Condensed Consolidated Balance Sheets - USD ($) $ in Millions		Mar. 31, 2016	Dec. 31, 2015
Current Assets
Cash and Cash Equivalents		$ 190.4	$ 176.4
Other Temporary Investments		264.5	386.8
Accounts Receivable:
Customers		651.2	615.9
Accrued Unbilled Revenues		91.1	31.2
Pledged Accounts Receivable - AEP Credit		870.7	940.3
Miscellaneous		72.3	82.1
Allowance for Uncollectible Accounts		(35.3)	(29.0)
Total Accounts Receivable		1,650.0	1,640.5
Fuel		701.6	600.8
Materials and Supplies		650.3	738.6
Risk Management Assets		143.8	134.4
Accrued Tax Benefits		226.1	58.9
Regulatory Asset for Under-Recovered Fuel Costs		102.3	115.2
Margin Deposits		81.3	107.3
Prepayments and Other Current Assets		136.0	113.5
TOTAL CURRENT ASSETS		4,146.3	4,072.4
Property, Plant and Equipment
Generation		26,145.0	25,559.8
Transmission		14,435.3	14,247.9
Distribution		18,231.3	18,046.9
Other Property, Plant and Equipment		3,812.3	3,722.9
Construction Work in Progress		3,806.3	3,903.9
Total Property, Plant and Equipment		66,430.2	65,481.4
Accumulated Depreciation and Amortization		19,597.3	19,348.2
TOTAL PROPERTY, PLANT AND EQUIPMENT - NET		46,832.9	46,133.2
Other Noncurrent Assets
Regulatory Assets		5,109.5	5,140.3
Securitized Assets		1,689.2	1,749.9
Spent Nuclear Fuel and Decommissioning Trusts		2,152.4	2,106.4
Goodwill		52.5	52.5
Long-term Risk Management Assets		328.9	321.8
Deferred Charges and Other Noncurrent Assets		2,174.8	2,106.6
TOTAL OTHER NONCURRENT ASSETS		11,507.3	11,477.5
TOTAL ASSETS		62,486.5	61,683.1
Current Liabilities
Accounts Payable		1,219.5	1,418.0
Short-term Debt:
Securitized Debt for Receivables - AEP Credit	[1]	719.0	675.0
Other Short-term Debt		502.0	125.0
Total Short-term Debt		1,221.0	800.0
Long-term Debt Due Within One Year		2,033.3	1,831.8
Long-term Debt Due Within One Year - Affiliated		0.0	0.0
Risk Management Liabilities		104.3	87.1
Customer Deposits		358.1	346.6
Accrued Taxes		899.5	979.1
Accrued Interest		237.6	226.9
Regulatory Liability for Over-Recovered Fuel Costs		93.0	113.9
Other Current Liabilities		1,055.6	1,305.1
TOTAL CURRENT LIABILITIES		7,221.9	7,108.5
Noncurrent Liabilities
Long-term Debt		17,749.3	17,740.9
Long-term Debt - Affiliated		0.0	0.0
Long-term Risk Management Liabilities		207.6	179.1
Deferred Income Taxes		12,133.8	11,733.2
Regulatory Liabilities and Deferred Investment Tax Credits		3,765.2	3,736.1
Asset Retirement Obligations		1,824.4	1,806.5
Employee Benefits and Pension Obligations		569.9	583.3
Deferred Credits and Other Noncurrent Liabilities		872.7	890.6
TOTAL NONCURRENT LIABILITIES		37,122.9	36,669.7
TOTAL LIABILITIES		$ 44,344.8	$ 43,778.2
Rate Matters
Commitments and Contingencies
Equity
Common Stock		$ 3,325.3	$ 3,324.0
Paid-in Capital		6,310.2	6,296.5
Retained Earnings		8,624.8	8,398.3
Accumulated Other Comprehensive Income (Loss)		(133.8)	(127.1)
TOTAL COMMON SHAREHOLDER'S EQUITY		18,126.5	17,891.7
Noncontrolling Interests		15.2	13.2
TOTAL EQUITY		18,141.7	17,904.9
TOTAL LIABILITIES AND EQUITY		62,486.5	61,683.1
Appalachian Power Co [Member]
Current Assets
Cash and Cash Equivalents		6.4	2.8
Restricted Cash for Securitized Funding		7.5	14.8
Advances to Affiliates		24.8	25.6
Accounts Receivable:
Customers		130.4	120.9
Affiliated Companies		49.2	51.2
Accrued Unbilled Revenues		37.1	17.9
Miscellaneous		2.0	2.2
Allowance for Uncollectible Accounts		(4.7)	(4.3)
Total Accounts Receivable		214.0	187.9
Fuel		147.7	119.3
Materials and Supplies		104.1	127.0
Risk Management Assets		11.2	14.7
Risk Management Assets, Affiliated		0.7	0.9
Accrued Tax Benefits		5.4	30.6
Regulatory Asset for Under-Recovered Fuel Costs		82.2	86.9
Prepayments and Other Current Assets		21.4	17.4
TOTAL CURRENT ASSETS		625.4	627.9
Property, Plant and Equipment
Generation		6,251.2	6,200.8
Transmission		2,414.6	2,408.1
Distribution		3,432.8	3,402.5
Other Property, Plant and Equipment		357.2	345.5
Construction Work in Progress		507.0	475.1
Total Property, Plant and Equipment		12,962.8	12,832.0
Accumulated Depreciation and Amortization		3,473.5	3,407.6
TOTAL PROPERTY, PLANT AND EQUIPMENT - NET		9,489.3	9,424.4
Other Noncurrent Assets
Regulatory Assets		1,125.7	1,154.2
Securitized Assets		322.4	328.0
Long-term Risk Management Assets		0.3	0.1
Deferred Charges and Other Noncurrent Assets		139.0	113.7
TOTAL OTHER NONCURRENT ASSETS		1,587.4	1,596.0
TOTAL ASSETS		11,702.1	11,648.3
Current Liabilities
Advances from Affiliates		171.2	181.0
Accounts Payable		182.0	196.5
Affiliated Companies		62.1	67.7
Short-term Debt:
Long-term Debt Due Within One Year		318.3	318.0
Risk Management Liabilities		10.4	4.8
Customer Deposits		82.7	83.9
Accrued Taxes		108.8	79.5
Accrued Interest		62.9	40.6
Other Current Liabilities		120.5	153.4
TOTAL CURRENT LIABILITIES		1,118.9	1,125.4
Noncurrent Liabilities
Long-term Debt		3,601.0	3,612.7
Long-term Risk Management Liabilities		0.1	0.1
Deferred Income Taxes		2,558.5	2,527.0
Regulatory Liabilities and Deferred Investment Tax Credits		628.7	637.1
Asset Retirement Obligations		94.9	98.9
Employee Benefits and Pension Obligations		112.1	114.4
Deferred Credits and Other Noncurrent Liabilities		62.1	57.7
TOTAL NONCURRENT LIABILITIES		7,057.4	7,047.9
TOTAL LIABILITIES		$ 8,176.3	$ 8,173.3
Rate Matters
Commitments and Contingencies
Equity
Common Stock		$ 260.4	$ 260.4
Paid-in Capital		1,828.7	1,828.7
Retained Earnings		1,440.0	1,388.7
Accumulated Other Comprehensive Income (Loss)		(3.3)	(2.8)
TOTAL EQUITY		3,525.8	3,475.0
TOTAL LIABILITIES AND EQUITY		11,702.1	11,648.3
Indiana Michigan Power Co [Member]
Current Assets
Cash and Cash Equivalents		3.3	1.1
Advances to Affiliates		12.3	11.7
Accounts Receivable:
Customers		54.6	43.9
Affiliated Companies		58.6	68.7
Accrued Unbilled Revenues		1.3	0.1
Miscellaneous		1.4	2.6
Allowance for Uncollectible Accounts		0.0	(0.1)
Total Accounts Receivable		115.9	115.2
Fuel		63.7	46.5
Materials and Supplies		155.0	185.9
Risk Management Assets		8.4	10.6
Risk Management Assets, Affiliated		0.7	1.7
Accrued Tax Benefits		47.0	40.5
Prepayments and Other Current Assets		50.9	42.1
TOTAL CURRENT ASSETS		457.2	455.3
Property, Plant and Equipment
Generation		3,899.0	3,841.7
Transmission		1,410.2	1,406.9
Distribution		1,811.6	1,790.8
Other Property, Plant and Equipment		672.5	662.3
Construction Work in Progress		547.9	519.8
Total Property, Plant and Equipment		8,341.2	8,221.5
Accumulated Depreciation and Amortization		3,048.3	3,018.0
TOTAL PROPERTY, PLANT AND EQUIPMENT - NET		5,292.9	5,203.5
Other Noncurrent Assets
Regulatory Assets		813.8	804.3
Spent Nuclear Fuel and Decommissioning Trusts		2,152.4	2,106.4
Long-term Risk Management Assets		0.4	0.0
Deferred Charges and Other Noncurrent Assets		161.3	140.9
TOTAL OTHER NONCURRENT ASSETS		3,127.9	3,051.6
TOTAL ASSETS		8,878.0	8,710.4
Current Liabilities
Advances from Affiliates		9.5	294.3
Accounts Payable		176.3	201.0
Affiliated Companies		47.8	61.8
Short-term Debt:
Long-term Debt Due Within One Year		151.5	162.9
Risk Management Liabilities		6.4	6.3
Customer Deposits		35.6	35.7
Accrued Taxes		83.2	74.2
Accrued Interest		12.2	26.2
Obligations Under Capital Leases		25.2	32.8
Other Current Liabilities		118.2	142.1
TOTAL CURRENT LIABILITIES		665.9	1,037.3
Noncurrent Liabilities
Long-term Debt		2,215.1	1,837.1
Long-term Risk Management Liabilities		1.0	1.6
Deferred Income Taxes		1,421.0	1,361.5
Regulatory Liabilities and Deferred Investment Tax Credits		1,104.6	1,076.2
Asset Retirement Obligations		1,264.8	1,240.9
Deferred Credits and Other Noncurrent Liabilities		125.4	119.4
TOTAL NONCURRENT LIABILITIES		6,131.9	5,636.7
TOTAL LIABILITIES		$ 6,797.8	$ 6,674.0
Rate Matters
Commitments and Contingencies
Equity
Common Stock		$ 56.6	$ 56.6
Paid-in Capital		980.9	980.9
Retained Earnings		1,059.0	1,015.6
Accumulated Other Comprehensive Income (Loss)		(16.3)	(16.7)
TOTAL EQUITY		2,080.2	2,036.4
TOTAL LIABILITIES AND EQUITY		8,878.0	8,710.4
Ohio Power Co [Member]
Current Assets
Cash and Cash Equivalents		9.3	3.1
Restricted Cash for Securitized Funding		16.2	27.7
Advances to Affiliates		221.9	331.1
Accounts Receivable:
Customers		43.0	46.4
Affiliated Companies		60.0	64.3
Accrued Unbilled Revenues		13.3	1.4
Miscellaneous		1.1	0.4
Allowance for Uncollectible Accounts		(0.4)	(0.2)
Total Accounts Receivable		117.0	112.3
Materials and Supplies		71.0	86.1
Prepayments and Other Current Assets		12.1	12.9
TOTAL CURRENT ASSETS		447.5	573.2
Property, Plant and Equipment
Transmission		2,267.1	2,235.6
Distribution		4,324.8	4,287.7
Other Property, Plant and Equipment		423.1	408.2
Construction Work in Progress		160.2	171.9
Total Property, Plant and Equipment		7,175.2	7,103.4
Accumulated Depreciation and Amortization		2,070.4	2,048.7
TOTAL PROPERTY, PLANT AND EQUIPMENT - NET		5,104.8	5,054.7
Other Noncurrent Assets
Notes Receivable - Affiliated		32.3	32.3
Regulatory Assets		1,056.5	1,113.0
Securitized Assets		79.9	85.9
Long-term Risk Management Assets		0.0	19.2
Deferred Charges and Other Noncurrent Assets		225.9	259.6
TOTAL OTHER NONCURRENT ASSETS		1,394.6	1,510.0
TOTAL ASSETS		6,946.9	7,137.9
Current Liabilities
Accounts Payable		131.5	156.4
Affiliated Companies		74.6	88.7
Short-term Debt:
Long-term Debt Due Within One Year		395.6	395.9
Risk Management Liabilities		5.5	3.6
Customer Deposits		89.4	65.4
Accrued Taxes		379.1	528.3
Accrued Interest		45.4	33.0
Other Current Liabilities		118.8	154.3
TOTAL CURRENT LIABILITIES		1,239.9	1,425.6
Noncurrent Liabilities
Long-term Debt		1,739.9	1,761.8
Long-term Risk Management Liabilities		5.8	0.0
Deferred Income Taxes		1,395.1	1,383.2
Regulatory Liabilities and Deferred Investment Tax Credits		521.2	514.2
Employee Benefits and Pension Obligations		35.6	35.8
Deferred Credits and Other Noncurrent Liabilities		28.0	30.7
TOTAL NONCURRENT LIABILITIES		3,725.6	3,725.7
TOTAL LIABILITIES		$ 4,965.5	$ 5,151.3
Rate Matters
Commitments and Contingencies
Equity
Common Stock		$ 321.2	$ 321.2
Paid-in Capital		838.8	838.8
Retained Earnings		817.5	822.3
Accumulated Other Comprehensive Income (Loss)		3.9	4.3
TOTAL EQUITY		1,981.4	1,986.6
TOTAL LIABILITIES AND EQUITY		6,946.9	7,137.9
Public Service Co Of Oklahoma [Member]
Current Assets
Cash and Cash Equivalents		3.2	1.4
Advances to Affiliates		8.4	80.6
Accounts Receivable:
Customers		26.5	26.0
Affiliated Companies		16.2	20.8
Miscellaneous		2.5	3.3
Allowance for Uncollectible Accounts		(0.7)	(0.6)
Total Accounts Receivable		44.5	49.5
Fuel		21.2	17.6
Materials and Supplies		51.8	51.9
Risk Management Assets		0.7	0.6
Accrued Tax Benefits		34.8	37.3
Prepayments and Other Current Assets		6.6	6.5
TOTAL CURRENT ASSETS		171.2	245.4
Property, Plant and Equipment
Generation		1,496.7	1,302.6
Transmission		822.4	815.4
Distribution		2,240.3	2,206.7
Other Property, Plant and Equipment		414.4	405.7
Construction Work in Progress		145.7	315.3
Total Property, Plant and Equipment		5,119.5	5,045.7
Accumulated Depreciation and Amortization		1,365.7	1,352.5
TOTAL PROPERTY, PLANT AND EQUIPMENT - NET		3,753.8	3,693.2
Other Noncurrent Assets
Regulatory Assets		224.9	214.8
Employee Benefits and Pension Assets		11.1	10.6
Deferred Charges and Other Noncurrent Assets		32.1	6.4
TOTAL OTHER NONCURRENT ASSETS		268.1	231.8
TOTAL ASSETS		4,193.1	4,170.4
Current Liabilities
Accounts Payable		87.0	108.2
Affiliated Companies		43.2	51.5
Short-term Debt:
Long-term Debt Due Within One Year		275.4	275.4
Risk Management Liabilities		0.2	0.2
Customer Deposits		50.6	50.3
Accrued Taxes		38.7	23.6
Accrued Interest		14.5	15.1
Regulatory Liability for Over-Recovered Fuel Costs		67.8	76.1
Other Current Liabilities		60.8	64.4
TOTAL CURRENT LIABILITIES		638.2	664.8
Noncurrent Liabilities
Long-term Debt		1,010.9	1,010.7
Deferred Income Taxes		1,005.1	971.8
Regulatory Liabilities and Deferred Investment Tax Credits		335.8	335.1
Asset Retirement Obligations		40.5	39.9
Employee Benefits and Pension Obligations		15.0	14.5
Deferred Credits and Other Noncurrent Liabilities		12.2	13.7
TOTAL NONCURRENT LIABILITIES		2,419.5	2,385.7
TOTAL LIABILITIES		$ 3,057.7	$ 3,050.5
Rate Matters
Commitments and Contingencies
Equity
Common Stock		$ 157.2	$ 157.2
Paid-in Capital		364.0	364.0
Retained Earnings		610.2	594.5
Accumulated Other Comprehensive Income (Loss)		4.0	4.2
TOTAL EQUITY		1,135.4	1,119.9
TOTAL LIABILITIES AND EQUITY		4,193.1	4,170.4
Southwestern Electric Power Co [Member]
Current Assets
Cash and Cash Equivalents		12.3	5.2
Advances to Affiliates		2.0	2.0
Accounts Receivable:
Customers		45.9	40.2
Affiliated Companies		20.0	22.0
Miscellaneous		21.3	27.1
Allowance for Uncollectible Accounts		(1.4)	(0.9)
Total Accounts Receivable		85.8	88.4
Fuel		129.3	142.1
Materials and Supplies		70.6	71.5
Risk Management Assets		0.8	0.8
Accrued Tax Benefits		37.3	0.0
Regulatory Asset for Under-Recovered Fuel Costs		2.5	4.1
Prepayments and Other Current Assets		27.8	21.2
TOTAL CURRENT ASSETS		368.4	335.3
Property, Plant and Equipment
Generation		4,190.5	3,943.5
Transmission		1,396.4	1,387.8
Distribution		1,966.6	1,957.3
Other Property, Plant and Equipment		893.2	883.5
Construction Work in Progress		562.8	751.3
Total Property, Plant and Equipment		9,009.5	8,923.4
Accumulated Depreciation and Amortization		2,620.9	2,602.3
TOTAL PROPERTY, PLANT AND EQUIPMENT - NET		6,388.6	6,321.1
Other Noncurrent Assets
Regulatory Assets		422.0	415.8
Deferred Charges and Other Noncurrent Assets		120.4	75.8
TOTAL OTHER NONCURRENT ASSETS		542.4	491.6
TOTAL ASSETS		7,299.4	7,148.0
Current Liabilities
Advances from Affiliates		217.8	58.3
Accounts Payable		140.3	150.4
Affiliated Companies		61.0	78.8
Short-term Debt:
Long-term Debt Due Within One Year		253.3	3.3
Risk Management Liabilities		3.5	3.1
Customer Deposits		62.5	61.4
Accrued Taxes		82.4	58.3
Accrued Interest		22.2	43.0
Obligations Under Capital Leases		25.3	21.9
Other Current Liabilities		86.6	110.7
TOTAL CURRENT LIABILITIES		954.9	589.2
Noncurrent Liabilities
Long-term Debt		2,019.1	2,270.2
Long-term Risk Management Liabilities		1.8	2.1
Deferred Income Taxes		1,455.1	1,399.8
Regulatory Liabilities and Deferred Investment Tax Credits		447.0	448.8
Asset Retirement Obligations		114.4	117.5
Employee Benefits and Pension Obligations		28.1	25.8
Obligations Under Capital Leases		73.6	75.6
Deferred Credits and Other Noncurrent Liabilities		42.1	49.3
TOTAL NONCURRENT LIABILITIES		4,181.2	4,389.1
TOTAL LIABILITIES		$ 5,136.1	$ 4,978.3
Rate Matters
Commitments and Contingencies
Equity
Common Stock		$ 135.7	$ 135.7
Paid-in Capital		676.6	676.6
Retained Earnings		1,359.7	1,366.3
Accumulated Other Comprehensive Income (Loss)		(9.1)	(9.4)
TOTAL COMMON SHAREHOLDER'S EQUITY		2,162.9	2,169.2
Noncontrolling Interests		0.4	0.5
TOTAL EQUITY		2,163.3	2,169.7
TOTAL LIABILITIES AND EQUITY		$ 7,299.4	$ 7,148.0

[1] Amount of securitized debt for receivables as accounted for under the “Transfers and Servicing” accounting guidance.