Basis of Presentation (Unaudited) (Tables)

9 Months Ended

Sep. 30, 2019

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	2019		2018		2019		2018
Revenue	$	142	$	149	$	462	$	438
Operating income	125		149		421		408
Net earnings(1)	99		117		333		322
Diluted earnings per share(1)	0.58		0.67		1.96		1.84

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Based on a 21 percent statutory tax rate

Accumulated Other Comprehensive Loss

The components of accumulated other comprehensive loss are as follows:

$ in millions	September 30, 2019			December 31, 2018
Unamortized prior service credit, net of tax expense of $21 for 2019 and $32 for 2018	$	63		$	98
Cumulative translation adjustment	(148		)	(144		)
Other, net	(2		)	(6		)
Total accumulated other comprehensive loss	$	(87	)	$	(52	)