Common and Preferred Stock (Details) (USD $) In Millions, except Share data, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Common: Par value $.25, 600,000,000 shares authorized
Outstanding - January 1	275,526,000us-gaap_CommonStockSharesOutstanding	285,829,000us-gaap_CommonStockSharesOutstanding	285,533,000us-gaap_CommonStockSharesOutstanding
Shares Issued For Benefit Plans In Period	2,284,000	3,319,000	4,695,000
Repurchase of common stock	(18,534,000)	(13,622,000)	(4,399,000)
Outstanding - December 31	259,276,000us-gaap_CommonStockSharesOutstanding	275,526,000us-gaap_CommonStockSharesOutstanding	285,829,000us-gaap_CommonStockSharesOutstanding
Treasury stock	36,869,000us-gaap_TreasuryStockShares	90,619,000us-gaap_TreasuryStockShares	80,316,000us-gaap_TreasuryStockShares
Issued - December 31	296,145,000us-gaap_CommonStockSharesIssued	366,145,000us-gaap_CommonStockSharesIssued	366,145,000us-gaap_CommonStockSharesIssued
Common Stock, par value and shares authorized
Common stock, par value per share	$ 0.25	$ 0.25	$ 0.25
Common stock shares authorized	600,000,000us-gaap_CommonStockSharesAuthorized	600,000,000us-gaap_CommonStockSharesAuthorized	600,000,000us-gaap_CommonStockSharesAuthorized
Payments For Repurchase Of Common Stock	$ 1,612	$ 1,003	$ 208
Shares of treasury stock retired	70,000,000us-gaap_TreasuryStockSharesRetired
Statement Line Items [Line Items]
Retirement of treasury stock	0
Preferred Stock [Abstract]
Preferred Stock, Shares Authorized	25,000,000us-gaap_PreferredStockSharesAuthorized	25,000,000us-gaap_PreferredStockSharesAuthorized	25,000,000us-gaap_PreferredStockSharesAuthorized
Preferred Stock, Par Value Per Share	$ 1	$ 1	$ 1
Preferred Stock, Shares Outstanding	0us-gaap_PreferredStockSharesOutstanding	0us-gaap_PreferredStockSharesOutstanding	0us-gaap_PreferredStockSharesOutstanding
Shareholders' Equity [Member]
Statement Line Items [Line Items]
Retirement of treasury stock	$ 0

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

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The cash outflow to reacquire common stock during the period.

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Face amount or stated value per share of preferred stock nonredeemable or redeemable solely at the option of the issuer.

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The maximum number of nonredeemable preferred shares (or preferred stock redeemable solely at the option of the issuer) permitted to be issued by an entity's charter and bylaws.

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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 shares issued during the period to an employee benefit plan, such as a defined contribution or defined benefit plan.

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Number of shares that have been repurchased during the period and have not been retired and are not held in treasury. Some state laws may govern the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock.

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Amount of decrease of par value, additional paid in capital (APIC) and retained earnings of common and preferred stock retired from treasury when treasury stock is accounted for under the cost method.

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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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Number of shares of common and preferred stock retired from treasury during the period.

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