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Employee Benefit Plans - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
1 Months Ended 3 Months Ended 6 Months Ended
Feb. 28, 2014
Jun. 30, 2014
Jun. 30, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Employer contribution to tax-qualified defined benefit pension plans   $ 61 $ 118
Number of days used to compute performance period average closing price of restricted stock units 20 days    
Minimum
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Percentage of pre-tax earnings paid for profit sharing plan     5.00%
Pre-tax profit excluding special items, profit sharing expense and share-based compensation program expense profit sharing threshold     $ 10
Maximum
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Percentage of pre-tax earnings paid for profit sharing plan     20.00%
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    
RSUs
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-Based Compensation, award granted 0.5    
Share-Based Compensation, vesting period 3 years    
Performance Shares
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-Based Compensation, vesting period 3 years    
Share-Based Compensation, award granted 0.6    
Share-Based Compensation, vesting date Dec. 31, 2016