Acquisitions and Divestitures (Tables)

12 Months Ended

Dec. 31, 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, 2020.

	Year Ended		Pro Forma (Unaudited)
	December 31		Year Ended December 31
($ in millions, except per share amounts)	2022		2021		2020
Sales and service revenues	$	10,676	$	10,364	$	10,453
Net earnings	$	579	$	539	$	648
Basic earnings per share	$	14.44	$	13.37	$	15.96
Diluted earnings per share	$	14.44	$	13.37	$	15.96