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Pension Plans Postretirement and Other Employee Benefits - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
0 Months Ended 12 Months Ended
Jan. 02, 2012
retirement_plan
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Pension and Other Postretirement Benefits Disclosure [Line Items]        
Pension benefit obligations   $ 863    
Pension benefit obligations with funding requirements   779    
Pension Fund assets available to fund pension benefit obligations   726    
Pension benefit obligations with no funding requirements   84    
Acceptable tolerance limit of investment allocations for securities   5.00%    
Employer contributions   57    
Expected contributions in 2013   47    
Minimum retirement age for eligible employees of the post retirement plans   55 years    
Minimum years of service for eligible employees of the post retirement plans   10 years    
Defined Benefit Plan, Ultimate Health Care Cost Trend Rate   7.00% 7.50% 8.00%
Defined Benefit Plan Ultimate Health Care Cost Year Five   4.50%    
Retirement Savings Plan 1      
Maximum percentage of salary deferral allowed under the Employee Stock Ownership Plans   75.00%    
Defined Compensation Plan, Amended Employee Match Percentage on One Hundred Percent of Employee Contributions   3.00%    
Defined Compensation Plan, Amended Employee Match Percentage on Fifty Percent of Employee Contributions   2.00%    
Expense recorded relating to employee matching contribution   23 21 18
Postretirement
       
Pension and Other Postretirement Benefits Disclosure [Line Items]        
Employer contributions   8 10  
One percentage point increase effect on postretirement benefit obligation   8    
One percentage point decrease effect on postretirement benefit obligation   7    
Postretirement | Maximum
       
Pension and Other Postretirement Benefits Disclosure [Line Items]        
Defined benefit plan effect of one percentage point increase on service and interest cost components   1    
Defined benefit plan effect of one percentage point decrease on service and interest cost components   1    
Pension Plans, Defined Benefit
       
Pension and Other Postretirement Benefits Disclosure [Line Items]        
Expected contributions in 2013   $ 8    
Equity Securities
       
Pension and Other Postretirement Benefits Disclosure [Line Items]        
Targeted pension plan allocations in debt securities   70.00%    
Debt Securities
       
Pension and Other Postretirement Benefits Disclosure [Line Items]        
Targeted pension plan allocations in debt securities   30.00%