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Intangible Assets and Goodwill (Acquisitions) (Details)
$ in Millions
2 Months Ended 12 Months Ended
Feb. 19, 2016
USD ($)
Feb. 19, 2016
GBP (£)
Mar. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
acquisition
Apr. 02, 2016
USD ($)
Business Acquisition [Line Items]          
Goodwill       $ 420 $ 590
Two Public Safety Software-Based Solutions          
Business Acquisition [Line Items]          
Number of businesses acquired | acquisition       2  
Aggregate purchase price       $ 50  
Goodwill       31  
Identifiable intangible assets recognized       22  
Acquired liabilities       $ 3  
Guardian Digital Communications Limited (GDCL)          
Business Acquisition [Line Items]          
Aggregate purchase price $ 1,000 £ 698,000,000      
Goodwill 170        
Consideration transferred, excluding third party debt paid and liabilities assumed | £   1      
Deferred cash payment | £   £ 64,000,000      
Net sale from operations of Airwave     $ 61    
Net earnings from operations of Airwave     $ 3    
Consideration transfered $ 1,100        
Useful life of intangibles 7 years 7 years      
Discount rate used to calculate net present value 4.20% 4.20%      
Customer Relationships | Guardian Digital Communications Limited (GDCL)          
Business Acquisition [Line Items]          
Acquired intangible assets $ 602        
Trade Names | Guardian Digital Communications Limited (GDCL)          
Business Acquisition [Line Items]          
Acquired intangible assets $ 29        
Other Intangible Assets | Two Public Safety Software-Based Solutions          
Business Acquisition [Line Items]          
Identifiable intangible assets recognized         3
Technology-Based Intangible Assets | Two Public Safety Software-Based Solutions          
Business Acquisition [Line Items]          
Identifiable intangible assets recognized         11
Customer Relationships | Two Public Safety Software-Based Solutions          
Business Acquisition [Line Items]          
Identifiable intangible assets recognized         $ 8
Minimum | Two Public Safety Software-Based Solutions          
Business Acquisition [Line Items]          
Period of amortization for assets acquired in acquisition       5 years  
Maximum | Two Public Safety Software-Based Solutions          
Business Acquisition [Line Items]          
Period of amortization for assets acquired in acquisition       10 years