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RISK MANAGEMENT ACTIVITIES AND FAIR VALUE MEASUREMENTS - ASSETS AND LIABILITIES MEASURED ON A RECURRING BASIS (Details) - USD ($)
$ in Millions
Mar. 31, 2019
Jun. 30, 2018
Investments, Fair Value Disclosure $ 7,250 $ 9,422
Other Investments    
Investments, Fair Value Disclosure 165 141
Corporate Bond Securities [Member]    
Investments, Fair Value Disclosure 2,778 3,737
US Government Agencies Debt Securities [Member]    
Investments, Fair Value Disclosure $ 4,307 $ 5,544