XML 112 R97.htm IDEA: XBRL DOCUMENT v3.3.1.900
Benefit Obligation of Postretirement Benefit Plans (Detail) - Postretirement Benefit Plans - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Defined Benefit Plan Disclosure [Line Items]      
Accrued benefit obligation at January 1 $ 538 $ 422  
Service cost 15 13 $ 15
Interest cost 22 22 20
Benefits paid (10) (9)  
Currency (22) (11)  
Assumption changes (30) 75  
Actuarial (gains) / losses (2) 14  
Other   12  
Accrued benefit obligation at December 31 $ 511 $ 538 $ 422