Income Taxes (Narrative) (Details) DKK in Millions, $ in Millions		3 Months Ended		9 Months Ended		12 Months Ended	36 Months Ended
	Sep. 29, 2017 USD ($)	Sep. 29, 2017 USD ($)	Sep. 30, 2016	Sep. 29, 2017 USD ($)	Sep. 30, 2016	Dec. 31, 2016	Dec. 31, 2012 DKK	Dec. 10, 2013 DKK
Income Tax Examination [Line Items]
Effective income tax rate, percent		21.60%	15.50%	17.70%	26.60%
Federal statutory income tax rate, percent				35.00%		35.00%
Effective income tax rate reconciliation, statute of limitations, audit settlements, restructuring, stock-based compensation, percent				3.30%
Effective income tax rate reconciliation early extinguishment of borrowings, percent			(6.00%)		(1.00%)
Effective income tax rate reconciliation, repatriation of earnings and legal entity realignments associated with the separation and gain from sale of marketable equity securities, percent					6.60%
Foreign tax authority
Income Tax Examination [Line Items]
Income tax examination, amount of tax assessments	$ 235	$ 235		$ 235				DKK 1,500
Income tax examination, amount of potential additional tax assessments	$ 139						DKK 874