CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) (Parenthetical) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) [Abstract]
Settlements, tax		$ (81)	$ 10
Change in fair value of derivative instruments, tax		$ 16	49
Amortization of prior service cost and net loss included in net periodic pension cost, tax	$ 8
Net gain (loss) incurred in period, tax	$ (4)		$ (10)