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Business Dispositions (Details 2) (Unaudited) (USD $)		9 Months Ended	12 Months Ended	3 Months Ended		9 Months Ended
Business Dispositions (Details 2) (Unaudited) (USD $)	Sep. 30, 2011	Sep. 30, 2010 Advisory Services Division	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	Sep. 30, 2010 NSTec Joint Venture
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Pro rata shares						6
Total shares distributed						48,800,000
Total debt				$ 1,200,000,000		$ 1,200,000,000
Aggregate principal amount	2,000,000,000			650,000,000		650,000,000
Term loan				575,000,000		575,000,000
Debt proceeds used for cash contribution						1,429,000,000
Shipbuilding spinoff non-deductible transaction costs						28,000,000	21,000,000
Shipbuilding spinoff total transaction costs						60,000,000
Proceeds from disposition			1,650,000,000
Gain from discontinued operations, net of tax			15,000,000	0	8,000,000	1,000,000	15,000,000
Sales and service revenues				0	1,666,000,000	1,646,000,000	4,980,000,000	451,000,000
Additional gain from discontinued operations, net of tax		$ 13,000,000