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Consolidated Balance Sheets (Parentheticals) (USD $)
In Millions, except Per Share data, unless otherwise specified |
Mar. 31, 2013
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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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Dec. 31, 2009
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|---|---|---|---|---|---|
| Statement of Financial Position [Abstract] | |||||
| Allowance for D/A | $ 75 | $ 74 | $ 79 | $ 66 | $ 81 |
| Common stock par value | $ 0.01 | $ 0.01 | $ 0.01 |
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- Definition
A valuation allowance for trade and other receivables due to an Entity within one year (or the normal operating cycle, whichever is longer) that are expected to be uncollectible. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Face amount or stated value of common stock per share; generally not indicative of the fair market value per share. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Details
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