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Debt - Additional Information (Detail) (USD $)
 1 Months Ended 12 Months Ended
Sep. 28, 2012
Dec. 31, 2012
Dec. 31, 2011
Debt Instrument [Line Items]      
Funds available under revolving credit facility $ 3,500,000,000 $ 2,562,000,000  
Variable rate 0.875%    
Interest rate under multi currency facility LIBOR, NIBOR or EURIBOR plus 0.875    
Variable rate basis LIBOR, NIBOR or EURIBOR plus    
Outstanding letters of credit issued   0  
Outstanding letters of credit issued   938,000,000  
Outstanding letters of credit under various bilateral committed letter of credit facilities   2,254,000,000  
Net proceeds   2,969,000,000  
Underwriting fees   22,000,000  
Discount   9,000,000  
Fair Value of Unsecured Senior Note   3,190,000,000 526,000,000
Carrying Value of Unsecured Senior Note   3,149,000,000 510,000,000
Senior Notes, interest at 5.65% payable semiannually, principal due on November 15, 2012 [Member]
      
Debt Instrument [Line Items]      
Repayment of unsecured Senior Notes   200,000,000  
Percentage of unsecured Senior Notes   5.65%  
Senior Notes     200,000,000
Senior Notes, interest at 5.5% payable semiannually, principal due on November 19, 2012 [Member]
      
Debt Instrument [Line Items]      
Repayment of unsecured Senior Notes   150,000,000  
Percentage of unsecured Senior Notes   5.50%  
Senior Notes     150,000,000
Senior Notes, interest at 1.35% payable semiannually, principal due on December 1, 2017 [Member]
      
Debt Instrument [Line Items]      
Percentage of unsecured Senior Notes   1.35%  
Senior Notes   500,000,000  
Unsecured Senior Notes Due Date   2017  
Interest payable   Half Yearly  
Senior Notes, interest at 2.6% payable semiannually, principal due on December 1, 2022 [Member]
      
Debt Instrument [Line Items]      
Percentage of unsecured Senior Notes   2.60%  
Senior Notes   1,395,000,000  
Unsecured Senior Notes Due Date   2022  
Interest payable   Half Yearly  
Senior Notes, interest at 3.95% payable semiannually, principal due on December 1, 2042 [Member]
      
Debt Instrument [Line Items]      
Percentage of unsecured Senior Notes   3.95%  
Senior Notes   1,096,000,000  
Unsecured Senior Notes Due Date   2042  
Interest payable   Half Yearly  
Five-year revolving credit facility [Member]
      
Debt Instrument [Line Items]      
Unsecured revolving credit facility 2,000,000,000    
Multicurrency Borrowings [Member]
      
Debt Instrument [Line Items]      
Funds available under revolving credit facility 3,500,000,000    
Funds available under revolving credit facility $ 1,000,000,000