Basis of Presentation (Unaudited) (Tables)

9 Months Ended

Sep. 30, 2016

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Schedule of Change in Accounting Estimate [Table Text Block]

The following table presents the effect of aggregate net EAC adjustments:

	Three Months Ended September 30				Nine Months Ended September 30
$ in millions, except per share data	2016		2015		2016		2015
Operating Income	$	121	$	112	$	387	$	461
Net Earnings(1)	79		73		252		300
Diluted earnings per share(1)	0.44		0.39		1.39		1.55

⁽¹⁾  Based on statutory tax rates

Accumulated Other Comprehensive Loss

The components of accumulated other comprehensive loss are as follows:

$ in millions	September 30, 2016			December 31, 2015
Unamortized benefit plan costs, net of tax benefit of $3,166 as of September 30, 2016 and $3,350 as of December 31, 2015	$	(4,939	)	$	(5,241	)
Cumulative translation adjustment	(101		)	(82		)
Net unrealized gain on marketable securities and cash flow hedges, net of tax	2			3
Total accumulated other comprehensive loss	$	(5,038	)	$	(5,320	)