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Stock-Based Compensation Expense (Detail)
$ / shares in Units, $ in Millions
1 Months Ended 3 Months Ended
Mar. 18, 2020
shares
Feb. 29, 2020
shares
Oct. 31, 2018
$ / shares
shares
Jun. 30, 2018
$ / shares
shares
Mar. 31, 2020
USD ($)
installment
Mar. 31, 2019
USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Number of shares granted (in shares) | shares 167,060 208,268        
Share based compensation liability | $         $ 1  
Stock-based compensation expense | $         $ 7 $ 1
Restricted Stock Units (RSUs)            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Number of shares granted (in shares) | shares     8,000 60,000    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value | $ / shares     $ 47.59 $ 50.40    
Performance Shares Units | Officers and Employees            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Number of installment payments of employee related payables | installment         3