Income Taxes - Total Provision for Income Taxes (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015		Dec. 31, 2014
Current income taxes:
Federal	$ (14)	$ 363		$ (10)
State	(30)	41		1
Foreign	435	31		1,290
Current tax, net	391	435	[1]	1,281	[1]
Deferred income taxes:
Federal	(257)	(1,123)		(671)
State	0	(51)		(45)
Foreign	(576)	(271)		(1,083)
Deferred taxes, net	(833)	(1,445)	[1],[2]	(1,799)	[1],[2]
Total	$ (442)	$ (1,010)		$ (518)

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

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