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Stock-Based Compensation Plans - Additional Information (Detail) (USD $)
In Millions, except Share data, unless otherwise specified
3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Aggregate number of shares to be issued 15,450,000  
Number of shares available for future grants 816,145  
Stock-based compensation expense recognized $ 9 $ 10
Unrecognized compensation costs related to non-vested stocks $ 38  
Weighted average period for recognizing non-vested stock based compensation costs 12 months  
Total Shareholder Return (TSR) Performance Based Restricted Stock [Member]
   
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Share-based compensation plans, award vesting period 3 years  
Total Shareholder Return (TSR) Performance Based Restricted Stock [Member] | Minimum
   
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Vesting of performance awards as percentage to target award 0.00%  
Total Shareholder Return (TSR) Performance Based Restricted Stock [Member] | Maximum
   
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Vesting of performance awards as percentage to target award 200.00%  
Return On Capital Employed (ROCE) Performance Based Restricted Stock [Member]
   
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Performance Period Weighting Year 1 20.00%  
Performance Period Weighting Year 2 30.00%  
Performance Period Weighting Year 3 50.00%  
Share-based compensation plans, award vesting period 3 years  
Return On Capital Employed (ROCE) Performance Based Restricted Stock [Member] | Minimum
   
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Vesting of performance awards as percentage to target award 0.00%  
Return On Capital Employed (ROCE) Performance Based Restricted Stock [Member] | Threshold [Member]
   
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Vesting of performance awards as percentage to target award 50.00%  
Return On Capital Employed (ROCE) Performance Based Restricted Stock [Member] | Target [Member]
   
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Vesting of performance awards as percentage to target award 100.00%  
Return On Capital Employed (ROCE) Performance Based Restricted Stock [Member] | Maximum
   
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Vesting of performance awards as percentage to target award 200.00%