Goodwill and Other Intangible Assets (Tables)

9 Months Ended

Sep. 30, 2020

Goodwill and Intangible Assets Disclosure [Abstract]

Schedule of Goodwill [Table Text Block]

For the nine months ended September 30, 2020, the carrying amounts of goodwill changed as follows:

($ in millions)	Ingalls		Newport News		Technical Solutions		Total
Balance as of December 31, 2019	$	175	$	721	$	477	$	1,373
Acquisitions	—		—		310		310
Adjustments	—		—		(106)		(106)
Balance as of September 30, 2020	$	175	$	721	$	681	$	1,577