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Employee Benefit Plans - Amounts in Accumulated Other Comprehensive Income Expected to be Recognized as Components of Net Periodic Benefit Cost (Detail)
$ in Millions
Dec. 31, 2018
USD ($)
Pension  
Defined Benefit Plan Disclosure [Line Items]  
Net loss to be recognized in other comprehensive income $ 1
Postemployment  
Defined Benefit Plan Disclosure [Line Items]  
Net loss to be recognized in other comprehensive income $ 5