Stock Compensation Plans and Other Compensation Arrangements (Tables)

12 Months Ended

Dec. 31, 2012

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Allocation of Stock-based Compensation Expense by Plan

Stock-based compensation expense and the related tax benefits for the years ended December 31, 2012, 2011, and 2010, were as follows:

	Year Ended December 31
$ in millions	2012		2011		2010
Stock-based compensation expense:
Stock options		$ 10		$ 14		$ 27
Stock awards	173		125		107
Total stock-based compensation expense	183		139		134
Tax benefits from the exercise of stock options	26		18		17
Tax benefits from the issuance of stock awards	19		37		36
Tax benefits recognized for stock-based compensation		$ 45		$ 55		$ 53

Stock Option Rollforward Activity

Stock option activity for the year ended December 31, 2012, was as follows:

	Shares under Option (in thousands)		Weighted- Average Exercise Price		Weighted- Average Remaining Contractual Term	Aggregate Intrinsic Value ($ in millions)
Outstanding at January 1, 2012	11,744			$53	3.4 years		$93
Granted	—		—
Exercised	(5,404	)	47
Cancelled and forfeited	(69	)	61
Outstanding at December 31, 2012	6,271		58		2.9 years	66
Vested and expected to vest in the future at December 31, 2012	6,257		58		2.9 years	66
Exercisable at December 31, 2012	4,874			$58	2.5 years		$53

Stock Award Rollforward Activity

	Stock Awards (in thousands)		Weighted- Average Grant Date Fair Value		Weighted- Average Remaining Contractual Term (in years)
Outstanding at January 1, 2010	3,658			$58	1.6
Granted	2,317		60
Vested	(1,319	)	79
Forfeited	(356	)	56
Outstanding at December 31, 2010	4,300			$53	1.5
Granted	1,748		63
Vested	(1,824	)	42
Forfeited	(350	)	50
Shipbuilding spin-off adjustments	(252	)		$47
Outstanding at December 31, 2011	3,622			$58	1.6
Granted	1,860		60
Vested	(1,800	)	55
Forfeited	(204	)	59
Outstanding at December 31, 2012	3,478			$61	1.6