CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) [Abstract]
Net income (loss)		$ (2,643)	$ (4,556)	$ 924
Change in derivatives:
Settlements	[1]		(128)	16
Ineffectiveness			1
Change in fair value of derivative instruments	[2]		29	73
Total change in derivatives			(98)	89
Change in value of pension and other postretirement liabilities:
Amortization of prior service cost and net loss included in net periodic pension cost	[3]	13	2
Net gain (loss) incurred in period	[4]	(7)	(3)	(15)
Total change in value of pension and other postretirement liabilities		6	(1)	(15)
Change in currency translation adjustment		3	(11)	(8)
Comprehensive income (loss)		$ (2,634)	$ (4,666)	$ 990

[1] Net of ($81) million and $10 million in taxes for the years ended December 31, 2015 and 2014, respectively.

[2] Net of $16 million and $49 million in taxes for the years ended December 31, 2015 and 2014, respectively.

[3] Net of $8 million in taxes for the year ended December 31, 2016.

[4] Net of ($4) million and ($10) million in taxes for the years ended December 31, 2016 and 2014, respectively.