Income Taxes (Details) - USD ($) $ in Millions |
3 Months Ended |
12 Months Ended |
Dec. 31, 2015 |
Sep. 30, 2015 |
Jun. 30, 2015 |
Mar. 31, 2015 |
Dec. 31, 2014 |
Sep. 30, 2014 |
Jun. 30, 2014 |
Mar. 31, 2014 |
Jun. 30, 2013 |
Dec. 31, 2015 |
Dec. 31, 2014 |
Dec. 31, 2013 |
Dec. 31, 2012 |
Dec. 31, 2011 |
Federal: |
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Current |
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$ 107.3
|
$ 22.8
|
$ (53.4)
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Deferred |
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|
|
|
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|
774.8
|
800.1
|
678.6
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Total Federal |
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882.1
|
822.9
|
625.2
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State and Local: |
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Current |
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14.5
|
22.8
|
28.7
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Deferred |
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23.0
|
56.9
|
23.8
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Total State and Local |
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37.5
|
79.7
|
52.5
|
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Income Tax Expense: |
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Deferred |
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|
808.2
|
868.8
|
711.2
|
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|
Reconciliation of Federal Income Taxes and Amount of Income Tax Reported |
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Net Income |
$ 470.7
|
|
$ 519.6
|
$ 431.3
|
$ 630.7
|
$ 191.5
|
[1] |
$ 494.4
|
$ 391.1
|
$ 561.0
|
|
2,052.3
|
1,638.0
|
1,484.2
|
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|
Discontinued Operations |
(265.5)
|
[2] |
(7.8)
|
0.1
|
(10.5)
|
(31.9)
|
|
(10.2)
|
(2.7)
|
(2.7)
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|
(283.7)
|
(47.5)
|
(10.3)
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Income Tax Expense (Credit) |
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919.6
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902.6
|
677.7
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Pretax Income |
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2,688.2
|
2,493.1
|
2,151.6
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|
Income Taxes on Pretax Income at Statutory Rate (35%) |
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|
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|
940.9
|
872.6
|
753.1
|
|
|
Reconciliation of Federal Statutory Rate and Amount of Taxes Reported |
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Depreciation |
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53.6
|
54.0
|
46.6
|
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Investment Tax Credits, Net |
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(11.6)
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(12.8)
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(14.0)
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State and Local Income Taxes, Net |
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24.4
|
54.3
|
29.1
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Removal Costs |
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(28.8)
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(23.9)
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(20.9)
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AFUDC |
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(51.6)
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(41.8)
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(30.5)
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Valuation Allowance |
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17.2
|
(2.5)
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5.1
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U.K. Windfall Tax |
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0.0
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0.0
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(79.5)
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Other |
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(24.5)
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2.7
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(11.3)
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Income Tax Expense (Credit) |
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|
$ 919.6
|
$ 902.6
|
$ 677.7
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Net Deferred Tax Liability and Significant Temporary Differences |
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Effective Income Tax Rate |
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34.20876%
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36.20392%
|
31.49749%
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Deferred Tax Assets |
2,503.9
|
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|
2,650.7
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|
$ 2,503.9
|
$ 2,650.7
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Deferred Tax Liabilities |
(14,237.1)
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|
|
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|
(13,503.1)
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|
(14,237.1)
|
(13,503.1)
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Property Related Temporary Differences |
(8,533.3)
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|
(7,883.4)
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|
(8,533.3)
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(7,883.4)
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Amounts Due from Customers for Future Federal Income Taxes |
(263.5)
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|
(255.2)
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|
(263.5)
|
(255.2)
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Deferred State Income Taxes |
(872.0)
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|
(796.9)
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(872.0)
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(796.9)
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Securitized Assets |
(633.2)
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(753.2)
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(633.2)
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(753.2)
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Regulatory Assets |
(873.6)
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(694.1)
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(873.6)
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(694.1)
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Deferred Income Taxes on Other Comprehensive Loss |
72.2
|
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|
59.7
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|
72.2
|
59.7
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Accrued Nuclear Decommissioning |
(614.6)
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(611.0)
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(614.6)
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(611.0)
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Net Operating Loss Carryforward |
39.6
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46.4
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39.6
|
46.4
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Tax Credit Carryforward |
85.0
|
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|
144.3
|
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85.0
|
144.3
|
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Valuation Allowance |
(130.0)
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(55.6)
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(130.0)
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(55.6)
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All Other, Net |
(9.8)
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(53.4)
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(9.8)
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(53.4)
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Net Deferred Tax Liabilities |
(11,733.2)
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(10,852.4)
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(11,733.2)
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(10,852.4)
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Summary of Amounts Reported for Interest Expense, Interest Income and Reversal of Prior Period Interest Expense |
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Interest Expense |
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2.7
|
2.9
|
$ 1.5
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Interest Income |
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0.8
|
1.2
|
51.8
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Reversal of Prior Period Interest Expense |
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0.0
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2.0
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0.0
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Amounts Accrued for Receipt of Interest and Payment of Interest and Penalties |
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Accrual for Receipt of Interest |
44.7
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44.0
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44.7
|
44.0
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Accrual for Payment of Interest and Penalties |
7.2
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|
5.9
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7.2
|
5.9
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|
Reconciliation of the Beginning and Ending Amount of Unrecognized Tax Benefits |
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Balance at January 1, |
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|
182.0
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175.2
|
|
182.0
|
175.2
|
267.2
|
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|
Increase - Tax Positions Taken During a Prior Period |
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5.4
|
18.2
|
0.0
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Decrease - Tax Positions Taken During a Prior Period |
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(0.4)
|
(1.5)
|
(93.6)
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Increase - Tax Positions Taken During the Current Year |
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0.0
|
0.0
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1.8
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Decrease - Tax Positions Taken During the Current Year |
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0.0
|
0.0
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0.0
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Increase - Settlements with Taxing Authorities |
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0.0
|
0.0
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Decrease - Settlements with Taxing Authorities |
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0.0
|
(0.6)
|
0.0
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Decrease - Lapse of the Applicable Statute of Limitations |
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0.0
|
(9.3)
|
(0.2)
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|
Balance at December 31, |
187.0
|
|
|
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|
182.0
|
|
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|
|
187.0
|
182.0
|
175.2
|
$ 267.2
|
|
Unrecognized Tax Benefits, if Recognized - Amount |
100.2
|
|
|
|
|
97.2
|
|
|
|
|
|
$ 100.2
|
97.2
|
86.9
|
|
|
Income Taxes (Textuals) [Abstract] |
|
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Discontinued Operations |
|
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|
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|
$ 39.0
|
$ 5.9
|
|
|
Statutory Tax Rate on Pretax Income |
|
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|
|
|
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|
35.00%
|
35.00%
|
35.00%
|
|
|
Federal Net Income Tax Operating Loss |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
366.0
|
$ 226.0
|
Income Tax Expense (Credit) |
|
|
|
|
|
|
|
|
|
|
|
$ 919.6
|
$ 902.6
|
$ 677.7
|
|
|
Interest Income |
|
|
|
|
|
|
|
|
|
|
|
7.9
|
7.4
|
57.9
|
|
|
Net Income (Loss) |
470.7
|
|
519.6
|
431.3
|
630.7
|
191.5
|
[1] |
494.4
|
391.1
|
561.0
|
|
$ 2,052.3
|
$ 1,638.0
|
1,484.2
|
|
|
Period With No Receipt Of Cash Expected |
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|
12 months
|
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Period with No Change in Unrecognized Tax Benefits |
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|
12 months
|
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|
Indiana Corporate Income Tax Rate |
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|
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|
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|
8.50%
|
|
|
|
|
Reduced Indiana Corporate Income Tax Rate |
|
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|
|
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|
6.50%
|
|
|
|
|
Reduction In Indiana Corporate Tax Rate |
|
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|
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|
0.50%
|
|
|
|
|
Original WV Corporate Income Tax Rate |
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|
|
|
|
|
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|
|
7.00%
|
|
|
|
Reduced WV Corporate Income Tax |
|
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|
|
|
|
|
|
|
|
|
|
6.50%
|
|
|
|
Pre-2016 TX Income/Franchise Tax Rate |
|
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|
|
|
|
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|
0.95%
|
|
|
|
|
New TX Income/Franchise Tax Rate |
|
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|
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|
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|
0.75%
|
|
|
|
|
Anticipated TX Income/Franchise Tax Rate |
|
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|
|
|
|
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|
|
|
1.00%
|
|
|
|
|
Valuation Allowance Expiration Of Charitable Contribution Carryforward Deductions |
17.0
|
|
|
|
|
|
|
|
|
|
|
$ 17.0
|
|
|
|
|
Valuation Allowance Excess Tax Basis Of Stock Over Book Value |
156.0
|
|
|
|
|
|
|
|
|
|
|
156.0
|
|
|
|
|
Valuation Allowance Realized Capital Losses From Sale |
48.0
|
|
|
|
|
|
|
|
|
|
|
48.0
|
|
|
|
|
Valuation Allowance |
(130.0)
|
|
|
|
|
(55.6)
|
|
|
|
|
|
(130.0)
|
$ (55.6)
|
|
|
|
Appalachian Power Co [Member] |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Income Tax Expense: |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Current |
|
|
|
|
|
|
|
|
|
|
|
(32.9)
|
10.9
|
58.4
|
|
|
Deferred |
|
|
|
|
|
|
|
|
|
|
|
227.5
|
144.7
|
75.7
|
|
|
Deferred Investment Tax Credits |
|
|
|
|
|
|
|
|
|
|
|
(0.3)
|
(0.7)
|
(1.2)
|
|
|
Reconciliation of Federal Income Taxes and Amount of Income Tax Reported |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Net Income |
65.2
|
|
74.6
|
59.0
|
141.8
|
28.6
|
|
48.8
|
36.2
|
101.8
|
|
340.6
|
215.4
|
193.2
|
|
|
Discontinued Operations |
0.0
|
|
0.0
|
0.0
|
0.0
|
0.0
|
|
0.0
|
0.0
|
0.0
|
|
|
|
|
|
|
Income Tax Expense (Credit) |
|
|
|
|
|
|
|
|
|
|
|
194.3
|
154.9
|
132.9
|
|
|
Pretax Income |
|
|
|
|
|
|
|
|
|
|
|
534.9
|
370.3
|
326.1
|
|
|
Income Taxes on Pretax Income at Statutory Rate (35%) |
|
|
|
|
|
|
|
|
|
|
|
187.2
|
129.6
|
114.1
|
|
|
Reconciliation of Federal Statutory Rate and Amount of Taxes Reported |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Depreciation |
|
|
|
|
|
|
|
|
|
|
|
19.8
|
23.5
|
20.3
|
|
|
Investment Tax Credits, Net |
|
|
|
|
|
|
|
|
|
|
|
(0.3)
|
(0.6)
|
(1.2)
|
|
|
State and Local Income Taxes, Net |
|
|
|
|
|
|
|
|
|
|
|
7.2
|
6.5
|
2.7
|
|
|
Removal Costs |
|
|
|
|
|
|
|
|
|
|
|
(9.9)
|
(6.8)
|
(6.5)
|
|
|
AFUDC |
|
|
|
|
|
|
|
|
|
|
|
(7.0)
|
(3.8)
|
(1.4)
|
|
|
Valuation Allowance |
|
|
|
|
|
|
|
|
|
|
|
1.7
|
(2.5)
|
5.1
|
|
|
Other |
|
|
|
|
|
|
|
|
|
|
|
(4.4)
|
9.0
|
(0.2)
|
|
|
Income Tax Expense (Credit) |
|
|
|
|
|
|
|
|
|
|
|
$ 194.3
|
$ 154.9
|
$ 132.9
|
|
|
Net Deferred Tax Liability and Significant Temporary Differences |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Effective Income Tax Rate |
|
|
|
|
|
|
|
|
|
|
|
36.32455%
|
41.83095%
|
40.75437%
|
|
|
Deferred Tax Assets |
412.9
|
|
|
|
|
446.4
|
|
|
|
|
|
$ 412.9
|
$ 446.4
|
|
|
|
Deferred Tax Liabilities |
(2,939.9)
|
|
|
|
|
(2,711.2)
|
|
|
|
|
|
(2,939.9)
|
(2,711.2)
|
|
|
|
Property Related Temporary Differences |
(1,866.0)
|
|
|
|
|
(1,801.9)
|
|
|
|
|
|
(1,866.0)
|
(1,801.9)
|
|
|
|
Amounts Due from Customers for Future Federal Income Taxes |
(68.2)
|
|
|
|
|
(70.4)
|
|
|
|
|
|
(68.2)
|
(70.4)
|
|
|
|
Deferred State Income Taxes |
(308.7)
|
|
|
|
|
(239.7)
|
|
|
|
|
|
(308.7)
|
(239.7)
|
|
|
|
Securitized Assets |
(114.8)
|
|
|
|
|
(122.6)
|
|
|
|
|
|
(114.8)
|
(122.6)
|
|
|
|
Regulatory Assets |
(169.1)
|
|
|
|
|
(113.7)
|
|
|
|
|
|
(169.1)
|
(113.7)
|
|
|
|
Deferred Income Taxes on Other Comprehensive Loss |
1.5
|
|
|
|
|
(2.7)
|
|
|
|
|
|
1.5
|
(2.7)
|
|
|
|
Net Operating Loss Carryforward |
1.0
|
|
|
|
|
9.8
|
|
|
|
|
|
1.0
|
9.8
|
|
|
|
Tax Credit Carryforward |
19.2
|
|
|
|
|
46.2
|
|
|
|
|
|
19.2
|
46.2
|
|
|
|
All Other, Net |
(21.9)
|
|
|
|
|
30.2
|
|
|
|
|
|
(21.9)
|
30.2
|
|
|
|
Net Deferred Tax Liabilities |
(2,527.0)
|
|
|
|
|
(2,264.8)
|
|
|
|
|
|
(2,527.0)
|
(2,264.8)
|
|
|
|
Summary of Amounts Reported for Interest Expense, Interest Income and Reversal of Prior Period Interest Expense |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Interest Expense |
|
|
|
|
|
|
|
|
|
|
|
0.4
|
0.0
|
$ 0.0
|
|
|
Interest Income |
|
|
|
|
|
|
|
|
|
|
|
0.0
|
0.0
|
1.1
|
|
|
Reversal of Prior Period Interest Expense |
|
|
|
|
|
|
|
|
|
|
|
0.0
|
0.2
|
0.0
|
|
|
Amounts Accrued for Receipt of Interest and Payment of Interest and Penalties |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Accrual for Receipt of Interest |
0.0
|
|
|
|
|
0.0
|
|
|
|
|
|
0.0
|
0.0
|
|
|
|
Accrual for Payment of Interest and Penalties |
0.0
|
|
|
|
|
0.0
|
|
|
|
|
|
0.0
|
0.0
|
|
|
|
Reconciliation of the Beginning and Ending Amount of Unrecognized Tax Benefits |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Balance at January 1, |
|
|
|
|
0.0
|
|
|
|
|
1.2
|
|
0.0
|
1.2
|
5.3
|
|
|
Increase - Tax Positions Taken During a Prior Period |
|
|
|
|
|
|
|
|
|
|
|
0.3
|
0.0
|
0.0
|
|
|
Decrease - Tax Positions Taken During a Prior Period |
|
|
|
|
|
|
|
|
|
|
|
0.0
|
0.0
|
(4.1)
|
|
|
Increase - Tax Positions Taken During the Current Year |
|
|
|
|
|
|
|
|
|
|
|
0.0
|
0.0
|
0.0
|
|
|
Decrease - Tax Positions Taken During the Current Year |
|
|
|
|
|
|
|
|
|
|
|
0.0
|
0.0
|
0.0
|
|
|
Increase - Settlements with Taxing Authorities |
|
|
|
|
|
|
|
|
|
|
|
0.0
|
0.0
|
|
|
|
Decrease - Settlements with Taxing Authorities |
|
|
|
|
|
|
|
|
|
|
|
0.0
|
0.0
|
0.0
|
|
|
Decrease - Lapse of the Applicable Statute of Limitations |
|
|
|
|
|
|
|
|
|
|
|
0.0
|
(1.2)
|
0.0
|
|
|
Balance at December 31, |
0.3
|
|
|
|
|
0.0
|
|
|
|
|
|
0.3
|
0.0
|
1.2
|
5.3
|
|
Unrecognized Tax Benefits, if Recognized - Amount |
0.2
|
|
|
|
|
0.0
|
|
|
|
|
|
$ 0.2
|
$ 0.0
|
$ 0.0
|
|
|
Income Taxes (Textuals) [Abstract] |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Statutory Tax Rate on Pretax Income |
|
|
|
|
|
|
|
|
|
|
|
35.00%
|
35.00%
|
35.00%
|
|
|
Federal Net Income Tax Operating Loss |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
313.0
|
Income Tax Expense (Credit) |
|
|
|
|
|
|
|
|
|
|
|
$ 194.3
|
$ 154.9
|
$ 132.9
|
|
|
Net Income (Loss) |
65.2
|
|
74.6
|
59.0
|
141.8
|
28.6
|
|
48.8
|
36.2
|
101.8
|
|
$ 340.6
|
$ 215.4
|
193.2
|
|
|
Period with No Change in Unrecognized Tax Benefits |
|
|
|
|
|
|
|
|
|
|
|
12 months
|
|
|
|
|
Indiana Corporate Income Tax Rate |
|
|
|
|
|
|
|
|
|
|
|
8.50%
|
|
|
|
|
Reduced Indiana Corporate Income Tax Rate |
|
|
|
|
|
|
|
|
|
|
|
6.50%
|
|
|
|
|
Reduction In Indiana Corporate Tax Rate |
|
|
|
|
|
|
|
|
|
|
|
0.50%
|
|
|
|
|
Original WV Corporate Income Tax Rate |
|
|
|
|
|
|
|
|
|
|
|
|
7.00%
|
|
|
|
Reduced WV Corporate Income Tax |
|
|
|
|
|
|
|
|
|
|
|
|
6.50%
|
|
|
|
Indiana Michigan Power Co [Member] |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Income Tax Expense: |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Current |
|
|
|
|
|
|
|
|
|
|
|
$ 5.2
|
$ 14.3
|
(49.1)
|
|
|
Deferred |
|
|
|
|
|
|
|
|
|
|
|
94.2
|
70.2
|
129.1
|
|
|
Deferred Investment Tax Credits |
|
|
|
|
|
|
|
|
|
|
|
(3.3)
|
(4.9)
|
(4.9)
|
|
|
Reconciliation of Federal Income Taxes and Amount of Income Tax Reported |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Net Income |
24.9
|
|
56.6
|
50.6
|
72.7
|
14.6
|
|
26.6
|
27.3
|
87.1
|
|
204.8
|
155.6
|
177.5
|
|
|
Discontinued Operations |
0.0
|
|
0.0
|
0.0
|
0.0
|
0.0
|
|
0.0
|
0.0
|
0.0
|
|
|
|
|
|
|
Income Tax Expense (Credit) |
|
|
|
|
|
|
|
|
|
|
|
96.1
|
79.6
|
75.1
|
|
|
Pretax Income |
|
|
|
|
|
|
|
|
|
|
|
300.9
|
235.2
|
252.6
|
|
|
Income Taxes on Pretax Income at Statutory Rate (35%) |
|
|
|
|
|
|
|
|
|
|
|
105.3
|
82.3
|
88.4
|
|
|
Reconciliation of Federal Statutory Rate and Amount of Taxes Reported |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Depreciation |
|
|
|
|
|
|
|
|
|
|
|
9.5
|
12.9
|
10.1
|
|
|
Investment Tax Credits, Net |
|
|
|
|
|
|
|
|
|
|
|
(3.3)
|
(4.9)
|
(4.9)
|
|
|
State and Local Income Taxes, Net |
|
|
|
|
|
|
|
|
|
|
|
5.8
|
7.7
|
(0.9)
|
|
|
Removal Costs |
|
|
|
|
|
|
|
|
|
|
|
(12.6)
|
(11.3)
|
(9.4)
|
|
|
AFUDC |
|
|
|
|
|
|
|
|
|
|
|
(6.2)
|
(10.0)
|
(10.6)
|
|
|
Other |
|
|
|
|
|
|
|
|
|
|
|
(2.4)
|
2.9
|
2.4
|
|
|
Income Tax Expense (Credit) |
|
|
|
|
|
|
|
|
|
|
|
$ 96.1
|
$ 79.6
|
$ 75.1
|
|
|
Net Deferred Tax Liability and Significant Temporary Differences |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Effective Income Tax Rate |
|
|
|
|
|
|
|
|
|
|
|
31.93752%
|
33.84354%
|
29.7308%
|
|
|
Deferred Tax Assets |
837.4
|
|
|
|
|
911.8
|
|
|
|
|
|
$ 837.4
|
$ 911.8
|
|
|
|
Deferred Tax Liabilities |
(2,198.9)
|
|
|
|
|
(2,190.0)
|
|
|
|
|
|
(2,198.9)
|
(2,190.0)
|
|
|
|
Property Related Temporary Differences |
(521.6)
|
|
|
|
|
(418.7)
|
|
|
|
|
|
(521.6)
|
(418.7)
|
|
|
|
Amounts Due from Customers for Future Federal Income Taxes |
(42.7)
|
|
|
|
|
(40.6)
|
|
|
|
|
|
(42.7)
|
(40.6)
|
|
|
|
Deferred State Income Taxes |
(124.8)
|
|
|
|
|
(138.9)
|
|
|
|
|
|
(124.8)
|
(138.9)
|
|
|
|
Regulatory Assets |
(70.2)
|
|
|
|
|
(74.7)
|
|
|
|
|
|
(70.2)
|
(74.7)
|
|
|
|
Deferred Income Taxes on Other Comprehensive Loss |
9.0
|
|
|
|
|
7.7
|
|
|
|
|
|
9.0
|
7.7
|
|
|
|
Accrued Nuclear Decommissioning |
(614.6)
|
|
|
|
|
(611.0)
|
|
|
|
|
|
(614.6)
|
(611.0)
|
|
|
|
All Other, Net |
3.4
|
|
|
|
|
(2.0)
|
|
|
|
|
|
3.4
|
(2.0)
|
|
|
|
Net Deferred Tax Liabilities |
(1,361.5)
|
|
|
|
|
(1,278.2)
|
|
|
|
|
|
(1,361.5)
|
(1,278.2)
|
|
|
|
Summary of Amounts Reported for Interest Expense, Interest Income and Reversal of Prior Period Interest Expense |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Interest Expense |
|
|
|
|
|
|
|
|
|
|
|
0.2
|
0.0
|
$ 0.0
|
|
|
Interest Income |
|
|
|
|
|
|
|
|
|
|
|
0.0
|
0.0
|
0.6
|
|
|
Reversal of Prior Period Interest Expense |
|
|
|
|
|
|
|
|
|
|
|
0.0
|
0.3
|
0.0
|
|
|
Amounts Accrued for Receipt of Interest and Payment of Interest and Penalties |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Accrual for Receipt of Interest |
0.0
|
|
|
|
|
0.0
|
|
|
|
|
|
0.0
|
0.0
|
|
|
|
Accrual for Payment of Interest and Penalties |
0.6
|
|
|
|
|
0.5
|
|
|
|
|
|
0.6
|
0.5
|
|
|
|
Reconciliation of the Beginning and Ending Amount of Unrecognized Tax Benefits |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Balance at January 1, |
|
|
|
|
2.3
|
|
|
|
|
3.2
|
|
2.3
|
3.2
|
15.1
|
|
|
Increase - Tax Positions Taken During a Prior Period |
|
|
|
|
|
|
|
|
|
|
|
0.1
|
1.4
|
0.0
|
|
|
Decrease - Tax Positions Taken During a Prior Period |
|
|
|
|
|
|
|
|
|
|
|
0.0
|
0.0
|
(11.9)
|
|
|
Increase - Tax Positions Taken During the Current Year |
|
|
|
|
|
|
|
|
|
|
|
0.0
|
0.0
|
0.0
|
|
|
Decrease - Tax Positions Taken During the Current Year |
|
|
|
|
|
|
|
|
|
|
|
0.0
|
0.0
|
0.0
|
|
|
Increase - Settlements with Taxing Authorities |
|
|
|
|
|
|
|
|
|
|
|
0.0
|
0.0
|
|
|
|
Decrease - Settlements with Taxing Authorities |
|
|
|
|
|
|
|
|
|
|
|
0.0
|
(0.7)
|
0.0
|
|
|
Decrease - Lapse of the Applicable Statute of Limitations |
|
|
|
|
|
|
|
|
|
|
|
0.0
|
(1.6)
|
0.0
|
|
|
Balance at December 31, |
2.4
|
|
|
|
|
2.3
|
|
|
|
|
|
2.4
|
2.3
|
3.2
|
15.1
|
|
Unrecognized Tax Benefits, if Recognized - Amount |
1.6
|
|
|
|
|
1.6
|
|
|
|
|
|
$ 1.6
|
$ 1.6
|
$ 1.2
|
|
|
Income Taxes (Textuals) [Abstract] |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Statutory Tax Rate on Pretax Income |
|
|
|
|
|
|
|
|
|
|
|
35.00%
|
35.00%
|
35.00%
|
|
|
Federal Net Income Tax Operating Loss |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
$ 123.0
|
Income Tax Expense (Credit) |
|
|
|
|
|
|
|
|
|
|
|
$ 96.1
|
$ 79.6
|
$ 75.1
|
|
|
Net Income (Loss) |
24.9
|
|
56.6
|
50.6
|
72.7
|
14.6
|
|
26.6
|
27.3
|
87.1
|
|
$ 204.8
|
$ 155.6
|
177.5
|
|
|
Period with No Change in Unrecognized Tax Benefits |
|
|
|
|
|
|
|
|
|
|
|
12 months
|
|
|
|
|
Indiana Corporate Income Tax Rate |
|
|
|
|
|
|
|
|
|
|
|
8.50%
|
|
|
|
|
Reduced Indiana Corporate Income Tax Rate |
|
|
|
|
|
|
|
|
|
|
|
6.50%
|
|
|
|
|
Reduction In Indiana Corporate Tax Rate |
|
|
|
|
|
|
|
|
|
|
|
0.50%
|
|
|
|
|
Original WV Corporate Income Tax Rate |
|
|
|
|
|
|
|
|
|
|
|
|
7.00%
|
|
|
|
Reduced WV Corporate Income Tax |
|
|
|
|
|
|
|
|
|
|
|
|
6.50%
|
|
|
|
Ohio Power Co [Member] |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Income Tax Expense: |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Current |
|
|
|
|
|
|
|
|
|
|
|
$ 89.0
|
$ 58.1
|
92.6
|
|
|
Deferred |
|
|
|
|
|
|
|
|
|
|
|
37.6
|
74.4
|
134.5
|
|
|
Deferred Investment Tax Credits |
|
|
|
|
|
|
|
|
|
|
|
(0.1)
|
(0.3)
|
(1.4)
|
|
|
Reconciliation of Federal Income Taxes and Amount of Income Tax Reported |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Net Income |
48.0
|
|
71.6
|
47.7
|
65.4
|
45.0
|
|
54.1
|
56.5
|
60.8
|
|
232.7
|
216.4
|
410.0
|
|
|
Discontinued Operations |
0.0
|
|
0.0
|
0.0
|
0.0
|
0.0
|
|
0.0
|
0.0
|
0.0
|
|
|
|
|
|
|
Income Tax Expense (Credit) |
|
|
|
|
|
|
|
|
|
|
|
126.5
|
132.2
|
225.7
|
|
|
Pretax Income |
|
|
|
|
|
|
|
|
|
|
|
359.2
|
348.6
|
635.7
|
|
|
Income Taxes on Pretax Income at Statutory Rate (35%) |
|
|
|
|
|
|
|
|
|
|
|
125.7
|
122.0
|
222.5
|
|
|
Reconciliation of Federal Statutory Rate and Amount of Taxes Reported |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Depreciation |
|
|
|
|
|
|
|
|
|
|
|
8.2
|
6.7
|
6.8
|
|
|
Investment Tax Credits, Net |
|
|
|
|
|
|
|
|
|
|
|
(0.1)
|
(0.2)
|
(1.4)
|
|
|
State and Local Income Taxes, Net |
|
|
|
|
|
|
|
|
|
|
|
0.7
|
8.8
|
3.3
|
|
|
Other |
|
|
|
|
|
|
|
|
|
|
|
(8.0)
|
(5.1)
|
(5.5)
|
|
|
Income Tax Expense (Credit) |
|
|
|
|
|
|
|
|
|
|
|
$ 126.5
|
$ 132.2
|
$ 225.7
|
|
|
Net Deferred Tax Liability and Significant Temporary Differences |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Effective Income Tax Rate |
|
|
|
|
|
|
|
|
|
|
|
35.21715%
|
37.92312%
|
35.50417%
|
|
|
Deferred Tax Assets |
162.4
|
|
|
|
|
171.8
|
|
|
|
|
|
$ 162.4
|
$ 171.8
|
|
|
|
Deferred Tax Liabilities |
(1,545.6)
|
|
|
|
|
(1,528.1)
|
|
|
|
|
|
(1,545.6)
|
(1,528.1)
|
|
|
|
Property Related Temporary Differences |
(1,022.8)
|
|
|
|
|
(926.5)
|
|
|
|
|
|
(1,022.8)
|
(926.5)
|
|
|
|
Amounts Due from Customers for Future Federal Income Taxes |
(44.6)
|
|
|
|
|
(47.6)
|
|
|
|
|
|
(44.6)
|
(47.6)
|
|
|
|
Deferred State Income Taxes |
(34.4)
|
|
|
|
|
(34.2)
|
|
|
|
|
|
(34.4)
|
(34.2)
|
|
|
|
Regulatory Assets |
(220.0)
|
|
|
|
|
(242.4)
|
|
|
|
|
|
(220.0)
|
(242.4)
|
|
|
|
Deferred Income Taxes on Other Comprehensive Loss |
(2.3)
|
|
|
|
|
(3.0)
|
|
|
|
|
|
(2.3)
|
(3.0)
|
|
|
|
Deferred Fuel and Purchased Power |
(117.4)
|
|
|
|
|
(145.5)
|
|
|
|
|
|
(117.4)
|
(145.5)
|
|
|
|
All Other, Net |
58.3
|
|
|
|
|
42.9
|
|
|
|
|
|
58.3
|
42.9
|
|
|
|
Net Deferred Tax Liabilities |
(1,383.2)
|
|
|
|
|
(1,356.3)
|
|
|
|
|
|
(1,383.2)
|
(1,356.3)
|
|
|
|
Summary of Amounts Reported for Interest Expense, Interest Income and Reversal of Prior Period Interest Expense |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Interest Expense |
|
|
|
|
|
|
|
|
|
|
|
1.0
|
0.1
|
$ 0.0
|
|
|
Interest Income |
|
|
|
|
|
|
|
|
|
|
|
0.0
|
0.0
|
1.9
|
|
|
Reversal of Prior Period Interest Expense |
|
|
|
|
|
|
|
|
|
|
|
0.0
|
0.2
|
0.0
|
|
|
Amounts Accrued for Receipt of Interest and Payment of Interest and Penalties |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Accrual for Receipt of Interest |
0.0
|
|
|
|
|
0.0
|
|
|
|
|
|
0.0
|
0.0
|
|
|
|
Accrual for Payment of Interest and Penalties |
0.6
|
|
|
|
|
0.4
|
|
|
|
|
|
0.6
|
0.4
|
|
|
|
Reconciliation of the Beginning and Ending Amount of Unrecognized Tax Benefits |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Balance at January 1, |
|
|
|
|
6.9
|
|
|
|
|
2.1
|
|
6.9
|
2.1
|
11.1
|
|
|
Increase - Tax Positions Taken During a Prior Period |
|
|
|
|
|
|
|
|
|
|
|
0.0
|
6.4
|
0.0
|
|
|
Decrease - Tax Positions Taken During a Prior Period |
|
|
|
|
|
|
|
|
|
|
|
0.0
|
0.0
|
(9.0)
|
|
|
Increase - Tax Positions Taken During the Current Year |
|
|
|
|
|
|
|
|
|
|
|
0.0
|
0.0
|
0.0
|
|
|
Decrease - Tax Positions Taken During the Current Year |
|
|
|
|
|
|
|
|
|
|
|
0.0
|
0.0
|
0.0
|
|
|
Increase - Settlements with Taxing Authorities |
|
|
|
|
|
|
|
|
|
|
|
0.0
|
0.0
|
|
|
|
Decrease - Settlements with Taxing Authorities |
|
|
|
|
|
|
|
|
|
|
|
0.0
|
0.0
|
0.0
|
|
|
Decrease - Lapse of the Applicable Statute of Limitations |
|
|
|
|
|
|
|
|
|
|
|
0.0
|
(1.6)
|
0.0
|
|
|
Balance at December 31, |
6.9
|
|
|
|
|
6.9
|
|
|
|
|
|
6.9
|
6.9
|
2.1
|
11.1
|
|
Unrecognized Tax Benefits, if Recognized - Amount |
4.5
|
|
|
|
|
4.5
|
|
|
|
|
|
$ 4.5
|
$ 4.5
|
$ 0.7
|
|
|
Income Taxes (Textuals) [Abstract] |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Statutory Tax Rate on Pretax Income |
|
|
|
|
|
|
|
|
|
|
|
35.00%
|
35.00%
|
35.00%
|
|
|
Income Tax Expense (Credit) |
|
|
|
|
|
|
|
|
|
|
|
$ 126.5
|
$ 132.2
|
$ 225.7
|
|
|
Net Income (Loss) |
48.0
|
|
71.6
|
47.7
|
65.4
|
45.0
|
|
54.1
|
56.5
|
60.8
|
|
$ 232.7
|
$ 216.4
|
410.0
|
|
|
Period with No Change in Unrecognized Tax Benefits |
|
|
|
|
|
|
|
|
|
|
|
12 months
|
|
|
|
|
Indiana Corporate Income Tax Rate |
|
|
|
|
|
|
|
|
|
|
|
8.50%
|
|
|
|
|
Reduced Indiana Corporate Income Tax Rate |
|
|
|
|
|
|
|
|
|
|
|
6.50%
|
|
|
|
|
Reduction In Indiana Corporate Tax Rate |
|
|
|
|
|
|
|
|
|
|
|
0.50%
|
|
|
|
|
Original WV Corporate Income Tax Rate |
|
|
|
|
|
|
|
|
|
|
|
|
7.00%
|
|
|
|
Reduced WV Corporate Income Tax |
|
|
|
|
|
|
|
|
|
|
|
|
6.50%
|
|
|
|
Public Service Co Of Oklahoma [Member] |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Income Tax Expense: |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Current |
|
|
|
|
|
|
|
|
|
|
|
$ (6.4)
|
$ (24.2)
|
7.7
|
|
|
Deferred |
|
|
|
|
|
|
|
|
|
|
|
58.3
|
74.7
|
53.8
|
|
|
Deferred Investment Tax Credits |
|
|
|
|
|
|
|
|
|
|
|
(0.6)
|
0.1
|
4.4
|
|
|
Reconciliation of Federal Income Taxes and Amount of Income Tax Reported |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Net Income |
7.0
|
|
44.7
|
27.1
|
13.7
|
10.9
|
|
45.1
|
22.5
|
8.4
|
|
92.5
|
86.9
|
97.8
|
|
|
Discontinued Operations |
0.0
|
|
0.0
|
0.0
|
0.0
|
0.0
|
|
0.0
|
0.0
|
0.0
|
|
|
|
|
|
|
Income Tax Expense (Credit) |
|
|
|
|
|
|
|
|
|
|
|
51.3
|
50.6
|
65.9
|
|
|
Pretax Income |
|
|
|
|
|
|
|
|
|
|
|
143.8
|
137.5
|
163.7
|
|
|
Income Taxes on Pretax Income at Statutory Rate (35%) |
|
|
|
|
|
|
|
|
|
|
|
50.3
|
48.1
|
57.3
|
|
|
Reconciliation of Federal Statutory Rate and Amount of Taxes Reported |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Depreciation |
|
|
|
|
|
|
|
|
|
|
|
0.5
|
0.2
|
0.2
|
|
|
Investment Tax Credits, Net |
|
|
|
|
|
|
|
|
|
|
|
(1.8)
|
(0.8)
|
(0.8)
|
|
|
State and Local Income Taxes, Net |
|
|
|
|
|
|
|
|
|
|
|
5.1
|
4.8
|
5.4
|
|
|
AFUDC |
|
|
|
|
|
|
|
|
|
|
|
(3.1)
|
(1.1)
|
(1.5)
|
|
|
Tax Adjustments |
|
|
|
|
|
|
|
|
|
|
|
(0.3)
|
(1.2)
|
5.3
|
|
|
Other |
|
|
|
|
|
|
|
|
|
|
|
0.6
|
0.6
|
0.0
|
|
|
Income Tax Expense (Credit) |
|
|
|
|
|
|
|
|
|
|
|
$ 51.3
|
$ 50.6
|
$ 65.9
|
|
|
Net Deferred Tax Liability and Significant Temporary Differences |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Effective Income Tax Rate |
|
|
|
|
|
|
|
|
|
|
|
35.67455%
|
36.80%
|
40.25657%
|
|
|
Deferred Tax Assets |
141.2
|
|
|
|
|
110.7
|
|
|
|
|
|
$ 141.2
|
$ 110.7
|
|
|
|
Deferred Tax Liabilities |
(1,113.0)
|
|
|
|
|
(1,016.7)
|
|
|
|
|
|
(1,113.0)
|
(1,016.7)
|
|
|
|
Property Related Temporary Differences |
(861.9)
|
|
|
|
|
(805.2)
|
|
|
|
|
|
(861.9)
|
(805.2)
|
|
|
|
Amounts Due from Customers for Future Federal Income Taxes |
(2.2)
|
|
|
|
|
(0.7)
|
|
|
|
|
|
(2.2)
|
(0.7)
|
|
|
|
Deferred State Income Taxes |
(117.0)
|
|
|
|
|
(109.3)
|
|
|
|
|
|
(117.0)
|
(109.3)
|
|
|
|
Regulatory Assets |
(54.3)
|
|
|
|
|
(39.6)
|
|
|
|
|
|
(54.3)
|
(39.6)
|
|
|
|
Deferred Income Taxes on Other Comprehensive Loss |
(2.3)
|
|
|
|
|
(2.7)
|
|
|
|
|
|
(2.3)
|
(2.7)
|
|
|
|
Deferred Federal Income Taxes on Deferred State Income Taxes |
46.6
|
|
|
|
|
43.9
|
|
|
|
|
|
46.6
|
43.9
|
|
|
|
Net Operating Loss Carryforward |
7.1
|
|
|
|
|
6.4
|
|
|
|
|
|
7.1
|
6.4
|
|
|
|
Tax Credit Carryforward |
0.6
|
|
|
|
|
0.7
|
|
|
|
|
|
0.6
|
0.7
|
|
|
|
All Other, Net |
11.6
|
|
|
|
|
0.5
|
|
|
|
|
|
11.6
|
0.5
|
|
|
|
Net Deferred Tax Liabilities |
(971.8)
|
|
|
|
|
(906.0)
|
|
|
|
|
|
(971.8)
|
(906.0)
|
|
|
|
Summary of Amounts Reported for Interest Expense, Interest Income and Reversal of Prior Period Interest Expense |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Interest Expense |
|
|
|
|
|
|
|
|
|
|
|
0.1
|
0.1
|
$ 0.0
|
|
|
Interest Income |
|
|
|
|
|
|
|
|
|
|
|
0.0
|
0.0
|
0.1
|
|
|
Reversal of Prior Period Interest Expense |
|
|
|
|
|
|
|
|
|
|
|
0.0
|
0.1
|
0.0
|
|
|
Amounts Accrued for Receipt of Interest and Payment of Interest and Penalties |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Accrual for Receipt of Interest |
0.0
|
|
|
|
|
0.0
|
|
|
|
|
|
0.0
|
0.0
|
|
|
|
Accrual for Payment of Interest and Penalties |
0.4
|
|
|
|
|
0.3
|
|
|
|
|
|
0.4
|
0.3
|
|
|
|
Reconciliation of the Beginning and Ending Amount of Unrecognized Tax Benefits |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Balance at January 1, |
|
|
|
|
1.3
|
|
|
|
|
2.2
|
|
1.3
|
2.2
|
2.3
|
|
|
Increase - Tax Positions Taken During a Prior Period |
|
|
|
|
|
|
|
|
|
|
|
0.0
|
0.0
|
0.0
|
|
|
Decrease - Tax Positions Taken During a Prior Period |
|
|
|
|
|
|
|
|
|
|
|
0.0
|
0.0
|
(0.1)
|
|
|
Increase - Tax Positions Taken During the Current Year |
|
|
|
|
|
|
|
|
|
|
|
0.0
|
0.0
|
0.0
|
|
|
Decrease - Tax Positions Taken During the Current Year |
|
|
|
|
|
|
|
|
|
|
|
0.0
|
0.0
|
0.0
|
|
|
Increase - Settlements with Taxing Authorities |
|
|
|
|
|
|
|
|
|
|
|
0.0
|
0.0
|
|
|
|
Decrease - Settlements with Taxing Authorities |
|
|
|
|
|
|
|
|
|
|
|
0.0
|
0.0
|
0.0
|
|
|
Decrease - Lapse of the Applicable Statute of Limitations |
|
|
|
|
|
|
|
|
|
|
|
0.0
|
(0.9)
|
0.0
|
|
|
Balance at December 31, |
1.3
|
|
|
|
|
1.3
|
|
|
|
|
|
1.3
|
1.3
|
2.2
|
2.3
|
|
Unrecognized Tax Benefits, if Recognized - Amount |
0.9
|
|
|
|
|
0.9
|
|
|
|
|
|
$ 0.9
|
$ 0.9
|
$ 0.8
|
|
|
Income Taxes (Textuals) [Abstract] |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Statutory Tax Rate on Pretax Income |
|
|
|
|
|
|
|
|
|
|
|
35.00%
|
35.00%
|
35.00%
|
|
|
Income Tax Expense (Credit) |
|
|
|
|
|
|
|
|
|
|
|
$ 51.3
|
$ 50.6
|
$ 65.9
|
|
|
Net Income (Loss) |
7.0
|
|
44.7
|
27.1
|
13.7
|
10.9
|
|
45.1
|
22.5
|
8.4
|
|
$ 92.5
|
86.9
|
97.8
|
|
|
Period with No Change in Unrecognized Tax Benefits |
|
|
|
|
|
|
|
|
|
|
|
12 months
|
|
|
|
|
Pre-2016 TX Income/Franchise Tax Rate |
|
|
|
|
|
|
|
|
|
|
|
0.95%
|
|
|
|
|
New TX Income/Franchise Tax Rate |
|
|
|
|
|
|
|
|
|
|
|
0.75%
|
|
|
|
|
Anticipated TX Income/Franchise Tax Rate |
|
|
|
|
|
|
|
|
|
|
|
1.00%
|
|
|
|
|
Southwestern Electric Power Co [Member] |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Income Tax Expense: |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Current |
|
|
|
|
|
|
|
|
|
|
|
$ 44.3
|
(171.6)
|
(10.9)
|
|
|
Deferred |
|
|
|
|
|
|
|
|
|
|
|
41.9
|
239.4
|
81.9
|
|
|
Deferred Investment Tax Credits |
|
|
|
|
|
|
|
|
|
|
|
(1.4)
|
(1.4)
|
(1.5)
|
|
|
Reconciliation of Federal Income Taxes and Amount of Income Tax Reported |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Net Income |
7.7
|
|
82.1
|
59.5
|
46.7
|
14.2
|
|
74.6
|
32.8
|
23.0
|
|
196.0
|
144.6
|
153.8
|
|
|
Discontinued Operations |
0.0
|
|
0.0
|
0.0
|
0.0
|
0.0
|
|
0.0
|
0.0
|
0.0
|
|
|
|
|
|
|
Income Tax Expense (Credit) |
|
|
|
|
|
|
|
|
|
|
|
84.8
|
66.4
|
69.5
|
|
|
Pretax Income |
|
|
|
|
|
|
|
|
|
|
|
280.8
|
211.0
|
223.3
|
|
|
Income Taxes on Pretax Income at Statutory Rate (35%) |
|
|
|
|
|
|
|
|
|
|
|
98.3
|
73.8
|
78.1
|
|
|
Reconciliation of Federal Statutory Rate and Amount of Taxes Reported |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Depreciation |
|
|
|
|
|
|
|
|
|
|
|
3.1
|
2.9
|
3.1
|
|
|
Depletion |
|
|
|
|
|
|
|
|
|
|
|
(5.5)
|
(4.1)
|
(3.5)
|
|
|
Investment Tax Credits, Net |
|
|
|
|
|
|
|
|
|
|
|
(1.4)
|
(1.4)
|
(1.5)
|
|
|
State and Local Income Taxes, Net |
|
|
|
|
|
|
|
|
|
|
|
4.8
|
3.1
|
(1.4)
|
|
|
AFUDC |
|
|
|
|
|
|
|
|
|
|
|
(9.2)
|
(4.2)
|
(2.4)
|
|
|
Other |
|
|
|
|
|
|
|
|
|
|
|
(5.3)
|
(3.7)
|
(2.9)
|
|
|
Income Tax Expense (Credit) |
|
|
|
|
|
|
|
|
|
|
|
$ 84.8
|
$ 66.4
|
$ 69.5
|
|
|
Net Deferred Tax Liability and Significant Temporary Differences |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Effective Income Tax Rate |
|
|
|
|
|
|
|
|
|
|
|
30.19943%
|
31.46919%
|
31.12405%
|
|
|
Deferred Tax Assets |
194.7
|
|
|
|
|
186.1
|
|
|
|
|
|
$ 194.7
|
$ 186.1
|
|
|
|
Deferred Tax Liabilities |
(1,594.5)
|
|
|
|
|
(1,528.2)
|
|
|
|
|
|
(1,594.5)
|
(1,528.2)
|
|
|
|
Property Related Temporary Differences |
(1,275.1)
|
|
|
|
|
(1,235.1)
|
|
|
|
|
|
(1,275.1)
|
(1,235.1)
|
|
|
|
Amounts Due from Customers for Future Federal Income Taxes |
(47.8)
|
|
|
|
|
(44.1)
|
|
|
|
|
|
(47.8)
|
(44.1)
|
|
|
|
Deferred State Income Taxes |
(132.3)
|
|
|
|
|
(124.1)
|
|
|
|
|
|
(132.3)
|
(124.1)
|
|
|
|
Regulatory Assets |
(26.1)
|
|
|
|
|
(19.4)
|
|
|
|
|
|
(26.1)
|
(19.4)
|
|
|
|
Deferred Income Taxes on Other Comprehensive Loss |
5.0
|
|
|
|
|
4.0
|
|
|
|
|
|
5.0
|
4.0
|
|
|
|
Impairment Loss |
20.7
|
|
|
|
|
21.1
|
|
|
|
|
|
20.7
|
21.1
|
|
|
|
Net Operating Loss Carryforward |
19.7
|
|
|
|
|
21.9
|
|
|
|
|
|
19.7
|
21.9
|
|
|
|
All Other, Net |
36.1
|
|
|
|
|
33.6
|
|
|
|
|
|
36.1
|
33.6
|
|
|
|
Net Deferred Tax Liabilities |
(1,399.8)
|
|
|
|
|
(1,342.1)
|
|
|
|
|
|
(1,399.8)
|
(1,342.1)
|
|
|
|
Summary of Amounts Reported for Interest Expense, Interest Income and Reversal of Prior Period Interest Expense |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Interest Expense |
|
|
|
|
|
|
|
|
|
|
|
0.4
|
0.2
|
$ 0.2
|
|
|
Interest Income |
|
|
|
|
|
|
|
|
|
|
|
0.0
|
0.0
|
0.0
|
|
|
Reversal of Prior Period Interest Expense |
|
|
|
|
|
|
|
|
|
|
|
0.0
|
0.2
|
0.0
|
|
|
Amounts Accrued for Receipt of Interest and Payment of Interest and Penalties |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Accrual for Receipt of Interest |
0.0
|
|
|
|
|
0.0
|
|
|
|
|
|
0.0
|
0.0
|
|
|
|
Accrual for Payment of Interest and Penalties |
1.4
|
|
|
|
|
1.0
|
|
|
|
|
|
1.4
|
1.0
|
|
|
|
Reconciliation of the Beginning and Ending Amount of Unrecognized Tax Benefits |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Balance at January 1, |
|
|
|
|
7.5
|
|
|
|
|
7.6
|
|
7.5
|
7.6
|
9.5
|
|
|
Increase - Tax Positions Taken During a Prior Period |
|
|
|
|
|
|
|
|
|
|
|
1.8
|
1.6
|
0.0
|
|
|
Decrease - Tax Positions Taken During a Prior Period |
|
|
|
|
|
|
|
|
|
|
|
0.0
|
(0.8)
|
(3.2)
|
|
|
Increase - Tax Positions Taken During the Current Year |
|
|
|
|
|
|
|
|
|
|
|
0.0
|
0.0
|
1.3
|
|
|
Decrease - Tax Positions Taken During the Current Year |
|
|
|
|
|
|
|
|
|
|
|
0.0
|
0.0
|
0.0
|
|
|
Increase - Settlements with Taxing Authorities |
|
|
|
|
|
|
|
|
|
|
|
0.0
|
0.0
|
|
|
|
Decrease - Settlements with Taxing Authorities |
|
|
|
|
|
|
|
|
|
|
|
0.0
|
0.0
|
0.0
|
|
|
Decrease - Lapse of the Applicable Statute of Limitations |
|
|
|
|
|
|
|
|
|
|
|
0.0
|
(0.9)
|
0.0
|
|
|
Balance at December 31, |
9.3
|
|
|
|
|
7.5
|
|
|
|
|
|
9.3
|
7.5
|
7.6
|
9.5
|
|
Unrecognized Tax Benefits, if Recognized - Amount |
6.0
|
|
|
|
|
4.9
|
|
|
|
|
|
$ 6.0
|
$ 4.9
|
$ 4.4
|
|
|
Income Taxes (Textuals) [Abstract] |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Statutory Tax Rate on Pretax Income |
|
|
|
|
|
|
|
|
|
|
|
35.00%
|
35.00%
|
35.00%
|
|
|
Federal Net Income Tax Operating Loss |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
$ 858.0
|
|
Income Tax Expense (Credit) |
|
|
|
|
|
|
|
|
|
|
|
$ 84.8
|
$ 66.4
|
$ 69.5
|
|
|
Net Income (Loss) |
7.7
|
|
$ 82.1
|
$ 59.5
|
$ 46.7
|
14.2
|
|
$ 74.6
|
$ 32.8
|
$ 23.0
|
|
$ 196.0
|
144.6
|
153.8
|
|
|
Period with No Change in Unrecognized Tax Benefits |
|
|
|
|
|
|
|
|
|
|
|
12 months
|
|
|
|
|
Pre-2016 TX Income/Franchise Tax Rate |
|
|
|
|
|
|
|
|
|
|
|
0.95%
|
|
|
|
|
New TX Income/Franchise Tax Rate |
|
|
|
|
|
|
|
|
|
|
|
0.75%
|
|
|
|
|
Anticipated TX Income/Franchise Tax Rate |
|
|
|
|
|
|
|
|
|
|
|
1.00%
|
|
|
|
|
Kentucky [Member] |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Net Income Tax Operating Loss Carryforwards |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Net Income Tax Operating Loss Carryforward |
80.7
|
|
|
|
|
|
|
|
|
|
|
$ 80.7
|
|
|
|
|
Operating Loss Carryforwards, Expiration Date |
|
|
|
|
|
|
|
|
|
|
|
Dec. 31, 2035
|
|
|
|
|
Louisiana [Member] |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Net Income Tax Operating Loss Carryforwards |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Net Income Tax Operating Loss Carryforward |
376.3
|
|
|
|
|
|
|
|
|
|
|
$ 376.3
|
|
|
|
|
Operating Loss Carryforwards, Expiration Date |
|
|
|
|
|
|
|
|
|
|
|
Dec. 31, 2030
|
|
|
|
|
Louisiana [Member] | Southwestern Electric Power Co [Member] |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Net Income Tax Operating Loss Carryforwards |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Net Income Tax Operating Loss Carryforward |
375.7
|
|
|
|
|
|
|
|
|
|
|
$ 375.7
|
|
|
|
|
Operating Loss Carryforwards, Expiration Date |
|
|
|
|
|
|
|
|
|
|
|
Dec. 31, 2030
|
|
|
|
|
Oklahoma [Member] |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Net Income Tax Operating Loss Carryforwards |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Net Income Tax Operating Loss Carryforward |
378.1
|
|
|
|
|
|
|
|
|
|
|
$ 378.1
|
|
|
|
|
Operating Loss Carryforwards, Expiration Date |
|
|
|
|
|
|
|
|
|
|
|
Dec. 31, 2035
|
|
|
|
|
Oklahoma [Member] | Public Service Co Of Oklahoma [Member] |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Net Income Tax Operating Loss Carryforwards |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Net Income Tax Operating Loss Carryforward |
181.8
|
|
|
|
|
|
|
|
|
|
|
$ 181.8
|
|
|
|
|
Operating Loss Carryforwards, Expiration Date |
|
|
|
|
|
|
|
|
|
|
|
Dec. 31, 2035
|
|
|
|
|
Oklahoma [Member] | Southwestern Electric Power Co [Member] |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Net Income Tax Operating Loss Carryforwards |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Net Income Tax Operating Loss Carryforward |
3.2
|
|
|
|
|
|
|
|
|
|
|
$ 3.2
|
|
|
|
|
Operating Loss Carryforwards, Expiration Date |
|
|
|
|
|
|
|
|
|
|
|
Dec. 31, 2035
|
|
|
|
|
West Virginia [Member] |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Net Income Tax Operating Loss Carryforwards |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Net Income Tax Operating Loss Carryforward |
49.9
|
|
|
|
|
|
|
|
|
|
|
$ 49.9
|
|
|
|
|
Operating Loss Carryforwards, Expiration Date |
|
|
|
|
|
|
|
|
|
|
|
Dec. 31, 2033
|
|
|
|
|
West Virginia [Member] | Appalachian Power Co [Member] |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Net Income Tax Operating Loss Carryforwards |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Net Income Tax Operating Loss Carryforward |
24.8
|
|
|
|
|
|
|
|
|
|
|
$ 24.8
|
|
|
|
|
Operating Loss Carryforwards, Expiration Date |
|
|
|
|
|
|
|
|
|
|
|
Dec. 31, 2033
|
|
|
|
|
West Virginia [Member] | Ohio Power Co [Member] |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Net Income Tax Operating Loss Carryforwards |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Net Income Tax Operating Loss Carryforward |
25.2
|
|
|
|
|
|
|
|
|
|
|
$ 25.2
|
|
|
|
|
Operating Loss Carryforwards, Expiration Date |
|
|
|
|
|
|
|
|
|
|
|
Dec. 31, 2033
|
|
|
|
|
Federal [Member] |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Net Income Tax Operating Loss Carryforwards |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Net Income Tax Operating Loss Carryforward |
|
|
|
|
|
|
|
|
|
|
|
|
|
156.0
|
|
|
Tax Credit Carryforward |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Tax Credit Carryforward, Amount |
85.0
|
|
|
|
|
|
|
|
|
|
|
$ 85.0
|
|
|
|
|
Tax Credit Carryforward Amount To Expire If Not Used |
47.8
|
|
|
|
|
|
|
|
|
|
|
47.8
|
|
|
|
|
Income Taxes (Textuals) [Abstract] |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Uncertain Tax Positions Netted Against Operating Loss Carryforward |
|
|
|
|
|
|
|
|
|
|
|
|
|
121.0
|
|
|
Uncertain Tax Position Noncurrent |
|
|
|
|
|
69.0
|
|
|
|
|
|
|
69.0
|
|
|
|
Uncertain Tax Positions Netted Against Tax Credit and Alternative Minimum Tax Carryforward Tax Benefits |
59.0
|
|
|
|
|
$ 52.0
|
|
|
|
|
|
$ 59.0
|
$ 52.0
|
|
|
|
Federal [Member] | Maximum [Member] |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Income Taxes (Textuals) [Abstract] |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Tax Credit Carryforward, Expiration Date |
|
|
|
|
|
|
|
|
|
|
|
Dec. 31, 2035
|
|
|
|
|
Federal [Member] | Minimum [Member] |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Income Taxes (Textuals) [Abstract] |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Tax Credit Carryforward, Expiration Date |
|
|
|
|
|
|
|
|
|
|
|
Jan. 01, 2030
|
|
|
|
|
Federal [Member] | Appalachian Power Co [Member] |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Net Income Tax Operating Loss Carryforwards |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Net Income Tax Operating Loss Carryforward |
|
|
|
|
|
|
|
|
|
|
|
|
|
12.0
|
|
|
Tax Credit Carryforward |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Tax Credit Carryforward, Amount |
19.1
|
|
|
|
|
|
|
|
|
|
|
$ 19.1
|
|
|
|
|
Tax Credit Carryforward Amount To Expire If Not Used |
5.8
|
|
|
|
|
|
|
|
|
|
|
$ 5.8
|
|
|
|
|
Federal [Member] | Appalachian Power Co [Member] | Maximum [Member] |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Income Taxes (Textuals) [Abstract] |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Tax Credit Carryforward, Expiration Date |
|
|
|
|
|
|
|
|
|
|
|
Dec. 31, 2035
|
|
|
|
|
Federal [Member] | Appalachian Power Co [Member] | Minimum [Member] |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Income Taxes (Textuals) [Abstract] |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Tax Credit Carryforward, Expiration Date |
|
|
|
|
|
|
|
|
|
|
|
Jan. 01, 2030
|
|
|
|
|
Federal [Member] | Indiana Michigan Power Co [Member] |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Net Income Tax Operating Loss Carryforwards |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Net Income Tax Operating Loss Carryforward |
|
|
|
|
|
|
|
|
|
|
|
|
|
13.0
|
|
|
Tax Credit Carryforward |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Tax Credit Carryforward, Amount |
3.7
|
|
|
|
|
|
|
|
|
|
|
$ 3.7
|
|
|
|
|
Tax Credit Carryforward Amount To Expire If Not Used |
3.2
|
|
|
|
|
|
|
|
|
|
|
$ 3.2
|
|
|
|
|
Federal [Member] | Indiana Michigan Power Co [Member] | Maximum [Member] |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Income Taxes (Textuals) [Abstract] |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Tax Credit Carryforward, Expiration Date |
|
|
|
|
|
|
|
|
|
|
|
Dec. 31, 2035
|
|
|
|
|
Federal [Member] | Indiana Michigan Power Co [Member] | Minimum [Member] |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Income Taxes (Textuals) [Abstract] |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Tax Credit Carryforward, Expiration Date |
|
|
|
|
|
|
|
|
|
|
|
Jan. 01, 2030
|
|
|
|
|
Federal [Member] | Ohio Power Co [Member] |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Tax Credit Carryforward |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Tax Credit Carryforward, Amount |
19.3
|
|
|
|
|
|
|
|
|
|
|
$ 19.3
|
|
|
|
|
Tax Credit Carryforward Amount To Expire If Not Used |
1.0
|
|
|
|
|
|
|
|
|
|
|
$ 1.0
|
|
|
|
|
Federal [Member] | Ohio Power Co [Member] | Maximum [Member] |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Income Taxes (Textuals) [Abstract] |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Tax Credit Carryforward, Expiration Date |
|
|
|
|
|
|
|
|
|
|
|
Dec. 31, 2035
|
|
|
|
|
Federal [Member] | Ohio Power Co [Member] | Minimum [Member] |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Income Taxes (Textuals) [Abstract] |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Tax Credit Carryforward, Expiration Date |
|
|
|
|
|
|
|
|
|
|
|
Jan. 01, 2030
|
|
|
|
|
Federal [Member] | Public Service Co Of Oklahoma [Member] |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Tax Credit Carryforward |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Tax Credit Carryforward, Amount |
0.6
|
|
|
|
|
|
|
|
|
|
|
$ 0.6
|
|
|
|
|
Tax Credit Carryforward Amount To Expire If Not Used |
0.6
|
|
|
|
|
|
|
|
|
|
|
$ 0.6
|
|
|
|
|
Federal [Member] | Public Service Co Of Oklahoma [Member] | Maximum [Member] |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Income Taxes (Textuals) [Abstract] |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Tax Credit Carryforward, Expiration Date |
|
|
|
|
|
|
|
|
|
|
|
Dec. 31, 2035
|
|
|
|
|
Federal [Member] | Public Service Co Of Oklahoma [Member] | Minimum [Member] |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Income Taxes (Textuals) [Abstract] |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Tax Credit Carryforward, Expiration Date |
|
|
|
|
|
|
|
|
|
|
|
Jan. 01, 2030
|
|
|
|
|
Federal [Member] | Southwestern Electric Power Co [Member] |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Net Income Tax Operating Loss Carryforwards |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Net Income Tax Operating Loss Carryforward |
|
|
|
|
|
|
|
|
|
|
|
|
|
167.0
|
|
|
Tax Credit Carryforward |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Tax Credit Carryforward, Amount |
0.7
|
|
|
|
|
|
|
|
|
|
|
$ 0.7
|
|
|
|
|
Tax Credit Carryforward Amount To Expire If Not Used |
0.6
|
|
|
|
|
|
|
|
|
|
|
$ 0.6
|
|
|
|
|
Federal [Member] | Southwestern Electric Power Co [Member] | Maximum [Member] |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Income Taxes (Textuals) [Abstract] |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Tax Credit Carryforward, Expiration Date |
|
|
|
|
|
|
|
|
|
|
|
Dec. 31, 2035
|
|
|
|
|
Federal [Member] | Southwestern Electric Power Co [Member] | Minimum [Member] |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Income Taxes (Textuals) [Abstract] |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Tax Credit Carryforward, Expiration Date |
|
|
|
|
|
|
|
|
|
|
|
Jan. 01, 2030
|
|
|
|
|
State [Member] |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Tax Credit Carryforward |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Tax Credit Carryforward, Amount |
23.4
|
|
|
|
|
|
|
|
|
|
|
$ 23.4
|
|
|
|
|
Tax Credit Carryforward Amount To Expire If Not Used |
23.4
|
|
|
|
|
|
|
|
|
|
|
23.4
|
|
|
|
|
State [Member] | Appalachian Power Co [Member] |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Tax Credit Carryforward |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Tax Credit Carryforward, Amount |
0.0
|
|
|
|
|
|
|
|
|
|
|
0.0
|
|
|
|
|
Tax Credit Carryforward Amount To Expire If Not Used |
0.0
|
|
|
|
|
|
|
|
|
|
|
0.0
|
|
|
|
|
State [Member] | Indiana Michigan Power Co [Member] |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Tax Credit Carryforward |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Tax Credit Carryforward, Amount |
0.0
|
|
|
|
|
|
|
|
|
|
|
0.0
|
|
|
|
|
Tax Credit Carryforward Amount To Expire If Not Used |
0.0
|
|
|
|
|
|
|
|
|
|
|
0.0
|
|
|
|
|
State [Member] | Ohio Power Co [Member] |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Tax Credit Carryforward |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Tax Credit Carryforward, Amount |
0.0
|
|
|
|
|
|
|
|
|
|
|
0.0
|
|
|
|
|
Tax Credit Carryforward Amount To Expire If Not Used |
0.0
|
|
|
|
|
|
|
|
|
|
|
0.0
|
|
|
|
|
State [Member] | Public Service Co Of Oklahoma [Member] |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Tax Credit Carryforward |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Tax Credit Carryforward, Amount |
23.4
|
|
|
|
|
|
|
|
|
|
|
23.4
|
|
|
|
|
Tax Credit Carryforward Amount To Expire If Not Used |
23.4
|
|
|
|
|
|
|
|
|
|
|
23.4
|
|
|
|
|
State [Member] | Southwestern Electric Power Co [Member] |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Tax Credit Carryforward |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Tax Credit Carryforward, Amount |
0.0
|
|
|
|
|
|
|
|
|
|
|
0.0
|
|
|
|
|
Tax Credit Carryforward Amount To Expire If Not Used |
$ 0.0
|
|
|
|
|
|
|
|
|
|
|
$ 0.0
|
|
|
|
|
Uk Windfall Tax Issue [Member] |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Reconciliation of Federal Income Taxes and Amount of Income Tax Reported |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Net Income |
|
|
|
|
|
|
|
|
|
|
|
|
|
108.0
|
|
|
Income Tax Expense (Credit) |
|
|
|
|
|
|
|
|
|
|
$ 80.0
|
|
|
|
|
|
Reconciliation of Federal Statutory Rate and Amount of Taxes Reported |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Income Tax Expense (Credit) |
|
|
|
|
|
|
|
|
|
|
80.0
|
|
|
|
|
|
Income Taxes (Textuals) [Abstract] |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Income Tax Expense (Credit) |
|
|
|
|
|
|
|
|
|
|
80.0
|
|
|
|
|
|
Interest Income |
|
|
|
|
|
|
|
|
|
|
$ 43.0
|
|
|
|
|
|
Net Income (Loss) |
|
|
|
|
|
|
|
|
|
|
|
|
|
$ 108.0
|
|
|
American Taxpayer Relief Act Of 2012 [Member] |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Income Taxes (Textuals) [Abstract] |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Bonus Depreciation Extension |
|
|
|
|
|
|
|
|
|
|
|
|
|
50.00%
|
|
|
American Taxpayer Relief Act Of 2012 [Member] | Appalachian Power Co [Member] |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Income Taxes (Textuals) [Abstract] |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Bonus Depreciation Extension |
|
|
|
|
|
|
|
|
|
|
|
|
|
50.00%
|
|
|
American Taxpayer Relief Act Of 2012 [Member] | Indiana Michigan Power Co [Member] |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Income Taxes (Textuals) [Abstract] |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Bonus Depreciation Extension |
|
|
|
|
|
|
|
|
|
|
|
|
|
50.00%
|
|
|
American Taxpayer Relief Act Of 2012 [Member] | Ohio Power Co [Member] |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Income Taxes (Textuals) [Abstract] |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Bonus Depreciation Extension |
|
|
|
|
|
|
|
|
|
|
|
|
|
50.00%
|
|
|
American Taxpayer Relief Act Of 2012 [Member] | Public Service Co Of Oklahoma [Member] |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Income Taxes (Textuals) [Abstract] |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Bonus Depreciation Extension |
|
|
|
|
|
|
|
|
|
|
|
|
|
50.00%
|
|
|
American Taxpayer Relief Act Of 2012 [Member] | Southwestern Electric Power Co [Member] |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Income Taxes (Textuals) [Abstract] |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Bonus Depreciation Extension |
|
|
|
|
|
|
|
|
|
|
|
|
|
50.00%
|
|
|
Tax Increase Prevention Act of 2014 [Member] |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Income Taxes (Textuals) [Abstract] |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Bonus Depreciation Extension |
|
|
|
|
|
|
|
|
|
|
|
50.00%
|
|
|
|
|
Tax Increase Prevention Act of 2014 [Member] | Appalachian Power Co [Member] |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Income Taxes (Textuals) [Abstract] |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Bonus Depreciation Extension |
|
|
|
|
|
|
|
|
|
|
|
50.00%
|
|
|
|
|
Tax Increase Prevention Act of 2014 [Member] | Indiana Michigan Power Co [Member] |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Income Taxes (Textuals) [Abstract] |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Bonus Depreciation Extension |
|
|
|
|
|
|
|
|
|
|
|
50.00%
|
|
|
|
|
Tax Increase Prevention Act of 2014 [Member] | Ohio Power Co [Member] |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Income Taxes (Textuals) [Abstract] |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Bonus Depreciation Extension |
|
|
|
|
|
|
|
|
|
|
|
50.00%
|
|
|
|
|
Tax Increase Prevention Act of 2014 [Member] | Public Service Co Of Oklahoma [Member] |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Income Taxes (Textuals) [Abstract] |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Bonus Depreciation Extension |
|
|
|
|
|
|
|
|
|
|
|
50.00%
|
|
|
|
|
Tax Increase Prevention Act of 2014 [Member] | Southwestern Electric Power Co [Member] |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Income Taxes (Textuals) [Abstract] |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Bonus Depreciation Extension |
|
|
|
|
|
|
|
|
|
|
|
50.00%
|
|
|
|
|
Protecting Americans from Tax Hikes Act of 2015 [Member] |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Income Taxes (Textuals) [Abstract] |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Bonus Depreciation Extension |
|
|
|
|
|
|
|
|
|
|
|
50.00%
|
|
|
|
|
Bonus Depreciation Extension Phase Down 40 |
|
|
|
|
|
|
|
|
|
|
|
40.00%
|
|
|
|
|
Bonus Depreciation Extension Phase Down 30 |
|
|
|
|
|
|
|
|
|
|
|
30.00%
|
|
|
|
|
Solar Investment Tax Credit |
|
|
|
|
|
|
|
|
|
|
|
30.00%
|
|
|
|
|
Protecting Americans from Tax Hikes Act of 2015 [Member] | Appalachian Power Co [Member] |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Income Taxes (Textuals) [Abstract] |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Bonus Depreciation Extension |
|
|
|
|
|
|
|
|
|
|
|
50.00%
|
|
|
|
|
Bonus Depreciation Extension Phase Down 40 |
|
|
|
|
|
|
|
|
|
|
|
40.00%
|
|
|
|
|
Bonus Depreciation Extension Phase Down 30 |
|
|
|
|
|
|
|
|
|
|
|
30.00%
|
|
|
|
|
Solar Investment Tax Credit |
|
|
|
|
|
|
|
|
|
|
|
30.00%
|
|
|
|
|
Protecting Americans from Tax Hikes Act of 2015 [Member] | Indiana Michigan Power Co [Member] |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Income Taxes (Textuals) [Abstract] |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Bonus Depreciation Extension |
|
|
|
|
|
|
|
|
|
|
|
50.00%
|
|
|
|
|
Bonus Depreciation Extension Phase Down 40 |
|
|
|
|
|
|
|
|
|
|
|
40.00%
|
|
|
|
|
Bonus Depreciation Extension Phase Down 30 |
|
|
|
|
|
|
|
|
|
|
|
30.00%
|
|
|
|
|
Solar Investment Tax Credit |
|
|
|
|
|
|
|
|
|
|
|
30.00%
|
|
|
|
|
Protecting Americans from Tax Hikes Act of 2015 [Member] | Ohio Power Co [Member] |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Income Taxes (Textuals) [Abstract] |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Bonus Depreciation Extension |
|
|
|
|
|
|
|
|
|
|
|
50.00%
|
|
|
|
|
Bonus Depreciation Extension Phase Down 40 |
|
|
|
|
|
|
|
|
|
|
|
40.00%
|
|
|
|
|
Bonus Depreciation Extension Phase Down 30 |
|
|
|
|
|
|
|
|
|
|
|
30.00%
|
|
|
|
|
Solar Investment Tax Credit |
|
|
|
|
|
|
|
|
|
|
|
30.00%
|
|
|
|
|
Protecting Americans from Tax Hikes Act of 2015 [Member] | Public Service Co Of Oklahoma [Member] |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Income Taxes (Textuals) [Abstract] |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Bonus Depreciation Extension |
|
|
|
|
|
|
|
|
|
|
|
50.00%
|
|
|
|
|
Bonus Depreciation Extension Phase Down 40 |
|
|
|
|
|
|
|
|
|
|
|
40.00%
|
|
|
|
|
Bonus Depreciation Extension Phase Down 30 |
|
|
|
|
|
|
|
|
|
|
|
30.00%
|
|
|
|
|
Solar Investment Tax Credit |
|
|
|
|
|
|
|
|
|
|
|
30.00%
|
|
|
|
|
Protecting Americans from Tax Hikes Act of 2015 [Member] | Southwestern Electric Power Co [Member] |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Income Taxes (Textuals) [Abstract] |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Bonus Depreciation Extension |
|
|
|
|
|
|
|
|
|
|
|
50.00%
|
|
|
|
|
Bonus Depreciation Extension Phase Down 40 |
|
|
|
|
|
|
|
|
|
|
|
40.00%
|
|
|
|
|
Bonus Depreciation Extension Phase Down 30 |
|
|
|
|
|
|
|
|
|
|
|
30.00%
|
|
|
|
|
Solar Investment Tax Credit |
|
|
|
|
|
|
|
|
|
|
|
30.00%
|
|
|
|
|
Net Tax Benefit [Member] |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Income Taxes (Textuals) [Abstract] |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Discontinued Operations |
|
|
|
|
|
|
|
|
|
|
|
$ 6.2
|
|
|
|
|
|
|