Fair Value Long-term Debt, Other Temporary Investments, Nuclear Trusts (Details) - USD ($)
|
3 Months Ended |
6 Months Ended |
12 Months Ended |
Jun. 30, 2022 |
Jun. 30, 2021 |
Jun. 30, 2022 |
Jun. 30, 2021 |
Dec. 31, 2021 |
Book Values and Fair Values of Long - term Debt |
|
|
|
|
|
|
|
Total Long-term Debt Outstanding |
[1] |
$ 35,459,400,000
|
|
$ 35,459,400,000
|
|
|
$ 33,454,500,000
|
Long Term Debt, Fair Value |
[2],[3] |
33,197,500,000
|
|
33,197,500,000
|
|
|
37,564,700,000
|
Other Temporary Investments |
|
|
|
|
|
|
|
Cost |
|
223,000,000.0
|
|
223,000,000.0
|
|
|
232,000,000.0
|
Gross Unrealized Gains |
|
21,100,000
|
|
21,100,000
|
|
|
36,400,000
|
Gross Unrealized Losses |
|
(6,200,000)
|
|
(6,200,000)
|
|
|
0
|
Other Short-term Investments |
|
237,900,000
|
|
237,900,000
|
|
|
268,400,000
|
Debt and Equity Securities Within Other Temporary Investments |
|
|
|
|
|
|
|
Proceeds from Investment Sales |
|
11,100,000
|
$ 3,600,000
|
15,000,000.0
|
|
$ 9,100,000
|
|
Purchases of Investments |
|
800,000
|
12,400,000
|
1,600,000
|
|
13,100,000
|
|
Gross Realized Gains on Investment Sales |
|
3,300,000
|
1,100,000
|
3,600,000
|
|
1,200,000
|
|
Gross Realized Losses on Investment Sales |
|
400,000
|
0
|
500,000
|
|
0
|
|
Nuclear Trust Fund Investments |
|
|
|
|
|
|
|
Fair Value |
|
3,280,800,000
|
|
3,280,800,000
|
|
|
3,867,000,000
|
Contractual Maturities, Fair Value of Debt Securities |
|
|
|
|
|
|
|
Fair Value |
|
3,280,800,000
|
|
3,280,800,000
|
|
|
3,867,000,000
|
Fair Value Measurements (Textuals) |
|
|
|
|
|
|
|
Liabilities Held for Sale |
|
1,900,300,000
|
|
1,900,300,000
|
|
|
1,880,900,000
|
Spent Nuclear Fuel and Decommissioning Trusts [Member] |
|
|
|
|
|
|
|
Unrealized Gain on Securities |
|
|
|
1,400,000,000
|
|
|
1,900,000,000
|
Nuclear Trust Fund Investments |
|
|
|
|
|
|
|
Gross Unrealized Gains |
|
|
|
1,406,200,000
|
|
|
1,974,700,000
|
Securities Activity Within Decommissioning and SNF Trusts |
|
|
|
|
|
|
|
Proceeds from Investment Sales |
|
736,400,000
|
802,700,000
|
1,229,900,000
|
|
1,122,700,000
|
|
Purchases of Investments |
|
745,500,000
|
812,800,000
|
1,253,200,000
|
|
1,149,700,000
|
|
Gross Realized Gains on Investment Sales |
|
10,900,000
|
83,300,000
|
16,700,000
|
|
88,700,000
|
|
Gross Realized Losses on Investment Sales |
|
17,900,000
|
1,300,000
|
25,100,000
|
|
5,500,000
|
|
Contractual Maturities, Fair Value of Debt Securities |
|
|
|
|
|
|
|
Within 1 year |
|
356,200,000
|
|
356,200,000
|
|
|
|
After 1 year through 5 years |
|
398,500,000
|
|
398,500,000
|
|
|
|
After 5 years through 10 years |
|
248,000,000.0
|
|
248,000,000.0
|
|
|
|
After 10 years |
|
206,200,000
|
|
206,200,000
|
|
|
|
Fair Value Measurements (Textuals) |
|
|
|
|
|
|
|
Adjusted Cost of Debt Securities |
|
1,200,000,000
|
|
1,200,000,000
|
|
|
1,200,000,000
|
Adjusted Cost of Domestic Equity Securities |
|
650,000,000
|
|
650,000,000
|
|
|
641,000,000
|
Unrealized Loss on Securities |
|
|
|
11,000,000
|
|
|
4,000,000
|
Other than Temporary Impairment Losses, Investments |
|
|
|
(20,800,000)
|
|
|
(10,100,000)
|
Cash [Member] |
|
|
|
|
|
|
|
Other Temporary Investments |
|
|
|
|
|
|
|
Cost |
[4] |
45,900,000
|
|
45,900,000
|
|
|
48,000,000.0
|
Gross Unrealized Gains |
[4] |
0
|
|
0
|
|
|
0
|
Gross Unrealized Losses |
[4] |
0
|
|
0
|
|
|
0
|
Other Short-term Investments |
[4] |
45,900,000
|
|
45,900,000
|
|
|
48,000,000.0
|
Fixed Income Funds [Member] |
|
|
|
|
|
|
|
Nuclear Trust Fund Investments |
|
|
|
|
|
|
|
Fair Value |
|
1,208,900,000
|
|
1,208,900,000
|
|
|
1,240,400,000
|
Contractual Maturities, Fair Value of Debt Securities |
|
|
|
|
|
|
|
Fair Value |
|
1,208,900,000
|
|
1,208,900,000
|
|
|
1,240,400,000
|
Fixed Income Funds [Member] | Spent Nuclear Fuel and Decommissioning Trusts [Member] |
|
|
|
|
|
|
|
Nuclear Trust Fund Investments |
|
|
|
|
|
|
|
Gross Unrealized Gains |
|
|
|
1,200,000
|
|
|
73,400,000
|
Fair Value Measurements (Textuals) |
|
|
|
|
|
|
|
Other than Temporary Impairment Losses, Investments |
|
|
|
(20,800,000)
|
|
|
(10,100,000)
|
Mutual Funds Fixed Income [Member] |
|
|
|
|
|
|
|
Other Temporary Investments |
|
|
|
|
|
|
|
Cost |
[5] |
146,600,000
|
|
146,600,000
|
|
|
154,300,000
|
Gross Unrealized Gains |
[5] |
0
|
|
0
|
|
|
500,000
|
Gross Unrealized Losses |
[5] |
(6,200,000)
|
|
(6,200,000)
|
|
|
0
|
Other Short-term Investments |
[5] |
140,400,000
|
|
140,400,000
|
|
|
154,800,000
|
Domestic [Member] |
|
|
|
|
|
|
|
Nuclear Trust Fund Investments |
|
|
|
|
|
|
|
Fair Value |
[6] |
2,055,300,000
|
|
2,055,300,000
|
|
|
2,541,900,000
|
Contractual Maturities, Fair Value of Debt Securities |
|
|
|
|
|
|
|
Fair Value |
[6] |
2,055,300,000
|
|
2,055,300,000
|
|
|
2,541,900,000
|
Domestic [Member] | Spent Nuclear Fuel and Decommissioning Trusts [Member] |
|
|
|
|
|
|
|
Nuclear Trust Fund Investments |
|
|
|
|
|
|
|
Gross Unrealized Gains |
[7] |
|
|
1,405,000,000
|
|
|
1,901,300,000
|
Fair Value Measurements (Textuals) |
|
|
|
|
|
|
|
Other than Temporary Impairment Losses, Investments |
|
|
|
0
|
|
|
0
|
Mutual Funds Equity [Member] |
|
|
|
|
|
|
|
Other Temporary Investments |
|
|
|
|
|
|
|
Cost |
|
17,100,000
|
|
17,100,000
|
|
|
19,700,000
|
Gross Unrealized Gains |
|
21,100,000
|
|
21,100,000
|
|
|
35,900,000
|
Gross Unrealized Losses |
|
0
|
|
0
|
|
|
0
|
Other Short-term Investments |
[6] |
38,200,000
|
|
38,200,000
|
|
|
55,600,000
|
Cash and Cash Equivalents [Member] |
|
|
|
|
|
|
|
Nuclear Trust Fund Investments |
|
|
|
|
|
|
|
Fair Value |
[8] |
16,600,000
|
|
16,600,000
|
|
|
84,700,000
|
Contractual Maturities, Fair Value of Debt Securities |
|
|
|
|
|
|
|
Fair Value |
[8] |
16,600,000
|
|
16,600,000
|
|
|
84,700,000
|
Cash and Cash Equivalents [Member] | Spent Nuclear Fuel and Decommissioning Trusts [Member] |
|
|
|
|
|
|
|
Nuclear Trust Fund Investments |
|
|
|
|
|
|
|
Gross Unrealized Gains |
|
|
|
0
|
|
|
0
|
Fair Value Measurements (Textuals) |
|
|
|
|
|
|
|
Other than Temporary Impairment Losses, Investments |
|
|
|
0
|
|
|
0
|
US Government Agencies Debt Securities [Member] |
|
|
|
|
|
|
|
Nuclear Trust Fund Investments |
|
|
|
|
|
|
|
Fair Value |
|
1,139,500,000
|
|
1,139,500,000
|
|
|
1,156,400,000
|
Contractual Maturities, Fair Value of Debt Securities |
|
|
|
|
|
|
|
Fair Value |
|
1,139,500,000
|
|
1,139,500,000
|
|
|
1,156,400,000
|
US Government Agencies Debt Securities [Member] | Spent Nuclear Fuel and Decommissioning Trusts [Member] |
|
|
|
|
|
|
|
Nuclear Trust Fund Investments |
|
|
|
|
|
|
|
Gross Unrealized Gains |
|
|
|
5,300,000
|
|
|
66,300,000
|
Fair Value Measurements (Textuals) |
|
|
|
|
|
|
|
Other than Temporary Impairment Losses, Investments |
|
|
|
(14,700,000)
|
|
|
(7,900,000)
|
Corporate Debt [Member] |
|
|
|
|
|
|
|
Nuclear Trust Fund Investments |
|
|
|
|
|
|
|
Fair Value |
|
62,300,000
|
|
62,300,000
|
|
|
76,700,000
|
Contractual Maturities, Fair Value of Debt Securities |
|
|
|
|
|
|
|
Fair Value |
|
62,300,000
|
|
62,300,000
|
|
|
76,700,000
|
Corporate Debt [Member] | Spent Nuclear Fuel and Decommissioning Trusts [Member] |
|
|
|
|
|
|
|
Nuclear Trust Fund Investments |
|
|
|
|
|
|
|
Gross Unrealized Gains |
|
|
|
(4,200,000)
|
|
|
6,700,000
|
Fair Value Measurements (Textuals) |
|
|
|
|
|
|
|
Other than Temporary Impairment Losses, Investments |
|
|
|
(6,000,000.0)
|
|
|
(2,100,000)
|
State and Local Jurisdiction [Member] |
|
|
|
|
|
|
|
Nuclear Trust Fund Investments |
|
|
|
|
|
|
|
Fair Value |
|
7,100,000
|
|
7,100,000
|
|
|
7,300,000
|
Contractual Maturities, Fair Value of Debt Securities |
|
|
|
|
|
|
|
Fair Value |
|
7,100,000
|
|
7,100,000
|
|
|
7,300,000
|
State and Local Jurisdiction [Member] | Spent Nuclear Fuel and Decommissioning Trusts [Member] |
|
|
|
|
|
|
|
Nuclear Trust Fund Investments |
|
|
|
|
|
|
|
Gross Unrealized Gains |
|
|
|
100,000
|
|
|
400,000
|
Fair Value Measurements (Textuals) |
|
|
|
|
|
|
|
Other than Temporary Impairment Losses, Investments |
|
|
|
(100,000)
|
|
|
(100,000)
|
Other Cash Deposits [Member] |
|
|
|
|
|
|
|
Other Temporary Investments |
|
|
|
|
|
|
|
Cost |
|
13,400,000
|
|
13,400,000
|
|
|
10,000,000.0
|
Gross Unrealized Gains |
|
0
|
|
0
|
|
|
0
|
Gross Unrealized Losses |
|
0
|
|
0
|
|
|
0
|
Other Short-term Investments |
|
13,400,000
|
|
13,400,000
|
|
|
10,000,000.0
|
AEP Texas Inc. [Member] |
|
|
|
|
|
|
|
Book Values and Fair Values of Long - term Debt |
|
|
|
|
|
|
|
Total Long-term Debt Outstanding |
|
6,128,200,000
|
|
6,128,200,000
|
|
|
5,180,800,000
|
Long Term Debt, Fair Value |
|
5,730,500,000
|
|
5,730,500,000
|
|
|
5,663,800,000
|
AEP Transmission Co [Member] |
|
|
|
|
|
|
|
Book Values and Fair Values of Long - term Debt |
|
|
|
|
|
|
|
Total Long-term Debt Outstanding |
|
4,885,600,000
|
|
4,885,600,000
|
|
|
4,343,900,000
|
Long Term Debt, Fair Value |
|
4,438,100,000
|
|
4,438,100,000
|
|
|
4,968,200,000
|
Fair Value Measurements (Textuals) |
|
|
|
|
|
|
|
Liabilities Held for Sale |
|
27,600,000
|
|
27,600,000
|
|
|
27,600,000
|
Appalachian Power Co [Member] |
|
|
|
|
|
|
|
Book Values and Fair Values of Long - term Debt |
|
|
|
|
|
|
|
Total Long-term Debt Outstanding |
|
4,927,200,000
|
|
4,927,200,000
|
|
|
4,938,900,000
|
Long Term Debt, Fair Value |
|
4,907,800,000
|
|
4,907,800,000
|
|
|
6,037,100,000
|
Indiana Michigan Power Co [Member] |
|
|
|
|
|
|
|
Book Values and Fair Values of Long - term Debt |
|
|
|
|
|
|
|
Total Long-term Debt Outstanding |
|
3,228,700,000
|
|
3,228,700,000
|
|
|
3,195,000,000
|
Long Term Debt, Fair Value |
|
3,072,200,000
|
|
3,072,200,000
|
|
|
3,748,000,000
|
Nuclear Trust Fund Investments |
|
|
|
|
|
|
|
Fair Value |
|
3,280,800,000
|
|
3,280,800,000
|
|
|
3,867,000,000
|
Contractual Maturities, Fair Value of Debt Securities |
|
|
|
|
|
|
|
Fair Value |
|
3,280,800,000
|
|
3,280,800,000
|
|
|
3,867,000,000
|
Indiana Michigan Power Co [Member] | Spent Nuclear Fuel and Decommissioning Trusts [Member] |
|
|
|
|
|
|
|
Unrealized Gain on Securities |
|
|
|
1,400,000,000
|
|
|
1,900,000,000
|
Nuclear Trust Fund Investments |
|
|
|
|
|
|
|
Gross Unrealized Gains |
|
|
|
1,406,200,000
|
|
|
1,974,700,000
|
Securities Activity Within Decommissioning and SNF Trusts |
|
|
|
|
|
|
|
Proceeds from Investment Sales |
|
736,400,000
|
802,700,000
|
1,229,900,000
|
|
1,122,700,000
|
|
Purchases of Investments |
|
745,500,000
|
812,800,000
|
1,253,200,000
|
|
1,149,700,000
|
|
Gross Realized Gains on Investment Sales |
|
10,900,000
|
83,300,000
|
16,700,000
|
|
88,700,000
|
|
Gross Realized Losses on Investment Sales |
|
17,900,000
|
$ 1,300,000
|
25,100,000
|
|
$ 5,500,000
|
|
Contractual Maturities, Fair Value of Debt Securities |
|
|
|
|
|
|
|
Within 1 year |
|
356,200,000
|
|
356,200,000
|
|
|
|
After 1 year through 5 years |
|
398,500,000
|
|
398,500,000
|
|
|
|
After 5 years through 10 years |
|
248,000,000.0
|
|
248,000,000.0
|
|
|
|
After 10 years |
|
206,200,000
|
|
206,200,000
|
|
|
|
Fair Value Measurements (Textuals) |
|
|
|
|
|
|
|
Adjusted Cost of Debt Securities |
|
1,200,000,000
|
|
1,200,000,000
|
|
|
1,200,000,000
|
Adjusted Cost of Domestic Equity Securities |
|
650,000,000
|
|
650,000,000
|
|
|
641,000,000
|
Unrealized Loss on Securities |
|
|
|
11,000,000
|
|
|
4,000,000
|
Other than Temporary Impairment Losses, Investments |
|
|
|
(20,800,000)
|
|
|
(10,100,000)
|
Indiana Michigan Power Co [Member] | Fixed Income Funds [Member] |
|
|
|
|
|
|
|
Nuclear Trust Fund Investments |
|
|
|
|
|
|
|
Fair Value |
|
1,208,900,000
|
|
1,208,900,000
|
|
|
1,240,400,000
|
Contractual Maturities, Fair Value of Debt Securities |
|
|
|
|
|
|
|
Fair Value |
|
1,208,900,000
|
|
1,208,900,000
|
|
|
1,240,400,000
|
Indiana Michigan Power Co [Member] | Fixed Income Funds [Member] | Spent Nuclear Fuel and Decommissioning Trusts [Member] |
|
|
|
|
|
|
|
Nuclear Trust Fund Investments |
|
|
|
|
|
|
|
Gross Unrealized Gains |
|
|
|
1,200,000
|
|
|
73,400,000
|
Fair Value Measurements (Textuals) |
|
|
|
|
|
|
|
Other than Temporary Impairment Losses, Investments |
|
|
|
(20,800,000)
|
|
|
(10,100,000)
|
Indiana Michigan Power Co [Member] | Domestic [Member] |
|
|
|
|
|
|
|
Nuclear Trust Fund Investments |
|
|
|
|
|
|
|
Fair Value |
[6] |
2,055,300,000
|
|
2,055,300,000
|
|
|
2,541,900,000
|
Contractual Maturities, Fair Value of Debt Securities |
|
|
|
|
|
|
|
Fair Value |
[6] |
2,055,300,000
|
|
2,055,300,000
|
|
|
2,541,900,000
|
Indiana Michigan Power Co [Member] | Domestic [Member] | Spent Nuclear Fuel and Decommissioning Trusts [Member] |
|
|
|
|
|
|
|
Nuclear Trust Fund Investments |
|
|
|
|
|
|
|
Gross Unrealized Gains |
|
|
|
1,405,000,000
|
[7] |
|
1,901,300,000
|
Fair Value Measurements (Textuals) |
|
|
|
|
|
|
|
Other than Temporary Impairment Losses, Investments |
|
|
|
0
|
|
|
0
|
Indiana Michigan Power Co [Member] | Cash and Cash Equivalents [Member] |
|
|
|
|
|
|
|
Nuclear Trust Fund Investments |
|
|
|
|
|
|
|
Fair Value |
[8] |
16,600,000
|
|
16,600,000
|
|
|
84,700,000
|
Contractual Maturities, Fair Value of Debt Securities |
|
|
|
|
|
|
|
Fair Value |
[8] |
16,600,000
|
|
16,600,000
|
|
|
84,700,000
|
Indiana Michigan Power Co [Member] | Cash and Cash Equivalents [Member] | Spent Nuclear Fuel and Decommissioning Trusts [Member] |
|
|
|
|
|
|
|
Nuclear Trust Fund Investments |
|
|
|
|
|
|
|
Gross Unrealized Gains |
|
|
|
0
|
|
|
0
|
Fair Value Measurements (Textuals) |
|
|
|
|
|
|
|
Other than Temporary Impairment Losses, Investments |
|
|
|
0
|
|
|
0
|
Indiana Michigan Power Co [Member] | US Government Agencies Debt Securities [Member] |
|
|
|
|
|
|
|
Nuclear Trust Fund Investments |
|
|
|
|
|
|
|
Fair Value |
|
1,139,500,000
|
|
1,139,500,000
|
|
|
1,156,400,000
|
Contractual Maturities, Fair Value of Debt Securities |
|
|
|
|
|
|
|
Fair Value |
|
1,139,500,000
|
|
1,139,500,000
|
|
|
1,156,400,000
|
Indiana Michigan Power Co [Member] | US Government Agencies Debt Securities [Member] | Spent Nuclear Fuel and Decommissioning Trusts [Member] |
|
|
|
|
|
|
|
Nuclear Trust Fund Investments |
|
|
|
|
|
|
|
Gross Unrealized Gains |
|
|
|
5,300,000
|
|
|
66,300,000
|
Fair Value Measurements (Textuals) |
|
|
|
|
|
|
|
Other than Temporary Impairment Losses, Investments |
|
|
|
(14,700,000)
|
|
|
(7,900,000)
|
Indiana Michigan Power Co [Member] | Corporate Debt [Member] |
|
|
|
|
|
|
|
Nuclear Trust Fund Investments |
|
|
|
|
|
|
|
Fair Value |
|
62,300,000
|
|
62,300,000
|
|
|
76,700,000
|
Contractual Maturities, Fair Value of Debt Securities |
|
|
|
|
|
|
|
Fair Value |
|
62,300,000
|
|
62,300,000
|
|
|
76,700,000
|
Indiana Michigan Power Co [Member] | Corporate Debt [Member] | Spent Nuclear Fuel and Decommissioning Trusts [Member] |
|
|
|
|
|
|
|
Nuclear Trust Fund Investments |
|
|
|
|
|
|
|
Gross Unrealized Gains |
|
|
|
(4,200,000)
|
|
|
6,700,000
|
Fair Value Measurements (Textuals) |
|
|
|
|
|
|
|
Other than Temporary Impairment Losses, Investments |
|
|
|
(6,000,000.0)
|
|
|
(2,100,000)
|
Indiana Michigan Power Co [Member] | State and Local Jurisdiction [Member] |
|
|
|
|
|
|
|
Nuclear Trust Fund Investments |
|
|
|
|
|
|
|
Fair Value |
|
7,100,000
|
|
7,100,000
|
|
|
7,300,000
|
Contractual Maturities, Fair Value of Debt Securities |
|
|
|
|
|
|
|
Fair Value |
|
7,100,000
|
|
7,100,000
|
|
|
7,300,000
|
Indiana Michigan Power Co [Member] | State and Local Jurisdiction [Member] | Spent Nuclear Fuel and Decommissioning Trusts [Member] |
|
|
|
|
|
|
|
Nuclear Trust Fund Investments |
|
|
|
|
|
|
|
Gross Unrealized Gains |
|
|
|
100,000
|
|
|
400,000
|
Fair Value Measurements (Textuals) |
|
|
|
|
|
|
|
Other than Temporary Impairment Losses, Investments |
|
|
|
(100,000)
|
|
|
(100,000)
|
Ohio Power Co [Member] |
|
|
|
|
|
|
|
Book Values and Fair Values of Long - term Debt |
|
|
|
|
|
|
|
Total Long-term Debt Outstanding |
|
2,969,400,000
|
|
2,969,400,000
|
|
|
2,968,500,000
|
Long Term Debt, Fair Value |
|
2,679,000,000
|
|
2,679,000,000
|
|
|
3,437,500,000
|
Public Service Co Of Oklahoma [Member] |
|
|
|
|
|
|
|
Book Values and Fair Values of Long - term Debt |
|
|
|
|
|
|
|
Total Long-term Debt Outstanding |
|
2,413,800,000
|
|
2,413,800,000
|
|
|
1,913,500,000
|
Long Term Debt, Fair Value |
|
2,236,200,000
|
|
2,236,200,000
|
|
|
2,163,700,000
|
Southwestern Electric Power Co [Member] |
|
|
|
|
|
|
|
Book Values and Fair Values of Long - term Debt |
|
|
|
|
|
|
|
Total Long-term Debt Outstanding |
|
3,393,400,000
|
|
3,393,400,000
|
|
|
3,395,200,000
|
Long Term Debt, Fair Value |
|
3,045,600,000
|
|
3,045,600,000
|
|
|
3,792,900,000
|
Risk Management Commodity Contracts [Member] |
|
|
|
|
|
|
|
Fair Value Measurements (Textuals) |
|
|
|
|
|
|
|
Liabilities Held for Sale |
|
|
|
|
|
|
100,000
|
Equity Units [Member] |
|
|
|
|
|
|
|
Book Values and Fair Values of Long - term Debt |
|
|
|
|
|
|
|
Long Term Debt, Fair Value |
|
923,000,000
|
|
923,000,000
|
|
|
1,700,000,000
|
Held For Sale |
|
|
|
|
|
|
|
Fair Value Measurements (Textuals) |
|
|
|
|
|
|
|
Liabilities Held for Sale |
|
1,100,000,000
|
|
1,100,000,000
|
|
|
1,100,000,000
|
Fair Value Held for Sale [Member] |
|
|
|
|
|
|
|
Fair Value Measurements (Textuals) |
|
|
|
|
|
|
|
Liabilities Held for Sale |
|
$ 1,100,000,000
|
|
$ 1,100,000,000
|
|
|
$ 1,200,000,000
|
|
|