Stock Compensation Plans and Other Compensation Arrangements (Details 2) (Stock Option Plan, USD $) In Millions, except Share data in Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011 Year
Stock Option Plan
Stock Option Activity (Table Amounts)
Shares under option - outstanding at January 1, 2011	13,221
Shares under option - granted	848
Shares under option - exercised	(2,384)
Shares under option - cancelled and forfeited	(91)
Shares under option - Shipbuilding spin-off adjustments	150
Shares under option - outstanding at December 31, 2011	11,744
Shares under option - vested and expected to vest in the future at December 31, 2011	11,716
Shares under option - exercisable at December 31, 2011	8,974
Weighted-average exercise price - outstanding at January 1, 2011	$ 55
Weighted-average exercise price - granted	$ 63
Weighted-average exercise price - exercised	$ 44
Weighted-average exercise price - cancelled and forfeited	$ 55
Weighted average exercise price - Shipbuilding spin-off adjustments	$ 59
Weighted-average exercise price - outstanding at December 31, 2011	$ 53
Weighted-average exercise price - vested and expected to vest in the future at December 31, 2011	$ 53
Weighted-average exercise price - exercisable at December 31, 2011	$ 53
Weighted-average remaining contractual term - outstanding at January 1, 2011 (Years)	3.8
Weighted-average remaining contractual term - outstanding at December 31, 2011 (Years)	3.4
Weighted-average remaining contractual term - vested and expected to vest in the future at December 31, 2011 (Years)	3.4
Weighted-average remaining contractual term - exercisable at December 31, 2011 (Years)	2.8
Aggregate intrinsic value - outstanding at January 1, 2011	$ 149
Aggregate intrinsic value - outstanding at December 31, 2011	93
Aggregate intrinsic value - vested and expected to vest in the future at December 31, 2011	93
Aggregate intrinsic value - exercisable at December 31, 2011	$ 79