Condensed Consolidated Balance Sheets (Parenthetical) (USD $)	Mar. 31, 2015	Dec. 31, 2014
Statement of Financial Position [Abstract]
Preferred Stock, par value	$ 0.01	$ 0.01
Preferred Stock, share authorized	100,000.0us-gaap_PreferredStockSharesAuthorized	100,000.0us-gaap_PreferredStockSharesAuthorized
Preferred Stock, share issued	0us-gaap_PreferredStockSharesIssued	0us-gaap_PreferredStockSharesIssued
Preferred Stock, share outstanding	0us-gaap_PreferredStockSharesOutstanding	0us-gaap_PreferredStockSharesOutstanding
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	3,200,000,000us-gaap_CommonStockSharesAuthorized	3,200,000,000us-gaap_CommonStockSharesAuthorized
Common stock, shares issued	1,693,000,000us-gaap_CommonStockSharesIssued	1,691,000,000us-gaap_CommonStockSharesIssued
Common stock, shares outstanding	1,127,000,000us-gaap_CommonStockSharesOutstanding	1,140,000,000us-gaap_CommonStockSharesOutstanding
Treasury stock, shares	565,000,000us-gaap_TreasuryStockShares	550,000,000us-gaap_TreasuryStockShares
Shares held in trust, shares	1,000,000	1,000,000

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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Number of common stock held in a trust that has been set up specifically to accumulate stock for the sole purpose of distribution to participating employees but not yet earned.

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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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Number of shares of common stock outstanding. Common stock represent the ownership interest in a corporation.

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Total number of nonredeemable preferred shares (or preferred stock redeemable solely at the option of the issuer) issued to shareholders (includes related preferred shares that were issued, repurchased, and remain in the treasury). May be all or portion of the number of preferred shares authorized. Excludes preferred shares that are classified as debt.

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Aggregate share number for all nonredeemable preferred stock (or preferred stock redeemable solely at the option of the issuer) held by stockholders. Does not include preferred shares that have been repurchased.

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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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