Description of Business	3 Months Ended
Mar. 30, 2018
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Description of Business	. Description of Business L3 Technologies, Inc. (L3 Technologies, Inc. and, together with its subsidiaries, referred to herein as L3 or the Company) is a prime contractor in Intelligence, Surveillance and Reconnaissance (ISR) systems, aircraft sustainment (including modifications and fleet management of special mission aircraft), simulation and training, night vision and image intensification equipment and security and detection systems. L3 is also a leading provider of a broad range of communication, electronic and sensor systems used on military, homeland security and commercial platforms. The Company’s customers include the United States (U.S.) Department of Defense (DoD) and its prime contractors, U.S. Government intelligence agencies, the U.S. Department of Homeland Security (DHS), foreign governments, and domestic and foreign commercial customers. The Company has the following four reportable segments: (1) Electronic Systems, (2) Aerospace Systems, (3) Communication Systems and (4) Sensor Systems. Electronic Systems provides a broad range of products and services, including components, products, subsystems, systems and related services to military and commercial customers. These products and services serve niche markets, such as, aircraft simulation and training, power and distribution, cockpit avionics, airport security and precision weapons. Electronic Systems sells these products and services primarily to the DoD and select foreign governments. The Electronic Systems business areas are Link Training & Simulation, Power & Propulsion Systems, Commercial Aviation Solutions, Precision Engagement Systems and Security & Detection Systems. Aerospace Systems provides products and services for the global ISR and Command, Control and Communications (C³) markets, specializing in signals intelligence (SIGINT) and multi-intelligence platforms, including engineering, modernization and sustainment solutions for military and various government aircraft, ground support equipment and other platforms. These strategic and tactical products and services provide warfighters with the ability to detect, collect, identify, analyze and disseminate information from command centers, communication nodes and air defense systems for real-time situational awareness and response. Aerospace Systems sells these products and services primarily to the DoD and select foreign governments. The Aerospace Systems business areas are Mission Integration, MAS, Aerostructures and Advanced Systems. Communication Systems provides network and communication systems, secure communications products, radio frequency (RF) components, satellite communication terminals and space, microwave and telemetry products. These products include secure data links that are used to connect a variety of space, airborne, ground and sea-based communication systems and are used in transmission, processing, recording, monitoring and dissemination functions of these communication systems. Communication Systems sells these products and services primarily to the DoD and select foreign governments. The Communications Systems business areas are Broadband Communication Systems, Space & Power Systems and Advanced Communications. Sensor Systems provides a broad range of multi-domain ISR mission solutions from seabed to space for DoD, intelligence community, international, federal, civil and commercial customers. Major capabilities and mission solutions include networked warfighter systems, integrated ISR and targeting systems, space avionics and imaging payloads, Counter Unmanned Aircraft Systems mission solutions, integrated maritime mission solutions, directed energy, cyber and electronic warfare, special mission command & control, lightweight unmanned undersea vehicles, modeling & simulation and life cycle support. Sensor Systems sells these products and services primarily to the DoD and select foreign governments. The Sensor Systems business areas are Space & Sensor Systems, Airborne Sensor Systems, Warrior Sensor Systems, Maritime Sensor Systems, Intelligence & Mission Systems and Advanced Programs. Financial information with respect to the Company’s segments is included in Note 23 to the unaudited condensed consolidated financial statements and in Note 21 to the audited consolidated financial statements included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2017. On October 16, 2017, the Company’s Board of Directors approved a plan to explore strategic alternatives to sell or otherwise divest the Vertex Aerospace business. On May 1, 2018, the Company announced that it entered into a definitive agreement to sell its Vertex Aerospace, Crestview Aerospace and TCS businesses. The Company expects to complete the transaction in the summer of 2018, subject to customary closing conditions and regulatory approvals and record a gain on the sale of these businesses upon closing. The divestiture of the Vertex Aerospace business represents a strategic shift by the Company to exit the logistics solution and maintenance services business for military aircraft where the Company does not provide complex ISR systems integration and modification. The Vertex Aerospace business generated sales of $1.4 billion for the year ended December 31, 2017. The assets and liabilities and results of operations of the Vertex Aerospace business are reported as discontinued operations for all periods presented. All references made to financial data in this Quarterly Report on Form 10-Q are to the Company’s continuing operations, unless specifically noted. See Note 5 for additional information.

. Description of Business

L3 Technologies, Inc. (L3 Technologies, Inc. and, together with its subsidiaries, referred to herein as L3 or the Company) is a prime contractor in Intelligence, Surveillance and Reconnaissance (ISR) systems, aircraft sustainment (including modifications and fleet management of special mission aircraft), simulation and training, night vision and image intensification equipment and security and detection systems. L3 is also a leading provider of a broad range of communication, electronic and sensor systems used on military, homeland security and commercial platforms. The Company’s customers include the United States (U.S.) Department of Defense (DoD) and its prime contractors, U.S. Government intelligence agencies, the U.S. Department of Homeland Security (DHS), foreign governments, and domestic and foreign commercial customers.

The Company has the following four reportable segments: (1) Electronic Systems, (2) Aerospace Systems, (3) Communication Systems and (4) Sensor Systems.

Electronic Systems provides a broad range of products and services, including components, products, subsystems, systems and related services to military and commercial customers. These products and services serve niche markets, such as, aircraft simulation and training, power and distribution, cockpit avionics, airport security and precision weapons. Electronic Systems sells these products and services primarily to the DoD and select foreign governments. The Electronic Systems business areas are Link Training & Simulation, Power & Propulsion Systems, Commercial Aviation Solutions, Precision Engagement Systems and Security & Detection Systems.

Aerospace Systems provides products and services for the global ISR and Command, Control and Communications (C³) markets, specializing in signals intelligence (SIGINT) and multi-intelligence platforms, including engineering, modernization and sustainment solutions for military and various government aircraft, ground support equipment and other platforms. These strategic and tactical products and services provide warfighters with the ability to detect, collect, identify, analyze and disseminate information from command centers, communication nodes and air defense systems for real-time situational awareness and response. Aerospace Systems sells these products and services primarily to the DoD and select foreign governments. The Aerospace Systems business areas are Mission Integration, MAS, Aerostructures and Advanced Systems.

Communication Systems provides network and communication systems, secure communications products, radio frequency (RF) components, satellite communication terminals and space, microwave and telemetry products. These products include secure data links that are used to connect a variety of space, airborne, ground and sea-based communication systems and are used in transmission, processing, recording, monitoring and dissemination functions of these communication systems. Communication Systems sells these products and services primarily to the DoD and select foreign governments. The Communications Systems business areas are Broadband Communication Systems, Space & Power Systems and Advanced Communications.

Sensor Systems provides a broad range of multi-domain ISR mission solutions from seabed to space for DoD, intelligence community, international, federal, civil and commercial customers. Major capabilities and mission solutions include networked warfighter systems, integrated ISR and targeting systems, space avionics and imaging payloads, Counter Unmanned Aircraft Systems mission solutions, integrated maritime mission solutions, directed energy, cyber and electronic warfare, special mission command & control, lightweight unmanned undersea vehicles, modeling & simulation and life cycle support. Sensor Systems sells these products and services primarily to the DoD and select foreign governments. The Sensor Systems business areas are Space & Sensor Systems, Airborne Sensor Systems, Warrior Sensor Systems, Maritime Sensor Systems, Intelligence & Mission Systems and Advanced Programs.

Financial information with respect to the Company’s segments is included in Note 23 to the unaudited condensed consolidated financial statements and in Note 21 to the audited consolidated financial statements included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2017.

On October 16, 2017, the Company’s Board of Directors approved a plan to explore strategic alternatives to sell or otherwise divest the Vertex Aerospace business. On May 1, 2018, the Company announced that it entered into a definitive agreement to sell its Vertex Aerospace, Crestview Aerospace and TCS businesses. The Company expects to complete the transaction in the summer of 2018, subject to customary closing conditions and regulatory approvals and record a gain on the sale of these businesses upon closing. The divestiture of the Vertex Aerospace business represents a strategic shift by the Company to exit the logistics solution and maintenance services business for military aircraft where the Company does not provide complex ISR systems integration and modification. The Vertex Aerospace business generated sales of $1.4 billion for the year ended December 31, 2017. The assets and liabilities and results of operations of the Vertex Aerospace business are reported as discontinued operations for all periods presented.

All references made to financial data in this Quarterly Report on Form 10-Q are to the Company’s continuing operations, unless specifically noted. See Note 5 for additional information.