Variable Interest Entities (Details) $ in Millions |
12 Months Ended |
Dec. 31, 2017
USD ($)
MW
|
Dec. 31, 2016
USD ($)
|
Dec. 31, 2015
USD ($)
|
Variable Interest Entities (Textuals) [Abstract] |
|
|
|
|
|
|
Securitization Bonds |
|
$ 1,416.5
|
|
$ 1,705.0
|
|
|
Securitized Transition Assets |
|
1,211.2
|
|
1,486.1
|
|
|
PATH-WV Refund |
|
$ 11.4
|
|
|
|
|
Percentage of Ownership of Allegheny Series by a Nonaffiliated Company |
|
100.00%
|
|
|
|
|
AEP Texas Central Transition Funding Co [Member] |
|
|
|
|
|
|
Variable Interest Entities (Textuals) [Abstract] |
|
|
|
|
|
|
Securitization Bonds |
|
$ 1,000.0
|
|
1,200.0
|
|
|
Securitized Transition Assets |
|
870.0
|
|
1,100.0
|
|
|
AEP Texas Central Transition Funding Co [Member] | Current Assets [Member] |
|
|
|
|
|
|
ASSETS |
|
|
|
|
|
|
Assets |
|
191.7
|
|
184.8
|
|
|
AEP Texas Central Transition Funding Co [Member] | Net Property Plant And Equipment [Member] |
|
|
|
|
|
|
ASSETS |
|
|
|
|
|
|
Assets |
|
0.0
|
|
0.0
|
|
|
AEP Texas Central Transition Funding Co [Member] | Other Noncurrent Assets [Member] |
|
|
|
|
|
|
ASSETS |
|
|
|
|
|
|
Assets |
|
923.5
|
[1] |
1,149.4
|
[2] |
|
AEP Texas Central Transition Funding Co [Member] | Total Assets [Member] |
|
|
|
|
|
|
ASSETS |
|
|
|
|
|
|
Assets |
|
1,115.2
|
|
1,334.2
|
|
|
AEP Texas Central Transition Funding Co [Member] | Current Liabilities [Member] |
|
|
|
|
|
|
LIABILITIES AND EQUITY |
|
|
|
|
|
|
Liabilities and Equity |
|
260.9
|
|
251.9
|
|
|
AEP Texas Central Transition Funding Co [Member] | Noncurrent Liabilities [Member] |
|
|
|
|
|
|
LIABILITIES AND EQUITY |
|
|
|
|
|
|
Liabilities and Equity |
|
836.1
|
|
1,064.2
|
|
|
AEP Texas Central Transition Funding Co [Member] | Equity [Member] |
|
|
|
|
|
|
LIABILITIES AND EQUITY |
|
|
|
|
|
|
Liabilities and Equity |
|
18.2
|
|
18.1
|
|
|
AEP Texas Central Transition Funding Co [Member] | Total Liabilities And Equity [Member] |
|
|
|
|
|
|
LIABILITIES AND EQUITY |
|
|
|
|
|
|
Liabilities and Equity |
|
1,115.2
|
|
1,334.2
|
|
|
Protected Cell Of Energy Insurance Services, Inc. [Member] |
|
|
|
|
|
|
Variable Interest Entities (Textuals) [Abstract] |
|
|
|
|
|
|
Insurance Premium Expense to Protected Cell |
|
29.0
|
|
28.0
|
|
$ 29.0
|
Protected Cell Of Energy Insurance Services, Inc. [Member] | Current Assets [Member] |
|
|
|
|
|
|
ASSETS |
|
|
|
|
|
|
Assets |
|
178.7
|
|
170.6
|
|
|
Protected Cell Of Energy Insurance Services, Inc. [Member] | Net Property Plant And Equipment [Member] |
|
|
|
|
|
|
ASSETS |
|
|
|
|
|
|
Assets |
|
0.0
|
|
0.0
|
|
|
Protected Cell Of Energy Insurance Services, Inc. [Member] | Other Noncurrent Assets [Member] |
|
|
|
|
|
|
ASSETS |
|
|
|
|
|
|
Assets |
|
0.0
|
|
1.1
|
|
|
Protected Cell Of Energy Insurance Services, Inc. [Member] | Total Assets [Member] |
|
|
|
|
|
|
ASSETS |
|
|
|
|
|
|
Assets |
|
178.7
|
|
171.7
|
|
|
Protected Cell Of Energy Insurance Services, Inc. [Member] | Current Liabilities [Member] |
|
|
|
|
|
|
LIABILITIES AND EQUITY |
|
|
|
|
|
|
Liabilities and Equity |
|
36.4
|
|
31.8
|
|
|
Protected Cell Of Energy Insurance Services, Inc. [Member] | Noncurrent Liabilities [Member] |
|
|
|
|
|
|
LIABILITIES AND EQUITY |
|
|
|
|
|
|
Liabilities and Equity |
|
95.2
|
|
97.3
|
|
|
Protected Cell Of Energy Insurance Services, Inc. [Member] | Equity [Member] |
|
|
|
|
|
|
LIABILITIES AND EQUITY |
|
|
|
|
|
|
Liabilities and Equity |
|
47.1
|
|
42.6
|
|
|
Protected Cell Of Energy Insurance Services, Inc. [Member] | Total Liabilities And Equity [Member] |
|
|
|
|
|
|
LIABILITIES AND EQUITY |
|
|
|
|
|
|
Liabilities and Equity |
|
178.7
|
|
171.7
|
|
|
Transource Energy [Member] |
|
|
|
|
|
|
Variable Interest Entities (Textuals) [Abstract] |
|
|
|
|
|
|
Proceeds from Partnership Contribution |
|
5.0
|
|
45.0
|
|
|
Transource Energy [Member] | Current Assets [Member] |
|
|
|
|
|
|
ASSETS |
|
|
|
|
|
|
Assets |
|
17.4
|
|
16.3
|
|
|
Transource Energy [Member] | Net Property Plant And Equipment [Member] |
|
|
|
|
|
|
ASSETS |
|
|
|
|
|
|
Assets |
|
323.9
|
|
313.0
|
|
|
Transource Energy [Member] | Other Noncurrent Assets [Member] |
|
|
|
|
|
|
ASSETS |
|
|
|
|
|
|
Assets |
|
3.1
|
|
5.4
|
|
|
Transource Energy [Member] | Total Assets [Member] |
|
|
|
|
|
|
ASSETS |
|
|
|
|
|
|
Assets |
|
344.4
|
|
334.7
|
|
|
Transource Energy [Member] | Current Liabilities [Member] |
|
|
|
|
|
|
LIABILITIES AND EQUITY |
|
|
|
|
|
|
Liabilities and Equity |
|
12.4
|
|
31.7
|
|
|
Transource Energy [Member] | Noncurrent Liabilities [Member] |
|
|
|
|
|
|
LIABILITIES AND EQUITY |
|
|
|
|
|
|
Liabilities and Equity |
|
132.0
|
|
134.4
|
|
|
Transource Energy [Member] | Equity [Member] |
|
|
|
|
|
|
LIABILITIES AND EQUITY |
|
|
|
|
|
|
Liabilities and Equity |
|
200.0
|
|
168.6
|
|
|
Transource Energy [Member] | Total Liabilities And Equity [Member] |
|
|
|
|
|
|
LIABILITIES AND EQUITY |
|
|
|
|
|
|
Liabilities and Equity |
|
344.4
|
|
334.7
|
|
|
AEP Renewables [Member] |
|
|
|
|
|
|
Variable Interest Entities (Textuals) [Abstract] |
|
|
|
|
|
|
Proceeds from Partnership Contribution |
|
$ 140.0
|
|
|
|
|
AEP Renewables [Member] | Current Assets [Member] |
|
|
|
|
|
|
ASSETS |
|
|
|
|
|
|
Assets |
|
|
|
0.0
|
|
|
AEP Renewables [Member] | Net Property Plant And Equipment [Member] |
|
|
|
|
|
|
ASSETS |
|
|
|
|
|
|
Assets |
|
|
|
130.4
|
|
|
AEP Renewables [Member] | Other Noncurrent Assets [Member] |
|
|
|
|
|
|
ASSETS |
|
|
|
|
|
|
Assets |
|
|
|
9.0
|
|
|
AEP Renewables [Member] | Total Assets [Member] |
|
|
|
|
|
|
ASSETS |
|
|
|
|
|
|
Assets |
|
|
|
139.4
|
|
|
AEP Renewables [Member] | Current Liabilities [Member] |
|
|
|
|
|
|
LIABILITIES AND EQUITY |
|
|
|
|
|
|
Liabilities and Equity |
|
|
|
126.7
|
|
|
AEP Renewables [Member] | Noncurrent Liabilities [Member] |
|
|
|
|
|
|
LIABILITIES AND EQUITY |
|
|
|
|
|
|
Liabilities and Equity |
|
|
|
11.3
|
|
|
AEP Renewables [Member] | Equity [Member] |
|
|
|
|
|
|
LIABILITIES AND EQUITY |
|
|
|
|
|
|
Liabilities and Equity |
|
|
|
1.4
|
|
|
AEP Renewables [Member] | Total Liabilities And Equity [Member] |
|
|
|
|
|
|
LIABILITIES AND EQUITY |
|
|
|
|
|
|
Liabilities and Equity |
|
|
|
139.4
|
|
|
AEP Credit, Inc. [Member] |
|
|
|
|
|
|
Variable Interest Entities (Textuals) [Abstract] |
|
|
|
|
|
|
Minimum Percentage of Equity AEP Provides |
|
5.00%
|
|
|
|
|
Percentage Of Short Term Borrowing Needs In Excess Of Third Party Financings |
|
20.00%
|
|
|
|
|
AEP Credit, Inc. [Member] | Current Assets [Member] |
|
|
|
|
|
|
ASSETS |
|
|
|
|
|
|
Assets |
|
$ 926.3
|
|
945.7
|
|
|
AEP Credit, Inc. [Member] | Net Property Plant And Equipment [Member] |
|
|
|
|
|
|
ASSETS |
|
|
|
|
|
|
Assets |
|
0.0
|
|
0.0
|
|
|
AEP Credit, Inc. [Member] | Other Noncurrent Assets [Member] |
|
|
|
|
|
|
ASSETS |
|
|
|
|
|
|
Assets |
|
6.4
|
|
10.3
|
|
|
AEP Credit, Inc. [Member] | Total Assets [Member] |
|
|
|
|
|
|
ASSETS |
|
|
|
|
|
|
Assets |
|
932.7
|
|
956.0
|
|
|
AEP Credit, Inc. [Member] | Current Liabilities [Member] |
|
|
|
|
|
|
LIABILITIES AND EQUITY |
|
|
|
|
|
|
Liabilities and Equity |
|
872.0
|
|
877.4
|
|
|
AEP Credit, Inc. [Member] | Noncurrent Liabilities [Member] |
|
|
|
|
|
|
LIABILITIES AND EQUITY |
|
|
|
|
|
|
Liabilities and Equity |
|
0.7
|
|
0.6
|
|
|
AEP Credit, Inc. [Member] | Equity [Member] |
|
|
|
|
|
|
LIABILITIES AND EQUITY |
|
|
|
|
|
|
Liabilities and Equity |
|
60.0
|
|
78.0
|
|
|
AEP Credit, Inc. [Member] | Total Liabilities And Equity [Member] |
|
|
|
|
|
|
LIABILITIES AND EQUITY |
|
|
|
|
|
|
Liabilities and Equity |
|
$ 932.7
|
|
956.0
|
|
|
PATH West Virginia Transmission Co, LLC [Member] |
|
|
|
|
|
|
Variable Interest Entities (Textuals) [Abstract] |
|
|
|
|
|
|
Percentage of Debt Capital Structure in PATH's Stipulation Agreement |
|
50.00%
|
|
|
|
|
Percentage of Equity Capital Structure in PATH's Stipulation Agreement |
|
50.00%
|
|
|
|
|
Percentage of Cost of Long Term Debt for PATH's Stipulation Agreement |
|
4.70%
|
|
|
|
|
Percentage of PATH WV's Lowered Authorized ROE |
|
8.11%
|
|
|
|
|
Percentage of PATH WV's Previously Authorized ROE |
|
10.40%
|
|
|
|
|
PATH West Virginia Transmission Co, LLC [Member] | Capital Contribution From Parent [Member] |
|
|
|
|
|
|
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures [Abstract] |
|
|
|
|
|
|
As Reported on the Balance Sheet |
|
$ 18.8
|
|
18.8
|
|
|
Maximum Exposure |
|
18.8
|
|
18.8
|
|
|
PATH West Virginia Transmission Co, LLC [Member] | Retained Earnings [Member] |
|
|
|
|
|
|
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures [Abstract] |
|
|
|
|
|
|
As Reported on the Balance Sheet |
|
(2.0)
|
|
(2.3)
|
|
|
Maximum Exposure |
|
(2.0)
|
|
(2.3)
|
|
|
PATH West Virginia Transmission Co, LLC [Member] | Total Investment [Member] |
|
|
|
|
|
|
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures [Abstract] |
|
|
|
|
|
|
As Reported on the Balance Sheet |
|
16.8
|
|
16.5
|
|
|
Maximum Exposure |
|
$ 16.8
|
|
16.5
|
|
|
Ohio Valley Electric Corporation [Member] |
|
|
|
|
|
|
Variable Interest Entities (Textuals) [Abstract] |
|
|
|
|
|
|
AEP's Ownership In OVEC |
|
43.47%
|
|
|
|
|
Intercompany Power Agreement End Date |
|
2040
|
|
|
|
|
Approximate OVEC Generating Capacity (MWs) | MW |
|
2,400
|
|
|
|
|
Outstanding Indebtedness |
|
$ 1,400.0
|
|
|
|
|
Ohio Valley Electric Corporation [Member] | Capital Contribution From Parent [Member] |
|
|
|
|
|
|
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures [Abstract] |
|
|
|
|
|
|
As Reported on the Balance Sheet |
|
4.4
|
|
4.4
|
|
|
Maximum Exposure |
|
4.4
|
|
4.4
|
|
|
Ohio Valley Electric Corporation [Member] | AEP's Ratio of OVEC Debt [Member] |
|
|
|
|
|
|
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures [Abstract] |
|
|
|
|
|
|
As Reported on the Balance Sheet |
|
0.0
|
|
0.0
|
|
|
Maximum Exposure |
[3] |
626.3
|
|
658.3
|
|
|
Ohio Valley Electric Corporation [Member] | Total Investment [Member] |
|
|
|
|
|
|
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures [Abstract] |
|
|
|
|
|
|
As Reported on the Balance Sheet |
|
4.4
|
|
4.4
|
|
|
Maximum Exposure |
|
$ 630.7
|
|
662.7
|
|
|
Parent Company [Member] | Ohio Valley Electric Corporation [Member] |
|
|
|
|
|
|
Variable Interest Entities (Textuals) [Abstract] |
|
|
|
|
|
|
AEP's Ownership In OVEC |
|
39.17%
|
|
|
|
|
Great Plains Energy Inc. [Member] | Transource Energy [Member] |
|
|
|
|
|
|
Variable Interest Entities (Textuals) [Abstract] |
|
|
|
|
|
|
Equity and Voting Ownership Percentage |
|
13.50%
|
|
|
|
|
Cleco Power, LLC [Member] |
|
|
|
|
|
|
Variable Interest Entities (Textuals) [Abstract] |
|
|
|
|
|
|
Percentage of VIE Sales of Lignite Produced |
|
50.00%
|
|
|
|
|
AEP Transmission Co [Member] | Billings from AEP Service Corporation [Member] |
|
|
|
|
|
|
Variable Interest Entities (Textuals) [Abstract] |
|
|
|
|
|
|
Billings from VIE |
|
$ 188.9
|
|
131.1
|
|
108.4
|
AEP Transmission Co [Member] | Carrying Amount in AEP Service Corporation's Accounts Payable [Member] |
|
|
|
|
|
|
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures [Abstract] |
|
|
|
|
|
|
As Reported on the Balance Sheet |
|
25.1
|
|
23.0
|
|
|
Maximum Exposure |
|
25.1
|
|
23.0
|
|
|
Appalachian Power Co [Member] |
|
|
|
|
|
|
Variable Interest Entities (Textuals) [Abstract] |
|
|
|
|
|
|
Securitization Bonds |
|
295.9
|
|
318.9
|
|
|
Securitized Transition Assets |
|
282.3
|
|
305.3
|
|
|
Amount Of Power Purchased From O V E C |
|
101.0
|
|
88.0
|
|
87.2
|
Appalachian Power Co [Member] | Billings from AEP Service Corporation [Member] |
|
|
|
|
|
|
Variable Interest Entities (Textuals) [Abstract] |
|
|
|
|
|
|
Billings from VIE |
|
268.8
|
|
244.2
|
|
227.5
|
Appalachian Power Co [Member] | Carrying Amount in AEP Service Corporation's Accounts Payable [Member] |
|
|
|
|
|
|
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures [Abstract] |
|
|
|
|
|
|
As Reported on the Balance Sheet |
|
37.0
|
|
36.7
|
|
|
Maximum Exposure |
|
37.0
|
|
36.7
|
|
|
Appalachian Power Co [Member] | Appalachian Consumer Rate Relief Funding [Member] |
|
|
|
|
|
|
Variable Interest Entities (Textuals) [Abstract] |
|
|
|
|
|
|
Securitization Bonds |
|
296.0
|
|
319.0
|
|
|
Securitized Transition Assets |
|
282.0
|
|
305.0
|
|
|
Appalachian Power Co [Member] | Appalachian Consumer Rate Relief Funding [Member] | Current Assets [Member] |
|
|
|
|
|
|
ASSETS |
|
|
|
|
|
|
Assets |
|
22.3
|
|
20.2
|
|
|
Appalachian Power Co [Member] | Appalachian Consumer Rate Relief Funding [Member] | Net Property Plant And Equipment [Member] |
|
|
|
|
|
|
ASSETS |
|
|
|
|
|
|
Assets |
|
0.0
|
|
0.0
|
|
|
Appalachian Power Co [Member] | Appalachian Consumer Rate Relief Funding [Member] | Other Noncurrent Assets [Member] |
|
|
|
|
|
|
ASSETS |
|
|
|
|
|
|
Assets |
|
285.6
|
[4] |
309.0
|
[5] |
|
Variable Interest Entities (Textuals) [Abstract] |
|
|
|
|
|
|
Intercompany Item Eliminated in Consolidation |
|
3.4
|
|
3.7
|
|
|
Appalachian Power Co [Member] | Appalachian Consumer Rate Relief Funding [Member] | Total Assets [Member] |
|
|
|
|
|
|
ASSETS |
|
|
|
|
|
|
Assets |
|
307.9
|
|
329.2
|
|
|
Appalachian Power Co [Member] | Appalachian Consumer Rate Relief Funding [Member] | Current Liabilities [Member] |
|
|
|
|
|
|
LIABILITIES AND EQUITY |
|
|
|
|
|
|
Liabilities and Equity |
|
27.6
|
|
27.3
|
|
|
Appalachian Power Co [Member] | Appalachian Consumer Rate Relief Funding [Member] | Noncurrent Liabilities [Member] |
|
|
|
|
|
|
LIABILITIES AND EQUITY |
|
|
|
|
|
|
Liabilities and Equity |
|
278.4
|
|
300.6
|
|
|
Appalachian Power Co [Member] | Appalachian Consumer Rate Relief Funding [Member] | Equity [Member] |
|
|
|
|
|
|
LIABILITIES AND EQUITY |
|
|
|
|
|
|
Liabilities and Equity |
|
1.9
|
|
1.3
|
|
|
Appalachian Power Co [Member] | Appalachian Consumer Rate Relief Funding [Member] | Total Liabilities And Equity [Member] |
|
|
|
|
|
|
LIABILITIES AND EQUITY |
|
|
|
|
|
|
Liabilities and Equity |
|
$ 307.9
|
|
329.2
|
|
|
Appalachian Power Co [Member] | Ohio Valley Electric Corporation [Member] |
|
|
|
|
|
|
Variable Interest Entities (Textuals) [Abstract] |
|
|
|
|
|
|
Power Participation Ratio |
|
15.69%
|
|
|
|
|
Outstanding Indebtedness |
|
$ 226.0
|
|
237.6
|
|
|
Indiana Michigan Power Co [Member] |
|
|
|
|
|
|
Variable Interest Entities (Textuals) [Abstract] |
|
|
|
|
|
|
Amount Of Power Purchased From O V E C |
|
$ 50.5
|
|
44.0
|
|
43.7
|
Indiana Michigan Power Co [Member] | Rockport Generating Plant (Unit No. 1) [Member] |
|
|
|
|
|
|
Variable Interest Entities (Textuals) [Abstract] |
|
|
|
|
|
|
Jointly Owned Utility Plant, Proportionate Ownership Share |
|
50.00%
|
|
|
|
|
Indiana Michigan Power Co [Member] | DCC Fuel [Member] |
|
|
|
|
|
|
Variable Interest Entities (Textuals) [Abstract] |
|
|
|
|
|
|
Payments Made by I&M to DCC Fuel |
|
$ 136.0
|
|
101.0
|
|
115.0
|
Indiana Michigan Power Co [Member] | DCC Fuel [Member] | Current Assets [Member] |
|
|
|
|
|
|
ASSETS |
|
|
|
|
|
|
Assets |
|
102.5
|
|
135.5
|
|
|
Indiana Michigan Power Co [Member] | DCC Fuel [Member] | Net Property Plant And Equipment [Member] |
|
|
|
|
|
|
ASSETS |
|
|
|
|
|
|
Assets |
|
179.9
|
|
233.9
|
|
|
Indiana Michigan Power Co [Member] | DCC Fuel [Member] | Other Noncurrent Assets [Member] |
|
|
|
|
|
|
ASSETS |
|
|
|
|
|
|
Assets |
|
86.3
|
|
116.2
|
|
|
Indiana Michigan Power Co [Member] | DCC Fuel [Member] | Total Assets [Member] |
|
|
|
|
|
|
ASSETS |
|
|
|
|
|
|
Assets |
|
368.7
|
|
485.6
|
|
|
Indiana Michigan Power Co [Member] | DCC Fuel [Member] | Current Liabilities [Member] |
|
|
|
|
|
|
LIABILITIES AND EQUITY |
|
|
|
|
|
|
Liabilities and Equity |
|
96.5
|
|
131.3
|
|
|
Indiana Michigan Power Co [Member] | DCC Fuel [Member] | Noncurrent Liabilities [Member] |
|
|
|
|
|
|
LIABILITIES AND EQUITY |
|
|
|
|
|
|
Liabilities and Equity |
|
272.2
|
|
354.3
|
|
|
Indiana Michigan Power Co [Member] | DCC Fuel [Member] | Equity [Member] |
|
|
|
|
|
|
LIABILITIES AND EQUITY |
|
|
|
|
|
|
Liabilities and Equity |
|
0.0
|
|
0.0
|
|
|
Indiana Michigan Power Co [Member] | DCC Fuel [Member] | Total Liabilities And Equity [Member] |
|
|
|
|
|
|
LIABILITIES AND EQUITY |
|
|
|
|
|
|
Liabilities and Equity |
|
368.7
|
|
485.6
|
|
|
Indiana Michigan Power Co [Member] | Billings from AEP Service Corporation [Member] |
|
|
|
|
|
|
Variable Interest Entities (Textuals) [Abstract] |
|
|
|
|
|
|
Billings from VIE |
|
176.0
|
|
147.7
|
|
139.5
|
Indiana Michigan Power Co [Member] | Billings from AEP Generating Company [Member] |
|
|
|
|
|
|
Variable Interest Entities (Textuals) [Abstract] |
|
|
|
|
|
|
Billings from VIE |
|
224.0
|
|
229.0
|
|
232.0
|
Indiana Michigan Power Co [Member] | Carrying Amount in AEP Service Corporation's Accounts Payable [Member] |
|
|
|
|
|
|
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures [Abstract] |
|
|
|
|
|
|
As Reported on the Balance Sheet |
|
26.8
|
|
24.2
|
|
|
Maximum Exposure |
|
26.8
|
|
24.2
|
|
|
Indiana Michigan Power Co [Member] | Carrying Amount in AEP Generating Company's Accounts Payable [Member] |
|
|
|
|
|
|
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures [Abstract] |
|
|
|
|
|
|
As Reported on the Balance Sheet |
|
$ 23.0
|
|
22.0
|
|
|
Indiana Michigan Power Co [Member] | Ohio Valley Electric Corporation [Member] |
|
|
|
|
|
|
Variable Interest Entities (Textuals) [Abstract] |
|
|
|
|
|
|
Power Participation Ratio |
|
7.85%
|
|
|
|
|
Outstanding Indebtedness |
|
$ 113.1
|
|
118.9
|
|
|
Ohio Power Co [Member] |
|
|
|
|
|
|
Variable Interest Entities (Textuals) [Abstract] |
|
|
|
|
|
|
Securitization Bonds |
|
94.5
|
|
140.2
|
|
|
Securitized Transition Assets |
|
37.7
|
|
62.1
|
|
|
Amount Of Power Purchased From O V E C |
|
128.2
|
|
111.7
|
|
110.8
|
Ohio Power Co [Member] | Billings from AEP Service Corporation [Member] |
|
|
|
|
|
|
Variable Interest Entities (Textuals) [Abstract] |
|
|
|
|
|
|
Billings from VIE |
|
195.7
|
|
181.1
|
|
177.8
|
Ohio Power Co [Member] | Carrying Amount in AEP Service Corporation's Accounts Payable [Member] |
|
|
|
|
|
|
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures [Abstract] |
|
|
|
|
|
|
As Reported on the Balance Sheet |
|
27.4
|
|
28.1
|
|
|
Maximum Exposure |
|
27.4
|
|
28.1
|
|
|
Ohio Power Co [Member] | Ohio Phase-In-Recovery Funding [Member] |
|
|
|
|
|
|
Variable Interest Entities (Textuals) [Abstract] |
|
|
|
|
|
|
Securitization Bonds |
|
95.0
|
|
140.0
|
|
|
Securitized Transition Assets |
|
38.0
|
|
62.0
|
|
|
Ohio Power Co [Member] | Ohio Phase-In-Recovery Funding [Member] | Current Assets [Member] |
|
|
|
|
|
|
ASSETS |
|
|
|
|
|
|
Assets |
|
28.7
|
|
30.3
|
|
|
Ohio Power Co [Member] | Ohio Phase-In-Recovery Funding [Member] | Net Property Plant And Equipment [Member] |
|
|
|
|
|
|
ASSETS |
|
|
|
|
|
|
Assets |
|
0.0
|
|
0.0
|
|
|
Ohio Power Co [Member] | Ohio Phase-In-Recovery Funding [Member] | Other Noncurrent Assets [Member] |
|
|
|
|
|
|
ASSETS |
|
|
|
|
|
|
Assets |
|
71.0
|
[6] |
117.1
|
[7] |
|
Variable Interest Entities (Textuals) [Abstract] |
|
|
|
|
|
|
Intercompany Item Eliminated in Consolidation |
|
33.3
|
|
55.0
|
|
|
Ohio Power Co [Member] | Ohio Phase-In-Recovery Funding [Member] | Total Assets [Member] |
|
|
|
|
|
|
ASSETS |
|
|
|
|
|
|
Assets |
|
99.7
|
|
147.4
|
|
|
Ohio Power Co [Member] | Ohio Phase-In-Recovery Funding [Member] | Current Liabilities [Member] |
|
|
|
|
|
|
LIABILITIES AND EQUITY |
|
|
|
|
|
|
Liabilities and Equity |
|
47.9
|
|
47.5
|
|
|
Ohio Power Co [Member] | Ohio Phase-In-Recovery Funding [Member] | Noncurrent Liabilities [Member] |
|
|
|
|
|
|
LIABILITIES AND EQUITY |
|
|
|
|
|
|
Liabilities and Equity |
|
50.5
|
|
98.6
|
|
|
Ohio Power Co [Member] | Ohio Phase-In-Recovery Funding [Member] | Equity [Member] |
|
|
|
|
|
|
LIABILITIES AND EQUITY |
|
|
|
|
|
|
Liabilities and Equity |
|
1.3
|
|
1.3
|
|
|
Ohio Power Co [Member] | Ohio Phase-In-Recovery Funding [Member] | Total Liabilities And Equity [Member] |
|
|
|
|
|
|
LIABILITIES AND EQUITY |
|
|
|
|
|
|
Liabilities and Equity |
|
$ 99.7
|
|
147.4
|
|
|
Ohio Power Co [Member] | Ohio Valley Electric Corporation [Member] |
|
|
|
|
|
|
Variable Interest Entities (Textuals) [Abstract] |
|
|
|
|
|
|
AEP's Ownership In OVEC |
|
4.30%
|
|
|
|
|
Power Participation Ratio |
|
19.93%
|
|
|
|
|
Outstanding Indebtedness |
|
$ 287.2
|
|
301.8
|
|
|
Public Service Co Of Oklahoma [Member] | Billings from AEP Service Corporation [Member] |
|
|
|
|
|
|
Variable Interest Entities (Textuals) [Abstract] |
|
|
|
|
|
|
Billings from VIE |
|
114.7
|
|
111.0
|
|
107.3
|
Public Service Co Of Oklahoma [Member] | Carrying Amount in AEP Service Corporation's Accounts Payable [Member] |
|
|
|
|
|
|
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures [Abstract] |
|
|
|
|
|
|
As Reported on the Balance Sheet |
|
18.7
|
|
16.0
|
|
|
Maximum Exposure |
|
18.7
|
|
16.0
|
|
|
Southwestern Electric Power Co [Member] | Sabine Mining Co [Member] |
|
|
|
|
|
|
Variable Interest Entities (Textuals) [Abstract] |
|
|
|
|
|
|
Billings from VIE |
|
137.0
|
|
162.0
|
|
152.0
|
Southwestern Electric Power Co [Member] | Sabine Mining Co [Member] | Current Assets [Member] |
|
|
|
|
|
|
ASSETS |
|
|
|
|
|
|
Assets |
|
56.3
|
|
60.2
|
|
|
Southwestern Electric Power Co [Member] | Sabine Mining Co [Member] | Net Property Plant And Equipment [Member] |
|
|
|
|
|
|
ASSETS |
|
|
|
|
|
|
Assets |
|
113.2
|
|
112.0
|
|
|
Southwestern Electric Power Co [Member] | Sabine Mining Co [Member] | Other Noncurrent Assets [Member] |
|
|
|
|
|
|
ASSETS |
|
|
|
|
|
|
Assets |
|
90.2
|
|
89.8
|
|
|
Southwestern Electric Power Co [Member] | Sabine Mining Co [Member] | Total Assets [Member] |
|
|
|
|
|
|
ASSETS |
|
|
|
|
|
|
Assets |
|
259.7
|
|
262.0
|
|
|
Southwestern Electric Power Co [Member] | Sabine Mining Co [Member] | Current Liabilities [Member] |
|
|
|
|
|
|
LIABILITIES AND EQUITY |
|
|
|
|
|
|
Liabilities and Equity |
|
49.1
|
|
26.3
|
|
|
Southwestern Electric Power Co [Member] | Sabine Mining Co [Member] | Noncurrent Liabilities [Member] |
|
|
|
|
|
|
LIABILITIES AND EQUITY |
|
|
|
|
|
|
Liabilities and Equity |
|
211.0
|
|
235.3
|
|
|
Southwestern Electric Power Co [Member] | Sabine Mining Co [Member] | Equity [Member] |
|
|
|
|
|
|
LIABILITIES AND EQUITY |
|
|
|
|
|
|
Liabilities and Equity |
|
(0.4)
|
|
0.4
|
|
|
Southwestern Electric Power Co [Member] | Sabine Mining Co [Member] | Total Liabilities And Equity [Member] |
|
|
|
|
|
|
LIABILITIES AND EQUITY |
|
|
|
|
|
|
Liabilities and Equity |
|
259.7
|
|
262.0
|
|
|
Southwestern Electric Power Co [Member] | Billings from AEP Service Corporation [Member] |
|
|
|
|
|
|
Variable Interest Entities (Textuals) [Abstract] |
|
|
|
|
|
|
Billings from VIE |
|
150.7
|
|
147.0
|
|
141.4
|
Southwestern Electric Power Co [Member] | Carrying Amount in AEP Service Corporation's Accounts Payable [Member] |
|
|
|
|
|
|
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures [Abstract] |
|
|
|
|
|
|
As Reported on the Balance Sheet |
|
20.8
|
|
21.8
|
|
|
Maximum Exposure |
|
20.8
|
|
21.8
|
|
|
Southwestern Electric Power Co [Member] | Dolet Hills Lignite Co, LLC [Member] |
|
|
|
|
|
|
Variable Interest Entities (Textuals) [Abstract] |
|
|
|
|
|
|
Billings from VIE |
|
$ 61.0
|
|
65.0
|
|
93.0
|
Percentage of VIE Sales of Lignite Produced |
|
50.00%
|
|
|
|
|
Percentage of DHLCs Debt Guaranteed by Each SWEPCo and CLECO |
|
50.00%
|
|
|
|
|
Percentage of Management Fee Received by SWEPCo from DHLC |
|
100.00%
|
|
|
|
|
Southwestern Electric Power Co [Member] | Dolet Hills Lignite Co, LLC [Member] | Capital Contribution From Parent [Member] |
|
|
|
|
|
|
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures [Abstract] |
|
|
|
|
|
|
As Reported on the Balance Sheet |
|
$ 7.6
|
|
7.6
|
|
|
Maximum Exposure |
|
7.6
|
|
7.6
|
|
|
Southwestern Electric Power Co [Member] | Dolet Hills Lignite Co, LLC [Member] | Retained Earnings [Member] |
|
|
|
|
|
|
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures [Abstract] |
|
|
|
|
|
|
As Reported on the Balance Sheet |
|
11.8
|
|
15.7
|
|
|
Maximum Exposure |
|
11.8
|
|
15.7
|
|
|
Southwestern Electric Power Co [Member] | Dolet Hills Lignite Co, LLC [Member] | SWEPCo's Share of Obligations [Member] |
|
|
|
|
|
|
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures [Abstract] |
|
|
|
|
|
|
As Reported on the Balance Sheet |
|
0.0
|
|
0.0
|
|
|
Maximum Exposure |
|
144.3
|
|
91.3
|
|
|
Southwestern Electric Power Co [Member] | Dolet Hills Lignite Co, LLC [Member] | Total Investment [Member] |
|
|
|
|
|
|
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures [Abstract] |
|
|
|
|
|
|
As Reported on the Balance Sheet |
|
19.4
|
|
23.3
|
|
|
Maximum Exposure |
|
$ 163.7
|
|
114.6
|
|
|
AEP Generating Co [Member] | Rockport Generating Plant (Unit No. 1) [Member] |
|
|
|
|
|
|
Variable Interest Entities (Textuals) [Abstract] |
|
|
|
|
|
|
Jointly Owned Utility Plant, Proportionate Ownership Share |
|
50.00%
|
|
|
|
|
AEP Generating Co [Member] | Rockport Generating Plant (Unit No. 2) [Member] |
|
|
|
|
|
|
Variable Interest Entities (Textuals) [Abstract] |
|
|
|
|
|
|
Jointly Owned Utility Plant, Proportionate Ownership Share |
|
50.00%
|
|
|
|
|
Percentage Interest in Rockport Plant Unit 2 Lease |
|
50.00%
|
|
|
|
|
AEP Generating Co [Member] | Lawrenceburg Generating Station [Member] |
|
|
|
|
|
|
Variable Interest Entities (Textuals) [Abstract] |
|
|
|
|
|
|
Jointly Owned Utility Plant, Proportionate Ownership Share |
|
100.00%
|
|
|
|
|
Transource Energy [Member] |
|
|
|
|
|
|
Variable Interest Entities (Textuals) [Abstract] |
|
|
|
|
|
|
Equity and Voting Ownership Percentage |
|
86.50%
|
|
|
|
|
AEP Texas Inc. [Member] |
|
|
|
|
|
|
Variable Interest Entities (Textuals) [Abstract] |
|
|
|
|
|
|
Securitization Bonds |
|
$ 1,026.1
|
|
1,245.8
|
|
|
Securitized Transition Assets |
|
$ 891.2
|
|
1,118.7
|
|
|
Jointly Owned Utility Plant, Proportionate Ownership Share |
|
54.69%
|
|
|
|
|
AEP Texas Inc. [Member] | AEP Texas Central Transition Funding Co [Member] |
|
|
|
|
|
|
Variable Interest Entities (Textuals) [Abstract] |
|
|
|
|
|
|
Securitized Transition Assets |
|
$ 869.5
|
|
1,088.3
|
|
|
AEP Texas Inc. [Member] | AEP Texas Central Transition Funding Co [Member] | Other Noncurrent Assets [Member] |
|
|
|
|
|
|
Variable Interest Entities (Textuals) [Abstract] |
|
|
|
|
|
|
Intercompany Item Eliminated in Consolidation |
|
53.9
|
|
61.1
|
|
|
AEP Texas Inc. [Member] | Billings from AEP Service Corporation [Member] |
|
|
|
|
|
|
Variable Interest Entities (Textuals) [Abstract] |
|
|
|
|
|
|
Billings from VIE |
|
152.6
|
|
142.3
|
|
$ 132.7
|
AEP Texas Inc. [Member] | Carrying Amount in AEP Service Corporation's Accounts Payable [Member] |
|
|
|
|
|
|
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures [Abstract] |
|
|
|
|
|
|
As Reported on the Balance Sheet |
|
24.2
|
|
22.9
|
|
|
Maximum Exposure |
|
$ 24.2
|
|
$ 22.9
|
|
|
|
|