Goodwill and Other Purchased Intangible Assets (Tables)

12 Months Ended

Dec. 31, 2020

Goodwill and Intangible Assets Disclosure [Abstract]

Schedule of Goodwill [Table Text Block]

Changes in the carrying amounts of goodwill for the years ended December 31, 2019 and 2020, were as follows:

$ in millions	Aeronautics Systems		Defense Systems		Mission Systems		Space Systems		Total
Balance as of December 31, 2018	$	3,467	$	4,377	$	6,062	$	4,766	$	18,672
Acquisition of Orbital ATK(1)	—		—		—		37		37
Other(3)	—		(1)		—		—		(1)
Balance as of December 31, 2019	$	3,467	$	4,376	$	6,062	$	4,803	$	18,708
Reclassification to assets of disposal group held for sale(2)	—		(966)		(181)		(48)		(1,195)
Other(3)	—		5		—		—		5
Balance as of December 31, 2020	$	3,467	$	3,415	$	5,881	$	4,755	$	17,518

(1)Represents changes to goodwill resulting from measurement period adjustments recorded in 2019 associated with Orbital ATK’s purchase price allocation.

(2)Represents the reclassification of goodwill to assets of disposal group held for sale due to the pending divestiture of our IT and mission support services business (See Note 2).

(3)Other consists primarily of adjustments for foreign currency translation.

Schedule of Acquired Finite-Lived Intangible Assets by Major Class [Table Text Block]

Net customer-related and other intangible assets are as follows:

	December 31
$ in millions	2020		2019
Gross customer-related and other intangible assets	$	3,362	$	3,356
Less accumulated amortization	(2,579)		(2,316)
Net customer-related and other intangible assets	$	783	$	1,040

Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block]

As of December 31, 2020, the expected future amortization of purchased intangibles for each of the next five years is as follows:

$ in millions
2021	$	205
2022	197
2023	79
2024	56
2025	44