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Components of Net Pension Cost (Parenthetical) (Detail) - Jun. 30, 2015 - USD ($)
$ in Millions
Total
Total
Severance and Related Costs    
Defined Benefit Plan Disclosure [Line Items]    
Pension curtailment losses $ (17) $ (17)
2014-2018 Restructuring Program    
Defined Benefit Plan Disclosure [Line Items]    
Non-cash settlements / adjustments (62) (140)
2014-2018 Restructuring Program | Severance and Related Costs    
Defined Benefit Plan Disclosure [Line Items]    
Non-cash settlements / adjustments $ (6) $ (6)