REVENUE FROM CONTRACTS WITH CUSTOMERS - Disaggregation of Revenue (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Disaggregation of Revenue [Line Items]
Total Revenues from Contracts with Customers	$ 5,921	$ 5,631
Total Revenues	6,020	5,463
Related Party
Disaggregation of Revenue [Line Items]
Total Revenues	0	0
Total Retail Revenues
Disaggregation of Revenue [Line Items]
Total Revenues from Contracts with Customers	4,156	3,948
Residential Revenues
Disaggregation of Revenue [Line Items]
Total Revenues from Contracts with Customers	2,097	2,091
Commercial Revenues
Disaggregation of Revenue [Line Items]
Total Revenues from Contracts with Customers	1,208	1,047
Industrial Revenues
Disaggregation of Revenue [Line Items]
Total Revenues from Contracts with Customers	777	741
Other Retail Revenues
Disaggregation of Revenue [Line Items]
Total Revenues from Contracts with Customers	74	69
Total Wholesale and Competitive Retail Revenues
Disaggregation of Revenue [Line Items]
Total Revenues from Contracts with Customers	1,607	1,567
Generation Revenues
Disaggregation of Revenue [Line Items]
Total Revenues from Contracts with Customers	414	356
Transmission Revenues
Disaggregation of Revenue [Line Items]
Total Revenues from Contracts with Customers	444	389
Retail, Trading and Marketing Revenues
Disaggregation of Revenue [Line Items]
Total Revenues from Contracts with Customers	749	822
Other Revenues
Disaggregation of Revenue [Line Items]
Total Revenues from Contracts with Customers	158	116
Total Revenues	130	132
Total Other Revenues
Disaggregation of Revenue [Line Items]
Total Other Revenues	99	(168)
Alternative Revenue Programs
Disaggregation of Revenue [Line Items]
Total Other Revenues	(3)	4
Other Revenues
Disaggregation of Revenue [Line Items]
Total Other Revenues	102	(172)
AEP TEXAS INC.
Disaggregation of Revenue [Line Items]
Total Revenues from Contracts with Customers	526	525
Total Revenues	524	523
AEP TEXAS INC. | Total Retail Revenues
Disaggregation of Revenue [Line Items]
Total Revenues from Contracts with Customers	320	342
AEP TEXAS INC. | Residential Revenues
Disaggregation of Revenue [Line Items]
Total Revenues from Contracts with Customers	158	172
AEP TEXAS INC. | Commercial Revenues
Disaggregation of Revenue [Line Items]
Total Revenues from Contracts with Customers	114	119
AEP TEXAS INC. | Industrial Revenues
Disaggregation of Revenue [Line Items]
Total Revenues from Contracts with Customers	37	40
AEP TEXAS INC. | Other Retail Revenues
Disaggregation of Revenue [Line Items]
Total Revenues from Contracts with Customers	11	11
AEP TEXAS INC. | Total Wholesale and Competitive Retail Revenues
Disaggregation of Revenue [Line Items]
Total Revenues from Contracts with Customers	186	173
AEP TEXAS INC. | Generation Revenues
Disaggregation of Revenue [Line Items]
Total Revenues from Contracts with Customers	0	0
AEP TEXAS INC. | Transmission Revenues
Disaggregation of Revenue [Line Items]
Total Revenues from Contracts with Customers	186	173
AEP TEXAS INC. | Other Revenues
Disaggregation of Revenue [Line Items]
Total Revenues from Contracts with Customers	20	10
Total Revenues	9	2
AEP TEXAS INC. | Total Other Revenues
Disaggregation of Revenue [Line Items]
Total Other Revenues	(2)	(2)
AEP TEXAS INC. | Alternative Revenue Programs
Disaggregation of Revenue [Line Items]
Total Other Revenues	(2)	(2)
AEP TEXAS INC. | Other Revenues
Disaggregation of Revenue [Line Items]
Total Other Revenues	0	0
AEP TRANSMISSION COMPANY, LLC
Disaggregation of Revenue [Line Items]
Total Revenues from Contracts with Customers	570	515
Total Revenues	578	527
AEP TRANSMISSION COMPANY, LLC | Total Retail Revenues
Disaggregation of Revenue [Line Items]
Total Revenues from Contracts with Customers	0	0
AEP TRANSMISSION COMPANY, LLC | Residential Revenues
Disaggregation of Revenue [Line Items]
Total Revenues from Contracts with Customers	0	0
AEP TRANSMISSION COMPANY, LLC | Commercial Revenues
Disaggregation of Revenue [Line Items]
Total Revenues from Contracts with Customers	0	0
AEP TRANSMISSION COMPANY, LLC | Industrial Revenues
Disaggregation of Revenue [Line Items]
Total Revenues from Contracts with Customers	0	0
AEP TRANSMISSION COMPANY, LLC | Other Retail Revenues
Disaggregation of Revenue [Line Items]
Total Revenues from Contracts with Customers	0	0
AEP TRANSMISSION COMPANY, LLC | Total Wholesale and Competitive Retail Revenues
Disaggregation of Revenue [Line Items]
Total Revenues from Contracts with Customers	564	506
AEP TRANSMISSION COMPANY, LLC | Generation Revenues
Disaggregation of Revenue [Line Items]
Total Revenues from Contracts with Customers	0	0
AEP TRANSMISSION COMPANY, LLC | Transmission Revenues
Disaggregation of Revenue [Line Items]
Total Revenues from Contracts with Customers	564	506
AEP TRANSMISSION COMPANY, LLC | Transmission Revenues | Related Party
Disaggregation of Revenue [Line Items]
Total Revenues from Contracts with Customers	454	407
AEP TRANSMISSION COMPANY, LLC | Other Revenues
Disaggregation of Revenue [Line Items]
Total Revenues from Contracts with Customers	6	9
AEP TRANSMISSION COMPANY, LLC | Total Other Revenues
Disaggregation of Revenue [Line Items]
Total Other Revenues	8	12
AEP TRANSMISSION COMPANY, LLC | Alternative Revenue Programs
Disaggregation of Revenue [Line Items]
Total Other Revenues	8	12
AEP TRANSMISSION COMPANY, LLC | Other Revenues
Disaggregation of Revenue [Line Items]
Total Other Revenues	0	0
APPALACHIAN POWER COMPANY
Disaggregation of Revenue [Line Items]
Total Revenues from Contracts with Customers	1,166	1,166
Total Revenues	1,167	1,173
APPALACHIAN POWER COMPANY | Total Retail Revenues
Disaggregation of Revenue [Line Items]
Total Revenues from Contracts with Customers	994	1,020
APPALACHIAN POWER COMPANY | Residential Revenues
Disaggregation of Revenue [Line Items]
Total Revenues from Contracts with Customers	589	606
APPALACHIAN POWER COMPANY | Commercial Revenues
Disaggregation of Revenue [Line Items]
Total Revenues from Contracts with Customers	193	195
APPALACHIAN POWER COMPANY | Industrial Revenues
Disaggregation of Revenue [Line Items]
Total Revenues from Contracts with Customers	186	191
APPALACHIAN POWER COMPANY | Other Retail Revenues
Disaggregation of Revenue [Line Items]
Total Revenues from Contracts with Customers	26	28
APPALACHIAN POWER COMPANY | Total Wholesale and Competitive Retail Revenues
Disaggregation of Revenue [Line Items]
Total Revenues from Contracts with Customers	155	132
APPALACHIAN POWER COMPANY | Generation Revenues
Disaggregation of Revenue [Line Items]
Total Revenues from Contracts with Customers	94	90
APPALACHIAN POWER COMPANY | Generation Revenues | Related Party
Disaggregation of Revenue [Line Items]
Total Revenues from Contracts with Customers		45
APPALACHIAN POWER COMPANY | Generation Revenues | Related Party
Disaggregation of Revenue [Line Items]
Total Revenues from Contracts with Customers	55
APPALACHIAN POWER COMPANY | Transmission Revenues
Disaggregation of Revenue [Line Items]
Total Revenues from Contracts with Customers	61	42
APPALACHIAN POWER COMPANY | Transmission Revenues | Related Party
Disaggregation of Revenue [Line Items]
Total Revenues from Contracts with Customers	33	19
APPALACHIAN POWER COMPANY | Other Revenues
Disaggregation of Revenue [Line Items]
Total Revenues from Contracts with Customers	17	14
Total Revenues	4	3
APPALACHIAN POWER COMPANY | Total Other Revenues
Disaggregation of Revenue [Line Items]
Total Other Revenues	1	7
APPALACHIAN POWER COMPANY | Alternative Revenue Programs
Disaggregation of Revenue [Line Items]
Total Other Revenues	1	7
APPALACHIAN POWER COMPANY | Other Revenues
Disaggregation of Revenue [Line Items]
Total Other Revenues	0	0
INDIANA MICHIGAN POWER COMPANY
Disaggregation of Revenue [Line Items]
Total Revenues from Contracts with Customers	937	755
Total Revenues	933	723
INDIANA MICHIGAN POWER COMPANY | Total Retail Revenues
Disaggregation of Revenue [Line Items]
Total Revenues from Contracts with Customers	641	520
INDIANA MICHIGAN POWER COMPANY | Residential Revenues
Disaggregation of Revenue [Line Items]
Total Revenues from Contracts with Customers	243	232
INDIANA MICHIGAN POWER COMPANY | Commercial Revenues
Disaggregation of Revenue [Line Items]
Total Revenues from Contracts with Customers	251	153
INDIANA MICHIGAN POWER COMPANY | Industrial Revenues
Disaggregation of Revenue [Line Items]
Total Revenues from Contracts with Customers	146	134
INDIANA MICHIGAN POWER COMPANY | Other Retail Revenues
Disaggregation of Revenue [Line Items]
Total Revenues from Contracts with Customers	1	1
INDIANA MICHIGAN POWER COMPANY | Total Wholesale and Competitive Retail Revenues
Disaggregation of Revenue [Line Items]
Total Revenues from Contracts with Customers	268	205
INDIANA MICHIGAN POWER COMPANY | Generation Revenues
Disaggregation of Revenue [Line Items]
Total Revenues from Contracts with Customers	257	195
INDIANA MICHIGAN POWER COMPANY | Transmission Revenues
Disaggregation of Revenue [Line Items]
Total Revenues from Contracts with Customers	11	10
INDIANA MICHIGAN POWER COMPANY | Other Revenues
Disaggregation of Revenue [Line Items]
Total Revenues from Contracts with Customers	28	30
INDIANA MICHIGAN POWER COMPANY | Other Revenues | Related Party
Disaggregation of Revenue [Line Items]
Total Revenues from Contracts with Customers		18
INDIANA MICHIGAN POWER COMPANY | Other Revenues | Related Party
Disaggregation of Revenue [Line Items]
Total Revenues from Contracts with Customers	17
INDIANA MICHIGAN POWER COMPANY | Total Other Revenues
Disaggregation of Revenue [Line Items]
Total Other Revenues	(4)	(32)
INDIANA MICHIGAN POWER COMPANY | Alternative Revenue Programs
Disaggregation of Revenue [Line Items]
Total Other Revenues	2	0
INDIANA MICHIGAN POWER COMPANY | Other Revenues
Disaggregation of Revenue [Line Items]
Total Other Revenues	(6)	(32)
OHIO POWER COMPANY
Disaggregation of Revenue [Line Items]
Total Revenues from Contracts with Customers	1,075	994
Total Revenues	1,085	1,004
OHIO POWER COMPANY | Total Retail Revenues
Disaggregation of Revenue [Line Items]
Total Revenues from Contracts with Customers	965	918
OHIO POWER COMPANY | Residential Revenues
Disaggregation of Revenue [Line Items]
Total Revenues from Contracts with Customers	575	567
OHIO POWER COMPANY | Commercial Revenues
Disaggregation of Revenue [Line Items]
Total Revenues from Contracts with Customers	295	262
OHIO POWER COMPANY | Industrial Revenues
Disaggregation of Revenue [Line Items]
Total Revenues from Contracts with Customers	91	84
OHIO POWER COMPANY | Other Retail Revenues
Disaggregation of Revenue [Line Items]
Total Revenues from Contracts with Customers	4	5
OHIO POWER COMPANY | Total Wholesale and Competitive Retail Revenues
Disaggregation of Revenue [Line Items]
Total Revenues from Contracts with Customers	28	24
OHIO POWER COMPANY | Generation Revenues
Disaggregation of Revenue [Line Items]
Total Revenues from Contracts with Customers	0	0
OHIO POWER COMPANY | Transmission Revenues
Disaggregation of Revenue [Line Items]
Total Revenues from Contracts with Customers	28	24
OHIO POWER COMPANY | Other Revenues
Disaggregation of Revenue [Line Items]
Total Revenues from Contracts with Customers	82	52
Total Revenues	3	4
OHIO POWER COMPANY | Total Other Revenues
Disaggregation of Revenue [Line Items]
Total Other Revenues	10	10
OHIO POWER COMPANY | Alternative Revenue Programs
Disaggregation of Revenue [Line Items]
Total Other Revenues	0	5
OHIO POWER COMPANY | Other Revenues
Disaggregation of Revenue [Line Items]
Total Other Revenues	10	5
PUBLIC SERVICE COMPANY OF OKLAHOMA
Disaggregation of Revenue [Line Items]
Total Revenues from Contracts with Customers	439	394
Total Revenues	439	394
PUBLIC SERVICE COMPANY OF OKLAHOMA | Total Retail Revenues
Disaggregation of Revenue [Line Items]
Total Revenues from Contracts with Customers	421	367
PUBLIC SERVICE COMPANY OF OKLAHOMA | Residential Revenues
Disaggregation of Revenue [Line Items]
Total Revenues from Contracts with Customers	186	175
PUBLIC SERVICE COMPANY OF OKLAHOMA | Commercial Revenues
Disaggregation of Revenue [Line Items]
Total Revenues from Contracts with Customers	122	102
PUBLIC SERVICE COMPANY OF OKLAHOMA | Industrial Revenues
Disaggregation of Revenue [Line Items]
Total Revenues from Contracts with Customers	89	70
PUBLIC SERVICE COMPANY OF OKLAHOMA | Other Retail Revenues
Disaggregation of Revenue [Line Items]
Total Revenues from Contracts with Customers	24	20
PUBLIC SERVICE COMPANY OF OKLAHOMA | Total Wholesale and Competitive Retail Revenues
Disaggregation of Revenue [Line Items]
Total Revenues from Contracts with Customers	15	18
PUBLIC SERVICE COMPANY OF OKLAHOMA | Generation Revenues
Disaggregation of Revenue [Line Items]
Total Revenues from Contracts with Customers	1	4
PUBLIC SERVICE COMPANY OF OKLAHOMA | Transmission Revenues
Disaggregation of Revenue [Line Items]
Total Revenues from Contracts with Customers	14	14
PUBLIC SERVICE COMPANY OF OKLAHOMA | Other Revenues
Disaggregation of Revenue [Line Items]
Total Revenues from Contracts with Customers	3	9
Total Revenues	1	3
PUBLIC SERVICE COMPANY OF OKLAHOMA | Total Other Revenues
Disaggregation of Revenue [Line Items]
Total Other Revenues	0	0
PUBLIC SERVICE COMPANY OF OKLAHOMA | Alternative Revenue Programs
Disaggregation of Revenue [Line Items]
Total Other Revenues	0	0
PUBLIC SERVICE COMPANY OF OKLAHOMA | Other Revenues
Disaggregation of Revenue [Line Items]
Total Other Revenues	0	0
SOUTHWESTERN ELECTRIC POWER COMPANY
Disaggregation of Revenue [Line Items]
Total Revenues from Contracts with Customers	571	531
Total Revenues	571	531
SOUTHWESTERN ELECTRIC POWER COMPANY | Total Retail Revenues
Disaggregation of Revenue [Line Items]
Total Revenues from Contracts with Customers	453	427
SOUTHWESTERN ELECTRIC POWER COMPANY | Residential Revenues
Disaggregation of Revenue [Line Items]
Total Revenues from Contracts with Customers	198	193
SOUTHWESTERN ELECTRIC POWER COMPANY | Commercial Revenues
Disaggregation of Revenue [Line Items]
Total Revenues from Contracts with Customers	158	141
SOUTHWESTERN ELECTRIC POWER COMPANY | Industrial Revenues
Disaggregation of Revenue [Line Items]
Total Revenues from Contracts with Customers	92	90
SOUTHWESTERN ELECTRIC POWER COMPANY | Other Retail Revenues
Disaggregation of Revenue [Line Items]
Total Revenues from Contracts with Customers	5	3
SOUTHWESTERN ELECTRIC POWER COMPANY | Total Wholesale and Competitive Retail Revenues
Disaggregation of Revenue [Line Items]
Total Revenues from Contracts with Customers	110	95
SOUTHWESTERN ELECTRIC POWER COMPANY | Generation Revenues
Disaggregation of Revenue [Line Items]
Total Revenues from Contracts with Customers	52	56
SOUTHWESTERN ELECTRIC POWER COMPANY | Transmission Revenues
Disaggregation of Revenue [Line Items]
Total Revenues from Contracts with Customers	58	39
SOUTHWESTERN ELECTRIC POWER COMPANY | Transmission Revenues | Related Party
Disaggregation of Revenue [Line Items]
Total Revenues from Contracts with Customers	20	10
SOUTHWESTERN ELECTRIC POWER COMPANY | Other Revenues
Disaggregation of Revenue [Line Items]
Total Revenues from Contracts with Customers	8	9
Total Revenues	1	3
SOUTHWESTERN ELECTRIC POWER COMPANY | Total Other Revenues
Disaggregation of Revenue [Line Items]
Total Other Revenues	0	0
SOUTHWESTERN ELECTRIC POWER COMPANY | Alternative Revenue Programs
Disaggregation of Revenue [Line Items]
Total Other Revenues	0	0
SOUTHWESTERN ELECTRIC POWER COMPANY | Other Revenues
Disaggregation of Revenue [Line Items]
Total Other Revenues	0	0
Operating Segments
Disaggregation of Revenue [Line Items]
Total Revenues	6,599	5,954
Operating Segments | Related Party
Disaggregation of Revenue [Line Items]
Total Revenues	582	507
Corporate and Other
Disaggregation of Revenue [Line Items]
Total Revenues from Contracts with Customers	29	43
Total Revenues	31	44
Corporate and Other | Related Party
Disaggregation of Revenue [Line Items]
Total Revenues	28	28
Corporate and Other | Total Retail Revenues
Disaggregation of Revenue [Line Items]
Total Revenues from Contracts with Customers	0	0
Corporate and Other | Residential Revenues
Disaggregation of Revenue [Line Items]
Total Revenues from Contracts with Customers	0	0
Corporate and Other | Commercial Revenues
Disaggregation of Revenue [Line Items]
Total Revenues from Contracts with Customers	0	0
Corporate and Other | Industrial Revenues
Disaggregation of Revenue [Line Items]
Total Revenues from Contracts with Customers	0	0
Corporate and Other | Other Retail Revenues
Disaggregation of Revenue [Line Items]
Total Revenues from Contracts with Customers	0	0
Corporate and Other | Total Wholesale and Competitive Retail Revenues
Disaggregation of Revenue [Line Items]
Total Revenues from Contracts with Customers	0	0
Corporate and Other | Generation Revenues
Disaggregation of Revenue [Line Items]
Total Revenues from Contracts with Customers	0	0
Corporate and Other | Transmission Revenues
Disaggregation of Revenue [Line Items]
Total Revenues from Contracts with Customers	0	0
Corporate and Other | Retail, Trading and Marketing Revenues
Disaggregation of Revenue [Line Items]
Total Revenues from Contracts with Customers	0	0
Corporate and Other | Other Revenues
Disaggregation of Revenue [Line Items]
Total Revenues from Contracts with Customers	29	43
Corporate and Other | Other Revenues | Related Party
Disaggregation of Revenue [Line Items]
Total Revenues from Contracts with Customers	29	29
Corporate and Other | Total Other Revenues
Disaggregation of Revenue [Line Items]
Total Other Revenues	2	1
Corporate and Other | Alternative Revenue Programs
Disaggregation of Revenue [Line Items]
Total Other Revenues	0	0
Corporate and Other | Other Revenues
Disaggregation of Revenue [Line Items]
Total Other Revenues	2	1
Corporate and Other | AEP TRANSMISSION COMPANY, LLC
Disaggregation of Revenue [Line Items]
Total Revenues	0	0
Reconciling Adjustments
Disaggregation of Revenue [Line Items]
Total Revenues from Contracts with Customers	(597)	(517)
Total Revenues	(610)	(535)
Reconciling Adjustments | Related Party
Disaggregation of Revenue [Line Items]
Total Revenues	(610)	(535)
Reconciling Adjustments | Total Retail Revenues
Disaggregation of Revenue [Line Items]
Total Revenues from Contracts with Customers	0	0
Reconciling Adjustments | Residential Revenues
Disaggregation of Revenue [Line Items]
Total Revenues from Contracts with Customers	0	0
Reconciling Adjustments | Commercial Revenues
Disaggregation of Revenue [Line Items]
Total Revenues from Contracts with Customers	0	0
Reconciling Adjustments | Industrial Revenues
Disaggregation of Revenue [Line Items]
Total Revenues from Contracts with Customers	0	0
Reconciling Adjustments | Other Retail Revenues
Disaggregation of Revenue [Line Items]
Total Revenues from Contracts with Customers	0	0
Reconciling Adjustments | Total Wholesale and Competitive Retail Revenues
Disaggregation of Revenue [Line Items]
Total Revenues from Contracts with Customers	(540)	(466)
Reconciling Adjustments | Generation Revenues
Disaggregation of Revenue [Line Items]
Total Revenues from Contracts with Customers	0	0
Reconciling Adjustments | Transmission Revenues
Disaggregation of Revenue [Line Items]
Total Revenues from Contracts with Customers	(519)	(450)
Reconciling Adjustments | Retail, Trading and Marketing Revenues
Disaggregation of Revenue [Line Items]
Total Revenues from Contracts with Customers	(21)	(16)
Reconciling Adjustments | Other Revenues
Disaggregation of Revenue [Line Items]
Total Revenues from Contracts with Customers	(57)	(51)
Reconciling Adjustments | Total Other Revenues
Disaggregation of Revenue [Line Items]
Total Other Revenues	(13)	(18)
Reconciling Adjustments | Alternative Revenue Programs
Disaggregation of Revenue [Line Items]
Total Other Revenues	(11)	(15)
Reconciling Adjustments | Other Revenues
Disaggregation of Revenue [Line Items]
Total Other Revenues	(2)	(3)
Reconciling Adjustments | AEP TRANSMISSION COMPANY, LLC
Disaggregation of Revenue [Line Items]
Total Revenues	0	0
VIU | Transmission Revenues | Related Party
Disaggregation of Revenue [Line Items]
Total Revenues from Contracts with Customers	55	39
VIU | Operating Segments
Disaggregation of Revenue [Line Items]
Total Revenues from Contracts with Customers	3,444	3,167
Total Revenues	3,440	3,138
VIU | Operating Segments | Related Party
Disaggregation of Revenue [Line Items]
Total Revenues	75	52
VIU | Operating Segments | Total Retail Revenues
Disaggregation of Revenue [Line Items]
Total Revenues from Contracts with Customers	2,871	2,689
VIU | Operating Segments | Residential Revenues
Disaggregation of Revenue [Line Items]
Total Revenues from Contracts with Customers	1,364	1,352
VIU | Operating Segments | Commercial Revenues
Disaggregation of Revenue [Line Items]
Total Revenues from Contracts with Customers	799	665
VIU | Operating Segments | Industrial Revenues
Disaggregation of Revenue [Line Items]
Total Revenues from Contracts with Customers	649	618
VIU | Operating Segments | Other Retail Revenues
Disaggregation of Revenue [Line Items]
Total Revenues from Contracts with Customers	59	54
VIU | Operating Segments | Total Wholesale and Competitive Retail Revenues
Disaggregation of Revenue [Line Items]
Total Revenues from Contracts with Customers	525	426
VIU | Operating Segments | Generation Revenues
Disaggregation of Revenue [Line Items]
Total Revenues from Contracts with Customers	362	305
VIU | Operating Segments | Transmission Revenues
Disaggregation of Revenue [Line Items]
Total Revenues from Contracts with Customers	163	121
VIU | Operating Segments | Retail, Trading and Marketing Revenues
Disaggregation of Revenue [Line Items]
Total Revenues from Contracts with Customers	0	0
VIU | Operating Segments | Other Revenues
Disaggregation of Revenue [Line Items]
Total Revenues from Contracts with Customers	48	52
VIU | Operating Segments | Total Other Revenues
Disaggregation of Revenue [Line Items]
Total Other Revenues	(4)	(29)
VIU | Operating Segments | Alternative Revenue Programs
Disaggregation of Revenue [Line Items]
Total Other Revenues	3	3
VIU | Operating Segments | Other Revenues
Disaggregation of Revenue [Line Items]
Total Other Revenues	(7)	(32)
T&D | Operating Segments
Disaggregation of Revenue [Line Items]
Total Revenues from Contracts with Customers	1,601	1,518
Total Revenues	1,609	1,527
T&D | Operating Segments | Related Party
Disaggregation of Revenue [Line Items]
Total Revenues	15	12
T&D | Operating Segments | Total Retail Revenues
Disaggregation of Revenue [Line Items]
Total Revenues from Contracts with Customers	1,285	1,259
T&D | Operating Segments | Residential Revenues
Disaggregation of Revenue [Line Items]
Total Revenues from Contracts with Customers	733	739
T&D | Operating Segments | Commercial Revenues
Disaggregation of Revenue [Line Items]
Total Revenues from Contracts with Customers	409	382
T&D | Operating Segments | Industrial Revenues
Disaggregation of Revenue [Line Items]
Total Revenues from Contracts with Customers	128	123
T&D | Operating Segments | Other Retail Revenues
Disaggregation of Revenue [Line Items]
Total Revenues from Contracts with Customers	15	15
T&D | Operating Segments | Total Wholesale and Competitive Retail Revenues
Disaggregation of Revenue [Line Items]
Total Revenues from Contracts with Customers	214	197
T&D | Operating Segments | Generation Revenues
Disaggregation of Revenue [Line Items]
Total Revenues from Contracts with Customers	0	0
T&D | Operating Segments | Transmission Revenues
Disaggregation of Revenue [Line Items]
Total Revenues from Contracts with Customers	214	197
T&D | Operating Segments | Retail, Trading and Marketing Revenues
Disaggregation of Revenue [Line Items]
Total Revenues from Contracts with Customers	0	0
T&D | Operating Segments | Other Revenues
Disaggregation of Revenue [Line Items]
Total Revenues from Contracts with Customers	102	62
T&D | Operating Segments | Total Other Revenues
Disaggregation of Revenue [Line Items]
Total Other Revenues	8	9
T&D | Operating Segments | Alternative Revenue Programs
Disaggregation of Revenue [Line Items]
Total Other Revenues	(2)	4
T&D | Operating Segments | Other Revenues
Disaggregation of Revenue [Line Items]
Total Other Revenues	10	5
AEPTHCo | Transmission Revenues | Related Party
Disaggregation of Revenue [Line Items]
Total Revenues from Contracts with Customers	458	411
AEPTHCo | Operating Segments
Disaggregation of Revenue [Line Items]
Total Revenues from Contracts with Customers	591	530
Total Revenues	598	542
AEPTHCo | Operating Segments | Total Retail Revenues
Disaggregation of Revenue [Line Items]
Total Revenues from Contracts with Customers	0	0
AEPTHCo | Operating Segments | Residential Revenues
Disaggregation of Revenue [Line Items]
Total Revenues from Contracts with Customers	0	0
AEPTHCo | Operating Segments | Commercial Revenues
Disaggregation of Revenue [Line Items]
Total Revenues from Contracts with Customers	0	0
AEPTHCo | Operating Segments | Industrial Revenues
Disaggregation of Revenue [Line Items]
Total Revenues from Contracts with Customers	0	0
AEPTHCo | Operating Segments | Other Retail Revenues
Disaggregation of Revenue [Line Items]
Total Revenues from Contracts with Customers	0	0
AEPTHCo | Operating Segments | Total Wholesale and Competitive Retail Revenues
Disaggregation of Revenue [Line Items]
Total Revenues from Contracts with Customers	586	521
AEPTHCo | Operating Segments | Generation Revenues
Disaggregation of Revenue [Line Items]
Total Revenues from Contracts with Customers	0	0
AEPTHCo | Operating Segments | Transmission Revenues
Disaggregation of Revenue [Line Items]
Total Revenues from Contracts with Customers	586	521
AEPTHCo | Operating Segments | Retail, Trading and Marketing Revenues
Disaggregation of Revenue [Line Items]
Total Revenues from Contracts with Customers	0	0
AEPTHCo | Operating Segments | Other Revenues
Disaggregation of Revenue [Line Items]
Total Revenues from Contracts with Customers	5	9
AEPTHCo | Operating Segments | Total Other Revenues
Disaggregation of Revenue [Line Items]
Total Other Revenues	7	12
AEPTHCo | Operating Segments | Alternative Revenue Programs
Disaggregation of Revenue [Line Items]
Total Other Revenues	7	12
AEPTHCo | Operating Segments | Other Revenues
Disaggregation of Revenue [Line Items]
Total Other Revenues	0	0
G&M | Retail, Trading and Marketing Revenues | Related Party
Disaggregation of Revenue [Line Items]
Total Revenues from Contracts with Customers	21	16
G&M | Operating Segments
Disaggregation of Revenue [Line Items]
Total Revenues from Contracts with Customers	853	890
Total Revenues	952	747
G&M | Operating Segments | Related Party
Disaggregation of Revenue [Line Items]
Total Revenues	21	17
G&M | Operating Segments | Total Retail Revenues
Disaggregation of Revenue [Line Items]
Total Revenues from Contracts with Customers	0	0
G&M | Operating Segments | Residential Revenues
Disaggregation of Revenue [Line Items]
Total Revenues from Contracts with Customers	0	0
G&M | Operating Segments | Commercial Revenues
Disaggregation of Revenue [Line Items]
Total Revenues from Contracts with Customers	0	0
G&M | Operating Segments | Industrial Revenues
Disaggregation of Revenue [Line Items]
Total Revenues from Contracts with Customers	0	0
G&M | Operating Segments | Other Retail Revenues
Disaggregation of Revenue [Line Items]
Total Revenues from Contracts with Customers	0	0
G&M | Operating Segments | Total Wholesale and Competitive Retail Revenues
Disaggregation of Revenue [Line Items]
Total Revenues from Contracts with Customers	822	889
G&M | Operating Segments | Generation Revenues
Disaggregation of Revenue [Line Items]
Total Revenues from Contracts with Customers	52	51
G&M | Operating Segments | Transmission Revenues
Disaggregation of Revenue [Line Items]
Total Revenues from Contracts with Customers	0	0
G&M | Operating Segments | Retail, Trading and Marketing Revenues
Disaggregation of Revenue [Line Items]
Total Revenues from Contracts with Customers	770	838
G&M | Operating Segments | Other Revenues
Disaggregation of Revenue [Line Items]
Total Revenues from Contracts with Customers	31	1
G&M | Operating Segments | Total Other Revenues
Disaggregation of Revenue [Line Items]
Total Other Revenues	99	(143)
G&M | Operating Segments | Alternative Revenue Programs
Disaggregation of Revenue [Line Items]
Total Other Revenues	0	0
G&M | Operating Segments | Other Revenues
Disaggregation of Revenue [Line Items]
Total Other Revenues	$ 99	$ (143)