Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Millions	Mar. 31, 2019	Dec. 30, 2018
Current assets:
Allowances for doubtful accounts	$ 244	$ 248
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	464,207,000	457,519,000

A valuation allowance for trade and other receivables due to an Entity within one year (or the normal operating cycle, whichever is longer) that are expected to be uncollectible.

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