RISK MANAGEMENT ACTIVITIES AND FAIR VALUE MEASUREMENTS - ADDITIONAL INFORMATION (DETAILS) (USD $) In Millions, unless otherwise specified						12 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014 US Treasury and Government [Member]	Jun. 30, 2013 US Treasury and Government [Member]	Jun. 30, 2014 Corporate Debt Securities [Member]	Jun. 30, 2014 Minimum [Member] US Treasury and Government [Member]	Jun. 30, 2014 Maximum [Member] US Treasury and Government [Member]	Jun. 30, 2014 Future [Member] Maximum [Member]	Jun. 30, 2014 Options [Member] Maximum [Member]	Jun. 30, 2014 Swap [Member] Maximum [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative term of contract								1 year	1 year	5 years
Available-for-sale Securities, Amortized Cost Basis			$ 1,649	$ 1,604	$ 497
Available-for-sale maturities						1 year	5 years
Amortized cost basis, maturing in less than one year					39
Amortized cost basis, maturing in one to five years					458
Industrial Development Bonds at Fair Value Level 2	455
Long Term Debt, Current Maturities measured at Fair Value	$ 4,400	$ 4,540