Consolidated Balance Sheets (Parenthetical) (USD $) In Millions, except Share data in Thousands, unless otherwise specified	Jun. 29, 2014	Dec. 29, 2013
Current assets:
Allowances for doubtful accounts	$ 295	$ 333
Shareholders' equity:
Common stock, par value per share	$ 1.00	$ 1.00
Common stock, shares authorized	4,320,000	4,320,000
Common stock, shares issued	3,119,843	3,119,843
Treasury stock, shares	297,264	299,215