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Income Taxes - Narrative (Details) - USD ($)
$ in Billions
 9 Months Ended
Sep. 30, 2018
Oct. 04, 2016
Income Taxes    
Operating loss carryforwards expected to expire $ 1.6  
Minimum    
Income Taxes    
Number of tax years open for state tax audit (in years) 3 years  
Maximum    
Income Taxes    
Number of tax years open for state tax audit (in years) 5 years  
Earliest Tax Year    
Income Taxes    
Open tax year 2005  
Latest Tax Year    
Income Taxes    
Open tax year 2014  
Domestic Tax Authority    
Income Taxes    
Operating loss carryforwards subject to limitation   $ 1.9
Domestic Tax Authority | Earliest Tax Year    
Income Taxes    
Open tax year 2015