Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Millions	Mar. 29, 2020	Dec. 29, 2019
Current assets:
Allowances for doubtful accounts	$ 234	$ 226
Shareholders' equity:
Common stock, par value per share	$ 1.00	$ 1.00
Common stock, shares authorized	4,320,000,000	4,320,000,000
Common stock, shares issued	3,119,843,000	3,119,843,000
Treasury stock, shares	487,451,000	487,336,000