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Acquisitions and Divestitures (Tables)
 9 Months Ended
Sep. 30, 2022
Acquisitions and Divestitures [Abstract]  
Business Acquisition, Pro Forma Information
The following unaudited consolidated pro forma summary has been prepared by adjusting the Company's historical data to give effect to the acquisition of Alion as if it had occurred on January 1, 2021.
Three Months Ended
September 30		Nine Months Ended
September 30
 
($ in millions, except per share amounts)2022Pro Forma 20212022Pro Forma 2021
Sales and service revenues$2,626 $2,532 $7,864 $7,687 
Net earnings$138 $142 $456 $416 
Basic earnings per share$3.44 $3.52 $11.37 $10.32 
Diluted earnings per share$3.44 $3.52 $11.37 $10.32