Basis of Presentation (Unaudited) (Tables)

9 Months Ended

Sep. 30, 2020

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	2020		2019		2020		2019
Revenue	$	124	$	142	$	385	$	462
Operating income	123		125		359		421
Net earnings(1)	97		99		284		333
Diluted earnings per share(1)	0.58		0.58		1.69		1.96

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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, 2020			December 31, 2019
Unamortized prior service credit, net of tax expense of $6 for 2020 and $17 for 2019	$	20		$	51
Cumulative translation adjustment and other, net	(141		)	(148		)
Total accumulated other comprehensive loss	$	(121	)	$	(97	)