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Goodwill and Other Purchased Intangible Assets (Tables)
12 Months Ended
Dec. 31, 2019
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, 2018 and 2019, were as follows:
$ in millions
 
Aeronautics Systems
 
Defense Systems
 
Mission Systems
 
Space Systems
 
Total
Balance as of December 31, 2017
 
$
2,969

 
$
2,259

 
$
6,062

 
$
1,165

 
$
12,455

Acquisition of Orbital ATK
 
498

 
2,123

 

 
3,601

 
6,222

Other(1)
 

 
(5
)
 

 

 
(5
)
Balance as of December 31, 2018
 
$
3,467

 
$
4,377

 
$
6,062

 
$
4,766

 
$
18,672

Acquisition of Orbital ATK
 

 

 

 
37

 
37

Other(1)
 

 
(1
)
 

 

 
(1
)
Balance as of December 31, 2019
 
$
3,467

 
$
4,376

 
$
6,062

 
$
4,803

 
$
18,708

(1) 
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
 
2019
 
2018
Gross customer-related and other intangible assets
 
$
3,356

 
$
3,356

Less accumulated amortization
 
(2,316
)
 
(1,984
)
Net customer-related and other intangible assets
 
$
1,040

 
$
1,372


Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block] As of December 31, 2019, the expected future amortization of purchased intangibles for each of the next five years is as follows:
$ in millions
 
 
2020
 
$
262

2021
 
204

2022
 
197

2023
 
78

2024
 
55