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Components of Net Postretirement Health Care Costs (Detail) (Postretirement Benefit Plans, USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Defined Benefit Plan Disclosure [Line Items]      
Service cost $ 15 $ 35 $ 36
Interest cost 20 121 165
Net loss from experience differences 12 65 60
Prior service credit (12) (31) (32)
Other   29 [1]  
Net postretirement health care costs 35 84 66
Segment, Discontinued Operations
      
Defined Benefit Plan Disclosure [Line Items]      
Net postretirement health care costs   $ (135) $ (163)
[1] In 2012, we recorded a $23 million unfunded U.S. postretirement plan obligation related to long-term disability benefits.