Business Dispositions (Details 1) (Unaudited) (USD $) In Millions	3 Months Ended	9 Months Ended			12 Months Ended	3 Months Ended		9 Months Ended
	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010	Dec. 31, 2010	Dec. 31, 2009 Advisory Services Division	Sep. 30, 2011 Shipbuilding Segment	Sep. 30, 2010 Shipbuilding Segment	Sep. 30, 2011 Shipbuilding Segment	Sep. 30, 2010 Shipbuilding Segment	Dec. 31, 2010 Shipbuilding Segment
Discontinued Operations Income Statement Disclosures (Table Amounts)
Sales and service revenues						$ 0	$ 1,666	$ 1,646	$ 4,980
Earnings from discontinued operations						0	75	59	121
Income tax expense						0	(34)	(26)	(57)
Earnings, net of tax						0	41	33	64
Gain (loss) on divestiture						0	(1)	2	10
Income tax benefit (expense)						0	9	(1)	5
Gain on divestures, net of tax					15	0	8	1	15
Earnings from discontinued operations, net of tax	49	34	79			0	49	34	79
Assets
Current assets		7,686		13,801						1,315
Property, plant, and equipment, net		3,010		3,045						1,997
Goodwill		12,376		12,376						1,141
Other assets		1,022		1,076						759
Total assets of discontinued operations										5,212
Liabilities
Trade accounts payable		1,338		1,573						274
Other current liabilities		1,524		1,763						955
Total current liabilities		5,721		10,027						1,229
Long-term liabilities										1,563
Total liabilities of discontinued operations										$ 2,792