v3.25.2
COMMITMENTS, GUARANTEES AND CONTINGENCIES - Narrative (Details)
 3 Months Ended 6 Months Ended
Jun. 30, 2024
USD ($)
Jun. 30, 2025
USD ($)
uncommittedFacility
a
unit
Other Commitments [Line Items]    
Number of uncommitted facilities | uncommittedFacility   6
Liabilities Incurred   $ 17,400,000
Area of land closed, noncompliant with CCR rule | a   300
CCR Rule Revision    
Other Commitments [Line Items]    
Liabilities Incurred $ 674,000,000  
SWEPCo    
Other Commitments [Line Items]    
Liabilities Incurred   $ 0
I&M | Cook Plant    
Other Commitments [Line Items]    
Nuclear contingencies, number of units | unit   2
Line of Credit | Revolving Credit Facility | Revolving Credit Facility, Due March 2029    
Other Commitments [Line Items]    
Line of credit facility, borrowing capacity   $ 5,000,000,000
Line of Credit | Revolving Credit Facility | Revolving Credit Facility, Due March 2027    
Other Commitments [Line Items]    
Line of credit facility, borrowing capacity   1,000,000,000
Line of Credit | Letter of Credit    
Other Commitments [Line Items]    
Debt instrument, face amount   450,000,000
Line of Credit | Letter of Credit | Subsidiaries    
Other Commitments [Line Items]    
Line of credit facility, borrowing capacity   1,200,000,000
Line of Credit | Letter of Credit | Revolving Credit Facility, Due March 2029    
Other Commitments [Line Items]    
Line of credit facility, borrowing capacity   0
Line of Credit | Letter of Credit | Revolving Credit Facility, Due March 2027    
Other Commitments [Line Items]    
Line of credit facility, borrowing capacity   $ 0