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RISK MANAGEMENT AND FINANCIAL INSTRUMENTS - Schedule of the Maturity and Notional Principal or Quantity Outstanding Related to Derivative Instruments (Details) - Sep. 30, 2025
€ in Millions, £ in Millions, $ in Millions, $ in Millions
USD ($)
MWh
MMBbls
Bcf
GBP (£)
MWh
MMBbls
Bcf
EUR (€)
MWh
MMBbls
Bcf
CAD ($)
MWh
MMBbls
Bcf
Foreign exchange contracts - United States dollar or GBP or Japanese yen forwards - purchase        
RISK MANAGEMENT AND FINANCIAL INSTRUMENTS        
2025 $ 936      
2026 4      
2027 0      
2028 0      
2029 0      
Thereafter 0      
Total notional principal 940      
Foreign exchange contracts - United States dollar or GBP forwards or Euro forwards - sell        
RISK MANAGEMENT AND FINANCIAL INSTRUMENTS        
2025 1,976 £ 12 € 31  
2026 5,872 28 121  
2027 5,201 32 81  
2028 4,032 0 67  
2029 1,398 0 66  
Thereafter 150 0 129  
Total notional principal 18,629 £ 72 € 495  
Foreign exchange contracts - United States dollar or GBP forwards or Euro Collars - sell        
RISK MANAGEMENT AND FINANCIAL INSTRUMENTS        
2025 0      
2026 120      
2027 0      
2028 0      
2029 0      
Thereafter 0      
Total notional principal $ 120      
Interest rate contracts - short-term borrowings        
RISK MANAGEMENT AND FINANCIAL INSTRUMENTS        
2025       $ 1,052
2026       3,905
2027       2,849
2028       2,223
2029       1,003
Thereafter       0
Total notional principal       11,032
Interest rate contracts - receive fixed rate        
RISK MANAGEMENT AND FINANCIAL INSTRUMENTS        
2025       378
2026       1,500
2027       1,500
2028       1,500
2029       1,500
Thereafter       7,211
Total notional principal       13,589
Interest rate contract - long term debt - Pay Fixed Rate        
RISK MANAGEMENT AND FINANCIAL INSTRUMENTS        
2025       661
2026       3,352
2027       174
2028       0
2029       0
Thereafter       0
Total notional principal       4,187
Interest rate contract for costless collar        
RISK MANAGEMENT AND FINANCIAL INSTRUMENTS        
2025       497
2026       1,976
2027       1,849
2028       78
2029       0
Thereafter       0
Total notional principal       $ 4,400
Commodity contracts | Natural gas        
RISK MANAGEMENT AND FINANCIAL INSTRUMENTS        
2025 notional quantity (bcf / mmbbls) | Bcf 23,000,000 23,000,000 23,000,000 23,000,000
2026 notional quantity (bcf / mmbbls) | Bcf 118,000,000 118,000,000 118,000,000 118,000,000
2027 notional quantity (bcf / mmbbls) | Bcf 63,000,000 63,000,000 63,000,000 63,000,000
2028 notional quantity (bcf / mmbbls) | Bcf 24,000,000 24,000,000 24,000,000 24,000,000
2029 notional quantity (bcf / mmbbls) | Bcf 12,000,000 12,000,000 12,000,000 12,000,000
Thereafter notional quantity (bcf / mmbbls) | Bcf 6,000,000 6,000,000 6,000,000 6,000,000
Total notional quantity (bcf / mmbbls) | Bcf 246,000,000 246,000,000 246,000,000 246,000,000
Commodity contracts | Crude        
RISK MANAGEMENT AND FINANCIAL INSTRUMENTS        
2025 notional quantity (bcf / mmbbls) | MMBbls (8,000,000) (8,000,000) (8,000,000) (8,000,000)
2026 notional quantity (bcf / mmbbls) | MMBbls 11,000,000 11,000,000 11,000,000 11,000,000
2027 notional quantity (bcf / mmbbls) | MMBbls 13,000,000 13,000,000 13,000,000 13,000,000
2028 notional quantity (bcf / mmbbls) | MMBbls 1,000,000 1,000,000 1,000,000 1,000,000
2029 notional quantity (bcf / mmbbls) | MMBbls 1,000,000 1,000,000 1,000,000 1,000,000
Thereafter notional quantity (bcf / mmbbls) | MMBbls 1,000,000 1,000,000 1,000,000 1,000,000
Total notional quantity (bcf / mmbbls) | MMBbls 19,000,000 19,000,000 19,000,000 19,000,000
Commodity contracts | Power        
RISK MANAGEMENT AND FINANCIAL INSTRUMENTS        
2025 notional quantity (MWH) | MWh 141,000,000 141,000,000 141,000,000 141,000,000
2026 notional quantity (MWH) | MWh 142,000,000 142,000,000 142,000,000 142,000,000
2027 notional quantity (MWH) | MWh 85,000,000 85,000,000 85,000,000 85,000,000
2028 notional quantity (MWH) | MWh 30,000,000 30,000,000 30,000,000 30,000,000
2029 notional quantity (MW/H) | MWh 29,000,000 29,000,000 29,000,000 29,000,000
Thereafter notional quantity (MWH) | MWh (2,000,000) (2,000,000) (2,000,000) (2,000,000)
Total notional quantity (MWH) | MWh 34,000,000 34,000,000 34,000,000 34,000,000