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Employee Benefit Plans - Additional Information (Detail)
shares in Millions, $ in Millions
3 Months Ended
Mar. 31, 2016
USD ($)
shares
Pension Benefits  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Employer contribution to tax-qualified defined benefit pension plans | $ $ 80
Minimum  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Percentage of pre-tax earnings paid for profit sharing plan 5.00%
Maximum  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Percentage of pre-tax earnings paid for profit sharing plan 20.00%
RSUs  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Number of days used to compute performance period average closing price of restricted stock units 20 days
Share-Based Compensation, award granted 0.8
Share-Based Compensation, vesting period 3 years
Restricted Stock  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Share-Based Compensation, award granted 0.3
Share-Based Compensation, vesting period 3 years
Performance Shares  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Number of days used to compute performance period average closing price of restricted stock units 20 days
Share-Based Compensation, award granted 0.6
Share-Based Compensation, vesting period 3 years
Share-Based Compensation, vesting date Dec. 31, 2018