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RISK MANAGEMENT ACTIVITIES AND FAIR VALUE MEASUREMENTS - ASSETS MEASURED AT FAIR VALUE ON A RECURRING BASIS (Details) - USD ($) $ in Millions	Dec. 31, 2017	Jun. 30, 2017
Fair Value Asset	$ 11,441	$ 9,700
U.S. Government Securities
Fair Value Asset	7,045	6,297
Corporate Bond Securities
Fair Value Asset	4,281	3,271
Other Investments
Fair Value Asset	$ 115	$ 132

- Definition

Fair value portion of investment securities, including, but not limited to, marketable securities, derivative financial instruments, and investments accounted for under the equity method.

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