Business Segments (Tables)

9 Months Ended

Sep. 30, 2018

Segment Reporting Information [Line Items]

Reportable Segment Information

	Three Months Ended September 30, 2018
	Vertically Integrated Utilities		Transmission and Distribution Utilities		AEP Transmission Holdco		Generation & Marketing		Corporate and Other (a)		Reconciling Adjustments			Consolidated
	(in millions)
Revenues from:
External Customers	$	2,610.2	$	1,180.9	$	51.9	$	486.5	$	3.6	$	—		$	4,333.1
Other Operating Segments	26.5		30.6		135.3		35.1		20.1		(247.6		)	—
Total Revenues	$	2,636.7	$	1,211.5	$	187.2	$	521.6	$	23.7	$	(247.6	)	$	4,333.1
Net Income (Loss)	$	345.6	$	145.2	$	74.2	$	5.1	$	9.6	$	—		$	579.7

	Three Months Ended September 30, 2017
	Vertically Integrated Utilities		Transmission and Distribution Utilities		AEP Transmission Holdco		Generation & Marketing		Corporate and Other (a)		Reconciling Adjustments			Consolidated
	(in millions)
Revenues from:
External Customers	$	2,453.8	$	1,149.7	$	45.1	$	441.5	$	14.6	$	—		$	4,104.7
Other Operating Segments	28.4		23.6		133.4		24.0		16.7		(226.1		)	—
Total Revenues	$	2,482.2	$	1,173.3	$	178.5	$	465.5	$	31.3	$	(226.1	)	$	4,104.7
Net Income (Loss)	$	297.3	$	144.0	$	76.5	$	33.7	$	5.2	$	—		$	556.7

	Nine Months Ended September 30, 2018
	Vertically Integrated Utilities		Transmission and Distribution Utilities		AEP Transmission Holdco		Generation & Marketing		Corporate and Other (a)			Reconciling Adjustments			Consolidated
	(in millions)
Revenues from:
External Customers	$	7,332.4	$	3,450.0	$	196.5	$	1,399.3	$	16.4		$	—		$	12,394.6
Other Operating Segments	61.3		60.9		408.7		88.1		55.1			(674.1		)	—
Total Revenues	$	7,393.7	$	3,510.9	$	605.2	$	1,487.4	$	71.5		$	(674.1	)	$	12,394.6
Net Income (Loss)	$	856.3	$	384.6	$	280.9	$	61.8	$	(17.1	)	$	—		$	1,566.5

	Nine Months Ended September 30, 2017
	Vertically Integrated Utilities		Transmission and Distribution Utilities		AEP Transmission Holdco		Generation & Marketing		Corporate and Other (a)			Reconciling Adjustments			Consolidated
	(in millions)
Revenues from:
External Customers	$	6,819.3	$	3,242.7	$	125.8	$	1,386.8	$	39.9		$	—		$	11,614.5
Other Operating Segments	73.8		70.5		456.1		80.7		46.8			(727.9		)	—
Total Revenues	$	6,893.1	$	3,313.2	$	581.9	$	1,467.5	$	86.7		$	(727.9	)	$	11,614.5
Net Income (Loss)	$	639.2	$	374.3	$	278.3	$	246.3	$	(11.0	)	$	—		$	1,527.1

	September 30, 2018
	Vertically Integrated Utilities		Transmission and Distribution Utilities		AEP Transmission Holdco		Generation & Marketing			Corporate and Other (a)				Reconciling Adjustments				Consolidated
	(in millions)
Total Property, Plant and Equipment	$	44,553.4	$	17,619.1	$	8,130.3	$	864.1		$	384.8			$	(354.4	)	(b)	$	71,197.3
Accumulated Depreciation and Amortization	13,703.3		3,856.7		244.3		40.1			183.6				(186.4		)	(b)	17,841.6
Total Property Plant and Equipment - Net	$	30,850.1	$	13,762.4	$	7,886.0	$	824.0		$	201.2			$	(168.0	)	(b)	$	53,355.7
Total Assets	$	38,813.2	$	16,399.1	$	9,127.7	$	2,369.3		$	4,306.1		(c)	$	(3,398.0	)	(b) (d)	$	67,617.4
Long-term Debt Due Within One Year:
Nonaffiliated	$	1,306.1	$	548.5	$	50.0	$	0.1		$	(0.5	)		$	—			$	1,904.2
Long-term Debt:
Affiliated	50.0		—		—		32.2			—				(82.2		)		—
Nonaffiliated	11,563.5		5,082.2		2,966.2		(0.3		)	1,258.2				—				20,869.8
Total Long-term Debt	$	12,919.6	$	5,630.7	$	3,016.2	$	32.0		$	1,257.7			$	(82.2	)		$	22,774.0

	December 31, 2017
	Vertically Integrated Utilities		Transmission and Distribution Utilities		AEP Transmission Holdco		Generation & Marketing			Corporate and Other (a)			Reconciling Adjustments				Consolidated
	(in millions)
Total Property, Plant and Equipment	$	43,294.4	$	16,371.2	$	7,110.2	$	644.6		$	374.5		$	(366.4	)	(b)	$	67,428.5
Accumulated Depreciation and Amortization	13,153.4		3,768.3		176.6		75.0			180.6			(186.9		)	(b)	17,167.0
Total Property Plant and Equipment - Net	$	30,141.0	$	12,602.9	$	6,933.6	$	569.6		$	193.9		$	(179.5	)	(b)	$	50,261.5
Total Assets	$	37,579.7	$	16,060.7	$	8,141.8	$	2,009.8		$	3,959.1	(c)	$	(3,022.0	)	(b) (d)	$	64,729.1
Long-term Debt Due Within One Year:
Nonaffiliated	$	1,038.1	$	663.1	$	50.0	$	—		$	2.5		$	—			$	1,753.7
Long-term Debt:
Affiliated	50.0		—		—		32.2			—			(82.2		)		—
Nonaffiliated	10,801.4		4,705.4		2,631.3		(0.3		)	1,281.8			—				19,419.6
Total Long-term Debt	$	11,889.5	$	5,368.5	$	2,681.3	$	31.9		$	1,284.3		$	(82.2	)		$	21,173.3

(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 eliminations due to an intercompany capital lease.

(c) Includes elimination of AEP Parent’s investments in wholly-owned subsidiary companies.

(d) Reconciling Adjustments for Total Assets primarily include elimination of intercompany advances to affiliates and intercompany accounts receivable.

	Three Months Ended September 30, 2018
	State Transcos		AEPTCo Parent				Reconciling Adjustments				AEPTCo Consolidated
	(in millions)
Revenues from:
External Customers	$	46.0	$	—			$	—			$	46.0
Sales to AEP Affiliates	148.4		—				—				148.4
Other Revenues	—		—				—				—
Total Revenues	$	194.4	$	—			$	—			$	194.4
Interest Income	$	0.2	$	26.0			$	(25.7	)	(b)	$	0.5
Interest Expense	19.8		25.7				(25.7		)	(b)	19.8
Income Tax Expense	18.4		(0.8		)		—				17.6
Net Income	$	77.1	$	1.0		(c)	$	—			$	78.1

	Three Months Ended September 30, 2017
	State Transcos (a)			AEPTCo Parent			Reconciling Adjustments				AEPTCo Consolidated (a)
	(in millions)
Revenues from:
External Customers	$	35.6		$	—		$	—			$	35.6
Sales to AEP Affiliates	130.1			—			—				130.1
Other Revenues	(0.1		)	—			—				(0.1		)
Total Revenues	$	165.6		$	—		$	—			$	165.6
Interest Income	$	—		$	19.5		$	(19.3	)	(b)	$	0.2
Interest Expense	17.1			19.3			(19.3		)	(b)	17.1
Income Tax Expense	29.5			—			—				29.5
Net Income	$	58.5		$	0.1	(c)	$	—			$	58.6

	Nine Months Ended September 30, 2018
	State Transcos (a)		AEPTCo Parent			Reconciling Adjustments				AEPTCo Consolidated (a)
	(in millions)
Revenues from:
External Customers	$	132.3	$	—		$	—			$	132.3
Sales to AEP Affiliates	453.8		—			—				453.8
Other Revenues	0.1		$	—		$	—			0.1
Total Revenues	$	586.2	$	—		$	—			$	586.2
Interest Income	$	0.4	$	76.2		$	(75.3	)	(b)	$	1.3
Interest Expense	60.7		75.3			(75.3		)	(b)	60.7
Income Tax Expense	63.7		—			—				63.7
Net Income	$	243.6	$	0.6	(c)	$	—			$	244.2

	Nine Months Ended September 30, 2017
	State Transcos (a)		AEPTCo Parent			Reconciling Adjustments				AEPTCo Consolidated (a)
	(in millions)
Revenues from:
External Customers	$	95.7	$	—		$	—			$	95.7
Sales to AEP Affiliates	439.1		—			—				439.1
Other Revenues	—		—			—				—
Total Revenues	$	534.8	$	—		$	—			$	534.8
Interest Income	$	0.1	$	58.0		$	(57.6	)	(b)	$	0.5
Interest Expense	50.4		57.6			(57.6		)	(b)	50.4
Income Tax Expense	108.0		0.2			—				108.2
Net Income	$	212.1	$	0.3	(c)	$	—			$	212.4

	September 30, 2018
	State Transcos			AEPTCo Parent			Reconciling Adjustments				AEPTCo Consolidated
	(in millions)
Total Transmission Property	$	7,761.6	(a)	$	—		$	—			$	7,761.6	(a)
Accumulated Depreciation and Amortization	234.6		(a)	—			—				234.6		(a)
Total Transmission Property – Net	$	7,527.0	(a)	$	—		$	—			$	7,527.0	(a)
Notes Receivable - Affiliated	$	—		$	2,900.0		$	(2,900.0	)	(d)	$	—
Total Assets	$	7,983.6	(a)	$	2,988.4	(e)	$	(2,973.6	)	(f)	$	7,998.4	(a)
Total Long-term Debt	$	2,900.0		$	2,872.6		$	(2,900.0	)	(d)	$	2,872.6

	December 31, 2017
	State Transcos			AEPTCo Parent			Reconciling Adjustments				AEPTCo Consolidated
	(in millions)
Total Transmission Property	$	6,770.5	(a)	$	—		$	—			$	6,770.5	(a)
Accumulated Depreciation and Amortization	152.6		(a)	—			—				152.6		(a)
Total Transmission Property – Net	$	6,617.9	(a)	$	—		$	—			$	6,617.9	(a)
Notes Receivable - Affiliated	$	—		$	2,550.4		$	(2,550.4	)	(d)	$	—
Total Assets	$	7,086.9	(a)	$	2,590.1	(e)	$	(2,594.9	)	(f)	$	7,082.1	(a)
Total Long-term Debt	$	2,575.0		$	2,550.4		$	(2,575.0	)	(d)	$	2,550.4

(a) The amounts presented reflect the revisions made to AEPTCo’s previously issued financial statements. For additional details on revisions made to AEPTCo’s financial statements, see Note 1- Significant Accounting Matters.

(b) Elimination of intercompany interest income/interest expense on affiliated debt arrangement.

(c) Includes the elimination of AEPTCo Parent’s equity earnings in the State Transcos.

(d) Elimination of intercompany debt.

(e) Includes the elimination of AEPTCo Parent’s investments in State Transcos.

(f) Primarily relates to the elimination of Notes Receivable from the State Transcos.