Business Segments (Tables)

6 Months Ended

Jun. 30, 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   June 30, 2015
Revenues from:
External Customers	$	2,159		$	1,008	$	25	$	628		$	115	$	7		$	—		(c)	$	3,942
Other Operating Segments	24			53		74		173			13		17			(354		)		—
Total Revenues	$	2,183		$	1,061	$	99	$	801		$	128	$	24		$	(354	)		$	3,942
Net Income (Loss)	$	208		$	78	$	65	$	82		$	1	$	(3	)	$	—			$	431
	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   June 30, 2014
Revenues from:
External Customers	$	2,236	(b)	$	1,064	$	21	$	573	(b)	$	140	$	10		$	—		(c)	$	4,044
Other Operating Segments	16		(b)	70		36		340		(b)	20		12			(494		)		—
Total Revenues	$	2,252		$	1,134	$	57	$	913		$	160	$	22		$	(494	)		$	4,044
Net Income (Loss)	$	155		$	90	$	47	$	98		$	3	$	(2	)	$	—			$	391

	Vertically Integrated Utilities			Transmission and Distribution Utilities		AEP Transmission Holdco		Generation & Marketing			AEP River Operations		Corporate and Other (a)			Reconciling Adjustments				Consolidated
	(in millions)
Six Months Ended   June 30, 2015
Revenues from:
External Customers	$	4,646		$	2,214	$	47	$	1,487		$	243	$	13		$	—		(c)	$	8,650
Other Operating Segments	42			117		110		484			24		37			(814		)		—
Total Revenues	$	4,688		$	2,331	$	157	$	1,971		$	267	$	50		$	(814	)		$	8,650
Net Income (Loss)	$	508		$	175	$	102	$	269		$	12	$	(4	)	$	—			$	1,062
	Vertically Integrated Utilities			Transmission and Distribution Utilities		AEP Transmission Holdco		Generation & Marketing			AEP River Operations		Corporate and Other (a)			Reconciling Adjustments				Consolidated
	(in millions)
Six Months Ended   June 30, 2014
Revenues from:
External Customers	$	4,785	(b)	$	2,225	$	33	$	1,394	(b)	$	286	$	20		$	(51	)	(c)	$	8,692
Other Operating Segments	53		(b)	124		52		770		(b)	39		28			(1,066		)		—
Total Revenues	$	4,838		$	2,349	$	85	$	2,164		$	325	$	48		$	(1,117	)		$	8,692
Net Income (Loss)	$	434		$	187	$	71	$	261		$	6	$	(7	)	$	—			$	952

	Vertically Integrated Utilities		Transmission and Distribution Utilities		AEP Transmission Holdco		Generation & Marketing		AEP River Operations		Corporate and Other (a)		Reconciling Adjustments				Consolidated
	(in millions)
June 30, 2015
Total Property, Plant and Equipment	$	39,561	$	13,506	$	3,275	$	7,456	$	726	$	357	$	(279	)	(d)	$	64,602
Accumulated Depreciation and Amortization	12,343		3,565		34		3,344		227		181		(105		)	(d)	19,589
Total Property Plant and Equipment - Net	$	27,218	$	9,941	$	3,241	$	4,112	$	499	$	176	$	(174	)	(d)	$	45,013
Total Assets	$	35,316	$	14,351	$	4,036	$	5,668	$	756	$	21,599	$	(20,788	)	(d) (e)	$	60,938
Long-term Debt Due Within One Year:
Affiliated	$	—	$	—	$	—	$	—	$	—	$	—	$	—			$	—
Non-Affiliated	894		678		—		240		3		2		—				1,817
Long-term Debt:
Affiliated	20		—		—		32		—		—		(52		)		—
Non-Affiliated	10,146		4,729		1,315		648		79		844		—				17,761
Total Long-term Debt	$	11,060	$	5,407	$	1,315	$	920	$	82	$	846	$	(52	)		$	19,578
	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.