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BUSINESS SEGMENTS - Schedule of AEPTCo's Reportable Segment Information (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024	Dec. 31, 2024
Segment Reporting Information [Line Items]
Total Revenues	$ 6,010.4	$ 5,420.1	$ 16,560.7	$ 15,025.0
Other Operation and Maintenance	1,202.9	1,149.5	3,202.1	3,398.1
Depreciation and Amortization	879.6	852.7	2,566.1	2,461.7
Taxes Other Than Income Taxes	426.3	407.2	1,213.3	1,211.2
Allowance for Equity Funds Used During Construction	58.5	54.2	172.9	153.0
Interest Expense	508.5	498.8	1,492.9	1,400.0
Income Tax Expense (Benefit)	138.7	37.5	13.3	(97.7)
Other Segment Items	(18.2)	(72.9)	(46.7)	(177.3)
Earnings (Loss) Attributable to AEPTCo Common Shareholders, Basic	972.0	959.6	2,998.0	2,303.0
Earnings (Loss) Attributable to AEPTCo Common Shareholders, Diluted	972.0	959.6	2,998.0	2,303.0
Gross Property Additions	2,279.0	1,850.3	7,658.5	5,168.6
Total Assets	110,253.5		110,253.5		$ 103,078.0
Nonrelated Party
Segment Reporting Information [Line Items]
Total Revenues	6,010.4	5,420.1	16,560.7	15,025.0
Operating Segments
Segment Reporting Information [Line Items]
Total Revenues	6,560.9	5,890.0	18,302.4	16,401.2
Other Operation and Maintenance	1,710.4	1,541.3	4,806.3	4,576.4
Depreciation and Amortization	884.6	857.9	2,581.2	2,477.4
Taxes Other Than Income Taxes	420.0	401.7	1,194.8	1,196.0
Allowance for Equity Funds Used During Construction	58.5	54.2	172.9	153.0
Interest Expense	390.3	356.5	1,123.1	1,017.0
Income Tax Expense (Benefit)	109.1	22.6	84.3	(40.3)
Other Segment Items	(21.0)	(64.3)	(53.8)	(181.8)
Earnings (Loss) Attributable to AEPTCo Common Shareholders, Basic	1,090.0	1,124.7	3,212.8	2,590.5
Earnings (Loss) Attributable to AEPTCo Common Shareholders, Diluted	1,090.0	1,124.7	3,212.8	2,590.5
Gross Property Additions	2,285.6	1,858.0	7,627.1	5,174.6
Total Assets	108,254.3		108,254.3		101,506.6
Operating Segments | Nonrelated Party
Segment Reporting Information [Line Items]
Total Revenues	6,004.9	5,414.1	16,535.6	14,976.9
Corporate and Other
Segment Reporting Information [Line Items]
Total Revenues	35.9	38.1	110.1	148.6
Other Operation and Maintenance	8.1	53.6	44.4	114.6
Depreciation and Amortization	(5.0)	(5.2)	(15.1)	(15.7)
Taxes Other Than Income Taxes	0.2	0.1	0.8	0.3
Allowance for Equity Funds Used During Construction	0.0	0.0	0.0	0.0
Interest Expense	140.2	168.4	438.3	479.5
Income Tax Expense (Benefit)	29.6	14.9	(71.0)	(57.4)
Other Segment Items	(19.2)	(34.7)	(61.4)	(92.0)
Earnings (Loss) Attributable to AEPTCo Common Shareholders, Basic	(118.0)	(165.1)	(214.8)	(287.5)
Earnings (Loss) Attributable to AEPTCo Common Shareholders, Diluted	(118.0)	(165.1)	(214.8)	(287.5)
Gross Property Additions	18.5	7.4	54.3	16.9
Total Assets	6,172.3		6,172.3		5,550.8
Corporate and Other | Nonrelated Party
Segment Reporting Information [Line Items]
Total Revenues	5.5	6.0	25.1	48.1
Reconciling Adjustments
Segment Reporting Information [Line Items]
Total Revenues	(586.4)	(508.0)	(1,851.8)	(1,524.8)
Other Operation and Maintenance	(515.6)	(445.4)	(1,648.6)	(1,292.9)
Depreciation and Amortization	0.0	0.0	0.0	0.0
Taxes Other Than Income Taxes	6.1	5.4	17.7	14.9
Allowance for Equity Funds Used During Construction	0.0	0.0	0.0	0.0
Interest Expense	(22.0)	(26.1)	(68.5)	(96.5)
Income Tax Expense (Benefit)	0.0	0.0	0.0	0.0
Other Segment Items	22.0	26.1	68.5	96.5
Earnings (Loss) Attributable to AEPTCo Common Shareholders, Basic	0.0	0.0	0.0	0.0
Earnings (Loss) Attributable to AEPTCo Common Shareholders, Diluted	0.0	0.0	0.0	0.0
Gross Property Additions	(25.1)	(15.1)	(22.9)	(22.9)
Total Assets	(4,173.1)		(4,173.1)		(3,979.4)
Reconciling Adjustments | Nonrelated Party
Segment Reporting Information [Line Items]
Total Revenues	0.0	0.0	0.0	0.0
AEPTCo
Segment Reporting Information [Line Items]
Total Revenues	558.0	497.2	1,826.9	1,455.2
Other Revenues		0.2	0.1	3.0
Other Operation and Maintenance	49.9	37.4	126.5	117.6
Depreciation and Amortization	121.3	108.2	354.3	320.8
Taxes Other Than Income Taxes	85.9	79.7	235.8	228.6
Interest Income	1.3	3.1	3.1	9.3
Allowance for Equity Funds Used During Construction	20.8	24.3	64.7	64.7
Interest Expense	61.3	54.3	172.9	160.5
Income Tax Expense (Benefit)	56.2	53.7	(28.3)	153.5
Other Segment Items	26.6		87.3
Earnings (Loss) Attributable to AEPTCo Common Shareholders, Basic	178.9	191.3	946.2	548.2
Earnings (Loss) Attributable to AEPTCo Common Shareholders, Diluted	178.9	191.3	946.2	548.2
Gross Property Additions	357.8	385.1	1,144.7	1,042.9
Total Assets	17,208.6		17,208.6		16,370.3
AEPTCo | Nonrelated Party
Segment Reporting Information [Line Items]
Total Revenues	107.9	101.1	356.8	295.1
AEPTCo | Affiliated Entity
Segment Reporting Information [Line Items]
Total Revenues	450.1	395.9	1,470.0	1,157.1
AEPTCo | Corporate and Other
Segment Reporting Information [Line Items]
Total Revenues	0.0	0.0	0.0	0.0
Other Revenues		0.0	0.0	0.0
Other Operation and Maintenance	0.1	0.1	0.3	1.7
Depreciation and Amortization	0.0	0.0	0.0	0.0
Taxes Other Than Income Taxes	0.0	0.0	0.0	0.0
Interest Income	65.5	61.7	238.8	180.5
Allowance for Equity Funds Used During Construction	0.0	0.0	0.0	0.0
Interest Expense	65.1	61.0	187.7	178.2
Income Tax Expense (Benefit)	0.1	0.1	10.8	0.1
Other Segment Items	26.6		87.3
Earnings (Loss) Attributable to AEPTCo Common Shareholders, Basic	(26.4)	0.5	(47.3)	0.5
Earnings (Loss) Attributable to AEPTCo Common Shareholders, Diluted	(26.4)	0.5	(47.3)	0.5
Gross Property Additions	0.0	0.0	0.0	0.0
Total Assets	6,396.4		6,396.4		8,670.4
AEPTCo | Corporate and Other | Nonrelated Party
Segment Reporting Information [Line Items]
Total Revenues	0.0	0.0	0.0	0.0
AEPTCo | Corporate and Other | Affiliated Entity
Segment Reporting Information [Line Items]
Total Revenues	0.0	0.0	0.0	0.0
AEPTCo | Reconciling Adjustments
Segment Reporting Information [Line Items]
Total Revenues	0.0	0.0	0.0	0.0
Other Revenues		0.0	0.0	0.0
Other Operation and Maintenance	0.0	0.0	0.0	0.0
Depreciation and Amortization	0.0	0.0	0.0	0.0
Taxes Other Than Income Taxes	0.0	0.0	0.0	0.0
Interest Income	(65.0)	(60.9)	(237.5)	(178.0)
Allowance for Equity Funds Used During Construction	0.0	0.0	0.0	0.0
Interest Expense	(65.0)	(60.9)	(237.5)	(178.0)
Income Tax Expense (Benefit)	0.0	0.0	0.0	0.0
Other Segment Items	0.0		0.0
Earnings (Loss) Attributable to AEPTCo Common Shareholders, Basic	0.0	0.0	0.0	0.0
Earnings (Loss) Attributable to AEPTCo Common Shareholders, Diluted	0.0	0.0	0.0	0.0
Gross Property Additions	0.0	0.0	0.0	0.0
Total Assets	(6,410.0)		(6,410.0)		(9,187.8)
AEPTCo | Reconciling Adjustments | Nonrelated Party
Segment Reporting Information [Line Items]
Total Revenues	0.0	0.0	0.0	0.0
AEPTCo | Reconciling Adjustments | Affiliated Entity
Segment Reporting Information [Line Items]
Total Revenues	0.0	0.0	0.0	0.0
State Transcos | AEPTCo | Operating Segments
Segment Reporting Information [Line Items]
Total Revenues	558.0	497.2	1,826.9	1,455.2
Other Revenues		0.2	0.1	3.0
Other Operation and Maintenance	49.8	37.3	126.2	115.9
Depreciation and Amortization	121.3	108.2	354.3	320.8
Taxes Other Than Income Taxes	85.9	79.7	235.8	228.6
Interest Income	0.8	2.3	1.8	6.8
Allowance for Equity Funds Used During Construction	20.8	24.3	64.7	64.7
Interest Expense	61.2	54.2	222.7	160.3
Income Tax Expense (Benefit)	56.1	53.6	(39.1)	153.4
Other Segment Items	0.0		0.0
Earnings (Loss) Attributable to AEPTCo Common Shareholders, Basic	205.3	190.8	993.5	547.7
Earnings (Loss) Attributable to AEPTCo Common Shareholders, Diluted	205.3	190.8	993.5	547.7
Gross Property Additions	357.8	385.1	1,144.7	1,042.9
Total Assets	17,222.2		17,222.2		$ 16,887.7
State Transcos | AEPTCo | Operating Segments | Nonrelated Party
Segment Reporting Information [Line Items]
Total Revenues	107.9	101.1	356.8	295.1
State Transcos | AEPTCo | Operating Segments | Affiliated Entity
Segment Reporting Information [Line Items]
Total Revenues	$ 450.1	$ 395.9	$ 1,470.0	$ 1,157.1

X

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Amount of asset recognized for present right to economic benefit.

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