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v3.23.1

Organization and Summary of Significant Accounting Policies (Details) - USD ($) $ / shares in Units, $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Materials and Supplies |  | $ 915.1 | $ 701.8 |  |
Supplementary Information |  |  |  |  |
Depreciation and Amortization of Property, Plant and Equipment |  | 3,072.8 | 2,717.1 | $ 2,487.5 |
Amortization of Certain Securitized Assets |  | 93.3 | 64.2 | 171.3 |
Amortization of Regulatory Assets and Liabilities |  | 36.7 | 44.4 | 24.0 |
Total Depreciation and Amortization |  | 3,202.8 | 2,825.7 | 2,682.8 |
Cash, Cash Equivalents and Restricted Cash |  |  |  |  |
Cash and Cash Equivalents at Beginning of Period |  | 403.4 |  |  |
Restricted Cash |  | 47.1 | 48.0 |  |
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents |  | 556.5 | 451.4 | 438.3 | $ 432.6
Amounts Attributable to AEP Common Shareholders |  |  |  |  |
Net Income (Loss) Attributable to Noncontrolling Interests |  | (1.6) | 0.0 | (3.4) |
Net Income (Loss) |  | $ 2,307.2 | $ 2,488.1 | $ 2,200.1 |
Weighted Average Number of Basic AEP Common Shares Outstanding |  | 511,841,946 | 500,522,177 | 495,718,223 |
Earnings Per Share, Basic |  | $ 4.51 | $ 4.97 | $ 4.44 |
Weighted Average Dilutive Effect of: |  |  |  |  |
Weighted Average Number of Diluted AEP Common Shares Outstanding |  | 513,484,609 | 501,784,032 | 497,226,867 |
Earnings Per Share, Diluted |  | $ 4.49 | $ 4.96 | $ 4.42 |
Revenues |  |  |  |  |
TOTAL REVENUES |  | $ 19,639.5 | $ 16,792.0 | $ 14,918.5 |
Expenses |  |  |  |  |
Depreciation and Amortization |  | 3,202.8 | 2,825.7 | 2,682.8 |
TOTAL EXPENSES |  | 16,156.8 | 13,380.7 | 11,930.8 |
OPERATING INCOME (LOSS) |  | 3,482.7 | 3,411.3 | 2,987.7 |
Other Income (Expense) |  |  |  |  |
Allowance for Equity Funds Used During Construction |  | 133.7 | 139.7 | 148.1 |
Interest Expense |  | (1,396.1) | (1,199.1) | (1,165.7) |
INCOME BEFORE INCOME TAX EXPENSE (BENEFIT) AND EQUITY EARNINGS (LOSS) |  | 2,420.4 | 2,511.9 | 2,146.1 |
Income Tax Expense/Benefit |  | 5.4 | 115.5 | 40.5 |
Net Income (Loss) |  | 2,305.6 | 2,488.1 | 2,196.7 |
Accounts Receivable: |  |  |  |  |
Customers |  | 1,145.1 | 737.4 |  |
Total Accounts Receivable |  | 2,668.0 | 1,974.9 |  |
Accrued Tax Benefits |  | 99.4 | 121.5 |  |
TOTAL CURRENT ASSETS |  | 6,775.5 | 4,984.4 |  |
Property, Plant and Equipment |  |  |  |  |
Transmission |  | 33,266.9 | 30,816.3 |  |
Other Property, Plant and Equipment |  | 5,971.8 | 5,844.9 |  |
Construction Work in Progress |  | 4,809.7 | 3,786.8 |  |
Total Property, Plant and Equipment |  | 97,021.4 | 90,225.0 |  |
Accumulated Depreciation and Amortization |  | 23,682.3 | 21,920.9 |  |
TOTAL PROPERTY, PLANT AND EQUIPMENT - NET |  | 73,339.1 | 68,304.1 |  |
Other Noncurrent Assets |  |  |  |  |
TOTAL OTHER NONCURRENT ASSETS |  | 13,288.7 | 14,380.2 |  |
TOTAL ASSETS |  | 93,403.3 | 87,668.7 |  |
Current Liabilities |  |  |  |  |
Accounts Payable |  | 2,670.8 | 2,108.0 |  |
Accrued Taxes |  | 1,714.6 | 1,631.3 |  |
TOTAL CURRENT LIABILITIES |  | 13,266.3 | 10,906.4 |  |
Liabilities, Noncurrent |  |  |  |  |
Regulatory Liabilities and Deferred Investment Tax Credits |  | 8,115.6 | 8,834.4 |  |
TOTAL NONCURRENT LIABILITIES |  | 55,968.7 | 54,038.8 |  |
TOTAL LIABILITIES |  | 69,235.0 | 64,945.2 |  |
Equity [Abstract] |  |  |  |  |
Retained Earnings |  | 12,345.6 | 11,667.1 |  |
TOTAL LIABILITIES AND EQUITY |  | 93,403.3 | 87,668.7 |  |
Operating Activites |  |  |  |  |
Net Income (Loss) |  | 2,305.6 | 2,488.1 | 2,196.7 |
Adjustments to Reconcile Net Income to Net Cash Flows from (Used for) Operating Activities: |  |  |  |  |
Depreciation and Amortization |  | 3,202.8 | 2,825.7 | 2,682.8 |
Deferred Income Taxes |  | (137.2) | 107.6 | 196.1 |
Allowance for Equity Funds Used During Construction |  | (133.7) | (139.7) | (148.1) |
Amortization of Deferred Property Taxes |  | (41.2) | (68.0) | (43.3) |
Change in Other Noncurrent Assets |  | (187.7) | (126.6) | (151.0) |
Increase (Decrease) in Other Noncurrent Liabilities |  | 337.8 | 206.4 | (54.5) |
Accounts Receivable, Net |  | (681.7) | (119.7) | (129.3) |
Accounts Payable |  | 489.2 | 200.6 | (35.3) |
Accrued Taxes, Net |  | 105.4 | 218.7 | 20.1 |
Net Cash Flows from Operating Activities |  | 5,288.0 | 3,839.9 | 3,832.9 |
Investing Activities |  |  |  |  |
Net Cash Flows Used for Investing Activities |  | (7,751.8) | (6,433.9) | (6,233.9) |
Net Cash Provided by (Used in) Financing Activities |  |  |  |  |
Net Cash Flows from Financing Activities |  | 2,568.9 | 2,607.1 | 2,406.7 |
Cash and Cash Equivalents at Beginning of Period |  | 403.4 |  |  |
Cash and Cash Equivalents at End of Period |  | 509.4 | 403.4 |  |
Cash Paid (Received) for: |  |  |  |  |
Cash Paid for Interest, Net of Capitalized Amounts |  | 1,286.3 | 1,137.2 | 1,029.1 |
Income Taxes |  | 116.8 | 13.2 | (49.1) |
Noncash Investing and Financing Activities: |  |  |  |  |
Noncash Acquisition Under Finance Leases |  | 31.8 | 287.6 | 44.2 |
Construction in Progress Expenditures Incurred but Not yet Paid |  | 1,258.9 | 1,180.4 | 975.4 |
Construction Expenditures Included in Current Liabilities as of December 31, |  | 1,258.9 | 1,180.4 | 975.4 |
Construction Expenditures Included in Noncurrent Liabilities as of December 31, |  | 0.0 | 0.0 | 5.5 |
Acquisition of Nuclear Fuel Included in Current Liabilities as of December 31, |  | 0.0 | 0.0 | 33.4 |
Forward Equity Purchase Contracts Included in Current and Noncurrent Liabilities as of December 31, |  | 56.4 | 47.8 | (86.2) |
Organization and Summary of Significant Accounting Policies (Textuals) |  |  |  |  |
Issuance of Long-term Debt |  | 4,649.7 | 6,486.3 | 5,626.1 |
Repayments of Long-term Debt |  | $ 2,345.4 | 2,989.3 | 1,339.8 |
Equity Method Investment, Ownership Percentage |  | 50.00% |  |  |
Equity Method Investment |  | $ 1,276.7 | 1,447.5 | 1,406.3 |
Income (Loss) from Equity Method Investment |  | $ (109.4) | $ 91.7 | $ 91.1 |
Antidilutive Shares Outstanding |  | 0 | 0 | 128,000 |
Net Income (Loss) |  | $ 2,305.6 | $ 2,488.1 | $ 2,196.7 |
Retained Earnings |  | 12,345.6 | 11,667.1 |  |
2020 Equity Units [Member] |  |  |  |  |
Noncash Investing and Financing Activities: |  |  |  |  |
Forward Equity Purchase Contracts Included in Current and Noncurrent Liabilities as of December 31, |  | 0.0 | 0.0 | 110.6 |
Cedar Creek Project |  |  |  |  |
Noncash Investing and Financing Activities: |  |  |  |  |
Noncash Contribution of Assets to Cedar Creek Project |  | 0.0 | (9.3) | 0.0 |
Retained Earnings [Member] |  |  |  |  |
Amounts Attributable to AEP Common Shareholders |  |  |  |  |
Net Income (Loss) |  | 2,307.2 | 2,488.1 | 2,200.1 |
Noncash Investing and Financing Activities: |  |  |  |  |
Forward Equity Purchase Contracts Included in Current and Noncurrent Liabilities as of December 31, |  |  | (1.1) |  |
Berkshire Hathaway [Member] |  |  |  |  |
Organization and Summary of Significant Accounting Policies (Textuals) |  |  |  |  |
Equity Method Investment, Ownership Percentage |  | 50.00% |  |  |
AEP Transmission Holdco [Member] |  |  |  |  |
Organization and Summary of Significant Accounting Policies (Textuals) |  |  |  |  |
Equity Method Investment, Ownership Percentage |  | 50.00% |  |  |
Pension Plans [Member] | Equity [Member] |  |  |  |  |
Target Asset Allocations |  |  |  |  |
Target Asset Allocation |  | 30.00% |  |  |
Pension Plans [Member] | Fixed Income [Member] |  |  |  |  |
Target Asset Allocations |  |  |  |  |
Target Asset Allocation |  | 54.00% |  |  |
Pension Plans [Member] | Other Investments [Member] |  |  |  |  |
Target Asset Allocations |  |  |  |  |
Target Asset Allocation |  | 15.00% |  |  |
Pension Plans [Member] | Cash and Cash Equivalents [Member] |  |  |  |  |
Target Asset Allocations |  |  |  |  |
Target Asset Allocation |  | 1.00% |  |  |
Other Postretirement Benefit Plans [Member] | Equity [Member] |  |  |  |  |
Target Asset Allocations |  |  |  |  |
Target Asset Allocation |  | 59.00% |  |  |
Other Postretirement Benefit Plans [Member] | Fixed Income [Member] |  |  |  |  |
Target Asset Allocations |  |  |  |  |
Target Asset Allocation |  | 40.00% |  |  |
Other Postretirement Benefit Plans [Member] | Cash and Cash Equivalents [Member] |  |  |  |  |
Target Asset Allocations |  |  |  |  |
Target Asset Allocation |  | 1.00% |  |  |
Pension and Other Postretirement Benefit Plans [Member] |  |  |  |  |
Supplementary Information |  |  |  |  |
Securities Loaned |  | $ 83.0 | 137.0 |  |
AEP Texas Inc. [Member] |  |  |  |  |
Materials and Supplies |  | 138.8 | 73.9 |  |
Supplementary Information |  |  |  |  |
Depreciation and Amortization of Property, Plant and Equipment |  | 363.5 | 327.2 | 364.2 |
Amortization of Certain Securitized Assets |  | 93.3 | 64.2 | 171.3 |
Amortization of Regulatory Assets and Liabilities |  | (4.4) | (4.4) | (5.7) |
Total Depreciation and Amortization |  | 452.4 | 387.0 | 529.8 |
Cash, Cash Equivalents and Restricted Cash |  |  |  |  |
Cash and Cash Equivalents at Beginning of Period |  | 0.1 |  |  |
Restricted Cash |  | 32.7 | 30.4 |  |
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents |  | 32.8 | 30.5 | 28.8 | 157.8
Revenues |  |  |  |  |
TOTAL REVENUES |  | 1,846.8 | 1,593.8 | 1,618.9 |
Expenses |  |  |  |  |
Depreciation and Amortization |  | 452.4 | 387.0 | 529.8 |
TOTAL EXPENSES |  | 1,297.6 | 1,117.8 | 1,249.3 |
OPERATING INCOME (LOSS) |  | 549.2 | 476.0 | 369.6 |
Other Income (Expense) |  |  |  |  |
Allowance for Equity Funds Used During Construction |  | 19.7 | 21.5 | 19.4 |
Interest Expense |  | (208.7) | (176.5) | (171.8) |
INCOME BEFORE INCOME TAX EXPENSE (BENEFIT) AND EQUITY EARNINGS (LOSS) |  | 380.5 | 332.9 | 229.8 |
Income Tax Expense/Benefit |  | 72.6 | 43.1 | (11.2) |
Net Income (Loss) |  | 307.9 | 289.8 | 241.0 |
Accounts Receivable: |  |  |  |  |
Customers |  | 150.9 | 123.4 |  |
Total Accounts Receivable |  | 250.2 | 205.2 |  |
Accrued Tax Benefits |  | 12.2 | 24.8 |  |
TOTAL CURRENT ASSETS |  | 446.9 | 347.2 |  |
Property, Plant and Equipment |  |  |  |  |
Transmission |  | 6,301.5 | 5,849.9 |  |
Other Property, Plant and Equipment |  | 1,022.8 | 961.1 |  |
Construction Work in Progress |  | 805.2 | 551.3 |  |
Total Property, Plant and Equipment |  | 13,442.3 | 12,279.5 |  |
Accumulated Depreciation and Amortization |  | 1,760.7 | 1,644.1 |  |
TOTAL PROPERTY, PLANT AND EQUIPMENT - NET |  | 11,681.6 | 10,635.4 |  |
Other Noncurrent Assets |  |  |  |  |
TOTAL OTHER NONCURRENT ASSETS |  | 763.7 | 854.1 |  |
TOTAL ASSETS |  | 12,892.2 | 11,836.7 |  |
Current Liabilities |  |  |  |  |
Accounts Payable |  | 331.0 | 306.3 |  |
Affiliated Companies |  | 34.7 | 32.5 |  |
Accrued Taxes |  | 95.5 | 93.3 |  |
TOTAL CURRENT LIABILITIES |  | 1,043.8 | 1,311.7 |  |
Liabilities, Noncurrent |  |  |  |  |
Regulatory Liabilities and Deferred Investment Tax Credits |  | 1,259.6 | 1,242.0 |  |
TOTAL NONCURRENT LIABILITIES |  | 7,944.1 | 6,930.8 |  |
TOTAL LIABILITIES |  | 8,987.9 | 8,242.5 |  |
Equity [Abstract] |  |  |  |  |
Retained Earnings |  | 2,354.7 | 2,046.8 |  |
TOTAL LIABILITIES AND EQUITY |  | 12,892.2 | 11,836.7 |  |
Operating Activites |  |  |  |  |
Net Income (Loss) |  | 307.9 | 289.8 | 241.0 |
Adjustments to Reconcile Net Income to Net Cash Flows from (Used for) Operating Activities: |  |  |  |  |
Depreciation and Amortization |  | 452.4 | 387.0 | 529.8 |
Deferred Income Taxes |  | 42.2 | 43.0 | (15.2) |
Allowance for Equity Funds Used During Construction |  | (19.7) | (21.5) | (19.4) |
Change in Other Noncurrent Assets |  | (36.2) | (78.2) | (74.0) |
Increase (Decrease) in Other Noncurrent Liabilities |  | 57.6 | 26.4 | (24.7) |
Accounts Receivable, Net |  | (45.0) | (21.6) | 9.8 |
Accounts Payable |  | 25.0 | 8.9 | 30.2 |
Accrued Taxes, Net |  | 14.8 | 7.0 | 42.7 |
Net Cash Flows from Operating Activities |  | 731.9 | 596.6 | 614.2 |
Investing Activities |  |  |  |  |
Net Cash Flows Used for Investing Activities |  | (1,269.9) | (1,000.8) | (1,065.4) |
Net Cash Provided by (Used in) Financing Activities |  |  |  |  |
Net Cash Flows from Financing Activities |  | 540.3 | 405.9 | 322.2 |
Cash and Cash Equivalents at Beginning of Period |  | 0.1 |  |  |
Cash and Cash Equivalents at End of Period |  | 0.1 | 0.1 |  |
Cash Paid (Received) for: |  |  |  |  |
Cash Paid for Interest, Net of Capitalized Amounts |  | 198.9 | 168.9 | 153.2 |
Income Taxes |  | 11.0 | 5.7 | (42.9) |
Noncash Investing and Financing Activities: |  |  |  |  |
Construction in Progress Expenditures Incurred but Not yet Paid |  | 235.4 | 230.0 | 177.8 |
Construction Expenditures Included in Current Liabilities as of December 31, |  | 235.4 | 230.0 | 177.8 |
Organization and Summary of Significant Accounting Policies (Textuals) |  |  |  |  |
Issuance of Long-term Debt |  | 1,188.6 | 444.2 | 652.7 |
Repayments of Long-term Debt |  | 716.0 | 88.7 | 392.1 |
Net Income (Loss) |  | 307.9 | 289.8 | 241.0 |
Retained Earnings |  | 2,354.7 | 2,046.8 |  |
AEP Texas Inc. [Member] | Retained Earnings [Member] |  |  |  |  |
Other Income (Expense) |  |  |  |  |
Net Income (Loss) |  | 307.9 | 289.8 | 241.0 |
Operating Activites |  |  |  |  |
Net Income (Loss) |  | 307.9 | 289.8 | 241.0 |
Organization and Summary of Significant Accounting Policies (Textuals) |  |  |  |  |
Net Income (Loss) |  | $ 307.9 | 289.8 | 241.0 |
AEP Texas Inc. [Member] | Pension Plans [Member] | Equity [Member] |  |  |  |  |
Target Asset Allocations |  |  |  |  |
Target Asset Allocation |  | 30.00% |  |  |
AEP Texas Inc. [Member] | Pension Plans [Member] | Fixed Income [Member] |  |  |  |  |
Target Asset Allocations |  |  |  |  |
Target Asset Allocation |  | 54.00% |  |  |
AEP Texas Inc. [Member] | Pension Plans [Member] | Other Investments [Member] |  |  |  |  |
Target Asset Allocations |  |  |  |  |
Target Asset Allocation |  | 15.00% |  |  |
AEP Texas Inc. [Member] | Pension Plans [Member] | Cash and Cash Equivalents [Member] |  |  |  |  |
Target Asset Allocations |  |  |  |  |
Target Asset Allocation |  | 1.00% |  |  |
AEP Texas Inc. [Member] | Other Postretirement Benefit Plans [Member] | Equity [Member] |  |  |  |  |
Target Asset Allocations |  |  |  |  |
Target Asset Allocation |  | 59.00% |  |  |
AEP Texas Inc. [Member] | Other Postretirement Benefit Plans [Member] | Fixed Income [Member] |  |  |  |  |
Target Asset Allocations |  |  |  |  |
Target Asset Allocation |  | 40.00% |  |  |
AEP Texas Inc. [Member] | Other Postretirement Benefit Plans [Member] | Cash and Cash Equivalents [Member] |  |  |  |  |
Target Asset Allocations |  |  |  |  |
Target Asset Allocation |  | 1.00% |  |  |
AEP Texas Inc. [Member] | Pension and Other Postretirement Benefit Plans [Member] |  |  |  |  |
Supplementary Information |  |  |  |  |
Securities Loaned |  | $ 83.0 | 137.0 |  |
AEP Transmission Co [Member] |  |  |  |  |
Materials and Supplies |  | 10.7 | 9.3 |  |
Supplementary Information |  |  |  |  |
Depreciation and Amortization of Property, Plant and Equipment |  | 346.2 | 297.3 | 249.0 |
Amortization of Certain Securitized Assets |  | 0.0 | 0.0 | 0.0 |
Amortization of Regulatory Assets and Liabilities |  | 0.0 | 0.0 | 0.0 |
Total Depreciation and Amortization |  | 346.2 | 297.3 | 249.0 |
Cash, Cash Equivalents and Restricted Cash |  |  |  |  |
Cash and Cash Equivalents at Beginning of Period |  | 0.0 | 0.0 | 0.0 |
Revenues |  |  |  |  |
TOTAL REVENUES |  | 1,624.5 | 1,469.3 | 1,145.7 |
Expenses |  |  |  |  |
Depreciation and Amortization |  | 346.2 | 297.3 | 249.0 |
TOTAL EXPENSES |  | 770.8 | 660.0 | 564.2 |
OPERATING INCOME (LOSS) |  | 853.7 | 809.3 | 581.5 |
Other Income (Expense) |  |  |  |  |
Allowance for Equity Funds Used During Construction |  | 70.7 | 67.2 | 74.0 |
Interest Expense |  | (162.7) | (141.2) | (127.8) |
INCOME BEFORE INCOME TAX EXPENSE (BENEFIT) AND EQUITY EARNINGS (LOSS) |  | 763.3 | 735.8 | 530.1 |
Income Tax Expense/Benefit |  | 169.1 | 144.1 | 106.7 |
Net Income (Loss) |  | 594.2 | 591.7 | 423.4 |
Accounts Receivable: |  |  |  |  |
Customers |  | 46.9 | 22.8 |  |
Total Accounts Receivable |  | 166.4 | 120.1 |  |
Accrued Tax Benefits |  | 4.2 | 5.6 |  |
TOTAL CURRENT ASSETS |  | 188.7 | 165.0 |  |
Property, Plant and Equipment |  |  |  |  |
Transmission |  | 12,335.4 | 11,031.0 |  |
Other Property, Plant and Equipment |  | 476.8 | 451.9 |  |
Construction Work in Progress |  | 1,554.7 | 1,402.2 |  |
Total Property, Plant and Equipment |  | 14,366.9 | 12,885.1 |  |
Accumulated Depreciation and Amortization |  | 1,027.0 | 784.1 |  |
TOTAL PROPERTY, PLANT AND EQUIPMENT - NET |  | 13,339.9 | 12,101.0 |  |
Other Noncurrent Assets |  |  |  |  |
Deferred Property Taxes |  | 266.6 | 245.7 |  |
TOTAL OTHER NONCURRENT ASSETS |  | 285.6 | 258.4 |  |
TOTAL ASSETS |  | 13,814.2 | 12,524.4 |  |
Current Liabilities |  |  |  |  |
Accounts Payable |  | 427.8 | 460.7 |  |
Affiliated Companies |  | 82.7 | 70.4 |  |
Accrued Taxes |  | 529.8 | 481.0 |  |
TOTAL CURRENT LIABILITIES |  | 1,368.0 | 1,273.9 |  |
Liabilities, Noncurrent |  |  |  |  |
Regulatory Liabilities and Deferred Investment Tax Credits |  | 723.3 | 651.7 |  |
TOTAL NONCURRENT LIABILITIES |  | 6,573.2 | 5,874.4 |  |
TOTAL LIABILITIES |  | 7,941.2 | 7,148.3 |  |
Equity [Abstract] |  |  |  |  |
Retained Earnings |  | 2,850.7 | 2,426.5 |  |
TOTAL MEMBER'S EQUITY |  | 5,873.0 | 5,376.1 | 4,712.9 | 4,009.5
TOTAL LIABILITIES AND EQUITY |  | 13,814.2 | 12,524.4 |  |
Operating Activites |  |  |  |  |
Net Income (Loss) |  | 594.2 | 591.7 | 423.4 |
Adjustments to Reconcile Net Income to Net Cash Flows from (Used for) Operating Activities: |  |  |  |  |
Depreciation and Amortization |  | 346.2 | 297.3 | 249.0 |
Deferred Income Taxes |  | 62.3 | 68.5 | 81.6 |
Allowance for Equity Funds Used During Construction |  | (70.7) | (67.2) | (74.0) |
Amortization of Deferred Property Taxes |  | (20.9) | (25.6) | (26.6) |
Change in Other Noncurrent Assets |  | (7.4) | 7.5 | (8.2) |
Increase (Decrease) in Other Noncurrent Liabilities |  | 68.7 | 3.7 | 8.3 |
Accounts Receivable, Net |  | (46.3) | (16.0) | (19.0) |
Accounts Payable |  | 18.5 | (2.2) | 77.8 |
Accrued Taxes, Net |  | 50.2 | 67.2 | 62.7 |
Net Cash Flows from Operating Activities |  | 995.3 | 925.7 | 771.2 |
Investing Activities |  |  |  |  |
Net Cash Flows Used for Investing Activities |  | (1,439.2) | (1,359.0) | (1,640.4) |
Net Cash Provided by (Used in) Financing Activities |  |  |  |  |
Net Cash Flows from Financing Activities |  | 443.9 | 433.3 | 869.2 |
Cash and Cash Equivalents at Beginning of Period |  | 0.0 | 0.0 | 0.0 |
Cash and Cash Equivalents at End of Period |  | 0.0 | 0.0 | 0.0 |
Cash Paid (Received) for: |  |  |  |  |
Cash Paid for Interest, Net of Capitalized Amounts |  | 158.8 | 132.9 | 119.7 |
Income Taxes |  | 95.5 | 65.7 | 22.9 |
Noncash Investing and Financing Activities: |  |  |  |  |
Construction in Progress Expenditures Incurred but Not yet Paid |  | 320.7 | 358.7 | 311.9 |
Construction Expenditures Included in Current Liabilities as of December 31, |  | 320.7 | 358.7 | 311.9 |
Organization and Summary of Significant Accounting Policies (Textuals) |  |  |  |  |
Issuance of Long-term Debt |  | 540.8 | 443.7 | 519.5 |
Repayments of Long-term Debt |  | 104.0 | 50.0 | 0.0 |
Net Income (Loss) |  | 594.2 | 591.7 | 423.4 |
Retained Earnings |  | 2,850.7 | 2,426.5 |  |
AEP Transmission Co [Member] | Retained Earnings [Member] |  |  |  |  |
Other Income (Expense) |  |  |  |  |
Net Income (Loss) |  | 594.2 | 591.7 | 423.4 |
Equity [Abstract] |  |  |  |  |
TOTAL MEMBER'S EQUITY |  | 2,850.7 | 2,426.5 | 1,947.3 | 1,528.9
Operating Activites |  |  |  |  |
Net Income (Loss) |  | 594.2 | 591.7 | 423.4 |
Organization and Summary of Significant Accounting Policies (Textuals) |  |  |  |  |
Net Income (Loss) |  | 594.2 | 591.7 | 423.4 |
Appalachian Power Co [Member] |  |  |  |  |
Materials and Supplies |  | 130.6 | 109.8 |  |
Supplementary Information |  |  |  |  |
Depreciation and Amortization of Property, Plant and Equipment |  | 576.1 | 547.0 | 507.8 |
Amortization of Certain Securitized Assets |  | 0.0 | 0.0 | 0.0 |
Amortization of Regulatory Assets and Liabilities |  | (0.2) | (0.8) | (0.3) |
Total Depreciation and Amortization |  | 575.9 | 546.2 | 507.5 |
Cash, Cash Equivalents and Restricted Cash |  |  |  |  |
Cash and Cash Equivalents at Beginning of Period |  | 2.5 |  |  |
Restricted Cash |  | 14.4 | 17.6 |  |
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents |  | 21.9 | 20.1 | 22.7 | 26.8
Revenues |  |  |  |  |
TOTAL REVENUES |  | 3,519.9 | 3,105.2 | 2,796.2 |
Expenses |  |  |  |  |
Depreciation and Amortization |  | 575.9 | 546.2 | 507.5 |
TOTAL EXPENSES |  | 2,917.8 | 2,555.8 | 2,239.6 |
OPERATING INCOME (LOSS) |  | 602.1 | 549.4 | 556.6 |
Other Income (Expense) |  |  |  |  |
Allowance for Equity Funds Used During Construction |  | 11.7 | 15.6 | 14.6 |
Interest Expense |  | (233.9) | (214.0) | (217.6) |
INCOME BEFORE INCOME TAX EXPENSE (BENEFIT) AND EQUITY EARNINGS (LOSS) |  | 412.4 | 371.0 | 374.0 |
Income Tax Expense/Benefit |  | 18.2 | 22.1 | 4.3 |
Net Income (Loss) |  | 394.2 | 348.9 | 369.7 |
Accounts Receivable: |  |  |  |  |
Customers |  | 168.9 | 158.5 |  |
Total Accounts Receivable |  | 352.8 | 341.0 |  |
TOTAL CURRENT ASSETS |  | 1,259.6 | 925.3 |  |
Property, Plant and Equipment |  |  |  |  |
Transmission |  | 4,482.8 | 4,322.4 |  |
Other Property, Plant and Equipment |  | 883.3 | 696.6 |  |
Construction Work in Progress |  | 705.3 | 469.9 |  |
Total Property, Plant and Equipment |  | 17,781.2 | 16,856.1 |  |
Accumulated Depreciation and Amortization |  | 5,402.0 | 5,051.8 |  |
TOTAL PROPERTY, PLANT AND EQUIPMENT - NET |  | 12,379.2 | 11,804.3 |  |
Other Noncurrent Assets |  |  |  |  |
TOTAL OTHER NONCURRENT ASSETS |  | 1,583.4 | 1,359.3 |  |
TOTAL ASSETS |  | 15,222.2 | 14,088.9 |  |
Current Liabilities |  |  |  |  |
Accounts Payable |  | 451.2 | 262.2 |  |
Affiliated Companies |  | 142.7 | 118.6 |  |
Accrued Taxes |  | 101.0 | 119.7 |  |
TOTAL CURRENT LIABILITIES |  | 1,390.2 | 1,415.9 |  |
Liabilities, Noncurrent |  |  |  |  |
Regulatory Liabilities and Deferred Investment Tax Credits |  | 1,143.6 | 1,238.8 |  |
TOTAL NONCURRENT LIABILITIES |  | 8,856.6 | 8,025.1 |  |
TOTAL LIABILITIES |  | 10,246.8 | 9,441.0 |  |
Equity [Abstract] |  |  |  |  |
Retained Earnings |  | 2,891.1 | 2,534.4 |  |
TOTAL LIABILITIES AND EQUITY |  | 15,222.2 | 14,088.9 |  |
Operating Activites |  |  |  |  |
Net Income (Loss) |  | 394.2 | 348.9 | 369.7 |
Adjustments to Reconcile Net Income to Net Cash Flows from (Used for) Operating Activities: |  |  |  |  |
Depreciation and Amortization |  | 575.9 | 546.2 | 507.5 |
Deferred Income Taxes |  | 79.6 | 15.0 | (26.2) |
Allowance for Equity Funds Used During Construction |  | (11.7) | (15.6) | (14.6) |
Change in Other Noncurrent Assets |  | (75.2) | (68.8) | (40.4) |
Increase (Decrease) in Other Noncurrent Liabilities |  | 31.4 | 35.6 | 11.2 |
Accounts Receivable, Net |  | (8.5) | (53.3) | (30.2) |
Accounts Payable |  | 190.1 | 36.8 | (48.1) |
Accrued Taxes, Net |  | 6.7 | (16.2) | 31.3 |
Net Cash Flows from Operating Activities |  | 601.2 | 611.7 | 712.0 |
Investing Activities |  |  |  |  |
Net Cash Flows Used for Investing Activities |  | (1,005.2) | (826.5) | (757.9) |
Net Cash Provided by (Used in) Financing Activities |  |  |  |  |
Net Cash Flows from Financing Activities |  | 405.8 | 212.2 | 41.8 |
Cash and Cash Equivalents at Beginning of Period |  | 2.5 |  |  |
Cash and Cash Equivalents at End of Period |  | 7.5 | 2.5 |  |
Cash Paid (Received) for: |  |  |  |  |
Cash Paid for Interest, Net of Capitalized Amounts |  | 215.1 | 207.5 | 207.1 |
Income Taxes |  | (88.6) | 32.8 | 0.0 |
Noncash Investing and Financing Activities: |  |  |  |  |
Construction in Progress Expenditures Incurred but Not yet Paid |  | 164.6 | 139.1 | 105.6 |
Construction Expenditures Included in Current Liabilities as of December 31, |  | 164.6 | 139.1 | 105.6 |
Organization and Summary of Significant Accounting Policies (Textuals) |  |  |  |  |
Issuance of Long-term Debt |  | 698.0 | 494.0 | 606.9 |
Repayments of Long-term Debt |  | 230.4 | 393.0 | 140.3 |
Net Income (Loss) |  | 394.2 | 348.9 | 369.7 |
Retained Earnings |  | 2,891.1 | 2,534.4 |  |
Appalachian Power Co [Member] | Retained Earnings [Member] |  |  |  |  |
Other Income (Expense) |  |  |  |  |
Net Income (Loss) |  | 394.2 | 348.9 | 369.7 |
Operating Activites |  |  |  |  |
Net Income (Loss) |  | 394.2 | 348.9 | 369.7 |
Organization and Summary of Significant Accounting Policies (Textuals) |  |  |  |  |
Net Income (Loss) |  | $ 394.2 | 348.9 | 369.7 |
Appalachian Power Co [Member] | Pension Plans [Member] | Equity [Member] |  |  |  |  |
Target Asset Allocations |  |  |  |  |
Target Asset Allocation |  | 30.00% |  |  |
Appalachian Power Co [Member] | Pension Plans [Member] | Fixed Income [Member] |  |  |  |  |
Target Asset Allocations |  |  |  |  |
Target Asset Allocation |  | 54.00% |  |  |
Appalachian Power Co [Member] | Pension Plans [Member] | Other Investments [Member] |  |  |  |  |
Target Asset Allocations |  |  |  |  |
Target Asset Allocation |  | 15.00% |  |  |
Appalachian Power Co [Member] | Pension Plans [Member] | Cash and Cash Equivalents [Member] |  |  |  |  |
Target Asset Allocations |  |  |  |  |
Target Asset Allocation |  | 1.00% |  |  |
Appalachian Power Co [Member] | Other Postretirement Benefit Plans [Member] | Equity [Member] |  |  |  |  |
Target Asset Allocations |  |  |  |  |
Target Asset Allocation |  | 59.00% |  |  |
Appalachian Power Co [Member] | Other Postretirement Benefit Plans [Member] | Fixed Income [Member] |  |  |  |  |
Target Asset Allocations |  |  |  |  |
Target Asset Allocation |  | 40.00% |  |  |
Appalachian Power Co [Member] | Other Postretirement Benefit Plans [Member] | Cash and Cash Equivalents [Member] |  |  |  |  |
Target Asset Allocations |  |  |  |  |
Target Asset Allocation |  | 1.00% |  |  |
Appalachian Power Co [Member] | Pension and Other Postretirement Benefit Plans [Member] |  |  |  |  |
Supplementary Information |  |  |  |  |
Securities Loaned |  | $ 83.0 | 137.0 |  |
Indiana Michigan Power Co [Member] |  |  |  |  |
Materials and Supplies |  | 188.1 | 175.2 |  |
Supplementary Information |  |  |  |  |
Depreciation and Amortization of Property, Plant and Equipment |  | 511.9 | 424.9 | 393.3 |
Amortization of Certain Securitized Assets |  | 0.0 | 0.0 | 0.0 |
Amortization of Regulatory Assets and Liabilities |  | 15.3 | 21.1 | 18.3 |
Total Depreciation and Amortization |  | 527.2 | 446.0 | 411.6 |
Ohio Valley Electric Corporation - Barging and Other Transportation Services (43.47% Owned) |  | 54.3 | 54.0 | 60.8 |
Cash, Cash Equivalents and Restricted Cash |  |  |  |  |
Cash and Cash Equivalents at Beginning of Period |  | 1.3 | 3.3 | 2.0 |
Revenues |  |  |  |  |
TOTAL REVENUES |  | 2,669.6 | 2,326.7 | 2,241.8 |
Expenses |  |  |  |  |
Depreciation and Amortization |  | 527.2 | 446.0 | 411.6 |
TOTAL EXPENSES |  | 2,249.7 | 1,968.8 | 1,878.9 |
OPERATING INCOME (LOSS) |  | 419.9 | 357.9 | 362.9 |
Other Income (Expense) |  |  |  |  |
Allowance for Equity Funds Used During Construction |  | 9.8 | 12.8 | 11.5 |
Interest Expense |  | (125.2) | (116.8) | (112.3) |
INCOME BEFORE INCOME TAX EXPENSE (BENEFIT) AND EQUITY EARNINGS (LOSS) |  | 328.9 | 269.2 | 277.3 |
Income Tax Expense/Benefit |  | 4.2 | (10.6) | (7.5) |
Net Income (Loss) |  | 324.7 | 279.8 | 284.8 |
Accounts Receivable: |  |  |  |  |
Customers |  | 96.6 | 40.6 |  |
Total Accounts Receivable |  | 205.8 | 121.2 |  |
TOTAL CURRENT ASSETS |  | 571.8 | 439.4 |  |
Property, Plant and Equipment |  |  |  |  |
Transmission |  | 1,842.2 | 1,783.1 |  |
Other Property, Plant and Equipment |  | 839.3 | 792.9 |  |
Construction Work in Progress |  | 253.0 | 302.8 |  |
Total Property, Plant and Equipment |  | 11,544.3 | 11,210.7 |  |
Accumulated Depreciation and Amortization |  | 4,132.8 | 3,899.8 |  |
TOTAL PROPERTY, PLANT AND EQUIPMENT - NET |  | 7,411.5 | 7,310.9 |  |
Other Noncurrent Assets |  |  |  |  |
TOTAL OTHER NONCURRENT ASSETS |  | 4,135.6 | 4,657.9 |  |
TOTAL ASSETS |  | 12,118.9 | 12,408.2 |  |
Current Liabilities |  |  |  |  |
Accounts Payable |  | 173.4 | 174.4 |  |
Affiliated Companies |  | 121.5 | 94.9 |  |
Accrued Taxes |  | 103.2 | 106.5 |  |
TOTAL CURRENT LIABILITIES |  | 1,197.1 | 894.0 |  |
Liabilities, Noncurrent |  |  |  |  |
Regulatory Liabilities and Deferred Investment Tax Credits |  | 1,702.2 | 2,447.9 |  |
TOTAL NONCURRENT LIABILITIES |  | 7,913.5 | 8,729.5 |  |
TOTAL LIABILITIES |  | 9,110.6 | 9,623.5 |  |
Equity [Abstract] |  |  |  |  |
Retained Earnings |  | 1,963.2 | 1,748.5 |  |
TOTAL LIABILITIES AND EQUITY |  | 12,118.9 | 12,408.2 |  |
Operating Activites |  |  |  |  |
Net Income (Loss) |  | 324.7 | 279.8 | 284.8 |
Adjustments to Reconcile Net Income to Net Cash Flows from (Used for) Operating Activities: |  |  |  |  |
Depreciation and Amortization |  | 527.2 | 446.0 | 411.6 |
Deferred Income Taxes |  | (45.1) | (38.0) | (16.2) |
Allowance for Equity Funds Used During Construction |  | (9.8) | (12.8) | (11.5) |
Change in Other Noncurrent Assets |  | (47.3) | (54.1) | 6.1 |
Increase (Decrease) in Other Noncurrent Liabilities |  | 62.4 | 7.5 | 45.0 |
Accounts Receivable, Net |  | (82.7) | (22.3) | 14.5 |
Accounts Payable |  | 37.3 | 42.3 | (10.8) |
Accrued Taxes, Net |  | 9.4 | 1.6 | (20.2) |
Net Cash Flows from Operating Activities |  | 720.7 | 733.7 | 776.3 |
Investing Activities |  |  |  |  |
Net Cash Flows Used for Investing Activities |  | (701.5) | (633.1) | (648.9) |
Net Cash Provided by (Used in) Financing Activities |  |  |  |  |
Net Cash Flows from Financing Activities |  | (16.3) | (102.6) | (126.1) |
Cash and Cash Equivalents at Beginning of Period |  | 1.3 | 3.3 | 2.0 |
Cash and Cash Equivalents at End of Period |  | 4.2 | 1.3 | 3.3 |
Cash Paid (Received) for: |  |  |  |  |
Cash Paid for Interest, Net of Capitalized Amounts |  | 120.9 | 110.9 | 107.6 |
Income Taxes |  | 10.1 | 29.3 | 42.1 |
Noncash Investing and Financing Activities: |  |  |  |  |
Construction in Progress Expenditures Incurred but Not yet Paid |  | 71.9 | 87.8 | 62.8 |
Construction Expenditures Included in Current Liabilities as of December 31, |  | 71.9 | 87.8 | 62.8 |
Acquisition of Nuclear Fuel Included in Current Liabilities as of December 31, |  | 0.0 | 0.0 | 33.4 |
Organization and Summary of Significant Accounting Policies (Textuals) |  |  |  |  |
Issuance of Long-term Debt |  | 142.7 | 546.7 | 69.5 |
Repayments of Long-term Debt |  | 83.4 | 383.5 | 93.2 |
Net Income (Loss) |  | 324.7 | 279.8 | 284.8 |
Retained Earnings |  | 1,963.2 | 1,748.5 |  |
Indiana Michigan Power Co [Member] | Retained Earnings [Member] |  |  |  |  |
Other Income (Expense) |  |  |  |  |
Net Income (Loss) |  | 324.7 | 279.8 | 284.8 |
Operating Activites |  |  |  |  |
Net Income (Loss) |  | 324.7 | 279.8 | 284.8 |
Organization and Summary of Significant Accounting Policies (Textuals) |  |  |  |  |
Net Income (Loss) |  | $ 324.7 | 279.8 | 284.8 |
Indiana Michigan Power Co [Member] | Pension Plans [Member] | Equity [Member] |  |  |  |  |
Target Asset Allocations |  |  |  |  |
Target Asset Allocation |  | 30.00% |  |  |
Indiana Michigan Power Co [Member] | Pension Plans [Member] | Fixed Income [Member] |  |  |  |  |
Target Asset Allocations |  |  |  |  |
Target Asset Allocation |  | 54.00% |  |  |
Indiana Michigan Power Co [Member] | Pension Plans [Member] | Other Investments [Member] |  |  |  |  |
Target Asset Allocations |  |  |  |  |
Target Asset Allocation |  | 15.00% |  |  |
Indiana Michigan Power Co [Member] | Pension Plans [Member] | Cash and Cash Equivalents [Member] |  |  |  |  |
Target Asset Allocations |  |  |  |  |
Target Asset Allocation |  | 1.00% |  |  |
Indiana Michigan Power Co [Member] | Other Postretirement Benefit Plans [Member] | Equity [Member] |  |  |  |  |
Target Asset Allocations |  |  |  |  |
Target Asset Allocation |  | 59.00% |  |  |
Indiana Michigan Power Co [Member] | Other Postretirement Benefit Plans [Member] | Fixed Income [Member] |  |  |  |  |
Target Asset Allocations |  |  |  |  |
Target Asset Allocation |  | 40.00% |  |  |
Indiana Michigan Power Co [Member] | Other Postretirement Benefit Plans [Member] | Cash and Cash Equivalents [Member] |  |  |  |  |
Target Asset Allocations |  |  |  |  |
Target Asset Allocation |  | 1.00% |  |  |
Indiana Michigan Power Co [Member] | Pension and Other Postretirement Benefit Plans [Member] |  |  |  |  |
Supplementary Information |  |  |  |  |
Securities Loaned |  | $ 83.0 | 137.0 |  |
Ohio Power Co [Member] |  |  |  |  |
Materials and Supplies |  | 109.5 | 74.1 |  |
Supplementary Information |  |  |  |  |
Depreciation and Amortization of Property, Plant and Equipment |  | 293.1 | 301.1 | 275.0 |
Amortization of Certain Securitized Assets |  | 0.0 | 0.0 | 0.0 |
Amortization of Regulatory Assets and Liabilities |  | 1.2 | 2.2 | 1.6 |
Total Depreciation and Amortization |  | 294.3 | 303.3 | 276.6 |
Cash, Cash Equivalents and Restricted Cash |  |  |  |  |
Cash and Cash Equivalents at Beginning of Period |  | 3.0 |  |  |
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents |  | 9.6 | 3.0 | 7.4 | $ 3.7
Revenues |  |  |  |  |
TOTAL REVENUES |  | 3,665.1 | 2,899.1 | 2,749.1 |
Expenses |  |  |  |  |
Depreciation and Amortization |  | 294.3 | 303.3 | 276.6 |
TOTAL EXPENSES |  | 3,251.4 | 2,513.9 | 2,345.4 |
OPERATING INCOME (LOSS) |  | 413.7 | 385.2 | 403.7 |
Other Income (Expense) |  |  |  |  |
Allowance for Equity Funds Used During Construction |  | 13.9 | 10.8 | 12.5 |
Interest Expense |  | (119.6) | (124.4) | (117.2) |
INCOME BEFORE INCOME TAX EXPENSE (BENEFIT) AND EQUITY EARNINGS (LOSS) |  | 331.4 | 288.0 | 316.6 |
Income Tax Expense/Benefit |  | 44.2 | 34.4 | 45.2 |
Net Income (Loss) |  | 287.8 | 253.6 | 271.4 |
Accounts Receivable: |  |  |  |  |
Customers |  | 119.9 | 71.6 |  |
Total Accounts Receivable |  | 238.6 | 150.0 |  |
TOTAL CURRENT ASSETS |  | 414.4 | 327.5 |  |
Property, Plant and Equipment |  |  |  |  |
Transmission |  | 3,198.6 | 2,992.8 |  |
Other Property, Plant and Equipment |  | 1,051.4 | 992.9 |  |
Construction Work in Progress |  | 474.3 | 365.0 |  |
Total Property, Plant and Equipment |  | 11,174.6 | 10,421.3 |  |
Accumulated Depreciation and Amortization |  | 2,565.3 | 2,458.3 |  |
TOTAL PROPERTY, PLANT AND EQUIPMENT - NET |  | 8,609.3 | 7,963.0 |  |
Other Noncurrent Assets |  |  |  |  |
TOTAL OTHER NONCURRENT ASSETS |  | 979.4 | 975.3 |  |
TOTAL ASSETS |  | 10,003.1 | 9,265.8 |  |
Current Liabilities |  |  |  |  |
Accounts Payable |  | 337.3 | 213.5 |  |
Affiliated Companies |  | 126.1 | 125.4 |  |
Accrued Taxes |  | 733.1 | 702.4 |  |
TOTAL CURRENT LIABILITIES |  | 1,635.5 | 1,245.7 |  |
Liabilities, Noncurrent |  |  |  |  |
Regulatory Liabilities and Deferred Investment Tax Credits |  | 1,044.0 | 1,020.9 |  |
TOTAL NONCURRENT LIABILITIES |  | 5,279.5 | 5,173.8 |  |
TOTAL LIABILITIES |  | 6,915.0 | 6,419.5 |  |
Equity [Abstract] |  |  |  |  |
Retained Earnings |  | 1,929.1 | 1,686.3 |  |
TOTAL LIABILITIES AND EQUITY |  | 10,003.1 | 9,265.8 |  |
Operating Activites |  |  |  |  |
Net Income (Loss) |  | 287.8 | 253.6 | 271.4 |
Adjustments to Reconcile Net Income to Net Cash Flows from (Used for) Operating Activities: |  |  |  |  |
Depreciation and Amortization |  | 294.3 | 303.3 | 276.6 |
Deferred Income Taxes |  | 71.5 | 30.7 | 77.2 |
Allowance for Equity Funds Used During Construction |  | (13.9) | (10.8) | (12.5) |
Amortization of Deferred Property Taxes |  | (20.0) | (35.3) | (16.6) |
Change in Other Noncurrent Assets |  | (87.1) | (40.7) | (49.4) |
Increase (Decrease) in Other Noncurrent Liabilities |  | 91.1 | 6.9 | (66.4) |
Accounts Receivable, Net |  | (83.7) | (11.8) | 4.2 |
Accounts Payable |  | 112.7 | 19.1 | 10.3 |
Accrued Taxes, Net |  | 27.8 | 78.2 | 43.3 |
Net Cash Flows from Operating Activities |  | 686.1 | 575.6 | 410.9 |
Investing Activities |  |  |  |  |
Net Cash Flows Used for Investing Activities |  | (802.5) | (753.3) | (791.0) |
Net Cash Provided by (Used in) Financing Activities |  |  |  |  |
Net Cash Flows from Financing Activities |  | 123.0 | 173.3 | 383.8 |
Cash and Cash Equivalents at Beginning of Period |  | 3.0 |  |  |
Cash and Cash Equivalents at End of Period |  | 9.6 | 3.0 |  |
Cash Paid (Received) for: |  |  |  |  |
Cash Paid for Interest, Net of Capitalized Amounts |  | 113.4 | 119.5 | 111.2 |
Income Taxes |  | (19.7) | (7.9) | (26.9) |
Noncash Investing and Financing Activities: |  |  |  |  |
Construction in Progress Expenditures Incurred but Not yet Paid |  | 109.7 | 97.1 | 76.7 |
Construction Expenditures Included in Current Liabilities as of December 31, |  | 109.7 | 97.1 | 76.7 |
Organization and Summary of Significant Accounting Policies (Textuals) |  |  |  |  |
Issuance of Long-term Debt |  | 0.0 | 1,037.1 | 347.0 |
Repayments of Long-term Debt |  | 0.1 | 500.1 | 0.1 |
Income (Loss) from Equity Method Investment |  | 0.6 | 0.0 | 0.0 |
Net Income (Loss) |  | 287.8 | 253.6 | 271.4 |
Retained Earnings |  | 1,929.1 | 1,686.3 |  |
Ohio Power Co [Member] | Retained Earnings [Member] |  |  |  |  |
Other Income (Expense) |  |  |  |  |
Net Income (Loss) |  | 287.8 | 253.6 | 271.4 |
Operating Activites |  |  |  |  |
Net Income (Loss) |  | 287.8 | 253.6 | 271.4 |
Organization and Summary of Significant Accounting Policies (Textuals) |  |  |  |  |
Net Income (Loss) |  | $ 287.8 | 253.6 | 271.4 |
Ohio Power Co [Member] | Pension Plans [Member] | Equity [Member] |  |  |  |  |
Target Asset Allocations |  |  |  |  |
Target Asset Allocation |  | 30.00% |  |  |
Ohio Power Co [Member] | Pension Plans [Member] | Fixed Income [Member] |  |  |  |  |
Target Asset Allocations |  |  |  |  |
Target Asset Allocation |  | 54.00% |  |  |
Ohio Power Co [Member] | Pension Plans [Member] | Other Investments [Member] |  |  |  |  |
Target Asset Allocations |  |  |  |  |
Target Asset Allocation |  | 15.00% |  |  |
Ohio Power Co [Member] | Pension Plans [Member] | Cash and Cash Equivalents [Member] |  |  |  |  |
Target Asset Allocations |  |  |  |  |
Target Asset Allocation |  | 1.00% |  |  |
Ohio Power Co [Member] | Other Postretirement Benefit Plans [Member] | Equity [Member] |  |  |  |  |
Target Asset Allocations |  |  |  |  |
Target Asset Allocation |  | 59.00% |  |  |
Ohio Power Co [Member] | Other Postretirement Benefit Plans [Member] | Fixed Income [Member] |  |  |  |  |
Target Asset Allocations |  |  |  |  |
Target Asset Allocation |  | 40.00% |  |  |
Ohio Power Co [Member] | Other Postretirement Benefit Plans [Member] | Cash and Cash Equivalents [Member] |  |  |  |  |
Target Asset Allocations |  |  |  |  |
Target Asset Allocation |  | 1.00% |  |  |
Ohio Power Co [Member] | Pension and Other Postretirement Benefit Plans [Member] |  |  |  |  |
Supplementary Information |  |  |  |  |
Securities Loaned |  | $ 83.0 | 137.0 |  |
Public Service Co Of Oklahoma [Member] |  |  |  |  |
Materials and Supplies |  | 111.1 | 56.2 |  |
Supplementary Information |  |  |  |  |
Depreciation and Amortization of Property, Plant and Equipment |  | 226.2 | 185.9 | 171.9 |
Amortization of Certain Securitized Assets |  | 0.0 | 0.0 | 0.0 |
Amortization of Regulatory Assets and Liabilities |  | 3.9 | 10.7 | 1.6 |
Total Depreciation and Amortization |  | 230.1 | 196.6 | 173.5 |
Cash, Cash Equivalents and Restricted Cash |  |  |  |  |
Cash and Cash Equivalents at Beginning of Period |  | 1.3 | 2.6 | 1.5 |
Revenues |  |  |  |  |
TOTAL REVENUES |  | 1,874.7 | 1,474.4 | 1,266.1 |
Expenses |  |  |  |  |
Depreciation and Amortization |  | 230.1 | 196.6 | 173.5 |
TOTAL EXPENSES |  | 1,693.9 | 1,281.5 | 1,090.2 |
OPERATING INCOME (LOSS) |  | 180.8 | 192.9 | 175.9 |
Other Income (Expense) |  |  |  |  |
Allowance for Equity Funds Used During Construction |  | 1.5 | 2.4 | 4.0 |
Interest Expense |  | (83.8) | (62.9) | (60.3) |
INCOME BEFORE INCOME TAX EXPENSE (BENEFIT) AND EQUITY EARNINGS (LOSS) |  | 118.4 | 145.2 | 128.2 |
Income Tax Expense/Benefit |  | (49.2) | 4.1 | 5.2 |
Net Income (Loss) |  | 167.6 | 141.1 | 123.0 |
Accounts Receivable: |  |  |  |  |
Customers |  | 70.1 | 41.5 |  |
Total Accounts Receivable |  | 123.1 | 77.1 |  |
Accrued Tax Benefits |  | 16.1 | 17.6 |  |
TOTAL CURRENT ASSETS |  | 491.5 | 386.8 |  |
Property, Plant and Equipment |  |  |  |  |
Transmission |  | 1,164.4 | 1,107.7 |  |
Other Property, Plant and Equipment |  | 469.3 | 437.0 |  |
Construction Work in Progress |  | 219.3 | 156.0 |  |
Total Property, Plant and Equipment |  | 7,464.2 | 6,508.0 |  |
Accumulated Depreciation and Amortization |  | 1,837.7 | 1,705.2 |  |
TOTAL PROPERTY, PLANT AND EQUIPMENT - NET |  | 5,626.5 | 4,802.8 |  |
Other Noncurrent Assets |  |  |  |  |
TOTAL OTHER NONCURRENT ASSETS |  | 847.9 | 1,209.4 |  |
TOTAL ASSETS |  | 6,965.9 | 6,399.0 |  |
Current Liabilities |  |  |  |  |
Accounts Payable |  | 202.9 | 157.4 |  |
Affiliated Companies |  | 76.7 | 51.0 |  |
Accrued Taxes |  | 28.7 | 27.0 |  |
TOTAL CURRENT LIABILITIES |  | 842.7 | 562.7 |  |
Liabilities, Noncurrent |  |  |  |  |
Regulatory Liabilities and Deferred Investment Tax Credits |  | 809.1 | 835.3 |  |
TOTAL NONCURRENT LIABILITIES |  | 3,704.1 | 3,544.7 |  |
TOTAL LIABILITIES |  | 4,546.8 | 4,107.4 |  |
Equity [Abstract] |  |  |  |  |
Retained Earnings |  | 1,218.0 | 1,095.4 |  |
TOTAL LIABILITIES AND EQUITY |  | 6,965.9 | 6,399.0 |  |
Operating Activites |  |  |  |  |
Net Income (Loss) |  | 167.6 | 141.1 | 123.0 |
Adjustments to Reconcile Net Income to Net Cash Flows from (Used for) Operating Activities: |  |  |  |  |
Depreciation and Amortization |  | 230.1 | 196.6 | 173.5 |
Deferred Income Taxes |  | (59.4) | 113.9 | 17.0 |
Allowance for Equity Funds Used During Construction |  | (1.5) | (2.4) | (4.0) |
Change in Other Noncurrent Assets |  | (35.4) | (18.3) | (17.9) |
Increase (Decrease) in Other Noncurrent Liabilities |  | 29.9 | 4.4 | 1.6 |
Accounts Receivable, Net |  | (46.0) | (28.7) | 1.4 |
Accounts Payable |  | 57.5 | 34.2 | (29.5) |
Accrued Taxes, Net |  | 3.2 | (6.5) | 3.6 |
Net Cash Flows from Operating Activities |  | 747.7 | (433.3) | 157.0 |
Investing Activities |  |  |  |  |
Net Cash Flows Used for Investing Activities |  | (992.0) | (626.7) | (295.1) |
Net Cash Provided by (Used in) Financing Activities |  |  |  |  |
Net Cash Flows from Financing Activities |  | 247.0 | 1,058.7 | 139.2 |
Cash and Cash Equivalents at Beginning of Period |  | 1.3 | 2.6 | 1.5 |
Cash and Cash Equivalents at End of Period |  | 4.0 | 1.3 | 2.6 |
Cash Paid (Received) for: |  |  |  |  |
Cash Paid for Interest, Net of Capitalized Amounts |  | 79.7 | 57.0 | 59.1 |
Income Taxes |  | (12.5) | (102.9) | (11.8) |
Noncash Investing and Financing Activities: |  |  |  |  |
Construction in Progress Expenditures Incurred but Not yet Paid |  | 69.8 | 56.8 | 35.5 |
Construction Expenditures Included in Current Liabilities as of December 31, |  | 69.8 | 56.8 | 35.5 |
Organization and Summary of Significant Accounting Policies (Textuals) |  |  |  |  |
Issuance of Long-term Debt |  | 499.7 | 1,290.0 | 0.0 |
Repayments of Long-term Debt |  | 500.5 | 750.5 | 13.2 |
Net Income (Loss) |  | 167.6 | 141.1 | 123.0 |
Retained Earnings |  | 1,218.0 | 1,095.4 |  |
Public Service Co Of Oklahoma [Member] | Retained Earnings [Member] |  |  |  |  |
Other Income (Expense) |  |  |  |  |
Net Income (Loss) |  | 167.6 | 141.1 | 123.0 |
Operating Activites |  |  |  |  |
Net Income (Loss) |  | 167.6 | 141.1 | 123.0 |
Organization and Summary of Significant Accounting Policies (Textuals) |  |  |  |  |
Net Income (Loss) |  | $ 167.6 | 141.1 | 123.0 |
Public Service Co Of Oklahoma [Member] | Pension Plans [Member] | Equity [Member] |  |  |  |  |
Target Asset Allocations |  |  |  |  |
Target Asset Allocation |  | 30.00% |  |  |
Public Service Co Of Oklahoma [Member] | Pension Plans [Member] | Fixed Income [Member] |  |  |  |  |
Target Asset Allocations |  |  |  |  |
Target Asset Allocation |  | 54.00% |  |  |
Public Service Co Of Oklahoma [Member] | Pension Plans [Member] | Other Investments [Member] |  |  |  |  |
Target Asset Allocations |  |  |  |  |
Target Asset Allocation |  | 15.00% |  |  |
Public Service Co Of Oklahoma [Member] | Pension Plans [Member] | Cash and Cash Equivalents [Member] |  |  |  |  |
Target Asset Allocations |  |  |  |  |
Target Asset Allocation |  | 1.00% |  |  |
Public Service Co Of Oklahoma [Member] | Other Postretirement Benefit Plans [Member] | Equity [Member] |  |  |  |  |
Target Asset Allocations |  |  |  |  |
Target Asset Allocation |  | 59.00% |  |  |
Public Service Co Of Oklahoma [Member] | Other Postretirement Benefit Plans [Member] | Fixed Income [Member] |  |  |  |  |
Target Asset Allocations |  |  |  |  |
Target Asset Allocation |  | 40.00% |  |  |
Public Service Co Of Oklahoma [Member] | Other Postretirement Benefit Plans [Member] | Cash and Cash Equivalents [Member] |  |  |  |  |
Target Asset Allocations |  |  |  |  |
Target Asset Allocation |  | 1.00% |  |  |
Public Service Co Of Oklahoma [Member] | Pension and Other Postretirement Benefit Plans [Member] |  |  |  |  |
Supplementary Information |  |  |  |  |
Securities Loaned |  | $ 83.0 | 137.0 |  |
Southwestern Electric Power Co [Member] |  |  |  |  |
Materials and Supplies |  | 92.1 | 81.9 |  |
Supplementary Information |  |  |  |  |
Depreciation and Amortization of Property, Plant and Equipment |  | 319.3 | 292.9 | 271.2 |
Amortization of Certain Securitized Assets |  | 0.0 | 0.0 | 0.0 |
Amortization of Regulatory Assets and Liabilities |  | 5.5 | 2.1 | 1.5 |
Total Depreciation and Amortization |  | 324.8 | 295.0 | 272.7 |
Cash, Cash Equivalents and Restricted Cash |  |  |  |  |
Cash and Cash Equivalents at Beginning of Period |  | 51.2 | 13.2 | 1.6 |
Amounts Attributable to AEP Common Shareholders |  |  |  |  |
Net Income (Loss) Attributable to Noncontrolling Interests |  | 4.2 | 3.1 | 2.9 |
Net Income (Loss) |  | 290.1 | 239.0 | 180.8 |
Revenues |  |  |  |  |
TOTAL REVENUES |  | 2,284.4 | 2,131.8 | 1,738.5 |
Expenses |  |  |  |  |
Depreciation and Amortization |  | 324.8 | 295.0 | 272.7 |
TOTAL EXPENSES |  | 1,914.4 | 1,792.3 | 1,448.0 |
OPERATING INCOME (LOSS) |  | 370.0 | 339.5 | 290.5 |
Other Income (Expense) |  |  |  |  |
Allowance for Equity Funds Used During Construction |  | 4.9 | 7.0 | 7.7 |
Interest Expense |  | (137.4) | (125.9) | (118.5) |
INCOME BEFORE INCOME TAX EXPENSE (BENEFIT) AND EQUITY EARNINGS (LOSS) |  | 267.7 | 238.1 | 190.2 |
Income Tax Expense/Benefit |  | (25.2) | (0.6) | 9.4 |
Net Income (Loss) |  | 294.3 | 242.1 | 183.7 |
Accounts Receivable: |  |  |  |  |
Customers |  | 38.8 | 35.8 |  |
Total Accounts Receivable |  | 114.6 | 86.4 |  |
Accrued Tax Benefits |  | 16.5 | 17.8 |  |
TOTAL CURRENT ASSETS |  | 812.2 | 668.5 |  |
Property, Plant and Equipment |  |  |  |  |
Transmission |  | 2,479.8 | 2,316.9 |  |
Other Property, Plant and Equipment |  | 804.4 | 764.0 |  |
Construction Work in Progress |  | 369.5 | 240.7 |  |
Total Property, Plant and Equipment |  | 11,789.5 | 10,570.4 |  |
Accumulated Depreciation and Amortization |  | 3,527.3 | 3,170.3 |  |
TOTAL PROPERTY, PLANT AND EQUIPMENT - NET |  | 8,262.2 | 7,400.1 |  |
Other Noncurrent Assets |  |  |  |  |
TOTAL OTHER NONCURRENT ASSETS |  | 1,304.4 | 1,257.1 |  |
TOTAL ASSETS |  | 10,378.8 | 9,325.7 |  |
Current Liabilities |  |  |  |  |
Accounts Payable |  | 213.1 | 163.6 |  |
Affiliated Companies |  | 81.7 | 61.4 |  |
Accrued Taxes |  | 52.8 | 44.3 |  |
TOTAL CURRENT LIABILITIES |  | 947.7 | 538.7 |  |
Liabilities, Noncurrent |  |  |  |  |
Regulatory Liabilities and Deferred Investment Tax Credits |  | 825.7 | 806.9 |  |
TOTAL NONCURRENT LIABILITIES |  | 5,756.3 | 5,637.2 |  |
TOTAL LIABILITIES |  | 6,704.0 | 6,175.9 |  |
Equity [Abstract] |  |  |  |  |
Retained Earnings |  | 2,236.0 | 2,050.9 |  |
TOTAL LIABILITIES AND EQUITY |  | 10,378.8 | 9,325.7 |  |
Operating Activites |  |  |  |  |
Net Income (Loss) |  | 294.3 | 242.1 | 183.7 |
Adjustments to Reconcile Net Income to Net Cash Flows from (Used for) Operating Activities: |  |  |  |  |
Depreciation and Amortization |  | 324.8 | 295.0 | 272.7 |
Deferred Income Taxes |  | 9.4 | 16.6 | 32.4 |
Allowance for Equity Funds Used During Construction |  | (4.9) | (7.0) | (7.7) |
Change in Other Noncurrent Assets |  | 42.9 | 41.9 | 16.1 |
Increase (Decrease) in Other Noncurrent Liabilities |  | 18.3 | (1.1) | 25.2 |
Accounts Receivable, Net |  | (28.2) | (21.5) | 7.3 |
Accounts Payable |  | 34.1 | 22.0 | 11.1 |
Accrued Taxes, Net |  | 9.8 | 15.4 | (23.1) |
Net Cash Flows from Operating Activities |  | 586.6 | 96.8 | 356.3 |
Investing Activities |  |  |  |  |
Net Cash Flows Used for Investing Activities |  | (1,085.1) | (920.7) | (392.6) |
Net Cash Provided by (Used in) Financing Activities |  |  |  |  |
Net Cash Flows from Financing Activities |  | 535.7 | 861.9 | 47.9 |
Cash and Cash Equivalents at Beginning of Period |  | 51.2 | 13.2 | 1.6 |
Cash and Cash Equivalents at End of Period |  | 88.4 | 51.2 | 13.2 |
Cash Paid (Received) for: |  |  |  |  |
Cash Paid for Interest, Net of Capitalized Amounts |  | 131.2 | 116.5 | 110.7 |
Income Taxes |  | (29.1) | (28.8) | 4.3 |
Noncash Investing and Financing Activities: |  |  |  |  |
Construction in Progress Expenditures Incurred but Not yet Paid |  | 105.6 | 69.0 | 46.0 |
Construction Expenditures Included in Current Liabilities as of December 31, |  | 105.6 | 69.0 | 46.0 |
Organization and Summary of Significant Accounting Policies (Textuals) |  |  |  |  |
Issuance of Long-term Debt |  | 0.0 | 1,137.6 | 0.0 |
Repayments of Long-term Debt |  | 6.2 | 381.2 | 21.2 |
Income (Loss) from Equity Method Investment |  | 1.4 | 3.4 | 2.9 |
Net Income (Loss) |  | 294.3 | 242.1 | 183.7 |
Retained Earnings |  | 2,236.0 | 2,050.9 |  |
Southwestern Electric Power Co [Member] | Retained Earnings [Member] |  |  |  |  |
Amounts Attributable to AEP Common Shareholders |  |  |  |  |
Net Income (Loss) |  | $ 290.1 | 239.0 | $ 180.8 |
Southwestern Electric Power Co [Member] | Pension Plans [Member] | Equity [Member] |  |  |  |  |
Target Asset Allocations |  |  |  |  |
Target Asset Allocation |  | 30.00% |  |  |
Southwestern Electric Power Co [Member] | Pension Plans [Member] | Fixed Income [Member] |  |  |  |  |
Target Asset Allocations |  |  |  |  |
Target Asset Allocation |  | 54.00% |  |  |
Southwestern Electric Power Co [Member] | Pension Plans [Member] | Other Investments [Member] |  |  |  |  |
Target Asset Allocations |  |  |  |  |
Target Asset Allocation |  | 15.00% |  |  |
Southwestern Electric Power Co [Member] | Pension Plans [Member] | Cash and Cash Equivalents [Member] |  |  |  |  |
Target Asset Allocations |  |  |  |  |
Target Asset Allocation |  | 1.00% |  |  |
Southwestern Electric Power Co [Member] | Other Postretirement Benefit Plans [Member] | Equity [Member] |  |  |  |  |
Target Asset Allocations |  |  |  |  |
Target Asset Allocation |  | 59.00% |  |  |
Southwestern Electric Power Co [Member] | Other Postretirement Benefit Plans [Member] | Fixed Income [Member] |  |  |  |  |
Target Asset Allocations |  |  |  |  |
Target Asset Allocation |  | 40.00% |  |  |
Southwestern Electric Power Co [Member] | Other Postretirement Benefit Plans [Member] | Cash and Cash Equivalents [Member] |  |  |  |  |
Target Asset Allocations |  |  |  |  |
Target Asset Allocation |  | 1.00% |  |  |
Southwestern Electric Power Co [Member] | Pension and Other Postretirement Benefit Plans [Member] |  |  |  |  |
Supplementary Information |  |  |  |  |
Securities Loaned |  | $ 83.0 | $ 137.0 |  |
Restricted Stock Units and Performance Share Units [Member] |  |  |  |  |
Weighted Average Dilutive Effect of: |  |  |  |  |
Weighted Average Dilutive Effect of Shares |  | 1,700,000 | 1,300,000 | 1,500,000 |
Dilutive Securities, Effect on Basic Earnings Per Share |  | $ (0.02) | $ (0.01) | $ (0.02) |
Revenues [Member] | AEP Texas Inc. [Member] | Credit Concentration Risk |  |  |  |  |
Risks and Uncertainties |  |  |  |  |
Percentage of Significant Customers Concentration Risk | [1] | 45.00% | 43.00% | 46.00% |
Revenues [Member] | AEP Transmission Co [Member] | Credit Concentration Risk |  |  |  |  |
Risks and Uncertainties |  |  |  |  |
Percentage of Significant Customers Concentration Risk |  | 79.00% | 79.00% | 78.00% |
Revenues [Member] | Appalachian Power Co [Member] | Credit Concentration Risk |  |  |  |  |
Risks and Uncertainties |  |  |  |  |
Percentage of Significant Customers Concentration Risk |  | 10.00% | 10.00% | 10.00% |
Revenues [Member] | Indiana Michigan Power Co [Member] | Credit Concentration Risk |  |  |  |  |
Risks and Uncertainties |  |  |  |  |
Percentage of Significant Customers Concentration Risk |  | 10.00% | 10.00% | 10.00% |
Revenues [Member] | Ohio Power Co [Member] | Credit Concentration Risk |  |  |  |  |
Risks and Uncertainties |  |  |  |  |
Percentage of Significant Customers Concentration Risk |  | 10.00% | 10.00% | 10.00% |
Revenues [Member] | Public Service Co Of Oklahoma [Member] | Credit Concentration Risk |  |  |  |  |
Risks and Uncertainties |  |  |  |  |
Percentage of Significant Customers Concentration Risk |  | 10.00% | 10.00% | 10.00% |
Revenues [Member] | Southwestern Electric Power Co [Member] | Credit Concentration Risk |  |  |  |  |
Risks and Uncertainties |  |  |  |  |
Percentage of Significant Customers Concentration Risk |  | 10.00% | 10.00% | 10.00% |
Accounts Receivable [Member] | AEP Texas Inc. [Member] | Credit Concentration Risk |  |  |  |  |
Risks and Uncertainties |  |  |  |  |
Percentage of Significant Customers Concentration Risk | [1] | 42.00% | 41.00% | 40.00% |
Accounts Receivable [Member] | AEP Transmission Co [Member] | Credit Concentration Risk |  |  |  |  |
Risks and Uncertainties |  |  |  |  |
Percentage of Significant Customers Concentration Risk |  | 72.00% | 81.00% | 78.00% |
Noncontrolling Interest [Member] | Dry Lake Solar Project [Member] |  |  |  |  |
Noncash Investing and Financing Activities: |  |  |  |  |
Noncash Contribution of Assets by Noncontrolling Interest |  | $ 0.0 | $ 35.3 | $ 0.0 |
Sabine Mining Co [Member] | Southwestern Electric Power Co [Member] |  |  |  |  |
Materials and Supplies |  | 4.2 | 12.0 |  |
Cash, Cash Equivalents and Restricted Cash |  |  |  |  |
Cash and Cash Equivalents at Beginning of Period |  | 49.9 |  |  |
Property, Plant and Equipment |  |  |  |  |
Other Property, Plant and Equipment |  | 219.8 | 219.9 |  |
Accumulated Depreciation and Amortization |  | 212.5 | 168.1 |  |
Net Cash Provided by (Used in) Financing Activities |  |  |  |  |
Cash and Cash Equivalents at Beginning of Period |  | 49.9 |  |  |
Cash and Cash Equivalents at End of Period |  | $ 84.2 | $ 49.9 |  |
[1] | In January 2021, NRG Energy, parent company of Reliant Energy, completed a deal to purchase Direct Energy from Centrica.

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