FAIR VALUE MEASUREMENTS (Details) - Recurring - USD ($) $ in Millions	Jun. 30, 2015	Dec. 31, 2014
Level 1
Assets
Commodity derivative instruments, other current assets		$ 0
Level 2
Assets
Commodity derivative instruments, other current assets	$ 18	24
Liabilities:
Commodity derivative instruments, accrued liabilities	9
Level 3
Assets
Commodity derivative instruments, other current assets		0
Netting and Collateral
Assets
Commodity derivative instruments, other current assets		0
Total Fair Value
Assets
Commodity derivative instruments, other current assets	18	$ 24
Liabilities:
Commodity derivative instruments, accrued liabilities	$ 9