Basis of Presentation (Unaudited) (Tables)

9 Months Ended

Sep. 30, 2015

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Schedule of Change in Accounting Estimate [Table Text Block]

The effect of aggregate net changes in contract estimates recognized using the cumulative catch-up method of accounting is as follows:

	Three Months Ended September 30				Nine Months Ended September 30
$ in millions, except per share data	2015		2014		2015		2014
Operating Income	$	112	$	194	$	461	$	556
Net Earnings (1)	73		126		300		361
Diluted earnings per share (1)	0.39		0.60		1.55		1.68

(1) Based on statutory tax rates

Accumulated Other Comprehensive Loss

The components of accumulated other comprehensive loss are as follows:

$ in millions	September 30, 2015			December 31, 2014
Unamortized benefit plan costs, net of tax benefit of $3,217 as of September 30, 2015 and $3,395 as of December 31, 2014	$	(5,028	)	$	(5,316	)
Cumulative translation adjustment	(72		)	(41		)
Net unrealized gain on marketable securities and cash flow hedges, net of tax	1			1
Total accumulated other comprehensive loss	$	(5,099	)	$	(5,356	)