Quarterly report pursuant to Section 13 or 15(d)

Subsequent Event (Details)

v2.4.0.6
Subsequent Event (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Subsequent Event [Line Items]        
Income tax expense (benefit) $ 770 $ 1,201 $ 1,520 $ (2,117)