Stock Compensation Plans and Other Compensation Arrangements (Tables)

12 Months Ended

Dec. 31, 2013

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, 2013, 2012 and 2011, were as follows:

	Year Ended December 31
$ in millions	2013		2012		2011
Stock-based compensation expense:
Stock options		$ 4		$ 10		$ 14
Stock awards	140		173		125
Total stock-based compensation expense	144		183		139
Tax benefits from the exercise of stock options	25		26		18
Tax benefits from the issuance of stock awards	16		19		37
Total tax benefits recognized for stock-based compensation		$ 41		$ 45		$ 55

Stock Option Rollforward Activity

Stock option activity for the year ended December 31, 2013, 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, 2013	6,271			$58	2.9 years		$66
Exercised	(4,522	)	59
Cancelled and forfeited	(29	)	60
Outstanding at December 31, 2013	1,720		56		2.6 years	101
Vested and expected to vest in the future at December 31, 2013	1,716		56		2.6 years	101
Exercisable at December 31, 2013	1,343			$55	2.2 years		$80

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, 2011	4,300			$53	1.5
Granted	1,748		63
Vested	(1,824	)	42
Forfeited	(350	)	50
Shipbuilding spin-off adjustment	(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
Granted	1,577		64
Vested	(1,323	)	60
Forfeited	(312	)	62
Outstanding at December 31, 2013	3,420			$61	1.5