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Income Taxes (Narrative) (Details)
$ / shares in Units, kr in Millions, $ in Millions
3 Months Ended 12 Months Ended 36 Months Ended 48 Months Ended
Mar. 29, 2019
USD ($)
Dec. 31, 2017
Mar. 29, 2019
USD ($)
$ / shares
Dec. 31, 2018
Dec. 21, 2017
Dec. 31, 2012
DKK (kr)
Dec. 31, 2015
USD ($)
Dec. 10, 2013
DKK (kr)
Income Tax Examination [Line Items]                
Federal statutory income tax rate, percent   21.00% 21.00% 21.00% 35.00%      
Net discrete tax charges, impact, amount     $ 242          
Net discrete tax charges, impact, per diluted share | $ / shares     $ 0.34          
Net discrete tax charges, impact, percent     34.00%          
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 $ 253   $ 253         kr 1,700
Income tax examination, amount of potential additional tax assessments $ 149         kr 994