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Goodwill and Other Purchased Intangible Assets (Tables)
 12 Months Ended
Dec. 31, 2021
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, 2020 and 2021, were as follows:
$ in millionsAeronautics SystemsDefense SystemsMission SystemsSpace SystemsTotal
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 (1)
— (966)(181)(48)(1,195)
Other (2)
— 5 — — 5 
Balance as of December 31, 2020$3,467 $3,415 $5,881 $4,755 $17,518 
Other (2)
— (3)— — (3)
Balance as of December 31, 2021$3,467 $3,412 $5,881 $4,755 $17,515 
(1)Represents the reclassification of goodwill to assets of disposal group held for sale due to the divestiture of our IT and mission support services business that was pending as of December 31, 2020 (See Note 2).
(2)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 millions20212020
Gross customer-related and other intangible assets$3,361 $3,362 
Less accumulated amortization(2,783)(2,579)
Net customer-related and other intangible assets$578 $783 
Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block] As of December 31, 2021, the expected future amortization of purchased intangibles for each of the next five years is as follows:
$ in millions
2022$197 
202379 
202456 
202544 
202642