CONSOLIDATED STATEMENTS OF COMPREHENSIVE (LOSS) INCOME - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014		Dec. 31, 2013
Net (loss) income	$ (12,089)	$ (745)	[1],[2]	$ 3,441
Defined benefit plans:
Actuarial (losses) gains arising during the period	(5)	(166)		73
Prior service costs arising during the period	0	0		(21)
Amortization of unrecognized amounts included in net periodic benefit costs	38	25		30
Foreign exchange gains	8	1		12
Translation adjustments and unrealized losses on securities	0	(1)		4
Other comprehensive income (loss)	41	(141)		98
Total comprehensive (loss) income	(12,048)	(886)		3,539
Total comprehensive income attributable to noncontrolling interests	(106)	(521)		(758)
Preferred dividends attributable to redeemable noncontrolling interest	(41)	(40)		(22)
Total comprehensive (loss) income attributable to common stockholders	$ (12,195)	$ (1,447)		$ 2,759

[1] Includes net gains (losses) on early extinguishment of debt totaling $4 million in the second quarter, $17 million ($0.02 per share) in the third quarter, $(18) million ($(0.02) per share) in the fourth quarter and $3 million for the year. Refer to Note 8 for further discussion.

[2] Includes tax charges of $57 million ($0.06 per share) in the second quarter, $5 million in the third quarter, $22 million ($0.02 per share) in the fourth quarter and $84 million ($0.08 per share) for the year associated with deferred taxes recorded in connection with the allocation of goodwill to the sale of the Eagle Ford shale assets. Additionally, includes net tax charges (benefit) of $54 million ($7 million attributable to noncontrolling interests and $47 million to net income attributable to common stockholders or $0.04 per share) in the third quarter, $(17) million ($11 million attributable to noncontrolling interests and $(28) million to net loss attributable to common stockholders or $(0.03) per share) in the fourth quarter and $37 million ($18 million attributable to noncontrolling interests and $19 million to net loss attributable to common stockholders or $0.02 per share) for the year associated with changes in Chilean tax rules, U.S. federal income tax law and Peruvian tax rules, partially offset by a tax benefit related to changes in U.S. state income tax filing positions.