XML 17 R121.htm IDEA: XBRL DOCUMENT v2.4.0.6
Pensions and Other Postretirement Benefits - Components of Net Periodic Benefit Cost (Detail) (Postretirement benefits [Member], USD $)
In Millions, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Postretirement benefits [Member]
       
Defined Benefit Plan Disclosure [Line Items]        
Service cost $ 1   $ 1  
Interest cost   1 2 3
Amortization of transition obligation 1 1 2 2
Net periodic pension cost (income) $ 2 $ 2 $ 5 $ 5