Income Taxes (Narrative) (Details) DKK in Millions, $ in Millions		3 Months Ended		6 Months Ended		12 Months Ended	36 Months Ended
	Jun. 30, 2017 USD ($)	Jun. 30, 2017 USD ($)	Jul. 01, 2016	Jun. 30, 2017 USD ($)	Jul. 01, 2016	Dec. 31, 2016	Dec. 31, 2012 DKK	Dec. 10, 2013 DKK
Income Tax Examination [Line Items]
Effective income tax rate, percent		13.60%	36.10%	15.40%	30.20%
Federal statutory income tax rate, percent				35.00%		35.00%
Effective income tax rate reconciliation, statute of limitations, audit settlements, restructuring, percent		(6.90%)
Effective income tax rate reconciliation, statute of limitations, audit settlements, restructuring, stock-based compensation, percent				5.10%
Effective income tax rate reconciliation, gain on sale of marketable equity securities, percent			15.10%
Effective income tax rate reconciliation, separation, gain on sale on marketable securities, percent					9.60%
Foreign tax authority
Income Tax Examination [Line Items]
Income tax examination, amount of tax assessments	$ 222	$ 222		$ 222				DKK 1,400
Income tax examination, amount of potential additional tax assessments	$ 131						DKK 853