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Condensed Consolidated Balance Sheets (Parenthetical) (USD $) In Millions, except Share data, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Trade receivables, allowances	$ 63us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent	$ 66us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent
Other receivables, allowances	$ 93us-gaap_AllowanceForDoubtfulOtherReceivablesCurrent	$ 91us-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	370,308,929us-gaap_TreasuryStockShares	332,896,779us-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

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 4

-Article 5



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

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-Publisher FASB

-Name Accounting Standards Codification

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-Subparagraph (SX 210.5-02.4)

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X

- 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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

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X

- Definition

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

+ References

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X

- 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

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

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- Definition

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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