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Basis of Presentation (Unaudited) (Tables)
9 Months Ended
Sep. 30, 2021
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 30Nine Months Ended September 30
$ in millions, except per share data2021202020212020
Revenue$116 $124 $478 $385 
Operating income109 123 453 359 
Net earnings(1)
86 97 358 284 
Diluted earnings per share(1)
0.54 0.58 2.21 1.69 
(1)Based on a 21 percent statutory tax rate
Accumulated Other Comprehensive Loss The components of accumulated other comprehensive loss are as follows:
$ in millionsSeptember 30, 2021December 31, 2020
Unamortized prior service credit, net of tax expense of $1 for 2021 and $3 for 2020
$4 $10 
Cumulative translation adjustment and other, net(144)(138)
Total accumulated other comprehensive loss$(140)$(128)