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Employee Benefit Plans - Change in Benefit Obligation, Plan Assets and Funded Status of Defined Benefit Pension Plans (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets at beginning of year $ 543  
Fair value of plan assets at end of year 588 $ 543
Pension Benefits [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Benefit obligation at beginning of year 622 703
Service cost 1 5
Interest cost 20 25
Actuarial loss (gain) 6 42
Benefits paid (31) (30)
Exchange rate loss (gain) 30 (37)
Acquisitions (disposals)   2
Curtailments   (17)
Settlements (15) (71)
Other 1  
Benefit obligation at end of year 633 622
Fair value of plan assets at beginning of year 543 601
Actual return 57 60
Benefits paid (31) (30)
Company contributions 11 16
Exchange rate gain (loss) 24 (34)
Settlements (15) (71)
Acquisitions (disposals)   1
Other (1)  
Fair value of plan assets at end of year 588 543
Funded status (45) (79)
Accumulated benefit obligation at end of year 630 617
Postretirement Benefits [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Benefit obligation at beginning of year 92 90
Interest cost 3 3
Actuarial loss (gain) (17) (29)
Benefits paid (14) (16)
Participants contributions 2 2
Curtailments (4)  
Other   42
Benefit obligation at end of year 62 92
Benefits paid (14) (16)
Company contributions 12 14
Participants contributions 2 2
Other   (42)
Funded status $ (62) $ (92)