Income Taxes - Income (Loss) Before Income Taxes (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015		Dec. 31, 2014
Income Tax Disclosure [Abstract]
U.S.	$ (997)	$ (9,386)		$ (4,807)
Foreign	(685)	(2,783)		(2,023)
LOSS FROM CONTINUING OPERATIONS BEFORE INCOME TAXES	$ (1,682)	$ (12,169)	[1]	$ (6,830)	[1]

[1] Financial information for 2015 and 2014 has been recast to reflect retrospective application of the successful efforts method of accounting. See Note 1.