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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
Interim Reporting [Line Items]                      
Non cash impairment charges for goodwill after tax $ 27       $ 335         $ 330  
Non cash impairment charges for goodwill pre-tax 42       494       42 494 698
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