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Employee Benefit Plans - Summary of Changes in Fair Value of Plan's Level Three Assets (Detail) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets at beginning of year $ 601  
Fair value of plan assets at end of year 543 $ 601
Fair Value, Inputs, Level 3 [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets at beginning of year 99 108
Actual return on plan assets still held at reporting date 5 3
Purchases, sales and settlements (50) 2
Currency translation adjustments (1) (14)
Fair value of plan assets at end of year $ 53 $ 99