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Comprehensive Income (Tables)
 12 Months Ended
Dec. 31, 2016
Changes in Accumulated Other Comprehensive Income (Loss) by Component
AEP
 
 
 
 
 
 
 
 
 
 
 
Changes in Accumulated Other Comprehensive Income (Loss) by Component
For the Year Ended December 31, 2016
 
 
 
 
 
 
 
 
 
 
 
 
 
Cash Flow Hedges
 
 
 
Pension and OPEB
 
 
 
Commodity
 
Interest Rate
 
Securities
Available for Sale
 
Amortization of Deferred Costs
 
Changes in Funded Status
 
Total
 
(in millions)
Balance in AOCI as of December 31, 2015
$
(5.2
)
 
$
(17.2
)
 
$
7.1

 
$
139.9

 
$
(251.7
)
 
$
(127.1
)
Change in Fair Value Recognized in AOCI
(14.6
)
 
—

 
1.3

 
—

 
(14.7
)
 
(28.0
)
Amount of (Gain) Loss Reclassified from AOCI
 
 
 
 
 
 
 
 
 
 
 
Generation & Marketing Revenues
(21.4
)
 
—

 
—

 
—

 
—

 
(21.4
)
Purchased Electricity for Resale
16.4

 
—

 
—

 
—

 
—

 
16.4

Interest Expense
—

 
2.4

 
—

 
—

 
—

 
2.4

Amortization of Prior Service Cost (Credit)
—

 
—

 
—

 
(19.4
)
 
—

 
(19.4
)
Amortization of Actuarial (Gains)/Losses
—

 
—

 
—

 
20.3

 
—

 
20.3

Reclassifications from AOCI, before Income Tax (Expense) Credit
(5.0
)
 
2.4

 
—

 
0.9

 
—

 
(1.7
)
Income Tax (Expense) Credit
(1.7
)
 
0.9

 
—

 
0.3

 
—

 
(0.5
)
Reclassifications from AOCI, Net of Income Tax (Expense) Credit
(3.3
)
 
1.5

 
—

 
0.6

 
—

 
(1.2
)
Net Current Period Other Comprehensive Income (Loss)
(17.9
)
 
1.5

 
1.3

 
0.6

 
(14.7
)
 
(29.2
)
Balance in AOCI as of December 31, 2016
$
(23.1
)
 
$
(15.7
)
 
$
8.4

 
$
140.5

 
$
(266.4
)
 
$
(156.3
)

AEP
 
 
 
 
 
 
 
 
 
 
 
Changes in Accumulated Other Comprehensive Income (Loss) by Component
For the Year Ended December 31, 2015
 
 
 
 
 
 
 
 
 
 
 
 
 
Cash Flow Hedges
 
 
 
Pension and OPEB
 
 
 
Commodity
 
Interest Rate
 
Securities
Available for Sale
 
Amortization of Deferred Costs
 
Changes in Funded Status
 
Total
 
(in millions)
Balance in AOCI as of December 31, 2014
$
1.6

 
$
(19.1
)
 
$
7.7

 
$
138.7

 
$
(232.0
)
 
$
(103.1
)
Change in Fair Value Recognized in AOCI
5.6

 
—

 
(0.6
)
 
—

 
(25.7
)
 
(20.7
)
Amount of (Gain) Loss Reclassified from AOCI
 
 
 
 
 
 
 
 
 
 
 
Generation & Marketing Revenues
(48.1
)
 
—

 
—

 
—

 
—

 
(48.1
)
Purchased Electricity for Resale
29.1

 
—

 
—

 
—

 
—

 
29.1

Interest Expense
—

 
2.9

 
—

 
—

 
—

 
2.9

Amortization of Prior Service Cost (Credit)
—

 
—

 
—

 
(19.5
)
 
—

 
(19.5
)
Amortization of Actuarial (Gains)/Losses
—

 
—

 
—

 
21.3

 
—

 
21.3

Reclassifications from AOCI, before Income Tax (Expense) Credit
(19.0
)
 
2.9

 
—

 
1.8

 
—

 
(14.3
)
Income Tax (Expense) Credit
(6.6
)
 
1.0

 
—

 
0.6

 
—

 
(5.0
)
Reclassifications from AOCI, Net of Income Tax (Expense) Credit
(12.4
)
 
1.9

 
—

 
1.2

 
—

 
(9.3
)
Net Current Period Other Comprehensive Income (Loss)
(6.8
)
 
1.9

 
(0.6
)
 
1.2

 
(25.7
)
 
(30.0
)
Balance in AOCI as of Pension and OPEB Adjustment Related to Mitchell Plant
—

 
—

 
—

 
—

 
6.0

 
6.0

Balance in AOCI as of December 31, 2015
$
(5.2
)
 
$
(17.2
)
 
$
7.1

 
$
139.9

 
$
(251.7
)
 
$
(127.1
)


AEP
 
 
 
 
 
 
 
 
 
 
 
Changes in Accumulated Other Comprehensive Income (Loss) by Component
For the Year Ended December 31, 2014
 
 
 
 
 
 
 
 
 
 
 
 
 
Cash Flow Hedges
 
 
 
Pension and OPEB
 
 
 
Commodity
 
Interest Rate
 
Securities
Available for Sale
 
Amortization of Deferred Costs
 
Changes in Funded Status
 
Total
 
(in millions)
Balance in AOCI as of December 31, 2013
$
0.2

 
$
(23.0
)
 
$
6.8

 
$
133.9

 
$
(233.1
)
 
$
(115.2
)
Change in Fair Value Recognized in AOCI
(9.8
)
 
—

 
0.9

 
—

 
1.1

 
(7.8
)
Amount of (Gain) Loss Reclassified from AOCI
 
 
 
 
 
 
 
 
 
 
 
Generation & Marketing Revenues
59.1

 
—

 
—

 
—

 
—

 
59.1

Purchased Electricity for Resale
(39.1
)
 
—

 
—

 
—

 
—

 
(39.1
)
Regulatory Assets/(Liabilities), Net (a)
(2.8
)
 
—

 
—

 
—

 
—

 
(2.8
)
Interest Expense
—

 
6.1

 
—

 
—

 
—

 
6.1

Amortization of Prior Service Cost (Credit)
—

 
—

 
—

 
(20.6
)
 
—

 
(20.6
)
Amortization of Actuarial (Gains)/Losses
—

 
—

 
—

 
28.0

 
—

 
28.0

Reclassifications from AOCI, before Income Tax (Expense) Credit
17.2

 
6.1

 
—

 
7.4

 
—

 
30.7

Income Tax (Expense) Credit
6.0

 
2.2

 
—

 
2.6

 
—

 
10.8

Reclassifications from AOCI, Net of Income Tax (Expense) Credit
11.2

 
3.9

 
—

 
4.8

 
—

 
19.9

Net Current Period Other Comprehensive Income
1.4

 
3.9

 
0.9

 
4.8

 
1.1

 
12.1

Balance in AOCI as of December 31, 2014
$
1.6

 
$
(19.1
)
 
$
7.7

 
$
138.7

 
$
(232.0
)
 
$
(103.1
)
(a)
Represents realized gains and losses subject to regulatory accounting treatment recorded as either current or noncurrent on the balance sheets.
Appalachian Power Co [Member]  
Changes in Accumulated Other Comprehensive Income (Loss) by Component
APCo
 
 
 
 
 
 
 
 
 
 
Changes in Accumulated Other Comprehensive Income (Loss) by Component
For the Year Ended December 31, 2016
 
 
 
 
 
 
 
 
 
 
 
 
 
Cash Flow Hedges
 
Pension and OPEB
 
 
 
 
Commodity
 
Interest Rate
 
Amortization of Deferred Costs
 
Changes in Funded Status
 
Total
 
 
(in millions)
Balance in AOCI as of December 31, 2015
 
$
—

 
$
3.6

 
$
17.4

 
$
(23.8
)
 
$
(2.8
)
Change in Fair Value Recognized in AOCI
 
—

 
—

 
—

 
(3.5
)
 
(3.5
)
Amount of (Gain) Loss Reclassified from AOCI
 
 
 
 
 
 
 
 
 
 
Interest Expense
 
—

 
(1.1
)
 
—

 
—

 
(1.1
)
Amortization of Prior Service Cost (Credit)
 
—

 
—

 
(5.1
)
 
—

 
(5.1
)
Amortization of Actuarial (Gains)/Losses
 
—

 
—

 
3.0

 
—

 
3.0

Reclassifications from AOCI, before Income Tax (Expense) Credit
 
—

 
(1.1
)
 
(2.1
)
 
—

 
(3.2
)
Income Tax (Expense) Credit
 
—

 
(0.4
)
 
(0.7
)
 
—

 
(1.1
)
Reclassifications from AOCI, Net of Income Tax (Expense) Credit
 
—

 
(0.7
)
 
(1.4
)
 
—

 
(2.1
)
Net Current Period Other Comprehensive Loss
 
—

 
(0.7
)
 
(1.4
)
 
(3.5
)
 
(5.6
)
Balance in AOCI as of December 31, 2016
 
$
—

 
$
2.9

 
$
16.0

 
$
(27.3
)
 
$
(8.4
)


APCo
 
 
 
 
 
 
 
 
 
 
Changes in Accumulated Other Comprehensive Income (Loss) by Component
For the Year Ended December 31, 2015
 
 
 
 
 
 
 
 
 
 
 
 
 
Cash Flow Hedges
 
Pension and OPEB
 
 
 
 
Commodity
 
Interest Rate
 
Amortization of Deferred Costs
 
Changes in Funded Status
 
Total
 
 
(in millions)
Balance in AOCI as of December 31, 2014
 
$
—

 
$
3.9

 
$
19.2

 
$
(18.1
)
 
$
5.0

Change in Fair Value Recognized in AOCI
 
—

 
—

 
—

 
(5.7
)
 
(5.7
)
Amount of (Gain) Loss Reclassified from AOCI
 
 
 
 
 
 
 
 
 
 
Interest Expense
 
—

 
(0.4
)
 
—

 
—

 
(0.4
)
Amortization of Prior Service Cost (Credit)
 
—

 
—

 
(5.1
)
 
—

 
(5.1
)
Amortization of Actuarial (Gains)/Losses
 
—

 
—

 
2.3

 
—

 
2.3

Reclassifications from AOCI, before Income Tax (Expense) Credit
 
—

 
(0.4
)
 
(2.8
)
 
—

 
(3.2
)
Income Tax (Expense) Credit
 
—

 
(0.1
)
 
(1.0
)
 
—

 
(1.1
)
Reclassifications from AOCI, Net of Income Tax (Expense) Credit
 
—

 
(0.3
)
 
(1.8
)
 
—

 
(2.1
)
Net Current Period Other Comprehensive Loss
 
—

 
(0.3
)
 
(1.8
)
 
(5.7
)
 
(7.8
)
Balance in AOCI as of December 31, 2015
 
$
—

 
$
3.6

 
$
17.4

 
$
(23.8
)
 
$
(2.8
)
APCo
 
 
 
 
 
 
 
 
 
 
Changes in Accumulated Other Comprehensive Income (Loss) by Component
For the Year Ended December 31, 2014
 
 
 
 
 
 
 
 
 
 
 
 
 
Cash Flow Hedges
 
Pension and OPEB
 
 
 
 
Commodity
 
Interest Rate
 
Amortization of Deferred Costs
 
Changes in Funded Status
 
Total
 
 
(in millions)
Balance in AOCI as of December 31, 2013
 
$
0.1

 
$
3.1

 
$
20.5

 
$
(20.8
)
 
$
2.9

Change in Fair Value Recognized in AOCI
 
1.7

 
—

 
—

 
2.7

 
4.4

Amount of (Gain) Loss Reclassified from AOCI
 
 
 
 
 
 
 
 
 
 
Purchased Electricity for Resale
 
(0.5
)
 
—

 
—

 
—

 
(0.5
)
Regulatory Assets/(Liabilities), Net (a)
 
(2.2
)
 
—

 
—

 
—

 
(2.2
)
Interest Expense
 
—

 
1.2

 
—

 
—

 
1.2

Amortization of Prior Service Cost (Credit)
 
—

 
—

 
(5.1
)
 
—

 
(5.1
)
Amortization of Actuarial (Gains)/Losses
 
—

 
—

 
3.1

 
—

 
3.1

Reclassifications from AOCI, before Income Tax (Expense) Credit
 
(2.7
)
 
1.2

 
(2.0
)
 
—

 
(3.5
)
Income Tax (Expense) Credit
 
(0.9
)
 
0.4

 
(0.7
)
 
—

 
(1.2
)
Reclassifications from AOCI, Net of Income Tax (Expense) Credit
 
(1.8
)
 
0.8

 
(1.3
)
 
—

 
(2.3
)
Net Current Period Other Comprehensive Income (Loss)
 
(0.1
)
 
0.8

 
(1.3
)
 
2.7

 
2.1

Balance in AOCI as of December 31, 2014
 
$
—

 
$
3.9

 
$
19.2

 
$
(18.1
)
 
$
5.0

(a)
Represents realized gains and losses subject to regulatory accounting treatment recorded as either current or noncurrent on the balance sheets.
Indiana Michigan Power Co [Member]  
Changes in Accumulated Other Comprehensive Income (Loss) by Component
(a)
Represents realized gains and losses subject to regulatory accounting treatment recorded as either current or noncurrent on the balance sheets.
I&M
 
 
 
 
 
 
 
 
 
 
Changes in Accumulated Other Comprehensive Income (Loss) by Component
For the Year Ended December 31, 2016
 
 
 
 
 
 
 
 
 
 
 
 
 
Cash Flow Hedges
 
Pension and OPEB
 
 
 
 
Commodity
 
Interest Rate
 
Amortization of Deferred Costs
 
Changes in Funded Status
 
Total
 
 
(in millions)
Balance in AOCI as of December 31, 2015
 
$
—

 
$
(13.3
)
 
$
5.1

 
$
(8.5
)
 
$
(16.7
)
Change in Fair Value Recognized in AOCI
 
—

 
—

 
—

 
(0.8
)
 
(0.8
)
Amount of (Gain) Loss Reclassified from AOCI
 
 
 
 
 
 
 
 
 
 
Interest Expense
 
—

 
2.0

 
—

 
—

 
2.0

Amortization of Prior Service Cost (Credit)
 
—

 
—

 
(0.8
)
 
—

 
(0.8
)
Amortization of Actuarial (Gains)/Losses
 
—

 
—

 
0.8

 
—

 
0.8

Reclassifications from AOCI, before Income Tax (Expense) Credit
 
—

 
2.0

 
—

 
—

 
2.0

Income Tax (Expense) Credit
 
—

 
0.7

 
—

 
—

 
0.7

Reclassifications from AOCI, Net of Income Tax (Expense) Credit
 
—

 
1.3

 
—

 
—

 
1.3

Net Current Period Other Comprehensive Income (Loss)
 
—

 
1.3

 
—

 
(0.8
)
 
0.5

Balance in AOCI as of December 31, 2016
 
$
—

 
$
(12.0
)
 
$
5.1

 
$
(9.3
)
 
$
(16.2
)
I&M
 
 
 
 
 
 
 
 
 
 
Changes in Accumulated Other Comprehensive Income (Loss) by Component
For the Year Ended December 31, 2015
 
 
 
 
 
 
 
 
 
 
 
 
 
Cash Flow Hedges
 
Pension and OPEB
 
 
 
 
Commodity
 
Interest Rate
 
Amortization of Deferred Costs
 
Changes in Funded Status
 
Total
 
 
(in millions)
Balance in AOCI as of December 31, 2014
 
$
—

 
$
(14.4
)
 
$
5.1

 
$
(5.0
)
 
$
(14.3
)
Change in Fair Value Recognized in AOCI
 
—

 
—

 
—

 
(3.5
)
 
(3.5
)
Amount of (Gain) Loss Reclassified from AOCI
 
 
 
 
 
 
 
 
 
 
Interest Expense
 
—

 
1.7

 
—

 
—

 
1.7

Amortization of Prior Service Cost (Credit)
 
—

 
—

 
(0.9
)
 
—

 
(0.9
)
Amortization of Actuarial (Gains)/Losses
 
—

 
—

 
0.9

 
—

 
0.9

Reclassifications from AOCI, before Income Tax (Expense) Credit
 
—

 
1.7

 
—

 
—

 
1.7

Income Tax (Expense) Credit
 
—

 
0.6

 
—

 
—

 
0.6

Reclassifications from AOCI, Net of Income Tax (Expense) Credit
 
—

 
1.1

 
—

 
—

 
1.1

Net Current Period Other Comprehensive Income (Loss)
 
—

 
1.1

 
—

 
(3.5
)
 
(2.4
)
Balance in AOCI as of December 31, 2015
 
$
—

 
$
(13.3
)
 
$
5.1

 
$
(8.5
)
 
$
(16.7
)

I&M
 
 
 
 
 
 
 
 
 
 
Changes in Accumulated Other Comprehensive Income (Loss) by Component
For the Year Ended December 31, 2014
 
 
 
 
 
 
 
 
 
 
 
 
 
Cash Flow Hedges
 
Pension and OPEB
 
 
 
 
Commodity
 
Interest Rate
 
Amortization of Deferred Costs
 
Changes in Funded Status
 
Total
 
 
(in millions)
Balance in AOCI as of December 31, 2013
 
$
0.1

 
$
(16.0
)
 
$
4.9

 
$
(4.5
)
 
$
(15.5
)
Change in Fair Value Recognized in AOCI
 
1.1

 
—

 
—

 
(0.5
)
 
0.6

Amount of (Gain) Loss Reclassified from AOCI
 
 
 
 
 
 
 
 
 
 
Purchased Electricity for Resale
 
(0.8
)
 
—

 
—

 
—

 
(0.8
)
Regulatory Assets/(Liabilities), Net (a)
 
(1.0
)
 
—

 
—

 
—

 
(1.0
)
Interest Expense
 
—

 
2.4

 
—

 
—

 
2.4

Amortization of Prior Service Cost (Credit)
 
—

 
—

 
(0.8
)
 
—

 
(0.8
)
Amortization of Actuarial (Gains)/Losses
 
—

 
—

 
1.1

 
—

 
1.1

Reclassifications from AOCI, before Income Tax (Expense) Credit
 
(1.8
)
 
2.4

 
0.3

 
—

 
0.9

Income Tax (Expense) Credit
 
(0.6
)
 
0.8

 
0.1

 
—

 
0.3

Reclassifications from AOCI, Net of Income Tax (Expense) Credit
 
(1.2
)
 
1.6

 
0.2

 
—

 
0.6

Net Current Period Other Comprehensive Income (Loss)
 
(0.1
)
 
1.6

 
0.2

 
(0.5
)
 
1.2

Balance in AOCI as of December 31, 2014
 
$
—

 
$
(14.4
)
 
$
5.1

 
$
(5.0
)
 
$
(14.3
)
Ohio Power Co [Member]  
Changes in Accumulated Other Comprehensive Income (Loss) by Component
(a)
Represents realized gains and losses subject to regulatory accounting treatment recorded as either current or noncurrent on the balance sheets.
OPCo
 
 
 
 
 
 
Changes in Accumulated Other Comprehensive Income (Loss) by Component
For the Year Ended December 31, 2016
 
 
 
 
 
 
 
 
 
Cash Flow Hedges
 
 
 
 
Commodity
 
Interest Rate
 
Total
 
 
(in millions)
Balance in AOCI as of December 31, 2015
 
$
—

 
$
4.3

 
$
4.3

Change in Fair Value Recognized in AOCI
 
—

 
—

 
—

Amount of (Gain) Loss Reclassified from AOCI
 
 
 
 
 
 
Interest Expense
 
—

 
(1.9
)
 
(1.9
)
Reclassifications from AOCI, before Income Tax (Expense) Credit
 
—

 
(1.9
)
 
(1.9
)
Income Tax (Expense) Credit
 
—

 
(0.6
)
 
(0.6
)
Reclassifications from AOCI, Net of Income Tax (Expense) Credit
 
—

 
(1.3
)
 
(1.3
)
Net Current Period Other Comprehensive Loss
 
—

 
(1.3
)
 
(1.3
)
Balance in AOCI as of December 31, 2016
 
$
—

 
$
3.0

 
$
3.0



OPCo
 
 
 
 
 
 
 
 
 
 
Changes in Accumulated Other Comprehensive Income (Loss) by Component
For the Year Ended December 31, 2015
 
 
 
 
 
 
 
 
 
 
 
 
 
Cash Flow Hedges
 
Pension and OPEB
 
 
 
 
Commodity
 
Interest Rate
 
Amortization of Deferred Costs
 
Changes in Funded Status
 
Total
 
 
(in millions)
Balance in AOCI as of December 31, 2014
 
$
—

 
$
5.6

 
$
58.4

 
$
(58.4
)
 
$
5.6

Change in Fair Value Recognized in AOCI
 
—

 
—

 
—

 
—

 
—

Amount of (Gain) Loss Reclassified from AOCI
 
 
 
 
 
 
 
 
 
 
Interest Expense
 
—

 
(2.0
)
 
—

 
—

 
(2.0
)
Reclassifications from AOCI, before Income Tax (Expense) Credit
 
—

 
(2.0
)
 
—

 
—

 
(2.0
)
Income Tax (Expense) Credit
 
—

 
(0.7
)
 
—

 
—

 
(0.7
)
Reclassifications from AOCI, Net of Income Tax (Expense) Credit
 
—

 
(1.3
)
 
—

 
—

 
(1.3
)
Net Current Period Other Comprehensive Loss
 
—

 
(1.3
)
 
—

 
—

 
(1.3
)
Balance in AOCI as of December 31, 2015
 
$
—

 
$
4.3

 
$
58.4

 
$
(58.4
)
 
$
4.3


OPCo
 
 
 
 
 
 
 
 
 
 
Changes in Accumulated Other Comprehensive Income (Loss) by Component
For the Year Ended December 31, 2014
 
 
 
 
 
 
 
 
 
 
 
 
 
Cash Flow Hedges
 
Pension and OPEB
 
 
 
 
Commodity
 
Interest Rate
 
Amortization of Deferred Costs
 
Changes in Funded Status
 
Total
 
 
(in millions)
Balance in AOCI as of December 31, 2013
 
$
0.1

 
$
7.0

 
$
58.4

 
$
(58.4
)
 
$
7.1

Change in Fair Value Recognized in AOCI
 
—

 
—

 
—

 
—

 
—

Amount of (Gain) Loss Reclassified from AOCI
 
 
 
 
 
 
 
 
 
 
Regulatory Assets/(Liabilities), Net (a)
 
(0.2
)
 
—

 
—

 
—

 
(0.2
)
Interest Expense
 
—

 
(2.1
)
 
—

 
—

 
(2.1
)
Reclassifications from AOCI, before Income Tax (Expense) Credit
 
(0.2
)
 
(2.1
)
 
—

 
—

 
(2.3
)
Income Tax (Expense) Credit
 
(0.1
)
 
(0.7
)
 
—

 
—

 
(0.8
)
Reclassifications from AOCI, Net of Income Tax (Expense) Credit
 
(0.1
)
 
(1.4
)
 
—

 
—

 
(1.5
)
Net Current Period Other Comprehensive Loss
 
(0.1
)
 
(1.4
)
 
—

 
—

 
(1.5
)
Balance in AOCI as of December 31, 2014
 
$
—

 
$
5.6

 
$
58.4

 
$
(58.4
)
 
$
5.6
Public Service Co Of Oklahoma [Member]  
Changes in Accumulated Other Comprehensive Income (Loss) by Component
PSO
 
 
 
 
 
 
Changes in Accumulated Other Comprehensive Income (Loss) by Component
For the Year Ended December 31, 2016
 
 
 
 
 
 
 
 
 
Cash Flow Hedges
 
 
 
 
Commodity
 
Interest Rate
 
Total
 
 
(in millions)
Balance in AOCI as of December 31, 2015
 
$
—

 
$
4.2

 
$
4.2

Change in Fair Value Recognized in AOCI
 
—

 
—

 
—

Amount of (Gain) Loss Reclassified from AOCI
 
 
 
 
 
 
Interest Expense
 
—

 
(1.2
)
 
(1.2
)
Reclassifications from AOCI, before Income Tax (Expense) Credit
 
—

 
(1.2
)
 
(1.2
)
Income Tax (Expense) Credit
 
—

 
(0.4
)
 
(0.4
)
Reclassifications from AOCI, Net of Income Tax (Expense) Credit
 
—

 
(0.8
)
 
(0.8
)
Net Current Period Other Comprehensive Loss
 
—

 
(0.8
)
 
(0.8
)
Balance in AOCI as of December 31, 2016
 
$
—

 
$
3.4

 
$
3.4


PSO
 
 
 
 
 
 
Changes in Accumulated Other Comprehensive Income (Loss) by Component
For the Year Ended December 31, 2015
 
 
 
 
 
 
 
 
 
Cash Flow Hedges
 
 
 
 
Commodity
 
Interest Rate
 
Total
 
 
(in millions)
Balance in AOCI as of December 31, 2014
 
$
—

 
$
5.0

 
$
5.0

Change in Fair Value Recognized in AOCI
 
—

 
—

 
—

Amount of (Gain) Loss Reclassified from AOCI
 
 
 
 
 
 
Interest Expense
 
—

 
(1.2
)
 
(1.2
)
Reclassifications from AOCI, before Income Tax (Expense) Credit
 
—

 
(1.2
)
 
(1.2
)
Income Tax (Expense) Credit
 
—

 
(0.4
)
 
(0.4
)
Reclassifications from AOCI, Net of Income Tax (Expense) Credit
 
—

 
(0.8
)
 
(0.8
)
Net Current Period Other Comprehensive Loss
 
—

 
(0.8
)
 
(0.8
)
Balance in AOCI as of December 31, 2015
 
$
—

 
$
4.2

 
$
4.2


PSO
 
 
 
 
 
 
Changes in Accumulated Other Comprehensive Income (Loss) by Component
For the Year Ended December 31, 2014
 
 
 
 
 
 
 
 
 
Cash Flow Hedges
 
 
 
 
Commodity
 
Interest Rate
 
Total
 
 
(in millions)
Balance in AOCI as of December 31, 2013
 
$
0.1

 
$
5.7

 
$
5.8

Change in Fair Value Recognized in AOCI
 
—

 
—

 
—

Amount of (Gain) Loss Reclassified from AOCI
 
 
 
 
 
 
Regulatory Assets/(Liabilities), Net (a)
 
(0.1
)
 
—

 
(0.1
)
Interest Expense
 
—

 
(1.1
)
 
(1.1
)
Reclassifications from AOCI, before Income Tax (Expense) Credit
 
(0.1
)
 
(1.1
)
 
(1.2
)
Income Tax (Expense) Credit
 
—

 
(0.4
)
 
(0.4
)
Reclassifications from AOCI, Net of Income Tax (Expense) Credit
 
(0.1
)
 
(0.7
)
 
(0.8
)
Net Current Period Other Comprehensive Loss
 
(0.1
)
 
(0.7
)
 
(0.8
)
Balance in AOCI as of December 31, 2014
 
$
—

 
$
5.0

 
$
5.0

(a)
Represents realized gains and losses subject to regulatory accounting treatment recorded as either current or noncurrent on the balance sheets.
Southwestern Electric Power Co [Member]  
Changes in Accumulated Other Comprehensive Income (Loss) by Component
SWEPCo
 
 
 
 
 
 
 
 
 
 
Changes in Accumulated Other Comprehensive Income (Loss) by Component
For the Year Ended December 31, 2016
 
 
 
 
 
 
 
 
 
 
 
 
 
Cash Flow Hedges
 
Pension and OPEB
 
 
 
 
Commodity
 
Interest Rate
 
Amortization of Deferred Costs
 
Changes in Funded Status
 
Total
 
 
(in millions)
Balance in AOCI as of December 31, 2015
 
$
—

 
$
(9.1
)
 
$
2.6

 
$
(2.9
)
 
$
(9.4
)
Change in Fair Value Recognized in AOCI
 
—

 
—

 
—

 
(1.0
)
 
(1.0
)
Amount of (Gain) Loss Reclassified from AOCI
 
 
 
 
 
 
 
 
 
 
Interest Expense
 
—

 
2.7

 
—

 
—

 
2.7

Amortization of Prior Service Cost (Credit)
 
—

 
—

 
(1.8
)
 
—

 
(1.8
)
Amortization of Actuarial (Gains)/Losses
 
—

 
—

 
0.7

 
—

 
0.7

Reclassifications from AOCI, before Income Tax (Expense) Credit
 
—

 
2.7

 
(1.1
)
 
—

 
1.6

Income Tax (Expense) Credit
 
—

 
1.0

 
(0.4
)
 
—

 
0.6

Reclassifications from AOCI, Net of Income Tax (Expense) Credit
 
—

 
1.7

 
(0.7
)
 
—

 
1.0

Net Current Period Other Comprehensive Income (Loss)
 
—

 
1.7

 
(0.7
)
 
(1.0
)
 
—

Balance in AOCI as of December 31, 2016
 
$
—

 
$
(7.4
)
 
$
1.9

 
$
(3.9
)
 
$
(9.4
)

SWEPCo
 
 
 
 
 
 
 
 
 
 
Changes in Accumulated Other Comprehensive Income (Loss) by Component
For the Year Ended December 31, 2015
 
 
 
 
 
 
 
 
 
 
 
 
 
Cash Flow Hedges
 
Pension and OPEB
 
 
 
 
Commodity
 
Interest Rate
 
Amortization of Deferred Costs
 
Changes in Funded Status
 
Total
 
 
(in millions)
Balance in AOCI as of December 31, 2014
 
$
—

 
$
(11.1
)
 
$
3.6

 
$
—

 
$
(7.5
)
Change in Fair Value Recognized in AOCI
 
—

 
—

 
—

 
(2.9
)
 
(2.9
)
Amount of (Gain) Loss Reclassified from AOCI
 
 
 
 
 
 
 
 
 
 
Interest Expense
 
—

 
3.1

 
—

 
—

 
3.1

Amortization of Prior Service Cost (Credit)
 
—

 
—

 
(1.9
)
 
—

 
(1.9
)
Amortization of Actuarial (Gains)/Losses
 
—

 
—

 
0.4

 
—

 
0.4

Reclassifications from AOCI, before Income Tax (Expense) Credit
 
—

 
3.1

 
(1.5
)
 
—

 
1.6

Income Tax (Expense) Credit
 
—

 
1.1

 
(0.5
)
 
—

 
0.6

Reclassifications from AOCI, Net of Income Tax (Expense) Credit
 
—

 
2.0

 
(1.0
)
 
—

 
1.0

Net Current Period Other Comprehensive Income (Loss)
 
—

 
2.0

 
(1.0
)
 
(2.9
)
 
(1.9
)
Balance in AOCI as of December 31, 2015
 
$
—

 
$
(9.1
)
 
$
2.6

 
$
(2.9
)
 
$
(9.4
)

SWEPCo
 
 
 
 
 
 
 
 
 
 
Changes in Accumulated Other Comprehensive Income (Loss) by Component
For the Year Ended December 31, 2014
 
 
 
 
 
 
 
 
 
 
 
 
 
Cash Flow Hedges
 
Pension and OPEB
 
 
 
 
Commodity
 
Interest Rate
 
Amortization of Deferred Costs
 
Changes in Funded Status
 
Total
 
 
(in millions)
Balance in AOCI as of December 31, 2013
 
$
—

 
$
(13.3
)
 
$
4.5

 
$
0.3

 
$
(8.5
)
Change in Fair Value Recognized in AOCI
 
—

 
—

 
—

 
(0.3
)
 
(0.3
)
Amount of (Gain) Loss Reclassified from AOCI
 
 
 
 
 
 
 
 
 
 
Regulatory Assets/(Liabilities), Net (a)
 
(0.1
)
 
—

 
—

 
—

 
(0.1
)
Interest Expense
 
—

 
3.5

 
—

 
—

 
3.5

Amortization of Prior Service Cost (Credit)
 
—

 
—

 
(1.9
)
 
—

 
(1.9
)
Amortization of Actuarial (Gains)/Losses
 
—

 
—

 
0.5

 
—

 
0.5

Reclassifications from AOCI, before Income Tax (Expense) Credit
 
(0.1
)
 
3.5

 
(1.4
)
 
—

 
2.0

Income Tax (Expense) Credit
 
(0.1
)
 
1.3

 
(0.5
)
 
—

 
0.7

Reclassifications from AOCI, Net of Income Tax (Expense) Credit
 
—

 
2.2

 
(0.9
)
 
—

 
1.3

Net Current Period Other Comprehensive Income (Loss)
 
—

 
2.2

 
(0.9
)
 
(0.3
)
 
1.0

Balance in AOCI as of December 31, 2014
 
$
—

 
$
(11.1
)
 
$
3.6

 
$
—

 
$
(7.5
)

(a)
Represents realized gains and losses subject to regulatory accounting treatment recorded as either current or noncurrent on the balance sheets.