BUSINESS SEGMENTS - Schedule of AEP's Reportable Segment Information (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Revenues from:
Total Revenues	$ 19,721.3	$ 18,982.3	$ 19,639.5
Purchased Electricity, Fuel and Other Consumables Used for Electric Generation	5,936.3	6,578.3	7,097.9
Other Operation and Maintenance	4,452.7	4,086.8	4,127.5
Loss on the Expected Sale of the Kentucky Operations	0.0	0.0	363.3
Asset Impairments and Other Related Charges	142.5	85.6	48.8
Loss on the Sale of the Competitive Contracted Renewables Portfolio	0.0	92.7	0.0
Gain on the Sale of Mineral Rights	0.0	0.0	(116.3)
Depreciation and Amortization	3,289.9	3,090.4	3,202.8
Taxes Other Than Income Taxes	1,596.3	1,492.3	1,469.8
Allowance for Equity Funds Used During Construction	211.0	174.9	133.7
Interest Expense	1,862.8	1,806.9	1,396.1
Income Tax Expense (Benefit)	(39.2)	54.6	5.4
Equity Earnings (Loss) of Unconsolidated Subsidiaries	93.7	58.5	(109.4)
Other Segment Items	(182.4)	(280.0)	(238.7)
EARNINGS ATTRIBUTABLE TO COMMON SHAREHOLDERS, Basic	2,967.1	2,208.1	2,307.2
EARNINGS ATTRIBUTABLE TO COMMON SHAREHOLDERS, Diluted	2,967.1	2,208.1	2,307.2
Gross Property Additions	8,030.2	7,533.5	7,879.0
Total Assets	103,078.0	96,684.0
Investments in Equity Method Investees	1,055.9	1,073.6	1,276.7
Related Party
Revenues from:
Total Revenues	0.0	0.0	0.0
Operating Segments
Revenues from:
Total Revenues	21,500.5	20,523.5	21,133.4
Purchased Electricity, Fuel and Other Consumables Used for Electric Generation	6,247.7	6,852.9	7,279.5
Other Operation and Maintenance	5,986.8	5,433.4	5,435.8
Loss on the Expected Sale of the Kentucky Operations			0.0
Asset Impairments and Other Related Charges	142.5	85.6	24.9
Loss on the Sale of the Competitive Contracted Renewables Portfolio		92.7
Gain on the Sale of Mineral Rights			(116.3)
Depreciation and Amortization	3,310.7	3,106.4	3,201.9
Taxes Other Than Income Taxes	1,576.4	1,477.2	1,453.5
Allowance for Equity Funds Used During Construction	211.0	174.9	133.7
Interest Expense	1,368.7	1,406.7	1,200.0
Income Tax Expense (Benefit)	112.9	138.1	133.6
Equity Earnings (Loss) of Unconsolidated Subsidiaries	100.1	67.8	(107.0)
Other Segment Items	(192.4)	(292.5)	(297.6)
EARNINGS ATTRIBUTABLE TO COMMON SHAREHOLDERS, Basic	3,258.3	2,465.7	2,844.8
EARNINGS ATTRIBUTABLE TO COMMON SHAREHOLDERS, Diluted	3,258.3	2,465.7	2,844.8
Gross Property Additions	7,594.7	7,495.5	7,881.9
Total Assets	101,506.6	95,814.6
Investments in Equity Method Investees	1,007.2	1,019.4	1,209.0
Operating Segments | Nonrelated Party
Revenues from:
Total Revenues	19,663.3	18,921.6	19,588.8
Operating Segments | Related Party
Revenues from:
Total Revenues	1,837.2	1,601.9	1,544.6
Corporate and Other
Revenues from:
Total Revenues	183.1	168.0	109.9
Purchased Electricity, Fuel and Other Consumables Used for Electric Generation	0.0	0.0	0.0
Other Operation and Maintenance	136.3	103.1	130.0
Loss on the Expected Sale of the Kentucky Operations			363.3
Asset Impairments and Other Related Charges	0.0	0.0	23.9
Loss on the Sale of the Competitive Contracted Renewables Portfolio		0.0
Gain on the Sale of Mineral Rights			0.0
Depreciation and Amortization	(20.8)	(16.0)	0.9
Taxes Other Than Income Taxes	0.4	0.2	0.2
Allowance for Equity Funds Used During Construction	0.0	0.0	0.0
Interest Expense	612.5	594.7	308.9
Income Tax Expense (Benefit)	(152.1)	(83.5)	(128.2)
Equity Earnings (Loss) of Unconsolidated Subsidiaries	(6.4)	(9.3)	(2.4)
Other Segment Items	(108.4)	(182.2)	(53.9)
EARNINGS ATTRIBUTABLE TO COMMON SHAREHOLDERS, Basic	(291.2)	(257.6)	(537.6)
EARNINGS ATTRIBUTABLE TO COMMON SHAREHOLDERS, Diluted	(291.2)	(257.6)	(537.6)
Gross Property Additions	466.6	36.6	25.9
Total Assets	5,550.8	5,194.0
Investments in Equity Method Investees	48.7	54.2	67.7
Corporate and Other | Nonrelated Party
Revenues from:
Total Revenues	58.0	60.7	50.7
Corporate and Other | Related Party
Revenues from:
Total Revenues	125.1	107.3	59.2
Reconciling Adjustments
Revenues from:
Total Revenues	(1,962.3)	(1,709.2)	(1,603.8)
Purchased Electricity, Fuel and Other Consumables Used for Electric Generation	(311.4)	(274.6)	(181.6)
Other Operation and Maintenance	(1,670.4)	(1,449.7)	(1,438.3)
Loss on the Expected Sale of the Kentucky Operations			0.0
Asset Impairments and Other Related Charges	0.0	0.0	0.0
Loss on the Sale of the Competitive Contracted Renewables Portfolio		0.0
Gain on the Sale of Mineral Rights			0.0
Depreciation and Amortization	0.0	0.0	0.0
Taxes Other Than Income Taxes	19.5	14.9	16.1
Allowance for Equity Funds Used During Construction	0.0	0.0	0.0
Interest Expense	(118.4)	(194.5)	(112.8)
Income Tax Expense (Benefit)	0.0	0.0	0.0
Equity Earnings (Loss) of Unconsolidated Subsidiaries	0.0	0.0	0.0
Other Segment Items	118.4	194.7	112.8
EARNINGS ATTRIBUTABLE TO COMMON SHAREHOLDERS, Basic	0.0	0.0	0.0
EARNINGS ATTRIBUTABLE TO COMMON SHAREHOLDERS, Diluted	0.0	0.0	0.0
Gross Property Additions	(31.1)	1.4	(28.8)
Total Assets	(3,979.4)	(4,324.6)
Investments in Equity Method Investees	0.0	0.0	0.0
Reconciling Adjustments | Nonrelated Party
Revenues from:
Total Revenues	0.0	0.0	0.0
Reconciling Adjustments | Related Party
Revenues from:
Total Revenues	(1,962.3)	(1,709.2)	(1,603.8)
VIU | Operating Segments
Revenues from:
Total Revenues	11,596.6	11,449.5	11,477.5
Purchased Electricity, Fuel and Other Consumables Used for Electric Generation	3,796.2	4,150.3	4,007.9
Other Operation and Maintenance	3,528.0	3,211.1	3,287.2
Loss on the Expected Sale of the Kentucky Operations			0.0
Asset Impairments and Other Related Charges	13.4	85.6	24.9
Loss on the Sale of the Competitive Contracted Renewables Portfolio		0.0
Gain on the Sale of Mineral Rights			0.0
Depreciation and Amortization	1,970.6	1,876.4	2,007.2
Taxes Other Than Income Taxes	535.3	512.5	504.9
Allowance for Equity Funds Used During Construction	52.4	46.3	29.5
Interest Expense	724.3	764.5	650.9
Income Tax Expense (Benefit)	(282.2)	(45.2)	(93.8)
Equity Earnings (Loss) of Unconsolidated Subsidiaries	1.4	1.4	1.4
Other Segment Items	(88.4)	(148.4)	(172.8)
EARNINGS ATTRIBUTABLE TO COMMON SHAREHOLDERS, Basic	1,453.2	1,090.4	1,292.0
EARNINGS ATTRIBUTABLE TO COMMON SHAREHOLDERS, Diluted	1,453.2	1,090.4	1,292.0
Gross Property Additions	3,643.5	3,486.8	4,164.6
Total Assets	54,996.5	51,802.1
Investments in Equity Method Investees	9.1	10.0	10.1
VIU | Operating Segments | Nonrelated Party
Revenues from:
Total Revenues	11,414.0	11,303.7	11,292.8
VIU | Operating Segments | Related Party
Revenues from:
Total Revenues	182.6	145.8	184.7
T&D | Operating Segments
Revenues from:
Total Revenues	5,907.7	5,713.3	5,512.0
Purchased Electricity, Fuel and Other Consumables Used for Electric Generation	909.1	1,214.8	1,287.3
Other Operation and Maintenance	2,166.1	1,947.8	1,864.2
Loss on the Expected Sale of the Kentucky Operations			0.0
Asset Impairments and Other Related Charges	52.9	0.0	0.0
Loss on the Sale of the Competitive Contracted Renewables Portfolio		0.0
Gain on the Sale of Mineral Rights			0.0
Depreciation and Amortization	879.5	784.7	746.7
Taxes Other Than Income Taxes	724.2	668.0	659.9
Allowance for Equity Funds Used During Construction	69.2	45.5	33.6
Interest Expense	405.5	363.6	328.0
Income Tax Expense (Benefit)	154.5	140.2	116.9
Equity Earnings (Loss) of Unconsolidated Subsidiaries	(1.1)	0.0	0.6
Other Segment Items	(41.7)	(59.0)	(52.5)
EARNINGS ATTRIBUTABLE TO COMMON SHAREHOLDERS, Basic	725.7	698.7	595.7
EARNINGS ATTRIBUTABLE TO COMMON SHAREHOLDERS, Diluted	725.7	698.7	595.7
Gross Property Additions	2,343.6	2,467.4	2,177.3
Total Assets	26,864.3	24,838.4
Investments in Equity Method Investees	2.0	3.0	3.0
T&D | Operating Segments | Nonrelated Party
Revenues from:
Total Revenues	5,879.6	5,677.2	5,489.6
T&D | Operating Segments | Related Party
Revenues from:
Total Revenues	28.1	36.1	22.4
AEPTHCo | Operating Segments
Revenues from:
Total Revenues	1,950.8	1,728.5	1,677.0
Purchased Electricity, Fuel and Other Consumables Used for Electric Generation	0.0	0.0	0.0
Other Operation and Maintenance	162.8	141.6	165.7
Loss on the Expected Sale of the Kentucky Operations			0.0
Asset Impairments and Other Related Charges	0.0	0.0	0.0
Loss on the Sale of the Competitive Contracted Renewables Portfolio		0.0
Gain on the Sale of Mineral Rights			0.0
Depreciation and Amortization	439.7	402.6	355.0
Taxes Other Than Income Taxes	314.9	290.1	277.6
Allowance for Equity Funds Used During Construction	89.4	83.1	70.6
Interest Expense	222.3	202.6	169.3
Income Tax Expense (Benefit)	214.7	166.0	193.6
Equity Earnings (Loss) of Unconsolidated Subsidiaries	98.9	82.9	83.4
Other Segment Items	(5.5)	(11.3)	(3.7)
EARNINGS ATTRIBUTABLE TO COMMON SHAREHOLDERS, Basic	790.2	702.9	673.5
EARNINGS ATTRIBUTABLE TO COMMON SHAREHOLDERS, Diluted	790.2	702.9	673.5
Gross Property Additions	1,572.5	1,528.7	1,470.8
Total Assets	18,011.9	16,575.6
Investments in Equity Method Investees	996.1	905.8	858.3
AEPTHCo | Operating Segments | Nonrelated Party
Revenues from:
Total Revenues	425.0	397.4	357.5
AEPTHCo | Operating Segments | Related Party
Revenues from:
Total Revenues	1,525.8	1,331.1	1,319.5
G&M
Revenues from:
Loss on the Sale of the Competitive Contracted Renewables Portfolio		93.0
G&M | Operating Segments
Revenues from:
Total Revenues	2,045.4	1,632.2	2,466.9
Purchased Electricity, Fuel and Other Consumables Used for Electric Generation	1,542.4	1,487.8	1,984.3
Other Operation and Maintenance	129.9	132.9	118.7
Loss on the Expected Sale of the Kentucky Operations			0.0
Asset Impairments and Other Related Charges	76.2	0.0	0.0
Loss on the Sale of the Competitive Contracted Renewables Portfolio		92.7
Gain on the Sale of Mineral Rights			(116.3)
Depreciation and Amortization	20.9	42.7	93.0
Taxes Other Than Income Taxes	2.0	6.6	11.1
Allowance for Equity Funds Used During Construction	0.0	0.0	0.0
Interest Expense	16.6	76.0	51.8
Income Tax Expense (Benefit)	25.9	(122.9)	(83.1)
Equity Earnings (Loss) of Unconsolidated Subsidiaries	0.9	(16.5)	(192.4)
Other Segment Items	(56.8)	(73.8)	(68.6)
EARNINGS ATTRIBUTABLE TO COMMON SHAREHOLDERS, Basic	289.2	(26.3)	283.6
EARNINGS ATTRIBUTABLE TO COMMON SHAREHOLDERS, Diluted	289.2	(26.3)	283.6
Gross Property Additions	35.1	12.6	69.2
Total Assets	1,633.9	2,598.5
Investments in Equity Method Investees	0.0	100.6	337.6
G&M | Operating Segments | Nonrelated Party
Revenues from:
Total Revenues	1,944.7	1,543.3	2,448.9
G&M | Operating Segments | Related Party
Revenues from:
Total Revenues	$ 100.7	$ 88.9	$ 18.0