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Employee Benefit Plans - Accumulated Benefit Obligation For Pension Benefit Plans (Detail) - Pension Benefits [Member] - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
United States [Member]    
Defined Contribution And Defined Benefit Plans [Line Items]    
Accumulated benefit obligation $ 330 $ 343
Non-United States Plans [Member]    
Defined Contribution And Defined Benefit Plans [Line Items]    
Accumulated benefit obligation $ 476 $ 507