Condensed Consolidated Balance Sheets - USD ($) $ in Millions		Mar. 31, 2017	Dec. 31, 2016
Current Assets
Cash and Cash Equivalents		$ 175.0	$ 210.5
Other Temporary Investments		275.0	331.7
Accounts Receivable:
Customers		601.0	705.1
Accrued Unbilled Revenues		143.6	158.7
Pledged Accounts Receivable - AEP Credit		900.1	972.7
Miscellaneous		104.2	118.1
Allowance for Uncollectible Accounts		(37.7)	(37.9)
Total Accounts Receivable		1,711.2	1,916.7
Fuel		408.0	423.8
Materials and Supplies		547.3	543.5
Risk Management Assets		85.0	94.5
Regulatory Asset for Under-Recovered Fuel Costs		158.5	156.6
Margin Deposits		105.7	79.9
Assets Held for Sale		9.7	1,951.2
Prepayments and Other Current Assets		141.0	325.5
TOTAL CURRENT ASSETS		3,616.4	6,033.9
Property, Plant and Equipment
Generation		20,290.3	19,848.9
Transmission		16,874.8	16,658.7
Distribution		19,136.6	18,900.8
Other Property, Plant and Equipment		3,412.0	3,444.3
Construction Work in Progress		3,196.8	3,183.9
Total Property, Plant and Equipment		62,910.5	62,036.6
Accumulated Depreciation and Amortization		16,674.2	16,397.3
TOTAL PROPERTY, PLANT AND EQUIPMENT - NET		46,236.3	45,639.3
Other Noncurrent Assets
Regulatory Assets		5,583.1	5,625.5
Securitized Assets		1,425.2	1,486.1
Spent Nuclear Fuel and Decommissioning Trusts		2,333.2	2,256.2
Goodwill		52.5	52.5
Long-term Risk Management Assets		310.5	289.1
Deferred Charges and Other Noncurrent Assets		2,171.1	2,085.1
TOTAL OTHER NONCURRENT ASSETS		11,875.6	11,794.5
TOTAL ASSETS		61,728.3	63,467.7
Current Liabilities
Accounts Payable		1,116.9	1,688.5
Short-term Debt:
Securitized Debt for Receivables - AEP Credit	[1]	572.0	673.0
Other Short-term Debt		964.0	1,040.0
Total Short-term Debt		1,536.0	1,713.0
Long-term Debt Due Within One Year		2,514.2	2,878.0
Risk Management Liabilities		68.2	53.4
Customer Deposits		342.0	343.2
Accrued Taxes		1,078.5	1,048.0
Accrued Interest		239.7	227.2
Regulatory Liability for Over-Recovered Fuel Costs		7.5	8.0
Liabilities Held for Sale		3.5	235.9
Other Current Liabilities		1,008.0	1,302.8
TOTAL CURRENT LIABILITIES		7,914.5	9,498.0
Noncurrent Liabilities
Long-term Debt		16,722.2	17,378.4
Long-term Debt - Affiliated		0.0	0.0
Long-term Risk Management Liabilities		344.8	316.2
Deferred Income Taxes		11,981.6	11,884.4
Regulatory Liabilities and Deferred Investment Tax Credits		3,867.6	3,751.3
Asset Retirement Obligations		1,869.8	1,830.6
Employee Benefits and Pension Obligations		586.2	614.1
Deferred Credits and Other Noncurrent Liabilities		728.3	774.6
TOTAL NONCURRENT LIABILITIES		36,100.5	36,549.6
TOTAL LIABILITIES		44,015.0	46,047.6
Rate Matters
Commitments and Contingencies
Contingently Redeemable Performance Share Awards		1.6	0.0
Equity
Common Stock		3,328.3	3,328.3
Paid-in Capital		6,335.5	6,332.6
Retained Earnings		8,194.3	7,892.4
Accumulated Other Comprehensive Income (Loss)		(171.0)	(156.3)
TOTAL COMMON SHAREHOLDER'S EQUITY		17,687.1	17,397.0
Noncontrolling Interests		24.6	23.1
TOTAL EQUITY		17,711.7	17,420.1
TOTAL LIABILITIES AND EQUITY		61,728.3	63,467.7
Appalachian Power Co [Member]
Current Assets
Cash and Cash Equivalents		3.0	2.7
Restricted Cash for Securitized Funding		8.0	15.8
Advances to Affiliates		23.7	24.1
Accounts Receivable:
Customers		125.0	131.4
Affiliated Companies		59.9	54.4
Accrued Unbilled Revenues		52.6	52.7
Miscellaneous		3.9	0.9
Allowance for Uncollectible Accounts		(3.3)	(3.5)
Total Accounts Receivable		238.1	235.9
Fuel		118.7	112.0
Materials and Supplies		99.0	98.8
Risk Management Assets		1.1	2.6
Accrued Tax Benefits		1.7	4.2
Regulatory Asset for Under-Recovered Fuel Costs		67.3	68.4
Margin Deposits		9.6	17.5
Prepayments and Other Current Assets		10.2	9.7
TOTAL CURRENT ASSETS		580.4	591.7
Property, Plant and Equipment
Generation		6,386.4	6,332.8
Transmission		2,809.5	2,796.9
Distribution		3,616.3	3,569.1
Other Property, Plant and Equipment		378.3	373.5
Construction Work in Progress		386.1	390.3
Total Property, Plant and Equipment		13,576.6	13,462.6
Accumulated Depreciation and Amortization		3,705.4	3,636.8
TOTAL PROPERTY, PLANT AND EQUIPMENT - NET		9,871.2	9,825.8
Other Noncurrent Assets
Regulatory Assets		1,111.4	1,121.1
Securitized Assets		299.6	305.3
Long-term Risk Management Assets		0.2	0.0
Deferred Charges and Other Noncurrent Assets		143.1	133.3
TOTAL OTHER NONCURRENT ASSETS		1,554.3	1,559.7
TOTAL ASSETS		12,005.9	11,977.2
Current Liabilities
Advances from Affiliates		182.4	79.6
Accounts Payable		170.9	253.7
Affiliated Companies		77.7	82.6
Short-term Debt:
Long-term Debt Due Within One Year		399.0	503.1
Risk Management Liabilities		6.6	0.3
Customer Deposits		84.3	83.1
Accrued Taxes		118.9	107.6
Accrued Interest		63.1	40.6
Other Current Liabilities		88.9	129.5
TOTAL CURRENT LIABILITIES		1,191.8	1,280.1
Noncurrent Liabilities
Long-term Debt		3,519.8	3,530.8
Long-term Risk Management Liabilities		0.1	0.9
Deferred Income Taxes		2,722.9	2,672.3
Regulatory Liabilities and Deferred Investment Tax Credits		629.4	627.8
Asset Retirement Obligations		107.9	108.8
Employee Benefits and Pension Obligations		103.7	108.5
Deferred Credits and Other Noncurrent Liabilities		66.7	64.5
TOTAL NONCURRENT LIABILITIES		7,150.5	7,113.6
TOTAL LIABILITIES		8,342.3	8,393.7
Rate Matters
Commitments and Contingencies
Equity
Common Stock		260.4	260.4
Paid-in Capital		1,828.7	1,828.7
Retained Earnings		1,583.4	1,502.8
Accumulated Other Comprehensive Income (Loss)		(8.9)	(8.4)
TOTAL EQUITY		3,663.6	3,583.5
TOTAL LIABILITIES AND EQUITY		12,005.9	11,977.2
Indiana Michigan Power Co [Member]
Current Assets
Cash and Cash Equivalents		1.2	1.2
Advances to Affiliates		12.5	12.5
Accounts Receivable:
Customers		47.6	60.2
Affiliated Companies		57.4	51.0
Accrued Unbilled Revenues		4.6	1.5
Miscellaneous		0.8	0.7
Total Accounts Receivable		110.4	113.4
Fuel		38.1	32.3
Materials and Supplies		154.1	150.8
Risk Management Assets		2.4	3.5
Accrued Tax Benefits		56.5	37.7
Regulatory Asset for Under-Recovered Fuel Costs		10.3	26.1
Accrued Reimbursement of Spent Nuclear Fuel Costs		9.1	22.1
Prepayments and Other Current Assets		23.7	19.9
TOTAL CURRENT ASSETS		418.3	419.5
Property, Plant and Equipment
Generation		4,219.6	4,056.1
Transmission		1,472.2	1,472.8
Distribution		1,929.7	1,899.3
Other Property, Plant and Equipment		520.6	550.2
Construction Work in Progress		521.0	654.2
Total Property, Plant and Equipment		8,663.1	8,632.6
Accumulated Depreciation and Amortization		2,984.1	3,005.1
TOTAL PROPERTY, PLANT AND EQUIPMENT - NET		5,679.0	5,627.5
Other Noncurrent Assets
Regulatory Assets		906.1	916.6
Spent Nuclear Fuel and Decommissioning Trusts		2,333.2	2,256.2
Long-term Risk Management Assets		0.6	0.0
Deferred Charges and Other Noncurrent Assets		117.1	121.5
TOTAL OTHER NONCURRENT ASSETS		3,357.0	3,294.3
TOTAL ASSETS		9,454.3	9,341.3
Current Liabilities
Advances from Affiliates		286.8	215.2
Accounts Payable		133.4	179.0
Affiliated Companies		69.2	75.6
Short-term Debt:
Long-term Debt Due Within One Year		199.1	209.3
Risk Management Liabilities		2.8	0.3
Customer Deposits		34.4	34.3
Accrued Taxes		89.1	77.2
Accrued Interest		11.9	31.7
Obligations Under Capital Leases		9.5	9.4
Other Current Liabilities		101.0	123.4
TOTAL CURRENT LIABILITIES		937.2	955.4
Noncurrent Liabilities
Long-term Debt		2,240.4	2,262.1
Long-term Risk Management Liabilities		0.1	0.8
Deferred Income Taxes		1,579.2	1,527.4
Regulatory Liabilities and Deferred Investment Tax Credits		1,120.0	1,065.5
Asset Retirement Obligations		1,271.6	1,257.9
Deferred Credits and Other Noncurrent Liabilities		116.6	120.4
TOTAL NONCURRENT LIABILITIES		6,327.9	6,234.1
TOTAL LIABILITIES		7,265.1	7,189.5
Rate Matters
Commitments and Contingencies
Equity
Common Stock		56.6	56.6
Paid-in Capital		980.9	980.9
Retained Earnings		1,167.6	1,130.5
Accumulated Other Comprehensive Income (Loss)		(15.9)	(16.2)
TOTAL EQUITY		2,189.2	2,151.8
TOTAL LIABILITIES AND EQUITY		9,454.3	9,341.3
Ohio Power Co [Member]
Current Assets
Cash and Cash Equivalents		3.0	3.1
Restricted Cash for Securitized Funding		16.0	27.2
Advances to Affiliates		0.0	24.2
Accounts Receivable:
Customers		41.5	51.1
Affiliated Companies		52.4	66.3
Accrued Unbilled Revenues		14.4	21.0
Miscellaneous		0.8	0.9
Allowance for Uncollectible Accounts		(0.4)	(0.4)
Total Accounts Receivable		108.7	138.9
Materials and Supplies		43.5	45.9
Emission Allowances		22.3	20.4
Risk Management Assets		0.1	0.2
Prepayments and Other Current Assets		12.5	11.0
TOTAL CURRENT ASSETS		206.1	270.9
Property, Plant and Equipment
Transmission		2,326.7	2,319.2
Distribution		4,493.2	4,457.2
Other Property, Plant and Equipment		457.1	443.7
Construction Work in Progress		243.4	221.5
Total Property, Plant and Equipment		7,520.4	7,441.6
Accumulated Depreciation and Amortization		2,140.0	2,116.0
TOTAL PROPERTY, PLANT AND EQUIPMENT - NET		5,380.4	5,325.6
Other Noncurrent Assets
Notes Receivable - Affiliated		32.3	32.3
Regulatory Assets		1,079.8	1,107.5
Securitized Assets		55.9	62.1
Deferred Charges and Other Noncurrent Assets		240.5	295.5
TOTAL OTHER NONCURRENT ASSETS		1,408.5	1,497.4
TOTAL ASSETS		6,995.0	7,093.9
Current Liabilities
Advances from Affiliates		18.3	0.0
Accounts Payable		129.3	175.4
Affiliated Companies		91.4	95.6
Short-term Debt:
Long-term Debt Due Within One Year		46.8	46.4
Risk Management Liabilities		6.3	5.9
Customer Deposits		71.9	71.0
Accrued Taxes		413.5	520.3
Accrued Interest		38.4	31.2
Other Current Liabilities		255.5	236.0
TOTAL CURRENT LIABILITIES		1,071.4	1,181.8
Noncurrent Liabilities
Long-term Debt		1,695.2	1,717.5
Long-term Risk Management Liabilities		118.3	113.1
Deferred Income Taxes		1,382.3	1,346.1
Regulatory Liabilities and Deferred Investment Tax Credits		533.4	506.2
Employee Benefits and Pension Obligations		28.8	27.8
Deferred Credits and Other Noncurrent Liabilities		27.1	83.9
TOTAL NONCURRENT LIABILITIES		3,785.1	3,794.6
TOTAL LIABILITIES		4,856.5	4,976.4
Rate Matters
Commitments and Contingencies
Equity
Common Stock		321.2	321.2
Paid-in Capital		838.8	838.8
Retained Earnings		975.7	954.5
Accumulated Other Comprehensive Income (Loss)		2.8	3.0
TOTAL EQUITY		2,138.5	2,117.5
TOTAL LIABILITIES AND EQUITY		6,995.0	7,093.9
Public Service Co Of Oklahoma [Member]
Current Assets
Cash and Cash Equivalents		1.3	1.5
Accounts Receivable:
Customers		24.8	27.5
Affiliated Companies		16.1	26.8
Miscellaneous		1.3	4.4
Allowance for Uncollectible Accounts		(0.3)	(0.2)
Total Accounts Receivable		41.9	58.5
Fuel		19.1	22.9
Materials and Supplies		45.0	44.6
Risk Management Assets		0.5	0.8
Accrued Tax Benefits		49.3	27.3
Regulatory Asset for Under-Recovered Fuel Costs		46.9	33.8
Prepayments and Other Current Assets		5.8	6.0
TOTAL CURRENT ASSETS		209.8	195.4
Property, Plant and Equipment
Generation		1,566.8	1,559.3
Transmission		842.8	832.8
Distribution		2,364.3	2,322.4
Other Property, Plant and Equipment		268.3	233.2
Construction Work in Progress		106.3	148.2
Total Property, Plant and Equipment		5,148.5	5,095.9
Accumulated Depreciation and Amortization		1,338.3	1,272.7
TOTAL PROPERTY, PLANT AND EQUIPMENT - NET		3,810.2	3,823.2
Other Noncurrent Assets
Regulatory Assets		381.1	340.2
Employee Benefits and Pension Assets		10.5	10.4
Deferred Charges and Other Noncurrent Assets		39.5	10.0
TOTAL OTHER NONCURRENT ASSETS		431.1	360.6
TOTAL ASSETS		4,451.1	4,379.2
Current Liabilities
Advances from Affiliates		163.7	52.0
Accounts Payable		92.5	116.3
Affiliated Companies		42.0	56.2
Short-term Debt:
Long-term Debt Due Within One Year		0.5	0.5
Customer Deposits		50.9	49.7
Accrued Taxes		42.7	21.0
Accrued Interest		14.0	13.9
Provision for Refund		34.7	46.1
Other Current Liabilities		34.3	47.8
TOTAL CURRENT LIABILITIES		475.3	403.5
Noncurrent Liabilities
Long-term Debt		1,285.6	1,285.5
Deferred Income Taxes		1,086.3	1,058.8
Regulatory Liabilities and Deferred Investment Tax Credits		326.5	339.7
Asset Retirement Obligations		53.5	52.8
Employee Benefits and Pension Obligations		12.1	13.6
Deferred Credits and Other Noncurrent Liabilities		10.6	11.2
TOTAL NONCURRENT LIABILITIES		2,774.6	2,761.6
TOTAL LIABILITIES		3,249.9	3,165.1
Rate Matters
Commitments and Contingencies
Equity
Common Stock		157.2	157.2
Paid-in Capital		364.0	364.0
Retained Earnings		676.8	689.5
Accumulated Other Comprehensive Income (Loss)		3.2	3.4
TOTAL EQUITY		1,201.2	1,214.1
TOTAL LIABILITIES AND EQUITY		4,451.1	4,379.2
Southwestern Electric Power Co [Member]
Current Assets
Cash and Cash Equivalents		10.3	10.3
Advances to Affiliates		2.0	169.8
Accounts Receivable:
Customers		36.4	48.5
Affiliated Companies		15.7	29.3
Miscellaneous		19.9	17.5
Allowance for Uncollectible Accounts		(1.0)	(1.2)
Total Accounts Receivable		71.0	94.1
Fuel		94.2	107.1
Materials and Supplies		68.8	68.4
Risk Management Assets		0.6	0.9
Accrued Tax Benefits		83.5	51.5
Regulatory Asset for Under-Recovered Fuel Costs		11.6	8.4
Prepayments and Other Current Assets		38.9	35.5
TOTAL CURRENT ASSETS		380.9	546.0
Property, Plant and Equipment
Generation		4,611.8	4,607.6
Transmission		1,600.2	1,584.2
Distribution		2,039.5	2,020.6
Other Property, Plant and Equipment		677.0	670.4
Construction Work in Progress		125.2	113.8
Total Property, Plant and Equipment		9,053.7	8,996.6
Accumulated Depreciation and Amortization		2,608.0	2,567.1
TOTAL PROPERTY, PLANT AND EQUIPMENT - NET		6,445.7	6,429.5
Other Noncurrent Assets
Regulatory Assets		559.1	551.2
Deferred Charges and Other Noncurrent Assets		147.5	99.9
TOTAL OTHER NONCURRENT ASSETS		706.6	651.1
TOTAL ASSETS		7,533.2	7,626.6
Current Liabilities
Advances from Affiliates		167.9	0.0
Accounts Payable		99.8	117.5
Affiliated Companies		43.2	68.5
Short-term Debt:
Long-term Debt Due Within One Year		485.4	353.7
Risk Management Liabilities		0.4	0.3
Customer Deposits		62.7	62.1
Accrued Taxes		84.7	40.9
Accrued Interest		24.8	45.1
Obligations Under Capital Leases		11.3	11.8
Other Current Liabilities		62.9	83.9
TOTAL CURRENT LIABILITIES		1,043.1	783.8
Noncurrent Liabilities
Long-term Debt		1,942.3	2,325.4
Deferred Income Taxes		1,652.3	1,606.9
Regulatory Liabilities and Deferred Investment Tax Credits		439.1	438.9
Asset Retirement Obligations		148.3	147.1
Employee Benefits and Pension Obligations		29.8	34.1
Obligations Under Capital Leases		64.6	65.5
Deferred Credits and Other Noncurrent Liabilities		9.5	9.7
TOTAL NONCURRENT LIABILITIES		4,285.9	4,627.6
TOTAL LIABILITIES		5,329.0	5,411.4
Rate Matters
Commitments and Contingencies
Equity
Common Stock		135.7	135.7
Paid-in Capital		676.6	676.6
Retained Earnings		1,400.7	1,411.9
Accumulated Other Comprehensive Income (Loss)		(9.1)	(9.4)
TOTAL COMMON SHAREHOLDER'S EQUITY		2,203.9	2,214.8
Noncontrolling Interests		0.3	0.4
TOTAL EQUITY		2,204.2	2,215.2
TOTAL LIABILITIES AND EQUITY		$ 7,533.2	$ 7,626.6

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