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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, 2018
Dec. 31, 2017
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets at beginning of year $ 588  
Fair value of plan assets at end of year 517 $ 588
Fair Value, Inputs, Level 3 [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets at beginning of year 61 53
Actual return on plan assets still held at reporting date (1) 2
Purchases, sales and settlements (2) (1)
Currency translation adjustments (3) 7
Fair value of plan assets at end of year $ 55 $ 61