Consolidated Balance Sheets (Parentheticals) (USD $) In Millions, except Share data, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Current Assets:
Allowance for uncollectible accounts	$ 9	$ 11
Allowance for obsolescence	119	127
Property, Plant and Equipment [Abstract]
Accumulated depreciation and amortization	9,765	9,340
Other Assets:
Accumulated amortization	$ 797	$ 793
Stockholders' Equity:
Common stock, par value per share	$ 0.0001	$ 0.0001
Common stock, shares authorized	1,500,000,000us-gaap_CommonStockSharesAuthorized	1,500,000,000us-gaap_CommonStockSharesAuthorized
Common stock, shares issued	837,176,320us-gaap_CommonStockSharesIssued	845,048,310us-gaap_CommonStockSharesIssued
Treasury stock, shares	20,879,542us-gaap_TreasuryStockShares	19,790,077us-gaap_TreasuryStockShares

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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The amount of the valuation account as of the balance sheet date which reduces the carrying amount of airline related inventory (including expendable merchandise, goods, commodities, or supplies to be used primarily in air transport of passengers or freight) to net realizable value; takes into consideration such factors as market value, excessive quantities based on expected sales, technological obsolescence, and shrinkage.

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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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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.

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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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