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Comprehensive Income (Tables)
 6 Months Ended
Jun. 30, 2017
Changes in Accumulated Other Comprehensive Income by Component
AEP

Changes in Accumulated Other Comprehensive Income (Loss) by Component
For the Three Months Ended June 30, 2017
 
Cash Flow Hedges
 
 
 
 
 
 
 
Commodity
 
Interest Rate
 
Securities
Available for Sale
 
Pension
and OPEB
 
Total
 
(in millions)
Balance in AOCI as of March 31, 2017
$
(39.6
)
 
$
(15.3
)
 
$
9.6

 
$
(125.7
)
 
$
(171.0
)
Change in Fair Value Recognized in AOCI
(1.8
)
 
4.7

 
0.6

 
—

 
3.5

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

 
—

 
—

 
—

 
—

Purchased Electricity for Resale
8.3

 
—

 
—

 
—

 
8.3

Interest Expense
—

 
0.3

 
—

 
—

 
0.3

Amortization of Prior Service Cost (Credit)
—

 
—

 
—

 
(4.9
)
 
(4.9
)
Amortization of Actuarial (Gains)/Losses
—

 
—

 
—

 
5.3

 
5.3

Reclassifications from AOCI, before Income Tax (Expense) Credit
8.3

 
0.3

 
—

 
0.4

 
9.0

Income Tax (Expense) Credit
2.9

 
0.1

 
—

 
0.1

 
3.1

Reclassifications from AOCI, Net of Income Tax (Expense) Credit
5.4

 
0.2

 
—

 
0.3

 
5.9

Net Current Period Other Comprehensive Income
3.6

 
4.9

 
0.6

 
0.3

 
9.4

Balance in AOCI as of June 30, 2017
$
(36.0
)
 
$
(10.4
)
 
$
10.2

 
$
(125.4
)
 
$
(161.6
)

AEP

Changes in Accumulated Other Comprehensive Income (Loss) by Component
For the Three Months Ended June 30, 2016
 
Cash Flow Hedges
 
 
 
 
 
 
 
Commodity
 
Interest Rate
 
Securities
Available for Sale
 
Pension
and OPEB
 
Total
 
(in millions)
Balance in AOCI as of March 31, 2016
$
(12.9
)
 
$
(16.9
)
 
$
7.7

 
$
(111.7
)
 
$
(133.8
)
Change in Fair Value Recognized in AOCI
17.1

 
—

 
0.6

 
—

 
17.7

Amount of (Gain) Loss Reclassified from AOCI
 
 
 
 
 
 
 
 
 
Generation & Marketing Revenues
(6.7
)
 
—

 
—

 
—

 
(6.7
)
Purchased Electricity for Resale
3.2

 
—

 
—

 
—

 
3.2

Interest Expense
—

 
0.6

 
—

 
—

 
0.6

Amortization of Prior Service Cost (Credit)
—

 
—

 
—

 
(4.9
)
 
(4.9
)
Amortization of Actuarial (Gains)/Losses
—

 
—

 
—

 
5.1

 
5.1

Reclassifications from AOCI, before Income Tax (Expense) Credit
(3.5
)
 
0.6

 
—

 
0.2

 
(2.7
)
Income Tax (Expense) Credit
(1.2
)
 
0.2

 
—

 
0.1

 
(0.9
)
Reclassifications from AOCI, Net of Income Tax (Expense) Credit
(2.3
)
 
0.4

 
—

 
0.1

 
(1.8
)
Net Current Period Other Comprehensive Income
14.8

 
0.4

 
0.6

 
0.1

 
15.9

Balance in AOCI as of June 30, 2016
$
1.9

 
$
(16.5
)
 
$
8.3

 
$
(111.6
)
 
$
(117.9
)

AEP

Changes in Accumulated Other Comprehensive Income (Loss) by Component
For the Six Months Ended June 30, 2017
 
Cash Flow Hedges
 
 
 
 
 
 
 
Commodity
 
Interest Rate
 
Securities
Available for Sale
 
Pension
and OPEB
 
Total
 
(in millions)
Balance in AOCI as of December 31, 2016
$
(23.1
)
 
$
(15.7
)
 
$
8.4

 
$
(125.9
)
 
$
(156.3
)
Change in Fair Value Recognized in AOCI
(23.6
)
 
4.7

 
1.8

 
—

 
(17.1
)
Amount of (Gain) Loss Reclassified from AOCI
 
 
 
 
 
 
 
 
 
Generation & Marketing Revenues
(4.7
)
 
—

 
—

 
—

 
(4.7
)
Purchased Electricity for Resale
21.1

 
—

 
—

 
—

 
21.1

Interest Expense
—

 
0.8

 
—

 
—

 
0.8

Amortization of Prior Service Cost (Credit)
—

 
—

 
—

 
(9.8
)
 
(9.8
)
Amortization of Actuarial (Gains)/Losses
—

 
—

 
—

 
10.6

 
10.6

Reclassifications from AOCI, before Income Tax (Expense) Credit
16.4

 
0.8

 
—

 
0.8

 
18.0

Income Tax (Expense) Credit
5.7

 
0.2

 
—

 
0.3

 
6.2

Reclassifications from AOCI, Net of Income Tax (Expense) Credit
10.7

 
0.6

 
—

 
0.5

 
11.8

Net Current Period Other Comprehensive Income (Loss)
(12.9
)
 
5.3

 
1.8

 
0.5

 
(5.3
)
Balance in AOCI as of June 30, 2017
$
(36.0
)
 
$
(10.4
)
 
$
10.2

 
$
(125.4
)
 
$
(161.6
)

AEP

Changes in Accumulated Other Comprehensive Income (Loss) by Component
For the Six Months Ended June 30, 2016
 
Cash Flow Hedges
 
 
 
 
 
 
 
Commodity
 
Interest Rate
 
Securities
Available for Sale
 
Pension
and OPEB
 
Total
 
(in millions)
Balance in AOCI as of December 31, 2015
$
(5.2
)
 
$
(17.2
)
 
$
7.1

 
$
(111.8
)
 
$
(127.1
)
Change in Fair Value Recognized in AOCI
9.0

 
—

 
1.2

 
—

 
10.2

Amount of (Gain) Loss Reclassified from AOCI
 
 
 
 
 
 
 
 
 
Generation & Marketing Revenues
(15.3
)
 
—

 
—

 
—

 
(15.3
)
Purchased Electricity for Resale
12.4

 
—

 
—

 
—

 
12.4

Interest Expense
—

 
1.1

 
—

 
—

 
1.1

Amortization of Prior Service Cost (Credit)
—

 
—

 
—

 
(9.8
)
 
(9.8
)
Amortization of Actuarial (Gains)/Losses
—

 
—

 
—

 
10.2

 
10.2

Reclassifications from AOCI, before Income Tax (Expense) Credit
(2.9
)
 
1.1

 
—

 
0.4

 
(1.4
)
Income Tax (Expense) Credit
(1.0
)
 
0.4

 
—

 
0.2

 
(0.4
)
Reclassifications from AOCI, Net of Income Tax (Expense) Credit
(1.9
)
 
0.7

 
—

 
0.2

 
(1.0
)
Net Current Period Other Comprehensive Income
7.1

 
0.7

 
1.2

 
0.2

 
9.2

Balance in AOCI as of June 30, 2016
$
1.9

 
$
(16.5
)
 
$
8.3

 
$
(111.6
)
 
$
(117.9
)
Appalachian Power Co [Member]  
Changes in Accumulated Other Comprehensive Income by Component
APCo

Changes in Accumulated Other Comprehensive Income (Loss) by Component
For the Three Months Ended June 30, 2017
 
 
Cash Flow Hedges
 
 
 
 
 
 
Interest Rate
 
Pension
and OPEB
 
Total
 
 
(in millions)
Balance in AOCI as of March 31, 2017
 
$
2.7

 
$
(11.6
)
 
$
(8.9
)
Change in Fair Value Recognized in AOCI
 
—

 
—

 
—

Amount of (Gain) Loss Reclassified from AOCI
 
 
 
 
 
 
Interest Expense
 
(0.3
)
 
—

 
(0.3
)
Amortization of Prior Service Cost (Credit)
 
—

 
(1.3
)
 
(1.3
)
Amortization of Actuarial (Gains)/Losses
 
—

 
0.9

 
0.9

Reclassifications from AOCI, before Income Tax (Expense) Credit
 
(0.3
)
 
(0.4
)
 
(0.7
)
Income Tax (Expense) Credit
 
(0.1
)
 
(0.1
)
 
(0.2
)
Reclassifications from AOCI, Net of Income Tax (Expense) Credit
 
(0.2
)
 
(0.3
)
 
(0.5
)
Net Current Period Other Comprehensive Loss
 
(0.2
)
 
(0.3
)
 
(0.5
)
Balance in AOCI as of June 30, 2017
 
$
2.5

 
$
(11.9
)
 
$
(9.4
)

APCo

Changes in Accumulated Other Comprehensive Income (Loss) by Component
For the Three Months Ended June 30, 2016
 
 
Cash Flow Hedges
 
 
 
 
 
 
Interest Rate
 
Pension
and OPEB
 
Total
 
 
(in millions)
Balance in AOCI as of March 31, 2016
 
$
3.4

 
$
(6.7
)
 
$
(3.3
)
Change in Fair Value Recognized in AOCI
 
—

 
—

 
—

Amount of (Gain) Loss Reclassified from AOCI
 
 
 
 
 
 
Interest Expense
 
(0.3
)
 
—

 
(0.3
)
Amortization of Prior Service Cost (Credit)
 
—

 
(1.4
)
 
(1.4
)
Amortization of Actuarial (Gains)/Losses
 
—

 
0.8

 
0.8

Reclassifications from AOCI, before Income Tax (Expense) Credit
 
(0.3
)
 
(0.6
)
 
(0.9
)
Income Tax (Expense) Credit
 
(0.1
)
 
(0.2
)
 
(0.3
)
Reclassifications from AOCI, Net of Income Tax (Expense) Credit
 
(0.2
)
 
(0.4
)
 
(0.6
)
Net Current Period Other Comprehensive Loss
 
(0.2
)
 
(0.4
)
 
(0.6
)
Balance in AOCI as of June 30, 2016
 
$
3.2

 
$
(7.1
)
 
$
(3.9
)


APCo

Changes in Accumulated Other Comprehensive Income (Loss) by Component
For the Six Months Ended June 30, 2017
 
 
Cash Flow Hedges
 
 
 
 
 
 
Interest Rate
 
Pension
and OPEB
 
Total
 
 
(in millions)
Balance in AOCI as of December 31, 2016
 
$
2.9

 
$
(11.3
)
 
$
(8.4
)
Change in Fair Value Recognized in AOCI
 
—

 
—

 
—

Amount of (Gain) Loss Reclassified from AOCI
 
 
 
 
 
 
Interest Expense
 
(0.6
)
 
—

 
(0.6
)
Amortization of Prior Service Cost (Credit)
 
—

 
(2.6
)
 
(2.6
)
Amortization of Actuarial (Gains)/Losses
 
—

 
1.7

 
1.7

Reclassifications from AOCI, before Income Tax (Expense) Credit
 
(0.6
)
 
(0.9
)
 
(1.5
)
Income Tax (Expense) Credit
 
(0.2
)
 
(0.3
)
 
(0.5
)
Reclassifications from AOCI, Net of Income Tax (Expense) Credit
 
(0.4
)
 
(0.6
)
 
(1.0
)
Net Current Period Other Comprehensive Loss
 
(0.4
)
 
(0.6
)
 
(1.0
)
Balance in AOCI as of June 30, 2017
 
$
2.5

 
$
(11.9
)
 
$
(9.4
)

APCo

Changes in Accumulated Other Comprehensive Income (Loss) by Component
For the Six Months Ended June 30, 2016
 
 
Cash Flow Hedges
 
 
 
 
 
 
Interest Rate
 
Pension
and OPEB
 
Total
 
 
(in millions)
Balance in AOCI as of December 31, 2015
 
$
3.6

 
$
(6.4
)
 
$
(2.8
)
Change in Fair Value Recognized in AOCI
 
—

 
—

 
—

Amount of (Gain) Loss Reclassified from AOCI
 
 
 
 
 
 
Interest Expense
 
(0.6
)
 
—

 
(0.6
)
Amortization of Prior Service Cost (Credit)
 
—

 
(2.6
)
 
(2.6
)
Amortization of Actuarial (Gains)/Losses
 
—

 
1.5

 
1.5

Reclassifications from AOCI, before Income Tax (Expense) Credit
 
(0.6
)
 
(1.1
)
 
(1.7
)
Income Tax (Expense) Credit
 
(0.2
)
 
(0.4
)
 
(0.6
)
Reclassifications from AOCI, Net of Income Tax (Expense) Credit
 
(0.4
)
 
(0.7
)
 
(1.1
)
Net Current Period Other Comprehensive Loss
 
(0.4
)
 
(0.7
)
 
(1.1
)
Balance in AOCI as of June 30, 2016
 
$
3.2

 
$
(7.1
)
 
$
(3.9
)
Indiana Michigan Power Co [Member]  
Changes in Accumulated Other Comprehensive Income by Component
I&M

Changes in Accumulated Other Comprehensive Income (Loss) by Component
For the Three Months Ended June 30, 2017
 
 
Cash Flow Hedges
 
 
 
 
 
 
Interest Rate
 
Pension
and OPEB
 
Total
 
 
(in millions)
Balance in AOCI as of March 31, 2017
 
$
(11.7
)
 
$
(4.2
)
 
$
(15.9
)
Change in Fair Value Recognized in AOCI
 
—

 
—

 
—

Amount of (Gain) Loss Reclassified from AOCI
 
 
 
 
 
 
Interest Expense
 
0.5

 
—

 
0.5

Amortization of Prior Service Cost (Credit)
 
—

 
(0.2
)
 
(0.2
)
Amortization of Actuarial (Gains)/Losses
 
—

 
0.2

 
0.2

Reclassifications from AOCI, before Income Tax (Expense) Credit
 
0.5

 
—

 
0.5

Income Tax (Expense) Credit
 
0.1

 
—

 
0.1

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

 
—

 
0.4

Net Current Period Other Comprehensive Income
 
0.4

 
—

 
0.4

Balance in AOCI as of June 30, 2017
 
$
(11.3
)
 
$
(4.2
)
 
$
(15.5
)

I&M

Changes in Accumulated Other Comprehensive Income (Loss) by Component
For the Three Months Ended June 30, 2016
 
 
Cash Flow Hedges
 
 
 
 
 
 
Interest Rate
 
Pension
and OPEB
 
Total
 
 
(in millions)
Balance in AOCI as of March 31, 2016
 
$
(12.9
)
 
$
(3.4
)
 
$
(16.3
)
Change in Fair Value Recognized in AOCI
 
—

 
—

 
—

Amount of (Gain) Loss Reclassified from AOCI
 
 
 
 
 
 
Interest Expense
 
0.5

 
—

 
0.5

Amortization of Prior Service Cost (Credit)
 
—

 
(0.2
)
 
(0.2
)
Amortization of Actuarial (Gains)/Losses
 
—

 
0.2

 
0.2

Reclassifications from AOCI, before Income Tax (Expense) Credit
 
0.5

 
—

 
0.5

Income Tax (Expense) Credit
 
0.2

 
—

 
0.2

Reclassifications from AOCI, Net of Income Tax (Expense) Credit
 
0.3

 
—

 
0.3

Net Current Period Other Comprehensive Income
 
0.3

 
—

 
0.3

Balance in AOCI as of June 30, 2016
 
$
(12.6
)
 
$
(3.4
)
 
$
(16.0
)

I&M

Changes in Accumulated Other Comprehensive Income (Loss) by Component
For the Six Months Ended June 30, 2017
 
 
Cash Flow Hedges
 
 
 
 
 
 
Interest Rate
 
Pension
and OPEB
 
Total
 
 
(in millions)
Balance in AOCI as of December 31, 2016
 
$
(12.0
)
 
$
(4.2
)
 
$
(16.2
)
Change in Fair Value Recognized in AOCI
 
—

 
—

 
—

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

 
—

 
1.0

Amortization of Prior Service Cost (Credit)
 
—

 
(0.4
)
 
(0.4
)
Amortization of Actuarial (Gains)/Losses
 
—

 
0.4

 
0.4

Reclassifications from AOCI, before Income Tax (Expense) Credit
 
1.0

 
—

 
1.0

Income Tax (Expense) Credit
 
0.3

 
—

 
0.3

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

 
—

 
0.7

Net Current Period Other Comprehensive Income
 
0.7

 
—

 
0.7

Balance in AOCI as of June 30, 2017
 
$
(11.3
)
 
$
(4.2
)
 
$
(15.5
)

I&M

Changes in Accumulated Other Comprehensive Income (Loss) by Component
For the Six Months Ended June 30, 2016
 
 
Cash Flow Hedges
 
 
 
 
 
 
Interest Rate
 
Pension
and OPEB
 
Total
 
 
(in millions)
Balance in AOCI as of December 31, 2015
 
$
(13.3
)
 
$
(3.4
)
 
$
(16.7
)
Change in Fair Value Recognized in AOCI
 
—

 
—

 
—

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

 
—

 
1.0

Amortization of Prior Service Cost (Credit)
 
—

 
(0.4
)
 
(0.4
)
Amortization of Actuarial (Gains)/Losses
 
—

 
0.4

 
0.4

Reclassifications from AOCI, before Income Tax (Expense) Credit
 
1.0

 
—

 
1.0

Income Tax (Expense) Credit
 
0.3

 
—

 
0.3

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

 
—

 
0.7

Net Current Period Other Comprehensive Income
 
0.7

 
—

 
0.7

Balance in AOCI as of June 30, 2016
 
$
(12.6
)
 
$
(3.4
)
 
$
(16.0
)
Ohio Power Co [Member]  
Changes in Accumulated Other Comprehensive Income by Component
OPCo

Changes in Accumulated Other Comprehensive Income (Loss) by Component
For the Three Months Ended June 30, 2017
 
 
Cash Flow Hedges
 
 
Interest Rate
 
 
(in millions)
Balance in AOCI as of March 31, 2017
 
$
2.8

Change in Fair Value Recognized in AOCI
 
—

Amount of (Gain) Loss Reclassified from AOCI
 
 
Interest Expense
 
(0.4
)
Reclassifications from AOCI, before Income Tax (Expense) Credit
 
(0.4
)
Income Tax (Expense) Credit
 
(0.1
)
Reclassifications from AOCI, Net of Income Tax (Expense) Credit
 
(0.3
)
Net Current Period Other Comprehensive Loss
 
(0.3
)
Balance in AOCI as of June 30, 2017
 
$
2.5


OPCo

Changes in Accumulated Other Comprehensive Income (Loss) by Component
For the Three Months Ended June 30, 2016
 
 
Cash Flow Hedges
 
 
Interest Rate
 
 
(in millions)
Balance in AOCI as of March 31, 2016
 
$
3.9

Change in Fair Value Recognized in AOCI
 
—

Amount of (Gain) Loss Reclassified from AOCI
 
 
Interest Expense
 
(0.6
)
Reclassifications from AOCI, before Income Tax (Expense) Credit
 
(0.6
)
Income Tax (Expense) Credit
 
(0.2
)
Reclassifications from AOCI, Net of Income Tax (Expense) Credit
 
(0.4
)
Net Current Period Other Comprehensive Loss
 
(0.4
)
Balance in AOCI as of June 30, 2016
 
$
3.5


OPCo

Changes in Accumulated Other Comprehensive Income (Loss) by Component
For the Six Months Ended June 30, 2017
 
 
Cash Flow Hedges
 
 
Interest Rate
 
 
(in millions)
Balance in AOCI as of December 31, 2016
 
$
3.0

Change in Fair Value Recognized in AOCI
 
—

Amount of (Gain) Loss Reclassified from AOCI
 
 
Interest Expense
 
(0.8
)
Reclassifications from AOCI, before Income Tax (Expense) Credit
 
(0.8
)
Income Tax (Expense) Credit
 
(0.3
)
Reclassifications from AOCI, Net of Income Tax (Expense) Credit
 
(0.5
)
Net Current Period Other Comprehensive Loss
 
(0.5
)
Balance in AOCI as of June 30, 2017
 
$
2.5


OPCo

Changes in Accumulated Other Comprehensive Income (Loss) by Component
For the Six Months Ended June 30, 2016
 
 
Cash Flow Hedges
 
 
Interest Rate
 
 
(in millions)
Balance in AOCI as of December 31, 2015
 
$
4.3

Change in Fair Value Recognized in AOCI
 
—

Amount of (Gain) Loss Reclassified from AOCI
 
 
Interest Expense
 
(1.1
)
Reclassifications from AOCI, before Income Tax (Expense) Credit
 
(1.1
)
Income Tax (Expense) Credit
 
(0.3
)
Reclassifications from AOCI, Net of Income Tax (Expense) Credit
 
(0.8
)
Net Current Period Other Comprehensive Loss
 
(0.8
)
Balance in AOCI as of June 30, 2016
 
$
3.5
Public Service Co Of Oklahoma [Member]  
Changes in Accumulated Other Comprehensive Income by Component
PSO

Changes in Accumulated Other Comprehensive Income (Loss) by Component
For the Three Months Ended June 30, 2017
 
 
Cash Flow Hedges
 
 
Interest Rate
 
 
(in millions)
Balance in AOCI as of March 31, 2017
 
$
3.2

Change in Fair Value Recognized in AOCI
 
—

Amount of (Gain) Loss Reclassified from AOCI
 
 
Interest Expense
 
(0.3
)
Reclassifications from AOCI, before Income Tax (Expense) Credit
 
(0.3
)
Income Tax (Expense) Credit
 
(0.1
)
Reclassifications from AOCI, Net of Income Tax (Expense) Credit
 
(0.2
)
Net Current Period Other Comprehensive Loss
 
(0.2
)
Balance in AOCI as of June 30, 2017
 
$
3.0

 
PSO

Changes in Accumulated Other Comprehensive Income (Loss) by Component
For the Three Months Ended June 30, 2016
 
 
Cash Flow Hedges
 
 
Interest Rate
 
 
(in millions)
Balance in AOCI as of March 31, 2016
 
$
4.0

Change in Fair Value Recognized in AOCI
 
—

Amount of (Gain) Loss Reclassified from AOCI
 
 
Interest Expense
 
(0.3
)
Reclassifications from AOCI, before Income Tax (Expense) Credit
 
(0.3
)
Income Tax (Expense) Credit
 
(0.1
)
Reclassifications from AOCI, Net of Income Tax (Expense) Credit
 
(0.2
)
Net Current Period Other Comprehensive Loss
 
(0.2
)
Balance in AOCI as of June 30, 2016
 
$
3.8


PSO

Changes in Accumulated Other Comprehensive Income (Loss) by Component
For the Six Months Ended June 30, 2017
 
 
Cash Flow Hedges
 
 
Interest Rate
 
 
(in millions)
Balance in AOCI as of December 31, 2016
 
$
3.4

Change in Fair Value Recognized in AOCI
 
—

Amount of (Gain) Loss Reclassified from AOCI
 
 
Interest Expense
 
(0.6
)
Reclassifications from AOCI, before Income Tax (Expense) Credit
 
(0.6
)
Income Tax (Expense) Credit
 
(0.2
)
Reclassifications from AOCI, Net of Income Tax (Expense) Credit
 
(0.4
)
Net Current Period Other Comprehensive Loss
 
(0.4
)
Balance in AOCI as of June 30, 2017
 
$
3.0


PSO

Changes in Accumulated Other Comprehensive Income (Loss) by Component
For the Six Months Ended June 30, 2016
 
 
Cash Flow Hedges
 
 
Interest Rate
 
 
(in millions)
Balance in AOCI as of December 31, 2015
 
$
4.2

Change in Fair Value Recognized in AOCI
 
—

Amount of (Gain) Loss Reclassified from AOCI
 
 
Interest Expense
 
(0.6
)
Reclassifications from AOCI, before Income Tax (Expense) Credit
 
(0.6
)
Income Tax (Expense) Credit
 
(0.2
)
Reclassifications from AOCI, Net of Income Tax (Expense) Credit
 
(0.4
)
Net Current Period Other Comprehensive Loss
 
(0.4
)
Balance in AOCI as of June 30, 2016
 
$
3.8
Southwestern Electric Power Co [Member]  
Changes in Accumulated Other Comprehensive Income by Component
SWEPCo

Changes in Accumulated Other Comprehensive Income (Loss) by Component
For the Three Months Ended June 30, 2017
 
 
Cash Flow Hedges
 
 
 
 
 
 
Interest Rate
 
Pension
and OPEB
 
Total
 
 
(in millions)
Balance in AOCI as of March 31, 2017
 
$
(6.9
)
 
$
(2.2
)
 
$
(9.1
)
Change in Fair Value Recognized in AOCI
 
—

 
—

 
—

Amount of (Gain) Loss Reclassified from AOCI
 
 
 
 
 
 
Interest Expense
 
0.4

 
—

 
0.4

Amortization of Prior Service Cost (Credit)
 
—

 
(0.5
)
 
(0.5
)
Amortization of Actuarial (Gains)/Losses
 
—

 
0.3

 
0.3

Reclassifications from AOCI, before Income Tax (Expense) Credit
 
0.4

 
(0.2
)
 
0.2

Income Tax (Expense) Credit
 
0.2

 
(0.1
)
 
0.1

Reclassifications from AOCI, Net of Income Tax (Expense) Credit
 
0.2

 
(0.1
)
 
0.1

Net Current Period Other Comprehensive Income (Loss)
 
0.2

 
(0.1
)
 
0.1

Balance in AOCI as of June 30, 2017
 
$
(6.7
)
 
$
(2.3
)
 
$
(9.0
)

SWEPCo

Changes in Accumulated Other Comprehensive Income (Loss) by Component
For the Three Months Ended June 30, 2016
 
 
Cash Flow Hedges
 
 
 
 
 
 
Interest Rate
 
Pension
and OPEB
 
Total
 
 
(in millions)
Balance in AOCI as of March 31, 2016
 
$
(8.6
)
 
$
(0.5
)
 
$
(9.1
)
Change in Fair Value Recognized in AOCI
 
—

 
—

 
—

Amount of (Gain) Loss Reclassified from AOCI
 
 
 
 
 
 
Interest Expense
 
0.6

 
—

 
0.6

Amortization of Prior Service Cost (Credit)
 
—

 
(0.5
)
 
(0.5
)
Amortization of Actuarial (Gains)/Losses
 
—

 
0.2

 
0.2

Reclassifications from AOCI, before Income Tax (Expense) Credit
 
0.6

 
(0.3
)
 
0.3

Income Tax (Expense) Credit
 
0.2

 
(0.1
)
 
0.1

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

 
(0.2
)
 
0.2

Net Current Period Other Comprehensive Income (Loss)
 
0.4

 
(0.2
)
 
0.2

Balance in AOCI as of June 30, 2016
 
$
(8.2
)
 
$
(0.7
)
 
$
(8.9
)

SWEPCo

Changes in Accumulated Other Comprehensive Income (Loss) by Component
For the Six Months Ended June 30, 2017
 
 
Cash Flow Hedges
 
 
 
 
 
 
Interest Rate
 
Pension
and OPEB
 
Total
 
 
(in millions)
Balance in AOCI as of December 31, 2016
 
$
(7.4
)
 
$
(2.0
)
 
$
(9.4
)
Change in Fair Value Recognized in AOCI
 
—

 
—

 
—

Amount of (Gain) Loss Reclassified from AOCI
 
 
 
 
 
 
Interest Expense
 
1.1

 
—

 
1.1

Amortization of Prior Service Cost (Credit)
 
—

 
(1.0
)
 
(1.0
)
Amortization of Actuarial (Gains)/Losses
 
—

 
0.5

 
0.5

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

 
(0.5
)
 
0.6

Income Tax (Expense) Credit
 
0.4

 
(0.2
)
 
0.2

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

 
(0.3
)
 
0.4

Net Current Period Other Comprehensive Income (Loss)
 
0.7

 
(0.3
)
 
0.4

Balance in AOCI as of June 30, 2017
 
$
(6.7
)
 
$
(2.3
)
 
$
(9.0
)

SWEPCo

Changes in Accumulated Other Comprehensive Income (Loss) by Component
For the Six Months Ended June 30, 2016
 
 
Cash Flow Hedges
 
 
 
 
 
 
Interest Rate
 
Pension
and OPEB
 
Total
 
 
(in millions)
Balance in AOCI as of December 31, 2015
 
$
(9.1
)
 
$
(0.3
)
 
$
(9.4
)
Change in Fair Value Recognized in AOCI
 
—

 
—

 
—

Amount of (Gain) Loss Reclassified from AOCI
 
 
 
 
 
 
Interest Expense
 
1.3

 
—

 
1.3

Amortization of Prior Service Cost (Credit)
 
—

 
(1.0
)
 
(1.0
)
Amortization of Actuarial (Gains)/Losses
 
—

 
0.4

 
0.4

Reclassifications from AOCI, before Income Tax (Expense) Credit
 
1.3

 
(0.6
)
 
0.7

Income Tax (Expense) Credit
 
0.4

 
(0.2
)
 
0.2

Reclassifications from AOCI, Net of Income Tax (Expense) Credit
 
0.9

 
(0.4
)
 
0.5

Net Current Period Other Comprehensive Income (Loss)
 
0.9

 
(0.4
)
 
0.5

Balance in AOCI as of June 30, 2016
 
$
(8.2
)
 
$
(0.7
)
 
$
(8.9
)