RISK MANAGEMENT AND FINANCIAL INSTRUMENTS - Schedule of the Maturity and Notional Principal or Quantity Outstanding Related to Derivative Instruments (Details) - Mar. 31, 2025 € in Millions, ¥ in Millions, £ in Millions, $ in Millions, $ in Millions	USD ($) MWh Bcf MMBbls	GBP (£) MWh Bcf MMBbls	EUR (€) MWh Bcf MMBbls	JPY (¥) MWh Bcf MMBbls	CAD ($) MWh Bcf MMBbls
Foreign exchange contracts - United States dollar or GBP or Japanese yen forwards - purchase
RISK MANAGEMENT AND FINANCIAL INSTRUMENTS
2025	$ 791			¥ 84,800
2026	0			0
2027	0			0
2028	0			0
2029	0			0
Thereafter	0			0
Total notional principal	791			¥ 84,800
Foreign exchange contracts - United States dollar or GBP forwards - sell
RISK MANAGEMENT AND FINANCIAL INSTRUMENTS
2025	4,706	£ 23	€ 93
2026	5,627	28	121
2027	4,841	32	81
2028	3,552		67
2029	1,278	0	66
Thereafter	30	0	129
Total notional principal	$ 20,034	£ 83	€ 557
Interest rate contracts - short-term borrowings
RISK MANAGEMENT AND FINANCIAL INSTRUMENTS
2025					$ 1,469
2026					1,737
2027					676
2028					49
2029					13
Thereafter					0
Total notional principal					3,944
Interest rate contract - long term debt - Pay Fixed Rate
RISK MANAGEMENT AND FINANCIAL INSTRUMENTS
2025					2,883
2026					1,384
2027					0
2028					0
2029					0
Thereafter					0
Total notional principal					4,267
Interest rate contract for costless collar
RISK MANAGEMENT AND FINANCIAL INSTRUMENTS
2025					1,520
2026					1,314
2027					846
2028					36
2029					0
Thereafter					0
Total notional principal					$ 3,716
Commodity contracts | Natural gas
RISK MANAGEMENT AND FINANCIAL INSTRUMENTS
2025 notional quantity (bcf / mmbbls) | Bcf	93,000,000	93,000,000	93,000,000	93,000,000	93,000,000
2026 notional quantity (bcf / mmbbls) | Bcf	87,000,000	87,000,000	87,000,000	87,000,000	87,000,000
2027 notional quantity (bcf / mmbbls) | Bcf	42,000,000	42,000,000	42,000,000	42,000,000	42,000,000
2028 notional quantity (bcf / mmbbls) | Bcf	14,000,000	14,000,000	14,000,000	14,000,000	14,000,000
2029 notional quantity (bcf / mmbbls) | Bcf	4,000,000	4,000,000	4,000,000	4,000,000	4,000,000
Thereafter notional quantity (bcf / mmbbls) | Bcf	2,000,000	2,000,000	2,000,000	2,000,000	2,000,000
Total notional quantity (bcf / mmbbls) | Bcf	242,000,000	242,000,000	242,000,000	242,000,000	242,000,000
Commodity contracts | Crude
RISK MANAGEMENT AND FINANCIAL INSTRUMENTS
2025 notional quantity (bcf / mmbbls) | MMBbls	1,000,000	1,000,000	1,000,000	1,000,000	1,000,000
2026 notional quantity (bcf / mmbbls) | MMBbls	5,000,000	5,000,000	5,000,000	5,000,000	5,000,000
2027 notional quantity (bcf / mmbbls) | MMBbls	(3,000,000)	(3,000,000)	(3,000,000)	(3,000,000)	(3,000,000)
2028 notional quantity (bcf / mmbbls) | MMBbls	1,000,000	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	1,000,000
Thereafter notional quantity (bcf / mmbbls) | MMBbls	1,000,000	1,000,000	1,000,000	1,000,000	1,000,000
Total notional quantity (bcf / mmbbls) | MMBbls	6,000,000	6,000,000	6,000,000	6,000,000	6,000,000
Commodity contracts | Power | Net purchase
RISK MANAGEMENT AND FINANCIAL INSTRUMENTS
2025 notional quantity (MWH) | MWh	118,000,000	118,000,000	118,000,000	118,000,000	118,000,000
2026 notional quantity (MWH) | MWh	107,000,000	107,000,000	107,000,000	107,000,000	107,000,000
2027 notional quantity (MWH) | MWh	51,000,000	51,000,000	51,000,000	51,000,000	51,000,000
2028 notional quantity (MWH) | MWh	30,000,000	30,000,000	30,000,000	30,000,000	30,000,000
2028 (MW/H) | MWh	30,000,000	30,000,000	30,000,000	30,000,000	30,000,000
Thereafter notional quantity (MWH) | MWh	0	0	0	0	0
Total notional quantity (MWH) | MWh	64,000,000	64,000,000	64,000,000	64,000,000	64,000,000