Business Changes and Developments (Details) (USD $) In Billions, except Per Share data	Mar. 18, 2011
Business Changes and Developments (Numeric) [Abstract]
Stock repurchase program amount authorized for repurchase common stock	$ 15.0
Stock repurchase program superseded amount authorized for repurchase common stock	$ 10.0
Common stock [Member]
Business Changes and Developments (Numeric) [Abstract]
Dividend Rate Per Share Before Adjustment	$ 0.05
Dividends Payable, Amount Per Share	$ 0.25

Business Changes and Developments Numeric.

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- Definition

The per share dividend rate in effect before an annouced adjustment.

+ Details

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- Definition

Description of the Board of Directors authorized amount of common stock to repurchase under the stock repurchase program.

+ Details

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- Definition

Description of the Board of Directors prior superceeded authorized amount of common stock to repurchase under the stock repurchase program.

+ Details

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- Definition

The per share amount of a dividend declared, but not paid, as of the financial reporting date.

+ References

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 95

-Paragraph 32

+ Details

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