Variable Interest Entities (Details) (USD $)	3 Months Ended			6 Months Ended
	Jun. 30, 2014		Jun. 30, 2013	Jun. 30, 2014		Jun. 30, 2013	Dec. 31, 2013
Variable Interest Entities (Textuals) [Abstract]
Securitization Bonds	$ 2,547,000,000			$ 2,547,000,000			$ 2,686,000,000
Securitized Transition Assets	2,244,000,000			2,244,000,000			2,373,000,000
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 Texas Central Transition Funding Co [Member]
Variable Interest Entities (Textuals) [Abstract]
Securitization Bonds	1,900,000,000			1,900,000,000			2,000,000,000
Securitized Transition Assets	1,800,000,000			1,800,000,000			1,900,000,000
Protected Cell Of Energy Insurance Services, Inc. [Member]
Variable Interest Entities (Textuals) [Abstract]
Insurance Premium Expense to Protected Cell	1,400,000		14,000	18,000,000		15,000,000
PATH West Virginia Transmission Co, LLC [Member]
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures [Abstract]
As Reported on the Consolidated Balance Sheet	25,000,000			25,000,000			25,000,000
Maximum Exposure	25,000,000			25,000,000			25,000,000
Capital Contribution From Parent [Member] | PATH West Virginia Transmission Co, LLC [Member]
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures [Abstract]
As Reported on the Consolidated Balance Sheet	19,000,000			19,000,000			19,000,000
Maximum Exposure	19,000,000			19,000,000			19,000,000
Retained Earnings [Member] | PATH West Virginia Transmission Co, LLC [Member]
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures [Abstract]
As Reported on the Consolidated Balance Sheet	6,000,000			6,000,000			6,000,000
Maximum Exposure	6,000,000			6,000,000			6,000,000
Current Assets [Member] | AEP Credit, Inc. [Member]
ASSETS
Assets	1,048,000,000			1,048,000,000			935,000,000
Current Assets [Member] | AEP Texas Central Transition Funding Co [Member]
ASSETS
Assets	218,000,000			218,000,000			232,000,000
Current Assets [Member] | Protected Cell Of Energy Insurance Services, Inc. [Member]
ASSETS
Assets	152,000,000			152,000,000			143,000,000
Current Assets [Member] | Transource Energy [Member]
ASSETS
Assets	3,000,000			3,000,000
Net Property Plant And Equipment [Member] | AEP Credit, Inc. [Member]
ASSETS
Assets	0			0			0
Net Property Plant And Equipment [Member] | AEP Texas Central Transition Funding Co [Member]
ASSETS
Assets	0			0			0
Net Property Plant And Equipment [Member] | Protected Cell Of Energy Insurance Services, Inc. [Member]
ASSETS
Assets	0			0			0
Net Property Plant And Equipment [Member] | Transource Energy [Member]
ASSETS
Assets	73,000,000			73,000,000
Other Non Current Assets [Member] | AEP Credit, Inc. [Member]
ASSETS
Assets	1,000,000			1,000,000			1,000,000
Other Non Current Assets [Member] | AEP Texas Central Transition Funding Co [Member]
ASSETS
Assets	1,805,000,000	[1]		1,805,000,000	[1]		1,918,000,000	[2]
Variable Interest Entities (Textuals) [Abstract]
Intercompany Item Eliminated in Consolidation	79,000,000			79,000,000			82,000,000
Other Non Current Assets [Member] | Protected Cell Of Energy Insurance Services, Inc. [Member]
ASSETS
Assets	3,000,000			3,000,000			3,000,000
Other Non Current Assets [Member] | Transource Energy [Member]
ASSETS
Assets	4,000,000			4,000,000
Total Assets [Member] | AEP Credit, Inc. [Member]
ASSETS
Assets	1,049,000,000			1,049,000,000			936,000,000
Total Assets [Member] | AEP Texas Central Transition Funding Co [Member]
ASSETS
Assets	2,023,000,000			2,023,000,000			2,150,000,000
Total Assets [Member] | Protected Cell Of Energy Insurance Services, Inc. [Member]
ASSETS
Assets	155,000,000			155,000,000			146,000,000
Total Assets [Member] | Transource Energy [Member]
ASSETS
Assets	80,000,000			80,000,000
Current Liabilities [Member] | AEP Credit, Inc. [Member]
LIABILITIES AND EQUITY
Liabilities and Equity	948,000,000			948,000,000			827,000,000
Current Liabilities [Member] | AEP Texas Central Transition Funding Co [Member]
LIABILITIES AND EQUITY
Liabilities and Equity	320,000,000			320,000,000			312,000,000
Current Liabilities [Member] | Protected Cell Of Energy Insurance Services, Inc. [Member]
LIABILITIES AND EQUITY
Liabilities and Equity	41,000,000			41,000,000			39,000,000
Current Liabilities [Member] | Transource Energy [Member]
LIABILITIES AND EQUITY
Liabilities and Equity	14,000,000			14,000,000
Noncurrent Liabilities [Member] | AEP Credit, Inc. [Member]
LIABILITIES AND EQUITY
Liabilities and Equity	0			0			1,000,000
Noncurrent Liabilities [Member] | AEP Texas Central Transition Funding Co [Member]
LIABILITIES AND EQUITY
Liabilities and Equity	1,685,000,000			1,685,000,000			1,820,000,000
Noncurrent Liabilities [Member] | Protected Cell Of Energy Insurance Services, Inc. [Member]
LIABILITIES AND EQUITY
Liabilities and Equity	73,000,000			73,000,000			66,000,000
Noncurrent Liabilities [Member] | Transource Energy [Member]
LIABILITIES AND EQUITY
Liabilities and Equity	39,000,000			39,000,000
Equity [Member] | AEP Credit, Inc. [Member]
LIABILITIES AND EQUITY
Liabilities and Equity	101,000,000			101,000,000			108,000,000
Equity [Member] | AEP Texas Central Transition Funding Co [Member]
LIABILITIES AND EQUITY
Liabilities and Equity	18,000,000			18,000,000			18,000,000
Equity [Member] | Protected Cell Of Energy Insurance Services, Inc. [Member]
LIABILITIES AND EQUITY
Liabilities and Equity	41,000,000			41,000,000			41,000,000
Equity [Member] | Transource Energy [Member]
LIABILITIES AND EQUITY
Liabilities and Equity	27,000,000			27,000,000
Total Liabilities And Equity [Member] | AEP Credit, Inc. [Member]
LIABILITIES AND EQUITY
Liabilities and Equity	1,049,000,000			1,049,000,000			936,000,000
Total Liabilities And Equity [Member] | AEP Texas Central Transition Funding Co [Member]
LIABILITIES AND EQUITY
Liabilities and Equity	2,023,000,000			2,023,000,000			2,150,000,000
Total Liabilities And Equity [Member] | Protected Cell Of Energy Insurance Services, Inc. [Member]
LIABILITIES AND EQUITY
Liabilities and Equity	155,000,000			155,000,000			146,000,000
Total Liabilities And Equity [Member] | Transource Energy [Member]
LIABILITIES AND EQUITY
Liabilities and Equity	80,000,000			80,000,000
Great Plains Energy Inc. [Member] | Transource Energy [Member]
Variable Interest Entities (Textuals) [Abstract]
Equity and Voting Ownership Percentage	13.50%			13.50%
Transource Energy [Member]
Variable Interest Entities (Textuals) [Abstract]
Equity and Voting Ownership Percentage	86.50%			86.50%
Appalachian Power Co [Member]
Variable Interest Entities (Textuals) [Abstract]
Securitized Transition Assets	360,612,000			360,612,000			369,355,000
Appalachian Power Co [Member] | Appalachian Consumer Rate Relief Funding [Member]
Variable Interest Entities (Textuals) [Abstract]
Securitization Bonds	380,000,000			380,000,000			380,000,000
Securitized Transition Assets	361,000,000			361,000,000			369,000,000
Intercompany Item Eliminated in Consolidation	4,000,000			4,000,000			4,000,000
Appalachian Power Co [Member] | Billings from American Electric Power Service Corporation [Member]
Billings from Affiliates
Billings from VIE	53,959,000		41,496,000	104,096,000		80,537,000
Variable Interest Entities (Textuals) [Abstract]
Billings from VIE	53,959,000		41,496,000	104,096,000		80,537,000
Appalachian Power Co [Member] | Carrying Amount in AEPSC's Accounts Payable [Member]
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures [Abstract]
As Reported on the Consolidated Balance Sheet	18,626,000			18,626,000			20,191,000
Maximum Exposure	18,626,000			18,626,000			20,191,000
Appalachian Power Co [Member] | Current Assets [Member] | Appalachian Consumer Rate Relief Funding [Member]
ASSETS
Assets	23,121,000			23,121,000			5,891,000
Appalachian Power Co [Member] | Other Non Current Assets [Member] | Appalachian Consumer Rate Relief Funding [Member]
ASSETS
Assets	369,014,000	[3]		369,014,000	[3]		378,029,000	[3]
Appalachian Power Co [Member] | Total Assets [Member] | Appalachian Consumer Rate Relief Funding [Member]
ASSETS
Assets	392,135,000			392,135,000			383,920,000
Appalachian Power Co [Member] | Current Liabilities [Member] | Appalachian Consumer Rate Relief Funding [Member]
LIABILITIES AND EQUITY
Liabilities and Equity	30,327,000			30,327,000			14,000,000
Appalachian Power Co [Member] | Noncurrent Liabilities [Member] | Appalachian Consumer Rate Relief Funding [Member]
LIABILITIES AND EQUITY
Liabilities and Equity	359,907,000			359,907,000			368,018,000
Appalachian Power Co [Member] | Equity [Member] | Appalachian Consumer Rate Relief Funding [Member]
LIABILITIES AND EQUITY
Liabilities and Equity	1,901,000			1,901,000			1,902,000
Appalachian Power Co [Member] | Total Liabilities And Equity [Member] | Appalachian Consumer Rate Relief Funding [Member]
LIABILITIES AND EQUITY
Liabilities and Equity	392,135,000			392,135,000			383,920,000
Indiana Michigan Power Co [Member] | DCC Fuel [Member]
Variable Interest Entities (Textuals) [Abstract]
Payments Made by I&M to DCC Fuel	32,000,000		38,000,000	56,000,000		64,000,000
Indiana Michigan Power Co [Member] | Billings from AEP Generating Co [Member]
Billings from Affiliates
Billings from VIE	65,190,000		53,191,000	135,612,000		111,726,000
Variable Interest Entities (Textuals) [Abstract]
Billings from VIE	65,190,000		53,191,000	135,612,000		111,726,000
Indiana Michigan Power Co [Member] | Billings from American Electric Power Service Corporation [Member]
Billings from Affiliates
Billings from VIE	30,103,000		28,706,000	62,073,000		56,204,000
Variable Interest Entities (Textuals) [Abstract]
Billings from VIE	30,103,000		28,706,000	62,073,000		56,204,000
Indiana Michigan Power Co [Member] | Carrying Amount in AEPSC's Accounts Payable [Member]
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures [Abstract]
As Reported on the Consolidated Balance Sheet	10,361,000			10,361,000			12,864,000
Maximum Exposure	10,361,000			10,361,000			12,864,000
Indiana Michigan Power Co [Member] | Carrying Amount in AEGCo's Accounts Payable [Member]
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures [Abstract]
As Reported on the Consolidated Balance Sheet	23,801,000			23,801,000			23,916,000
Maximum Exposure	23,801,000			23,801,000			23,916,000
Indiana Michigan Power Co [Member] | Current Assets [Member] | DCC Fuel [Member]
ASSETS
Assets	88,084,000			88,084,000			117,762,000
Indiana Michigan Power Co [Member] | Net Property Plant And Equipment [Member] | DCC Fuel [Member]
ASSETS
Assets	96,821,000			96,821,000			156,820,000
Indiana Michigan Power Co [Member] | Other Non Current Assets [Member] | DCC Fuel [Member]
ASSETS
Assets	34,856,000			34,856,000			60,450,000
Indiana Michigan Power Co [Member] | Total Assets [Member] | DCC Fuel [Member]
ASSETS
Assets	219,761,000			219,761,000			335,032,000
Indiana Michigan Power Co [Member] | Current Liabilities [Member] | DCC Fuel [Member]
LIABILITIES AND EQUITY
Liabilities and Equity	84,086,000			84,086,000			107,815,000
Indiana Michigan Power Co [Member] | Noncurrent Liabilities [Member] | DCC Fuel [Member]
LIABILITIES AND EQUITY
Liabilities and Equity	135,675,000			135,675,000			227,217,000
Indiana Michigan Power Co [Member] | Total Liabilities And Equity [Member] | DCC Fuel [Member]
LIABILITIES AND EQUITY
Liabilities and Equity	219,761,000			219,761,000			335,032,000
Public Service Co Of Oklahoma [Member] | Billings from American Electric Power Service Corporation [Member]
Billings from Affiliates
Billings from VIE	22,889,000		19,807,000	47,329,000		37,969,000
Variable Interest Entities (Textuals) [Abstract]
Billings from VIE	22,889,000		19,807,000	47,329,000		37,969,000
Public Service Co Of Oklahoma [Member] | Carrying Amount in AEPSC's Accounts Payable [Member]
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures [Abstract]
As Reported on the Consolidated Balance Sheet	7,845,000			7,845,000			10,596,000
Maximum Exposure	7,845,000			7,845,000			10,596,000
Southwestern Electric Power Co [Member] | Sabine Mining Co [Member]
Billings from Affiliates
Billings from VIE	41,000,000		40,000,000	80,000,000		84,000,000
Variable Interest Entities (Textuals) [Abstract]
Billings from VIE	41,000,000		40,000,000	80,000,000		84,000,000
Southwestern Electric Power Co [Member] | Dolet Hills Lignite Co, LLC [Member]
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures [Abstract]
As Reported on the Consolidated Balance Sheet	9,969,000			9,969,000			9,243,000
Maximum Exposure	125,798,000			125,798,000			70,591,000
Billings from Affiliates
Billings from VIE	6,000,000		13,000,000	8,000,000		31,000,000
Variable Interest Entities (Textuals) [Abstract]
Billings from VIE	6,000,000		13,000,000	8,000,000		31,000,000
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] | Billings from American Electric Power Service Corporation [Member]
Billings from Affiliates
Billings from VIE	32,718,000		29,595,000	65,741,000		57,075,000
Variable Interest Entities (Textuals) [Abstract]
Billings from VIE	32,718,000		29,595,000	65,741,000		57,075,000
Southwestern Electric Power Co [Member] | Carrying Amount in AEPSC's Accounts Payable [Member]
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures [Abstract]
As Reported on the Consolidated Balance Sheet	9,758,000			9,758,000			13,520,000
Maximum Exposure	9,758,000			9,758,000			13,520,000
Southwestern Electric Power Co [Member] | Capital Contribution From Parent [Member] | Dolet Hills Lignite Co, LLC [Member]
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures [Abstract]
As Reported on the Consolidated Balance Sheet	7,643,000			7,643,000			7,643,000
Maximum Exposure	7,643,000			7,643,000			7,643,000
Southwestern Electric Power Co [Member] | Retained Earnings [Member] | Dolet Hills Lignite Co, LLC [Member]
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures [Abstract]
As Reported on the Consolidated Balance Sheet	2,326,000			2,326,000			1,600,000
Maximum Exposure	2,326,000			2,326,000			1,600,000
Southwestern Electric Power Co [Member] | SWEPCo's Guarantee Of Debt [Member] | Dolet Hills Lignite Co, LLC [Member]
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures [Abstract]
As Reported on the Consolidated Balance Sheet	0			0			0
Maximum Exposure	115,829,000			115,829,000			61,348,000
Southwestern Electric Power Co [Member] | Current Assets [Member] | Sabine Mining Co [Member]
ASSETS
Assets	59,604,000			59,604,000			66,478,000
Southwestern Electric Power Co [Member] | Net Property Plant And Equipment [Member] | Sabine Mining Co [Member]
ASSETS
Assets	152,818,000			152,818,000			157,274,000
Southwestern Electric Power Co [Member] | Other Non Current Assets [Member] | Sabine Mining Co [Member]
ASSETS
Assets	50,619,000			50,619,000			51,211,000
Southwestern Electric Power Co [Member] | Total Assets [Member] | Sabine Mining Co [Member]
ASSETS
Assets	263,041,000			263,041,000			274,963,000
Southwestern Electric Power Co [Member] | Current Liabilities [Member] | Sabine Mining Co [Member]
LIABILITIES AND EQUITY
Liabilities and Equity	28,892,000			28,892,000			32,812,000
Southwestern Electric Power Co [Member] | Noncurrent Liabilities [Member] | Sabine Mining Co [Member]
LIABILITIES AND EQUITY
Liabilities and Equity	233,752,000			233,752,000			241,673,000
Southwestern Electric Power Co [Member] | Equity [Member] | Sabine Mining Co [Member]
LIABILITIES AND EQUITY
Liabilities and Equity	397,000			397,000			478,000
Southwestern Electric Power Co [Member] | Total Liabilities And Equity [Member] | Sabine Mining Co [Member]
LIABILITIES AND EQUITY
Liabilities and Equity	263,041,000			263,041,000			274,963,000
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%			50.00%
AEP Generating Co [Member] | Rockport Generating Plant (Unit No. 2) [Member]
Variable Interest Entities (Textuals) [Abstract]
Percentage Interest in Rockport Plant Unit 2 Lease	50.00%			50.00%
AEP Generating Co [Member] | Lawrenceburg Generating Station [Member]
Variable Interest Entities (Textuals) [Abstract]
Jointly Owned Utility Plant, Proportionate Ownership Share	100.00%			100.00%
Cleco Power, LLC [Member]
Variable Interest Entities (Textuals) [Abstract]
Percentage of VIE Sales of Lignite Produced				50.00%
First Energy Corp [Member] | Allegheny Series [Member]
Variable Interest Entities (Textuals) [Abstract]
Percentage Ownership of "Allegheny Series" by a Nonaffiliated Company				100.00%
Ohio Power Co [Member]
Variable Interest Entities (Textuals) [Abstract]
Securitized Transition Assets	121,613,000			121,613,000			131,582,000
Ohio Power Co [Member] | Billings from AEP Generating Co [Member]
Billings from Affiliates
Billings from VIE	0		31,910,000	0		70,621,000
Variable Interest Entities (Textuals) [Abstract]
Billings from VIE	0		31,910,000	0		70,621,000
Ohio Power Co [Member] | Billings from American Electric Power Service Corporation [Member]
Billings from Affiliates
Billings from VIE	40,441,000		57,351,000	79,490,000		111,420,000
Variable Interest Entities (Textuals) [Abstract]
Billings from VIE	40,441,000		57,351,000	79,490,000		111,420,000
Ohio Power Co [Member] | Carrying Amount in AEPSC's Accounts Payable [Member]
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures [Abstract]
As Reported on the Consolidated Balance Sheet	14,116,000			14,116,000			31,425,000
Maximum Exposure	14,116,000			14,116,000			31,425,000
Ohio Power Co [Member] | Carrying Amount in AEGCo's Accounts Payable [Member]
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures [Abstract]
As Reported on the Consolidated Balance Sheet	0			0			12,810,000
Maximum Exposure	0			0			12,810,000
Ohio Power Co [Member] | Ohio Phase-In-Recovery Funding [Member]
Variable Interest Entities (Textuals) [Abstract]
Securitization Bonds	267,000,000			267,000,000			267,000,000
Securitized Transition Assets	122,000,000			122,000,000			132,000,000
Ohio Power Co [Member] | Current Assets [Member] | Ohio Phase-In-Recovery Funding [Member]
ASSETS
Assets	47,511,000			47,511,000			23,198,000
Ohio Power Co [Member] | Other Non Current Assets [Member] | Ohio Phase-In-Recovery Funding [Member]
ASSETS
Assets	232,219,000	[4]		232,219,000	[4]		251,409,000	[4]
Variable Interest Entities (Textuals) [Abstract]
Intercompany Item Eliminated in Consolidation	108,000,000			108,000,000			116,000,000
Ohio Power Co [Member] | Total Assets [Member] | Ohio Phase-In-Recovery Funding [Member]
ASSETS
Assets	279,730,000			279,730,000			274,607,000
Ohio Power Co [Member] | Current Liabilities [Member] | Ohio Phase-In-Recovery Funding [Member]
LIABILITIES AND EQUITY
Liabilities and Equity	60,510,000			60,510,000			36,470,000
Ohio Power Co [Member] | Noncurrent Liabilities [Member] | Ohio Phase-In-Recovery Funding [Member]
LIABILITIES AND EQUITY
Liabilities and Equity	217,883,000			217,883,000			236,800,000
Ohio Power Co [Member] | Equity [Member] | Ohio Phase-In-Recovery Funding [Member]
LIABILITIES AND EQUITY
Liabilities and Equity	1,337,000			1,337,000			1,337,000
Ohio Power Co [Member] | Total Liabilities And Equity [Member] | Ohio Phase-In-Recovery Funding [Member]
LIABILITIES AND EQUITY
Liabilities and Equity	$ 279,730,000			$ 279,730,000			$ 274,607,000

[1] Includes an intercompany item eliminated in consolidation of $79 million

[2] Includes an intercompany item eliminated in consolidation of $82 million

[3] Includes an intercompany item eliminated in consolidation as of June 30, 2014 and December 31, 2013 of $4 million and $4 million, respectively.

[4] Includes an intercompany item eliminated in consolidation as of June 30, 2014 and December 31, 2013 of $108 million and $116 million, respectively.