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Interim Financial Information (Unaudited) - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 12 Months Ended
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2011
Sep. 30, 2011
Jun. 30, 2011
Mar. 31, 2011
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Quarterly Financial Information Disclosure [Abstract]                      
Non cash impairment charges for goodwill after tax $ 27       $ 291         $ 286  
Non cash impairment charges for goodwill pre-tax 42       450       42 450 698
Impairment of financial investment net of tax 3 1   10 3 13 21 11      
Impairment of financial investment before tax 4 2   16 4 19 33 17 2   34
After-tax charge (income) from litigation settlements 2   75 (1) 2   3        
Income from litigation settlements, before tax $ 3 $ 1 $ 75 $ (2) $ 3 $ 1 $ 5   $ 77 $ 9