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Components of Net Pension Cost (Detail) (Pension Plans, USD $)
In Millions, unless otherwise specified
 3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
U.S. Pension Plans
    
Defined Benefit Plan Disclosure [Line Items]    
Service cost $ 15 $ 17
Interest cost 17 15
Expected return on plan assets (20) (17)
Net loss from experience differences 8 14
Prior service cost   1
Settlement losses 2 3
Net periodic benefit cost 22 33
Non-U.S. Pension Plans
    
Defined Benefit Plan Disclosure [Line Items]    
Service cost 44 43
Interest cost 97 89
Expected return on plan assets (123) (108)
Net loss from experience differences 27 35
Settlement losses 5  
Net periodic benefit cost $ 50 $ 59