Consolidated Statements of Income - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Revenues
Vertically Integrated Utilities	$ 2,538.3	$ 2,435.8	$ 6,864.6	$ 7,081.8
Transmission and Distribution Utilities	1,245.4	1,163.6	3,398.9	3,377.9
Generation & Marketing	823.3	801.8	2,192.5	2,288.6
Other Revenues	45.2	30.2	134.0	90.2
TOTAL REVENUES	4,652.2	4,431.4	12,590.0	12,838.5
Expenses
Fuel and Other Consumables Used for Electric Generation	880.1	955.9	2,236.1	2,782.4
Purchased Electricity for Resale	774.0	730.8	2,134.6	2,050.0
Other Operation	771.1	689.9	2,150.7	1,954.6
Maintenance	286.3	311.5	854.4	923.1
Asset Impairments and Other Related Charges	2,264.9	0.0	2,264.9	0.0
Depreciation and Amortization	539.3	534.9	1,550.2	1,528.0
Taxes Other Than Income Taxes	264.4	248.2	767.9	733.3
TOTAL EXPENSES	5,780.1	3,471.2	11,958.8	9,971.4
OPERATING INCOME (LOSS)	(1,127.9)	960.2	631.2	2,867.1
Other Income (Expense):
Interest and Investment Income	2.0	1.6	6.5	6.1
Carrying Costs Income	1.7	1.8	11.9	18.4
Allowance for Equity Funds Used During Construction	25.6	32.6	86.1	96.4
Interest Expense	(225.3)	(220.2)	(667.2)	(658.1)
INCOME FROM CONTINUING OPERATIONS BEFORE INCOME TAX EXPENSE (CREDIT) AND EQUITY EARNINGS (LOSS)	(1,323.9)	776.0	68.5	2,329.9
Income Tax Expense (Credit)	(534.5)	275.6	(134.0)	827.1
Equity Earnings (Loss) of Unconsolidated Subsidiaries	25.2	11.4	42.8	60.6
Income (Loss) from Continuing Operations	(764.2)	511.8	245.3	1,563.4
Income (Loss) from Discontinued Operations, Net of Tax	0.0	7.8	(2.5)	18.2
Net Income (Loss)	(764.2)	519.6	242.8	1,581.6
Net Income Attributable to Noncontrolling Interests	1.6	1.3	5.3	4.1
Earnings Attributable to Common Shareholders	$ (765.8)	$ 518.3	$ 237.5	$ 1,577.5
Earnings Per Share
Weighted Average Number of Basic AEP Common Shares Outstanding	491,697,809	490,648,929	491,422,921	490,155,315
Basic Earnings Per Share Attributable to AEP Common Shareholders from Continuing Operations	$ (1.56)	$ 1.04	$ 0.49	$ 3.18
Basic Earnings Per Share Attributable to AEP Common Shareholders from Discontinued Operations	0.00	0.02	(0.01)	0.04
Total Basic Earnings Per Share Attributable to AEP Common Shareholders	$ (1.56)	$ 1.06	$ 0.48	$ 3.22
Weighted Average Number of Diluted AEP Common Shares Outstanding	491,813,858	490,800,335	491,596,861	490,411,020
Diluted Earnings Per Share Attributable to AEP Common Shareholders from Continuing Operations	$ (1.56)	$ 1.04	$ 0.49	$ 3.18
Diluted Earnings Per Share Attributable to AEP Common Shareholders from Discontinued Operations	0.00	0.02	(0.01)	0.04
Total Diluted Earnings Per Share Attributable to AEP Common Shareholders	(1.56)	1.06	0.48	3.22
Common Stock, Dividends Per Share, Declared	$ 0.56	$ 0.53	$ 1.68	$ 1.59
Appalachian Power Co [Member]
Revenues
Vertically Integrated Utilities	$ 739.0	$ 685.3	$ 2,153.3	$ 2,184.9
Sales to AEP Affiliates	36.4	39.3	109.0	115.7
Other Revenues	2.8	2.9	9.4	7.9
TOTAL REVENUES	778.2	727.5	2,271.7	2,308.5
Expenses
Fuel and Other Consumables Used for Electric Generation	190.1	188.5	494.1	595.3
Purchased Electricity for Resale	69.2	80.5	240.9	258.9
Other Operation	117.6	101.8	349.4	311.6
Maintenance	66.8	70.5	196.3	179.8
Depreciation and Amortization	98.1	96.3	290.0	292.7
Taxes Other Than Income Taxes	32.0	32.0	93.9	93.1
TOTAL EXPENSES	573.8	569.6	1,664.6	1,731.4
OPERATING INCOME (LOSS)	204.4	157.9	607.1	577.1
Other Income (Expense):
Interest Income	0.3	0.3	0.8	1.2
Carrying Costs Income	0.0	0.1	0.2	0.8
Allowance for Equity Funds Used During Construction	4.5	3.4	9.1	10.3
Interest Expense	(46.4)	(46.6)	(140.7)	(145.6)
INCOME FROM CONTINUING OPERATIONS BEFORE INCOME TAX EXPENSE (CREDIT) AND EQUITY EARNINGS (LOSS)	162.8	115.1	476.5	443.8
Income Tax Expense (Credit)	58.7	40.5	172.7	168.4
Net Income (Loss)	104.1	74.6	303.8	275.4
Indiana Michigan Power Co [Member]
Revenues
Vertically Integrated Utilities	574.7	536.2	1,570.8	1,617.5
Sales to AEP Affiliates	3.9	9.6	22.4	16.6
Other Revenues - Affiliated	15.6	21.7	46.3	62.2
Other Revenues	3.4	0.8	13.2	2.6
TOTAL REVENUES	597.6	568.3	1,652.7	1,698.9
Expenses
Fuel and Other Consumables Used for Electric Generation	91.3	90.5	236.8	264.4
Purchased Electricity for Resale	43.7	41.5	134.3	147.7
Purchased Electricity from AEP Affiliates	64.5	67.2	165.9	182.2
Other Operation	138.9	141.0	413.9	407.3
Maintenance	45.7	53.8	134.6	160.9
Asset Impairments and Other Related Charges	10.5	0.0	10.5	0.0
Depreciation and Amortization	49.1	49.3	143.2	150.2
Taxes Other Than Income Taxes	22.5	21.6	71.5	67.0
TOTAL EXPENSES	466.2	464.9	1,310.7	1,379.7
OPERATING INCOME (LOSS)	131.4	103.4	342.0	319.2
Other Income (Expense):
Interest Income	1.7	1.9	9.1	7.2
Allowance for Equity Funds Used During Construction	4.1	2.1	10.9	9.1
Interest Expense	(26.7)	(23.1)	(76.3)	(68.9)
INCOME FROM CONTINUING OPERATIONS BEFORE INCOME TAX EXPENSE (CREDIT) AND EQUITY EARNINGS (LOSS)	110.5	84.3	285.7	266.6
Income Tax Expense (Credit)	35.1	27.7	84.3	86.7
Net Income (Loss)	75.4	56.6	201.4	179.9
Ohio Power Co [Member]
Revenues
Transmission and Distribution Utilities	864.4	775.9	2,349.2	2,320.4
Sales to AEP Affiliates	5.5	4.4	11.7	79.7
Other Revenues	1.4	2.0	4.8	6.4
TOTAL REVENUES	871.3	782.3	2,365.7	2,406.5
Expenses
Purchased Electricity for Resale	203.4	173.1	516.1	431.6
Purchased Electricity from AEP Affiliates	35.9	45.8	121.4	462.6
Amortization of Generation Deferrals	66.1	55.4	173.0	122.2
Other Operation	184.2	170.2	525.9	446.8
Maintenance	38.8	39.4	104.4	121.2
Depreciation and Amortization	69.4	63.7	189.0	178.6
Taxes Other Than Income Taxes	101.9	93.8	291.7	283.2
TOTAL EXPENSES	699.7	641.4	1,921.5	2,046.2
OPERATING INCOME (LOSS)	171.6	140.9	444.2	360.3
Other Income (Expense):
Interest Income	0.7	1.2	3.0	4.3
Carrying Costs Income	0.9	(1.6)	4.0	10.0
Allowance for Equity Funds Used During Construction	0.3	2.2	3.7	7.0
Interest Expense	(27.2)	(32.6)	(87.7)	(96.3)
INCOME FROM CONTINUING OPERATIONS BEFORE INCOME TAX EXPENSE (CREDIT) AND EQUITY EARNINGS (LOSS)	146.3	110.1	367.2	285.3
Income Tax Expense (Credit)	46.4	38.5	122.5	100.6
Net Income (Loss)	99.9	71.6	244.7	184.7
Public Service Co Of Oklahoma [Member]
Revenues
Vertically Integrated Utilities	400.9	418.6	971.3	1,040.9
Sales to AEP Affiliates	0.1	1.1	2.0	3.5
Other Revenues	0.7	0.6	2.9	2.2
TOTAL REVENUES	401.7	420.3	976.2	1,046.6
Expenses
Fuel and Other Consumables Used for Electric Generation	16.4	87.7	43.0	226.3
Purchased Electricity for Resale	130.8	103.2	315.3	253.8
Purchased Electricity from AEP Affiliates	3.2	0.0	3.6	0.0
Other Operation	81.0	77.5	211.8	199.3
Maintenance	25.6	27.2	71.6	74.3
Depreciation and Amortization	37.2	30.9	109.9	90.2
Taxes Other Than Income Taxes	9.1	9.3	27.8	27.8
TOTAL EXPENSES	303.3	335.8	783.0	871.7
OPERATING INCOME (LOSS)	98.4	84.5	193.2	174.9
Other Income (Expense):
Interest Income	0.2	0.2	0.5	0.3
Allowance for Equity Funds Used During Construction	1.1	2.4	4.9	6.0
Interest Expense	(14.9)	(15.0)	(44.6)	(44.4)
INCOME FROM CONTINUING OPERATIONS BEFORE INCOME TAX EXPENSE (CREDIT) AND EQUITY EARNINGS (LOSS)	84.8	72.1	154.0	136.8
Income Tax Expense (Credit)	32.0	27.4	56.6	51.3
Net Income (Loss)	52.8	44.7	97.4	85.5
Southwestern Electric Power Co [Member]
Revenues
Vertically Integrated Utilities	530.5	526.0	1,324.1	1,387.7
Sales to AEP Affiliates	8.6	5.9	20.0	13.1
Other Revenues	0.6	0.6	1.6	1.5
TOTAL REVENUES	539.7	532.5	1,345.7	1,402.3
Expenses
Fuel and Other Consumables Used for Electric Generation	158.8	180.0	403.3	463.1
Purchased Electricity for Resale	35.9	23.6	97.5	70.8
Other Operation	89.2	81.4	243.3	214.8
Maintenance	33.8	34.4	102.0	100.1
Depreciation and Amortization	51.2	48.9	148.1	143.8
Taxes Other Than Income Taxes	23.4	23.0	66.8	66.1
TOTAL EXPENSES	392.3	391.3	1,061.0	1,058.7
OPERATING INCOME (LOSS)	147.4	141.2	284.7	343.6
Other Income (Expense):
Interest Income	0.0	0.0	0.0	1.2
Allowance for Equity Funds Used During Construction	0.1	7.1	9.5	18.2
Interest Expense	(32.6)	(29.2)	(92.0)	(91.4)
INCOME FROM CONTINUING OPERATIONS BEFORE INCOME TAX EXPENSE (CREDIT) AND EQUITY EARNINGS (LOSS)	114.9	119.1	202.2	271.6
Income Tax Expense (Credit)	33.2	37.4	53.9	85.4
Equity Earnings (Loss) of Unconsolidated Subsidiaries	2.7	0.4	4.9	2.1
Net Income (Loss)	84.4	82.1	153.2	188.3
Net Income Attributable to Noncontrolling Interests	1.1	1.0	3.3	3.0
Earnings Attributable to Common Shareholders	$ 83.3	$ 81.1	$ 149.9	$ 185.3