262,521
  Subtotal Fixed Income Securities  -   902,573   -   -   902,573
Equity Securities - Domestic (d)  874,689   -   -   -   874,689
Total Spent Nuclear Fuel and Decommissioning Trusts  877,628   902,573   -   11,193   1,791,394
                 
Total Assets$ 879,394 $ 976,961 $ 10,729 $ (39,776) $ 1,827,308
                 
Liabilities:              
                 
Risk Management Liabilities              
Risk Management Commodity Contracts (a) (b)$ 1,021 $ 70,200 $ 1,762 $ (53,750) $ 19,233
Cash Flow Hedges:              
 Commodity Hedges (a)  -   467   -   (293)   174
Total Risk Management Liabilities $ 1,021 $ 70,667 $ 1,762 $ (54,043) $ 19,407

I&M              
  Assets and Liabilities Measured at Fair Value on a Recurring Basis
  December 31, 2012
            
   Level 1 Level 2 Level 3 Other Total
                 
Assets:(in thousands)
                 
Risk Management Assets              
Risk Management Commodity Contracts (a) (b)$ 2,858 $ 120,242 $ 11,717 $ (84,474) $ 50,343
Cash Flow Hedges:              
 Commodity Hedges (a)  -   330   -   (130)   200
Total Risk Management Assets   2,858   120,572   11,717   (84,604)   50,543
                 
Spent Nuclear Fuel and Decommissioning Trusts              
Cash and Cash Equivalents (c)  6,508   -   -   10,275   16,783
Fixed Income Securities:              
 United States Government  -   647,918   -   -   647,918
 Corporate Debt  -   35,399   -   -   35,399
 State and Local Government  -   270,090   -   -   270,090
  Subtotal Fixed Income Securities  -   953,407   -   -   953,407
Equity Securities - Domestic (d)  735,582   -   -   -   735,582
Total Spent Nuclear Fuel and Decommissioning Trusts  742,090   953,407   -   10,275   1,705,772
                 
Total Assets$ 744,948 $ 1,073,979 $ 11,717 $ (74,329) $ 1,756,315
                 
Liabilities:              
                 
Risk Management Liabilities              
Risk Management Commodity Contracts (a) (b)$ 1,346 $ 110,621 $ 4,176 $ (91,183) $ 24,960
Cash Flow Hedges:              
 Commodity Hedges (a)  -   1,061   -   (130)   931
 Interest Rate/Foreign Currency Hedges  -   19,524   -   -   19,524
Total Risk Management Liabilities $ 1,346 $ 131,206 $ 4,176 $ (91,313) $ 45,415

(a)       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.”

(b)       Substantially comprised of power contracts for APCo, I&M and OPCo and coal contracts for PSO and SWEPCo.

(c)       Amounts in “Other” column primarily represent accrued interest receivables from financial institutions. Level 1 amounts primarily represent investments in money market funds.

(d)       Amounts represent publicly traded equity securities and equity-based mutual funds.

(e)       Amounts in “Other” column primarily represent cash deposits with third parties. Level 1 and Level 2 amounts primarily represent investments in money market funds.
Changes in Fair Value of Net Trading Derivatives and Other Investments
 Three Months Ended June 30, 2013 APCo I&M OPCo
   (in thousands)
 Balance as of March 31, 2013 $ 8,756 $ 6,051 $ 12,381
 Realized Gain (Loss) Included in Net Income         
  (or Changes in Net Assets) (a) (b)   (369)   (255)   (522)
 Unrealized Gain (Loss) Included in Net         
  Income (or Changes in Net Assets) Relating         
  to Assets Still Held at the Reporting Date (a)   -   -   2,390
 Realized and Unrealized Gains (Losses)         
  Included in Other Comprehensive Income   -   -   -
 Purchases, Issuances and Settlements (c)   641   443   906
 Transfers into Level 3 (d) (e)   243   168   344
 Transfers out of Level 3 (e) (f)   (362)   (250)   (512)
 Changes in Fair Value Allocated to Regulated         
  Jurisdictions (g)   4,067   2,810   3,360
 Balance as of June 30, 2013 $ 12,976 $ 8,967 $ 18,347

 Three Months Ended June 30, 2012 APCo I&M OPCo
   (in thousands)
 Balance as of March 31, 2012 $ 7,981 $ 5,614 $ 11,767
 Realized Gain (Loss) Included in Net Income         
  (or Changes in Net Assets) (a) (b)   (3,210)   (2,258)   (4,734)
 Unrealized Gain (Loss) Included in Net         
  Income (or Changes in Net Assets) Relating         
  to Assets Still Held at the Reporting Date (a)   -   -   1,711
 Realized and Unrealized Gains (Losses)         
  Included in Other Comprehensive Income   (11)   (8)   (16)
 Purchases, Issuances and Settlements (c)   4,988   3,508   7,355
 Transfers into Level 3 (d) (e)   1,301   915   1,919
 Transfers out of Level 3 (e) (f)   (557)   (392)   (821)
 Changes in Fair Value Allocated to Regulated         
  Jurisdictions (g)   2,372   1,670   1,788
 Balance as of June 30, 2012 $ 12,864 $ 9,049 $ 18,969

 Six Months Ended June 30, 2013 APCo I&M OPCo
   (in thousands)
 Balance as of December 31, 2012 $ 10,979 $ 7,541 $ 15,429
 Realized Gain (Loss) Included in Net Income         
  (or Changes in Net Assets) (a) (b)   (3,532)   (2,439)   (4,990)
 Unrealized Gain (Loss) Included in Net         
  Income (or Changes in Net Assets) Relating         
  to Assets Still Held at the Reporting Date (a)   -   -   598
 Realized and Unrealized Gains (Losses)         
  Included in Other Comprehensive Income   -   -   -
 Purchases, Issuances and Settlements (c)   2,859   1,977   4,045
 Transfers into Level 3 (d) (e)   875   602   1,231
 Transfers out of Level 3 (e) (f)   (941)   (648)   (1,326)
 Changes in Fair Value Allocated to Regulated         
  Jurisdictions (g)   2,736   1,934   3,360
 Balance as of June 30, 2013 $ 12,976 $ 8,967 $ 18,347

 Six Months Ended June 30, 2012 APCo I&M OPCo
   (in thousands)
 Balance as of December 31, 2011 $ 1,971 $ 1,263 $ 2,666
 Realized Gain (Loss) Included in Net Income         
  (or Changes in Net Assets) (a) (b)   (5,313)   (3,590)   (7,533)
 Unrealized Gain (Loss) Included in Net         
  Income (or Changes in Net Assets) Relating         
  to Assets Still Held at the Reporting Date (a)   -   -   7,035
 Realized and Unrealized Gains (Losses)         
  Included in Other Comprehensive Income   52   34   71
 Purchases, Issuances and Settlements (c)   11,499   7,811   16,397
 Transfers into Level 3 (d) (e)   3,562   2,341   4,934
 Transfers out of Level 3 (e) (f)   (4,676)   (3,028)   (6,388)
 Changes in Fair Value Allocated to Regulated         
  Jurisdictions (g)   5,769   4,218   1,787
 Balance as of June 30, 2012 $ 12,864 $ 9,049 $ 18,969

(a)       Included in revenues on the condensed statements of income.

(b)       Represents the change in fair value between the beginning of the reporting period and the settlement of the risk management commodity contract.

(c)       Represents the settlement of risk management commodity contracts for the reporting period.

(d)       Represents existing assets or liabilities that were previously categorized as Level 2.

(e)       Transfers are recognized based on their value at the beginning of the reporting period that the transfer occurred.

(f)       Represents existing assets or liabilities that were previously categorized as Level 3.

(g)       Relates to the net gains (losses) of those contracts that are not reflected on the condensed statements of income. These net gains (losses) are recorded as regulatory liabilities/assets.
Significant Unobservable Inputs for Level 3
 I&M                
   Fair Value Valuation Significant Forward Price Range
  Assets LiabilitiesTechniqueUnobservable Input (a) Low High
   (in thousands)          
 Energy Contracts $ 8,170 $ 1,115 Discounted Cash Flow Forward Market Price $ 11.48 $ 70.90
 FTRs   2,559   647 Discounted Cash Flow Forward Market Price   (12.31)   11.19
 Total $ 10,729 $ 1,762          

(a)       Represents market prices in dollars per MWh.
Ohio Power Co [Member]
  
Book Values and Fair Values of Long-term Debt
   June 30, 2013 December 31, 2012
 Company Book Value Fair Value Book Value Fair Value
   (in thousands)
 APCo $ 3,702,759 $ 4,241,900 $ 3,702,442 $ 4,555,143
 I&M   2,305,192   2,490,561   2,057,666   2,372,017
 OPCo   3,504,794   4,002,270   3,860,440   4,560,337
 PSO   949,841   1,107,094   949,871   1,175,759
 SWEPCo   2,044,780   2,231,426   2,046,228   2,400,509
Fair Value, Assets and Liabilities Measured on Recurring Basis
OPCo              
 Assets and Liabilities Measured at Fair Value on a Recurring Basis
 June 30, 2013
                
  Level 1 Level 2 Level 3 Other Total
                
Assets:(in thousands)
                
Other Cash Deposits (e)$ - $ 26 $ - $ 39 $ 65
                
Risk Management Assets              
Risk Management Commodity Contracts (a) (b)  3,613   155,550   21,953   (107,395)   73,721
Cash Flow Hedges:              
 Commodity Hedges (a)  -   1,405   -   (600)   805
Total Risk Management Assets   3,613   156,955   21,953   (107,995)   74,526
                
Total Assets$ 3,613 $ 156,981 $ 21,953 $ (107,956) $ 74,591
                
Liabilities:              
                
Risk Management Liabilities              
Risk Management Commodity Contracts (a) (b)$ 2,088 $ 147,199 $ 3,606 $ (113,692) $ 39,201
Cash Flow Hedges:              
 Commodity Hedges (a)  -   971   -   (600)   371
Total Risk Management Liabilities $ 2,088 $ 148,170 $ 3,606 $ (114,292) $ 39,572

OPCo              
 Assets and Liabilities Measured at Fair Value on a Recurring Basis
 December 31, 2012
           
  Level 1 Level 2 Level 3 Other Total
                
Assets:(in thousands)
                
Other Cash Deposits (e)$ - $ 26 $ - $ 39 $ 65
                
Risk Management Assets              
Risk Management Commodity Contracts (a) (b)  5,848   238,254   23,973   (175,890)   92,185
Cash Flow Hedges:              
 Commodity Hedges (a)  -   688   -   (272)   416
Total Risk Management Assets   5,848   238,942   23,973   (176,162)   92,601
                
Total Assets$ 5,848 $ 238,968 $ 23,973 $ (176,123) $ 92,666
                
Liabilities:              
                
Risk Management Liabilities              
Risk Management Commodity Contracts (a) (b)$ 2,753 $ 226,536 $ 8,544 $ (189,616) $ 48,217
Cash Flow Hedges:              
 Commodity Hedges (a)  -   2,175   -   (272)   1,903
Total Risk Management Liabilities $ 2,753 $ 228,711 $ 8,544 $ (189,888) $ 50,120

(a)       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.”

(b)       Substantially comprised of power contracts for APCo, I&M and OPCo and coal contracts for PSO and SWEPCo.

(c)       Amounts in “Other” column primarily represent accrued interest receivables from financial institutions. Level 1 amounts primarily represent investments in money market funds.

(d)       Amounts represent publicly traded equity securities and equity-based mutual funds.

(e)       Amounts in “Other” column primarily represent cash deposits with third parties. Level 1 and Level 2 amounts primarily represent investments in money market funds.
Changes in Fair Value of Net Trading Derivatives and Other Investments
 Three Months Ended June 30, 2013 APCo I&M OPCo
   (in thousands)
 Balance as of March 31, 2013 $ 8,756 $ 6,051 $ 12,381
 Realized Gain (Loss) Included in Net Income         
  (or Changes in Net Assets) (a) (b)   (369)   (255)   (522)
 Unrealized Gain (Loss) Included in Net         
  Income (or Changes in Net Assets) Relating         
  to Assets Still Held at the Reporting Date (a)   -   -   2,390
 Realized and Unrealized Gains (Losses)         
  Included in Other Comprehensive Income   -   -   -
 Purchases, Issuances and Settlements (c)   641   443   906
 Transfers into Level 3 (d) (e)   243   168   344
 Transfers out of Level 3 (e) (f)   (362)   (250)   (512)
 Changes in Fair Value Allocated to Regulated         
  Jurisdictions (g)   4,067   2,810   3,360
 Balance as of June 30, 2013 $ 12,976 $ 8,967 $ 18,347

 Three Months Ended June 30, 2012 APCo I&M OPCo
   (in thousands)
 Balance as of March 31, 2012 $ 7,981 $ 5,614 $ 11,767
 Realized Gain (Loss) Included in Net Income         
  (or Changes in Net Assets) (a) (b)   (3,210)   (2,258)   (4,734)
 Unrealized Gain (Loss) Included in Net         
  Income (or Changes in Net Assets) Relating         
  to Assets Still Held at the Reporting Date (a)   -   -   1,711
 Realized and Unrealized Gains (Losses)         
  Included in Other Comprehensive Income   (11)   (8)   (16)
 Purchases, Issuances and Settlements (c)   4,988   3,508   7,355
 Transfers into Level 3 (d) (e)   1,301   915   1,919
 Transfers out of Level 3 (e) (f)   (557)   (392)   (821)
 Changes in Fair Value Allocated to Regulated         
  Jurisdictions (g)   2,372   1,670   1,788
 Balance as of June 30, 2012 $ 12,864 $ 9,049 $ 18,969

 Six Months Ended June 30, 2013 APCo I&M OPCo
   (in thousands)
 Balance as of December 31, 2012 $ 10,979 $ 7,541 $ 15,429
 Realized Gain (Loss) Included in Net Income         
  (or Changes in Net Assets) (a) (b)   (3,532)   (2,439)   (4,990)
 Unrealized Gain (Loss) Included in Net         
  Income (or Changes in Net Assets) Relating         
  to Assets Still Held at the Reporting Date (a)   -   -   598
 Realized and Unrealized Gains (Losses)         
  Included in Other Comprehensive Income   -   -   -
 Purchases, Issuances and Settlements (c)   2,859   1,977   4,045
 Transfers into Level 3 (d) (e)   875   602   1,231
 Transfers out of Level 3 (e) (f)   (941)   (648)   (1,326)
 Changes in Fair Value Allocated to Regulated         
  Jurisdictions (g)   2,736   1,934   3,360
 Balance as of June 30, 2013 $ 12,976 $ 8,967 $ 18,347

 Six Months Ended June 30, 2012 APCo I&M OPCo
   (in thousands)
 Balance as of December 31, 2011 $ 1,971 $ 1,263 $ 2,666
 Realized Gain (Loss) Included in Net Income         
  (or Changes in Net Assets) (a) (b)   (5,313)   (3,590)   (7,533)
 Unrealized Gain (Loss) Included in Net         
  Income (or Changes in Net Assets) Relating         
  to Assets Still Held at the Reporting Date (a)   -   -   7,035
 Realized and Unrealized Gains (Losses)         
  Included in Other Comprehensive Income   52   34   71
 Purchases, Issuances and Settlements (c)   11,499   7,811   16,397
 Transfers into Level 3 (d) (e)   3,562   2,341   4,934
 Transfers out of Level 3 (e) (f)   (4,676)   (3,028)   (6,388)
 Changes in Fair Value Allocated to Regulated         
  Jurisdictions (g)   5,769   4,218   1,787
 Balance as of June 30, 2012 $ 12,864 $ 9,049 $ 18,969

(a)       Included in revenues on the condensed statements of income.

(b)       Represents the change in fair value between the beginning of the reporting period and the settlement of the risk management commodity contract.

(c)       Represents the settlement of risk management commodity contracts for the reporting period.

(d)       Represents existing assets or liabilities that were previously categorized as Level 2.

(e)       Transfers are recognized based on their value at the beginning of the reporting period that the transfer occurred.

(f)       Represents existing assets or liabilities that were previously categorized as Level 3.

(g)       Relates to the net gains (losses) of those contracts that are not reflected on the condensed statements of income. These net gains (losses) are recorded as regulatory liabilities/assets.
Significant Unobservable Inputs for Level 3
 OPCo                
   Fair Value Valuation Significant Forward Price Range
  Assets LiabilitiesTechniqueUnobservable Input (a) Low High
   (in thousands)          
 Energy Contracts $ 16,717 $ 2,282 Discounted Cash Flow Forward Market Price $ 11.48 $ 70.90
 FTRs   5,236   1,324 Discounted Cash Flow Forward Market Price   (12.31)   11.19
 Total $ 21,953 $ 3,606          

(a)       Represents market prices in dollars per MWh.
Public Service Co Of Oklahoma [Member]
  
Book Values and Fair Values of Long-term Debt
   June 30, 2013 December 31, 2012
 Company Book Value Fair Value Book Value Fair Value
   (in thousands)
 APCo $ 3,702,759 $ 4,241,900 $ 3,702,442 $ 4,555,143
 I&M   2,305,192   2,490,561   2,057,666   2,372,017
 OPCo   3,504,794   4,002,270   3,860,440   4,560,337
 PSO   949,841   1,107,094   949,871   1,175,759
 SWEPCo   2,044,780   2,231,426   2,046,228   2,400,509
Fair Value, Assets and Liabilities Measured on Recurring Basis
PSO              
 Assets and Liabilities Measured at Fair Value on a Recurring Basis
 June 30, 2013
           
  Level 1 Level 2 Level 3 Other Total
                
Assets:(in thousands)
                
Risk Management Assets              
Risk Management Commodity Contracts (a) (b)$ - $ 1,289 $ - $ (807) $ 482
Cash Flow Hedges:              
 Commodity Hedges (a)  -   6   -   (4)   2
Total Risk Management Assets $ - $ 1,295 $ - $ (811) $ 484
                
Liabilities:              
                
Risk Management Liabilities              
Risk Management Commodity Contracts (a) (b)$ - $ 2,910 $ - $ (842) $ 2,068
Cash Flow Hedges:              
 Commodity Hedges (a)  -   49   -   (4)   45
Total Risk Management Liabilities $ - $ 2,959 $ - $ (846) $ 2,113

PSO              
 Assets and Liabilities Measured at Fair Value on a Recurring Basis
 December 31, 2012
           
  Level 1 Level 2 Level 3 Other Total
                
Assets:(in thousands)
                
Risk Management Assets              
Risk Management Commodity Contracts (a) (b)$ - $ 1,657 $ - $ (1,142) $ 515
Cash Flow Hedges:              
 Commodity Hedges (a)  -   42   -   (17)   25
Total Risk Management Assets$ - $ 1,699 $ - $ (1,159) $ 540
                
Liabilities:              
                
Risk Management Liabilities              
Risk Management Commodity Contracts (a) (b)$ - $ 7,021 $ - $ (1,142) $ 5,879
Cash Flow Hedges:              
 Commodity Hedges (a)  -   17   -   (17)   -
Total Risk Management Liabilities$ - $ 7,038 $ - $ (1,159) $ 5,879

(a)       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.”

(b)       Substantially comprised of power contracts for APCo, I&M and OPCo and coal contracts for PSO and SWEPCo.

(c)       Amounts in “Other” column primarily represent accrued interest receivables from financial institutions. Level 1 amounts primarily represent investments in money market funds.

(d)       Amounts represent publicly traded equity securities and equity-based mutual funds.

(e)       Amounts in “Other” column primarily represent cash deposits with third parties. Level 1 and Level 2 amounts primarily represent investments in money market funds.
Southwestern Electric Power Co [Member]
  
Book Values and Fair Values of Long-term Debt
   June 30, 2013 December 31, 2012
 Company Book Value Fair Value Book Value Fair Value
   (in thousands)
 APCo $ 3,702,759 $ 4,241,900 $ 3,702,442 $ 4,555,143
 I&M   2,305,192   2,490,561   2,057,666   2,372,017
 OPCo   3,504,794   4,002,270   3,860,440   4,560,337
 PSO   949,841   1,107,094   949,871   1,175,759
 SWEPCo   2,044,780   2,231,426   2,046,228   2,400,509
Fair Value, Assets and Liabilities Measured on Recurring Basis
SWEPCo              
Assets and Liabilities Measured at Fair Value on a Recurring Basis
June 30, 2013
          
  Level 1 Level 2 Level 3 Other Total
                
Assets:(in thousands)
                
Cash and Cash Equivalents (e)$ 10,078 $ - $ - $ 1,762 $ 11,840
                
Risk Management Assets              
Risk Management Commodity Contracts (a) (b)  -   1,846   -   (1,450)   396
Cash Flow Hedges:              
 Commodity Hedges (a)  -   7   -   (5)   2
Total Risk Management Assets   -   1,853   -   (1,455)   398
                
Total Assets $ 10,078 $ 1,853 $ - $ 307 $ 12,238
                
Liabilities:              
                
Risk Management Liabilities              
Risk Management Commodity Contracts (a) (b)$ - $ 2,382 $ - $ (1,494) $ 888
Cash Flow Hedges:              
 Commodity Hedges (a)  -   61   -   (5)   56
Total Risk Management Liabilities $ - $ 2,443 $ - $ (1,499) $ 944

SWEPCo              
 Assets and Liabilities Measured at Fair Value on a Recurring Basis
 December 31, 2012
           
  Level 1 Level 2 Level 3 Other Total
                
Assets:(in thousands)
                
Risk Management Assets              
Risk Management Commodity Contracts (a) (b)$ - $ 2,804 $ - $ (2,133) $ 671
Cash Flow Hedges:              
 Commodity Hedges (a)  -   41   -   (17)   24
Total Risk Management Assets $ - $ 2,845 $ - $ (2,150) $ 695
                
Liabilities:              
                
Risk Management Liabilities              
Risk Management Commodity Contracts (a) (b)$ - $ 3,261 $ - $ (2,133) $ 1,128
Cash Flow Hedges:              
 Commodity Hedges (a)  -   17   -   (17)   -
Total Risk Management Liabilities$ - $ 3,278 $ - $ (2,150) $ 1,128

(a)       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.”

(b)       Substantially comprised of power contracts for APCo, I&M and OPCo and coal contracts for PSO and SWEPCo.

(c)       Amounts in “Other” column primarily represent accrued interest receivables from financial institutions. Level 1 amounts primarily represent investments in money market funds.

(d)       Amounts represent publicly traded equity securities and equity-based mutual funds.

(e)       Amounts in “Other” column primarily represent cash deposits with third parties. Level 1 and Level 2 amounts primarily represent investments in money market funds.