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Financing Activities (Details) - USD ($)
$ in Thousands
1 Months Ended 3 Months Ended 6 Months Ended
Jul. 23, 2015
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Dec. 31, 2014
Long-term Debt            
Senior Unsecured Notes   $ 13,628,000   $ 13,628,000   $ 12,647,000
Pollution Control Bonds   1,963,000   1,963,000   1,963,000
Notes Payable   409,000   409,000   357,000
Securitization Bonds   2,200,000   2,200,000   2,380,000
Spent Nuclear Fuel Obligation [1]   266,000   266,000   266,000
Other Long-term Debt   1,144,000   1,144,000   1,101,000
Fair Value of Interest Rate Hedges   (3,000)   (3,000)   (6,000)
Unamortized Discount, Net   (29,000)   (29,000)   (24,000)
Total Long-term Debt Outstanding   19,578,000   19,578,000   18,684,000
Long-term Debt Due Within One Year   1,817,000   1,817,000   2,503,000
Long-term Debt   17,761,000   17,761,000   16,181,000
Long-term Debt and Other Securities Issued, Retired and Principal Payments Made            
Issuances [2]       2,624,000    
Retirements and Principal Payments       1,727,000 $ 1,205,000  
Short-term Debt:            
Securitized Debt for Receivables [3]   708,000   708,000   744,000
Commercial Paper   397,000   397,000   602,000
Total Short-term Debt   $ 1,105,000   $ 1,105,000   $ 1,346,000
Securitized Debt for Receivables [4]   0.27%   0.27%   0.22%
Comparative Accounts Receivable Information            
Effective Interest Rates on Securitization of Accounts Receivable   0.27% 0.22% 0.27% 0.23%  
Net Uncollectible Accounts Receivable Written Off   $ 6,000 $ 7,000 $ 13,000 $ 14,000  
Customer Accounts Receivable Managed Portfolio            
Accounts Receivable Retained Interest and Pledged as Collateral Less Uncollectible Accounts   977,000   977,000   $ 975,000
Total Principal Outstanding   708,000   708,000   744,000
Delinquent Securitized Accounts Receivable   50,000   50,000   44,000
Bad Debt Reserves Related to Securitization, Sale of Accounts Receivable   19,000   19,000   13,000
Unbilled Receivables Related to Securitization, Sale of Accounts Receivable   363,000   363,000   335,000
Financing Activities (Textuals) [Abstract]            
Reacquired Pollution Controls Bonds Held by Trustees   385,000   $ 385,000    
Maximum Percentage Debt to Capitalization       67.50%    
Total Commitment from Bank Conduits to Finance Receivables   750,000 700,000 $ 750,000 700,000  
Trust Fund Assets One Time Fee Obligation for Nuclear Fuel Disposition   $ 309,000   $ 309,000   $ 309,000
Commercial Paper [Member]            
Short-term Debt:            
Commercial Paper [4]   0.47%   0.47%   0.59%
AEP Subsidiaries [Member]            
Long-term Debt            
Long-term Debt Due Within One Year   $ 463,000   $ 463,000   $ 431,000
Long-term Debt   $ 2,114,000   2,114,000   2,260,000
AEP Subsidiaries [Member] | Notes Payable One [Member]            
Long-term Debt and Other Securities Issued, Retired and Principal Payments Made            
Retirements and Principal Payments       $ 1,000    
Interest Rate (Variable)       Variable    
Due Date       2017    
AEP Generating Co [Member] | Senior Unsecured Notes One [Member]            
Long-term Debt and Other Securities Issued, Retired and Principal Payments Made            
Retirements and Principal Payments       $ 4,000    
Interest Rate (Percentage)   6.33%   6.33%    
Due Date       2037    
AEP Texas Central Co [Member] | Securitization Bonds One [Member]            
Long-term Debt and Other Securities Issued, Retired and Principal Payments Made            
Retirements and Principal Payments       $ 27,000    
Interest Rate (Percentage)   0.88%   0.88%    
Due Date       2017    
AEP Texas Central Co [Member] | Securitization Bonds Two [Member]            
Long-term Debt and Other Securities Issued, Retired and Principal Payments Made            
Retirements and Principal Payments       $ 78,000    
Interest Rate (Percentage)   5.09%   5.09%    
Due Date       2015    
AEP Texas Central Co [Member] | Securitization Bonds Three [Member]            
Long-term Debt and Other Securities Issued, Retired and Principal Payments Made            
Retirements and Principal Payments       $ 42,000    
Interest Rate (Percentage)   6.25%   6.25%    
Due Date       2016    
AEP Texas Central Co [Member] | Securitization Bonds Four [Member] | Subsequent Event [Member]            
Long-term Debt and Other Securities Issued, Retired and Principal Payments Made            
Retirements and Principal Payments $ 94,000          
Appalachian Power Co [Member]            
Long-term Debt            
Total Long-term Debt Outstanding   $ 3,966,647   $ 3,966,647   3,980,274
Long-term Debt Due Within One Year   252,410   252,410   552,212
Long-term Debt   3,714,237   3,714,237   3,342,062
Long-term Debt and Other Securities Issued, Retired and Principal Payments Made            
Retirements and Principal Payments       661,055 $ 500,016  
Utility Money Pool Participants' Money Pool Activity and Authorized Borrowing Limits            
Maximum Borrowings from Utility Money Pool       82,417    
Maximum Loans to Utility Money Pool       694,785    
Average Borrowings from Utility Money Pool       58,723    
Average Loans to Utility Money Pool       133,887    
Net Loans (Borrowings) to/from Utility Money Pool   (33,703)   (33,703)    
Authorized Short-term Borrowing Limit       $ 600,000    
Maximum and Minimum Interest Rates            
Maximum Interest Rate       0.59% 0.33%  
Minimum Interest Rate       0.39% 0.24%  
Average Interest Rates for Funds Borrowed from and Loaned to Utility Money Pool            
Average Interest Rate for Funds Borrowed       0.45% 0.26%  
Average Interest Rate for Funds Loaned       0.46% 0.29%  
Accounts Receivable and Accrued Unbilled Revenues            
Accounts Receivable and Accrued Unbilled Revenues   139,005   $ 139,005   159,823
Fees Paid to AEP Credit for Customer Accounts Receivable Sold            
Fees Paid to AEP Credit for Customer Accounts Receivable Sold   1,573 2,037 4,027 $ 4,460  
Proceeds from Sale of Receivables            
Proceeds from Sale of Receivables to AEP Credit   $ 330,593 345,963 $ 760,217 783,159  
Financing Activities (Textuals) [Abstract]            
Maximum Percentage Debt to Capitalization       67.50%    
Appalachian Power Co [Member] | Securitization Bonds One [Member]            
Long-term Debt and Other Securities Issued, Retired and Principal Payments Made            
Retirements and Principal Payments       $ 11,037    
Interest Rate (Percentage)   2.008%   2.008%    
Due Date       2024    
Appalachian Power Co [Member] | Notes Payable Affiliated [Member]            
Long-term Debt and Other Securities Issued, Retired and Principal Payments Made            
Retirements and Principal Payments       $ 86,000    
Interest Rate (Percentage)   3.125%   3.125%    
Due Date       2015    
Appalachian Power Co [Member] | Pollution Control Bonds One [Member]            
Long-term Debt and Other Securities Issued, Retired and Principal Payments Made            
Issuances [5]       $ 86,000    
Interest Rate (Percentage)   1.90%   1.90%    
Due Date       2019    
Appalachian Power Co [Member] | Senior Unsecured Notes One [Member]            
Long-term Debt and Other Securities Issued, Retired and Principal Payments Made            
Issuances [5]       $ 350,000    
Interest Rate (Percentage)   4.45%   4.45%    
Due Date       2045    
Appalachian Power Co [Member] | Senior Unsecured Notes Two [Member]            
Long-term Debt and Other Securities Issued, Retired and Principal Payments Made            
Issuances [5]       $ 300,000    
Interest Rate (Percentage)   3.40%   3.40%    
Due Date       2025    
Appalachian Power Co [Member] | Senior Unsecured Notes Three [Member]            
Long-term Debt and Other Securities Issued, Retired and Principal Payments Made            
Retirements and Principal Payments       $ 350,000    
Interest Rate (Percentage)   7.95%   7.95%    
Due Date       2020    
Appalachian Power Co [Member] | Senior Unsecured Notes Four [Member]            
Long-term Debt and Other Securities Issued, Retired and Principal Payments Made            
Retirements and Principal Payments       $ 300,000    
Interest Rate (Percentage)   3.40%   3.40%    
Due Date       2015    
Appalachian Power Co [Member] | Land Note [Member]            
Long-term Debt and Other Securities Issued, Retired and Principal Payments Made            
Retirements and Principal Payments       $ 18    
Interest Rate (Percentage)   13.718%   13.718%    
Due Date       2026    
Indiana Michigan Power Co [Member]            
Long-term Debt            
Total Long-term Debt Outstanding   $ 2,088,913   $ 2,088,913   2,027,397
Long-term Debt Due Within One Year   312,370   312,370   382,187
Long-term Debt   1,776,543   1,776,543   1,645,210
Long-term Debt and Other Securities Issued, Retired and Principal Payments Made            
Retirements and Principal Payments       150,077 $ 160,292  
Utility Money Pool Participants' Money Pool Activity and Authorized Borrowing Limits            
Maximum Borrowings from Utility Money Pool       200,032    
Maximum Loans to Utility Money Pool       13,515    
Average Borrowings from Utility Money Pool       141,520    
Average Loans to Utility Money Pool       13,501    
Net Loans (Borrowings) to/from Utility Money Pool   (127,154)   (127,154)    
Authorized Short-term Borrowing Limit       $ 500,000    
Maximum and Minimum Interest Rates            
Maximum Interest Rate       0.59% 0.33%  
Minimum Interest Rate       0.39% 0.24%  
Average Interest Rates for Funds Borrowed from and Loaned to Utility Money Pool            
Average Interest Rate for Funds Borrowed       0.47% 0.26%  
Average Interest Rate for Funds Loaned       0.47% 0.30%  
Accounts Receivable and Accrued Unbilled Revenues            
Accounts Receivable and Accrued Unbilled Revenues   145,633   $ 145,633   137,459
Fees Paid to AEP Credit for Customer Accounts Receivable Sold            
Fees Paid to AEP Credit for Customer Accounts Receivable Sold   2,063 1,785 4,420 $ 3,825  
Proceeds from Sale of Receivables            
Proceeds from Sale of Receivables to AEP Credit   371,058 353,030 790,619 760,180  
Financing Activities (Textuals) [Abstract]            
Reacquired Pollution Controls Bonds Held by Trustees   $ 40,000   $ 40,000    
Maximum Percentage Debt to Capitalization       67.50%    
Indiana Michigan Power Co [Member] | Notes Payable One [Member]            
Long-term Debt and Other Securities Issued, Retired and Principal Payments Made            
Issuances [5]       $ 111,300    
Interest Rate (Variable)       Variable    
Due Date       2019    
Indiana Michigan Power Co [Member] | Notes Payable Two [Member]            
Long-term Debt and Other Securities Issued, Retired and Principal Payments Made            
Retirements and Principal Payments       $ 18,600    
Interest Rate (Variable)       Variable    
Due Date       2016    
Indiana Michigan Power Co [Member] | Notes Payable Three [Member]            
Long-term Debt and Other Securities Issued, Retired and Principal Payments Made            
Retirements and Principal Payments       $ 13,659    
Interest Rate (Variable)       Variable    
Due Date       2017    
Indiana Michigan Power Co [Member] | Notes Payable Four [Member]            
Long-term Debt and Other Securities Issued, Retired and Principal Payments Made            
Retirements and Principal Payments       $ 16,501    
Interest Rate (Variable)       Variable    
Due Date       2019    
Indiana Michigan Power Co [Member] | Notes Payable Five [Member]            
Long-term Debt and Other Securities Issued, Retired and Principal Payments Made            
Retirements and Principal Payments       $ 5,834    
Interest Rate (Variable)       Variable    
Due Date       2019    
Indiana Michigan Power Co [Member] | Notes Payable Six [Member]            
Long-term Debt and Other Securities Issued, Retired and Principal Payments Made            
Retirements and Principal Payments       $ 844    
Interest Rate (Variable)       Variable    
Due Date       2016    
Indiana Michigan Power Co [Member] | Notes Payable Seven [Member]            
Long-term Debt and Other Securities Issued, Retired and Principal Payments Made            
Retirements and Principal Payments       $ 585    
Interest Rate (Percentage)   2.12%   2.12%    
Due Date       2016    
Indiana Michigan Power Co [Member] | Other Long Term Debt One [Member]            
Long-term Debt and Other Securities Issued, Retired and Principal Payments Made            
Issuances [5]       $ 100,000    
Interest Rate (Variable)       Variable    
Due Date       2018    
Indiana Michigan Power Co [Member] | Other Long Term Debt Two [Member]            
Long-term Debt and Other Securities Issued, Retired and Principal Payments Made            
Retirements and Principal Payments       $ 93,500    
Interest Rate (Variable)       Variable    
Due Date       2015    
Indiana Michigan Power Co [Member] | Other Long Term Debt Three [Member]            
Long-term Debt and Other Securities Issued, Retired and Principal Payments Made            
Retirements and Principal Payments       $ 554    
Interest Rate (Percentage)   6.00%   6.00%    
Due Date       2025    
Ohio Power Co [Member]            
Long-term Debt            
Total Long-term Debt Outstanding   $ 2,189,159   $ 2,189,159   2,297,123
Long-term Debt Due Within One Year   396,045   396,045   131,497
Long-term Debt   1,793,114   1,793,114   2,165,626
Long-term Debt and Other Securities Issued, Retired and Principal Payments Made            
Retirements and Principal Payments       108,238 $ 364,498  
Utility Money Pool Participants' Money Pool Activity and Authorized Borrowing Limits            
Maximum Borrowings from Utility Money Pool       0    
Maximum Loans to Utility Money Pool       367,472    
Average Borrowings from Utility Money Pool       0    
Average Loans to Utility Money Pool       273,487    
Net Loans (Borrowings) to/from Utility Money Pool   187,812   187,812    
Authorized Short-term Borrowing Limit       $ 400,000    
Maximum and Minimum Interest Rates            
Maximum Interest Rate       0.59% 0.33%  
Minimum Interest Rate       0.39% 0.24%  
Average Interest Rates for Funds Borrowed from and Loaned to Utility Money Pool            
Average Interest Rate for Funds Borrowed       0.00% 0.27%  
Average Interest Rate for Funds Loaned       0.47% 0.29%  
Accounts Receivable and Accrued Unbilled Revenues            
Accounts Receivable and Accrued Unbilled Revenues   366,098   $ 366,098   365,834
Fees Paid to AEP Credit for Customer Accounts Receivable Sold            
Fees Paid to AEP Credit for Customer Accounts Receivable Sold   6,668 6,647 14,683 $ 14,145  
Proceeds from Sale of Receivables            
Proceeds from Sale of Receivables to AEP Credit   563,381 626,025 1,278,365 1,312,652  
Financing Activities (Textuals) [Abstract]            
Reacquired Pollution Controls Bonds Held by Trustees   $ 345,000   345,000    
Ohio Power Co [Member] | Securitization Bonds One [Member]            
Long-term Debt and Other Securities Issued, Retired and Principal Payments Made            
Retirements and Principal Payments       $ 22,200    
Interest Rate (Percentage)   0.958%   0.958%    
Due Date       2018    
Ohio Power Co [Member] | Securitization Bonds Two [Member] | Subsequent Event [Member]            
Long-term Debt and Other Securities Issued, Retired and Principal Payments Made            
Retirements and Principal Payments 23,000          
Ohio Power Co [Member] | Pollution Control Bonds One [Member]            
Long-term Debt and Other Securities Issued, Retired and Principal Payments Made            
Retirements and Principal Payments       $ 86,000    
Interest Rate (Percentage)   3.125%   3.125%    
Due Date       2015    
Ohio Power Co [Member] | Other Long Term Debt One [Member]            
Long-term Debt and Other Securities Issued, Retired and Principal Payments Made            
Retirements and Principal Payments       $ 38    
Interest Rate (Percentage)   1.149%   1.149%    
Due Date       2028    
Public Service Co Of Oklahoma [Member]            
Long-term Debt            
Total Long-term Debt Outstanding   $ 1,290,995   $ 1,290,995   1,041,036
Long-term Debt Due Within One Year   434   434   427
Long-term Debt   1,290,561   1,290,561   1,040,609
Long-term Debt and Other Securities Issued, Retired and Principal Payments Made            
Retirements and Principal Payments       212 $ 33,906  
Utility Money Pool Participants' Money Pool Activity and Authorized Borrowing Limits            
Maximum Borrowings from Utility Money Pool       165,947    
Maximum Loans to Utility Money Pool       95,472    
Average Borrowings from Utility Money Pool       113,117    
Average Loans to Utility Money Pool       51,855    
Net Loans (Borrowings) to/from Utility Money Pool   64,212   64,212    
Authorized Short-term Borrowing Limit       $ 300,000    
Maximum and Minimum Interest Rates            
Maximum Interest Rate       0.59% 0.33%  
Minimum Interest Rate       0.39% 0.24%  
Average Interest Rates for Funds Borrowed from and Loaned to Utility Money Pool            
Average Interest Rate for Funds Borrowed       0.49% 0.28%  
Average Interest Rate for Funds Loaned       0.47% 0.00%  
Accounts Receivable and Accrued Unbilled Revenues            
Accounts Receivable and Accrued Unbilled Revenues   131,940   $ 131,940   112,905
Fees Paid to AEP Credit for Customer Accounts Receivable Sold            
Fees Paid to AEP Credit for Customer Accounts Receivable Sold   1,324 1,349 2,746 $ 2,672  
Proceeds from Sale of Receivables            
Proceeds from Sale of Receivables to AEP Credit   $ 311,885 325,536 $ 614,386 615,753  
Financing Activities (Textuals) [Abstract]            
Maximum Percentage Debt to Capitalization       67.50%    
Public Service Co Of Oklahoma [Member] | Senior Unsecured Notes One [Member]            
Long-term Debt and Other Securities Issued, Retired and Principal Payments Made            
Issuances [5]       $ 125,000    
Interest Rate (Percentage)   3.17%   3.17%    
Due Date       2025    
Public Service Co Of Oklahoma [Member] | Senior Unsecured Notes Two [Member]            
Long-term Debt and Other Securities Issued, Retired and Principal Payments Made            
Issuances [5]       $ 125,000    
Interest Rate (Percentage)   4.09%   4.09%    
Due Date       2045    
Public Service Co Of Oklahoma [Member] | Other Long Term Debt One [Member]            
Long-term Debt and Other Securities Issued, Retired and Principal Payments Made            
Retirements and Principal Payments       $ 212    
Interest Rate (Percentage)   3.00%   3.00%    
Due Date       2027    
Southwestern Electric Power Co [Member]            
Long-term Debt            
Total Long-term Debt Outstanding   $ 2,435,478   $ 2,435,478   2,140,437
Long-term Debt Due Within One Year   153,250   153,250   306,750
Long-term Debt   2,282,228   2,282,228   1,833,687
Long-term Debt and Other Securities Issued, Retired and Principal Payments Made            
Retirements and Principal Payments       155,125 $ 1,625  
Utility Money Pool Participants' Money Pool Activity and Authorized Borrowing Limits            
Maximum Borrowings from Utility Money Pool       112,481    
Maximum Loans to Utility Money Pool       299,932    
Average Borrowings from Utility Money Pool       52,596    
Average Loans to Utility Money Pool       170,502    
Net Loans (Borrowings) to/from Utility Money Pool   179,709   179,709    
Authorized Short-term Borrowing Limit       $ 350,000    
Maximum and Minimum Interest Rates            
Maximum Interest Rate       0.59% 0.33%  
Minimum Interest Rate       0.39% 0.24%  
Average Interest Rates for Funds Borrowed from and Loaned to Utility Money Pool            
Average Interest Rate for Funds Borrowed       0.46% 0.28%  
Average Interest Rate for Funds Loaned       0.49% 0.00%  
Accounts Receivable and Accrued Unbilled Revenues            
Accounts Receivable and Accrued Unbilled Revenues   163,994   $ 163,994   $ 148,668
Fees Paid to AEP Credit for Customer Accounts Receivable Sold            
Fees Paid to AEP Credit for Customer Accounts Receivable Sold   1,625 1,579 3,347 $ 3,145  
Proceeds from Sale of Receivables            
Proceeds from Sale of Receivables to AEP Credit   $ 381,100 $ 420,909 $ 754,267 $ 811,497  
Financing Activities (Textuals) [Abstract]            
Maximum Percentage Debt to Capitalization       67.50%    
Southwestern Electric Power Co [Member] | Notes Payable One [Member]            
Long-term Debt and Other Securities Issued, Retired and Principal Payments Made            
Retirements and Principal Payments       $ 1,625    
Interest Rate (Percentage)   4.58%   4.58%    
Due Date       2032    
Southwestern Electric Power Co [Member] | Pollution Control Bonds One [Member]            
Long-term Debt and Other Securities Issued, Retired and Principal Payments Made            
Issuances [5]       $ 53,500    
Interest Rate (Percentage)   1.60%   1.60%    
Due Date       2019    
Southwestern Electric Power Co [Member] | Pollution Control Bonds Two [Member]            
Long-term Debt and Other Securities Issued, Retired and Principal Payments Made            
Retirements and Principal Payments       $ 53,500    
Interest Rate (Percentage)   3.25%   3.25%    
Due Date       2015    
Southwestern Electric Power Co [Member] | Senior Unsecured Notes One [Member]            
Long-term Debt and Other Securities Issued, Retired and Principal Payments Made            
Issuances [5]       $ 400,000    
Interest Rate (Percentage)   3.90%   3.90%    
Due Date       2045    
Southwestern Electric Power Co [Member] | Senior Unsecured Notes Two [Member] | Subsequent Event [Member]            
Long-term Debt and Other Securities Issued, Retired and Principal Payments Made            
Retirements and Principal Payments $ 150,000          
Interest Rate (Percentage) 4.90%          
Due Date 2015          
Southwestern Electric Power Co [Member] | Senior Unsecured Notes Three [Member]            
Long-term Debt and Other Securities Issued, Retired and Principal Payments Made            
Retirements and Principal Payments       $ 100,000    
Interest Rate (Percentage)   5.375%   5.375%    
Due Date       2015    
AEP Transmission Company, LLC [Member] | Senior Unsecured Notes One [Member]            
Long-term Debt and Other Securities Issued, Retired and Principal Payments Made            
Issuances       $ 60,000    
Interest Rate (Percentage)   4.01%   4.01%    
Due Date       2030    
AEP Transmission Company, LLC [Member] | Senior Unsecured Notes Two [Member]            
Long-term Debt and Other Securities Issued, Retired and Principal Payments Made            
Issuances       $ 50,000    
Interest Rate (Percentage)   3.66%   3.66%    
Due Date       2025    
AEP Transmission Company, LLC [Member] | Senior Unsecured Notes Three [Member]            
Long-term Debt and Other Securities Issued, Retired and Principal Payments Made            
Issuances       $ 40,000    
Interest Rate (Percentage)   3.76%   3.76%    
Due Date       2025    
Kentucky Power Co [Member] | Other Long Term Debt One [Member]            
Long-term Debt and Other Securities Issued, Retired and Principal Payments Made            
Issuances       $ 25,000    
Interest Rate (Variable)       Variable    
Due Date       2018    
Transource Missouri [Member] | Other Long Term Debt One [Member]            
Long-term Debt and Other Securities Issued, Retired and Principal Payments Made            
Issuances       $ 13,000    
Interest Rate (Variable)       Variable    
Due Date       2018    
AEP Generation Resources [Member] | Other Long Term Debt One [Member]            
Long-term Debt and Other Securities Issued, Retired and Principal Payments Made            
Issuances       $ 500,000    
Interest Rate (Variable)       Variable    
Due Date       2017    
AEP Generation Resources [Member] | Other Long Term Debt Two [Member]            
Long-term Debt and Other Securities Issued, Retired and Principal Payments Made            
Retirements and Principal Payments       $ 500,000    
Interest Rate (Variable)       Variable    
Due Date       2015    
Wheeling Power Co [Member] | Senior Unsecured Notes One [Member]            
Long-term Debt and Other Securities Issued, Retired and Principal Payments Made            
Issuances       $ 113,000    
Interest Rate (Percentage)   3.36%   3.36%    
Due Date       2022    
Wheeling Power Co [Member] | Senior Unsecured Notes Two [Member]            
Long-term Debt and Other Securities Issued, Retired and Principal Payments Made            
Issuances       $ 122,000    
Interest Rate (Percentage)   3.70%   3.70%    
Due Date       2025    
Wheeling Power Co [Member] | Senior Unsecured Notes Three [Member]            
Long-term Debt and Other Securities Issued, Retired and Principal Payments Made            
Issuances       $ 50,000    
Interest Rate (Percentage)   4.20%   4.20%    
Due Date       2035    
[1] Pursuant to the Nuclear Waste Policy Act of 1982, I&M, a nuclear licensee, has an obligation to the United States Department of Energy for spent nuclear fuel disposal. The obligation includes a one-time fee for nuclear fuel consumed prior to April 7, 1983. Trust fund assets related to this obligation were $309 million and $309 million as of June 30, 2015 and December 31, 2014, respectively, and are included in Spent Nuclear Fuel and Decommissioning Trusts on our condensed balance sheets.
[2] Amount indicated on the statement of cash flows is net of issuance costs and premium or discount and will not tie to the issuance amount.
[3] Amount of securitized debt for receivables as accounted for under the ''Transfers and Servicing'' accounting guidance
[4] Weighted average rate.
[5] Amounts indicated on the statements of cash flows are net of issuance costs and premium or discount and will not tie to the issuance amounts.