Condensed Consolidated Balance Sheets - USD ($) $ in Millions		Sep. 30, 2016	Dec. 31, 2015
Current Assets
Cash and Cash Equivalents		$ 212.2	$ 176.4
Other Temporary Investments		279.2	386.8
Accounts Receivable:
Customers		628.4	615.9
Accrued Unbilled Revenues		166.7	31.2
Pledged Accounts Receivable - AEP Credit		1,065.5	940.3
Miscellaneous		59.9	82.1
Allowance for Uncollectible Accounts		(40.5)	(29.0)
Total Accounts Receivable		1,880.0	1,640.5
Fuel		468.0	600.8
Materials and Supplies		556.8	738.6
Risk Management Assets		110.8	134.4
Accrued Tax Benefits		214.9	58.9
Regulatory Asset for Under-Recovered Fuel Costs		107.4	115.2
Margin Deposits		56.5	107.3
Assets Held for Sale		1,915.3	0.0
Prepayments and Other Current Assets		148.1	113.5
TOTAL CURRENT ASSETS		5,949.2	4,072.4
Property, Plant and Equipment
Generation		19,684.2	25,559.8
Transmission		15,157.8	14,247.9
Distribution		18,639.0	18,046.9
Other Property, Plant and Equipment		3,467.5	3,722.9
Construction Work in Progress		3,651.3	3,903.9
Total Property, Plant and Equipment		60,599.8	65,481.4
Accumulated Depreciation and Amortization		16,337.6	19,348.2
TOTAL PROPERTY, PLANT AND EQUIPMENT - NET		44,262.2	46,133.2
Other Noncurrent Assets
Regulatory Assets		5,182.4	5,140.3
Securitized Assets		1,559.0	1,749.9
Spent Nuclear Fuel and Decommissioning Trusts		2,230.8	2,106.4
Goodwill		52.5	52.5
Long-term Risk Management Assets		311.7	321.8
Deferred Charges and Other Noncurrent Assets		1,894.2	2,106.6
TOTAL OTHER NONCURRENT ASSETS		11,230.6	11,477.5
TOTAL ASSETS		61,442.0	61,683.1
Current Liabilities
Accounts Payable		1,340.3	1,418.0
Short-term Debt:
Securitized Debt for Receivables - AEP Credit	[1]	750.0	675.0
Other Short-term Debt		728.3	125.0
Total Short-term Debt		1,478.3	800.0
Long-term Debt Due Within One Year		2,384.8	1,831.8
Risk Management Liabilities		79.3	87.1
Customer Deposits		341.6	346.6
Accrued Taxes		666.2	979.1
Accrued Interest		230.2	226.9
Regulatory Liability for Over-Recovered Fuel Costs		7.9	113.9
Liabilities Held for Sale		231.0	0.0
Other Current Liabilities		1,019.8	1,305.1
TOTAL CURRENT LIABILITIES		7,779.4	7,108.5
Noncurrent Liabilities
Long-term Debt		17,319.9	17,740.9
Long-term Risk Management Liabilities		240.0	179.1
Deferred Income Taxes		11,815.1	11,733.2
Regulatory Liabilities and Deferred Investment Tax Credits		3,887.5	3,736.1
Asset Retirement Obligations		1,858.0	1,806.5
Employee Benefits and Pension Obligations		497.0	583.3
Deferred Credits and Other Noncurrent Liabilities		702.1	890.6
TOTAL NONCURRENT LIABILITIES		36,319.6	36,669.7
TOTAL LIABILITIES		44,099.0	43,778.2
Rate Matters
Commitments and Contingencies
Equity
Common Stock		3,328.3	3,324.0
Paid-in Capital		6,330.0	6,296.5
Retained Earnings		7,809.4	8,398.3
Accumulated Other Comprehensive Income (Loss)		(145.8)	(127.1)
TOTAL COMMON SHAREHOLDER'S EQUITY		17,321.9	17,891.7
Noncontrolling Interests		21.1	13.2
TOTAL EQUITY		17,343.0	17,904.9
TOTAL LIABILITIES AND EQUITY		61,442.0	61,683.1
Appalachian Power Co [Member]
Current Assets
Cash and Cash Equivalents		3.3	2.8
Restricted Cash for Securitized Funding		7.8	14.8
Advances to Affiliates		24.4	25.6
Accounts Receivable:
Customers		115.4	120.9
Affiliated Companies		54.3	51.2
Accrued Unbilled Revenues		42.3	17.9
Miscellaneous		1.1	2.2
Allowance for Uncollectible Accounts		(4.7)	(4.3)
Total Accounts Receivable		208.4	187.9
Fuel		124.8	119.3
Materials and Supplies		100.0	127.0
Risk Management Assets		3.2	14.7
Risk Management Assets - Affiliated		0.0	0.9
Accrued Tax Benefits		16.0	30.6
Regulatory Asset for Under-Recovered Fuel Costs		71.6	86.9
Prepayments and Other Current Assets		17.4	17.4
TOTAL CURRENT ASSETS		576.9	627.9
Property, Plant and Equipment
Generation		6,319.5	6,200.8
Transmission		2,555.3	2,408.1
Distribution		3,519.2	3,402.5
Other Property, Plant and Equipment		368.7	345.5
Construction Work in Progress		481.9	475.1
Total Property, Plant and Equipment		13,244.6	12,832.0
Accumulated Depreciation and Amortization		3,598.1	3,407.6
TOTAL PROPERTY, PLANT AND EQUIPMENT - NET		9,646.5	9,424.4
Other Noncurrent Assets
Regulatory Assets		1,123.0	1,154.2
Securitized Assets		311.0	328.0
Long-term Risk Management Assets		0.2	0.1
Deferred Charges and Other Noncurrent Assets		110.7	113.7
TOTAL OTHER NONCURRENT ASSETS		1,544.9	1,596.0
TOTAL ASSETS		11,768.3	11,648.3
Current Liabilities
Advances from Affiliates		84.1	181.0
Accounts Payable		174.1	196.5
Affiliated Companies		74.8	67.7
Short-term Debt:
Long-term Debt Due Within One Year		503.1	318.0
Risk Management Liabilities		10.7	4.8
Customer Deposits		81.8	83.9
Accrued Taxes		51.8	79.5
Accrued Interest		63.3	40.6
Other Current Liabilities		127.1	153.4
TOTAL CURRENT LIABILITIES		1,170.8	1,125.4
Noncurrent Liabilities
Long-term Debt		3,530.0	3,612.7
Long-term Risk Management Liabilities		0.3	0.1
Deferred Income Taxes		2,632.9	2,527.0
Regulatory Liabilities and Deferred Investment Tax Credits		628.8	637.1
Asset Retirement Obligations		91.2	98.9
Employee Benefits and Pension Obligations		103.0	114.4
Deferred Credits and Other Noncurrent Liabilities		59.1	57.7
TOTAL NONCURRENT LIABILITIES		7,045.3	7,047.9
TOTAL LIABILITIES		8,216.1	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		1,467.5	1,388.7
Accumulated Other Comprehensive Income (Loss)		(4.4)	(2.8)
TOTAL EQUITY		3,552.2	3,475.0
TOTAL LIABILITIES AND EQUITY		11,768.3	11,648.3
Indiana Michigan Power Co [Member]
Current Assets
Cash and Cash Equivalents		1.6	1.1
Advances to Affiliates		12.4	11.7
Accounts Receivable:
Customers		46.3	43.9
Affiliated Companies		47.6	68.7
Accrued Unbilled Revenues		2.2	0.1
Miscellaneous		0.9	2.6
Allowance for Uncollectible Accounts		(0.1)	(0.1)
Total Accounts Receivable		96.9	115.2
Fuel		48.6	46.5
Materials and Supplies		156.2	185.9
Risk Management Assets		5.2	10.6
Risk Management Assets - Affiliated		0.0	1.7
Accrued Tax Benefits		26.5	40.5
Prepayments and Other Current Assets		50.1	42.1
TOTAL CURRENT ASSETS		397.5	455.3
Property, Plant and Equipment
Generation		3,996.3	3,841.7
Transmission		1,437.7	1,406.9
Distribution		1,866.7	1,790.8
Other Property, Plant and Equipment		623.8	662.3
Construction Work in Progress		607.9	519.8
Total Property, Plant and Equipment		8,532.4	8,221.5
Accumulated Depreciation and Amortization		3,063.9	3,018.0
TOTAL PROPERTY, PLANT AND EQUIPMENT - NET		5,468.5	5,203.5
Other Noncurrent Assets
Regulatory Assets		837.6	804.3
Spent Nuclear Fuel and Decommissioning Trusts		2,230.8	2,106.4
Long-term Risk Management Assets		0.2	0.0
Deferred Charges and Other Noncurrent Assets		136.6	140.9
TOTAL OTHER NONCURRENT ASSETS		3,205.2	3,051.6
TOTAL ASSETS		9,071.2	8,710.4
Current Liabilities
Advances from Affiliates		26.3	294.3
Accounts Payable		140.2	201.0
Affiliated Companies		61.9	61.8
Short-term Debt:
Long-term Debt Due Within One Year		176.1	162.9
Risk Management Liabilities		1.3	6.3
Customer Deposits		34.2	35.7
Accrued Taxes		43.7	74.2
Accrued Interest		11.8	26.2
Obligations Under Capital Leases		8.7	32.8
Other Current Liabilities		131.6	142.1
TOTAL CURRENT LIABILITIES		635.8	1,037.3
Noncurrent Liabilities
Long-term Debt		2,231.3	1,837.1
Long-term Risk Management Liabilities		0.2	1.6
Deferred Income Taxes		1,510.9	1,361.5
Regulatory Liabilities and Deferred Investment Tax Credits		1,148.6	1,076.2
Asset Retirement Obligations		1,291.1	1,240.9
Deferred Credits and Other Noncurrent Liabilities		108.3	119.4
TOTAL NONCURRENT LIABILITIES		6,290.4	5,636.7
TOTAL LIABILITIES		6,926.2	6,674.0
Rate Matters
Commitments and Contingencies
Equity
Common Stock		56.6	56.6
Paid-in Capital		980.9	980.9
Retained Earnings		1,123.2	1,015.6
Accumulated Other Comprehensive Income (Loss)		(15.7)	(16.7)
TOTAL EQUITY		2,145.0	2,036.4
TOTAL LIABILITIES AND EQUITY		9,071.2	8,710.4
Ohio Power Co [Member]
Current Assets
Cash and Cash Equivalents		4.0	3.1
Restricted Cash for Securitized Funding		16.1	27.7
Advances to Affiliates		0.2	331.1
Accounts Receivable:
Customers		13.8	46.4
Affiliated Companies		54.1	64.3
Accrued Unbilled Revenues		35.1	1.4
Miscellaneous		0.7	0.4
Allowance for Uncollectible Accounts		(0.2)	(0.2)
Total Accounts Receivable		103.5	112.3
Materials and Supplies		48.8	61.5
Emission Allowances		18.3	24.6
Accrued Tax Benefits		11.5	1.8
Prepayments and Other Current Assets		16.3	11.1
TOTAL CURRENT ASSETS		218.7	573.2
Property, Plant and Equipment
Transmission		2,287.3	2,235.6
Distribution		4,401.7	4,287.7
Other Property, Plant and Equipment		436.7	408.2
Construction Work in Progress		194.1	171.9
Total Property, Plant and Equipment		7,319.8	7,103.4
Accumulated Depreciation and Amortization		2,107.1	2,048.7
TOTAL PROPERTY, PLANT AND EQUIPMENT - NET		5,212.7	5,054.7
Other Noncurrent Assets
Notes Receivable - Affiliated		32.3	32.3
Regulatory Assets		1,016.4	1,113.0
Securitized Assets		68.0	85.9
Long-term Risk Management Assets		0.0	19.2
Deferred Charges and Other Noncurrent Assets		116.0	259.6
TOTAL OTHER NONCURRENT ASSETS		1,232.7	1,510.0
TOTAL ASSETS		6,664.1	7,137.9
Current Liabilities
Accounts Payable		152.9	156.4
Affiliated Companies		90.9	88.7
Short-term Debt:
Long-term Debt Due Within One Year		46.4	395.9
Risk Management Liabilities		5.6	3.6
Customer Deposits		71.2	65.4
Accrued Taxes		246.6	528.3
Accrued Interest		38.4	33.0
Other Current Liabilities		87.0	154.3
TOTAL CURRENT LIABILITIES		739.0	1,425.6
Noncurrent Liabilities
Long-term Debt		1,717.0	1,761.8
Long-term Risk Management Liabilities		103.5	0.0
Deferred Income Taxes		1,414.0	1,383.2
Regulatory Liabilities and Deferred Investment Tax Credits		555.7	514.2
Employee Benefits and Pension Obligations		27.7	35.8
Deferred Credits and Other Noncurrent Liabilities		26.9	30.7
TOTAL NONCURRENT LIABILITIES		3,844.8	3,725.7
TOTAL LIABILITIES		4,583.8	5,151.3
Rate Matters
Commitments and Contingencies
Equity
Common Stock		321.2	321.2
Paid-in Capital		838.8	838.8
Retained Earnings		917.0	822.3
Accumulated Other Comprehensive Income (Loss)		3.3	4.3
TOTAL EQUITY		2,080.3	1,986.6
TOTAL LIABILITIES AND EQUITY		6,664.1	7,137.9
Public Service Co Of Oklahoma [Member]
Current Assets
Cash and Cash Equivalents		2.0	1.4
Advances to Affiliates		51.1	80.6
Accounts Receivable:
Customers		17.8	26.0
Affiliated Companies		23.5	20.8
Miscellaneous		4.4	3.3
Allowance for Uncollectible Accounts		(0.6)	(0.6)
Total Accounts Receivable		45.1	49.5
Fuel		21.8	17.6
Materials and Supplies		50.1	51.9
Risk Management Assets		1.1	0.6
Accrued Tax Benefits		7.6	37.3
Regulatory Asset for Under-Recovered Fuel Costs		4.1	0.0
Prepayments and Other Current Assets		10.8	6.5
TOTAL CURRENT ASSETS		193.7	245.4
Property, Plant and Equipment
Generation		1,552.1	1,302.6
Transmission		832.1	815.4
Distribution		2,284.4	2,206.7
Other Property, Plant and Equipment		243.0	405.7
Construction Work in Progress		127.9	315.3
Total Property, Plant and Equipment		5,039.5	5,045.7
Accumulated Depreciation and Amortization		1,297.4	1,352.5
TOTAL PROPERTY, PLANT AND EQUIPMENT - NET		3,742.1	3,693.2
Other Noncurrent Assets
Regulatory Assets		322.2	214.8
Employee Benefits and Pension Assets		15.7	10.6
Deferred Charges and Other Noncurrent Assets		18.1	6.4
TOTAL OTHER NONCURRENT ASSETS		356.0	231.8
TOTAL ASSETS		4,291.8	4,170.4
Current Liabilities
Accounts Payable		116.7	108.2
Affiliated Companies		40.3	51.5
Short-term Debt:
Long-term Debt Due Within One Year		125.5	275.4
Risk Management Liabilities		0.0	0.2
Customer Deposits		50.2	50.3
Accrued Taxes		39.3	23.6
Accrued Interest		14.5	15.1
Regulatory Liability for Over-Recovered Fuel Costs		0.0	76.1
Other Current Liabilities		55.0	64.4
TOTAL CURRENT LIABILITIES		441.5	664.8
Noncurrent Liabilities
Long-term Debt		1,160.7	1,010.7
Deferred Income Taxes		1,055.0	971.8
Regulatory Liabilities and Deferred Investment Tax Credits		340.0	335.1
Asset Retirement Obligations		52.5	39.9
Employee Benefits and Pension Obligations		13.8	14.5
Deferred Credits and Other Noncurrent Liabilities		11.6	13.7
TOTAL NONCURRENT LIABILITIES		2,633.6	2,385.7
TOTAL LIABILITIES		3,075.1	3,050.5
Rate Matters
Commitments and Contingencies
Equity
Common Stock		157.2	157.2
Paid-in Capital		364.0	364.0
Retained Earnings		691.9	594.5
Accumulated Other Comprehensive Income (Loss)		3.6	4.2
TOTAL EQUITY		1,216.7	1,119.9
TOTAL LIABILITIES AND EQUITY		4,291.8	4,170.4
Southwestern Electric Power Co [Member]
Current Assets
Cash and Cash Equivalents		15.2	5.2
Advances to Affiliates		299.4	2.0
Accounts Receivable:
Customers		25.0	40.2
Affiliated Companies		30.4	22.0
Miscellaneous		22.4	27.1
Allowance for Uncollectible Accounts		(1.6)	(0.9)
Total Accounts Receivable		76.2	88.4
Fuel		109.4	142.1
Materials and Supplies		70.8	71.5
Risk Management Assets		1.4	0.8
Regulatory Asset for Under-Recovered Fuel Costs		0.8	4.1
Prepayments and Other Current Assets		21.0	21.2
TOTAL CURRENT ASSETS		594.2	335.3
Property, Plant and Equipment
Generation		4,581.9	3,943.5
Transmission		1,487.6	1,387.8
Distribution		1,994.5	1,957.3
Other Property, Plant and Equipment		707.1	883.5
Construction Work in Progress		188.5	751.3
Total Property, Plant and Equipment		8,959.6	8,923.4
Accumulated Depreciation and Amortization		2,572.4	2,602.3
TOTAL PROPERTY, PLANT AND EQUIPMENT - NET		6,387.2	6,321.1
Other Noncurrent Assets
Regulatory Assets		500.7	415.8
Deferred Charges and Other Noncurrent Assets		116.2	75.8
TOTAL OTHER NONCURRENT ASSETS		616.9	491.6
TOTAL ASSETS		7,598.3	7,148.0
Current Liabilities
Advances from Affiliates		0.0	58.3
Accounts Payable		129.3	150.4
Affiliated Companies		51.6	78.8
Short-term Debt:
Long-term Debt Due Within One Year		354.0	3.3
Risk Management Liabilities		0.0	3.1
Customer Deposits		61.8	61.4
Accrued Taxes		74.0	58.3
Accrued Interest		23.0	43.0
Obligations Under Capital Leases		16.8	21.9
Other Current Liabilities		81.0	110.7
TOTAL CURRENT LIABILITIES		791.5	589.2
Noncurrent Liabilities
Long-term Debt		2,320.0	2,270.2
Long-term Risk Management Liabilities		0.0	2.1
Deferred Income Taxes		1,562.1	1,399.8
Regulatory Liabilities and Deferred Investment Tax Credits		446.9	448.8
Asset Retirement Obligations		127.4	117.5
Employee Benefits and Pension Obligations		26.6	25.8
Obligations Under Capital Leases		68.5	75.6
Deferred Credits and Other Noncurrent Liabilities		25.1	49.3
TOTAL NONCURRENT LIABILITIES		4,576.6	4,389.1
TOTAL LIABILITIES		5,368.1	4,978.3
Rate Matters
Commitments and Contingencies
Equity
Common Stock		135.7	135.7
Paid-in Capital		676.6	676.6
Retained Earnings		1,426.2	1,366.3
Accumulated Other Comprehensive Income (Loss)		(8.6)	(9.4)
TOTAL COMMON SHAREHOLDER'S EQUITY		2,229.9	2,169.2
Noncontrolling Interests		0.3	0.5
TOTAL EQUITY		2,230.2	2,169.7
TOTAL LIABILITIES AND EQUITY		$ 7,598.3	$ 7,148.0

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