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Discontinued Operations (Summarized Financial Info) (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]    
Net sales $ 331 $ 1,050
Income before income taxes 2,715 144
Provision for income taxes 747 49
Income from discontinued operations after income taxes $ 1,968 $ 95