RISK MANAGEMENT ACTIVITIES AND FAIR VALUE MEASUREMENTS - LIABILITIES - ADDITIONAL INFORMATION (Details) - USD ($) $ in Millions |
Jun. 30, 2016 |
Jun. 30, 2015 |
|---|---|---|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | ||
| Long-term Debt, Fair Value | $ 24,362 | $ 23,127 |
| Long Term Debt, Current Maturities Measured at Fair Value | 2,761 | 2,776 |
| Fair Value, Inputs, Level 2 | ||
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | ||
| Long-term Debt, Fair Value | $ 2,331 | $ 2,180 |