Condensed Consolidated Balance Sheets - USD ($) $ in Millions		Jun. 30, 2016	Dec. 31, 2015
Current Assets
Cash and Cash Equivalents		$ 246.8	$ 176.4
Other Temporary Investments		306.9	386.8
Accounts Receivable:
Customers		692.4	615.9
Accrued Unbilled Revenues		99.0	31.2
Pledged Accounts Receivable - AEP Credit		989.0	940.3
Miscellaneous		71.7	82.1
Allowance for Uncollectible Accounts		(36.9)	(29.0)
Total Accounts Receivable		1,815.2	1,640.5
Fuel		716.4	600.8
Materials and Supplies		645.6	738.6
Risk Management Assets		111.1	134.4
Accrued Tax Benefits		272.7	58.9
Regulatory Asset for Under-Recovered Fuel Costs		106.5	115.2
Margin Deposits		72.5	107.3
Prepayments and Other Current Assets		145.2	113.5
TOTAL CURRENT ASSETS		4,438.9	4,072.4
Property, Plant and Equipment
Generation		26,746.2	25,559.8
Transmission		14,878.6	14,247.9
Distribution		18,431.1	18,046.9
Other Property, Plant and Equipment		3,516.6	3,722.9
Construction Work in Progress		3,509.9	3,903.9
Total Property, Plant and Equipment		67,082.4	65,481.4
Accumulated Depreciation and Amortization		19,646.2	19,348.2
TOTAL PROPERTY, PLANT AND EQUIPMENT - NET		47,436.2	46,133.2
Other Noncurrent Assets
Regulatory Assets		5,259.1	5,140.3
Securitized Assets		1,631.9	1,749.9
Spent Nuclear Fuel and Decommissioning Trusts		2,196.0	2,106.4
Goodwill		52.5	52.5
Long-term Risk Management Assets		298.5	321.8
Deferred Charges and Other Noncurrent Assets		2,004.0	2,106.6
TOTAL OTHER NONCURRENT ASSETS		11,442.0	11,477.5
TOTAL ASSETS		63,317.1	61,683.1
Current Liabilities
Accounts Payable		1,242.3	1,418.0
Short-term Debt:
Securitized Debt for Receivables - AEP Credit	[1]	651.0	675.0
Other Short-term Debt		1,409.3	125.0
Total Short-term Debt		2,060.3	800.0
Long-term Debt Due Within One Year		2,006.3	1,831.8
Risk Management Liabilities		85.7	87.1
Customer Deposits		335.8	346.6
Accrued Taxes		814.0	979.1
Accrued Interest		227.0	226.9
Regulatory Liability for Over-Recovered Fuel Costs		59.9	113.9
Other Current Liabilities		1,038.6	1,305.1
TOTAL CURRENT LIABILITIES		7,869.9	7,108.5
Noncurrent Liabilities
Long-term Debt		17,537.4	17,740.9
Long-term Risk Management Liabilities		166.8	179.1
Deferred Income Taxes		12,402.5	11,733.2
Regulatory Liabilities and Deferred Investment Tax Credits		3,816.0	3,736.1
Asset Retirement Obligations		1,851.9	1,806.5
Employee Benefits and Pension Obligations		496.6	583.3
Deferred Credits and Other Noncurrent Liabilities		771.1	890.6
TOTAL NONCURRENT LIABILITIES		37,042.3	36,669.7
TOTAL LIABILITIES		44,912.2	43,778.2
Rate Matters
Commitments and Contingencies
Equity
Common Stock		3,328.0	3,324.0
Paid-in Capital		6,324.7	6,296.5
Retained Earnings		8,851.4	8,398.3
Accumulated Other Comprehensive Income (Loss)		(117.9)	(127.1)
TOTAL COMMON SHAREHOLDER'S EQUITY		18,386.2	17,891.7
Noncontrolling Interests		18.7	13.2
TOTAL EQUITY		18,404.9	17,904.9
TOTAL LIABILITIES AND EQUITY		63,317.1	61,683.1
Appalachian Power Co [Member]
Current Assets
Cash and Cash Equivalents		5.4	2.8
Restricted Cash for Securitized Funding		15.0	14.8
Advances to Affiliates		24.6	25.6
Accounts Receivable:
Customers		116.1	120.9
Affiliated Companies		58.1	51.2
Accrued Unbilled Revenues		33.2	17.9
Miscellaneous		1.6	2.2
Allowance for Uncollectible Accounts		(4.4)	(4.3)
Total Accounts Receivable		204.6	187.9
Fuel		154.0	119.3
Materials and Supplies		101.2	127.0
Risk Management Assets		5.2	14.7
Risk Management Assets - Affiliated		0.0	0.9
Accrued Tax Benefits		14.6	30.6
Regulatory Asset for Under-Recovered Fuel Costs		86.8	86.9
Prepayments and Other Current Assets		13.8	17.4
TOTAL CURRENT ASSETS		625.2	627.9
Property, Plant and Equipment
Generation		6,312.9	6,200.8
Transmission		2,476.6	2,408.1
Distribution		3,474.4	3,402.5
Other Property, Plant and Equipment		362.6	345.5
Construction Work in Progress		479.5	475.1
Total Property, Plant and Equipment		13,106.0	12,832.0
Accumulated Depreciation and Amortization		3,527.6	3,407.6
TOTAL PROPERTY, PLANT AND EQUIPMENT - NET		9,578.4	9,424.4
Other Noncurrent Assets
Regulatory Assets		1,143.7	1,154.2
Securitized Assets		316.6	328.0
Long-term Risk Management Assets		0.2	0.1
Deferred Charges and Other Noncurrent Assets		126.0	113.7
TOTAL OTHER NONCURRENT ASSETS		1,586.5	1,596.0
TOTAL ASSETS		11,790.1	11,648.3
Current Liabilities
Advances from Affiliates		145.9	181.0
Accounts Payable		161.4	196.5
Affiliated Companies		70.1	67.7
Short-term Debt:
Long-term Debt Due Within One Year		568.3	318.0
Risk Management Liabilities		18.5	4.8
Customer Deposits		83.1	83.9
Accrued Taxes		72.2	79.5
Accrued Interest		40.7	40.6
Other Current Liabilities		144.1	153.4
TOTAL CURRENT LIABILITIES		1,304.3	1,125.4
Noncurrent Liabilities
Long-term Debt		3,476.2	3,612.7
Long-term Risk Management Liabilities		0.3	0.1
Deferred Income Taxes		2,595.1	2,527.0
Regulatory Liabilities and Deferred Investment Tax Credits		626.8	637.1
Asset Retirement Obligations		100.6	98.9
Employee Benefits and Pension Obligations		103.3	114.4
Deferred Credits and Other Noncurrent Liabilities		59.9	57.7
TOTAL NONCURRENT LIABILITIES		6,962.2	7,047.9
TOTAL LIABILITIES		8,266.5	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		1,438.4	1,388.7
Accumulated Other Comprehensive Income (Loss)		(3.9)	(2.8)
TOTAL EQUITY		3,523.6	3,475.0
TOTAL LIABILITIES AND EQUITY		11,790.1	11,648.3
Indiana Michigan Power Co [Member]
Current Assets
Cash and Cash Equivalents		2.5	1.1
Advances to Affiliates		12.4	11.7
Accounts Receivable:
Customers		57.6	43.9
Affiliated Companies		57.9	68.7
Accrued Unbilled Revenues		3.6	0.1
Miscellaneous		0.8	2.6
Allowance for Uncollectible Accounts		0.0	(0.1)
Total Accounts Receivable		119.9	115.2
Fuel		64.4	46.5
Materials and Supplies		158.0	185.9
Risk Management Assets		5.0	10.6
Risk Management Assets - Affiliated		0.1	1.7
Accrued Tax Benefits		45.8	40.5
Prepayments and Other Current Assets		48.3	42.1
TOTAL CURRENT ASSETS		456.4	455.3
Property, Plant and Equipment
Generation		3,956.0	3,841.7
Transmission		1,426.3	1,406.9
Distribution		1,839.9	1,790.8
Other Property, Plant and Equipment		691.0	662.3
Construction Work in Progress		564.1	519.8
Total Property, Plant and Equipment		8,477.3	8,221.5
Accumulated Depreciation and Amortization		3,065.9	3,018.0
TOTAL PROPERTY, PLANT AND EQUIPMENT - NET		5,411.4	5,203.5
Other Noncurrent Assets
Regulatory Assets		836.9	804.3
Spent Nuclear Fuel and Decommissioning Trusts		2,196.0	2,106.4
Long-term Risk Management Assets		0.2	0.0
Deferred Charges and Other Noncurrent Assets		148.0	140.9
TOTAL OTHER NONCURRENT ASSETS		3,181.1	3,051.6
TOTAL ASSETS		9,048.9	8,710.4
Current Liabilities
Advances from Affiliates		11.4	294.3
Accounts Payable		174.9	201.0
Affiliated Companies		63.5	61.8
Short-term Debt:
Long-term Debt Due Within One Year		174.2	162.9
Risk Management Liabilities		3.6	6.3
Customer Deposits		34.3	35.7
Accrued Taxes		70.9	74.2
Accrued Interest		32.3	26.2
Obligations Under Capital Leases		16.6	32.8
Other Current Liabilities		119.1	142.1
TOTAL CURRENT LIABILITIES		700.8	1,037.3
Noncurrent Liabilities
Long-term Debt		2,256.1	1,837.1
Long-term Risk Management Liabilities		0.4	1.6
Deferred Income Taxes		1,471.9	1,361.5
Regulatory Liabilities and Deferred Investment Tax Credits		1,130.8	1,076.2
Asset Retirement Obligations		1,277.1	1,240.9
Deferred Credits and Other Noncurrent Liabilities		111.2	119.4
TOTAL NONCURRENT LIABILITIES		6,247.5	5,636.7
TOTAL LIABILITIES		6,948.3	6,674.0
Rate Matters
Commitments and Contingencies
Equity
Common Stock		56.6	56.6
Paid-in Capital		980.9	980.9
Retained Earnings		1,079.1	1,015.6
Accumulated Other Comprehensive Income (Loss)		(16.0)	(16.7)
TOTAL EQUITY		2,100.6	2,036.4
TOTAL LIABILITIES AND EQUITY		9,048.9	8,710.4
Ohio Power Co [Member]
Current Assets
Cash and Cash Equivalents		6.3	3.1
Restricted Cash for Securitized Funding		27.2	27.7
Advances to Affiliates		0.0	331.1
Accounts Receivable:
Customers		37.1	46.4
Affiliated Companies		53.2	64.3
Accrued Unbilled Revenues		12.9	1.4
Miscellaneous		0.7	0.4
Allowance for Uncollectible Accounts		(0.2)	(0.2)
Total Accounts Receivable		103.7	112.3
Materials and Supplies		52.6	61.5
Emission Allowances		16.5	24.6
Prepayments and Other Current Assets		18.6	12.9
TOTAL CURRENT ASSETS		224.9	573.2
Property, Plant and Equipment
Transmission		2,286.8	2,235.6
Distribution		4,363.0	4,287.7
Other Property, Plant and Equipment		431.5	408.2
Construction Work in Progress		169.5	171.9
Total Property, Plant and Equipment		7,250.8	7,103.4
Accumulated Depreciation and Amortization		2,089.3	2,048.7
TOTAL PROPERTY, PLANT AND EQUIPMENT - NET		5,161.5	5,054.7
Other Noncurrent Assets
Notes Receivable - Affiliated		32.3	32.3
Regulatory Assets		1,004.3	1,113.0
Securitized Assets		73.9	85.9
Long-term Risk Management Assets		0.1	19.2
Deferred Charges and Other Noncurrent Assets		172.0	259.6
TOTAL OTHER NONCURRENT ASSETS		1,282.6	1,510.0
TOTAL ASSETS		6,669.0	7,137.9
Current Liabilities
Advances from Affiliates		177.1	0.0
Accounts Payable		136.6	156.4
Affiliated Companies		93.8	88.7
Short-term Debt:
Long-term Debt Due Within One Year		45.6	395.9
Risk Management Liabilities		5.7	3.6
Customer Deposits		63.7	65.4
Accrued Taxes		303.9	528.3
Accrued Interest		31.3	33.0
Other Current Liabilities		97.1	154.3
TOTAL CURRENT LIABILITIES		954.8	1,425.6
Noncurrent Liabilities
Long-term Debt		1,740.4	1,761.8
Long-term Risk Management Liabilities		9.0	0.0
Deferred Income Taxes		1,407.5	1,383.2
Regulatory Liabilities and Deferred Investment Tax Credits		521.0	514.2
Employee Benefits and Pension Obligations		27.9	35.8
Deferred Credits and Other Noncurrent Liabilities		27.8	30.7
TOTAL NONCURRENT LIABILITIES		3,733.6	3,725.7
TOTAL LIABILITIES		4,688.4	5,151.3
Rate Matters
Commitments and Contingencies
Equity
Common Stock		321.2	321.2
Paid-in Capital		838.8	838.8
Retained Earnings		817.1	822.3
Accumulated Other Comprehensive Income (Loss)		3.5	4.3
TOTAL EQUITY		1,980.6	1,986.6
TOTAL LIABILITIES AND EQUITY		6,669.0	7,137.9
Public Service Co Of Oklahoma [Member]
Current Assets
Cash and Cash Equivalents		3.3	1.4
Advances to Affiliates		33.5	80.6
Accounts Receivable:
Customers		26.5	26.0
Affiliated Companies		27.1	20.8
Miscellaneous		4.6	3.3
Allowance for Uncollectible Accounts		(0.4)	(0.6)
Total Accounts Receivable		57.8	49.5
Fuel		22.7	17.6
Materials and Supplies		52.4	51.9
Risk Management Assets		1.2	0.6
Accrued Tax Benefits		30.3	37.3
Prepayments and Other Current Assets		7.8	6.5
TOTAL CURRENT ASSETS		209.0	245.4
Property, Plant and Equipment
Generation		1,509.5	1,302.6
Transmission		826.5	815.4
Distribution		2,259.0	2,206.7
Other Property, Plant and Equipment		239.1	405.7
Construction Work in Progress		161.8	315.3
Total Property, Plant and Equipment		4,995.9	5,045.7
Accumulated Depreciation and Amortization		1,289.1	1,352.5
TOTAL PROPERTY, PLANT AND EQUIPMENT - NET		3,706.8	3,693.2
Other Noncurrent Assets
Regulatory Assets		321.5	214.8
Employee Benefits and Pension Assets		15.7	10.6
Deferred Charges and Other Noncurrent Assets		25.9	6.4
TOTAL OTHER NONCURRENT ASSETS		363.1	231.8
TOTAL ASSETS		4,278.9	4,170.4
Current Liabilities
Accounts Payable		101.3	108.2
Affiliated Companies		62.2	51.5
Short-term Debt:
Long-term Debt Due Within One Year		125.4	275.4
Risk Management Liabilities		0.0	0.2
Customer Deposits		50.3	50.3
Accrued Taxes		38.2	23.6
Accrued Interest		14.5	15.1
Regulatory Liability for Over-Recovered Fuel Costs		42.6	76.1
Other Current Liabilities		62.4	64.4
TOTAL CURRENT LIABILITIES		496.9	664.8
Noncurrent Liabilities
Long-term Debt		1,161.0	1,010.7
Deferred Income Taxes		1,037.7	971.8
Regulatory Liabilities and Deferred Investment Tax Credits		340.0	335.1
Asset Retirement Obligations		48.8	39.9
Employee Benefits and Pension Obligations		14.1	14.5
Deferred Credits and Other Noncurrent Liabilities		16.3	13.7
TOTAL NONCURRENT LIABILITIES		2,617.9	2,385.7
TOTAL LIABILITIES		3,114.8	3,050.5
Rate Matters
Commitments and Contingencies
Equity
Common Stock		157.2	157.2
Paid-in Capital		364.0	364.0
Retained Earnings		639.1	594.5
Accumulated Other Comprehensive Income (Loss)		3.8	4.2
TOTAL EQUITY		1,164.1	1,119.9
TOTAL LIABILITIES AND EQUITY		4,278.9	4,170.4
Southwestern Electric Power Co [Member]
Current Assets
Cash and Cash Equivalents		14.0	5.2
Advances to Affiliates		2.0	2.0
Accounts Receivable:
Customers		39.9	40.2
Affiliated Companies		31.2	22.0
Miscellaneous		20.3	27.1
Allowance for Uncollectible Accounts		(1.0)	(0.9)
Total Accounts Receivable		90.4	88.4
Fuel		126.3	142.1
Materials and Supplies		70.5	71.5
Risk Management Assets		1.4	0.8
Accrued Tax Benefits		25.3	0.0
Regulatory Asset for Under-Recovered Fuel Costs		0.0	4.1
Prepayments and Other Current Assets		24.9	21.2
TOTAL CURRENT ASSETS		354.8	335.3
Property, Plant and Equipment
Generation		4,573.2	3,943.5
Transmission		1,477.4	1,387.8
Distribution		1,976.5	1,957.3
Other Property, Plant and Equipment		720.1	883.5
Construction Work in Progress		168.4	751.3
Total Property, Plant and Equipment		8,915.6	8,923.4
Accumulated Depreciation and Amortization		2,549.0	2,602.3
TOTAL PROPERTY, PLANT AND EQUIPMENT - NET		6,366.6	6,321.1
Other Noncurrent Assets
Regulatory Assets		502.6	415.8
Deferred Charges and Other Noncurrent Assets		116.1	75.8
TOTAL OTHER NONCURRENT ASSETS		618.7	491.6
TOTAL ASSETS		7,340.1	7,148.0
Current Liabilities
Advances from Affiliates		155.1	58.3
Accounts Payable		136.1	150.4
Affiliated Companies		75.5	78.8
Short-term Debt:
Long-term Debt Due Within One Year		253.3	3.3
Risk Management Liabilities		2.3	3.1
Customer Deposits		61.9	61.4
Accrued Taxes		76.1	58.3
Accrued Interest		42.4	43.0
Obligations Under Capital Leases		23.3	21.9
Other Current Liabilities		90.1	110.7
TOTAL CURRENT LIABILITIES		916.1	589.2
Noncurrent Liabilities
Long-term Debt		2,019.5	2,270.2
Long-term Risk Management Liabilities		0.4	2.1
Deferred Income Taxes		1,513.0	1,399.8
Regulatory Liabilities and Deferred Investment Tax Credits		450.5	448.8
Asset Retirement Obligations		127.2	117.5
Employee Benefits and Pension Obligations		26.7	25.8
Obligations Under Capital Leases		71.1	75.6
Deferred Credits and Other Noncurrent Liabilities		38.9	49.3
TOTAL NONCURRENT LIABILITIES		4,247.3	4,389.1
TOTAL LIABILITIES		5,163.4	4,978.3
Rate Matters
Commitments and Contingencies
Equity
Common Stock		135.7	135.7
Paid-in Capital		676.6	676.6
Retained Earnings		1,372.9	1,366.3
Accumulated Other Comprehensive Income (Loss)		(8.9)	(9.4)
TOTAL COMMON SHAREHOLDER'S EQUITY		2,176.3	2,169.2
Noncontrolling Interests		0.4	0.5
TOTAL EQUITY		2,176.7	2,169.7
TOTAL LIABILITIES AND EQUITY		$ 7,340.1	$ 7,148.0

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