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Acquisition of Orbital ATK Pro Forma Financial Information (Tables)
 12 Months Ended
Dec. 31, 2018
Business Combinations [Abstract]  
Business Acquisition, Pro Forma Information [Table Text Block]
The following table presents unaudited pro forma financial information prepared in accordance with Article 11 of Regulation S-X and computed as if Orbital ATK had been included in our results as of January 1, 2017:
 
Year Ended December 31
$ in millions, except per share amounts
2018
 
2017
Sales
$
32,319
 
 
$
30,634
 
Net earnings
3,417
 
 
2,938
 
Diluted earnings per share
19.57
 
 
16.73