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Pension and Other Postretirement Benefits - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
 1 Months Ended 12 Months Ended 5 Months Ended 12 Months Ended
Jan. 31, 2011
Dec. 31, 2012
Y
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Dec. 31, 2008
Dec. 31, 2012
Subsequent Event [Member]
Dec. 31, 2012
Maximum [Member]
Dec. 31, 2008
Maximum [Member]
Dec. 31, 2012
Minimum [Member]
Dec. 31, 2012
Pension Benefits [Member]
Y
Dec. 31, 2012
Foreign Pension Plans, Defined Benefit [Member]
Y
Dec. 31, 2012
10-Year Moving Average [Member]
Y
Dec. 31, 2012
20-Year Moving Average [Member]
Y
Dec. 31, 2008
20-Year Moving Average [Member]
Minimum [Member]
May 31, 2010
United Steelworkers Labor Agreement [Member]
Dec. 31, 2010
United Steelworkers Labor Agreement [Member]
Jun. 24, 2010
United Steelworkers Labor Agreement [Member]
Employees
Location
Y
Dec. 31, 2009
United Steelworkers Labor Agreement [Member]
Defined Benefit Plan Disclosure [Line Items]                                      
Term of labor agreement, in years                                   4  
Number of employees covered by labor agreement                                   5,400  
Number of locations affected by labor agreement                                   11  
Pretax costs related to preparation for and ratification of new agreement                                 $ 20    
After-tax costs related to preparation for and ratification of new agreement                                 13    
Weighted average discount rate used to determine pension benefit obligation   4.15% 4.90%                         5.95%     6.15%
Increase in pension liability, plan amendment                               166      
Increase in net actuarial loss after-tax, plan amendment                               108      
Increase in net periodic benefit cost, plan amendment                               9      
Average duration refined yield curve model parallels the plans, years   10                                  
Percentage increase in rate of compensation                     3.50%                
Average period over which rate of compensation increases, years                     5                
Average period of historical returns used to calculate expected future returns, in years   5                   4              
Period of moving averages used for historical data points used to determine the expected long-term rate of return on plan assets, in years                         10 20          
Expected long term rate of return on plan assets   8.50% 8.50% 8.75% 8.75% 9.00% 8.50%                        
10-year moving average of actual performance                 9.00%                    
20-year moving average of actual performance                             9.00%        
Health care cost trend rate assumed for next year   6.00% 6.50% 6.50%                              
Health care cost trend rate   4.50% 5.00% 5.00%       3.80%   (6.20%)                  
Number of years over actual annual health care cost trend experience   3                                  
Collateral, which exceeds the value of the securities loaned               105.00%   102.00%                  
Cash contribution to pension plans   561 336 113                              
Value of common stock shares newly issued     600 600                              
Percentage of funded status of pension plans 80.00%                                    
Minimum required cash contribution to pension plan in 2012   460                   140              
Expenses related to saving and investment plans   $ 146 $ 139 $ 119