Debt and Credit Facilities (Details)	1 Months Ended		3 Months Ended		6 Months Ended
	May 31, 2019 USD ($)	Feb. 28, 2018 USD ($)	Jun. 29, 2019 USD ($) $ / shares	Mar. 31, 2018 USD ($)	Jun. 29, 2019 USD ($) $ / shares	Dec. 31, 2018 USD ($)
U.S. | Pension Benefit Plan
Debt Instrument [Line Items]
Defined benefit plan contributions		$ 500,000,000
Line of Credit | Revolving Credit Facility | 2017 Motorola Solutions Credit Agreement
Debt Instrument [Line Items]
Line of credit facility borrowing capacity			$ 2,200,000,000		$ 2,200,000,000
Proceeds from line of credit				$ 400,000,000
Line of Credit | Letter of Credit | 2017 Motorola Solutions Credit Agreement
Debt Instrument [Line Items]
Line of credit facility borrowing capacity			500,000,000		500,000,000
Fronting commitment sub-limit			450,000,000		$ 450,000,000
Senior Notes | 4.6% senior notes due 2028
Debt Instrument [Line Items]
Debt instrument face amount		$ 500,000,000				$ 200,000,000
Interest rate		4.60%
Proceeds from debt, net		$ 497,000,000				$ 196,000,000
Senior Notes | 4.6% senior notes due 2029
Debt Instrument [Line Items]
Debt instrument face amount	$ 650,000,000
Interest rate	4.60%
Proceeds from debt, net	$ 645,000,000
Repurchased face amount	614,000,000
Repurchase amount paid	$ 654,000,000
Interest expense			3,000,000
Loss on repurchase of debt			$ 43,000,000
Term Loan | Term Loan due 2021
Debt Instrument [Line Items]
Debt instrument face amount				$ 400,000,000
Weighted average interest rate			3.72%		3.74%
Additional borrowings available			$ 0		$ 0
Convertible Notes | 2.0% Senior Convertible Notes due 2020
Debt Instrument [Line Items]
Debt instrument face amount			$ 800,000,000		$ 800,000,000
Interest rate			2.00%		2.00%
Conversion rate					0.0148968
Effective conversion price of convertible shares (in US$ per share) | $ / shares			$ 67.13		$ 67.13
If-converted value in excess of principal					$ 1,100,000,000