Comprehensive Income (Details) (USD $)	3 Months Ended				9 Months Ended
	Sep. 30, 2014		Sep. 30, 2013		Sep. 30, 2014		Sep. 30, 2013
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning Balance in AOCI	$ (104,000,000)		$ (313,000,000)		$ (115,000,000)		$ (337,000,000)
Change in Fair Value Recognized in AOCI	3,000,000		2,000,000		(7,000,000)		15,000,000
Amounts Reclassified from AOCI	(4,000,000)		5,000,000		17,000,000		16,000,000
Net Current Period Other Comprehensive Income	(1,000,000)		7,000,000		10,000,000		31,000,000
Ending Balance in AOCI	(105,000,000)		(306,000,000)		(105,000,000)		(306,000,000)
Commodity:
Vertically Integrated Utilities	2,432,000,000		2,543,000,000		7,217,000,000		7,075,000,000
Generation & Marketing Revenues	169,000,000		135,000,000		457,000,000		346,000,000
Purchased Electricity for Resale	449,000,000		373,000,000		1,560,000,000		1,103,000,000
Other Operation Expense	787,000,000		677,000,000		2,327,000,000		2,079,000,000
Maintenance Expense	321,000,000		261,000,000		953,000,000		839,000,000
Interest Rate and Foreign Currency:
Depreciation and Amortization Expense	507,000,000		447,000,000		1,441,000,000		1,310,000,000
Interest Expense	221,000,000		225,000,000		662,000,000		685,000,000
Income Tax (Expense) Credit	(269,000,000)		(257,000,000)		(791,000,000)		(520,000,000)
Reclassifications from AOCI, Net of Income Tax (Expense) Credit	(4,000,000)		5,000,000		17,000,000		16,000,000
Gains and Losses on Available-for-Sale Securities
Interest Income	1,000,000		3,000,000		5,000,000		55,000,000
Interest Expense	221,000,000		225,000,000		662,000,000		685,000,000
Income Tax (Expense) Credit	(269,000,000)		(257,000,000)		(791,000,000)		(520,000,000)
Reclassifications from AOCI, Net of Income Tax (Expense) Credit	(4,000,000)		5,000,000		17,000,000		16,000,000
Amortization of Pension and OPEB
Income Tax (Expense) Credit	(269,000,000)		(257,000,000)		(791,000,000)		(520,000,000)
Reclassifications from AOCI, Net of Income Tax (Expense) Credit	(4,000,000)		5,000,000		17,000,000		16,000,000
Reclassifications from AOCI, Net of Income Tax (Expense) Credit	(4,000,000)		5,000,000		17,000,000		16,000,000
Cash Flow Hedges [Member]
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Amounts Reclassified from AOCI	(5,000,000)		(2,000,000)		14,000,000		0
Commodity:
Subtotal - Commodity	(7,000,000)		(3,000,000)		23,000,000		0
Interest Rate and Foreign Currency:
Subtotal - Interest Rate and Foreign Currency	(7,000,000)		(3,000,000)		23,000,000		0
Reclassifications from AOCI, before Income Tax (Expense) Credit	(7,000,000)		(3,000,000)		23,000,000		0
Reclassifications from AOCI, Net of Income Tax (Expense) Credit	(5,000,000)		(2,000,000)		14,000,000		0
Gains and Losses on Available-for-Sale Securities
Reclassifications from AOCI, before Income Tax (Expense) Credit	(7,000,000)		(3,000,000)		23,000,000		0
Reclassifications from AOCI, Net of Income Tax (Expense) Credit	(5,000,000)		(2,000,000)		14,000,000		0
Amortization of Pension and OPEB
Reclassifications from AOCI, before Income Tax (Expense) Credit	(7,000,000)		(3,000,000)		23,000,000		0
Reclassifications from AOCI, Net of Income Tax (Expense) Credit	(5,000,000)		(2,000,000)		14,000,000		0
Reclassifications from AOCI, Net of Income Tax (Expense) Credit	(5,000,000)		(2,000,000)		14,000,000		0
Securities Available for Sale [Member]
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning Balance in AOCI	8,000,000		5,000,000		7,000,000		4,000,000
Change in Fair Value Recognized in AOCI	0		1,000,000		1,000,000		2,000,000
Amounts Reclassified from AOCI	0		0		0		0
Net Current Period Other Comprehensive Income	0		1,000,000		1,000,000		2,000,000
Ending Balance in AOCI	8,000,000		6,000,000		8,000,000		6,000,000
Interest Rate and Foreign Currency:
Reclassifications from AOCI, Net of Income Tax (Expense) Credit	0		0		0		0
Gains and Losses on Available-for-Sale Securities
Reclassifications from AOCI, Net of Income Tax (Expense) Credit	0		0		0		0
Amortization of Pension and OPEB
Reclassifications from AOCI, Net of Income Tax (Expense) Credit	0		0		0		0
Reclassifications from AOCI, Net of Income Tax (Expense) Credit	0		0		0		0
Pension and OPEB [Member]
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning Balance in AOCI	(97,000,000)		(294,000,000)		(99,000,000)		(303,000,000)
Change in Fair Value Recognized in AOCI	0		0		0		0
Amounts Reclassified from AOCI	1,000,000		7,000,000		3,000,000		16,000,000
Net Current Period Other Comprehensive Income	1,000,000		7,000,000		3,000,000		16,000,000
Ending Balance in AOCI	(96,000,000)		(287,000,000)		(96,000,000)		(287,000,000)
Commodity:
Subtotal - Commodity	2,000,000		11,000,000		6,000,000		25,000,000
Interest Rate and Foreign Currency:
Subtotal - Interest Rate and Foreign Currency	2,000,000		11,000,000		6,000,000		25,000,000
Reclassifications from AOCI, before Income Tax (Expense) Credit	2,000,000		11,000,000		6,000,000		25,000,000
Reclassifications from AOCI, Net of Income Tax (Expense) Credit	1,000,000		7,000,000		3,000,000		16,000,000
Gains and Losses on Available-for-Sale Securities
Reclassifications from AOCI, before Income Tax (Expense) Credit	2,000,000		11,000,000		6,000,000		25,000,000
Reclassifications from AOCI, Net of Income Tax (Expense) Credit	1,000,000		7,000,000		3,000,000		16,000,000
Amortization of Pension and OPEB
Prior Service Cost (Credit)	(5,000,000)		(7,000,000)		(15,000,000)		(16,000,000)
Actuarial (Gains)/Losses	7,000,000		18,000,000		21,000,000		41,000,000
Reclassifications from AOCI, before Income Tax (Expense) Credit	2,000,000		11,000,000		6,000,000		25,000,000
Reclassifications from AOCI, Net of Income Tax (Expense) Credit	1,000,000		7,000,000		3,000,000		16,000,000
Reclassifications from AOCI, Net of Income Tax (Expense) Credit	1,000,000		7,000,000		3,000,000		16,000,000
Commodity [Member] | Cash Flow Hedges [Member]
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning Balance in AOCI	6,000,000		1,000,000		0		(8,000,000)
Change in Fair Value Recognized in AOCI	3,000,000		1,000,000		(8,000,000)		11,000,000
Amounts Reclassified from AOCI	(6,000,000)		(3,000,000)		11,000,000		(4,000,000)
Net Current Period Other Comprehensive Income	(3,000,000)		(2,000,000)		3,000,000		7,000,000
Ending Balance in AOCI	3,000,000		(1,000,000)		3,000,000		(1,000,000)
Commodity:
Subtotal - Commodity	(9,000,000)		(5,000,000)		17,000,000		(6,000,000)
Interest Rate and Foreign Currency:
Subtotal - Interest Rate and Foreign Currency	(9,000,000)		(5,000,000)		17,000,000		(6,000,000)
Reclassifications from AOCI, before Income Tax (Expense) Credit	(9,000,000)		(5,000,000)		17,000,000		(6,000,000)
Reclassifications from AOCI, Net of Income Tax (Expense) Credit	(6,000,000)		(3,000,000)		11,000,000		(4,000,000)
Gains and Losses on Available-for-Sale Securities
Reclassifications from AOCI, before Income Tax (Expense) Credit	(9,000,000)		(5,000,000)		17,000,000		(6,000,000)
Reclassifications from AOCI, Net of Income Tax (Expense) Credit	(6,000,000)		(3,000,000)		11,000,000		(4,000,000)
Amortization of Pension and OPEB
Reclassifications from AOCI, before Income Tax (Expense) Credit	(9,000,000)		(5,000,000)		17,000,000		(6,000,000)
Reclassifications from AOCI, Net of Income Tax (Expense) Credit	(6,000,000)		(3,000,000)		11,000,000		(4,000,000)
Reclassifications from AOCI, Net of Income Tax (Expense) Credit	(6,000,000)		(3,000,000)		11,000,000		(4,000,000)
Interest Rate and Foreign Currency [Member] | Cash Flow Hedges [Member]
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning Balance in AOCI	(21,000,000)		(25,000,000)		(23,000,000)		(30,000,000)
Change in Fair Value Recognized in AOCI	0		0		0		2,000,000
Amounts Reclassified from AOCI	1,000,000		1,000,000		3,000,000		4,000,000
Net Current Period Other Comprehensive Income	1,000,000		1,000,000		3,000,000		6,000,000
Ending Balance in AOCI	(20,000,000)		(24,000,000)		(20,000,000)		(24,000,000)
Commodity:
Subtotal - Commodity	2,000,000		2,000,000		6,000,000		6,000,000
Interest Rate and Foreign Currency:
Subtotal - Interest Rate and Foreign Currency	2,000,000		2,000,000		6,000,000		6,000,000
Reclassifications from AOCI, before Income Tax (Expense) Credit	2,000,000		2,000,000		6,000,000		6,000,000
Reclassifications from AOCI, Net of Income Tax (Expense) Credit	1,000,000		1,000,000		3,000,000		4,000,000
Gains and Losses on Available-for-Sale Securities
Reclassifications from AOCI, before Income Tax (Expense) Credit	2,000,000		2,000,000		6,000,000		6,000,000
Reclassifications from AOCI, Net of Income Tax (Expense) Credit	1,000,000		1,000,000		3,000,000		4,000,000
Amortization of Pension and OPEB
Reclassifications from AOCI, before Income Tax (Expense) Credit	2,000,000		2,000,000		6,000,000		6,000,000
Reclassifications from AOCI, Net of Income Tax (Expense) Credit	1,000,000		1,000,000		3,000,000		4,000,000
Reclassifications from AOCI, Net of Income Tax (Expense) Credit	1,000,000		1,000,000		3,000,000		4,000,000
Reclassifications from Accumulated Other Comprehensive Income [Member] | Cash Flow Hedges [Member]
Interest Rate and Foreign Currency:
Income Tax (Expense) Credit	(2,000,000)		(1,000,000)		9,000,000		0
Gains and Losses on Available-for-Sale Securities
Income Tax (Expense) Credit	(2,000,000)		(1,000,000)		9,000,000		0
Amortization of Pension and OPEB
Income Tax (Expense) Credit	(2,000,000)		(1,000,000)		9,000,000		0
Reclassifications from Accumulated Other Comprehensive Income [Member] | Pension and OPEB [Member]
Interest Rate and Foreign Currency:
Income Tax (Expense) Credit	1,000,000		4,000,000		3,000,000		9,000,000
Gains and Losses on Available-for-Sale Securities
Income Tax (Expense) Credit	1,000,000		4,000,000		3,000,000		9,000,000
Amortization of Pension and OPEB
Income Tax (Expense) Credit	1,000,000		4,000,000		3,000,000		9,000,000
Reclassifications from Accumulated Other Comprehensive Income [Member] | Commodity [Member] | Cash Flow Hedges [Member]
Commodity:
Vertically Integrated Utilities	0		(1,000,000)		0		(1,000,000)
Generation & Marketing Revenues	0		(3,000,000)		0		(8,000,000)
Purchased Electricity for Resale	(9,000,000)		(1,000,000)		20,000,000		3,000,000
Regulatory Assets/(Liabilities), Net					(3,000,000)	[1]	0	[1]
Reclassifications from Accumulated Other Comprehensive Income [Member] | Interest Rate and Foreign Currency [Member] | Cash Flow Hedges [Member]
Interest Rate and Foreign Currency:
Interest Expense	2,000,000		2,000,000		6,000,000		6,000,000
Gains and Losses on Available-for-Sale Securities
Interest Expense	2,000,000		2,000,000		6,000,000		6,000,000
Appalachian Power Co [Member]
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning Balance in AOCI	2,697,000		(27,835,000)		2,951,000		(29,898,000)
Change in Fair Value Recognized in AOCI	0		(47,000)		1,686,000		684,000
Amounts Reclassified from AOCI	(163,000)		428,000		(2,103,000)		1,760,000
Net Current Period Other Comprehensive Income	(163,000)		381,000		(417,000)		2,444,000
Ending Balance in AOCI	2,534,000		(27,454,000)		2,534,000		(27,454,000)
Commodity:
Vertically Integrated Utilities	672,459,000		756,606,000		2,202,967,000		2,299,587,000
Generation & Marketing Revenues	1,970,000		2,569,000		6,537,000		6,833,000
Purchased Electricity for Resale	85,656,000		47,391,000		340,680,000		172,334,000
Other Operation Expense	103,835,000		64,508,000		297,269,000		223,180,000
Maintenance Expense	64,333,000		49,924,000		193,907,000		207,870,000
Interest Rate and Foreign Currency:
Depreciation and Amortization Expense	99,889,000		84,513,000		300,125,000		255,656,000
Interest Expense	52,738,000		47,375,000		157,540,000		143,707,000
Income Tax (Expense) Credit	(31,408,000)		(41,645,000)		(121,233,000)		(108,554,000)
Reclassifications from AOCI, Net of Income Tax (Expense) Credit	(163,000)		428,000		(2,103,000)		1,760,000
Gains and Losses on Available-for-Sale Securities
Interest Expense	52,738,000		47,375,000		157,540,000		143,707,000
Income Tax (Expense) Credit	(31,408,000)		(41,645,000)		(121,233,000)		(108,554,000)
Reclassifications from AOCI, Net of Income Tax (Expense) Credit	(163,000)		428,000		(2,103,000)		1,760,000
Amortization of Pension and OPEB
Income Tax (Expense) Credit	(31,408,000)		(41,645,000)		(121,233,000)		(108,554,000)
Reclassifications from AOCI, Net of Income Tax (Expense) Credit	(163,000)		428,000		(2,103,000)		1,760,000
Reclassifications from AOCI, Net of Income Tax (Expense) Credit	(163,000)		428,000		(2,103,000)		1,760,000
Appalachian Power Co [Member] | Cash Flow Hedges [Member]
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Amounts Reclassified from AOCI	170,000		69,000		(1,104,000)		685,000
Commodity:
Subtotal - Commodity	262,000		106,000		(1,696,000)		1,053,000
Interest Rate and Foreign Currency:
Subtotal - Interest Rate and Foreign Currency	262,000		106,000		(1,696,000)		1,053,000
Reclassifications from AOCI, before Income Tax (Expense) Credit	262,000		106,000		(1,696,000)		1,053,000
Reclassifications from AOCI, Net of Income Tax (Expense) Credit	170,000		69,000		(1,104,000)		685,000
Gains and Losses on Available-for-Sale Securities
Reclassifications from AOCI, before Income Tax (Expense) Credit	262,000		106,000		(1,696,000)		1,053,000
Reclassifications from AOCI, Net of Income Tax (Expense) Credit	170,000		69,000		(1,104,000)		685,000
Amortization of Pension and OPEB
Reclassifications from AOCI, before Income Tax (Expense) Credit	262,000		106,000		(1,696,000)		1,053,000
Reclassifications from AOCI, Net of Income Tax (Expense) Credit	170,000		69,000		(1,104,000)		685,000
Reclassifications from AOCI, Net of Income Tax (Expense) Credit	170,000		69,000		(1,104,000)		685,000
Appalachian Power Co [Member] | Pension and OPEB [Member]
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning Balance in AOCI	(899,000)		(30,615,000)		(233,000)		(31,331,000)
Change in Fair Value Recognized in AOCI	0		0		0		0
Amounts Reclassified from AOCI	(333,000)		359,000		(999,000)		1,075,000
Net Current Period Other Comprehensive Income	(333,000)		359,000		(999,000)		1,075,000
Ending Balance in AOCI	(1,232,000)		(30,256,000)		(1,232,000)		(30,256,000)
Commodity:
Subtotal - Commodity	(512,000)		552,000		(1,537,000)		1,654,000
Interest Rate and Foreign Currency:
Subtotal - Interest Rate and Foreign Currency	(512,000)		552,000		(1,537,000)		1,654,000
Reclassifications from AOCI, before Income Tax (Expense) Credit	(512,000)		552,000		(1,537,000)		1,654,000
Reclassifications from AOCI, Net of Income Tax (Expense) Credit	(333,000)		359,000		(999,000)		1,075,000
Gains and Losses on Available-for-Sale Securities
Reclassifications from AOCI, before Income Tax (Expense) Credit	(512,000)		552,000		(1,537,000)		1,654,000
Reclassifications from AOCI, Net of Income Tax (Expense) Credit	(333,000)		359,000		(999,000)		1,075,000
Amortization of Pension and OPEB
Prior Service Cost (Credit)	(1,281,000)		(1,282,000)		(3,846,000)		(3,847,000)
Actuarial (Gains)/Losses	769,000		1,834,000		2,309,000		5,501,000
Reclassifications from AOCI, before Income Tax (Expense) Credit	(512,000)		552,000		(1,537,000)		1,654,000
Reclassifications from AOCI, Net of Income Tax (Expense) Credit	(333,000)		359,000		(999,000)		1,075,000
Reclassifications from AOCI, Net of Income Tax (Expense) Credit	(333,000)		359,000		(999,000)		1,075,000
Appalachian Power Co [Member] | Commodity [Member] | Cash Flow Hedges [Member]
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning Balance in AOCI	0		197,000		94,000		(644,000)
Change in Fair Value Recognized in AOCI	0		(47,000)		1,686,000		684,000
Amounts Reclassified from AOCI	0		(184,000)		(1,780,000)		(74,000)
Net Current Period Other Comprehensive Income	0		(231,000)		(94,000)		610,000
Ending Balance in AOCI	0		(34,000)		0		(34,000)
Commodity:
Subtotal - Commodity	0		(284,000)		(2,738,000)		(116,000)
Interest Rate and Foreign Currency:
Subtotal - Interest Rate and Foreign Currency	0		(284,000)		(2,738,000)		(116,000)
Reclassifications from AOCI, before Income Tax (Expense) Credit	0		(284,000)		(2,738,000)		(116,000)
Reclassifications from AOCI, Net of Income Tax (Expense) Credit	0		(184,000)		(1,780,000)		(74,000)
Gains and Losses on Available-for-Sale Securities
Reclassifications from AOCI, before Income Tax (Expense) Credit	0		(284,000)		(2,738,000)		(116,000)
Reclassifications from AOCI, Net of Income Tax (Expense) Credit	0		(184,000)		(1,780,000)		(74,000)
Amortization of Pension and OPEB
Reclassifications from AOCI, before Income Tax (Expense) Credit	0		(284,000)		(2,738,000)		(116,000)
Reclassifications from AOCI, Net of Income Tax (Expense) Credit	0		(184,000)		(1,780,000)		(74,000)
Reclassifications from AOCI, Net of Income Tax (Expense) Credit	0		(184,000)		(1,780,000)		(74,000)
Appalachian Power Co [Member] | Interest Rate and Foreign Currency [Member] | Cash Flow Hedges [Member]
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning Balance in AOCI	3,596,000		2,583,000		3,090,000		2,077,000
Change in Fair Value Recognized in AOCI	0		0		0		0
Amounts Reclassified from AOCI	170,000		253,000		676,000		759,000
Net Current Period Other Comprehensive Income	170,000		253,000		676,000		759,000
Ending Balance in AOCI	3,766,000		2,836,000		3,766,000		2,836,000
Commodity:
Subtotal - Commodity	262,000		390,000		1,042,000		1,169,000
Interest Rate and Foreign Currency:
Subtotal - Interest Rate and Foreign Currency	262,000		390,000		1,042,000		1,169,000
Reclassifications from AOCI, before Income Tax (Expense) Credit	262,000		390,000		1,042,000		1,169,000
Reclassifications from AOCI, Net of Income Tax (Expense) Credit	170,000		253,000		676,000		759,000
Gains and Losses on Available-for-Sale Securities
Reclassifications from AOCI, before Income Tax (Expense) Credit	262,000		390,000		1,042,000		1,169,000
Reclassifications from AOCI, Net of Income Tax (Expense) Credit	170,000		253,000		676,000		759,000
Amortization of Pension and OPEB
Reclassifications from AOCI, before Income Tax (Expense) Credit	262,000		390,000		1,042,000		1,169,000
Reclassifications from AOCI, Net of Income Tax (Expense) Credit	170,000		253,000		676,000		759,000
Reclassifications from AOCI, Net of Income Tax (Expense) Credit	170,000		253,000		676,000		759,000
Appalachian Power Co [Member] | Reclassifications from Accumulated Other Comprehensive Income [Member] | Cash Flow Hedges [Member]
Interest Rate and Foreign Currency:
Income Tax (Expense) Credit	92,000		37,000		(592,000)		368,000
Gains and Losses on Available-for-Sale Securities
Income Tax (Expense) Credit	92,000		37,000		(592,000)		368,000
Amortization of Pension and OPEB
Income Tax (Expense) Credit	92,000		37,000		(592,000)		368,000
Appalachian Power Co [Member] | Reclassifications from Accumulated Other Comprehensive Income [Member] | Pension and OPEB [Member]
Interest Rate and Foreign Currency:
Income Tax (Expense) Credit	(179,000)		193,000		(538,000)		579,000
Gains and Losses on Available-for-Sale Securities
Income Tax (Expense) Credit	(179,000)		193,000		(538,000)		579,000
Amortization of Pension and OPEB
Income Tax (Expense) Credit	(179,000)		193,000		(538,000)		579,000
Appalachian Power Co [Member] | Reclassifications from Accumulated Other Comprehensive Income [Member] | Commodity [Member] | Cash Flow Hedges [Member]
Commodity:
Vertically Integrated Utilities	0		(75,000)		0		(53,000)
Purchased Electricity for Resale	0		21,000		(526,000)		47,000
Other Operation Expense	0		(14,000)		(10,000)		(38,000)
Maintenance Expense	0		(11,000)		(20,000)		(29,000)
Property, Plant and Equipment	0		(15,000)		(17,000)		(34,000)
Regulatory Assets/(Liabilities), Net	0	[1]	(190,000)	[1]	(2,165,000)	[1]	(9,000)	[1]
Appalachian Power Co [Member] | Reclassifications from Accumulated Other Comprehensive Income [Member] | Interest Rate and Foreign Currency [Member] | Cash Flow Hedges [Member]
Interest Rate and Foreign Currency:
Interest Expense	262,000		390,000		1,042,000		1,169,000
Gains and Losses on Available-for-Sale Securities
Interest Expense	262,000		390,000		1,042,000		1,169,000
Indiana Michigan Power Co [Member]
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning Balance in AOCI	(14,648,000)		(25,088,000)		(15,509,000)		(28,883,000)
Change in Fair Value Recognized in AOCI	0		(49,000)		1,130,000		2,691,000
Amounts Reclassified from AOCI	452,000		467,000		183,000		1,522,000
Net Current Period Other Comprehensive Income	452,000		418,000		1,313,000		4,213,000
Ending Balance in AOCI	(14,196,000)		(24,670,000)		(14,196,000)		(24,670,000)
Commodity:
Vertically Integrated Utilities	520,881,000		537,453,000		1,642,721,000		1,518,357,000
Generation & Marketing Revenues	749,000		514,000		1,298,000		3,552,000
Purchased Electricity for Resale	20,019,000		32,976,000		52,467,000		111,602,000
Other Operation Expense	144,331,000		136,702,000		431,953,000		414,418,000
Maintenance Expense	59,043,000		43,448,000		161,854,000		139,200,000
Interest Rate and Foreign Currency:
Depreciation and Amortization Expense	50,585,000		45,393,000		150,062,000		131,991,000
Interest Expense	22,617,000		23,932,000		71,955,000		72,579,000
Income Tax (Expense) Credit	(20,654,000)		(27,953,000)		(71,596,000)		(69,102,000)
Reclassifications from AOCI, Net of Income Tax (Expense) Credit	452,000		467,000		183,000		1,522,000
Gains and Losses on Available-for-Sale Securities
Interest Expense	22,617,000		23,932,000		71,955,000		72,579,000
Income Tax (Expense) Credit	(20,654,000)		(27,953,000)		(71,596,000)		(69,102,000)
Reclassifications from AOCI, Net of Income Tax (Expense) Credit	452,000		467,000		183,000		1,522,000
Amortization of Pension and OPEB
Income Tax (Expense) Credit	(20,654,000)		(27,953,000)		(71,596,000)		(69,102,000)
Reclassifications from AOCI, Net of Income Tax (Expense) Credit	452,000		467,000		183,000		1,522,000
Reclassifications from AOCI, Net of Income Tax (Expense) Credit	452,000		467,000		183,000		1,522,000
Indiana Michigan Power Co [Member] | Cash Flow Hedges [Member]
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Amounts Reclassified from AOCI	410,000		293,000		55,000		997,000
Commodity:
Subtotal - Commodity	631,000		451,000		84,000		1,534,000
Interest Rate and Foreign Currency:
Subtotal - Interest Rate and Foreign Currency	631,000		451,000		84,000		1,534,000
Reclassifications from AOCI, before Income Tax (Expense) Credit	631,000		451,000		84,000		1,534,000
Reclassifications from AOCI, Net of Income Tax (Expense) Credit	410,000		293,000		55,000		997,000
Gains and Losses on Available-for-Sale Securities
Reclassifications from AOCI, before Income Tax (Expense) Credit	631,000		451,000		84,000		1,534,000
Reclassifications from AOCI, Net of Income Tax (Expense) Credit	410,000		293,000		55,000		997,000
Amortization of Pension and OPEB
Reclassifications from AOCI, before Income Tax (Expense) Credit	631,000		451,000		84,000		1,534,000
Reclassifications from AOCI, Net of Income Tax (Expense) Credit	410,000		293,000		55,000		997,000
Reclassifications from AOCI, Net of Income Tax (Expense) Credit	410,000		293,000		55,000		997,000
Indiana Michigan Power Co [Member] | Pension and OPEB [Member]
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning Balance in AOCI	507,000		(8,439,000)		421,000		(8,790,000)
Change in Fair Value Recognized in AOCI	0		0		0		0
Amounts Reclassified from AOCI	42,000		174,000		128,000		525,000
Net Current Period Other Comprehensive Income	42,000		174,000		128,000		525,000
Ending Balance in AOCI	549,000		(8,265,000)		549,000		(8,265,000)
Commodity:
Subtotal - Commodity	64,000		268,000		194,000		808,000
Interest Rate and Foreign Currency:
Subtotal - Interest Rate and Foreign Currency	64,000		268,000		194,000		808,000
Reclassifications from AOCI, before Income Tax (Expense) Credit	64,000		268,000		194,000		808,000
Reclassifications from AOCI, Net of Income Tax (Expense) Credit	42,000		174,000		128,000		525,000
Gains and Losses on Available-for-Sale Securities
Reclassifications from AOCI, before Income Tax (Expense) Credit	64,000		268,000		194,000		808,000
Reclassifications from AOCI, Net of Income Tax (Expense) Credit	42,000		174,000		128,000		525,000
Amortization of Pension and OPEB
Prior Service Cost (Credit)	(200,000)		(199,000)		(597,000)		(596,000)
Actuarial (Gains)/Losses	264,000		467,000		791,000		1,404,000
Reclassifications from AOCI, before Income Tax (Expense) Credit	64,000		268,000		194,000		808,000
Reclassifications from AOCI, Net of Income Tax (Expense) Credit	42,000		174,000		128,000		525,000
Reclassifications from AOCI, Net of Income Tax (Expense) Credit	42,000		174,000		128,000		525,000
Indiana Michigan Power Co [Member] | Commodity [Member] | Cash Flow Hedges [Member]
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning Balance in AOCI	0		147,000		46,000		(446,000)
Change in Fair Value Recognized in AOCI	0		(49,000)		1,130,000		443,000
Amounts Reclassified from AOCI	0		(117,000)		(1,176,000)		(16,000)
Net Current Period Other Comprehensive Income	0		(166,000)		(46,000)		427,000
Ending Balance in AOCI	0		(19,000)		0		(19,000)
Commodity:
Subtotal - Commodity	0		(180,000)		(1,809,000)		(24,000)
Interest Rate and Foreign Currency:
Subtotal - Interest Rate and Foreign Currency	0		(180,000)		(1,809,000)		(24,000)
Reclassifications from AOCI, before Income Tax (Expense) Credit	0		(180,000)		(1,809,000)		(24,000)
Reclassifications from AOCI, Net of Income Tax (Expense) Credit	0		(117,000)		(1,176,000)		(16,000)
Gains and Losses on Available-for-Sale Securities
Reclassifications from AOCI, before Income Tax (Expense) Credit	0		(180,000)		(1,809,000)		(24,000)
Reclassifications from AOCI, Net of Income Tax (Expense) Credit	0		(117,000)		(1,176,000)		(16,000)
Amortization of Pension and OPEB
Reclassifications from AOCI, before Income Tax (Expense) Credit	0		(180,000)		(1,809,000)		(24,000)
Reclassifications from AOCI, Net of Income Tax (Expense) Credit	0		(117,000)		(1,176,000)		(16,000)
Reclassifications from AOCI, Net of Income Tax (Expense) Credit	0		(117,000)		(1,176,000)		(16,000)
Indiana Michigan Power Co [Member] | Interest Rate and Foreign Currency [Member] | Cash Flow Hedges [Member]
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning Balance in AOCI	(15,155,000)		(16,796,000)		(15,976,000)		(19,647,000)
Change in Fair Value Recognized in AOCI	0		0		0		2,248,000
Amounts Reclassified from AOCI	410,000		410,000		1,231,000		1,013,000
Net Current Period Other Comprehensive Income	410,000		410,000		1,231,000		3,261,000
Ending Balance in AOCI	(14,745,000)		(16,386,000)		(14,745,000)		(16,386,000)
Commodity:
Subtotal - Commodity	631,000		631,000		1,893,000		1,558,000
Interest Rate and Foreign Currency:
Subtotal - Interest Rate and Foreign Currency	631,000		631,000		1,893,000		1,558,000
Reclassifications from AOCI, before Income Tax (Expense) Credit	631,000		631,000		1,893,000		1,558,000
Reclassifications from AOCI, Net of Income Tax (Expense) Credit	410,000		410,000		1,231,000		1,013,000
Gains and Losses on Available-for-Sale Securities
Reclassifications from AOCI, before Income Tax (Expense) Credit	631,000		631,000		1,893,000		1,558,000
Reclassifications from AOCI, Net of Income Tax (Expense) Credit	410,000		410,000		1,231,000		1,013,000
Amortization of Pension and OPEB
Reclassifications from AOCI, before Income Tax (Expense) Credit	631,000		631,000		1,893,000		1,558,000
Reclassifications from AOCI, Net of Income Tax (Expense) Credit	410,000		410,000		1,231,000		1,013,000
Reclassifications from AOCI, Net of Income Tax (Expense) Credit	410,000		410,000		1,231,000		1,013,000
Indiana Michigan Power Co [Member] | Reclassifications from Accumulated Other Comprehensive Income [Member] | Cash Flow Hedges [Member]
Interest Rate and Foreign Currency:
Income Tax (Expense) Credit	221,000		158,000		29,000		537,000
Gains and Losses on Available-for-Sale Securities
Income Tax (Expense) Credit	221,000		158,000		29,000		537,000
Amortization of Pension and OPEB
Income Tax (Expense) Credit	221,000		158,000		29,000		537,000
Indiana Michigan Power Co [Member] | Reclassifications from Accumulated Other Comprehensive Income [Member] | Pension and OPEB [Member]
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Amounts Reclassified from AOCI	42,000		174,000
Interest Rate and Foreign Currency:
Income Tax (Expense) Credit	22,000		94,000		66,000		283,000
Reclassifications from AOCI, Net of Income Tax (Expense) Credit	42,000		174,000
Gains and Losses on Available-for-Sale Securities
Income Tax (Expense) Credit	22,000		94,000		66,000		283,000
Reclassifications from AOCI, Net of Income Tax (Expense) Credit	42,000		174,000
Amortization of Pension and OPEB
Income Tax (Expense) Credit	22,000		94,000		66,000		283,000
Reclassifications from AOCI, Net of Income Tax (Expense) Credit	42,000		174,000
Reclassifications from AOCI, Net of Income Tax (Expense) Credit	42,000		174,000
Indiana Michigan Power Co [Member] | Reclassifications from Accumulated Other Comprehensive Income [Member] | Commodity [Member] | Cash Flow Hedges [Member]
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Ending Balance in AOCI	0		(19,000)		0		(19,000)
Commodity:
Vertically Integrated Utilities	0		(173,000)		0		(89,000)
Purchased Electricity for Resale	0		47,000		(812,000)		115,000
Other Operation Expense	0		(8,000)		(7,000)		(23,000)
Maintenance Expense	0		(5,000)		(7,000)		(14,000)
Property, Plant and Equipment	0		(10,000)		(10,000)		(20,000)
Regulatory Assets/(Liabilities), Net	0	[1]	(31,000)	[1]	(973,000)	[1]	7,000	[1]
Indiana Michigan Power Co [Member] | Reclassifications from Accumulated Other Comprehensive Income [Member] | Interest Rate and Foreign Currency [Member] | Cash Flow Hedges [Member]
Interest Rate and Foreign Currency:
Interest Expense	631,000		631,000		1,893,000		1,558,000
Gains and Losses on Available-for-Sale Securities
Interest Expense	631,000		631,000		1,893,000		1,558,000
Ohio Power Co [Member]
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning Balance in AOCI	6,288,000		(158,665,000)		7,079,000		(165,725,000)
Change in Fair Value Recognized in AOCI	0		(86,000)		0		907,000
Amounts Reclassified from AOCI	(343,000)		2,396,000		(1,134,000)		8,463,000
Net Current Period Other Comprehensive Income	(343,000)		2,310,000		(1,134,000)		9,370,000
Distribution of Cook Coal Terminal to Parent			19,652,000				19,652,000
Ending Balance in AOCI	5,945,000		(136,703,000)		5,945,000		(136,703,000)
Commodity:
Generation & Marketing Revenues	1,564,000		2,827,000		4,628,000		12,982,000
Purchased Electricity for Resale	48,541,000		34,568,000		191,730,000		114,911,000
Other Operation Expense	145,163,000		159,965,000		428,074,000		481,417,000
Maintenance Expense	53,724,000		71,670,000		136,965,000		218,962,000
Interest Rate and Foreign Currency:
Depreciation and Amortization Expense	54,968,000		94,802,000		165,152,000		289,472,000
Interest Expense	31,171,000		45,070,000		96,937,000		142,487,000
Income Tax (Expense) Credit	(28,865,000)		(93,141,000)		(98,759,000)		(174,313,000)
Reclassifications from AOCI, Net of Income Tax (Expense) Credit	(343,000)		2,396,000		(1,134,000)		8,463,000
Gains and Losses on Available-for-Sale Securities
Interest Expense	31,171,000		45,070,000		96,937,000		142,487,000
Income Tax (Expense) Credit	(28,865,000)		(93,141,000)		(98,759,000)		(174,313,000)
Reclassifications from AOCI, Net of Income Tax (Expense) Credit	(343,000)		2,396,000		(1,134,000)		8,463,000
Amortization of Pension and OPEB
Income Tax (Expense) Credit	(28,865,000)		(93,141,000)		(98,759,000)		(174,313,000)
Reclassifications from AOCI, Net of Income Tax (Expense) Credit	(343,000)		2,396,000		(1,134,000)		8,463,000
Reclassifications from AOCI, Net of Income Tax (Expense) Credit	(343,000)		2,396,000		(1,134,000)		8,463,000
Ohio Power Co [Member] | Cash Flow Hedges [Member]
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Amounts Reclassified from AOCI	(343,000)		(589,000)		(1,134,000)		(1,061,000)
Commodity:
Subtotal - Commodity	(527,000)		(906,000)		(1,743,000)		(1,632,000)
Interest Rate and Foreign Currency:
Subtotal - Interest Rate and Foreign Currency	(527,000)		(906,000)		(1,743,000)		(1,632,000)
Reclassifications from AOCI, before Income Tax (Expense) Credit	(527,000)		(906,000)		(1,743,000)		(1,632,000)
Reclassifications from AOCI, Net of Income Tax (Expense) Credit	(343,000)		(589,000)		(1,134,000)		(1,061,000)
Gains and Losses on Available-for-Sale Securities
Reclassifications from AOCI, before Income Tax (Expense) Credit	(527,000)		(906,000)		(1,743,000)		(1,632,000)
Reclassifications from AOCI, Net of Income Tax (Expense) Credit	(343,000)		(589,000)		(1,134,000)		(1,061,000)
Amortization of Pension and OPEB
Reclassifications from AOCI, before Income Tax (Expense) Credit	(527,000)		(906,000)		(1,743,000)		(1,632,000)
Reclassifications from AOCI, Net of Income Tax (Expense) Credit	(343,000)		(589,000)		(1,134,000)		(1,061,000)
Reclassifications from AOCI, Net of Income Tax (Expense) Credit	(343,000)		(589,000)		(1,134,000)		(1,061,000)
Ohio Power Co [Member] | Pension and OPEB [Member]
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning Balance in AOCI	0		(166,369,000)		0		(172,908,000)
Change in Fair Value Recognized in AOCI	0		0		0		0
Amounts Reclassified from AOCI	0		2,985,000		0		9,524,000
Net Current Period Other Comprehensive Income	0		2,985,000		0		9,524,000
Distribution of Cook Coal Terminal to Parent			19,652,000				19,652,000
Ending Balance in AOCI	0		(143,732,000)		0		(143,732,000)
Commodity:
Subtotal - Commodity	0		4,593,000		0		14,652,000
Interest Rate and Foreign Currency:
Subtotal - Interest Rate and Foreign Currency	0		4,593,000		0		14,652,000
Reclassifications from AOCI, before Income Tax (Expense) Credit	0		4,593,000		0		14,652,000
Reclassifications from AOCI, Net of Income Tax (Expense) Credit	0		2,985,000		0		9,524,000
Gains and Losses on Available-for-Sale Securities
Reclassifications from AOCI, before Income Tax (Expense) Credit	0		4,593,000		0		14,652,000
Reclassifications from AOCI, Net of Income Tax (Expense) Credit	0		2,985,000		0		9,524,000
Amortization of Pension and OPEB
Prior Service Cost (Credit)	0		(1,451,000)		0		(4,388,000)
Actuarial (Gains)/Losses	0		6,044,000		0		19,040,000
Reclassifications from AOCI, before Income Tax (Expense) Credit	0		4,593,000		0		14,652,000
Reclassifications from AOCI, Net of Income Tax (Expense) Credit	0		2,985,000		0		9,524,000
Reclassifications from AOCI, Net of Income Tax (Expense) Credit	0		2,985,000		0		9,524,000
Ohio Power Co [Member] | Commodity [Member] | Cash Flow Hedges [Member]
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning Balance in AOCI	0		289,000		105,000		(912,000)
Change in Fair Value Recognized in AOCI	0		(86,000)		0		907,000
Amounts Reclassified from AOCI	0		(250,000)		(105,000)		(42,000)
Net Current Period Other Comprehensive Income	0		(336,000)		(105,000)		865,000
Distribution of Cook Coal Terminal to Parent			0				0
Ending Balance in AOCI	0		(47,000)		0		(47,000)
Commodity:
Subtotal - Commodity	0		(384,000)		(162,000)		(64,000)
Interest Rate and Foreign Currency:
Subtotal - Interest Rate and Foreign Currency	0		(384,000)		(162,000)		(64,000)
Reclassifications from AOCI, before Income Tax (Expense) Credit	0		(384,000)		(162,000)		(64,000)
Reclassifications from AOCI, Net of Income Tax (Expense) Credit	0		(250,000)		(105,000)		(42,000)
Gains and Losses on Available-for-Sale Securities
Reclassifications from AOCI, before Income Tax (Expense) Credit	0		(384,000)		(162,000)		(64,000)
Reclassifications from AOCI, Net of Income Tax (Expense) Credit	0		(250,000)		(105,000)		(42,000)
Amortization of Pension and OPEB
Reclassifications from AOCI, before Income Tax (Expense) Credit	0		(384,000)		(162,000)		(64,000)
Reclassifications from AOCI, Net of Income Tax (Expense) Credit	0		(250,000)		(105,000)		(42,000)
Reclassifications from AOCI, Net of Income Tax (Expense) Credit	0		(250,000)		(105,000)		(42,000)
Ohio Power Co [Member] | Interest Rate and Foreign Currency [Member] | Cash Flow Hedges [Member]
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning Balance in AOCI	6,288,000		7,415,000		6,974,000		8,095,000
Change in Fair Value Recognized in AOCI	0		0		0		0
Amounts Reclassified from AOCI	(343,000)		(339,000)		(1,029,000)		(1,019,000)
Net Current Period Other Comprehensive Income	(343,000)		(339,000)		(1,029,000)		(1,019,000)
Distribution of Cook Coal Terminal to Parent			0				0
Ending Balance in AOCI	5,945,000		7,076,000		5,945,000		7,076,000
Commodity:
Subtotal - Commodity	(527,000)		(522,000)		(1,581,000)		(1,568,000)
Interest Rate and Foreign Currency:
Subtotal - Interest Rate and Foreign Currency	(527,000)		(522,000)		(1,581,000)		(1,568,000)
Reclassifications from AOCI, before Income Tax (Expense) Credit	(527,000)		(522,000)		(1,581,000)		(1,568,000)
Reclassifications from AOCI, Net of Income Tax (Expense) Credit	(343,000)		(339,000)		(1,029,000)		(1,019,000)
Gains and Losses on Available-for-Sale Securities
Reclassifications from AOCI, before Income Tax (Expense) Credit	(527,000)		(522,000)		(1,581,000)		(1,568,000)
Reclassifications from AOCI, Net of Income Tax (Expense) Credit	(343,000)		(339,000)		(1,029,000)		(1,019,000)
Amortization of Pension and OPEB
Reclassifications from AOCI, before Income Tax (Expense) Credit	(527,000)		(522,000)		(1,581,000)		(1,568,000)
Reclassifications from AOCI, Net of Income Tax (Expense) Credit	(343,000)		(339,000)		(1,029,000)		(1,019,000)
Reclassifications from AOCI, Net of Income Tax (Expense) Credit	(343,000)		(339,000)		(1,029,000)		(1,019,000)
Ohio Power Co [Member] | Reclassifications from Accumulated Other Comprehensive Income [Member] | Cash Flow Hedges [Member]
Interest Rate and Foreign Currency:
Income Tax (Expense) Credit	(184,000)		(317,000)		(609,000)		(571,000)
Gains and Losses on Available-for-Sale Securities
Income Tax (Expense) Credit	(184,000)		(317,000)		(609,000)		(571,000)
Amortization of Pension and OPEB
Income Tax (Expense) Credit	(184,000)		(317,000)		(609,000)		(571,000)
Ohio Power Co [Member] | Reclassifications from Accumulated Other Comprehensive Income [Member] | Pension and OPEB [Member]
Interest Rate and Foreign Currency:
Income Tax (Expense) Credit	0		1,608,000		0		5,128,000
Gains and Losses on Available-for-Sale Securities
Income Tax (Expense) Credit	0		1,608,000		0		5,128,000
Amortization of Pension and OPEB
Income Tax (Expense) Credit	0		1,608,000		0		5,128,000
Ohio Power Co [Member] | Reclassifications from Accumulated Other Comprehensive Income [Member] | Commodity [Member] | Cash Flow Hedges [Member]
Commodity:
Vertically Integrated Utilities	0		(461,000)		0		(246,000)
Purchased Electricity for Resale	0		129,000		0		309,000
Other Operation Expense	0		(20,000)		(11,000)		(57,000)
Maintenance Expense	0		(11,000)		(11,000)		(26,000)
Property, Plant and Equipment	0		(21,000)		(18,000)		(44,000)
Regulatory Assets/(Liabilities), Net					(122,000)	[1]	0	[1]
Ohio Power Co [Member] | Reclassifications from Accumulated Other Comprehensive Income [Member] | Interest Rate and Foreign Currency [Member] | Cash Flow Hedges [Member]
Interest Rate and Foreign Currency:
Depreciation and Amortization Expense	(3,000)		2,000		(9,000)		5,000
Interest Expense	(524,000)		(524,000)		(1,572,000)		(1,573,000)
Gains and Losses on Available-for-Sale Securities
Interest Expense	(524,000)		(524,000)		(1,572,000)		(1,573,000)
Public Service Co Of Oklahoma [Member]
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning Balance in AOCI	5,322,000		6,060,000		5,758,000		6,481,000
Change in Fair Value Recognized in AOCI	0		32,000		0		8,000
Amounts Reclassified from AOCI	(190,000)		(204,000)		(626,000)		(601,000)
Net Current Period Other Comprehensive Income	(190,000)		(172,000)		(626,000)		(593,000)
Ending Balance in AOCI	5,132,000		5,888,000		5,132,000		5,888,000
Commodity:
Vertically Integrated Utilities	415,193,000		408,803,000		1,028,427,000		986,008,000
Generation & Marketing Revenues	1,009,000		621,000		2,524,000		2,865,000
Purchased Electricity for Resale	117,521,000		55,915,000		301,816,000		179,405,000
Other Operation Expense	71,605,000		60,566,000		193,101,000		162,032,000
Maintenance Expense	21,800,000		25,071,000		76,223,000		78,396,000
Interest Rate and Foreign Currency:
Depreciation and Amortization Expense	24,496,000		24,191,000		73,085,000		72,449,000
Interest Expense	13,913,000		13,417,000		41,009,000		40,016,000
Income Tax (Expense) Credit	(28,746,000)		(32,217,000)		(46,979,000)		(58,778,000)
Reclassifications from AOCI, Net of Income Tax (Expense) Credit	(190,000)		(204,000)		(626,000)		(601,000)
Gains and Losses on Available-for-Sale Securities
Interest Expense	13,913,000		13,417,000		41,009,000		40,016,000
Income Tax (Expense) Credit	(28,746,000)		(32,217,000)		(46,979,000)		(58,778,000)
Reclassifications from AOCI, Net of Income Tax (Expense) Credit	(190,000)		(204,000)		(626,000)		(601,000)
Amortization of Pension and OPEB
Income Tax (Expense) Credit	(28,746,000)		(32,217,000)		(46,979,000)		(58,778,000)
Reclassifications from AOCI, Net of Income Tax (Expense) Credit	(190,000)		(204,000)		(626,000)		(601,000)
Reclassifications from AOCI, Net of Income Tax (Expense) Credit	(190,000)		(204,000)		(626,000)		(601,000)
Public Service Co Of Oklahoma [Member] | Cash Flow Hedges [Member]
Commodity:
Subtotal - Commodity	(292,000)		(314,000)		(964,000)		(924,000)
Interest Rate and Foreign Currency:
Subtotal - Interest Rate and Foreign Currency	(292,000)		(314,000)		(964,000)		(924,000)
Reclassifications from AOCI, before Income Tax (Expense) Credit	(292,000)		(314,000)		(964,000)		(924,000)
Gains and Losses on Available-for-Sale Securities
Reclassifications from AOCI, before Income Tax (Expense) Credit	(292,000)		(314,000)		(964,000)		(924,000)
Amortization of Pension and OPEB
Reclassifications from AOCI, before Income Tax (Expense) Credit	(292,000)		(314,000)		(964,000)		(924,000)
Public Service Co Of Oklahoma [Member] | Commodity [Member] | Cash Flow Hedges [Member]
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning Balance in AOCI	0		(21,000)		57,000		21,000
Change in Fair Value Recognized in AOCI	0		32,000		0		7,000
Amounts Reclassified from AOCI	0		(14,000)		(57,000)		(31,000)
Net Current Period Other Comprehensive Income	0		18,000		(57,000)		(24,000)
Ending Balance in AOCI	0		(3,000)		0		(3,000)
Commodity:
Subtotal - Commodity	0		(22,000)		(88,000)		(48,000)
Interest Rate and Foreign Currency:
Subtotal - Interest Rate and Foreign Currency	0		(22,000)		(88,000)		(48,000)
Reclassifications from AOCI, before Income Tax (Expense) Credit	0		(22,000)		(88,000)		(48,000)
Reclassifications from AOCI, Net of Income Tax (Expense) Credit	0		(14,000)		(57,000)		(31,000)
Gains and Losses on Available-for-Sale Securities
Reclassifications from AOCI, before Income Tax (Expense) Credit	0		(22,000)		(88,000)		(48,000)
Reclassifications from AOCI, Net of Income Tax (Expense) Credit	0		(14,000)		(57,000)		(31,000)
Amortization of Pension and OPEB
Reclassifications from AOCI, before Income Tax (Expense) Credit	0		(22,000)		(88,000)		(48,000)
Reclassifications from AOCI, Net of Income Tax (Expense) Credit	0		(14,000)		(57,000)		(31,000)
Reclassifications from AOCI, Net of Income Tax (Expense) Credit	0		(14,000)		(57,000)		(31,000)
Public Service Co Of Oklahoma [Member] | Interest Rate and Foreign Currency [Member] | Cash Flow Hedges [Member]
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning Balance in AOCI	5,322,000		6,081,000		5,701,000		6,460,000
Change in Fair Value Recognized in AOCI	0		0		0		1,000
Amounts Reclassified from AOCI	(190,000)		(190,000)		(569,000)		(570,000)
Net Current Period Other Comprehensive Income	(190,000)		(190,000)		(569,000)		(569,000)
Ending Balance in AOCI	5,132,000		5,891,000		5,132,000		5,891,000
Commodity:
Subtotal - Commodity	(292,000)		(292,000)		(876,000)		(876,000)
Interest Rate and Foreign Currency:
Subtotal - Interest Rate and Foreign Currency	(292,000)		(292,000)		(876,000)		(876,000)
Reclassifications from AOCI, before Income Tax (Expense) Credit	(292,000)		(292,000)		(876,000)		(876,000)
Reclassifications from AOCI, Net of Income Tax (Expense) Credit	(190,000)		(190,000)		(569,000)		(570,000)
Gains and Losses on Available-for-Sale Securities
Reclassifications from AOCI, before Income Tax (Expense) Credit	(292,000)		(292,000)		(876,000)		(876,000)
Reclassifications from AOCI, Net of Income Tax (Expense) Credit	(190,000)		(190,000)		(569,000)		(570,000)
Amortization of Pension and OPEB
Reclassifications from AOCI, before Income Tax (Expense) Credit	(292,000)		(292,000)		(876,000)		(876,000)
Reclassifications from AOCI, Net of Income Tax (Expense) Credit	(190,000)		(190,000)		(569,000)		(570,000)
Reclassifications from AOCI, Net of Income Tax (Expense) Credit	(190,000)		(190,000)		(569,000)		(570,000)
Public Service Co Of Oklahoma [Member] | Reclassifications from Accumulated Other Comprehensive Income [Member]
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Amounts Reclassified from AOCI					(626,000)		(601,000)
Interest Rate and Foreign Currency:
Reclassifications from AOCI, Net of Income Tax (Expense) Credit					(626,000)		(601,000)
Gains and Losses on Available-for-Sale Securities
Reclassifications from AOCI, Net of Income Tax (Expense) Credit					(626,000)		(601,000)
Amortization of Pension and OPEB
Reclassifications from AOCI, Net of Income Tax (Expense) Credit					(626,000)		(601,000)
Reclassifications from AOCI, Net of Income Tax (Expense) Credit					(626,000)		(601,000)
Public Service Co Of Oklahoma [Member] | Reclassifications from Accumulated Other Comprehensive Income [Member] | Cash Flow Hedges [Member]
Interest Rate and Foreign Currency:
Income Tax (Expense) Credit	(102,000)		(110,000)		(338,000)		(323,000)
Gains and Losses on Available-for-Sale Securities
Income Tax (Expense) Credit	(102,000)		(110,000)		(338,000)		(323,000)
Amortization of Pension and OPEB
Income Tax (Expense) Credit	(102,000)		(110,000)		(338,000)		(323,000)
Public Service Co Of Oklahoma [Member] | Reclassifications from Accumulated Other Comprehensive Income [Member] | Commodity [Member] | Cash Flow Hedges [Member]
Commodity:
Other Operation Expense	0		(10,000)		(8,000)		(25,000)
Maintenance Expense	0		(5,000)		(9,000)		(9,000)
Property, Plant and Equipment	0		(7,000)		(13,000)		(14,000)
Regulatory Assets/(Liabilities), Net					(58,000)	[1]	0	[1]
Public Service Co Of Oklahoma [Member] | Reclassifications from Accumulated Other Comprehensive Income [Member] | Interest Rate and Foreign Currency [Member] | Cash Flow Hedges [Member]
Interest Rate and Foreign Currency:
Interest Expense	(292,000)		(292,000)		(876,000)		(876,000)
Gains and Losses on Available-for-Sale Securities
Interest Expense	(292,000)		(292,000)		(876,000)		(876,000)
Southwestern Electric Power Co [Member]
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning Balance in AOCI	(7,844,000)		(16,901,000)		(8,444,000)		(17,860,000)
Change in Fair Value Recognized in AOCI	0		40,000		0		13,000
Amounts Reclassified from AOCI	332,000		485,000		932,000		1,471,000
Net Current Period Other Comprehensive Income	332,000		525,000		932,000		1,484,000
Ending Balance in AOCI	(7,512,000)		(16,376,000)		(7,512,000)		(16,376,000)
Commodity:
Vertically Integrated Utilities	526,047,000		534,196,000		1,397,326,000		1,324,325,000
Generation & Marketing Revenues	521,000		441,000		1,570,000		1,163,000
Purchased Electricity for Resale	36,960,000		37,505,000		138,380,000		120,273,000
Other Operation Expense	68,601,000		62,108,000		206,442,000		182,351,000
Maintenance Expense	29,867,000		24,654,000		93,946,000		84,725,000
Interest Rate and Foreign Currency:
Depreciation and Amortization Expense	46,791,000		41,846,000		138,316,000		132,460,000
Interest Expense	31,644,000		32,614,000		95,258,000		100,151,000
Income Tax (Expense) Credit	(31,042,000)		(14,935,000)		(60,252,000)		(37,057,000)
Reclassifications from AOCI, Net of Income Tax (Expense) Credit	332,000		485,000		932,000		1,471,000
Gains and Losses on Available-for-Sale Securities
Interest Expense	31,644,000		32,614,000		95,258,000		100,151,000
Income Tax (Expense) Credit	(31,042,000)		(14,935,000)		(60,252,000)		(37,057,000)
Reclassifications from AOCI, Net of Income Tax (Expense) Credit	332,000		485,000		932,000		1,471,000
Amortization of Pension and OPEB
Income Tax (Expense) Credit	(31,042,000)		(14,935,000)		(60,252,000)		(37,057,000)
Reclassifications from AOCI, Net of Income Tax (Expense) Credit	332,000		485,000		932,000		1,471,000
Reclassifications from AOCI, Net of Income Tax (Expense) Credit	332,000		485,000		932,000		1,471,000
Southwestern Electric Power Co [Member] | Cash Flow Hedges [Member]
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Amounts Reclassified from AOCI	567,000		549,000		1,636,000		1,662,000
Commodity:
Subtotal - Commodity	872,000		845,000		2,515,000		2,558,000
Interest Rate and Foreign Currency:
Subtotal - Interest Rate and Foreign Currency	872,000		845,000		2,515,000		2,558,000
Reclassifications from AOCI, before Income Tax (Expense) Credit	872,000		845,000		2,515,000		2,558,000
Reclassifications from AOCI, Net of Income Tax (Expense) Credit	567,000		549,000		1,636,000		1,662,000
Gains and Losses on Available-for-Sale Securities
Reclassifications from AOCI, before Income Tax (Expense) Credit	872,000		845,000		2,515,000		2,558,000
Reclassifications from AOCI, Net of Income Tax (Expense) Credit	567,000		549,000		1,636,000		1,662,000
Amortization of Pension and OPEB
Reclassifications from AOCI, before Income Tax (Expense) Credit	872,000		845,000		2,515,000		2,558,000
Reclassifications from AOCI, Net of Income Tax (Expense) Credit	567,000		549,000		1,636,000		1,662,000
Reclassifications from AOCI, Net of Income Tax (Expense) Credit	567,000		549,000		1,636,000		1,662,000
Southwestern Electric Power Co [Member] | Pension and OPEB [Member]
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning Balance in AOCI	4,325,000		(2,438,000)		4,794,000		(2,311,000)
Change in Fair Value Recognized in AOCI	0		0		0		0
Amounts Reclassified from AOCI	(235,000)		(64,000)		(704,000)		(191,000)
Net Current Period Other Comprehensive Income	(235,000)		(64,000)		(704,000)		(191,000)
Ending Balance in AOCI	4,090,000		(2,502,000)		4,090,000		(2,502,000)
Commodity:
Subtotal - Commodity	(360,000)		(98,000)		(1,082,000)		(294,000)
Interest Rate and Foreign Currency:
Subtotal - Interest Rate and Foreign Currency	(360,000)		(98,000)		(1,082,000)		(294,000)
Reclassifications from AOCI, before Income Tax (Expense) Credit	(360,000)		(98,000)		(1,082,000)		(294,000)
Reclassifications from AOCI, Net of Income Tax (Expense) Credit	(235,000)		(64,000)		(704,000)		(191,000)
Gains and Losses on Available-for-Sale Securities
Reclassifications from AOCI, before Income Tax (Expense) Credit	(360,000)		(98,000)		(1,082,000)		(294,000)
Reclassifications from AOCI, Net of Income Tax (Expense) Credit	(235,000)		(64,000)		(704,000)		(191,000)
Amortization of Pension and OPEB
Prior Service Cost (Credit)	(478,000)		(446,000)		(1,433,000)		(1,338,000)
Actuarial (Gains)/Losses	118,000		348,000		351,000		1,044,000
Reclassifications from AOCI, before Income Tax (Expense) Credit	(360,000)		(98,000)		(1,082,000)		(294,000)
Reclassifications from AOCI, Net of Income Tax (Expense) Credit	(235,000)		(64,000)		(704,000)		(191,000)
Reclassifications from AOCI, Net of Income Tax (Expense) Credit	(235,000)		(64,000)		(704,000)		(191,000)
Southwestern Electric Power Co [Member] | Commodity [Member] | Cash Flow Hedges [Member]
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning Balance in AOCI	0		(26,000)		66,000		22,000
Change in Fair Value Recognized in AOCI	0		40,000		0		13,000
Amounts Reclassified from AOCI	0		(17,000)		(66,000)		(38,000)
Net Current Period Other Comprehensive Income	0		23,000		(66,000)		(25,000)
Ending Balance in AOCI	0		(3,000)		0		(3,000)
Commodity:
Subtotal - Commodity	0		(27,000)		(101,000)		(58,000)
Interest Rate and Foreign Currency:
Subtotal - Interest Rate and Foreign Currency	0		(27,000)		(101,000)		(58,000)
Reclassifications from AOCI, before Income Tax (Expense) Credit	0		(27,000)		(101,000)		(58,000)
Reclassifications from AOCI, Net of Income Tax (Expense) Credit	0		(17,000)		(66,000)		(38,000)
Gains and Losses on Available-for-Sale Securities
Reclassifications from AOCI, before Income Tax (Expense) Credit	0		(27,000)		(101,000)		(58,000)
Reclassifications from AOCI, Net of Income Tax (Expense) Credit	0		(17,000)		(66,000)		(38,000)
Amortization of Pension and OPEB
Reclassifications from AOCI, before Income Tax (Expense) Credit	0		(27,000)		(101,000)		(58,000)
Reclassifications from AOCI, Net of Income Tax (Expense) Credit	0		(17,000)		(66,000)		(38,000)
Reclassifications from AOCI, Net of Income Tax (Expense) Credit	0		(17,000)		(66,000)		(38,000)
Southwestern Electric Power Co [Member] | Interest Rate and Foreign Currency [Member] | Cash Flow Hedges [Member]
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning Balance in AOCI	(12,169,000)		(14,437,000)		(13,304,000)		(15,571,000)
Change in Fair Value Recognized in AOCI	0		0		0		0
Amounts Reclassified from AOCI	567,000		566,000		1,702,000		1,700,000
Net Current Period Other Comprehensive Income	567,000		566,000		1,702,000		1,700,000
Ending Balance in AOCI	(11,602,000)		(13,871,000)		(11,602,000)		(13,871,000)
Commodity:
Subtotal - Commodity	872,000		872,000		2,616,000		2,616,000
Interest Rate and Foreign Currency:
Subtotal - Interest Rate and Foreign Currency	872,000		872,000		2,616,000		2,616,000
Reclassifications from AOCI, before Income Tax (Expense) Credit	872,000		872,000		2,616,000		2,616,000
Reclassifications from AOCI, Net of Income Tax (Expense) Credit	567,000		566,000		1,702,000		1,700,000
Gains and Losses on Available-for-Sale Securities
Reclassifications from AOCI, before Income Tax (Expense) Credit	872,000		872,000		2,616,000		2,616,000
Reclassifications from AOCI, Net of Income Tax (Expense) Credit	567,000		566,000		1,702,000		1,700,000
Amortization of Pension and OPEB
Reclassifications from AOCI, before Income Tax (Expense) Credit	872,000		872,000		2,616,000		2,616,000
Reclassifications from AOCI, Net of Income Tax (Expense) Credit	567,000		566,000		1,702,000		1,700,000
Reclassifications from AOCI, Net of Income Tax (Expense) Credit	567,000		566,000		1,702,000		1,700,000
Southwestern Electric Power Co [Member] | Reclassifications from Accumulated Other Comprehensive Income [Member]
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Amounts Reclassified from AOCI	332,000
Interest Rate and Foreign Currency:
Reclassifications from AOCI, Net of Income Tax (Expense) Credit	332,000
Gains and Losses on Available-for-Sale Securities
Reclassifications from AOCI, Net of Income Tax (Expense) Credit	332,000
Amortization of Pension and OPEB
Reclassifications from AOCI, Net of Income Tax (Expense) Credit	332,000
Reclassifications from AOCI, Net of Income Tax (Expense) Credit	332,000
Southwestern Electric Power Co [Member] | Reclassifications from Accumulated Other Comprehensive Income [Member] | Cash Flow Hedges [Member]
Interest Rate and Foreign Currency:
Income Tax (Expense) Credit	305,000		296,000		879,000		896,000
Gains and Losses on Available-for-Sale Securities
Income Tax (Expense) Credit	305,000		296,000		879,000		896,000
Amortization of Pension and OPEB
Income Tax (Expense) Credit	305,000		296,000		879,000		896,000
Southwestern Electric Power Co [Member] | Reclassifications from Accumulated Other Comprehensive Income [Member] | Pension and OPEB [Member]
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Amounts Reclassified from AOCI	(235,000)		(64,000)
Interest Rate and Foreign Currency:
Income Tax (Expense) Credit	(125,000)		(34,000)		(378,000)		(103,000)
Reclassifications from AOCI, Net of Income Tax (Expense) Credit	(235,000)		(64,000)
Gains and Losses on Available-for-Sale Securities
Income Tax (Expense) Credit	(125,000)		(34,000)		(378,000)		(103,000)
Reclassifications from AOCI, Net of Income Tax (Expense) Credit	(235,000)		(64,000)
Amortization of Pension and OPEB
Income Tax (Expense) Credit	(125,000)		(34,000)		(378,000)		(103,000)
Reclassifications from AOCI, Net of Income Tax (Expense) Credit	(235,000)		(64,000)
Reclassifications from AOCI, Net of Income Tax (Expense) Credit	(235,000)		(64,000)
Southwestern Electric Power Co [Member] | Reclassifications from Accumulated Other Comprehensive Income [Member] | Commodity [Member] | Cash Flow Hedges [Member]
Commodity:
Other Operation Expense	0		(12,000)		(13,000)		(28,000)
Maintenance Expense	0		(7,000)		(10,000)		(14,000)
Property, Plant and Equipment	0		(8,000)		(11,000)		(16,000)
Regulatory Assets/(Liabilities), Net					(67,000)	[1]	0	[1]
Southwestern Electric Power Co [Member] | Reclassifications from Accumulated Other Comprehensive Income [Member] | Interest Rate and Foreign Currency [Member] | Cash Flow Hedges [Member]
Interest Rate and Foreign Currency:
Interest Expense	872,000		872,000		2,616,000		2,616,000
Gains and Losses on Available-for-Sale Securities
Interest Expense	$ 872,000		$ 872,000		$ 2,616,000		$ 2,616,000

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