Comprehensive Income (Details) - USD ($) $ in Millions |
12 Months Ended |
Dec. 31, 2021 |
Dec. 31, 2020 |
Dec. 31, 2019 |
Changes in Accumulated Other Comprehensive Income (Loss) by Component |
|
|
|
|
Beginning Balance in AOCI |
|
$ (85.1)
|
$ (147.7)
|
$ (120.4)
|
Change in Fair Value Recognized in AOCI |
|
536.8
|
(66.4)
|
(69.7)
|
Commodity |
|
|
|
|
Generation and Marketing Revenues |
|
16,792.0
|
14,918.5
|
15,561.4
|
Interest Rate |
|
|
|
|
Interest Expense |
|
1,199.1
|
1,165.7
|
1,072.5
|
Pension and OPEB |
|
|
|
|
Reclassifications from AOCI, before Income Tax (Expense) Benefit |
|
(337.9)
|
163.2
|
53.7
|
Income Tax (Expense) Benefit |
|
115.5
|
40.5
|
(12.9)
|
Reclassifications from AOCI, Net of Income Tax (Expense) Benefit |
|
(266.9)
|
129.0
|
42.4
|
Net Current Period Other Comprehensive Income (Loss) |
|
269.9
|
62.6
|
(27.3)
|
Ending Balance in AOCI |
|
184.8
|
(85.1)
|
(147.7)
|
Pension and OPEB [Member] | Amortization of Deferred Costs [Member] |
|
|
|
|
Changes in Accumulated Other Comprehensive Income (Loss) by Component |
|
|
|
|
Beginning Balance in AOCI |
|
123.7
|
130.7
|
136.3
|
Change in Fair Value Recognized in AOCI |
|
0.0
|
0.0
|
0.0
|
Pension and OPEB |
|
|
|
|
Reclassifications from AOCI, before Income Tax (Expense) Benefit |
|
(10.3)
|
(8.9)
|
(7.1)
|
Reclassifications from AOCI, Net of Income Tax (Expense) Benefit |
|
(8.1)
|
(7.0)
|
(5.6)
|
Net Current Period Other Comprehensive Income (Loss) |
|
(8.1)
|
(7.0)
|
(5.6)
|
Ending Balance in AOCI |
|
115.6
|
123.7
|
130.7
|
Pension and OPEB [Member] | Changes in Funded Status [Member] |
|
|
|
|
Changes in Accumulated Other Comprehensive Income (Loss) by Component |
|
|
|
|
Beginning Balance in AOCI |
|
(100.7)
|
(163.4)
|
(221.1)
|
Change in Fair Value Recognized in AOCI |
|
27.5
|
62.7
|
57.7
|
Pension and OPEB |
|
|
|
|
Reclassifications from AOCI, before Income Tax (Expense) Benefit |
|
0.0
|
0.0
|
0.0
|
Reclassifications from AOCI, Net of Income Tax (Expense) Benefit |
|
0.0
|
0.0
|
0.0
|
Net Current Period Other Comprehensive Income (Loss) |
|
27.5
|
62.7
|
57.7
|
Ending Balance in AOCI |
|
(73.2)
|
(100.7)
|
(163.4)
|
Accumulated Other Comprehensive Income [Member] |
|
|
|
|
Pension and OPEB |
|
|
|
|
Net Current Period Other Comprehensive Income (Loss) |
|
269.9
|
62.6
|
(27.3)
|
Commodity [Member] | Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member] |
|
|
|
|
Changes in Accumulated Other Comprehensive Income (Loss) by Component |
|
|
|
|
Beginning Balance in AOCI |
|
(60.6)
|
(103.5)
|
(23.0)
|
Change in Fair Value Recognized in AOCI |
|
488.2
|
(89.2)
|
(127.2)
|
Pension and OPEB |
|
|
|
|
Reclassifications from AOCI, before Income Tax (Expense) Benefit |
|
(334.1)
|
167.2
|
59.3
|
Reclassifications from AOCI, Net of Income Tax (Expense) Benefit |
|
(263.9)
|
132.1
|
46.7
|
Net Current Period Other Comprehensive Income (Loss) |
|
224.3
|
42.9
|
(80.5)
|
Ending Balance in AOCI |
|
163.7
|
(60.6)
|
(103.5)
|
Interest Rate [Member] | Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member] |
|
|
|
|
Changes in Accumulated Other Comprehensive Income (Loss) by Component |
|
|
|
|
Beginning Balance in AOCI |
|
(47.5)
|
(11.5)
|
(12.6)
|
Change in Fair Value Recognized in AOCI |
[1] |
21.1
|
(39.9)
|
(0.2)
|
Pension and OPEB |
|
|
|
|
Reclassifications from AOCI, before Income Tax (Expense) Benefit |
|
6.5
|
4.9
|
1.5
|
Reclassifications from AOCI, Net of Income Tax (Expense) Benefit |
|
5.1
|
3.9
|
1.3
|
Net Current Period Other Comprehensive Income (Loss) |
|
26.2
|
(36.0)
|
1.1
|
Ending Balance in AOCI |
|
(21.3)
|
(47.5)
|
(11.5)
|
Generation and Marketing Revenues [Member] |
|
|
|
|
Commodity |
|
|
|
|
Generation and Marketing Revenues |
|
2,108.3
|
1,621.0
|
1,721.8
|
Apple Blossom and Black Oak [Member] | Interest Rate [Member] | Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member] |
|
|
|
|
Changes in Accumulated Other Comprehensive Income (Loss) by Component |
|
|
|
|
Change in Fair Value Recognized in AOCI |
|
(7.0)
|
6.0
|
4.0
|
AEP Texas Inc. [Member] |
|
|
|
|
Changes in Accumulated Other Comprehensive Income (Loss) by Component |
|
|
|
|
Beginning Balance in AOCI |
|
(8.9)
|
(12.8)
|
(15.1)
|
Change in Fair Value Recognized in AOCI |
|
1.3
|
2.7
|
1.1
|
Commodity |
|
|
|
|
Generation and Marketing Revenues |
|
1,587.7
|
1,528.0
|
1,551.6
|
Interest Rate |
|
|
|
|
Interest Expense |
|
176.5
|
171.8
|
137.2
|
Pension and OPEB |
|
|
|
|
Reclassifications from AOCI, before Income Tax (Expense) Benefit |
|
1.4
|
1.5
|
1.5
|
Income Tax (Expense) Benefit |
|
43.1
|
(11.2)
|
(53.6)
|
Reclassifications from AOCI, Net of Income Tax (Expense) Benefit |
|
1.1
|
1.2
|
1.2
|
Net Current Period Other Comprehensive Income (Loss) |
|
2.4
|
3.9
|
2.3
|
Ending Balance in AOCI |
|
(6.5)
|
(8.9)
|
(12.8)
|
AEP Texas Inc. [Member] | Pension and OPEB [Member] | Amortization of Deferred Costs [Member] |
|
|
|
|
Changes in Accumulated Other Comprehensive Income (Loss) by Component |
|
|
|
|
Beginning Balance in AOCI |
|
5.1
|
4.9
|
4.7
|
Change in Fair Value Recognized in AOCI |
|
0.0
|
0.0
|
0.0
|
Pension and OPEB |
|
|
|
|
Reclassifications from AOCI, before Income Tax (Expense) Benefit |
|
0.2
|
0.2
|
0.2
|
Reclassifications from AOCI, Net of Income Tax (Expense) Benefit |
|
0.2
|
0.2
|
0.2
|
Net Current Period Other Comprehensive Income (Loss) |
|
0.2
|
0.2
|
0.2
|
Ending Balance in AOCI |
|
5.3
|
5.1
|
4.9
|
AEP Texas Inc. [Member] | Pension and OPEB [Member] | Changes in Funded Status [Member] |
|
|
|
|
Changes in Accumulated Other Comprehensive Income (Loss) by Component |
|
|
|
|
Beginning Balance in AOCI |
|
(11.7)
|
(14.3)
|
(15.4)
|
Change in Fair Value Recognized in AOCI |
|
1.2
|
2.6
|
1.1
|
Pension and OPEB |
|
|
|
|
Reclassifications from AOCI, before Income Tax (Expense) Benefit |
|
0.0
|
0.0
|
0.0
|
Reclassifications from AOCI, Net of Income Tax (Expense) Benefit |
|
0.0
|
0.0
|
0.0
|
Net Current Period Other Comprehensive Income (Loss) |
|
1.2
|
2.6
|
1.1
|
Ending Balance in AOCI |
|
(10.5)
|
(11.7)
|
(14.3)
|
AEP Texas Inc. [Member] | Accumulated Other Comprehensive Income [Member] |
|
|
|
|
Pension and OPEB |
|
|
|
|
Net Current Period Other Comprehensive Income (Loss) |
|
2.4
|
3.9
|
2.3
|
AEP Texas Inc. [Member] | Interest Rate [Member] | Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member] |
|
|
|
|
Changes in Accumulated Other Comprehensive Income (Loss) by Component |
|
|
|
|
Beginning Balance in AOCI |
|
(2.3)
|
(3.4)
|
(4.4)
|
Change in Fair Value Recognized in AOCI |
|
0.1
|
0.1
|
0.0
|
Pension and OPEB |
|
|
|
|
Reclassifications from AOCI, before Income Tax (Expense) Benefit |
|
1.2
|
1.3
|
1.3
|
Reclassifications from AOCI, Net of Income Tax (Expense) Benefit |
|
0.9
|
1.0
|
1.0
|
Net Current Period Other Comprehensive Income (Loss) |
|
1.0
|
1.1
|
1.0
|
Ending Balance in AOCI |
|
(1.3)
|
(2.3)
|
(3.4)
|
Appalachian Power Co [Member] |
|
|
|
|
Changes in Accumulated Other Comprehensive Income (Loss) by Component |
|
|
|
|
Beginning Balance in AOCI |
|
7.2
|
5.0
|
(5.0)
|
Change in Fair Value Recognized in AOCI |
|
22.3
|
7.0
|
13.4
|
Commodity |
|
|
|
|
Generation and Marketing Revenues |
|
3,092.9
|
2,809.2
|
2,911.1
|
Interest Rate |
|
|
|
|
Interest Expense |
|
214.0
|
217.6
|
205.0
|
Pension and OPEB |
|
|
|
|
Reclassifications from AOCI, before Income Tax (Expense) Benefit |
|
(6.4)
|
(6.1)
|
(4.3)
|
Income Tax (Expense) Benefit |
|
22.1
|
4.3
|
(78.0)
|
Reclassifications from AOCI, Net of Income Tax (Expense) Benefit |
|
(5.1)
|
(4.8)
|
(3.4)
|
Net Current Period Other Comprehensive Income (Loss) |
|
17.2
|
2.2
|
10.0
|
Ending Balance in AOCI |
|
24.4
|
7.2
|
5.0
|
Appalachian Power Co [Member] | Pension and OPEB [Member] | Amortization of Deferred Costs [Member] |
|
|
|
|
Changes in Accumulated Other Comprehensive Income (Loss) by Component |
|
|
|
|
Beginning Balance in AOCI |
|
5.4
|
9.2
|
11.7
|
Change in Fair Value Recognized in AOCI |
|
0.0
|
0.0
|
0.0
|
Pension and OPEB |
|
|
|
|
Reclassifications from AOCI, before Income Tax (Expense) Benefit |
|
(5.3)
|
(4.8)
|
(3.2)
|
Reclassifications from AOCI, Net of Income Tax (Expense) Benefit |
|
(4.2)
|
(3.8)
|
(2.5)
|
Net Current Period Other Comprehensive Income (Loss) |
|
(4.2)
|
(3.8)
|
(2.5)
|
Ending Balance in AOCI |
|
1.2
|
5.4
|
9.2
|
Appalachian Power Co [Member] | Pension and OPEB [Member] | Changes in Funded Status [Member] |
|
|
|
|
Changes in Accumulated Other Comprehensive Income (Loss) by Component |
|
|
|
|
Beginning Balance in AOCI |
|
2.6
|
(5.1)
|
(18.5)
|
Change in Fair Value Recognized in AOCI |
|
13.1
|
7.7
|
13.4
|
Pension and OPEB |
|
|
|
|
Reclassifications from AOCI, before Income Tax (Expense) Benefit |
|
0.0
|
0.0
|
0.0
|
Reclassifications from AOCI, Net of Income Tax (Expense) Benefit |
|
0.0
|
0.0
|
0.0
|
Net Current Period Other Comprehensive Income (Loss) |
|
13.1
|
7.7
|
13.4
|
Ending Balance in AOCI |
|
15.7
|
2.6
|
(5.1)
|
Appalachian Power Co [Member] | Accumulated Other Comprehensive Income [Member] |
|
|
|
|
Pension and OPEB |
|
|
|
|
Net Current Period Other Comprehensive Income (Loss) |
|
17.2
|
2.2
|
10.0
|
Appalachian Power Co [Member] | Interest Rate [Member] | Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member] |
|
|
|
|
Changes in Accumulated Other Comprehensive Income (Loss) by Component |
|
|
|
|
Beginning Balance in AOCI |
|
(0.8)
|
0.9
|
1.8
|
Change in Fair Value Recognized in AOCI |
|
9.2
|
(0.7)
|
0.0
|
Pension and OPEB |
|
|
|
|
Reclassifications from AOCI, before Income Tax (Expense) Benefit |
|
(1.1)
|
(1.3)
|
(1.1)
|
Reclassifications from AOCI, Net of Income Tax (Expense) Benefit |
|
(0.9)
|
(1.0)
|
(0.9)
|
Net Current Period Other Comprehensive Income (Loss) |
|
8.3
|
(1.7)
|
(0.9)
|
Ending Balance in AOCI |
|
7.5
|
(0.8)
|
0.9
|
Appalachian Power Co [Member] | Purchased Electricity for Resale [Member] |
|
|
|
|
Commodity |
|
|
|
|
Purchased Electricity for Resale |
|
539.6
|
360.3
|
391.0
|
Indiana Michigan Power Co [Member] |
|
|
|
|
Changes in Accumulated Other Comprehensive Income (Loss) by Component |
|
|
|
|
Beginning Balance in AOCI |
|
(7.0)
|
(11.6)
|
(13.8)
|
Change in Fair Value Recognized in AOCI |
|
4.2
|
3.1
|
0.8
|
Commodity |
|
|
|
|
Generation and Marketing Revenues |
|
2,330.7
|
2,236.0
|
2,308.1
|
Interest Rate |
|
|
|
|
Interest Expense |
|
116.8
|
112.3
|
117.9
|
Pension and OPEB |
|
|
|
|
Reclassifications from AOCI, before Income Tax (Expense) Benefit |
|
1.9
|
1.9
|
1.8
|
Income Tax (Expense) Benefit |
|
(10.6)
|
(7.5)
|
(10.6)
|
Reclassifications from AOCI, Net of Income Tax (Expense) Benefit |
|
1.5
|
1.5
|
1.4
|
Net Current Period Other Comprehensive Income (Loss) |
|
5.7
|
4.6
|
2.2
|
Ending Balance in AOCI |
|
(1.3)
|
(7.0)
|
(11.6)
|
Indiana Michigan Power Co [Member] | Pension and OPEB [Member] | Amortization of Deferred Costs [Member] |
|
|
|
|
Changes in Accumulated Other Comprehensive Income (Loss) by Component |
|
|
|
|
Beginning Balance in AOCI |
|
4.8
|
4.9
|
5.1
|
Change in Fair Value Recognized in AOCI |
|
0.0
|
0.0
|
0.0
|
Pension and OPEB |
|
|
|
|
Reclassifications from AOCI, before Income Tax (Expense) Benefit |
|
(0.1)
|
(0.1)
|
(0.2)
|
Reclassifications from AOCI, Net of Income Tax (Expense) Benefit |
|
(0.1)
|
(0.1)
|
(0.2)
|
Net Current Period Other Comprehensive Income (Loss) |
|
(0.1)
|
(0.1)
|
(0.2)
|
Ending Balance in AOCI |
|
4.7
|
4.8
|
4.9
|
Indiana Michigan Power Co [Member] | Pension and OPEB [Member] | Changes in Funded Status [Member] |
|
|
|
|
Changes in Accumulated Other Comprehensive Income (Loss) by Component |
|
|
|
|
Beginning Balance in AOCI |
|
(3.5)
|
(6.6)
|
(7.4)
|
Change in Fair Value Recognized in AOCI |
|
4.2
|
3.1
|
0.8
|
Pension and OPEB |
|
|
|
|
Reclassifications from AOCI, before Income Tax (Expense) Benefit |
|
0.0
|
0.0
|
0.0
|
Reclassifications from AOCI, Net of Income Tax (Expense) Benefit |
|
0.0
|
0.0
|
0.0
|
Net Current Period Other Comprehensive Income (Loss) |
|
4.2
|
3.1
|
0.8
|
Ending Balance in AOCI |
|
0.7
|
(3.5)
|
(6.6)
|
Indiana Michigan Power Co [Member] | Accumulated Other Comprehensive Income [Member] |
|
|
|
|
Pension and OPEB |
|
|
|
|
Net Current Period Other Comprehensive Income (Loss) |
|
5.7
|
4.6
|
2.2
|
Indiana Michigan Power Co [Member] | Interest Rate [Member] | Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member] |
|
|
|
|
Changes in Accumulated Other Comprehensive Income (Loss) by Component |
|
|
|
|
Beginning Balance in AOCI |
|
(8.3)
|
(9.9)
|
(11.5)
|
Change in Fair Value Recognized in AOCI |
|
0.0
|
0.0
|
0.0
|
Pension and OPEB |
|
|
|
|
Reclassifications from AOCI, before Income Tax (Expense) Benefit |
|
2.0
|
2.0
|
2.0
|
Reclassifications from AOCI, Net of Income Tax (Expense) Benefit |
|
1.6
|
1.6
|
1.6
|
Net Current Period Other Comprehensive Income (Loss) |
|
1.6
|
1.6
|
1.6
|
Ending Balance in AOCI |
|
(6.7)
|
(8.3)
|
(9.9)
|
Indiana Michigan Power Co [Member] | Purchased Electricity for Resale [Member] |
|
|
|
|
Commodity |
|
|
|
|
Purchased Electricity for Resale |
|
176.8
|
182.2
|
232.3
|
Ohio Power Co [Member] |
|
|
|
|
Commodity |
|
|
|
|
Generation and Marketing Revenues |
|
2,837.5
|
2,665.0
|
2,748.8
|
Interest Rate |
|
|
|
|
Interest Expense |
|
124.4
|
117.2
|
106.2
|
Pension and OPEB |
|
|
|
|
Income Tax (Expense) Benefit |
|
34.4
|
45.2
|
34.9
|
Net Current Period Other Comprehensive Income (Loss) |
|
|
|
(1.0)
|
Ohio Power Co [Member] | Accumulated Other Comprehensive Income [Member] |
|
|
|
|
Pension and OPEB |
|
|
|
|
Net Current Period Other Comprehensive Income (Loss) |
|
|
|
(1.0)
|
Ohio Power Co [Member] | Interest Rate [Member] | Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member] |
|
|
|
|
Changes in Accumulated Other Comprehensive Income (Loss) by Component |
|
|
|
|
Beginning Balance in AOCI |
|
0.0
|
0.0
|
1.0
|
Change in Fair Value Recognized in AOCI |
|
0.0
|
0.0
|
0.0
|
Pension and OPEB |
|
|
|
|
Reclassifications from AOCI, before Income Tax (Expense) Benefit |
|
0.0
|
0.0
|
(1.3)
|
Reclassifications from AOCI, Net of Income Tax (Expense) Benefit |
|
0.0
|
0.0
|
(1.0)
|
Net Current Period Other Comprehensive Income (Loss) |
|
0.0
|
0.0
|
(1.0)
|
Ending Balance in AOCI |
|
0.0
|
0.0
|
0.0
|
Ohio Power Co [Member] | Purchased Electricity for Resale [Member] |
|
|
|
|
Commodity |
|
|
|
|
Purchased Electricity for Resale |
|
678.0
|
549.2
|
607.3
|
Public Service Co Of Oklahoma [Member] |
|
|
|
|
Changes in Accumulated Other Comprehensive Income (Loss) by Component |
|
|
|
|
Beginning Balance in AOCI |
|
0.1
|
|
|
Commodity |
|
|
|
|
Generation and Marketing Revenues |
|
1,474.3
|
1,263.9
|
1,512.8
|
Interest Rate |
|
|
|
|
Interest Expense |
|
62.9
|
60.3
|
66.5
|
Pension and OPEB |
|
|
|
|
Income Tax (Expense) Benefit |
|
4.1
|
5.2
|
7.5
|
Net Current Period Other Comprehensive Income (Loss) |
|
(0.1)
|
(1.0)
|
(1.0)
|
Ending Balance in AOCI |
|
0.0
|
0.1
|
|
Public Service Co Of Oklahoma [Member] | Accumulated Other Comprehensive Income [Member] |
|
|
|
|
Pension and OPEB |
|
|
|
|
Net Current Period Other Comprehensive Income (Loss) |
|
(0.1)
|
(1.0)
|
(1.0)
|
Public Service Co Of Oklahoma [Member] | Interest Rate [Member] | Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member] |
|
|
|
|
Changes in Accumulated Other Comprehensive Income (Loss) by Component |
|
|
|
|
Beginning Balance in AOCI |
|
0.1
|
1.1
|
2.1
|
Change in Fair Value Recognized in AOCI |
|
0.0
|
0.0
|
0.0
|
Pension and OPEB |
|
|
|
|
Reclassifications from AOCI, before Income Tax (Expense) Benefit |
|
(0.1)
|
(1.3)
|
(1.3)
|
Reclassifications from AOCI, Net of Income Tax (Expense) Benefit |
|
(0.1)
|
(1.0)
|
(1.0)
|
Net Current Period Other Comprehensive Income (Loss) |
|
(0.1)
|
(1.0)
|
(1.0)
|
Ending Balance in AOCI |
|
0.0
|
0.1
|
1.1
|
Southwestern Electric Power Co [Member] |
|
|
|
|
Changes in Accumulated Other Comprehensive Income (Loss) by Component |
|
|
|
|
Beginning Balance in AOCI |
|
1.9
|
(1.3)
|
(5.4)
|
Change in Fair Value Recognized in AOCI |
|
4.9
|
3.2
|
3.7
|
Commodity |
|
|
|
|
Generation and Marketing Revenues |
|
2,126.0
|
1,735.3
|
1,799.2
|
Interest Rate |
|
|
|
|
Interest Expense |
|
125.9
|
118.5
|
119.1
|
Pension and OPEB |
|
|
|
|
Reclassifications from AOCI, before Income Tax (Expense) Benefit |
|
(0.1)
|
0.0
|
0.5
|
Income Tax (Expense) Benefit |
|
(0.6)
|
9.4
|
(4.7)
|
Reclassifications from AOCI, Net of Income Tax (Expense) Benefit |
|
(0.1)
|
0.0
|
0.4
|
Net Current Period Other Comprehensive Income (Loss) |
|
4.8
|
3.2
|
4.1
|
Ending Balance in AOCI |
|
6.7
|
1.9
|
(1.3)
|
Southwestern Electric Power Co [Member] | Pension and OPEB [Member] | Amortization of Deferred Costs [Member] |
|
|
|
|
Changes in Accumulated Other Comprehensive Income (Loss) by Component |
|
|
|
|
Beginning Balance in AOCI |
|
(2.8)
|
(1.3)
|
(0.2)
|
Change in Fair Value Recognized in AOCI |
|
0.0
|
0.0
|
0.0
|
Pension and OPEB |
|
|
|
|
Reclassifications from AOCI, before Income Tax (Expense) Benefit |
|
(2.0)
|
(1.9)
|
(1.4)
|
Reclassifications from AOCI, Net of Income Tax (Expense) Benefit |
|
(1.6)
|
(1.5)
|
(1.1)
|
Net Current Period Other Comprehensive Income (Loss) |
|
(1.6)
|
(1.5)
|
(1.1)
|
Ending Balance in AOCI |
|
(4.4)
|
(2.8)
|
(1.3)
|
Southwestern Electric Power Co [Member] | Pension and OPEB [Member] | Changes in Funded Status [Member] |
|
|
|
|
Changes in Accumulated Other Comprehensive Income (Loss) by Component |
|
|
|
|
Beginning Balance in AOCI |
|
5.0
|
1.8
|
(1.9)
|
Change in Fair Value Recognized in AOCI |
|
4.9
|
3.2
|
3.7
|
Pension and OPEB |
|
|
|
|
Reclassifications from AOCI, before Income Tax (Expense) Benefit |
|
0.0
|
0.0
|
0.0
|
Reclassifications from AOCI, Net of Income Tax (Expense) Benefit |
|
0.0
|
0.0
|
0.0
|
Net Current Period Other Comprehensive Income (Loss) |
|
4.9
|
3.2
|
3.7
|
Ending Balance in AOCI |
|
9.9
|
5.0
|
1.8
|
Southwestern Electric Power Co [Member] | Accumulated Other Comprehensive Income [Member] |
|
|
|
|
Pension and OPEB |
|
|
|
|
Net Current Period Other Comprehensive Income (Loss) |
|
4.8
|
3.2
|
4.1
|
Southwestern Electric Power Co [Member] | Interest Rate [Member] | Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member] |
|
|
|
|
Changes in Accumulated Other Comprehensive Income (Loss) by Component |
|
|
|
|
Beginning Balance in AOCI |
|
(0.3)
|
(1.8)
|
(3.3)
|
Change in Fair Value Recognized in AOCI |
|
0.0
|
0.0
|
0.0
|
Pension and OPEB |
|
|
|
|
Reclassifications from AOCI, before Income Tax (Expense) Benefit |
|
1.9
|
1.9
|
1.9
|
Reclassifications from AOCI, Net of Income Tax (Expense) Benefit |
|
1.5
|
1.5
|
1.5
|
Net Current Period Other Comprehensive Income (Loss) |
|
1.5
|
1.5
|
1.5
|
Ending Balance in AOCI |
|
1.2
|
(0.3)
|
(1.8)
|
Reclassifications from Accumulated Other Comprehensive Income [Member] |
|
|
|
|
Interest Rate |
|
|
|
|
Interest Expense |
[2] |
6.5
|
4.9
|
1.5
|
Pension and OPEB |
|
|
|
|
Amortization of Prior Service Cost (Credit) |
|
(19.4)
|
(19.2)
|
(19.2)
|
Amortization of Actuarial (Gains) Losses |
|
9.1
|
10.3
|
12.1
|
Income Tax (Expense) Benefit |
|
(71.0)
|
34.2
|
11.3
|
Reclassifications from Accumulated Other Comprehensive Income [Member] | Pension and OPEB [Member] | Amortization of Deferred Costs [Member] |
|
|
|
|
Interest Rate |
|
|
|
|
Interest Expense |
[2] |
0.0
|
0.0
|
0.0
|
Pension and OPEB |
|
|
|
|
Amortization of Prior Service Cost (Credit) |
|
(19.4)
|
(19.2)
|
(19.2)
|
Amortization of Actuarial (Gains) Losses |
|
9.1
|
10.3
|
12.1
|
Income Tax (Expense) Benefit |
|
(2.2)
|
(1.9)
|
(1.5)
|
Reclassifications from Accumulated Other Comprehensive Income [Member] | Pension and OPEB [Member] | Changes in Funded Status [Member] |
|
|
|
|
Interest Rate |
|
|
|
|
Interest Expense |
[2] |
0.0
|
0.0
|
0.0
|
Pension and OPEB |
|
|
|
|
Amortization of Prior Service Cost (Credit) |
|
0.0
|
0.0
|
0.0
|
Amortization of Actuarial (Gains) Losses |
|
0.0
|
0.0
|
0.0
|
Income Tax (Expense) Benefit |
|
0.0
|
0.0
|
0.0
|
Reclassifications from Accumulated Other Comprehensive Income [Member] | Commodity [Member] | Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member] |
|
|
|
|
Interest Rate |
|
|
|
|
Interest Expense |
[2] |
0.0
|
0.0
|
0.0
|
Pension and OPEB |
|
|
|
|
Amortization of Prior Service Cost (Credit) |
|
0.0
|
0.0
|
0.0
|
Amortization of Actuarial (Gains) Losses |
|
0.0
|
0.0
|
0.0
|
Income Tax (Expense) Benefit |
|
(70.2)
|
35.1
|
12.6
|
Reclassifications from Accumulated Other Comprehensive Income [Member] | Interest Rate [Member] | Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member] |
|
|
|
|
Interest Rate |
|
|
|
|
Interest Expense |
[2] |
6.5
|
4.9
|
1.5
|
Pension and OPEB |
|
|
|
|
Amortization of Prior Service Cost (Credit) |
|
0.0
|
0.0
|
0.0
|
Amortization of Actuarial (Gains) Losses |
|
0.0
|
0.0
|
0.0
|
Income Tax (Expense) Benefit |
|
1.4
|
1.0
|
0.2
|
Reclassifications from Accumulated Other Comprehensive Income [Member] | Generation and Marketing Revenues [Member] |
|
|
|
|
Commodity |
|
|
|
|
Generation and Marketing Revenues |
[2] |
0.7
|
(0.4)
|
(0.2)
|
Reclassifications from Accumulated Other Comprehensive Income [Member] | Generation and Marketing Revenues [Member] | Pension and OPEB [Member] | Amortization of Deferred Costs [Member] |
|
|
|
|
Commodity |
|
|
|
|
Generation and Marketing Revenues |
[2] |
0.0
|
0.0
|
0.0
|
Reclassifications from Accumulated Other Comprehensive Income [Member] | Generation and Marketing Revenues [Member] | Pension and OPEB [Member] | Changes in Funded Status [Member] |
|
|
|
|
Commodity |
|
|
|
|
Generation and Marketing Revenues |
[2] |
0.0
|
0.0
|
0.0
|
Reclassifications from Accumulated Other Comprehensive Income [Member] | Generation and Marketing Revenues [Member] | Commodity [Member] | Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member] |
|
|
|
|
Commodity |
|
|
|
|
Generation and Marketing Revenues |
[2] |
0.7
|
(0.4)
|
(0.2)
|
Reclassifications from Accumulated Other Comprehensive Income [Member] | Generation and Marketing Revenues [Member] | Interest Rate [Member] | Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member] |
|
|
|
|
Commodity |
|
|
|
|
Generation and Marketing Revenues |
[2] |
0.0
|
0.0
|
0.0
|
Reclassifications from Accumulated Other Comprehensive Income [Member] | Purchased Electricity for Resale [Member] |
|
|
|
|
Commodity |
|
|
|
|
Purchased Electricity for Resale |
[2] |
(334.8)
|
167.6
|
59.5
|
Reclassifications from Accumulated Other Comprehensive Income [Member] | Purchased Electricity for Resale [Member] | Pension and OPEB [Member] | Amortization of Deferred Costs [Member] |
|
|
|
|
Commodity |
|
|
|
|
Purchased Electricity for Resale |
[2] |
0.0
|
0.0
|
0.0
|
Reclassifications from Accumulated Other Comprehensive Income [Member] | Purchased Electricity for Resale [Member] | Pension and OPEB [Member] | Changes in Funded Status [Member] |
|
|
|
|
Commodity |
|
|
|
|
Purchased Electricity for Resale |
[2] |
0.0
|
0.0
|
0.0
|
Reclassifications from Accumulated Other Comprehensive Income [Member] | Purchased Electricity for Resale [Member] | Commodity [Member] | Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member] |
|
|
|
|
Commodity |
|
|
|
|
Purchased Electricity for Resale |
[2] |
(334.8)
|
167.6
|
59.5
|
Reclassifications from Accumulated Other Comprehensive Income [Member] | Purchased Electricity for Resale [Member] | Interest Rate [Member] | Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member] |
|
|
|
|
Commodity |
|
|
|
|
Purchased Electricity for Resale |
[2] |
0.0
|
0.0
|
0.0
|
Reclassifications from Accumulated Other Comprehensive Income [Member] | AEP Texas Inc. [Member] |
|
|
|
|
Interest Rate |
|
|
|
|
Interest Expense |
[2] |
1.2
|
1.3
|
1.3
|
Pension and OPEB |
|
|
|
|
Amortization of Prior Service Cost (Credit) |
|
(0.1)
|
(0.1)
|
(0.1)
|
Amortization of Actuarial (Gains) Losses |
|
0.3
|
0.3
|
0.3
|
Income Tax (Expense) Benefit |
|
0.3
|
0.3
|
0.3
|
Reclassifications from Accumulated Other Comprehensive Income [Member] | AEP Texas Inc. [Member] | Pension and OPEB [Member] | Amortization of Deferred Costs [Member] |
|
|
|
|
Interest Rate |
|
|
|
|
Interest Expense |
[2] |
0.0
|
0.0
|
0.0
|
Pension and OPEB |
|
|
|
|
Amortization of Prior Service Cost (Credit) |
|
(0.1)
|
(0.1)
|
(0.1)
|
Amortization of Actuarial (Gains) Losses |
|
0.3
|
0.3
|
0.3
|
Income Tax (Expense) Benefit |
|
0.0
|
0.0
|
0.0
|
Reclassifications from Accumulated Other Comprehensive Income [Member] | AEP Texas Inc. [Member] | Pension and OPEB [Member] | Changes in Funded Status [Member] |
|
|
|
|
Interest Rate |
|
|
|
|
Interest Expense |
[2] |
0.0
|
0.0
|
0.0
|
Pension and OPEB |
|
|
|
|
Amortization of Prior Service Cost (Credit) |
|
0.0
|
0.0
|
0.0
|
Amortization of Actuarial (Gains) Losses |
|
0.0
|
0.0
|
0.0
|
Income Tax (Expense) Benefit |
|
0.0
|
0.0
|
0.0
|
Reclassifications from Accumulated Other Comprehensive Income [Member] | AEP Texas Inc. [Member] | Interest Rate [Member] | Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member] |
|
|
|
|
Interest Rate |
|
|
|
|
Interest Expense |
[2] |
1.2
|
1.3
|
1.3
|
Pension and OPEB |
|
|
|
|
Amortization of Prior Service Cost (Credit) |
|
0.0
|
0.0
|
0.0
|
Amortization of Actuarial (Gains) Losses |
|
0.0
|
0.0
|
0.0
|
Income Tax (Expense) Benefit |
|
0.3
|
0.3
|
0.3
|
Reclassifications from Accumulated Other Comprehensive Income [Member] | Appalachian Power Co [Member] |
|
|
|
|
Interest Rate |
|
|
|
|
Interest Expense |
[2] |
(1.1)
|
(1.3)
|
(1.1)
|
Pension and OPEB |
|
|
|
|
Amortization of Prior Service Cost (Credit) |
|
(5.3)
|
(5.3)
|
(5.3)
|
Amortization of Actuarial (Gains) Losses |
|
|
0.5
|
2.1
|
Income Tax (Expense) Benefit |
|
(1.3)
|
(1.3)
|
(0.9)
|
Reclassifications from Accumulated Other Comprehensive Income [Member] | Appalachian Power Co [Member] | Pension and OPEB [Member] | Amortization of Deferred Costs [Member] |
|
|
|
|
Interest Rate |
|
|
|
|
Interest Expense |
[2] |
0.0
|
0.0
|
0.0
|
Pension and OPEB |
|
|
|
|
Amortization of Prior Service Cost (Credit) |
|
(5.3)
|
(5.3)
|
(5.3)
|
Amortization of Actuarial (Gains) Losses |
|
|
0.5
|
2.1
|
Income Tax (Expense) Benefit |
|
(1.1)
|
(1.0)
|
(0.7)
|
Reclassifications from Accumulated Other Comprehensive Income [Member] | Appalachian Power Co [Member] | Pension and OPEB [Member] | Changes in Funded Status [Member] |
|
|
|
|
Interest Rate |
|
|
|
|
Interest Expense |
[2] |
0.0
|
0.0
|
0.0
|
Pension and OPEB |
|
|
|
|
Amortization of Prior Service Cost (Credit) |
|
0.0
|
0.0
|
0.0
|
Amortization of Actuarial (Gains) Losses |
|
|
0.0
|
0.0
|
Income Tax (Expense) Benefit |
|
0.0
|
0.0
|
0.0
|
Reclassifications from Accumulated Other Comprehensive Income [Member] | Appalachian Power Co [Member] | Interest Rate [Member] | Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member] |
|
|
|
|
Interest Rate |
|
|
|
|
Interest Expense |
[2] |
(1.1)
|
(1.3)
|
(1.1)
|
Pension and OPEB |
|
|
|
|
Amortization of Prior Service Cost (Credit) |
|
0.0
|
0.0
|
0.0
|
Amortization of Actuarial (Gains) Losses |
|
|
0.0
|
0.0
|
Income Tax (Expense) Benefit |
|
(0.2)
|
(0.3)
|
(0.2)
|
Reclassifications from Accumulated Other Comprehensive Income [Member] | Indiana Michigan Power Co [Member] |
|
|
|
|
Interest Rate |
|
|
|
|
Interest Expense |
[2] |
2.0
|
2.0
|
2.0
|
Pension and OPEB |
|
|
|
|
Amortization of Prior Service Cost (Credit) |
|
(0.8)
|
(0.8)
|
(0.8)
|
Amortization of Actuarial (Gains) Losses |
|
0.7
|
0.7
|
0.6
|
Income Tax (Expense) Benefit |
|
0.4
|
0.4
|
0.4
|
Reclassifications from Accumulated Other Comprehensive Income [Member] | Indiana Michigan Power Co [Member] | Pension and OPEB [Member] | Amortization of Deferred Costs [Member] |
|
|
|
|
Interest Rate |
|
|
|
|
Interest Expense |
[2] |
0.0
|
0.0
|
0.0
|
Pension and OPEB |
|
|
|
|
Amortization of Prior Service Cost (Credit) |
|
(0.8)
|
(0.8)
|
(0.8)
|
Amortization of Actuarial (Gains) Losses |
|
0.7
|
0.7
|
0.6
|
Income Tax (Expense) Benefit |
|
0.0
|
0.0
|
0.0
|
Reclassifications from Accumulated Other Comprehensive Income [Member] | Indiana Michigan Power Co [Member] | Pension and OPEB [Member] | Changes in Funded Status [Member] |
|
|
|
|
Interest Rate |
|
|
|
|
Interest Expense |
[2] |
0.0
|
0.0
|
0.0
|
Pension and OPEB |
|
|
|
|
Amortization of Prior Service Cost (Credit) |
|
0.0
|
0.0
|
0.0
|
Amortization of Actuarial (Gains) Losses |
|
0.0
|
0.0
|
0.0
|
Income Tax (Expense) Benefit |
|
0.0
|
0.0
|
0.0
|
Reclassifications from Accumulated Other Comprehensive Income [Member] | Indiana Michigan Power Co [Member] | Interest Rate [Member] | Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member] |
|
|
|
|
Interest Rate |
|
|
|
|
Interest Expense |
[2] |
2.0
|
2.0
|
2.0
|
Pension and OPEB |
|
|
|
|
Amortization of Prior Service Cost (Credit) |
|
0.0
|
0.0
|
0.0
|
Amortization of Actuarial (Gains) Losses |
|
0.0
|
0.0
|
0.0
|
Income Tax (Expense) Benefit |
|
0.4
|
0.4
|
0.4
|
Reclassifications from Accumulated Other Comprehensive Income [Member] | Ohio Power Co [Member] | Interest Rate [Member] | Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member] |
|
|
|
|
Interest Rate |
|
|
|
|
Interest Expense |
[2] |
0.0
|
0.0
|
(1.3)
|
Pension and OPEB |
|
|
|
|
Income Tax (Expense) Benefit |
|
0.0
|
0.0
|
(0.3)
|
Reclassifications from Accumulated Other Comprehensive Income [Member] | Public Service Co Of Oklahoma [Member] | Interest Rate [Member] | Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member] |
|
|
|
|
Interest Rate |
|
|
|
|
Interest Expense |
[2] |
(0.1)
|
(1.3)
|
(1.3)
|
Pension and OPEB |
|
|
|
|
Income Tax (Expense) Benefit |
|
0.0
|
(0.3)
|
(0.3)
|
Reclassifications from Accumulated Other Comprehensive Income [Member] | Southwestern Electric Power Co [Member] |
|
|
|
|
Interest Rate |
|
|
|
|
Interest Expense |
[2] |
1.9
|
1.9
|
1.9
|
Pension and OPEB |
|
|
|
|
Amortization of Prior Service Cost (Credit) |
|
(2.0)
|
(2.0)
|
(2.0)
|
Amortization of Actuarial (Gains) Losses |
|
0.0
|
0.1
|
0.6
|
Income Tax (Expense) Benefit |
|
0.0
|
0.0
|
0.1
|
Reclassifications from Accumulated Other Comprehensive Income [Member] | Southwestern Electric Power Co [Member] | Pension and OPEB [Member] | Amortization of Deferred Costs [Member] |
|
|
|
|
Interest Rate |
|
|
|
|
Interest Expense |
[2] |
0.0
|
0.0
|
0.0
|
Pension and OPEB |
|
|
|
|
Amortization of Prior Service Cost (Credit) |
|
(2.0)
|
(2.0)
|
(2.0)
|
Amortization of Actuarial (Gains) Losses |
|
0.0
|
0.1
|
0.6
|
Income Tax (Expense) Benefit |
|
(0.4)
|
(0.4)
|
(0.3)
|
Reclassifications from Accumulated Other Comprehensive Income [Member] | Southwestern Electric Power Co [Member] | Pension and OPEB [Member] | Changes in Funded Status [Member] |
|
|
|
|
Interest Rate |
|
|
|
|
Interest Expense |
[2] |
0.0
|
0.0
|
0.0
|
Pension and OPEB |
|
|
|
|
Amortization of Prior Service Cost (Credit) |
|
0.0
|
0.0
|
0.0
|
Amortization of Actuarial (Gains) Losses |
|
0.0
|
0.0
|
0.0
|
Income Tax (Expense) Benefit |
|
0.0
|
0.0
|
0.0
|
Reclassifications from Accumulated Other Comprehensive Income [Member] | Southwestern Electric Power Co [Member] | Interest Rate [Member] | Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member] |
|
|
|
|
Interest Rate |
|
|
|
|
Interest Expense |
[2] |
1.9
|
1.9
|
1.9
|
Pension and OPEB |
|
|
|
|
Amortization of Prior Service Cost (Credit) |
|
0.0
|
0.0
|
0.0
|
Amortization of Actuarial (Gains) Losses |
|
0.0
|
0.0
|
0.0
|
Income Tax (Expense) Benefit |
|
$ 0.4
|
$ 0.4
|
$ 0.4
|
|
|