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Defined Benefit Pension and Other Postretirement Plans - Additional Information (Detail)
$ in Millions
3 Months Ended
Mar. 31, 2017
USD ($)
Pension Benefits  
Defined Benefit Plan Disclosure [Line Items]  
Employer contributions $ 0
Other Pension Plan  
Defined Benefit Plan Disclosure [Line Items]  
Benefits paid 2
Other Benefits  
Defined Benefit Plan Disclosure [Line Items]  
Benefits paid $ 7