Business Dispositions and Discontinued Operations (Unaudited) #1 (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Earnings from discontinued operations, net of tax	$ 0	$ 0	$ 0	$ 34
Shipbuilding Segment
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Sales				1,646
Earnings from discontinued operations				59
Income tax expense				(26)
Earnings, net of tax				33
Gain on divestiture, net of income tax expense of $1				1
Earnings from discontinued operations, net of tax				34
Gain on divestiture, tax				$ 1