Consolidated Balance Sheets (Parenthetical) (USD $) In Millions, except Share data, unless otherwise specified	Dec. 28, 2014	Dec. 29, 2013
Current assets:
Allowances for doubtful accounts	$ 275	$ 333
Shareholders' equity:
Preferred Stock, Par or Stated Value Per Share	$ 0	$ 0
Preferred Stock, Shares Authorized	2,000,000us-gaap_PreferredStockSharesAuthorized	2,000,000us-gaap_PreferredStockSharesAuthorized
Preferred Stock, Shares Issued	0us-gaap_PreferredStockSharesIssued	0us-gaap_PreferredStockSharesIssued
Common stock, par value per share	$ 1.00	$ 1.00
Common stock, shares authorized	4,320,000,000us-gaap_CommonStockSharesAuthorized	4,320,000,000us-gaap_CommonStockSharesAuthorized
Common stock, shares issued	3,119,843,000us-gaap_CommonStockSharesIssued	3,119,843,000us-gaap_CommonStockSharesIssued
Treasury stock, shares	336,620,000us-gaap_TreasuryStockShares	299,215,000us-gaap_TreasuryStockShares

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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