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Income Taxes (Source of Income (Loss) Before Income Taxes) (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Sources of Income (Loss) Before Income Taxes      
Income from continuing operations before income taxes $ 1,861 $ 1,668 $ 1,479
Discontinued operations before income taxes (2,235) (1,931) 191
Income (loss) before income tax $ (374) $ (263) $ 1,670