Amount of annualized dividend per outstanding share of common stock based on Board approved quarterly rate.

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- Definition

Common Stock, Dividend Rate, Increase (Decrease), Percentage

+ References

No definition available.

+ Details

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- Definition

Aggregate dividends declared during the period for each share of common stock outstanding.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 04

-Article 3

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 505

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.3-04)

-URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770

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- Definition

Amount of stock repurchase plan authorized.

+ References

No definition available.

+ Details

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- Definition

Total cost of shares repurchased divided by the total number of shares repurchased.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 505

-SubTopic 30

-Section 45

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6405813&loc=d3e23239-112655

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- Definition

Number of shares that have been repurchased during the period and are being held in treasury.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 04

-Article 3

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 505

-SubTopic 10

-Section 50

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 29, 30

-Article 5

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Background and Basis of Presentation (Narrative) (Details) (USD $)	3 Months Ended								6 Months Ended	12 Months Ended				18 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2014	Jun. 30, 2014	Dec. 31, 2013	Dec. 31, 2012	Sep. 30, 2014	Aug. 31, 2013	Apr. 30, 2013	Jul. 31, 2014
Dividends Payable [Line Items]
Repurchase of common stock, shares										22,452,599us-gaap_TreasuryStockSharesAcquired		16,652,913us-gaap_TreasuryStockSharesAcquired	34,860,000us-gaap_TreasuryStockSharesAcquired
Dividends declared (usd per share)	$ 0.52	$ 0.52	$ 0.48	$ 0.48	$ 0.48	$ 0.48	$ 0.44	$ 0.44	$ 0.52	$ 2.00	$ 0.48	$ 1.84	$ 1.70
Annualized dividend rate										$ 2.08mo_AnnualizedDividendRate
Treasury Stock Acquired, Average Cost Per Share										$ 41.79		$ 36.05	$ 32.00
Dividend Declared [Member] \| Common Stock [Member]
Dividends Payable [Line Items]
Increase in rate of dividend		8.30%
April 2013 Share Repurchase Program [Member]
Dividends Payable [Line Items]
Repurchase of common stock, shares														27,100,000
Treasury Stock Acquired, Average Cost Per Share														$ 36.97
Stock Repurchase Program, Authorized Amount															$ 1,000,000,000	$ 300,000,000
July 2014 Share Repurchase Program [Member]
Dividends Payable [Line Items]
Repurchase of common stock, shares									10,400,000
Treasury Stock Acquired, Average Cost Per Share									$ 46.41
Stock Repurchase Program, Authorized Amount																	$ 1,000,000,000