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Organization and Summary of Significant Accounting Policies (Tables)
 12 Months Ended
Dec. 31, 2017
Reconciliation of Cash, Cash Equivalents and Restricted Cash [Table Text Block]
 
 
December 31, 2017
 
 
AEP
 
AEP Texas
 
APCo
 
OPCo
 
 
(in millions)
Cash and Cash Equivalents
 
$
214.6

 
$
2.0

 
$
2.9

 
$
3.1

Restricted Cash
 
198.0

 
155.2

 
16.3

 
26.6

Total Cash, Cash Equivalents and Restricted Cash
 
$
412.6

 
$
157.2

 
$
19.2

 
$
29.7

 
 
December 31, 2016
 
 
AEP
 
AEP Texas
 
APCo
 
OPCo
 
 
(in millions)
Cash and Cash Equivalents
 
$
210.5

 
$
0.6

 
$
2.7

 
$
3.1

Restricted Cash
 
193.0

 
146.3

 
15.8

 
27.2

Total Cash, Cash Equivalents and Restricted Cash
 
$
403.5

 
$
146.9

 
$
18.5

 
$
30.3
Significant Customers
Significant Customers of AEP Texas:
 
 
 
 
 
 
Centrica, Just Energy and Reliant Energy
 
2017 (a)
 
2016
 
2015
Percentage of Total Revenues
 
35
%
 
46
%
 
53
%
Percentage of Accounts Receivable – Customers
 
31
%
 
42
%
 
43
%

(a)
Just Energy did not meet the Total Revenue threshold of 10% in order to be considered a significant customer.

Significant Customers of AEPTCo:
 
 
 
 
 
 
AEP Subsidiaries
 
2017
 
2016
 
2015
Percentage of Total Revenues
 
80
%
 
77
%
 
73
%
Percentage of Total Accounts Receivable
 
82
%
 
86
%
 
77
%
Target Asset Allocations
Pension Plan Assets
 
Target
Equity
 
25
%
Fixed Income
 
59
%
Other Investments
 
15
%
Cash and Cash Equivalents
 
1
%
 
 
 
OPEB Plans Assets
 
Target
Equity
 
49
%
Fixed Income
 
49
%
Cash and Cash Equivalents
 
2
%
Basic and Diluted EPS Calculations
 
 
Years Ended December 31,
 
 
2017
 
2016
 
2015
 
 
(in millions, except per share data)
 
 
 
 
$/share
 
 
 
$/share
 
 
 
$/share
Income from Continuing Operations
 
$
1,928.9

 
 
 
$
620.5

 
 
 
$
1,768.6

 
 
Less: Net Income Attributable to Noncontrolling Interests
 
16.3

 
 
 
7.1

 
 
 
5.2

 
 
Earnings Attributable to AEP Common Shareholders from Continuing Operations
 
$
1,912.6

 
 
 
$
613.4

 
 
 
$
1,763.4

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Weighted Average Number of Basic Shares Outstanding
 
491.8

 
$
3.89

 
491.5

 
$
1.25

 
490.3

 
$
3.59

Weighted Average Dilutive Effect of Stock-Based Awards
 
0.8

 
(0.01
)
 
0.2

 
—

 
0.3

 
—

Weighted Average Number of Diluted Shares Outstanding
 
492.6

 
$
3.88

 
491.7

 
$
1.25

 
490.6

 
$
3.59
Supplementary Information
 
 
Years Ended December 31,
Cash Flow Information
 
2017
 
2016
 
2015
 
 
(in millions)
Cash Paid (Received) for:
 
 
 
 
 
 
Interest, Net of Capitalized Amounts
 
$
858.3

 
$
848.5

 
$
857.2

Income Taxes
 
(1.1
)
 
29.5

 
120.2

Noncash Investing and Financing Activities:
 
 
 
 
 
 
Acquisitions Under Capital Leases
 
60.7

 
86.1

 
150.2

Construction Expenditures Included in Current Liabilities as of December 31,
 
1,330.8

 
858.0

 
741.4

Construction Expenditures Included in Noncurrent Liabilities as of December 31,
 
71.8

 
—

 
51.6

Construction Expenditures Included in Noncurrent Assets as of December 31,
 
—

 
—

 
10.5

Acquisition of Nuclear Fuel Included in Current Liabilities as of December 31,
 
—

 
2.1

 
37.9

Expected Reimbursement for Spent Nuclear Fuel Dry Cask Storage
 
2.6

 
0.7

 
2.2

2017
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Depreciation and Amortization
 
AEP
 
AEP Texas
 
AEPTCo
 
APCo
 
I&M
 
OPCo
 
PSO
 
SWEPCo
 
 
(in millions)
Depreciation and Amortization of Property, Plant and Equipment
 
$
1,709.1

 
$
221.1

 
$
97.1

 
$
407.6

 
$
203.1

 
$
200.9

 
$
131.4

 
$
217.2

Amortization of Certain Securitized Assets
 
275.9

 
231.4

 
—

 
—

 
—

 
44.4

 
—

 
—

Amortization of Regulatory Assets and Liabilities
 
12.2

 
(2.4
)
 
—

 
0.3

 
7.8

 
(19.4
)
 
(1.0
)
 
0.2

Total Depreciation and Amortization
 
$
1,997.2

 
$
450.1

 
$
97.1

 
$
407.9

 
$
210.9

 
$
225.9

 
$
130.4

 
$
217.4

2016
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Depreciation and Amortization
 
AEP
 
AEP Texas
 
AEPTCo
 
APCo
 
I&M
 
OPCo
 
PSO
 
SWEPCo
 
 
(in millions)
Depreciation and Amortization of Property, Plant and Equipment
 
$
1,688.5

 
$
204.0

 
$
65.9

 
$
387.6

 
$
183.9

 
$
202.3

 
$
122.6

 
$
196.6

Amortization of Certain Securitized Assets
 
254.6

 
210.3

 
—

 
—

 
—

 
44.3

 
—

 
—

Amortization of Regulatory Assets and Liabilities
 
19.2

 
(0.4
)
 
—

 
0.9

 
7.8

 
(8.0
)
 
7.6

 
(0.1
)
Total Depreciation and Amortization
 
$
1,962.3

 
$
413.9

 
$
65.9

 
$
388.5

 
$
191.7

 
$
238.6

 
$
130.2

 
$
196.5

2015
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Depreciation and Amortization
 
AEP
 
AEP Texas
 
AEPTCo
 
APCo
 
I&M
 
OPCo
 
PSO
 
SWEPCo
 
 
(in millions)
Depreciation and Amortization of Property, Plant and Equipment
 
$
1,674.3

 
$
193.3

 
$
42.4

 
$
385.6

 
$
193.5

 
$
184.4

 
$
108.6

 
$
190.7

Amortization of Certain Securitized Assets
 
318.9

 
275.5

 
—

 
—

 
—

 
43.3

 
—

 
—

Amortization of Regulatory Assets and Liabilities
 
16.5

 
0.1

 
—

 
3.2

 
4.9

 
(10.2
)
 
8.9

 
1.3

Total Depreciation and Amortization
 
$
2,009.7

 
$
468.9

 
$
42.4

 
$
388.8

 
$
198.4

 
$
217.5

 
$
117.5

 
$
192.0