Comprehensive Income (Details) (USD $)	3 Months Ended				6 Months Ended
	Jun. 30, 2013		Jun. 30, 2012		Jun. 30, 2013		Jun. 30, 2012
Changes in Accumulated Other Comprehensive Income (Loss) by Component
Beginning Balance in AOCI	$ (306,000,000)				$ (337,000,000)
Change in Fair Value Recognized in AOCI	(9,000,000)				13,000,000
Amounts Reclassified from AOCI	2,000,000				11,000,000
Net Current Period Other Comprehensive Income	(7,000,000)		(3,000,000)		24,000,000		(5,000,000)
Ending Balance in AOCI	(313,000,000)				(313,000,000)
Interest Rate and Foreign Currency:
Reclassifications from AOCI, Net of Income Tax (Expense) Credit	(194,000)
Amortization of Pension and OPEB
Total Reclassifications from AOCI, Net of Income Tax (Expense) Credit	2,000,000				11,000,000
Total Accumulated Other Comprehensive Income (Loss) Activity for Cash Flow Hedges
Beginning Balance in AOCI					(38,000,000)
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income/within Balance Sheet:
Ending Balance in AOCI	(24,000,000)				(24,000,000)
Cash Flow Hedges [Member]
Commodity:
Commodity	(2,000,000)				3,000,000
Interest Rate and Foreign Currency:
Reclassifications from AOCI, before Income Tax (Expense) Credit	(2,000,000)				3,000,000
Income Tax (Expense) Credit	(1,000,000)				1,000,000
Reclassifications from AOCI, Net of Income Tax (Expense) Credit	(1,000,000)				2,000,000
Total Accumulated Other Comprehensive Income (Loss) Activity for Cash Flow Hedges
Beginning Balance in AOCI			(34,000,000)				(23,000,000)
Changes in Fair Value Recognized in AOCI			(16,000,000)				(35,000,000)
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income/within Balance Sheet:
Ending Balance in AOCI			(44,000,000)				(44,000,000)
Utility Operations Revenues [Member] | Cash Flow Hedges [Member]
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income/within Balance Sheet:
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income			0				0
Other Revenues [Member] | Cash Flow Hedges [Member]
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income/within Balance Sheet:
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income			(2,000,000)				(3,000,000)
Purchased Electricity for Resale [Member] | Cash Flow Hedges [Member]
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income/within Balance Sheet:
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income			6,000,000				13,000,000
Interest Expense [Member] | Cash Flow Hedges [Member]
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income/within Balance Sheet:
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income			1,000,000				2,000,000
Regulatory Assets [Member] | Cash Flow Hedges [Member]
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income/within Balance Sheet:
Amount of (Gain) or Loss Reclassified from AOCI within Balance Sheet			1,000,000	[1]			2,000,000	[1]
Commodity [Member] | Cash Flow Hedges [Member]
Changes in Accumulated Other Comprehensive Income (Loss) by Component
Beginning Balance in AOCI	12,000,000				(8,000,000)
Change in Fair Value Recognized in AOCI	(8,000,000)				10,000,000
Amounts Reclassified from AOCI	(3,000,000)				(1,000,000)
Net Current Period Other Comprehensive Income	(11,000,000)				9,000,000
Ending Balance in AOCI	1,000,000				1,000,000
Commodity:
Commodity	(4,000,000)				(1,000,000)
Interest Rate and Foreign Currency:
Reclassifications from AOCI, before Income Tax (Expense) Credit	(4,000,000)				(1,000,000)
Amortization of Pension and OPEB
Total Reclassifications from AOCI, Net of Income Tax (Expense) Credit	(3,000,000)				(1,000,000)
Total Accumulated Other Comprehensive Income (Loss) Activity for Cash Flow Hedges
Beginning Balance in AOCI			(16,000,000)				(3,000,000)
Changes in Fair Value Recognized in AOCI			(3,000,000)				(23,000,000)
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income/within Balance Sheet:
Ending Balance in AOCI			(14,000,000)				(14,000,000)
Commodity [Member] | Utility Operations Revenues [Member] | Cash Flow Hedges [Member]
Commodity:
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income	0				0
Interest Rate and Foreign Currency:
Interest Rate and Foreign Currency	0				0
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income/within Balance Sheet:
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income			0				0
Commodity [Member] | Other Revenues [Member] | Cash Flow Hedges [Member]
Commodity:
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income	(2,000,000)				(5,000,000)
Interest Rate and Foreign Currency:
Interest Rate and Foreign Currency	(2,000,000)				(5,000,000)
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income/within Balance Sheet:
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income			(2,000,000)				(3,000,000)
Commodity [Member] | Purchased Electricity for Resale [Member] | Cash Flow Hedges [Member]
Commodity:
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income	(2,000,000)				4,000,000
Interest Rate and Foreign Currency:
Interest Rate and Foreign Currency	(2,000,000)				4,000,000
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income/within Balance Sheet:
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income			6,000,000				13,000,000
Commodity [Member] | Property Plant and Equipment [Member] | Cash Flow Hedges [Member]
Commodity:
Amount of (Gain) or Loss Reclassified from AOCI within Balance Sheet	0				0
Commodity [Member] | Interest Expense [Member] | Cash Flow Hedges [Member]
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income/within Balance Sheet:
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income			0				0
Commodity [Member] | Regulatory Assets [Member] | Cash Flow Hedges [Member]
Commodity:
Amount of (Gain) or Loss Reclassified from AOCI within Balance Sheet	0	[1]			0	[1]
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income/within Balance Sheet:
Amount of (Gain) or Loss Reclassified from AOCI within Balance Sheet			1,000,000	[1]			2,000,000	[1]
Interest Rate and Foreign Currency [Member] | Cash Flow Hedges [Member]
Changes in Accumulated Other Comprehensive Income (Loss) by Component
Beginning Balance in AOCI	(26,000,000)				(30,000,000)
Change in Fair Value Recognized in AOCI	(1,000,000)				2,000,000
Amounts Reclassified from AOCI	2,000,000				3,000,000
Net Current Period Other Comprehensive Income	1,000,000				5,000,000
Ending Balance in AOCI	(25,000,000)				(25,000,000)
Commodity:
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income	2,000,000				4,000,000
Interest Rate and Foreign Currency:
Interest Rate and Foreign Currency	2,000,000				4,000,000
Amortization of Pension and OPEB
Total Reclassifications from AOCI, Net of Income Tax (Expense) Credit	2,000,000				3,000,000
Total Accumulated Other Comprehensive Income (Loss) Activity for Cash Flow Hedges
Beginning Balance in AOCI			(18,000,000)				(20,000,000)
Changes in Fair Value Recognized in AOCI			(13,000,000)				(12,000,000)
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income/within Balance Sheet:
Ending Balance in AOCI			(30,000,000)				(30,000,000)
Interest Rate and Foreign Currency [Member] | Utility Operations Revenues [Member] | Cash Flow Hedges [Member]
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income/within Balance Sheet:
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income			0				0
Interest Rate and Foreign Currency [Member] | Other Revenues [Member] | Cash Flow Hedges [Member]
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income/within Balance Sheet:
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income			0				0
Interest Rate and Foreign Currency [Member] | Purchased Electricity for Resale [Member] | Cash Flow Hedges [Member]
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income/within Balance Sheet:
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income			0				0
Interest Rate and Foreign Currency [Member] | Interest Expense [Member] | Cash Flow Hedges [Member]
Commodity:
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income	2,000,000				4,000,000
Interest Rate and Foreign Currency:
Interest Rate and Foreign Currency	2,000,000				4,000,000
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income/within Balance Sheet:
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income			1,000,000				2,000,000
Interest Rate and Foreign Currency [Member] | Regulatory Assets [Member] | Cash Flow Hedges [Member]
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income/within Balance Sheet:
Amount of (Gain) or Loss Reclassified from AOCI within Balance Sheet			0	[1]			0	[1]
Securities Available for Sale [Member]
Changes in Accumulated Other Comprehensive Income (Loss) by Component
Beginning Balance in AOCI	5,000,000				4,000,000
Change in Fair Value Recognized in AOCI	0				1,000,000
Amounts Reclassified from AOCI	0				0
Net Current Period Other Comprehensive Income	0				1,000,000
Ending Balance in AOCI	5,000,000				5,000,000
Gains and Losses on Available-for-Sale Securities
Reclassifications from AOCI, before Income Tax (Expense) Credit	0				0
Income Tax (Expense) Credit	0				0
Reclassifications from AOCI, Net of Income Tax (Expense) Credit	0				0
Amortization of Pension and OPEB
Total Reclassifications from AOCI, Net of Income Tax (Expense) Credit	0				0
Total Accumulated Other Comprehensive Income (Loss) Activity For Other Temporary Investments
Beginning Balance in AOCI			4,000,000				2,000,000
Changes in Fair Value Recognized in AOCI			(1,000,000)				1,000,000
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income	0				0
Ending Balance in AOCI			3,000,000				3,000,000
Securities Available for Sale [Member] | Interest Expense [Member]
Gains and Losses on Available-for-Sale Securities
Reclassifications from AOCI, before Income Tax (Expense) Credit	0				0
Securities Available for Sale [Member] | Interest Income [Member]
Gains and Losses on Available-for-Sale Securities
Reclassifications from AOCI, before Income Tax (Expense) Credit	0				0
Reclassifications from AOCI, Net of Income Tax (Expense) Credit			0				0
Total Accumulated Other Comprehensive Income (Loss) Activity For Other Temporary Investments
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income			0				0
Pension and OPEB [Member]
Changes in Accumulated Other Comprehensive Income (Loss) by Component
Beginning Balance in AOCI	(297,000,000)				(303,000,000)
Change in Fair Value Recognized in AOCI	0				0
Amounts Reclassified from AOCI	3,000,000				9,000,000
Net Current Period Other Comprehensive Income	3,000,000				9,000,000
Ending Balance in AOCI	(294,000,000)				(294,000,000)
Amortization of Pension and OPEB
Reclassifications from AOCI, before Income Tax (Expense) Credit	5,000,000				14,000,000
Income Tax (Expense) Credit	2,000,000				5,000,000
Reclassifications from AOCI, Net of Income Tax (Expense) Credit	3,000,000				9,000,000
Total Reclassifications from AOCI, Net of Income Tax (Expense) Credit	3,000,000				9,000,000
Pension and OPEB [Member] | Prior Service Cost (Credit) [Member]
Amortization of Pension and OPEB
Reclassifications from AOCI, before Income Tax (Expense) Credit	(4,000,000)				(9,000,000)
Pension and OPEB [Member] | Actuarial (Gains) Losses [Member]
Amortization of Pension and OPEB
Reclassifications from AOCI, before Income Tax (Expense) Credit	9,000,000				23,000,000
Appalachian Power Co [Member]
Changes in Accumulated Other Comprehensive Income (Loss) by Component
Beginning Balance in AOCI	(28,282,000)				(29,898,000)
Change in Fair Value Recognized in AOCI	(62,000)				731,000
Amounts Reclassified from AOCI	509,000				1,332,000
Net Current Period Other Comprehensive Income	447,000		1,465,000		2,063,000		1,826,000
Ending Balance in AOCI	(27,835,000)				(27,835,000)
Amortization of Pension and OPEB
Total Reclassifications from AOCI, Net of Income Tax (Expense) Credit	509,000				1,332,000
Appalachian Power Co [Member] | Cash Flow Hedges [Member]
Commodity:
Commodity	232,000				947,000
Interest Rate and Foreign Currency:
Reclassifications from AOCI, before Income Tax (Expense) Credit	232,000				947,000
Income Tax (Expense) Credit	81,000				331,000
Reclassifications from AOCI, Net of Income Tax (Expense) Credit	151,000				616,000
Total Accumulated Other Comprehensive Income (Loss) Activity for Cash Flow Hedges
Beginning Balance in AOCI			(824,000)				(285,000)
Changes in Fair Value Recognized in AOCI			(403,000)				(2,248,000)
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income/within Balance Sheet:
Ending Balance in AOCI			(258,000)				(258,000)
Appalachian Power Co [Member] | Electric Generation, Transmission and Distribution Revenues [Member] | Cash Flow Hedges [Member]
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income/within Balance Sheet:
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income			(3,000)				(3,000)
Appalachian Power Co [Member] | Purchased Electricity for Resale [Member] | Cash Flow Hedges [Member]
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income/within Balance Sheet:
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income			157,000				376,000
Appalachian Power Co [Member] | Other Operation Expense [Member] | Cash Flow Hedges [Member]
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income/within Balance Sheet:
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income			(14,000)				(16,000)
Appalachian Power Co [Member] | Maintenance Expense [Member] | Cash Flow Hedges [Member]
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income/within Balance Sheet:
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income			(6,000)				(9,000)
Appalachian Power Co [Member] | Depreciation and Amortization Expense [Member] | Cash Flow Hedges [Member]
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income/within Balance Sheet:
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income			0				0
Appalachian Power Co [Member] | Property Plant and Equipment [Member] | Cash Flow Hedges [Member]
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income/within Balance Sheet:
Amount of (Gain) or Loss Reclassified from AOCI within Balance Sheet			(10,000)				(12,000)
Appalachian Power Co [Member] | Interest Expense [Member] | Cash Flow Hedges [Member]
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income/within Balance Sheet:
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income			269,000				538,000
Appalachian Power Co [Member] | Regulatory Assets [Member] | Cash Flow Hedges [Member]
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income/within Balance Sheet:
Amount of (Gain) or Loss Reclassified from AOCI within Balance Sheet			576,000	[1]			1,401,000	[1]
Appalachian Power Co [Member] | Commodity [Member] | Cash Flow Hedges [Member]
Changes in Accumulated Other Comprehensive Income (Loss) by Component
Beginning Balance in AOCI	361,000				(644,000)
Change in Fair Value Recognized in AOCI	(63,000)				731,000
Amounts Reclassified from AOCI	(101,000)				110,000
Net Current Period Other Comprehensive Income	(164,000)				841,000
Ending Balance in AOCI	197,000				197,000
Commodity:
Commodity	(157,000)				168,000
Interest Rate and Foreign Currency:
Reclassifications from AOCI, before Income Tax (Expense) Credit	(157,000)				168,000
Amortization of Pension and OPEB
Total Reclassifications from AOCI, Net of Income Tax (Expense) Credit	(101,000)				110,000
Total Accumulated Other Comprehensive Income (Loss) Activity for Cash Flow Hedges
Beginning Balance in AOCI			(2,117,000)				(1,309,000)
Changes in Fair Value Recognized in AOCI			(403,000)				(2,248,000)
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income/within Balance Sheet:
Ending Balance in AOCI			(1,820,000)				(1,820,000)
Appalachian Power Co [Member] | Commodity [Member] | Electric Generation, Transmission and Distribution Revenues [Member] | Cash Flow Hedges [Member]
Commodity:
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income	2,000				22,000
Interest Rate and Foreign Currency:
Interest Rate and Foreign Currency	2,000				22,000
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income/within Balance Sheet:
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income			(3,000)				(3,000)
Appalachian Power Co [Member] | Commodity [Member] | Purchased Electricity for Resale [Member] | Cash Flow Hedges [Member]
Commodity:
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income	(31,000)				26,000
Interest Rate and Foreign Currency:
Interest Rate and Foreign Currency	(31,000)				26,000
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income/within Balance Sheet:
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income			157,000				376,000
Appalachian Power Co [Member] | Commodity [Member] | Other Operation Expense [Member] | Cash Flow Hedges [Member]
Commodity:
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income	(13,000)				(24,000)
Interest Rate and Foreign Currency:
Interest Rate and Foreign Currency	(13,000)				(24,000)
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income/within Balance Sheet:
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income			(14,000)				(16,000)
Appalachian Power Co [Member] | Commodity [Member] | Maintenance Expense [Member] | Cash Flow Hedges [Member]
Commodity:
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income	(2,000)				(18,000)
Interest Rate and Foreign Currency:
Interest Rate and Foreign Currency	(2,000)				(18,000)
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income/within Balance Sheet:
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income			(6,000)				(9,000)
Appalachian Power Co [Member] | Commodity [Member] | Property Plant and Equipment [Member] | Cash Flow Hedges [Member]
Commodity:
Amount of (Gain) or Loss Reclassified from AOCI within Balance Sheet	(5,000)				(19,000)
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income/within Balance Sheet:
Amount of (Gain) or Loss Reclassified from AOCI within Balance Sheet			(10,000)				(12,000)
Appalachian Power Co [Member] | Commodity [Member] | Regulatory Assets [Member] | Cash Flow Hedges [Member]
Commodity:
Amount of (Gain) or Loss Reclassified from AOCI within Balance Sheet	(108,000)	[1]			181,000	[1]
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income/within Balance Sheet:
Amount of (Gain) or Loss Reclassified from AOCI within Balance Sheet			576,000	[1]			1,401,000	[1]
Appalachian Power Co [Member] | Interest Rate and Foreign Currency [Member] | Cash Flow Hedges [Member]
Changes in Accumulated Other Comprehensive Income (Loss) by Component
Beginning Balance in AOCI	2,330,000				2,077,000
Change in Fair Value Recognized in AOCI	1,000				0
Amounts Reclassified from AOCI	252,000				506,000
Net Current Period Other Comprehensive Income	253,000				506,000
Ending Balance in AOCI	2,583,000				2,583,000
Commodity:
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income	389,000				779,000
Interest Rate and Foreign Currency:
Interest Rate and Foreign Currency	389,000				779,000
Amortization of Pension and OPEB
Total Reclassifications from AOCI, Net of Income Tax (Expense) Credit	252,000				506,000
Total Accumulated Other Comprehensive Income (Loss) Activity for Cash Flow Hedges
Beginning Balance in AOCI			1,293,000				1,024,000
Changes in Fair Value Recognized in AOCI			0				0
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income/within Balance Sheet:
Ending Balance in AOCI			1,562,000				1,562,000
Appalachian Power Co [Member] | Interest Rate and Foreign Currency [Member] | Depreciation and Amortization Expense [Member] | Cash Flow Hedges [Member]
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income/within Balance Sheet:
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income			0				0
Appalachian Power Co [Member] | Interest Rate and Foreign Currency [Member] | Interest Expense [Member] | Cash Flow Hedges [Member]
Commodity:
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income	389,000				779,000
Interest Rate and Foreign Currency:
Interest Rate and Foreign Currency	389,000				779,000
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income/within Balance Sheet:
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income			269,000				538,000
Appalachian Power Co [Member] | Pension and OPEB [Member]
Changes in Accumulated Other Comprehensive Income (Loss) by Component
Beginning Balance in AOCI	(30,973,000)				(31,331,000)
Change in Fair Value Recognized in AOCI	0				0
Amounts Reclassified from AOCI	358,000				716,000
Net Current Period Other Comprehensive Income	358,000				716,000
Ending Balance in AOCI	(30,615,000)				(30,615,000)
Amortization of Pension and OPEB
Reclassifications from AOCI, before Income Tax (Expense) Credit	551,000				1,102,000
Income Tax (Expense) Credit	193,000				386,000
Reclassifications from AOCI, Net of Income Tax (Expense) Credit	358,000				716,000
Total Reclassifications from AOCI, Net of Income Tax (Expense) Credit	358,000				716,000
Appalachian Power Co [Member] | Pension and OPEB [Member] | Prior Service Cost (Credit) [Member]
Amortization of Pension and OPEB
Reclassifications from AOCI, before Income Tax (Expense) Credit	(1,283,000)				(2,565,000)
Appalachian Power Co [Member] | Pension and OPEB [Member] | Actuarial (Gains) Losses [Member]
Amortization of Pension and OPEB
Reclassifications from AOCI, before Income Tax (Expense) Credit	1,834,000				3,667,000
Indiana Michigan Power Co [Member]
Changes in Accumulated Other Comprehensive Income (Loss) by Component
Beginning Balance in AOCI	(25,584,000)				(28,883,000)
Change in Fair Value Recognized in AOCI	(41,000)				2,740,000
Amounts Reclassified from AOCI	537,000				1,055,000
Net Current Period Other Comprehensive Income	496,000		(7,155,000)		3,795,000		(4,420,000)
Ending Balance in AOCI	(25,088,000)				(25,088,000)
Amortization of Pension and OPEB
Total Reclassifications from AOCI, Net of Income Tax (Expense) Credit	537,000				1,055,000
Indiana Michigan Power Co [Member] | Cash Flow Hedges [Member]
Commodity:
Commodity	557,000				1,083,000
Interest Rate and Foreign Currency:
Reclassifications from AOCI, before Income Tax (Expense) Credit	557,000				1,083,000
Income Tax (Expense) Credit	195,000				379,000
Reclassifications from AOCI, Net of Income Tax (Expense) Credit	362,000				704,000
Total Accumulated Other Comprehensive Income (Loss) Activity for Cash Flow Hedges
Beginning Balance in AOCI			(12,828,000)				(15,284,000)
Changes in Fair Value Recognized in AOCI			(8,078,000)				(6,476,000)
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income/within Balance Sheet:
Ending Balance in AOCI			(20,261,000)				(20,261,000)
Indiana Michigan Power Co [Member] | Electric Generation, Transmission and Distribution Revenues [Member] | Cash Flow Hedges [Member]
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income/within Balance Sheet:
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income			(9,000)				(9,000)
Indiana Michigan Power Co [Member] | Purchased Electricity for Resale [Member] | Cash Flow Hedges [Member]
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income/within Balance Sheet:
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income			419,000				986,000
Indiana Michigan Power Co [Member] | Other Operation Expense [Member] | Cash Flow Hedges [Member]
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income/within Balance Sheet:
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income			(8,000)				(10,000)
Indiana Michigan Power Co [Member] | Maintenance Expense [Member] | Cash Flow Hedges [Member]
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income/within Balance Sheet:
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income			(3,000)				(4,000)
Indiana Michigan Power Co [Member] | Depreciation and Amortization Expense [Member] | Cash Flow Hedges [Member]
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income/within Balance Sheet:
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income			0				0
Indiana Michigan Power Co [Member] | Property Plant and Equipment [Member] | Cash Flow Hedges [Member]
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income/within Balance Sheet:
Amount of (Gain) or Loss Reclassified from AOCI within Balance Sheet			(6,000)				(7,000)
Indiana Michigan Power Co [Member] | Interest Expense [Member] | Cash Flow Hedges [Member]
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income/within Balance Sheet:
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income			149,000				298,000
Indiana Michigan Power Co [Member] | Regulatory Assets [Member] | Cash Flow Hedges [Member]
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income/within Balance Sheet:
Amount of (Gain) or Loss Reclassified from AOCI within Balance Sheet			103,000	[1]			245,000	[1]
Indiana Michigan Power Co [Member] | Commodity [Member] | Cash Flow Hedges [Member]
Changes in Accumulated Other Comprehensive Income (Loss) by Component
Beginning Balance in AOCI	236,000				(446,000)
Change in Fair Value Recognized in AOCI	(40,000)				492,000
Amounts Reclassified from AOCI	(49,000)				101,000
Net Current Period Other Comprehensive Income	(89,000)				593,000
Ending Balance in AOCI	147,000				147,000
Commodity:
Commodity	(74,000)				156,000
Interest Rate and Foreign Currency:
Reclassifications from AOCI, before Income Tax (Expense) Credit	(74,000)				156,000
Amortization of Pension and OPEB
Total Reclassifications from AOCI, Net of Income Tax (Expense) Credit	(49,000)				101,000
Total Accumulated Other Comprehensive Income (Loss) Activity for Cash Flow Hedges
Beginning Balance in AOCI			(1,508,000)				(819,000)
Changes in Fair Value Recognized in AOCI			(234,000)				(1,628,000)
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income/within Balance Sheet:
Ending Balance in AOCI			(1,246,000)				(1,246,000)
Indiana Michigan Power Co [Member] | Commodity [Member] | Electric Generation, Transmission and Distribution Revenues [Member] | Cash Flow Hedges [Member]
Commodity:
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income	32,000				84,000
Interest Rate and Foreign Currency:
Interest Rate and Foreign Currency	32,000				84,000
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income/within Balance Sheet:
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income			(9,000)				(9,000)
Indiana Michigan Power Co [Member] | Commodity [Member] | Purchased Electricity for Resale [Member] | Cash Flow Hedges [Member]
Commodity:
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income	(81,000)				68,000
Interest Rate and Foreign Currency:
Interest Rate and Foreign Currency	(81,000)				68,000
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income/within Balance Sheet:
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income			419,000				986,000
Indiana Michigan Power Co [Member] | Commodity [Member] | Other Operation Expense [Member] | Cash Flow Hedges [Member]
Commodity:
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income	(8,000)				(15,000)
Interest Rate and Foreign Currency:
Interest Rate and Foreign Currency	(8,000)				(15,000)
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income/within Balance Sheet:
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income			(8,000)				(10,000)
Indiana Michigan Power Co [Member] | Commodity [Member] | Maintenance Expense [Member] | Cash Flow Hedges [Member]
Commodity:
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income	(2,000)				(9,000)
Interest Rate and Foreign Currency:
Interest Rate and Foreign Currency	(2,000)				(9,000)
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income/within Balance Sheet:
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income			(3,000)				(4,000)
Indiana Michigan Power Co [Member] | Commodity [Member] | Property Plant and Equipment [Member] | Cash Flow Hedges [Member]
Commodity:
Amount of (Gain) or Loss Reclassified from AOCI within Balance Sheet	(3,000)				(10,000)
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income/within Balance Sheet:
Amount of (Gain) or Loss Reclassified from AOCI within Balance Sheet			(6,000)				(7,000)
Indiana Michigan Power Co [Member] | Commodity [Member] | Regulatory Assets [Member] | Cash Flow Hedges [Member]
Commodity:
Amount of (Gain) or Loss Reclassified from AOCI within Balance Sheet	(12,000)	[1]			38,000	[1]
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income/within Balance Sheet:
Amount of (Gain) or Loss Reclassified from AOCI within Balance Sheet			103,000	[1]			245,000	[1]
Indiana Michigan Power Co [Member] | Interest Rate and Foreign Currency [Member] | Cash Flow Hedges [Member]
Changes in Accumulated Other Comprehensive Income (Loss) by Component
Beginning Balance in AOCI	(17,206,000)				(19,647,000)
Change in Fair Value Recognized in AOCI	(1,000)				2,248,000
Amounts Reclassified from AOCI	411,000				603,000
Net Current Period Other Comprehensive Income	410,000				2,851,000
Ending Balance in AOCI	(16,796,000)				(16,796,000)
Commodity:
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income	631,000				927,000
Interest Rate and Foreign Currency:
Interest Rate and Foreign Currency	631,000				927,000
Amortization of Pension and OPEB
Total Reclassifications from AOCI, Net of Income Tax (Expense) Credit	411,000				603,000
Total Accumulated Other Comprehensive Income (Loss) Activity for Cash Flow Hedges
Beginning Balance in AOCI			(11,320,000)				(14,465,000)
Changes in Fair Value Recognized in AOCI			(7,844,000)				(4,848,000)
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income/within Balance Sheet:
Ending Balance in AOCI			(19,015,000)				(19,015,000)
Indiana Michigan Power Co [Member] | Interest Rate and Foreign Currency [Member] | Depreciation and Amortization Expense [Member] | Cash Flow Hedges [Member]
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income/within Balance Sheet:
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income			0				0
Indiana Michigan Power Co [Member] | Interest Rate and Foreign Currency [Member] | Interest Expense [Member] | Cash Flow Hedges [Member]
Commodity:
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income	631,000				927,000
Interest Rate and Foreign Currency:
Interest Rate and Foreign Currency	631,000				927,000
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income/within Balance Sheet:
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income			149,000				298,000
Indiana Michigan Power Co [Member] | Pension and OPEB [Member]
Changes in Accumulated Other Comprehensive Income (Loss) by Component
Beginning Balance in AOCI	(8,614,000)				(8,790,000)
Change in Fair Value Recognized in AOCI	0				0
Amounts Reclassified from AOCI	175,000				351,000
Net Current Period Other Comprehensive Income	175,000				351,000
Ending Balance in AOCI	(8,439,000)				(8,439,000)
Amortization of Pension and OPEB
Reclassifications from AOCI, before Income Tax (Expense) Credit	270,000				540,000
Income Tax (Expense) Credit	95,000				189,000
Reclassifications from AOCI, Net of Income Tax (Expense) Credit	175,000				351,000
Total Reclassifications from AOCI, Net of Income Tax (Expense) Credit	175,000				351,000
Indiana Michigan Power Co [Member] | Pension and OPEB [Member] | Prior Service Cost (Credit) [Member]
Amortization of Pension and OPEB
Reclassifications from AOCI, before Income Tax (Expense) Credit	(198,000)				(397,000)
Indiana Michigan Power Co [Member] | Pension and OPEB [Member] | Actuarial (Gains) Losses [Member]
Amortization of Pension and OPEB
Reclassifications from AOCI, before Income Tax (Expense) Credit	468,000				937,000
Ohio Power Co [Member]
Changes in Accumulated Other Comprehensive Income (Loss) by Component
Beginning Balance in AOCI	(161,390,000)				(165,725,000)
Change in Fair Value Recognized in AOCI	(109,000)				993,000
Amounts Reclassified from AOCI	2,834,000				6,067,000
Net Current Period Other Comprehensive Income	2,725,000		3,410,000		7,060,000		4,910,000
Ending Balance in AOCI	(158,665,000)				(158,665,000)
Amortization of Pension and OPEB
Total Reclassifications from AOCI, Net of Income Tax (Expense) Credit	2,834,000				6,067,000
Ohio Power Co [Member] | Cash Flow Hedges [Member]
Commodity:
Commodity	(671,000)				(726,000)
Interest Rate and Foreign Currency:
Reclassifications from AOCI, before Income Tax (Expense) Credit	(671,000)				(726,000)
Income Tax (Expense) Credit	(235,000)				(254,000)
Reclassifications from AOCI, Net of Income Tax (Expense) Credit	(436,000)				(472,000)
Total Accumulated Other Comprehensive Income (Loss) Activity for Cash Flow Hedges
Beginning Balance in AOCI			5,965,000				7,706,000
Changes in Fair Value Recognized in AOCI			(525,000)				(3,402,000)
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income/within Balance Sheet:
Ending Balance in AOCI			6,135,000				6,135,000
Ohio Power Co [Member] | Electric Generation, Transmission and Distribution Revenues [Member] | Cash Flow Hedges [Member]
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income/within Balance Sheet:
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income			(24,000)				(24,000)
Ohio Power Co [Member] | Purchased Electricity for Resale [Member] | Cash Flow Hedges [Member]
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income/within Balance Sheet:
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income			1,099,000				2,585,000
Ohio Power Co [Member] | Other Operation Expense [Member] | Cash Flow Hedges [Member]
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income/within Balance Sheet:
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income			(19,000)				(24,000)
Ohio Power Co [Member] | Maintenance Expense [Member] | Cash Flow Hedges [Member]
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income/within Balance Sheet:
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income			(8,000)				(10,000)
Ohio Power Co [Member] | Depreciation and Amortization Expense [Member] | Cash Flow Hedges [Member]
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income/within Balance Sheet:
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income			1,000				2,000
Ohio Power Co [Member] | Property Plant and Equipment [Member] | Cash Flow Hedges [Member]
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income/within Balance Sheet:
Amount of (Gain) or Loss Reclassified from AOCI within Balance Sheet			(13,000)				(16,000)
Ohio Power Co [Member] | Interest Expense [Member] | Cash Flow Hedges [Member]
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income/within Balance Sheet:
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income			(341,000)				(682,000)
Ohio Power Co [Member] | Regulatory Assets [Member] | Cash Flow Hedges [Member]
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income/within Balance Sheet:
Amount of (Gain) or Loss Reclassified from AOCI within Balance Sheet			0	[1]			0	[1]
Ohio Power Co [Member] | Commodity [Member] | Cash Flow Hedges [Member]
Changes in Accumulated Other Comprehensive Income (Loss) by Component
Beginning Balance in AOCI	494,000				(912,000)
Change in Fair Value Recognized in AOCI	(109,000)				993,000
Amounts Reclassified from AOCI	(96,000)				208,000
Net Current Period Other Comprehensive Income	(205,000)				1,201,000
Ending Balance in AOCI	289,000				289,000
Commodity:
Commodity	(147,000)				320,000
Interest Rate and Foreign Currency:
Reclassifications from AOCI, before Income Tax (Expense) Credit	(147,000)				320,000
Amortization of Pension and OPEB
Total Reclassifications from AOCI, Net of Income Tax (Expense) Credit	(96,000)				208,000
Total Accumulated Other Comprehensive Income (Loss) Activity for Cash Flow Hedges
Beginning Balance in AOCI			(3,149,000)				(1,748,000)
Changes in Fair Value Recognized in AOCI			(525,000)				(3,402,000)
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income/within Balance Sheet:
Ending Balance in AOCI			(2,639,000)				(2,639,000)
Ohio Power Co [Member] | Commodity [Member] | Electric Generation, Transmission and Distribution Revenues [Member] | Cash Flow Hedges [Member]
Commodity:
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income	81,000				215,000
Interest Rate and Foreign Currency:
Interest Rate and Foreign Currency	81,000				215,000
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income/within Balance Sheet:
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income			(24,000)				(24,000)
Ohio Power Co [Member] | Commodity [Member] | Purchased Electricity for Resale [Member] | Cash Flow Hedges [Member]
Commodity:
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income	(202,000)				180,000
Interest Rate and Foreign Currency:
Interest Rate and Foreign Currency	(202,000)				180,000
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income/within Balance Sheet:
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income			1,099,000				2,585,000
Ohio Power Co [Member] | Commodity [Member] | Other Operation Expense [Member] | Cash Flow Hedges [Member]
Commodity:
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income	(19,000)				(37,000)
Interest Rate and Foreign Currency:
Interest Rate and Foreign Currency	(19,000)				(37,000)
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income/within Balance Sheet:
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income			(19,000)				(24,000)
Ohio Power Co [Member] | Commodity [Member] | Maintenance Expense [Member] | Cash Flow Hedges [Member]
Commodity:
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income	(3,000)				(15,000)
Interest Rate and Foreign Currency:
Interest Rate and Foreign Currency	(3,000)				(15,000)
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income/within Balance Sheet:
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income			(8,000)				(10,000)
Ohio Power Co [Member] | Commodity [Member] | Property Plant and Equipment [Member] | Cash Flow Hedges [Member]
Commodity:
Amount of (Gain) or Loss Reclassified from AOCI within Balance Sheet	(4,000)				(23,000)
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income/within Balance Sheet:
Amount of (Gain) or Loss Reclassified from AOCI within Balance Sheet			(13,000)				(16,000)
Ohio Power Co [Member] | Commodity [Member] | Regulatory Assets [Member] | Cash Flow Hedges [Member]
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income/within Balance Sheet:
Amount of (Gain) or Loss Reclassified from AOCI within Balance Sheet			0	[1]			0	[1]
Ohio Power Co [Member] | Interest Rate and Foreign Currency [Member] | Cash Flow Hedges [Member]
Changes in Accumulated Other Comprehensive Income (Loss) by Component
Beginning Balance in AOCI	7,755,000				8,095,000
Change in Fair Value Recognized in AOCI	0				0
Amounts Reclassified from AOCI	(340,000)				(680,000)
Net Current Period Other Comprehensive Income	(340,000)				(680,000)
Ending Balance in AOCI	7,415,000				7,415,000
Commodity:
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income	(524,000)				(1,046,000)
Interest Rate and Foreign Currency:
Interest Rate and Foreign Currency	(524,000)				(1,046,000)
Amortization of Pension and OPEB
Total Reclassifications from AOCI, Net of Income Tax (Expense) Credit	(340,000)				(680,000)
Total Accumulated Other Comprehensive Income (Loss) Activity for Cash Flow Hedges
Beginning Balance in AOCI			9,114,000				9,454,000
Changes in Fair Value Recognized in AOCI			0				0
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income/within Balance Sheet:
Ending Balance in AOCI			8,774,000				8,774,000
Ohio Power Co [Member] | Interest Rate and Foreign Currency [Member] | Depreciation and Amortization Expense [Member] | Cash Flow Hedges [Member]
Commodity:
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income	1,000				3,000
Interest Rate and Foreign Currency:
Interest Rate and Foreign Currency	1,000				3,000
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income/within Balance Sheet:
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income			1,000				2,000
Ohio Power Co [Member] | Interest Rate and Foreign Currency [Member] | Interest Expense [Member] | Cash Flow Hedges [Member]
Commodity:
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income	(525,000)				(1,049,000)
Interest Rate and Foreign Currency:
Interest Rate and Foreign Currency	(525,000)				(1,049,000)
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income/within Balance Sheet:
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income			(341,000)				(682,000)
Ohio Power Co [Member] | Pension and OPEB [Member]
Changes in Accumulated Other Comprehensive Income (Loss) by Component
Beginning Balance in AOCI	(169,639,000)				(172,908,000)
Change in Fair Value Recognized in AOCI	0				0
Amounts Reclassified from AOCI	3,270,000				6,539,000
Net Current Period Other Comprehensive Income	3,270,000				6,539,000
Ending Balance in AOCI	(166,369,000)				(166,369,000)
Amortization of Pension and OPEB
Reclassifications from AOCI, before Income Tax (Expense) Credit	5,030,000				10,059,000
Income Tax (Expense) Credit	1,760,000				3,520,000
Reclassifications from AOCI, Net of Income Tax (Expense) Credit	3,270,000				6,539,000
Total Reclassifications from AOCI, Net of Income Tax (Expense) Credit	3,270,000				6,539,000
Ohio Power Co [Member] | Pension and OPEB [Member] | Prior Service Cost (Credit) [Member]
Amortization of Pension and OPEB
Reclassifications from AOCI, before Income Tax (Expense) Credit	(1,469,000)				(2,937,000)
Ohio Power Co [Member] | Pension and OPEB [Member] | Actuarial (Gains) Losses [Member]
Amortization of Pension and OPEB
Reclassifications from AOCI, before Income Tax (Expense) Credit	6,499,000				12,996,000
Public Service Co Of Oklahoma [Member]
Changes in Accumulated Other Comprehensive Income (Loss) by Component
Beginning Balance in AOCI	6,314,000				6,481,000
Change in Fair Value Recognized in AOCI	(60,000)				(24,000)
Amounts Reclassified from AOCI	(194,000)				(397,000)
Net Current Period Other Comprehensive Income	(254,000)				(421,000)		(412,000)
Ending Balance in AOCI	6,060,000				6,060,000
Amortization of Pension and OPEB
Total Reclassifications from AOCI, Net of Income Tax (Expense) Credit	(194,000)				(397,000)
Public Service Co Of Oklahoma [Member] | Cash Flow Hedges [Member]
Commodity:
Commodity	(298,000)				(610,000)
Interest Rate and Foreign Currency:
Reclassifications from AOCI, before Income Tax (Expense) Credit	(298,000)				(610,000)
Income Tax (Expense) Credit	(104,000)				(213,000)
Reclassifications from AOCI, Net of Income Tax (Expense) Credit					(397,000)
Total Accumulated Other Comprehensive Income (Loss) Activity for Cash Flow Hedges
Beginning Balance in AOCI			7,096,000				7,149,000
Changes in Fair Value Recognized in AOCI			(155,000)				(16,000)
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income/within Balance Sheet:
Ending Balance in AOCI			6,737,000				6,737,000
Public Service Co Of Oklahoma [Member] | Electric Generation, Transmission and Distribution Revenues [Member] | Cash Flow Hedges [Member]
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income/within Balance Sheet:
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income			0				0
Public Service Co Of Oklahoma [Member] | Purchased Electricity for Resale [Member] | Cash Flow Hedges [Member]
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income/within Balance Sheet:
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income			0				0
Public Service Co Of Oklahoma [Member] | Other Operation Expense [Member] | Cash Flow Hedges [Member]
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income/within Balance Sheet:
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income			(9,000)				(11,000)
Public Service Co Of Oklahoma [Member] | Maintenance Expense [Member] | Cash Flow Hedges [Member]
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income/within Balance Sheet:
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income			(2,000)				(2,000)
Public Service Co Of Oklahoma [Member] | Depreciation and Amortization Expense [Member] | Cash Flow Hedges [Member]
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income/within Balance Sheet:
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income			0				0
Public Service Co Of Oklahoma [Member] | Property Plant and Equipment [Member] | Cash Flow Hedges [Member]
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income/within Balance Sheet:
Amount of (Gain) or Loss Reclassified from AOCI within Balance Sheet			(3,000)				(4,000)
Public Service Co Of Oklahoma [Member] | Interest Expense [Member] | Cash Flow Hedges [Member]
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income/within Balance Sheet:
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income			(190,000)				(379,000)
Public Service Co Of Oklahoma [Member] | Regulatory Assets [Member] | Cash Flow Hedges [Member]
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income/within Balance Sheet:
Amount of (Gain) or Loss Reclassified from AOCI within Balance Sheet			0	[1]			0	[1]
Public Service Co Of Oklahoma [Member] | Commodity [Member] | Cash Flow Hedges [Member]
Changes in Accumulated Other Comprehensive Income (Loss) by Component
Beginning Balance in AOCI	44,000				21,000
Change in Fair Value Recognized in AOCI	(61,000)				(25,000)
Amounts Reclassified from AOCI	(4,000)				(17,000)
Net Current Period Other Comprehensive Income	(65,000)				(42,000)
Ending Balance in AOCI	(21,000)				(21,000)
Commodity:
Commodity	(6,000)				(26,000)
Interest Rate and Foreign Currency:
Reclassifications from AOCI, before Income Tax (Expense) Credit	(6,000)				(26,000)
Amortization of Pension and OPEB
Total Reclassifications from AOCI, Net of Income Tax (Expense) Credit	(4,000)				(17,000)
Total Accumulated Other Comprehensive Income (Loss) Activity for Cash Flow Hedges
Beginning Balance in AOCI			67,000				(69,000)
Changes in Fair Value Recognized in AOCI			(155,000)				(16,000)
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income/within Balance Sheet:
Ending Balance in AOCI			(102,000)				(102,000)
Public Service Co Of Oklahoma [Member] | Commodity [Member] | Electric Generation, Transmission and Distribution Revenues [Member] | Cash Flow Hedges [Member]
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income/within Balance Sheet:
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income			0				0
Public Service Co Of Oklahoma [Member] | Commodity [Member] | Purchased Electricity for Resale [Member] | Cash Flow Hedges [Member]
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income/within Balance Sheet:
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income			0				0
Public Service Co Of Oklahoma [Member] | Commodity [Member] | Other Operation Expense [Member] | Cash Flow Hedges [Member]
Commodity:
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income	(6,000)				(15,000)
Interest Rate and Foreign Currency:
Interest Rate and Foreign Currency	(6,000)				(15,000)
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income/within Balance Sheet:
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income			(9,000)				(11,000)
Public Service Co Of Oklahoma [Member] | Commodity [Member] | Maintenance Expense [Member] | Cash Flow Hedges [Member]
Commodity:
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income	0				(4,000)
Interest Rate and Foreign Currency:
Interest Rate and Foreign Currency	0				(4,000)
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income/within Balance Sheet:
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income			(2,000)				(2,000)
Public Service Co Of Oklahoma [Member] | Commodity [Member] | Property Plant and Equipment [Member] | Cash Flow Hedges [Member]
Commodity:
Amount of (Gain) or Loss Reclassified from AOCI within Balance Sheet	0				(7,000)
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income/within Balance Sheet:
Amount of (Gain) or Loss Reclassified from AOCI within Balance Sheet			(3,000)				(4,000)
Public Service Co Of Oklahoma [Member] | Commodity [Member] | Regulatory Assets [Member] | Cash Flow Hedges [Member]
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income/within Balance Sheet:
Amount of (Gain) or Loss Reclassified from AOCI within Balance Sheet			0	[1]			0	[1]
Public Service Co Of Oklahoma [Member] | Interest Rate and Foreign Currency [Member] | Cash Flow Hedges [Member]
Changes in Accumulated Other Comprehensive Income (Loss) by Component
Beginning Balance in AOCI	6,270,000				6,460,000
Change in Fair Value Recognized in AOCI	1,000				1,000
Amounts Reclassified from AOCI	(190,000)				(380,000)
Net Current Period Other Comprehensive Income	(189,000)				(379,000)
Ending Balance in AOCI	6,081,000				6,081,000
Commodity:
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income	(292,000)				(584,000)
Interest Rate and Foreign Currency:
Interest Rate and Foreign Currency	(292,000)				(584,000)
Amortization of Pension and OPEB
Total Reclassifications from AOCI, Net of Income Tax (Expense) Credit	(190,000)				(380,000)
Total Accumulated Other Comprehensive Income (Loss) Activity for Cash Flow Hedges
Beginning Balance in AOCI			7,029,000				7,218,000
Changes in Fair Value Recognized in AOCI			0				0
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income/within Balance Sheet:
Ending Balance in AOCI			6,839,000				6,839,000
Public Service Co Of Oklahoma [Member] | Interest Rate and Foreign Currency [Member] | Depreciation and Amortization Expense [Member] | Cash Flow Hedges [Member]
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income/within Balance Sheet:
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income			0				0
Public Service Co Of Oklahoma [Member] | Interest Rate and Foreign Currency [Member] | Interest Expense [Member] | Cash Flow Hedges [Member]
Commodity:
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income	(292,000)				(584,000)
Interest Rate and Foreign Currency:
Interest Rate and Foreign Currency	(292,000)				(584,000)
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income/within Balance Sheet:
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income			(190,000)				(379,000)
Southwestern Electric Power Co [Member]
Changes in Accumulated Other Comprehensive Income (Loss) by Component
Beginning Balance in AOCI	(17,327,000)				(17,860,000)
Change in Fair Value Recognized in AOCI	(71,000)				(27,000)
Amounts Reclassified from AOCI	497,000				986,000
Net Current Period Other Comprehensive Income	426,000		563,000		959,000		(1,047,000)
Ending Balance in AOCI	(16,901,000)				(16,901,000)
Amortization of Pension and OPEB
Total Reclassifications from AOCI, Net of Income Tax (Expense) Credit	497,000				986,000
Southwestern Electric Power Co [Member] | Cash Flow Hedges [Member]
Commodity:
Commodity	864,000				1,713,000
Interest Rate and Foreign Currency:
Reclassifications from AOCI, before Income Tax (Expense) Credit	864,000				1,713,000
Income Tax (Expense) Credit	303,000				600,000
Reclassifications from AOCI, Net of Income Tax (Expense) Credit	561,000				1,113,000
Total Accumulated Other Comprehensive Income (Loss) Activity for Cash Flow Hedges
Beginning Balance in AOCI			(17,299,000)				(15,524,000)
Changes in Fair Value Recognized in AOCI			(150,000)				(2,794,000)
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income/within Balance Sheet:
Ending Balance in AOCI			(16,903,000)				(16,903,000)
Southwestern Electric Power Co [Member] | Electric Generation, Transmission and Distribution Revenues [Member] | Cash Flow Hedges [Member]
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income/within Balance Sheet:
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income			0				0
Southwestern Electric Power Co [Member] | Purchased Electricity for Resale [Member] | Cash Flow Hedges [Member]
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income/within Balance Sheet:
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income			0				0
Southwestern Electric Power Co [Member] | Other Operation Expense [Member] | Cash Flow Hedges [Member]
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income/within Balance Sheet:
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income			(7,000)				(9,000)
Southwestern Electric Power Co [Member] | Maintenance Expense [Member] | Cash Flow Hedges [Member]
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income/within Balance Sheet:
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income			(2,000)				(3,000)
Southwestern Electric Power Co [Member] | Depreciation and Amortization Expense [Member] | Cash Flow Hedges [Member]
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income/within Balance Sheet:
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income			0				0
Southwestern Electric Power Co [Member] | Property Plant and Equipment [Member] | Cash Flow Hedges [Member]
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income/within Balance Sheet:
Amount of (Gain) or Loss Reclassified from AOCI within Balance Sheet			(5,000)				(6,000)
Southwestern Electric Power Co [Member] | Interest Expense [Member] | Cash Flow Hedges [Member]
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income/within Balance Sheet:
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income			560,000				1,433,000
Southwestern Electric Power Co [Member] | Regulatory Assets [Member] | Cash Flow Hedges [Member]
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income/within Balance Sheet:
Amount of (Gain) or Loss Reclassified from AOCI within Balance Sheet			0	[1]			0	[1]
Southwestern Electric Power Co [Member] | Commodity [Member] | Cash Flow Hedges [Member]
Changes in Accumulated Other Comprehensive Income (Loss) by Component
Beginning Balance in AOCI	51,000				22,000
Change in Fair Value Recognized in AOCI	(71,000)				(27,000)
Amounts Reclassified from AOCI	(6,000)				(21,000)
Net Current Period Other Comprehensive Income	(77,000)				(48,000)
Ending Balance in AOCI	(26,000)				(26,000)
Commodity:
Commodity	(8,000)				(31,000)
Interest Rate and Foreign Currency:
Reclassifications from AOCI, before Income Tax (Expense) Credit	(8,000)				(31,000)
Amortization of Pension and OPEB
Total Reclassifications from AOCI, Net of Income Tax (Expense) Credit	(6,000)				(21,000)
Total Accumulated Other Comprehensive Income (Loss) Activity for Cash Flow Hedges
Beginning Balance in AOCI			66,000				(62,000)
Changes in Fair Value Recognized in AOCI			(149,000)				(17,000)
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income/within Balance Sheet:
Ending Balance in AOCI			(97,000)				(97,000)
Southwestern Electric Power Co [Member] | Commodity [Member] | Electric Generation, Transmission and Distribution Revenues [Member] | Cash Flow Hedges [Member]
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income/within Balance Sheet:
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income			0				0
Southwestern Electric Power Co [Member] | Commodity [Member] | Purchased Electricity for Resale [Member] | Cash Flow Hedges [Member]
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income/within Balance Sheet:
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income			0				0
Southwestern Electric Power Co [Member] | Commodity [Member] | Other Operation Expense [Member] | Cash Flow Hedges [Member]
Commodity:
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income	(6,000)				(16,000)
Interest Rate and Foreign Currency:
Interest Rate and Foreign Currency	(6,000)				(16,000)
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income/within Balance Sheet:
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income			(7,000)				(9,000)
Southwestern Electric Power Co [Member] | Commodity [Member] | Maintenance Expense [Member] | Cash Flow Hedges [Member]
Commodity:
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income	(1,000)				(7,000)
Interest Rate and Foreign Currency:
Interest Rate and Foreign Currency	(1,000)				(7,000)
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income/within Balance Sheet:
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income			(2,000)				(3,000)
Southwestern Electric Power Co [Member] | Commodity [Member] | Property Plant and Equipment [Member] | Cash Flow Hedges [Member]
Commodity:
Amount of (Gain) or Loss Reclassified from AOCI within Balance Sheet	(1,000)				(8,000)
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income/within Balance Sheet:
Amount of (Gain) or Loss Reclassified from AOCI within Balance Sheet			(5,000)				(6,000)
Southwestern Electric Power Co [Member] | Commodity [Member] | Regulatory Assets [Member] | Cash Flow Hedges [Member]
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income/within Balance Sheet:
Amount of (Gain) or Loss Reclassified from AOCI within Balance Sheet			0	[1]			0	[1]
Southwestern Electric Power Co [Member] | Interest Rate and Foreign Currency [Member] | Cash Flow Hedges [Member]
Changes in Accumulated Other Comprehensive Income (Loss) by Component
Beginning Balance in AOCI	(15,004,000)				(15,571,000)
Change in Fair Value Recognized in AOCI	0				0
Amounts Reclassified from AOCI	567,000				1,134,000
Net Current Period Other Comprehensive Income	567,000				1,134,000
Ending Balance in AOCI	(14,437,000)				(14,437,000)
Commodity:
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income	872,000				1,744,000
Interest Rate and Foreign Currency:
Interest Rate and Foreign Currency	872,000				1,744,000
Amortization of Pension and OPEB
Total Reclassifications from AOCI, Net of Income Tax (Expense) Credit	567,000				1,134,000
Total Accumulated Other Comprehensive Income (Loss) Activity for Cash Flow Hedges
Beginning Balance in AOCI			(17,365,000)				(15,462,000)
Changes in Fair Value Recognized in AOCI			(1,000)				(2,777,000)
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income/within Balance Sheet:
Ending Balance in AOCI			(16,806,000)				(16,806,000)
Southwestern Electric Power Co [Member] | Interest Rate and Foreign Currency [Member] | Depreciation and Amortization Expense [Member] | Cash Flow Hedges [Member]
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income/within Balance Sheet:
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income			0				0
Southwestern Electric Power Co [Member] | Interest Rate and Foreign Currency [Member] | Interest Expense [Member] | Cash Flow Hedges [Member]
Commodity:
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income	872,000				1,744,000
Interest Rate and Foreign Currency:
Interest Rate and Foreign Currency	872,000				1,744,000
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income/within Balance Sheet:
Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income			560,000				1,433,000
Southwestern Electric Power Co [Member] | Pension and OPEB [Member]
Changes in Accumulated Other Comprehensive Income (Loss) by Component
Beginning Balance in AOCI	(2,374,000)				(2,311,000)
Change in Fair Value Recognized in AOCI	0				0
Amounts Reclassified from AOCI	(64,000)				(127,000)
Net Current Period Other Comprehensive Income	(64,000)				(127,000)
Ending Balance in AOCI	(2,438,000)				(2,438,000)
Amortization of Pension and OPEB
Reclassifications from AOCI, before Income Tax (Expense) Credit	(99,000)				(196,000)
Income Tax (Expense) Credit	(35,000)				(69,000)
Reclassifications from AOCI, Net of Income Tax (Expense) Credit	(64,000)				(127,000)
Total Reclassifications from AOCI, Net of Income Tax (Expense) Credit	(64,000)				(127,000)
Southwestern Electric Power Co [Member] | Pension and OPEB [Member] | Prior Service Cost (Credit) [Member]
Amortization of Pension and OPEB
Reclassifications from AOCI, before Income Tax (Expense) Credit	(447,000)				(892,000)
Southwestern Electric Power Co [Member] | Pension and OPEB [Member] | Actuarial (Gains) Losses [Member]
Amortization of Pension and OPEB
Reclassifications from AOCI, before Income Tax (Expense) Credit	$ 348,000				$ 696,000

[1] Represents realized gains and losses subject to regulatory accounting treatment recorded as either current or noncurrent on the condensed balance sheets.