CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) [Abstract]
Net income (loss)		$ (4,556)	$ 924	$ 704
Change in derivatives:
Settlements	[1]	(128)	16	(185)
Ineffectiveness	[2]	1		1
Change in fair value of derivative instruments	[3]	29	73	22
Total change in derivatives		(98)	89	(162)
Change in value of pension and other postretirement liabilities:
Current period net gain (loss)	[4]	(3)	(15)	11
Amortization of prior service cost and net loss included in net periodic pension cost	[5]	2		1
Total change in value of pension and other postretirement liabilities		(1)	(15)	12
Change in currency translation adjustment		(11)	(8)	(4)
Comprehensive income (loss)		$ (4,666)	$ 990	$ 550

[1] Net of ($81), $10, and ($124) million in taxes for the years ended December 31, 2015, 2014 and 2013, respectively.

[2] Net of $0, $0, and $1 million in taxes for the years ended December 31, 2015, 2014 and 2013, respectively.

[3] Net of $16, $49, and $16 million in taxes for the years ended December 31, 2015, 2014 and 2013, respectively.

[4] Net of $0, ($10), and $8 million in taxes for the years ended December 31, 2015, 2014 and 2013, respectively.

[5] Net of $0, $0, and $1 million in taxes for the years ended December 31, 2015, 2014, and 2013, respectively.