Condensed Consolidated Statements of Comprehensive Income (Parenthetical) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 23, 2016	Sep. 25, 2015	Sep. 23, 2016	Sep. 25, 2015
Statement of Comprehensive Income [Abstract]
Income tax expense (benefit) on unrealized gains (losses) on hedging instruments		$ (3)	$ 4	$ (2)
Income taxes on amortization of net loss and prior service cost previously recognized	$ 4	$ 7	$ 13	18
Income tax expense on net gain arising during the period				$ 5