Business Segments (Tables)

3 Months Ended

Mar. 31, 2017

Segment Reporting [Abstract]

Reportable Segment Information

	Vertically Integrated Utilities		Transmission and Distribution Utilities		AEP Transmission Holdco		Generation & Marketing		Corporate and Other (a)			Reconciling Adjustments			Consolidated
	(in millions)
Three Months Ended   March 31, 2017
Revenues from:
External Customers	$	2,269.8	$	1,066.4	$	27.7	$	558.8	$	10.6		$	—		$	3,933.3
Other Operating Segments	20.6		20.0		128.4		32.6		15.9			(217.5		)	—
Total Revenues	$	2,290.4	$	1,086.4	$	156.1	$	591.4	$	26.5		$	(217.5	)	$	3,933.3
Net Income (Loss)	$	220.5	$	119.1	$	72.8	$	186.2	$	(4.4	)	$	—		$	594.2
	Vertically Integrated Utilities		Transmission and Distribution Utilities		AEP Transmission Holdco		Generation & Marketing		Corporate and Other (a)			Reconciling Adjustments			Consolidated
	(in millions)
Three Months Ended   March 31, 2016
Revenues from:
External Customers	$	2,218.1	$	1,077.3	$	29.3	$	713.9	$	6.3		$	—		$	4,044.9
Other Operating Segments	27.5		19.5		59.3		34.1		18.1			(158.5		)	—
Total Revenues	$	2,245.6	$	1,096.8	$	88.6	$	748.0	$	24.4		$	(158.5	)	$	4,044.9
Net Income	$	278.7	$	107.5	$	44.7	$	70.7	$	1.5		$	—		$	503.1

	Vertically Integrated Utilities		Transmission and Distribution Utilities		AEP Transmission Holdco		Generation & Marketing		Corporate and Other (a)		Reconciling Adjustments				Consolidated
	(in millions)
March 31, 2017
Total Property, Plant and Equipment	$	41,780.5	$	14,990.4	$	5,665.4	$	483.7	$	357.2	$	(366.7	)	(b)	$	62,910.5
Accumulated Depreciation and Amortization	12,712.9		3,697.8		120.7		140.4		188.7		(186.3		)	(b)	16,674.2
Total Property Plant and Equipment - Net	$	29,067.6	$	11,292.6	$	5,544.7	$	343.3	$	168.5	$	(180.4	)	(b)	$	46,236.3
Assets Held for Sale	$	—	$	—	$	—	$	9.7	$	—	$	—			$	9.7
Total Assets	$	37,562.2	$	14,813.5	$	6,721.4	$	2,194.9	$	21,233.1	$	(20,796.8	)	(b) (c)	$	61,728.3
Long-term Debt Due Within One Year:
Non-Affiliated	$	1,518.9	$	316.4	$	130.7	$	0.1	$	548.1	$	—			$	2,514.2
Long-term Debt:
Affiliated	40.0		—		—		32.2		—		(72.2		)		—
Non-Affiliated	9,938.9		4,554.4		1,931.4		—		297.5		—				16,722.2
Total Long-term Debt	$	11,497.8	$	4,870.8	$	2,062.1	$	32.3	$	845.6	$	(72.2	)		$	19,236.4
Liabilities Held for Sale	$	—	$	—	$	—	$	3.5	$	—	$	—			$	3.5
	Vertically Integrated Utilities		Transmission and Distribution Utilities		AEP Transmission Holdco		Generation & Marketing		Corporate and Other (a)		Reconciling Adjustments				Consolidated
	(in millions)
December 31, 2016
Total Property, Plant and Equipment	$	41,552.6	$	14,762.2	$	5,354.0	$	364.7	$	356.6	$	(353.5	)	(b)	$	62,036.6
Accumulated Depreciation and Amortization	12,596.7		3,655.0		101.4		42.2		186.0		(184.0		)	(b)	16,397.3
Total Property Plant and Equipment - Net	$	28,955.9	$	11,107.2	$	5,252.6	$	322.5	$	170.6	$	(169.5	)	(b)	$	45,639.3
Assets Held for Sale	$	—	$	—	$	—	$	1,951.2	$	—	$	—			$	1,951.2
Total Assets	$	37,428.3	$	14,802.4	$	6,384.8	$	3,386.1	$	20,354.8	$	(18,888.7	)	(b) (c)	$	63,467.7
Long-term Debt Due Within One Year:
Non-Affiliated	$	1,519.9	$	309.4	$	—	$	500.1	$	548.6	$	—			$	2,878.0
Long-term Debt:
Affiliated	20.0		—		—		32.2		—		(52.2		)		—
Non-Affiliated	10,353.3		4,672.2		2,055.7		—		297.2		—				17,378.4
Total Long-term Debt	$	11,893.2	$	4,981.6	$	2,055.7	$	532.3	$	845.8	$	(52.2	)		$	20,256.4
Liabilities Held for Sale	$	—	$	—	$	—	$	235.9	$	—	$	—			$	235.9

(a) Corporate and Other primarily includes the purchasing of receivables from certain AEP utility subsidiaries, Parent’s guarantee revenue received from affiliates, investment income, interest income and interest expense and other nonallocated costs.

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

(c) 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.