Revenue from Contracts with Customers - Disaggregation of Revenue (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Disaggregation of Revenue [Line Items]
Net Sales	$ 8,171	$ 7,414	$ 7,887
Direct
Disaggregation of Revenue [Line Items]
Net Sales	5,989	5,549	5,836
Indirect
Disaggregation of Revenue [Line Items]
Net Sales	2,182	1,865	2,051
LMR Communications
Disaggregation of Revenue [Line Items]
Net Sales	6,408	6,000	6,721
Video Security and Access Control
Disaggregation of Revenue [Line Items]
Net Sales	1,226	927	709
Command Center Software
Disaggregation of Revenue [Line Items]
Net Sales	537	487	457
North America
Disaggregation of Revenue [Line Items]
Net Sales	5,561	5,024	5,276
International
Disaggregation of Revenue [Line Items]
Net Sales	2,610	2,390	2,611
Products and Systems Integration
Disaggregation of Revenue [Line Items]
Net Sales	5,033	4,634	5,329
Products and Systems Integration | Direct
Disaggregation of Revenue [Line Items]
Net Sales	3,147	2,991	3,441
Products and Systems Integration | Indirect
Disaggregation of Revenue [Line Items]
Net Sales	1,886	1,643	1,888
Products and Systems Integration | LMR Communications
Disaggregation of Revenue [Line Items]
Net Sales	4,203	3,992	4,830
Products and Systems Integration | Video Security and Access Control
Disaggregation of Revenue [Line Items]
Net Sales	830	642	499
Products and Systems Integration | Command Center Software
Disaggregation of Revenue [Line Items]
Net Sales	0	0	0
Products and Systems Integration | North America
Disaggregation of Revenue [Line Items]
Net Sales	3,723	3,418	3,846
Products and Systems Integration | International
Disaggregation of Revenue [Line Items]
Net Sales	1,310	1,216	1,483
Software and Services
Disaggregation of Revenue [Line Items]
Net Sales	3,138	2,780	2,558
Software and Services | Direct
Disaggregation of Revenue [Line Items]
Net Sales	2,842	2,558	2,395
Software and Services | Indirect
Disaggregation of Revenue [Line Items]
Net Sales	296	222	163
Software and Services | LMR Communications
Disaggregation of Revenue [Line Items]
Net Sales	2,205	2,008	1,891
Software and Services | Video Security and Access Control
Disaggregation of Revenue [Line Items]
Net Sales	396	285	210
Software and Services | Command Center Software
Disaggregation of Revenue [Line Items]
Net Sales	537	487	457
Software and Services | North America
Disaggregation of Revenue [Line Items]
Net Sales	1,838	1,606	1,430
Software and Services | International
Disaggregation of Revenue [Line Items]
Net Sales	$ 1,300	$ 1,174	$ 1,128