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Benefit Obligation of Postretirement Benefit Plans (Detail) (Postretirement Benefit Plans, USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Postretirement Benefit Plans
     
Defined Benefit Plan Disclosure [Line Items]      
Accrued benefit obligation at January 1 $ 458 $ 3,453  
Service cost 15 35 36
Interest cost 20 121 165
Benefits paid (7) (142)  
Plan amendments (3) (51)  
Currency (7) 8  
Assumption changes (56) 519  
Actuarial (gains) / losses (4) 47  
Impact of Spin-Off   (3,561)  
Other 6 29  
Accrued benefit obligation at December 31 $ 422 $ 458 $ 3,453