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Basis of Presentation (Unaudited) (Tables)
6 Months Ended
Jun. 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 June 30Six Months Ended June 30
$ in millions, except per share data2021202020212020
Revenue$160 $125 $362 $261 
Operating income154 112 344 236 
Net earnings(1)
122 88 272 186 
Diluted earnings per share(1)
0.76 0.53 1.67 1.11 
(1)Based on a 21 percent statutory tax rate
Accumulated Other Comprehensive Loss The components of accumulated other comprehensive loss are as follows:
$ in millionsJune 30, 2021December 31, 2020
Unamortized prior service credit, net of tax expense of $2 for 2021 and $3 for 2020
$6 $10 
Cumulative translation adjustment and other, net(138)(138)
Total accumulated other comprehensive loss$(132)$(128)