Stockholders' Equity (Details) (USD $)	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Stockholders' Equity, Number of Shares, Par Value and Other Disclosures [Abstract]
Preferred stock, shares authorized	100,000us-gaap_PreferredStockSharesAuthorized	100,000us-gaap_PreferredStockSharesAuthorized
Preferred stock, par value per share	$ 100	$ 100
Common stock, shares authorized	500,000,000us-gaap_CommonStockSharesAuthorized	500,000,000us-gaap_CommonStockSharesAuthorized
Common stock, par value per share	$ 1.00	$ 1.00
Common stock, shares issued	255,892,502us-gaap_CommonStockSharesIssued	255,320,345us-gaap_CommonStockSharesIssued
Number of treasury shares held	92,880,644us-gaap_TreasuryStockNumberOfSharesHeld	85,413,416us-gaap_TreasuryStockNumberOfSharesHeld
Share Repurchases [Line Items]
Payments for Repurchase of Common Stock	$ 601,077,000	$ 457,871,000	$ 748,955,000
Shares repurchased	7,467,228.000us-gaap_TreasuryStockSharesAcquired	6,011,831.000us-gaap_TreasuryStockSharesAcquired	12,401,098.000us-gaap_TreasuryStockSharesAcquired
Average price per share for repurchased shares (in dollars per share)	$ 80.50	$ 76.16	$ 60.38
May 2012 Authorization [Member]
Share Repurchases [Line Items]
Number of shares authorized to be repurchased	10,000,000
Shares repurchased	3,870,248
Average price per share for repurchased shares (in dollars per share)	$ 79.71
Remaining number of shares authorized to be repurchased	38,041
January 2015 Authorization [Member]
Share Repurchases [Line Items]
Number of shares authorized to be repurchased	15,000,000
November 2012 Authorization [Member]
Share Repurchases [Line Items]
Authorized dollar amount for share repurchase program	1,000,000,000
Payments for Repurchase of Common Stock	$ 292,565,000
Shares repurchased	3,596,980
Average price per share for repurchased shares (in dollars per share)	$ 81.06
Shares repurchased in open market [Member]
Share Repurchases [Line Items]
Shares repurchased	7,467,228	6,005,880	12,314,795
Shares repurchased from holders of employee stock options [Member]
Share Repurchases [Line Items]
Shares repurchased	0	5,951	86,303

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Face amount or stated value per share of common stock.

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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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Amount of stock repurchase plan authorized.

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The remaining number of shares authorized to be repurchased by an entity's Board of Directors under a stock repurchase plan.

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Number of shares held for each class of treasury stock.

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