Consolidated Balance Sheets (Parentheticals) (USD $) In Millions, except Share data, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Current Assets:
Allowance for uncollectible accounts	$ 21	$ 23
Allowance for obsolescence	127	118
Property, Plant and Equipment [Abstract]
Accumulated depreciation and amortization	9,340	7,792
Other Assets:
Accumulated amortization	$ 793	$ 738
Stockholders' Equity:
Common stock, par value	$ 0.0001	$ 0.0001
Common stock, shares authorized	1,500,000,000us-gaap_CommonStockSharesAuthorized	1,500,000,000us-gaap_CommonStockSharesAuthorized
Common stock, shares issued	845,048,310us-gaap_CommonStockSharesIssued	869,484,981us-gaap_CommonStockSharesIssued
Treasury Stock, at cost, shares	19,790,077us-gaap_TreasuryStockShares	18,041,848us-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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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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