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Income Taxes (Narrative) (Details)
$ / shares in Units, kr in Millions, $ in Millions
3 Months Ended 12 Months Ended 48 Months Ended
Dec. 31, 2017
Apr. 03, 2020
USD ($)
$ / shares
Mar. 29, 2019
USD ($)
$ / shares
Dec. 21, 2017
Dec. 31, 2015
USD ($)
Dec. 16, 2019
DKK (kr)
Aug. 27, 2019
DKK (kr)
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 tax benefits, impact, amount   $ 27 $ 245          
Net tax benefits, impact, per diluted common share | $ / shares   $ 0.04 $ 0.34          
Net tax benefits, 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 2004-2009   $ 257           kr 1,800
Income tax examination, amount of tax assessments 2010-2012   156         kr 1,100  
Income tax examination, amount of tax assessments 2013-2015   $ 111       kr 767