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Summary of Significant Accounting Policies (Details) - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Jan. 01, 2019
Summary of Significant Accounting Policies [Line Items]        
Research and development expense $ 326 $ 287 $ 258  
Percentage of incurred costs billed 80.00%      
Cumulative Effect of New Accounting Principle in Period of Adoption   13    
Revenue Recognition [Abstract]        
Percentage of fixed-price type contracts 80.00%      
Performance-based Billings as Percent of Contract Price, Maximum 90.00%      
Accounting Estimates [Abstract]        
Performance obligations partially satisfied in prior periods $ 264      
Increase in operating income due to changes in contract estimates $ 213 $ 185 $ 149  
Increase in operating income due to changes in contract estimates, diluted (in dollars per share) $ 2.03 $ 1.49 $ 1.23  
Revenue from Contract with Customer [Abstract]        
Over time (cost-to-cost method) (percent) 74.00%      
Point in time (percent) 19.00%      
Output method (percent) 4.00%      
Billing method (percent) 3.00%      
Total (percent) 100.00%      
Accrued product warranty costs [Roll Forward]:        
Balance at January 1 $ 99 $ 109    
Acquisitions during this period 0 3    
Accruals for product warranties issued during the period 44 52    
Changes to accruals for product warranties existing before January 1 1 0    
Settlements made during the period (55) (66)    
Foreign currency translation adjustments (1) 1    
Balance at December 31 $ 88 99 $ 109  
Minimum [Member] | Buildings and Improvements [Member]        
Property, Plant and Equipment [Abstract]        
Estimated useful life 10 years      
Minimum [Member] | Machinery, Equipment, Furniture and Fixtures [Member]        
Property, Plant and Equipment [Abstract]        
Estimated useful life 3 years      
Maximum [Member] | Buildings and Improvements [Member]        
Property, Plant and Equipment [Abstract]        
Estimated useful life 40 years      
Maximum [Member] | Machinery, Equipment, Furniture and Fixtures [Member]        
Property, Plant and Equipment [Abstract]        
Estimated useful life 10 years      
Accounting Standards Update 2017-07 [Member]        
Summary of Significant Accounting Policies [Line Items]        
New accounting pronouncement or change in accounting principle, effect of change on operating income $ 11 11 1  
New Accounting pronouncement or change in accounting principle, effect of change on interest and other income, net $ (11) (11) $ (1)  
Accounting Standards Update 2014-09 [Member] | Retained Earnings [Member]        
Summary of Significant Accounting Policies [Line Items]        
Cumulative Effect of New Accounting Principle in Period of Adoption   13    
Sales Revenue, Net [Member] | Accounting Standards Update 2014-09 [Member]        
Summary of Significant Accounting Policies [Line Items]        
Cumulative Effect of New Accounting Principle in Period of Adoption   $ 380    
Subsequent Event [Member] | Accounting Standards Update 2016-02 [Member]        
Summary of Significant Accounting Policies [Line Items]        
Right-of-use asset       $ 650
Lease liability       $ 650