v2.4.0.6
Quarterly financial data Quarterly financial data (Details) (USD $)
In Millions, except Per Share data, 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]                      
Product sales $ 4,337 $ 4,201 $ 4,200 $ 3,901 $ 3,907 $ 3,877 [1] $ 3,893 $ 3,618 $ 16,639 $ 15,295 $ 14,660
Gross profit from product sales 3,485 3,496 3,518 3,222 3,251 3,272 [1] 3,291 3,054      
Net income $ 788 $ 1,107 $ 1,266 $ 1,184 $ 934 $ 454 [1] $ 1,170 $ 1,125 $ 4,345 $ 3,683 $ 4,627
Earnings Per Share [Abstract]                      
Basic $ 1.03 $ 1.44 $ 1.63 $ 1.50 $ 1.09 $ 0.50 [1] $ 1.26 $ 1.21 $ 5.61 $ 4.07 $ 4.82
Diluted $ 1.01 $ 1.41 $ 1.61 $ 1.48 $ 1.08 $ 0.50 [1] $ 1.25 $ 1.20 $ 5.52 $ 4.04 $ 4.79
[1] We recorded a $780 million legal settlement charge ($705 million, net of tax) in connection with an agreement in principle to settle allegations related to our sales and marketing practices.