Consolidated Statements Of Equity - USD ($) shares in Millions, $ in Millions		Total		Common Stock [Member]	Additional Paid-In Capital [Member]	Retained Earnings (Accumulated Deficit) [Member]	Accumulated Other Comprehensive Earnings [Member]	Treasury Stock [Member]	Noncontrolling Interests [Member]
Effect of change in accounting principle | Restatement Adjustment		$ (1,552)				$ (2,227)	$ 675
Balance (Scenario, Previously Reported) at Dec. 31, 2014		26,341		$ 41	$ 4,088	16,631	779		$ 4,802
Balance at Dec. 31, 2014	[1]	24,789		$ 41	4,088	14,404	1,454		4,802
Balance, shares (Scenario, Previously Reported) at Dec. 31, 2014				409
Balance, shares at Dec. 31, 2014	[1]			409
Net earnings (loss)		(13,645)	[1]			(12,896)			(749)
Other comprehensive earnings (loss), net of tax		(433)	[1]				(433)
Stock option exercises		4			4
Restricted stock grants, net of cancellations, shares				2
Common stock repurchased		(35)						$ (35)
Common stock retired					(35)			35
Common stock dividends		(396)				(396)
Common stock issued		199		$ 1	198
Common stock issued, shares				7
Share-based compensation		165			165
Share-based compensation tax expense		(9)			(9)
Subsidiary equity transactions		726			585				141
Distributions to noncontrolling interests		(254)							(254)
Balance at Dec. 31, 2015	[1]	11,111		$ 42	4,996	1,112	1,021		3,940
Balance, shares at Dec. 31, 2015	[1]			418
Net earnings (loss)		(1,458)	[1]			(1,056)			(402)
Other comprehensive earnings (loss), net of tax		33	[1]				33
Restricted stock grants, net of cancellations, shares				2
Common stock repurchased		(28)						(28)
Common stock retired					(28)			28
Common stock dividends		(221)			(96)	(125)
Common stock issued		2,127		$ 10	2,117
Common stock issued, shares				103
Share-based compensation		168			168
Subsidiary equity transactions		1,294			80				1,214
Distributions to noncontrolling interests		(304)							(304)
Balance at Dec. 31, 2016	[1]	12,722		$ 52	7,237	(69)	1,054		4,448
Balance, shares at Dec. 31, 2016	[1]			523
Net earnings (loss)		1,078				898			180
Other comprehensive earnings (loss), net of tax		112					112
Restricted stock grants, net of cancellations, value		1		$ 1
Restricted stock grants, net of cancellations, shares				1
Common stock repurchased		(44)						(44)
Common stock retired					(44)			$ 44
Common stock dividends		(127)				(127)
Share-based compensation		126			126
Share-based compensation, shares				1
Subsidiary equity transactions		590			14				576
Distributions to noncontrolling interests		(354)							(354)
Balance at Dec. 31, 2017		$ 14,104		$ 53	$ 7,333	$ 702	$ 1,166		$ 4,850
Balance, shares at Dec. 31, 2017				525

[1] Prior year amounts have been recast due to change in accounting principle. See Note 2 in “Item 8. Financial Statements and Supplementary Data” of this report.