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Income Taxes - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2017
Oct. 01, 2016
Sep. 30, 2017
Oct. 01, 2016
Dec. 31, 2016
Income Tax Contingency [Line Items]          
Effective income tax rate 26.00% 18.00% 23.00% 22.00%  
Excess Tax Benefit From Share Based Compensation   $ 16   $ 34  
Reductions Credited To Income Tax Expense     $ 39    
Unrecognized tax benefits $ 56   56   $ 63
Projected additions to unrecognized tax benefits 5   5    
Unrecognized tax benefits that would affect the effective income tax rate 37   37    
Tax-related interest and penalties accrual 20   20    
Other current liabilities          
Income Tax Contingency [Line Items]          
Unrecognized tax benefits $ 8   $ 8