Condensed Consolidated Statement of Comprehensive Income (Unaudited) (Parenthetical) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 27, 2014	Sep. 28, 2013	Sep. 27, 2014	Sep. 28, 2013
Statement of Comprehensive Income [Abstract]
Amortization of retirement benefit adjustments tax	$ 4	$ 9	$ 14	$ 28
Foreign currency translation adjustments tax	(1)	2	(5)	(4)
Net unrealized gain on securities tax			$ (2)	$ 0