Consolidated Statements of Income - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Revenues
Vertically Integrated Utilities	$ 2,218.1	$ 2,487.4
Transmission and Distribution Utilities	1,077.3	1,206.3
Generation & Marketing	713.9	859.2
Other Revenues	35.6	27.5
TOTAL REVENUES	4,044.9	4,580.4
Expenses
Fuel and Other Consumables Used for Electric Generation	675.6	1,071.2
Purchased Electricity for Resale	731.4	718.4
Other Operation	715.1	661.3
Maintenance	278.7	285.6
Depreciation and Amortization	497.1	495.4
Taxes Other Than Income Taxes	254.1	245.7
TOTAL EXPENSES	3,152.0	3,477.6
Operating Income (Loss)	892.9	1,102.8
Other Income (Expense):
Interest and Investment Income	2.1	1.4
Carrying Costs Income	3.9	8.4
Allowance for Equity Funds Used During Construction	31.7	29.7
Interest Expense	(217.0)	(218.7)
INCOME BEFORE INCOME TAX EXPENSE	713.6	923.6
Income Tax Expense (Credit)	235.5	327.2
Equity Earnings (Loss) of Unconsolidated Subsidiaries	25.0	23.8
Income from Continuing Operations	503.1	620.2
Income from Discontinued Operations, Net of Tax	0.0	10.5
Net Income (Loss)	503.1	630.7
Net Income Attributable to Noncontrolling Interests	1.9	1.5
Earnings Attributable to Common Shareholders	$ 501.2	$ 629.2
Earnings Per Share
Weighted Average Number of Basic AEP Common Shares Outstanding	491,108,392	489,597,986
Basic Earnings Per Share Attributable to AEP Common Shareholders from Continuing Operations	$ 1.02	$ 1.27
Basic Earnings Per Share Attributable to AEP Common Shareholders from Discontinued Operations	0.00	0.02
Total Basic Earnings Per Share Attributable to AEP Common Shareholders	$ 1.02	$ 1.29
Weighted Average Number of Diluted AEP Common Shares Outstanding	491,332,305	489,936,726
Diluted Earnings Per Share Attributable to AEP Common Shareholders from Continuing Operations	$ 1.02	$ 1.27
Diluted Earnings Per Share Attributable to AEP Common Shareholders From Discontinued Operations	0.00	0.02
Total Diluted Earnings Per Share Attributable to AEP Common Shareholders	1.02	1.29
Common Stock, Dividends, Per Share, Declared	$ 0.56	$ 0.53
Appalachian Power Co [Member]
Revenues
Vertically Integrated Utilities	$ 775.5	$ 854.2
Sales to AEP Affiliates	40.4	42.5
Other Revenues	4.1	2.3
TOTAL REVENUES	820.0	899.0
Expenses
Fuel and Other Consumables Used for Electric Generation	150.7	223.3
Purchased Electricity for Resale	108.2	112.7
Other Operation	120.6	106.1
Maintenance	69.3	52.3
Depreciation and Amortization	95.5	100.1
Taxes Other Than Income Taxes	31.3	31.0
TOTAL EXPENSES	575.6	625.5
Operating Income (Loss)	244.4	273.5
Other Income (Expense):
Allowance for Equity Funds Used During Construction	2.3	3.0
Other Income	1.8	3.7
Interest Expense	(47.0)	(50.3)
INCOME BEFORE INCOME TAX EXPENSE	199.2	226.9
Income Tax Expense (Credit)	72.9	85.1
Net Income (Loss)	126.3	141.8
Indiana Michigan Power Co [Member]
Revenues
Vertically Integrated Utilities	500.4	566.2
Sales to AEP Affiliates	11.5	0.5
Other Revenues - Affiliated	15.3	18.6
Other Revenues	5.5	1.0
TOTAL REVENUES	532.7	586.3
Expenses
Fuel and Other Consumables Used for Electric Generation	69.2	99.9
Purchased Electricity for Resale	49.6	55.9
Purchased Electricity from AEP Affiliates	45.4	55.0
Other Operation	141.3	129.0
Maintenance	40.9	47.3
Depreciation and Amortization	47.1	51.4
Taxes Other Than Income Taxes	23.4	23.4
TOTAL EXPENSES	416.9	461.9
Operating Income (Loss)	115.8	124.4
Other Income (Expense):
Interest Income	3.2	1.8
Allowance for Equity Funds Used During Construction	2.3	4.0
Interest Expense	(22.5)	(22.8)
INCOME BEFORE INCOME TAX EXPENSE	98.8	107.4
Income Tax Expense (Credit)	24.1	34.7
Net Income (Loss)	74.7	72.7
Ohio Power Co [Member]
Revenues
Transmission and Distribution Utilities	756.7	874.2
Sales to AEP Affiliates	4.8	42.1
Other Revenues	2.1	2.1
TOTAL REVENUES	763.6	918.4
Expenses
Purchased Electricity for Resale	164.9	142.1
Purchased Electricity from AEP Affiliates	49.1	270.6
Amortization Of Generation Deferrals	55.1	31.4
Other Operation	167.9	146.8
Maintenance	33.7	47.6
Depreciation and Amortization	61.3	59.2
Taxes Other Than Income Taxes	97.6	97.8
TOTAL EXPENSES	629.6	795.5
Operating Income (Loss)	134.0	122.9
Other Income (Expense):
Interest Income	1.5	1.9
Carrying Costs Income	1.9	6.5
Allowance for Equity Funds Used During Construction	1.7	2.4
Interest Expense	(31.4)	(32.4)
INCOME BEFORE INCOME TAX EXPENSE	107.7	101.3
Income Tax Expense (Credit)	37.5	35.9
Net Income (Loss)	70.2	65.4
Public Service Co Of Oklahoma [Member]
Revenues
Vertically Integrated Utilities	271.8	304.7
Sales to AEP Affiliates	1.0	1.3
Other Revenues	1.5	0.8
TOTAL REVENUES	274.3	306.8
Expenses
Fuel and Other Consumables Used for Electric Generation	15.5	85.6
Purchased Electricity for Resale	93.3	65.5
Other Operation	62.9	60.8
Maintenance	21.8	21.2
Depreciation and Amortization	35.3	29.5
Taxes Other Than Income Taxes	9.7	9.3
TOTAL EXPENSES	238.5	271.9
Operating Income (Loss)	35.8	34.9
Other Income (Expense):
Interest Income	0.2	0.1
Allowance for Equity Funds Used During Construction	2.3	1.3
Interest Expense	(14.4)	(14.6)
INCOME BEFORE INCOME TAX EXPENSE	23.9	21.7
Income Tax Expense (Credit)	8.2	8.0
Net Income (Loss)	15.7	13.7
Southwestern Electric Power Co [Member]
Revenues
Vertically Integrated Utilities	375.4	428.5
Sales to AEP Affiliates	3.1	2.7
Other Revenues	0.5	0.5
TOTAL REVENUES	379.0	431.7
Expenses
Fuel and Other Consumables Used for Electric Generation	121.9	157.7
Purchased Electricity for Resale	28.1	20.0
Other Operation	77.1	65.6
Maintenance	31.1	27.4
Depreciation and Amortization	47.5	47.0
Taxes Other Than Income Taxes	21.9	21.7
TOTAL EXPENSES	327.6	339.4
Operating Income (Loss)	51.4	92.3
Other Income (Expense):
Allowance for Equity Funds Used During Construction	7.4	5.2
Other Income	7.4	5.2
Interest Expense	(27.9)	(30.2)
INCOME BEFORE INCOME TAX EXPENSE	30.9	67.3
Income Tax Expense (Credit)	7.4	21.2
Equity Earnings (Loss) of Unconsolidated Subsidiaries	1.0	0.6
Net Income (Loss)	24.5	46.7
Net Income Attributable to Noncontrolling Interests	1.1	1.0
Earnings Attributable to Common Shareholders	$ 23.4	$ 45.7