Basis of Presentation - Adoption Impact to Statements of Income (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Apr. 01, 2017
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Net sales	$ 1,468	$ 1,281
Gross margin	669	570
Selling, general and administrative expenses	279	244
Operating earnings	171	173
Net earnings before income taxes	140	120
Net earnings attributable to Motorola Solutions, Inc.	117	$ 77
Difference between Revenue Guidance in Effect before and after Topic 606 | Accounting Standards Update 2014-09
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Net sales	(15)
Gross margin	(15)
Selling, general and administrative expenses	(13)
Operating earnings	(2)
Net earnings before income taxes	(2)
Net earnings attributable to Motorola Solutions, Inc.	(2)
Calculated under Revenue Guidance in Effect before Topic 606
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Net sales	1,453
Gross margin	654
Selling, general and administrative expenses	266
Operating earnings	169
Net earnings before income taxes	138
Net earnings attributable to Motorola Solutions, Inc.	$ 115