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Basis of Presentation (Recent Accounting Pronouncements) (Details) - USD ($)
$ in Millions
9 Months Ended
Oct. 01, 2016
Oct. 03, 2015
Dec. 31, 2015
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Increase in operating cash flows $ 652 $ 607  
Decrease in financing cash flows 191 2,171  
Accounting Standards Update 2015-03 | Long-term Debt      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Debt issuance costs presented as a component of long-term debt 31   $ 41
New Accounting Pronouncement, Early Adoption, Effect | Accounting Standards Update 2016-09      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Income tax benefit impact of adoption 5    
New Accounting Pronouncement, Early Adoption, Effect | Accounting Standards Update 2016-09, Statutory Tax Withholding Component      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Increase in operating cash flows 16 16  
Decrease in financing cash flows 16 $ 16  
New Accounting Pronouncement, Early Adoption, Effect | Accounting Standards Update 2016-09, Excess Tax Benefit Component      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Increase in operating cash flows 5    
Decrease in financing cash flows $ 3