Business Segments (Details) (USD $)	3 Months Ended
	Mar. 31, 2014		Mar. 31, 2013		Dec. 31, 2013
Reportable Segment Information
Revenues	$ 4,648,000,000		$ 3,826,000,000
Net Income (Loss)	561,000,000		364,000,000
Balance Sheet Information
Total Property, Plant and Equipment	61,094,000,000				60,285,000,000
Accumulated Depreciation and Amortization	19,564,000,000				19,288,000,000
TOTAL PROPERTY, PLANT AND EQUIPMENT - NET	41,530,000,000				40,997,000,000
Total Assets	57,038,000,000				56,414,000,000
Reconciling Adjustments [Member]
Reportable Segment Information
Net Income (Loss)	0		0
Balance Sheet Information
Total Property, Plant and Equipment	(272,000,000)	[1]			(269,000,000)	[1]
Accumulated Depreciation and Amortization	(88,000,000)	[1]			(85,000,000)	[1]
TOTAL PROPERTY, PLANT AND EQUIPMENT - NET	(184,000,000)	[1]			(184,000,000)	[1]
Total Assets	(19,606,000,000)	[1],[2]			(19,531,000,000)	[1],[2]
Vertically Integrated Utilities [Member]
Reportable Segment Information
Sales Revenue, Net	2,549,000,000	[3]	2,356,000,000
Revenues	2,586,000,000		2,515,000,000
Net Income (Loss)	279,000,000		181,000,000
Balance Sheet Information
Total Property, Plant and Equipment	37,923,000,000				37,545,000,000
Accumulated Depreciation and Amortization	12,424,000,000				12,250,000,000
TOTAL PROPERTY, PLANT AND EQUIPMENT - NET	25,499,000,000				25,295,000,000
Total Assets	32,997,000,000				32,791,000,000
Vertically Integrated Utilities [Member] | Significant Reconciling Items [Member]
Reportable Segment Information
Sales Revenue, Net	37,000,000	[3]	159,000,000
Transmission And Distribution Utilities [Member]
Reportable Segment Information
Sales Revenue, Net	1,161,000,000		1,090,000,000
Revenues	1,215,000,000		1,134,000,000
Net Income (Loss)	97,000,000		87,000,000
Balance Sheet Information
Total Property, Plant and Equipment	12,339,000,000				12,143,000,000
Accumulated Depreciation and Amortization	3,382,000,000				3,342,000,000
TOTAL PROPERTY, PLANT AND EQUIPMENT - NET	8,957,000,000				8,801,000,000
Total Assets	13,899,000,000				14,165,000,000
Transmission And Distribution Utilities [Member] | Significant Reconciling Items [Member]
Reportable Segment Information
Sales Revenue, Net	54,000,000		44,000,000
AEP Transmission Holdco [Member]
Reportable Segment Information
Sales Revenue, Net	12,000,000		3,000,000
Revenues	28,000,000		8,000,000
Net Income (Loss)	24,000,000		12,000,000
Balance Sheet Information
Total Property, Plant and Equipment	1,842,000,000				1,636,000,000
Accumulated Depreciation and Amortization	13,000,000				10,000,000
TOTAL PROPERTY, PLANT AND EQUIPMENT - NET	1,829,000,000				1,626,000,000
Total Assets	2,460,000,000				2,245,000,000
AEP Transmission Holdco [Member] | Significant Reconciling Items [Member]
Reportable Segment Information
Sales Revenue, Net	16,000,000		5,000,000
AEP River Operations [Member]
Reportable Segment Information
Sales Revenue, Net	146,000,000		128,000,000
Revenues	165,000,000		133,000,000
Net Income (Loss)	3,000,000		(2,000,000)
Balance Sheet Information
Total Property, Plant and Equipment	639,000,000				638,000,000
Accumulated Depreciation and Amortization	197,000,000				189,000,000
TOTAL PROPERTY, PLANT AND EQUIPMENT - NET	442,000,000				449,000,000
Total Assets	659,000,000				673,000,000
AEP River Operations [Member] | Significant Reconciling Items [Member]
Reportable Segment Information
Sales Revenue, Net	19,000,000		5,000,000
Generation and Marketing [Member]
Reportable Segment Information
Sales Revenue, Net	821,000,000	[3]	258,000,000
Revenues	1,251,000,000		920,000,000
Net Income (Loss)	163,000,000		85,000,000
Balance Sheet Information
Total Property, Plant and Equipment	8,302,000,000				8,277,000,000
Accumulated Depreciation and Amortization	3,460,000,000				3,409,000,000
TOTAL PROPERTY, PLANT AND EQUIPMENT - NET	4,842,000,000				4,868,000,000
Total Assets	6,354,000,000				6,426,000,000
Generation and Marketing [Member] | Significant Reconciling Items [Member]
Reportable Segment Information
Sales Revenue, Net	430,000,000	[3]	662,000,000
All Other [Member]
Reportable Segment Information
Sales Revenue, Net	10,000,000	[4]	5,000,000	[4]
Revenues	26,000,000	[4]	18,000,000	[4]
Net Income (Loss)	(5,000,000)	[4]	1,000,000	[4]
Balance Sheet Information
Total Property, Plant and Equipment	321,000,000	[4]			315,000,000	[4]
Accumulated Depreciation and Amortization	176,000,000	[4]			173,000,000	[4]
TOTAL PROPERTY, PLANT AND EQUIPMENT - NET	145,000,000	[4]			142,000,000	[4]
Total Assets	20,275,000,000	[4]			19,645,000,000	[4]
All Other [Member] | Significant Reconciling Items [Member]
Reportable Segment Information
Sales Revenue, Net	16,000,000	[4]	13,000,000	[4]
Consolidation Eliminations [Member]
Reportable Segment Information
Sales Revenue, Net	(51,000,000)	[5]	(14,000,000)	[5]
Revenues	(623,000,000)		(902,000,000)
Consolidation Eliminations [Member] | Reconciling Adjustments [Member]
Reportable Segment Information
Sales Revenue, Net	$ (572,000,000)		$ (888,000,000)

[1] Includes eliminations due to an intercompany capital lease.

[2] Reconciling Adjustments for Total Assets primarily include the elimination of intercompany advances to affiliates and intercompany accounts receivable along with the elimination of AEP’s investments in subsidiary companies.

[3] Includes the impact of the corporate separation of OPCo’s generation assets and liabilities that took effect December 31, 2013, as well as the impact of the termination of the Interconnection Agreement effective January 1, 2014.

[4] Corporate and Other primarily includes management and professional services to AEP provided at cost to AEP subsidiaries and the purchasing of receivables from certain AEP utility subsidiaries. This segment also includes Parent’s guarantee revenue received from affiliates, investment income, interest income and interest expense and other nonallocated costs.

[5] Reconciling Adjustments for External Customers primarily include eliminations as a result of corporate separation.