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Components of Net Pension Cost (Parenthetical) (Detail) (USD $)
In Millions, unless otherwise specified
6 Months Ended 3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2014
2012-2014 Restructuring Program
Jun. 30, 2014
2012-2014 Restructuring Program
Jun. 30, 2013
2012-2014 Restructuring Program
Severance And Related Costs
Jun. 30, 2014
2012-2014 Restructuring Program
Severance And Related Costs
Jun. 30, 2013
2012-2014 Restructuring Program
Severance And Related Costs
Defined Benefit Plan Disclosure [Line Items]            
Settlement losses   $ 11 $ 24 $ 9 $ (3) $ 9
Gains due to routine settlement losses $ 4