RISK MANAGEMENT AND FINANCIAL INSTRUMENTS - Notional Principal or Quantity Information (Details) - Jun. 30, 2023 € in Millions, ¥ in Millions, £ in Millions, $ in Millions, $ in Millions	USD ($) MWh MMBbls Bcf	GBP (£) MWh MMBbls Bcf	EUR (€) MWh MMBbls Bcf	JPY (¥) MWh MMBbls Bcf	CAD ($) MWh MMBbls Bcf
Foreign exchange contracts - forwards - purchase
RISK MANAGEMENT AND FINANCIAL INSTRUMENTS
Derivative Notional Amount Outstanding	$ 2,035			¥ 84,800
Foreign exchange contracts - forwards - purchase | United States dollar
RISK MANAGEMENT AND FINANCIAL INSTRUMENTS
2023	535
2024	1,000
2025	500
2026	0
2027	0
Thereafter	0
Foreign exchange contracts - forwards - purchase | Japanese yen
RISK MANAGEMENT AND FINANCIAL INSTRUMENTS
2023 | ¥				0
2024 | ¥				0
2025 | ¥				84,800
2026 | ¥				0
2027 | ¥				0
Thereafter | ¥				¥ 0
Foreign exchange contracts - forwards - sell
RISK MANAGEMENT AND FINANCIAL INSTRUMENTS
Derivative Notional Amount Outstanding	21,821	£ 137	€ 651
Foreign exchange contracts - forwards - sell | United States dollar
RISK MANAGEMENT AND FINANCIAL INSTRUMENTS
2023	3,052
2024	4,708
2025	4,763
2026	4,157
2027	3,131
Thereafter	$ 2,010
Foreign exchange contracts - forwards - sell | GBP
RISK MANAGEMENT AND FINANCIAL INSTRUMENTS
2023 | £		17
2024 | £		30
2025 | £		30
2026 | £		28
2027 | £		32
Thereafter | £		£ 0
Foreign exchange contracts - forwards - sell | Euro
RISK MANAGEMENT AND FINANCIAL INSTRUMENTS
2023 | €			46
2024 | €			91
2025 | €			86
2026 | €			85
2027 | €			81
Thereafter | €			€ 262
Interest rate contracts - short-term borrowings
RISK MANAGEMENT AND FINANCIAL INSTRUMENTS
2023					$ 5,267
2024					4,028
2025					1,072
2026					891
2027					67
Thereafter					39
Derivative Notional Amount Outstanding					11,364
Interest rate contracts - short-term debt receive
RISK MANAGEMENT AND FINANCIAL INSTRUMENTS
2023					448
2024					926
2025					926
2026					175
2027					0
Thereafter					0
Derivative Notional Amount Outstanding					2,475
Interest rate contracts - long-term debt pay fixed rate
RISK MANAGEMENT AND FINANCIAL INSTRUMENTS
2023					3,304
2024					1,478
2025					581
2026					0
2027					0
Thereafter					0
Derivative Notional Amount Outstanding					5,363
Equity contracts
RISK MANAGEMENT AND FINANCIAL INSTRUMENTS
2023					0
2024					32
2025					12
2026					0
2027					0
Thereafter					0
Derivative Notional Amount Outstanding					$ 44
Commodity contracts | Natural gas
RISK MANAGEMENT AND FINANCIAL INSTRUMENTS
2023 (bcf / mmbbls) | Bcf	15,000,000	15,000,000	15,000,000	15,000,000	15,000,000
2024 (bcf / mmbbls) | Bcf	39,000,000	39,000,000	39,000,000	39,000,000	39,000,000
2025 (bcf / mmbbls) | Bcf	25,000,000	25,000,000	25,000,000	25,000,000	25,000,000
2026 (bcf / mmbbls) | Bcf	6,000,000	6,000,000	6,000,000	6,000,000	6,000,000
2027 (bcf / mmbbls) | Bcf	3,000,000	3,000,000	3,000,000	3,000,000	3,000,000
Thereafter (bcf / mmbbls) | Bcf	0	0	0	0	0
Derivative Nonmonetary Notional Amount Outstanding | Bcf	88,000,000	88,000,000	88,000,000	88,000,000	88,000,000
Commodity contracts | Crude
RISK MANAGEMENT AND FINANCIAL INSTRUMENTS
2023 (bcf / mmbbls) | MMBbls	7,000,000	7,000,000	7,000,000	7,000,000	7,000,000
2024 (bcf / mmbbls) | MMBbls	(4,000,000)	(4,000,000)	(4,000,000)	(4,000,000)	(4,000,000)
2025 (bcf / mmbbls) | MMBbls	0	0	0	0	0
2026 (bcf / mmbbls) | MMBbls	0	0	0	0	0
2027 (bcf / mmbbls) | MMBbls	0	0	0	0	0
Thereafter (bcf / mmbbls) | MMBbls	0	0	0	0	0
Derivative Nonmonetary Notional Amount Outstanding | MMBbls	3,000,000	3,000,000	3,000,000	3,000,000	3,000,000
Net sell | Commodity contracts | Power
RISK MANAGEMENT AND FINANCIAL INSTRUMENTS
2023 (MWH) | MWh	98,000,000	98,000,000	98,000,000	98,000,000	98,000,000
2024 (MWH) | MWh	2,000,000	2,000,000	2,000,000	2,000,000	2,000,000
2025 (MW/H) | MWh	22,000,000	22,000,000	22,000,000	22,000,000	22,000,000
2026 (MWH) | MWh	3,000,000	3,000,000	3,000,000	3,000,000	3,000,000
2027 (MW/H) | MWh	3,000,000	3,000,000	3,000,000	3,000,000	3,000,000
Thereafter (MWH) | MWh	0	0	0	0	0
Total (MWH) | MWh	7	7	7	7	7