EFFECTS OF REGULATION - Regulatory Liabilities (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024
Regulatory Liability [Line Items]
Total Current Regulatory Liabilities	$ 64	$ 54
Total Noncurrent Regulatory Liabilities and Deferred Investment Tax Credits	8,362	8,344
Pending final regulatory determination
Regulatory Liability [Line Items]
Total Noncurrent Regulatory Liabilities and Deferred Investment Tax Credits	119	322
Approved for payment
Regulatory Liability [Line Items]
Total Noncurrent Regulatory Liabilities and Deferred Investment Tax Credits	8,243	8,022
Pays/paying a return | Over-recovered Fuel Costs
Regulatory Liability [Line Items]
Total Current Regulatory Liabilities	$ 54	22
Remaining Refund Period	1 year
Pays/paying a return | Pending final regulatory determination
Regulatory Liability [Line Items]
Total Noncurrent Regulatory Liabilities and Deferred Investment Tax Credits	$ 90	176
Pays/paying a return | Pending final regulatory determination | Income Taxes, Net
Regulatory Liability [Line Items]
Total Noncurrent Regulatory Liabilities and Deferred Investment Tax Credits	90	176
Pays/paying a return | Approved for payment
Regulatory Liability [Line Items]
Total Noncurrent Regulatory Liabilities and Deferred Investment Tax Credits	5,196	5,526
Pays/paying a return | Approved for payment | Income Taxes, Net
Regulatory Liability [Line Items]
Total Noncurrent Regulatory Liabilities and Deferred Investment Tax Credits	1,048	1,622
Regulatory liabilities, not subject to rate normalization requirements, amount	$ 269	192
Regulatory liabilities, not subject to rate normalization requirements, refund period	8 years
Pays/paying a return | Approved for payment | Asset Removal Costs
Regulatory Liability [Line Items]
Total Noncurrent Regulatory Liabilities and Deferred Investment Tax Credits	$ 4,023	3,828
Pays/paying a return | Approved for payment | Green Country Deferral
Regulatory Liability [Line Items]
Remaining Refund Period	30 years
Total Noncurrent Regulatory Liabilities and Deferred Investment Tax Credits	$ 59	0
Pays/paying a return | Approved for payment | Rockport Plant, Unit 2 Accelerated Depreciation for Leasehold Improvements
Regulatory Liability [Line Items]
Remaining Refund Period	4 years
Total Noncurrent Regulatory Liabilities and Deferred Investment Tax Credits	$ 27	36
Pays/paying a return | Approved for payment | Other Regulatory Liabilities Approved for Payment
Regulatory Liability [Line Items]
Total Noncurrent Regulatory Liabilities and Deferred Investment Tax Credits	39	40
Does not pay/paying a return | Over-recovered Fuel Costs
Regulatory Liability [Line Items]
Total Current Regulatory Liabilities	$ 10	32
Remaining Refund Period	1 year
Does not pay/paying a return | Pending final regulatory determination
Regulatory Liability [Line Items]
Total Noncurrent Regulatory Liabilities and Deferred Investment Tax Credits	$ 29	146
Does not pay/paying a return | Pending final regulatory determination | FERC 2021 Transmission Formula Rate Challenge Refunds
Regulatory Liability [Line Items]
Total Noncurrent Regulatory Liabilities and Deferred Investment Tax Credits	0	131
Does not pay/paying a return | Pending final regulatory determination | Other Regulatory Liabilities Pending Final Regulatory Determination
Regulatory Liability [Line Items]
Total Noncurrent Regulatory Liabilities and Deferred Investment Tax Credits	29	15
Does not pay/paying a return | Approved for payment
Regulatory Liability [Line Items]
Total Noncurrent Regulatory Liabilities and Deferred Investment Tax Credits	3,047	2,496
Does not pay/paying a return | Approved for payment | Other Regulatory Liabilities Approved for Payment
Regulatory Liability [Line Items]
Total Noncurrent Regulatory Liabilities and Deferred Investment Tax Credits	125	79
Does not pay/paying a return | Approved for payment | Excess Nuclear Decommissioning Funding
Regulatory Liability [Line Items]
Total Noncurrent Regulatory Liabilities and Deferred Investment Tax Credits	$ 2,557	2,137
Does not pay/paying a return | Approved for payment | Deferred Investment Tax Credits
Regulatory Liability [Line Items]
Remaining Refund Period	25 years
Total Noncurrent Regulatory Liabilities and Deferred Investment Tax Credits	$ 64	65
Does not pay/paying a return | Approved for payment | Demand Side Management
Regulatory Liability [Line Items]
Remaining Refund Period	2 years
Total Noncurrent Regulatory Liabilities and Deferred Investment Tax Credits	$ 54	53
Does not pay/paying a return | Approved for payment | Spent Nuclear Fuel
Regulatory Liability [Line Items]
Total Noncurrent Regulatory Liabilities and Deferred Investment Tax Credits	$ 51	50
Does not pay/paying a return | Approved for payment | Unrealized Gain on Forward Commitments
Regulatory Liability [Line Items]
Remaining Refund Period	3 years
Total Noncurrent Regulatory Liabilities and Deferred Investment Tax Credits	$ 46	10
Does not pay/paying a return | Approved for payment | PJM Costs and Off-system Sales Margin Sharing - Indiana
Regulatory Liability [Line Items]
Remaining Refund Period	2 years
Total Noncurrent Regulatory Liabilities and Deferred Investment Tax Credits	$ 40	2
Does not pay/paying a return | Approved for payment | Peak Demand Reduction/Energy Efficiency
Regulatory Liability [Line Items]
Remaining Refund Period	2 years
Total Noncurrent Regulatory Liabilities and Deferred Investment Tax Credits	$ 39	33
Does not pay/paying a return | Approved for payment | Over-recovered Fuel Costs - Ohio
Regulatory Liability [Line Items]
Remaining Refund Period	7 years
Total Noncurrent Regulatory Liabilities and Deferred Investment Tax Credits	$ 38	32
Does not pay/paying a return | Approved for payment | 2017-2019 Virginia Triennial Revenue Provision
Regulatory Liability [Line Items]
Remaining Refund Period	24 years
Total Noncurrent Regulatory Liabilities and Deferred Investment Tax Credits	$ 33	$ 35