Basis of Presentation (Unaudited) (Tables)

3 Months Ended

Mar. 31, 2018

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 March 31
$ in millions, except per share data	2018		2017
Operating Income	$	116	$	141
Net Earnings(1)	92		92
Diluted earnings per share(1)	0.52		0.52

⁽¹⁾  Based on statutory tax rates in effect for each period presented.

Contract with Customer, Asset and Liability [Table Text Block]

Net contract assets (liabilities) are as follows:

$ in millions	March 31, 2018			December 31, 2017			$ Change		% Change
Unbilled receivables, net	$	3,869		$	3,465		$	404	12	%
Advance payments and amounts in excess of costs incurred	(1,479		)	(1,761		)	282		(16	)%
Net contract assets (liabilities)	$	2,390		$	1,704		$	686	40	%

Accumulated Other Comprehensive Loss

The components of accumulated other comprehensive loss are as follows:

$ in millions	March 31, 2018			December 31, 2017
Unamortized benefit plan costs, net of tax benefit of $1,968 for 2018 and $3,056 for 2017	$	(5,560	)	$	(4,586	)
Cumulative translation adjustment	(138		)	(136		)
Other, net	(1		)	4
Total accumulated other comprehensive loss	$	(5,699	)	$	(4,718	)