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Debt, Outstanding Senior Subordinated Notes (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Outstanding Senior Note Terms [Abstract]      
Net Cash Proceeds $ 0 $ 547 $ 0
Senior Notes Redemption [Abstract]      
Debt Retirement Charge 0 (7) (1)
Cash payments of senior notes $ 0 856 297
3.95% Senior Notes due 2016 [Member]      
Outstanding Senior Note Terms [Abstract]      
Redemption price as percentage of principal amount 101.475%    
Senior Notes due Nov. 15, 2016    
Senior Notes Redemption [Abstract]      
Redemption Date [1] May 20, 2016    
Maturity date Nov. 15, 2016    
Redemption amount [1] $ 300    
Principal Amount 200    
Debt Retirement Charge [1] 5    
Redemption cash payments [1] 305    
Cash payments of senior notes $ 200    
1.50% Senior Notes due 2017 [Member]      
Outstanding Senior Note Terms [Abstract]      
Redemption price as percentage of principal amount 100.323%    
Senior Notes Redemption [Abstract]      
Redemption Date [2] Dec. 30, 2016    
Redemption amount [2] $ 350    
Debt Retirement Charge [2] 2    
Redemption cash payments [2] $ 351    
5.20% Senior Notes due 2019 [Member]      
Outstanding Senior Note Terms [Abstract]      
Date of Issuance Oct. 02, 2009    
Amount Issued $ 1,000    
Discount [3] 4    
Net Cash Proceeds $ 987    
Effective Interest Rate 5.25%    
Redemption at Treasury Rate [4],[5] 30.00%    
4.75% Senior Notes due 2020 [Member]      
Outstanding Senior Note Terms [Abstract]      
Date of Issuance May 21, 2010    
Amount Issued $ 800    
Discount [3] 3    
Net Cash Proceeds $ 790    
Effective Interest Rate 4.79%    
Redemption at Treasury Rate [4],[5] 25.00%    
4.95% Senior Notes due 2021 [Member]      
Outstanding Senior Note Terms [Abstract]      
Date of Issuance Feb. 07, 2011    
Amount Issued $ 650    
Discount [3] 4    
Net Cash Proceeds $ 639    
Effective Interest Rate 5.02%    
Redemption at Treasury Rate [4],[5] 25.00%    
Senior Notes due Nov. 15, 2020    
Senior Notes Redemption [Abstract]      
Maturity date Nov. 15, 2020    
3.95% Senior Notes due 2024 [Member]      
Outstanding Senior Note Terms [Abstract]      
Date of Issuance May 28, 2014    
Amount Issued $ 650    
Discount [3] 3    
Net Cash Proceeds $ 641    
Effective Interest Rate 4.02%    
Redemption at Treasury Rate [4],[5] 20.00%    
Senior Notes Redemption [Abstract]      
Tender date Dec. 22, 2015    
Tender amount $ 300    
Debt Retirement Charge 1    
Tender cash payments $ 297    
3.85% Senior Notes due 2026 [Member]      
Outstanding Senior Note Terms [Abstract]      
Date of Issuance Dec. 05, 2016    
Amount Issued $ 550    
Discount [3] 3    
Net Cash Proceeds $ 542    
Effective Interest Rate 3.91%    
Redemption at Treasury Rate [4],[5] 25.00%    
L3 Technologies [Member]      
Outstanding Senior Note Terms [Abstract]      
Discount $ 7 8  
Net Cash Proceeds   547  
Redemption price as percentage of principal amount 101.00%    
Senior Notes Redemption [Abstract]      
Principal Amount $ 3,350 3,350  
Debt Retirement Charge   (7) (1)
Cash payments of senior notes   $ 856 $ 297
L3 Technologies [Member] | Minimum [Member]      
Outstanding Senior Note Terms [Abstract]      
Redemption price as percentage of principal amount 100.00%    
L3 Technologies [Member] | 3.95% Senior Notes due 2016 [Member]      
Outstanding Senior Note Terms [Abstract]      
Interest rate on senior notes 3.95%    
L3 Technologies [Member] | 1.50% Senior Notes due 2017 [Member]      
Outstanding Senior Note Terms [Abstract]      
Interest rate on senior notes 1.50%    
L3 Technologies [Member] | 5.20% Senior Notes due 2019 [Member]      
Outstanding Senior Note Terms [Abstract]      
Interest rate on senior notes 5.20%    
L3 Technologies [Member] | 4.75% Senior Notes due 2020 [Member]      
Outstanding Senior Note Terms [Abstract]      
Interest rate on senior notes 4.75%    
L3 Technologies [Member] | 4.95% Senior Notes due 2021 [Member]      
Outstanding Senior Note Terms [Abstract]      
Interest rate on senior notes 4.95%    
L3 Technologies [Member] | 3.95% Senior Notes due 2024 [Member]      
Outstanding Senior Note Terms [Abstract]      
Interest rate on senior notes 3.95%    
L3 Technologies [Member] | 3.95% Senior Notes due 2024 [Member] | Minimum [Member]      
Outstanding Senior Note Terms [Abstract]      
Senior Notes due Feb. 28, 2024    
Senior Notes Redemption [Abstract]      
Maturity date Feb. 28, 2024    
L3 Technologies [Member] | 3.85% Senior Notes due 2026 [Member]      
Outstanding Senior Note Terms [Abstract]      
Interest rate on senior notes 3.85%    
L3 Technologies [Member] | 3.85% Senior Notes due 2026 [Member] | Minimum [Member]      
Outstanding Senior Note Terms [Abstract]      
Senior Notes due Sep. 15, 2026    
Senior Notes Redemption [Abstract]      
Maturity date Sep. 15, 2026    
[1] The 3.95% Senior Notes due 2016 were redeemed at a price equal to 101.475% of the principal amount thereof, plus accrued and unpaid interest. Interest ceased to accrue on and after May 20, 2016, and the only remaining right of holders of such Notes was to receive payment of the redemption price and accrued interest.
[2] The 1.50% Senior Notes due 2017 were redeemed at a price equal to 100.323% of the principal amount thereof, plus accrued and unpaid interest to the redemption date. Interest ceased to accrue on and after the redemption date.
[3] Bond discounts are recorded as a reduction to the principal amount of the notes and are amortized as interest expense over the term of the notes.
[4] The Senior Notes maturing in 2019 and 2020 may be redeemed at any time prior to their maturity and the Senior Notes maturing in 2021, 2024 and 2026 may be redeemed at any time prior to November 15, 2020, February 28, 2024 and September 15, 2026, respectively, (three months prior to their maturity) at the option of L3, in whole or in part, at a redemption price equal to the greater of: (1) 100% of the principal amount, or (2) the present value of the remaining principal and interest payments discounted to the date of redemption, on a semi-annual basis, at the Treasury Rate (as defined in the indentures governing the Senior Notes), plus the spread indicated in the table above. In addition, if the Senior Notes maturing in 2021, 2024 and 2026 are redeemed at any time on or after November 15, 2020, February 28, 2024 and September 15, 2026, respectively, the redemption price would be equal to 100% of the principal amount.
[5] Upon the occurrence of a change in control (as defined in the indentures governing the Senior Notes), each holder of the notes will have the right to require L3 to repurchase all or any part of such holder's notes at an offer price in cash equal to 101% of the aggregate principal amount plus accrued and unpaid interest, if any, to the date of purchase.