Debt and Credit Facilities (Narrative) (Details) - USD ($)		12 Months Ended
	Aug. 25, 2015	Dec. 31, 2016	Dec. 31, 2015
Line of Credit Facility [Line Items]
Equity component of Senior Convertible Notes
Long-term maturities during 2017		$ 4,000,000
Long-term maturities during 2018		5,000,000
Long-term maturities during 2019		5,000,000
Long-term maturities during 2020		1,000,000,000
Long-term maturities during 2021		400,000,000
Revolving Credit Facility | 2014 Motorola Solutions Credit Agreement
Line of Credit Facility [Line Items]
Unsecured syndicated revolving credit facility		2,100,000,000
Letter of Credit | 2014 Motorola Solutions Credit Agreement
Line of Credit Facility [Line Items]
Unsecured syndicated revolving credit facility		450,000,000
Proceeds from lines of credit		0
Term Loan | New Credit Agreement
Line of Credit Facility [Line Items]
Debt instrument face principal amount		675,000,000
Silver Lake Partners | Convertible Debt | Senior Convertible Notes
Line of Credit Facility [Line Items]
Debt instrument face principal amount	$ 1,000,000,000
Debt instrument stated interest rate (percent)	2.00%
Debt instrument term	2 years
Volume weighted average share price (if exceeds) (in dollars per share)	$ 85
Consecutive trading days	10 days
Percent of notes, transfer or convert to shares of stock (up to)	20.00%
Convertible debt conversion ratio	0.0145985
Convertible debt conversion price (US$ per share)	$ 68.50
Value by which senior convertible notes exceeded their principal		202,000,000
Fair value inputs discount rate	2.40%
Convertible debt	$ 992,000,000
Debt unamortized discount	$ 8,000,000	$ 3,000,000	7,000,000
Amortization period		1 year
Contractual interest coupon and amortization of debt discount		$ 24,000,000	8,000,000
Equity component of Senior Convertible Notes		8,000,000
Long-term Debt | Accounting Standards Update 2015-03
Line of Credit Facility [Line Items]
Debt issuance costs, net		$ 25,000,000	$ 41,000,000