Business Segments (Tables)

3 Months Ended

Mar. 31, 2015

Segment Reporting [Abstract]

Reportable Segment Information

	Vertically Integrated Utilities			Transmission and Distribution Utilities		AEP Transmission Holdco		Generation & Marketing			AEP River Operations		Corporate and Other (a)			Reconciling Adjustments				Consolidated
	(in millions)
Three Months Ended   March 31, 2015
Revenues from:
External Customers	$	2,487		$	1,206	$	22	$	859		$	128	$	6		$	—			$	4,708
Other Operating Segments	18			64		36		311			11		20			(460		)		—
Total Revenues	$	2,505		$	1,270	$	58	$	1,170		$	139	$	26		$	(460	)		$	4,708
Net Income (Loss)	$	300		$	97	$	37	$	187		$	11	$	(1	)	$	—			$	631
	Vertically Integrated Utilities			Transmission and Distribution Utilities		AEP Transmission Holdco		Generation & Marketing			AEP River Operations		Corporate and Other (a)			Reconciling Adjustments				Consolidated
	(in millions)
Three Months Ended   March 31, 2014
Revenues from:
External Customers	$	2,549	(b)	$	1,161	$	12	$	821	(b)	$	146	$	10		$	(51	)	(c)	$	4,648
Other Operating Segments	37		(b)	54		16		430		(b)	19		16			(572		)		—
Total Revenues	$	2,586		$	1,215	$	28	$	1,251		$	165	$	26		$	(623	)		$	4,648
Net Income (Loss)	$	279		$	97	$	24	$	163		$	3	$	(5	)	$	—			$	561

	Vertically Integrated Utilities		Transmission and Distribution Utilities		AEP Transmission Holdco		Generation & Marketing		AEP River Operations		Corporate and Other (a)		Reconciling Adjustments				Consolidated
	(in millions)
March 31, 2015
Total Property, Plant and Equipment	$	40,890	$	13,251	$	2,980	$	7,414	$	701	$	350	$	(280	)	(d)	$	65,306
Accumulated Depreciation and Amortization	13,335		3,520		28		3,309		223		183		(102		)	(d)	20,496
Total Property Plant and Equipment - Net	$	27,555	$	9,731	$	2,952	$	4,105	$	478	$	167	$	(178	)	(d)	$	44,810
Total Assets	$	35,075	$	14,403	$	3,736	$	5,706	$	743	$	21,402	$	(21,027	)	(d) (e)	$	60,038
Long-term Debt Due Within One Year:
Affiliated	$	111	$	—	$	—	$	86	$	—	$	—	$	(197	)		$	—
Non-Affiliated	1,291		414		—		740		3		3		—				2,451
Long-term Debt:
Affiliated	20		—		—		32		—		—		(52		)		—
Non-Affiliated	9,393		5,105		1,207		148		80		845		—				16,778
Total Long-term Debt	$	10,815	$	5,519	$	1,207	$	1,006	$	83	$	848	$	(249	)		$	19,229
	Vertically Integrated Utilities		Transmission and Distribution Utilities		AEP Transmission Holdco		Generation & Marketing		AEP River Operations		Corporate and Other (a)		Reconciling Adjustments				Consolidated
	(in millions)
December 31, 2014
Total Property, Plant and Equipment	$	39,402	$	13,024	$	2,714	$	8,394	$	700	$	343	$	(272	)	(d)	$	64,305
Accumulated Depreciation and Amortization	12,773		3,481		25		3,603		217		188		(99		)	(d)	20,188
Total Property Plant and Equipment - Net	$	26,629	$	9,543	$	2,689	$	4,791	$	483	$	155	$	(173	)	(d)	$	44,117
Total Assets	$	33,750	$	14,495	$	3,575	$	6,329	$	749	$	21,081	$	(20,346	)	(d) (e)	$	59,633
Long-term Debt Due Within One Year:
Affiliated	$	111	$	—	$	—	$	86	$	—	$	—	$	(197	)		$	—
Non-Affiliated	1,352		405		—		740		3		3		—				2,503
Long-term Debt:
Affiliated	20		—		—		32		—		—		(52		)		—
Non-Affiliated	8,634		5,256		1,153		217		80		841		—				16,181
Total Long-term Debt	$	10,117	$	5,661	$	1,153	$	1,075	$	83	$	844	$	(249	)		$	18,684

(a) Corporate and Other primarily includes 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.

(b) Includes the impact of 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.

(c) Reconciling Adjustments for External Customers primarily include eliminations as a result of corporate separation in Ohio.

(d) Includes eliminations due to an intercompany capital lease.

(e) 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.