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Consolidated Balance Sheets (Parenthetical) (USD $) In Millions, except Share data, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Trade receivables, allowances	$ 66us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent	$ 86us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent
Other receivables, allowances	$ 91us-gaap_AllowanceForDoubtfulOtherReceivablesCurrent	$ 73us-gaap_AllowanceForDoubtfulOtherReceivablesCurrent
Common Stock, no par value
Common stock, shares authorized	5,000,000,000us-gaap_CommonStockSharesAuthorized	5,000,000,000us-gaap_CommonStockSharesAuthorized
Common Stock, shares issued	1,996,537,778us-gaap_CommonStockSharesIssued	1,996,537,778us-gaap_CommonStockSharesIssued
Treasury stock, shares	332,896,779us-gaap_TreasuryStockShares	291,141,184us-gaap_TreasuryStockShares

X

- Definition

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.

+ References

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-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

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- Definition

A valuation allowance for doubtful other receivables due to an entity within one year (or the normal operating cycle, whichever is longer) that are expected to be uncollectible and not separately disclosed.

+ References

No definition available.

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X

- Definition

Face amount per share of no-par value common stock.

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X

- Definition

The maximum number of common shares permitted to be issued by an entity's charter and bylaws.

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- Definition

Total number of common shares of an entity that have been sold or granted to shareholders (includes common shares that were issued, repurchased and remain in the treasury). These shares represent capital invested by the firm's shareholders and owners, and may be all or only a portion of the number of shares authorized. Shares issued include shares outstanding and shares held in the treasury.

+ References

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Number of common and preferred shares that were previously issued and that were repurchased by the issuing entity and held in treasury on the financial statement date. This stock has no voting rights and receives no dividends.

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