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Statements of Consolidated Changes in Equity (Parenthetical) (Common Stock [Member], USD $)
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12 Months Ended | ||
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Dec. 31, 2012
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Dec. 31, 2011
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Dec. 31, 2010
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Common Stock [Member]
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| Class of Stock [Line Items] | |||
| Common stock dividends per share | $ 2.16 | $ 0.84 | $ 0.51 |
| X | ||||||||||
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- Details
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| X | ||||||||||
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- Definition
Aggregate dividends paid during the period for each share of common stock outstanding. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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