v3.6.0.2
Postretirement Benefit Plans - Summary of Changes in Pension Benefit Obligations and Defined-Benefit Pension Plan Assets (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Pension Plans, Postretirement and Other Employee Benefits [Line Items]      
Service cost $ 17 $ 12 $ 10
Interest cost 14 11 13
Fair value of plan assets at end of year 172    
Accumulated Other Comprehensive Income (Loss) [Member]      
Pension Plans, Postretirement and Other Employee Benefits [Line Items]      
Total AOCI at beginning of year 42 70  
Net actuarial loss (gain) 54 (21)  
Exchange rate differences (5) (7)  
Total AOCI at end of year 91 42 70
Projected Benefit Obligation [Member]      
Pension Plans, Postretirement and Other Employee Benefits [Line Items]      
Projected benefit obligation at beginning of year 561 447  
Service cost 17 12  
Interest cost 14 11  
Actuarial (gains) and losses 53 (18)  
Curtailments and settlements (15) (16)  
Benefits paid (21) (14)  
Pension liabilities held-for-sale (28)    
Benefit obligation assumed in acquisitions   177  
Exchange rate differences (17) (38)  
Projected benefit obligation at end of year 564 561 447
Plan Assets [Member]      
Pension Plans, Postretirement and Other Employee Benefits [Line Items]      
Fair value of plan assets at beginning of year 190 157  
Actual return on plan assets 3 7  
Employer contributions 21 10  
Curtailments and settlements (15) (12)  
Benefits paid (21) (14)  
Pension assets held-for-sale (2)    
Plan assets acquired in acquisitions   56  
Exchange rate differences (4) (14)  
Fair value of plan assets at end of year 172 190 $ 157
Funded Plans with Assets Less than Accumulated Benefit Obligation [Member]      
Pension Plans, Postretirement and Other Employee Benefits [Line Items]      
Funded status (392) (371)  
Classification of Funded Status [Member]      
Pension Plans, Postretirement and Other Employee Benefits [Line Items]      
Prepaid pension cost within other non-current assets   4  
Accrued pension cost within other non-current liabilities (380) (368)  
Accrued pension cost within accrued liabilities (12) (7)  
Funded status (392) (371)  
Accumulated Benefit Obligation [Member]      
Pension Plans, Postretirement and Other Employee Benefits [Line Items]      
Accumulated benefit obligations 524 518  
Plans with Assets Less Than Accumulated Benefit Obligation [Member]      
Pension Plans, Postretirement and Other Employee Benefits [Line Items]      
Fair value of plan assets, Funded plans 171 73  
Accumulated benefit obligations, Funded plans 327 209  
Projected benefit obligations, Funded plans 357 243  
Accumulated benefit obligations, Unfunded plans 195 196  
Projected benefit obligations, Unfunded plans $ 204 $ 204