CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) (Parenthetical) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME LOSS [Abstract]
Settlements tax		$ (19)		$ (56)
Change in fair value of derivative instruments tax		$ 5		13
Amortization of prior service cost and net loss included in net periodic pension cost tax			$ 1	$ 1
Net gain incurred in period tax	$ 1		$ 2