Income Taxes (Narrative) (Details) DKK in Millions, $ in Millions			3 Months Ended		9 Months Ended		12 Months Ended	36 Months Ended
	Sep. 30, 2016 USD ($)	Dec. 10, 2013 DKK	Sep. 30, 2016	Oct. 02, 2015	Sep. 30, 2016 USD ($)	Oct. 02, 2015	Dec. 31, 2015	Dec. 31, 2012 DKK
Income Tax Examination [Line Items]
Effective income tax rate, percent			15.50%	16.30%	26.60%	14.80%
Federal statutory income tax rate, percent					35.00%		35.00%
Effective income tax rate reconciliation, early extinguishment of borrowings, percent			6.00%		1.00%
Effective income tax rate reconciliation, gain on sale of marketable equity securities, percent					1.40%
Net discrete tax expense (benefit), amount					$ 99
Effective income tax rate reconciliation, separation and other discrete items, ercent					5.20%
Effective income tax rate reconciliation, change in deferred tax assets valuation allowance, percent				(0.20%)		(1.20%)
Denmark, kroner | Foreign tax authority
Income Tax Examination [Line Items]
Income tax examination, amount of tax assessments | DKK		DKK 1,300
Income tax examination, amount of potential additional tax assessments | DKK								DKK 794
United States of America, dollars | Foreign tax authority
Income Tax Examination [Line Items]
Income tax examination, amount of tax assessments	$ 203
Income tax examination, amount of potential additional tax assessments	$ 120