RISK MANAGEMENT ACTIVITIES AND FAIR VALUE MEASUREMENTS - ADDITIONAL INFORMATION (Details) - USD ($) $ in Millions	3 Months Ended
	Sep. 30, 2021	Jun. 30, 2021
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash Equivalents, at Carrying Value	$ 9,000	$ 9,100
Equity Securities, FV-NI	131	163
Equity Securities, FV-NI, Unrealized Gain (Loss)	(29)
Derivatives in Fair Value Hedging Relationships | Underlying, Other
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Underlying Debt Obligation, Carrying Amt	7,400	7,500
Derivatives in Net Investment Hedging Relationships | Underlying, Other
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Underlying Debt Obligation, Carrying Amt	11,700	12,000
Long-term Debt [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Long-term Debt, Fair Value	28,400	28,800
Long Term Debt, Current Maturities Measured at Fair Value	5,900	3,600
Other Investments [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, Fair Value Disclosure	$ 160	$ 192