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Income Taxes (Narrative) (Details)
$ / shares in Units, kr in Millions, $ in Millions
3 Months Ended 9 Months Ended 12 Months Ended 36 Months Ended 48 Months Ended
Dec. 31, 2017
Sep. 27, 2019
Sep. 28, 2018
USD ($)
$ / shares
Sep. 27, 2019
USD ($)
$ / shares
Sep. 28, 2018
USD ($)
$ / shares
Dec. 21, 2017
Dec. 31, 2015
USD ($)
Dec. 31, 2015
DKK (kr)
Dec. 31, 2012
USD ($)
Dec. 31, 2012
DKK (kr)
Dec. 31, 2015
USD ($)
Dec. 10, 2013
USD ($)
Dec. 10, 2013
DKK (kr)
Income Tax Examination [Line Items]                          
Federal statutory income tax rate, percent 21.00% 21.00% 21.00% 21.00% 21.00% 35.00%              
Net tax benefits, impact, amount     $ (23) $ 227 $ (9)                
Net tax benefits, impact, per diluted share | $ / shares     $ (0.03) $ 0.31 $ (0.01)                
Net tax benefits, impact, percent     (2.90%) 9.20%                  
Income tax examination, proposed adjustments to taxable income                     $ 2,700    
Foreign tax authority                          
Income Tax Examination [Line Items]                          
Income tax examination, amount of tax assessments                       $ 256 kr 1,700
Income tax examination, amount of potential additional tax assessments             $ 108 kr 735 $ 152 kr 1,000