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Business Segments (Tables)
 6 Months Ended
Jun. 30, 2017
Segment Reporting Information [Line Items]  
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
June 30, 2017
 

 
 

 
 

 
 

 
 

 
 
 
 

Revenues from:
 

 
 

 
 

 
 

 
 

 
 
 
 

External Customers
$
2,095.7

 
$
1,026.6

 
$
53.0

 
$
386.5

 
$
14.7

 
$
—

 
$
3,576.5

Other Operating Segments
24.8

 
26.9

 
194.3

 
24.1

 
14.2

 
(284.3
)
 
—

Total Revenues
$
2,120.5

 
$
1,053.5

 
$
247.3

 
$
410.6

 
$
28.9

 
$
(284.3
)
 
$
3,576.5

 
 
 
 
 
 
 
 
 
 
 
 
 
 
Income (Loss) from Continuing Operations
$
121.4

 
$
111.2

 
$
129.0

 
$
26.4

 
$
(11.8
)
 
$
—

 
$
376.2

Income from Discontinued Operations, Net of Tax
—

 
—

 
—

 
—

 
—

 
—

 
—

Net Income (Loss)
$
121.4

 
$
111.2

 
$
129.0

 
$
26.4

 
$
(11.8
)
 
$
—

 
$
376.2

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Vertically Integrated Utilities
 
Transmission and Distribution Utilities
 
AEP Transmission Holdco
 
Generation
&
Marketing
 
Corporate and Other (a)
 
Reconciling Adjustments
 
Consolidated
 
(in millions)
Three Months Ended
June 30, 2016
 

 
 

 
 

 
 

 
 

 
 
 
 

Revenues from:
 

 
 

 
 

 
 

 
 

 
 
 
 

External Customers
$
2,108.2

 
$
1,076.2

 
$
41.3

 
$
655.3

 
$
11.9

 
$
—

 
$
3,892.9

Other Operating Segments
17.7

 
19.9

 
120.4

 
28.5

 
18.0

 
(204.5
)
 
—

Total Revenues
$
2,125.9

 
$
1,096.1

 
$
161.7

 
$
683.8

 
$
29.9

 
$
(204.5
)
 
$
3,892.9

 
 
 
 
 
 
 
 
 
 
 
 
 
 
Income from Continuing Operations
$
210.5

 
$
124.6

 
$
95.3

 
$
49.7

 
$
26.3

 
$
—

 
$
506.4

Loss from Discontinued Operations, Net of Tax
—

 
—

 
—

 
—

 
(2.5
)
 
—

 
(2.5
)
Net Income
$
210.5

 
$
124.6

 
$
95.3

 
$
49.7

 
$
23.8

 
$
—

 
$
503.9


 
Vertically Integrated Utilities
 
Transmission and Distribution Utilities
 
AEP Transmission Holdco
 
Generation
&
Marketing
 
Corporate and Other (a)
 
Reconciling Adjustments
 
Consolidated
 
(in millions)
Six Months Ended
June 30, 2017
 

 
 

 
 

 
 

 
 

 
 
 
 

Revenues from:
 

 
 

 
 

 
 

 
 

 
 
 
 

External Customers
$
4,365.5

 
$
2,093.0

 
$
80.7

 
$
945.3

 
$
25.3

 
$
—

 
$
7,509.8

Other Operating Segments
45.4

 
46.9

 
322.7

 
56.7

 
30.1

 
(501.8
)
 
—

Total Revenues
$
4,410.9

 
$
2,139.9

 
$
403.4

 
$
1,002.0

 
$
55.4

 
$
(501.8
)
 
$
7,509.8

 
 
 
 
 
 
 
 
 
 
 
 
 
 
Income (Loss) from Continuing Operations
$
341.9

 
$
230.3

 
$
201.8

 
$
212.6

 
$
(16.2
)
 
$
—

 
$
970.4

Income from Discontinued Operations, Net of Tax
—

 
—

 
—

 
—

 
—

 
—

 
—

Net Income (Loss)
$
341.9

 
$
230.3

 
$
201.8

 
$
212.6

 
$
(16.2
)
 
$
—

 
$
970.4

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Vertically Integrated Utilities
 
Transmission and Distribution Utilities
 
AEP Transmission Holdco
 
Generation
&
Marketing
 
Corporate and Other (a)
 
Reconciling Adjustments
 
Consolidated
 
(in millions)
Six Months Ended
June 30, 2016
 

 
 

 
 

 
 

 
 

 
 
 
 

Revenues from:
 

 
 

 
 

 
 

 
 

 
 
 
 

External Customers
$
4,326.3

 
$
2,153.5

 
$
70.6

 
$
1,369.2

 
$
18.2

 
$
—

 
$
7,937.8

Other Operating Segments
45.2

 
39.4

 
179.7

 
62.6

 
36.1

 
(363.0
)
 
—

Total Revenues
$
4,371.5

 
$
2,192.9

 
$
250.3

 
$
1,431.8

 
$
54.3

 
$
(363.0
)
 
$
7,937.8

 
 
 
 
 
 
 
 
 
 
 
 
 
 
Income from Continuing Operations
$
489.2

 
$
232.1

 
$
140.0

 
$
120.4

 
$
27.8

 
$
—

 
$
1,009.5

Loss from Discontinued Operations, Net of Tax
—

 
—

 
—

 
—

 
(2.5
)
 
—

 
(2.5
)
Net Income
$
489.2

 
$
232.1

 
$
140.0

 
$
120.4

 
$
25.3

 
$
—

 
$
1,007.0

 
 
Vertically Integrated Utilities
 
Transmission and Distribution Utilities
 
AEP Transmission Holdco
 
Generation
&
Marketing
 
Corporate and Other (a)
 
Reconciling
Adjustments
 
Consolidated
 
 
(in millions)
June 30, 2017
 
 

 
 

 
 

 
 

 
 

 
 

 
 

Total Property, Plant and Equipment
 
$
42,313.2

 
$
15,292.0

 
$
6,012.1

 
$
518.4

 
$
365.6

 
$
(366.5
)
(b)
$
64,134.8

Accumulated Depreciation and Amortization
 
12,880.0

 
3,737.9

 
137.0

 
145.1

 
194.0

 
(186.4
)
(b)
16,907.6

Total Property Plant and Equipment - Net
 
$
29,433.2

 
$
11,554.1

 
$
5,875.1

 
$
373.3

 
$
171.6

 
$
(180.1
)
(b)
$
47,227.2

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Total Assets
 
$
37,914.1

 
$
15,092.4

 
$
7,024.9

 
$
1,905.7

 
$
21,147.9

 
$
(20,345.9
)
(b) (c)
$
62,739.1

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Long-term Debt Due Within One Year:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Non-Affiliated
 
$
1,449.6

 
$
756.9

 
$
—

 
$
—

 
$
548.5

 
$
—

 
$
2,755.0

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Long-term Debt:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Affiliated
 
40.0

 
—

 
—

 
32.2

 
—

 
(72.2
)
 
—

Non-Affiliated
 
10,347.5

 
4,088.0

 
2,063.5

 
—

 
297.9

 
—

 
16,796.9

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Total Long-term Debt
 
$
11,837.1

 
$
4,844.9

 
$
2,063.5

 
$
32.2

 
$
846.4

 
$
(72.2
)
 
$
19,551.9

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
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.
AEP Transmission Co [Member]  
Segment Reporting Information [Line Items]  
Reportable Segment Information
 
State Transcos
 
AEPTCo Parent
 
Reconciling Adjustments
 
AEPTCo
Consolidated
 
(in millions)
Three Months Ended June 30, 2017
 
 
 
 
 
 
 
Revenues from:
 
 
 
 
 
 
 
External Customers
$
44.0

 
$
—

 
$
—

 
$
44.0

Sales to AEP Affiliates
185.5

 
—

 
(0.1
)
 
185.4

Total Revenues
$
229.5

 
$
—

 
$
(0.1
)
 
$
229.4

 
 
 
 
 
 
 
 
Interest Income - Affiliated
$
—

 
$
19.4

 
$
(19.3
)
(a)
$
0.1

Interest Expense
15.9

 
19.1

 
(19.3
)
(a)
15.7

Income Tax Expense
55.7

 
0.1

 
—

 
55.8

Equity Earnings in State Transcos
—

 
107.4

 
(107.4
)
(b)
—

 
 
 
 
 
 
 
 
Net Income (Loss)
$
107.4

 
$
107.4

 
$
(107.4
)
(b)
$
107.4

 
State Transcos
 
AEPTCo Parent
 
Reconciling Adjustments
 
AEPTCo
Consolidated
 
(in millions)
Three Months Ended June 30, 2016
 
 
 
 
 
 
 
Revenues from:
 
 
 
 
 
 
 
External Customers
$
34.1

 
$
—

 
$
—

 
$
34.1

Sales to AEP Affiliates
119.0

 
—

 
—

 
119.0

Total Revenues
$
153.1

 
$
—

 
$
—

 
$
153.1

 
 
 
 
 
 
 
 
Interest Income - Affiliated
$
—

 
$
13.9

 
$
(13.8
)
(a)
$
0.1

Interest Expense
10.5

 
13.9

 
(13.9
)
(a)
10.5

Income Tax Expense
37.0

 
—

 
—

 
37.0

Equity Earnings in State Transcos
—

 
74.8

 
(74.8
)
(b)
—

 
 
 
 
 
 
 
 
Net Income (Loss)
$
74.8

 
$
74.8

 
$
(74.8
)
(b)
$
74.8

 
State Transcos
 
AEPTCo Parent
 
Reconciling Adjustments
 
AEPTCo
Consolidated
 
(in millions)
Six Months Ended June 30, 2017
 
 
 
 
 
 
 
Revenues from:
 
 
 
 
 
 
 
External Customers
$
63.3

 
$
—

 
$
—

 
$
63.3

Sales to AEP Affiliates
318.9

 
—

 
(0.1
)
 
318.8

Total Revenues
$
382.2

 
$
—

 
$
(0.1
)
 
$
382.1

 
 
 
 
 
 
 
 
Interest Income - Affiliated
$
0.1

 
$
38.5

 
$
(38.3
)
(a)
$
0.3

Interest Expense
31.7

 
38.3

 
(38.3
)
(a)
31.7

Income Tax Expense
84.1

 
0.2

 
—

 
84.3

Equity Earnings in State Transcos
—

 
164.2

 
(164.2
)
(b)
—

 
 
 
 
 
 
 
 
Net Income (Loss)
$
164.2

 
$
164.4

 
$
(164.2
)
(b)
$
164.4

 
State Transcos
 
AEPTCo Parent
 
Reconciling Adjustments
 
AEPTCo
Consolidated
 
(in millions)
Six Months Ended June 30, 2016
 
 
 
 
 
 
 
Revenues from:
 
 
 
 
 
 
 
External Customers
$
56.1

 
$
—

 
$
—

 
$
56.1

Sales to AEP Affiliates
176.6

 
—

 
—

 
176.6

Total Revenues
$
232.7

 
$
—

 
$
—

 
$
232.7

 
 
 
 
 
 
 
 
Interest Income - Affiliated
$
—

 
$
27.8

 
$
(27.7
)
(a)
$
0.1

Interest Expense
21.3

 
27.7

 
(27.7
)
(a)
21.3

Income Tax Expense
47.5

 
—

 
—

 
47.5

Equity Earnings in State Transcos
—

 
100.6

 
(100.6
)
(b)
—

 
 
 
 
 
 
 
 
Net Income (Loss)
$
100.6

 
$
100.6

 
$
(100.6
)
(b)
$
100.6

 
State Transcos
 
AEPTCo Parent
 
Reconciling Adjustments
 
AEPTCo
Consolidated
 
(in millions)
June 30, 2017
 
 
 
 
 
 
 
Total Transmission Property
$
5,690.3

 
$
—

 
$
—

 
$
5,690.3

Accumulated Depreciation and Amortization
133.1

 
—

 
—

 
133.1

Total Transmission Property – Net
$
5,557.2

 
$
—

 
$
—

 
$
5,557.2

 
 
 
 
 
 
 
 
Notes Receivable - Affiliated
$
—

 
$
1,950.0

 
$
(1,950.0
)
(c)
$
—

 
 
 
 
 
 
 
 
Total Assets
$
5,924.5

 
$
4,282.5

 
$
(4,263.4
)
(d)
$
5,943.6

 
 
 
 
 
 
 
 
Total Long-term Debt
$
1,931.4

 
$
1,950.0

 
$
(1,950.0
)
(c)
$
1,931.4

 
State Transcos
 
AEPTCo Parent
 
Reconciling Adjustments
 
AEPTCo
Consolidated
 
(in millions)
December 31, 2016
 
 
 
 
 
 
 
Total Transmission Property
$
5,054.2

 
$
—

 
$
—

 
$
5,054.2

Accumulated Depreciation and Amortization
99.6

 
—

 
—

 
99.6

Total Transmission Property – Net
$
4,954.6

 
$
—

 
$
—

 
$
4,954.6

 
 
 
 
 
 
 
 
Notes Receivable - Affiliated
$
—

 
$
1,950.0

 
$
(1,950.0
)
(c)
$
—

 
 
 
 
 
 
 
 
Total Assets
$
5,337.5

 
$
3,947.8

 
$
(3,935.5
)
(d)
$
5,349.8

 
 
 
 
 
 
 
 
Total Long-term Debt
$
1,932.0

 
$
1,950.0

 
$
(1,950.0
)
(c)
$
1,932.0


(a)
Elimination of intercompany interest income/interest expense on affiliated debt arrangement.
(b)
Elimination of AEPTCo Parent’s equity earnings in the State Transcos.
(c)
Elimination of intercompany debt.
(d)
Primarily relates to the elimination of AEPTCo Parent’s investment in the State Transcos and Notes Receivable from the State Transcos.