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Business Segments (Tables)
 6 Months Ended
Jun. 30, 2018
Segment Reporting Information [Line Items]  
Reportable Segment Information
 
Three Months Ended June 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
$
2,340.7

 
$
1,127.9

 
$
103.5

 
$
435.3

 
$
5.8

 
$
—

 
$
4,013.2

Other Operating Segments
8.3

 
9.1

 
109.0

 
25.4

 
18.0

 
(169.8
)
 
—

Total Revenues
$
2,349.0

 
$
1,137.0

 
$
212.5

 
$
460.7

 
$
23.8

 
$
(169.8
)
 
$
4,013.2

 
 
 
 
 
 
 
 
 
 
 
 
 
 
Net Income (Loss)
$
277.9

 
$
114.0

 
$
101.9

 
$
38.6

 
$
(2.3
)
 
$
—

 
$
530.1

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Three Months Ended June 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
$
2,095.7

 
$
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

 
 
 
 
 
 
 
 
 
 
 
 
 
 
Net Income (Loss)
$
121.4

 
$
111.2

 
$
129.0

 
$
26.4

 
$
(11.8
)
 
$
—

 
$
376.2

 
Six Months Ended June 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
$
4,722.2

 
$
2,269.1

 
$
144.6

 
$
912.8

 
$
12.8

 
$
—

 
$
8,061.5

Other Operating Segments
34.8

 
30.3

 
273.4

 
53.0

 
35.0

 
(426.5
)
 
—

Total Revenues
$
4,757.0

 
$
2,299.4

 
$
418.0

 
$
965.8

 
$
47.8

 
$
(426.5
)
 
$
8,061.5

 
 
 
 
 
 
 
 
 
 
 
 
 
 
Net Income (Loss)
$
510.7

 
$
239.4

 
$
206.7

 
$
56.7

 
$
(26.7
)
 
$
—

 
$
986.8

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Six Months Ended June 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
$
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

 
 
 
 
 
 
 
 
 
 
 
 
 
 
Net Income (Loss)
$
341.9

 
$
230.3

 
$
201.8

 
$
212.6

 
$
(16.2
)
 
$
—

 
$
970.4


 
 
June 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
 
$
44,162.5

 
$
17,208.3

 
$
7,784.5

 
$
829.8

 
$
382.9

 
$
(355.1
)
(b)
$
70,012.9

Accumulated Depreciation and Amortization
 
13,495.0

 
3,830.9

 
219.0

 
28.2

 
185.2

 
(186.9
)
(b)
17,571.4

Total Property Plant and Equipment - Net
 
$
30,667.5

 
$
13,377.4

 
$
7,565.5

 
$
801.6

 
$
197.7

 
$
(168.2
)
(b)
$
52,441.5

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Total Assets
 
$
38,422.6

 
$
16,384.1

 
$
8,666.4

 
$
2,284.4

 
$
4,071.8

(c)
$
(2,959.2
)
(b) (d)
$
66,870.1

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Long-term Debt Due Within One Year:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Nonaffiliated
 
$
1,890.8

 
$
341.3

 
$
50.0

 
$
0.1

 
$
(0.8
)
 
$
—

 
$
2,281.4

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Long-term Debt:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Affiliated
 
50.0

 
—

 
—

 
32.2

 
—

 
(82.2
)
 
—

Nonaffiliated
 
10,455.9

 
5,390.2

 
2,640.5

 
(0.3
)
 
1,264.3

 
—

 
19,750.6

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Total Long-term Debt
 
$
12,396.7

 
$
5,731.5

 
$
2,690.5

 
$
32.0

 
$
1,263.5

 
$
(82.2
)
 
$
22,032.0

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
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 June 30, 2018
 
State Transcos
 
AEPTCo Parent
 
Reconciling Adjustments
 
AEPTCo
Consolidated
 
(in millions)
Revenues from:
 
 
 
 
 
 
 
External Customers
$
51.2

 
$
—

 
$
—

 
$
51.2

Sales to AEP Affiliates
132.6

 
—

 
—

 
132.6

Other Revenues
—

 
—

 
—

 
—

Total Revenues
$
183.8

 
$
—

 
$
—

 
$
183.8

 
 
 
 
 
 
 
 
Interest Income
$
—

 
$
25.2

 
$
(24.8
)
(a)
$
0.4

Interest Expense
20.3

 
24.8

 
(24.8
)
(a)
20.3

Income Tax Expense
19.4

 
0.6

 
—

 
20.0

 
 
 
 
 
 
 
 
Net Income
$
70.8

 
$
(0.3
)
(b)
$
—

 
$
70.5

 
Three Months Ended June 30, 2017
 
State Transcos
 
AEPTCo Parent
 
Reconciling Adjustments
 
AEPTCo
Consolidated
 
(in millions)
Revenues from:
 
 
 
 
 
 
 
External Customers
$
44.0

 
$
—

 
$
—

 
$
44.0

Sales to AEP Affiliates
185.5

 
—

 
(0.1
)
 
185.4

Other Revenues
—

 
—

 
—

 
—

Total Revenues
$
229.5

 
$
—

 
$
(0.1
)
 
$
229.4

 
 
 
 
 
 
 
 
Interest Income
$
—

 
$
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

 
 
 
 
 
 
 
 
Net Income
$
107.4

 
$
—

(b)
$
—

 
$
107.4

 
Six Months Ended June 30, 2018
 
State Transcos
 
AEPTCo Parent
 
Reconciling Adjustments
 
AEPTCo
Consolidated
 
(in millions)
Revenues from:
 
 
 
 
 
 
 
External Customers
$
82.5

 
$
—

 
$
—

 
$
82.5

Sales to AEP Affiliates
294.7

 
—

 
—

 
294.7

Other Revenues
0.1

 
$
—

 
$
—

 
0.1

Total Revenues
$
377.3

 
$
—

 
$
—

 
$
377.3

 
 
 
 
 
 
 
 
Interest Income
$
0.2

 
$
50.2

 
$
(49.6
)
(a)
$
0.8

Interest Expense
40.2

 
49.6

 
(49.6
)
(a)
40.2

Income Tax Expense
41.7

 
0.8

 
—

 
42.5

 
 
 
 
 
 
 
 
Net Income
$
156.8

 
$
(0.4
)
(b)
$
—

 
$
156.4

 
Six Months Ended June 30, 2017
 
State Transcos
 
AEPTCo Parent
 
Reconciling Adjustments
 
AEPTCo
Consolidated
 
(in millions)
Revenues from:
 
 
 
 
 
 
 
External Customers
$
63.2

 
$
—

 
$
—

 
$
63.2

Sales to AEP Affiliates
318.9

 
—

 
(0.1
)
 
318.8

Other Revenues
0.1

 
—

 
—

 
0.1

Total Revenues
$
382.2

 
$
—

 
$
(0.1
)
 
$
382.1

 
 
 
 
 
 
 
 
Interest Income
$
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

 
 
 
 
 
 
 
 
Net Income
$
164.2

 
$
0.2

(b)
$
—

 
$
164.4


 
June 30, 2018
 
State Transcos
 
AEPTCo Parent
 
Reconciling Adjustments
 
AEPTCo
Consolidated
 
(in millions)
Total Transmission Property
$
7,426.4

 
$
—

 
$
—

 
$
7,426.4

Accumulated Depreciation and Amortization
210.5

 
—

 
—

 
210.5

Total Transmission Property – Net
$
7,215.9

 
$
—

 
$
—

 
$
7,215.9

 
 
 
 
 
 
 
 
Notes Receivable - Affiliated
$
—

 
$
2,575.0

 
$
(2,575.0
)
(c)
$
—

 
 
 
 
 
 
 
 
Total Assets
$
7,533.4

 
$
2,623.4

(d)
$
(2,622.1
)
(e)
$
7,534.7

 
 
 
 
 
 
 
 
Total Long-term Debt
$
2,575.0

 
$
2,550.9

 
$
(2,575.0
)
(c)
$
2,550.9

 
December 31, 2017
 
State Transcos
 
AEPTCo Parent
 
Reconciling Adjustments
 
AEPTCo
Consolidated
 
(in millions)
Total Transmission Property
$
6,780.2

 
$
—

 
$
—

 
$
6,780.2

Accumulated Depreciation and Amortization
170.4

 
—

 
—

 
170.4

Total Transmission Property – Net
$
6,609.8

 
$
—

 
$
—

 
$
6,609.8

 
 
 
 
 
 
 
 
Notes Receivable - Affiliated
$
—

 
$
2,550.4

 
$
(2,550.4
)
(c)
$
—

 
 
 
 
 
 
 
 
Total Assets
$
7,072.9

 
$
2,590.1

(d)
$
(2,594.9
)
(e)
$
7,068.1

 
 
 
 
 
 
 
 
Total Long-term Debt
$
2,575.0

 
$
2,550.4

 
$
(2,575.0
)
(c)
$
2,550.4


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