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		0	(6)
Employee stock awards and options		2	49
Spin-off of Shipbuilding business			(1,887)		524
Net earnings	530			530
Dividends declared				(138)
Other comprehensive income, net of tax	46				46
Total shareholders' equity	12,556
Cash dividends declared per share	$ 0.47
End of period at Mar. 31, 2011				8,516
End of period at Mar. 31, 2011					(2,187)
End of period at Mar. 31, 2011		293
End of period at Mar. 31, 2011			5,934
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		(4)	(256)
Employee stock awards and options		2	29
Spin-off of Shipbuilding business			0		0
Net earnings	506			506
Dividends declared				(128)
Other comprehensive income, net of tax	56				56
Total shareholders' equity	10,541
End of period at Mar. 31, 2012	10,077			10,077
End of period at Mar. 31, 2012	(3,434)				(3,434)
End of period at Mar. 31, 2012	252	252
End of period at Mar. 31, 2012	$ 3,646		$ 3,646