Condensed Consolidated Statements of Changes in Shareholders' Equity (Unaudited) (USD $) In Millions, except Per Share data	Total	Common Stock	Paid-in Capital	Retained Earnings	Accumulated Other Comprehensive Loss
Beginning of year at Dec. 31, 2010				$ 8,124
Beginning of year at Dec. 31, 2010					(2,757)
Beginning of year at Dec. 31, 2010		291
Beginning of year at Dec. 31, 2010			7,778
Common stock repurchased		(16)	(991)
Stock awards and options		3	131
Spin-off of shipbuilding business			(1,892)		524
Net earnings	1,050			1,050
Dividends declared				(277)
Other comprehensive income, net of tax	60				60
Total shareholders' equity	12,028
Cash dividends declared per share	$ 0.97
End of period at Jun. 30, 2011				8,897
End of period at Jun. 30, 2011					(2,173)
End of period at Jun. 30, 2011		278
End of period at Jun. 30, 2011			5,026
Beginning of year at Dec. 31, 2011	9,699			9,699
Beginning of year at Dec. 31, 2011	(3,490)				(3,490)
Beginning of year at Dec. 31, 2011	254	254
Beginning of year at Dec. 31, 2011	3,873		3,873
Common stock repurchased		(9)	(548)
Stock awards and options		3	118
Spin-off of shipbuilding business			0		0
Net earnings	986			986
Dividends declared				(266)
Other comprehensive income, net of tax	95				95
Total shareholders' equity	10,715
Cash dividends declared per share	$ 1.05
End of period at Jun. 30, 2012	10,419			10,419
End of period at Jun. 30, 2012	(3,395)				(3,395)
End of period at Jun. 30, 2012	248	248
End of period at Jun. 30, 2012	$ 3,443		$ 3,443