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Basis of Presentation (Unaudited) (Tables)
 3 Months Ended
Mar. 31, 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 March 31
$ in millions, except per share data
2020
 
2019
Revenue
$
136

 
$
166

Operating income
124

 
138

Net earnings(1)
98

 
109

Diluted earnings per share(1)
0.58

 
0.64

(1) 
Based on a 21 percent statutory tax rate
Accumulated Other Comprehensive Loss
The components of accumulated other comprehensive loss are as follows:
$ in millions
March 31,
2020
December 31,
2019
Unamortized prior service credit, net of tax expense of $13 for 2020 and $17 for 2019
$
41

$
51

Cumulative translation adjustment and other, net
(157
)
(148
)
Total accumulated other comprehensive loss
$
(116
)
$
(97
)