Condensed Consolidating Statements Of Earnings (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Condensed Consolidating Financial Information [Line Items]
Revenues	$ 31,513	$ 32,677	$ 32,466
Cost of sales	28,404	26,821	26,557
G&A	2,276	2,030	1,964
Interest, net	(156)	(141)	(157)
Other, net	(136)	33	2
Earnings from continuing operations before income taxes	541	3,718	3,790
Operating earnings	833	3,826	3,945
Provision for income taxes	873	1,166	1,162
Discontinued operations, net of tax	0	(26)	(4)
Equity in net earnings of subsidiaries	0	0	0
Net earnings (loss)	(332)	2,526	2,624
Comprehensive income	(795)	1,650	2,395
Parent
Condensed Consolidating Financial Information [Line Items]
Revenues	0	0	0
Cost of sales	(20)	(13)	1
G&A	89	90	82
Interest, net	(158)	(143)	(161)
Other, net	(126)	5	1
Earnings from continuing operations before income taxes	(353)	(215)	(243)
Operating earnings	(69)	(77)	(83)
Provision for income taxes	(137)	(43)	(78)
Discontinued operations, net of tax		0	0
Equity in net earnings of subsidiaries	(116)	2,698	2,789
Net earnings (loss)	(332)	2,526	2,624
Comprehensive income	(795)	1,650	2,395
Guarantors on a Combined Basis
Condensed Consolidating Financial Information [Line Items]
Revenues	26,349	26,253	26,376
Cost of sales	23,614	21,336	21,558
G&A	1,618	1,499	1,497
Interest, net	(3)	0	1
Other, net	(4)	27	1
Earnings from continuing operations before income taxes	1,110	3,445	3,323
Operating earnings	1,117	3,418	3,321
Provision for income taxes	854	1,097	1,067
Discontinued operations, net of tax		0	0
Equity in net earnings of subsidiaries	0	0	0
Net earnings (loss)	256	2,348	2,256
Comprehensive income	21	2,228	2,101
Other Subsidiaries on a Combined Basis
Condensed Consolidating Financial Information [Line Items]
Revenues	5,164	6,424	6,090
Cost of sales	4,810	5,498	4,998
G&A	569	441	385
Interest, net	5	2	3
Other, net	(6)	1	0
Earnings from continuing operations before income taxes	(216)	488	710
Operating earnings	(215)	485	707
Provision for income taxes	156	112	173
Discontinued operations, net of tax		(26)	(4)
Equity in net earnings of subsidiaries	0	0	0
Net earnings (loss)	(372)	350	533
Comprehensive income	(90)	157	857
Consolidating Adjustments
Condensed Consolidating Financial Information [Line Items]
Revenues	0	0	0
Cost of sales	0	0	0
G&A	0	0	0
Interest, net	0	0	0
Other, net	0	0	0
Earnings from continuing operations before income taxes	0	0	0
Operating earnings	0	0	0
Provision for income taxes	0	0	0
Discontinued operations, net of tax		0	0
Equity in net earnings of subsidiaries	116	(2,698)	(2,789)
Net earnings (loss)	116	(2,698)	(2,789)
Comprehensive income	$ 69	$ (2,385)	$ (2,958)