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Consolidated Balance Sheets (Parenthetical) (USD $) In Millions, except Per Share data, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Statement of Financial Position [Abstract]
Accounts receivable, allowance for doubtful accounts	$ 154us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent	$ 73us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent
Accumulated depreciation	5,959us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	6,278us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment
Accumulated amortization	$ 267us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization	$ 237us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
Common stock, par value (USD per share)	$ 1us-gaap_CommonStockParOrStatedValuePerShare	$ 1us-gaap_CommonStockParOrStatedValuePerShare
Common stock, shares authorized	250us-gaap_CommonStockSharesAuthorized	250us-gaap_CommonStockSharesAuthorized
Common stock, shares issued	110us-gaap_CommonStockSharesIssued	109us-gaap_CommonStockSharesIssued
Common stock, shares outstanding	78us-gaap_CommonStockSharesOutstanding	77us-gaap_CommonStockSharesOutstanding
Treasury stock shares	32us-gaap_TreasuryStockShares	32us-gaap_TreasuryStockShares

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Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.

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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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Face amount or stated value per share of common stock.

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

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Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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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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