Basis of Presentation (Unaudited) (Tables)

6 Months Ended

Jun. 30, 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 June 30				Six Months Ended June 30
$ in millions, except per share data	2018		2017		2018		2017
Operating Income	$	143	$	102	$	259	$	243
Net Earnings(1)	113		66		205		158
Diluted earnings per share(1)	0.64		0.38		1.17		0.90

⁽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	June 30, 2018			December 31, 2017			$ Change		% Change
Unbilled receivables, net	$	5,272		$	3,465		$	1,807	52	%
Advance payments and amounts in excess of costs incurred	(1,711		)	(1,761		)	50		(3	)%
Net contract assets (liabilities)	$	3,561		$	1,704		$	1,857	109	%

Accumulated Other Comprehensive Loss

The components of accumulated other comprehensive loss are as follows:

$ in millions	June 30, 2018			December 31, 2017
Unamortized benefit plan costs, net of tax benefit of $1,940 for 2018 and $3,056 for 2017	$	(5,474	)	$	(4,586	)
Cumulative translation adjustment	(138		)	(136		)
Other, net	(4		)	4
Total accumulated other comprehensive loss	$	(5,616	)	$	(4,718	)