Income Taxes (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 28, 2014	Jun. 29, 2013	Jun. 28, 2014	Jun. 29, 2013	Dec. 28, 2013
Income Tax Disclosure [Abstract]
Unrecognized tax benefits	$ 321		$ 321		$ 315
Accrued interest and penalties	40		40		37
Effective Income Tax Rate Reconciliation, Percent	8.20%	(8.10%)	13.40%	8.40%
Unusual or Infrequent Item, Net (Gain) Loss	$ 82		$ 118
Effective Income Tax Rate Reconciliation, Other Adjustments, Percent	10.10%	30.70%	5.90%	9.90%
Effective Income Tax Rate Reconciliation, Tax Credit, Research, Percent	(1.10%)		(1.20%)	3.10%