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Basis of Presentation (Unaudited) (Tables)
3 Months Ended
Mar. 31, 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 March 31
$ in millions, except per share data20212020
Revenue$202 $136 
Operating income190 124 
Net earnings(1)
150 98 
Diluted earnings per share(1)
0.92 0.58 
(1)Based on a 21 percent statutory tax rate
Accumulated Other Comprehensive Loss The components of accumulated other comprehensive loss are as follows:
$ in millionsMarch 31, 2021December 31, 2020
Unamortized prior service credit, net of tax expense of $2 for 2021 and $3 for 2020
$8 $10 
Cumulative translation adjustment and other, net(139)(138)
Total accumulated other comprehensive loss$(131)$(128)