Debt and Credit Facilities (Narrative) (Details)		12 Months Ended
	Aug. 25, 2015 USD ($) $ / shares	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)
Line of Credit Facility [Line Items]
Debt Instrument face principal amount			$ 1,400,000,000
Loss from the extinguishment of long-term debt		$ 0	$ 37,000,000	$ 0
Long-term maturities during 2016		4,000,000
Long-term maturities during 2017		5,000,000
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
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
6.0% senior notes due 2017
Line of Credit Facility [Line Items]
Debt instrument stated interest rate (percent)			6.00%
Debt redemption aggregate purchase price			$ 400,000,000
Aggregate purchase price			456,000,000
Loss from the extinguishment of long-term debt			37,000,000
3.5% senior notes due 2021
Line of Credit Facility [Line Items]
Debt Instrument face principal amount			$ 400,000,000
Debt instrument stated interest rate (percent)		3.50%	3.50%
Net proceeds from issuance of debt			$ 393,000,000
4.0% senior notes due 2024
Line of Credit Facility [Line Items]
Debt Instrument face principal amount			$ 600,000,000
Debt instrument stated interest rate (percent)		4.00%	4.00%
Net proceeds from issuance of debt			$ 583,000,000
5.5% senior notes due 2044
Line of Credit Facility [Line Items]
Debt Instrument face principal amount			$ 400,000,000
Debt instrument stated interest rate (percent)		5.50%	5.50%
Net proceeds from issuance of debt			$ 394,000,000
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
Convertible debt conversion ratio	0.0145985
Convertible debt conversion price (US$ per share) | $ / shares	$ 68.50
Value by which senior convertible notes exceeded their principal		21,000,000
Fair value inputs discount rate	2.40%
Convertible debt	$ 992,000,000
Debt unamortized discount	$ 8,000,000	$ 7,000,000
Amortization period		2 years
Contractual interest coupon and amortization of debt discount		$ 8,000,000
Equity component of Senior Convertible Notes		$ 8,000,000