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Financial Instruments - Investments in Debt Securities (Detail) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2011
Dec. 31, 2010
Schedule of Available for sale Securities and Held to maturity Securities [Line Items]    
Debt securities maturities within 1 year $ 23,370  
Debt securities maturities over 1 to 5 years 6,414  
Debt securities maturities over 5 to 10 years 550  
Total debt securities 30,334  
Held-to-maturity debt securities maturities total 1,155 [1] 1,178 [1]
Certificates of deposit and other [Member]
   
Schedule of Available for sale Securities and Held to maturity Securities [Line Items]    
Held-to-maturity debt securities maturities within 1 year 1,150  
Held-to-maturity debt securities with maturities over 1 to 5 years 5  
Held-to-maturity debt securities maturities total 1,155  
Western European, Scandinavian and other government debt [Member]
   
Schedule of Available for sale Securities and Held to maturity Securities [Line Items]    
Available-for- sale debt securities maturities within 1 year 9,895  
Available-for-sale debt securities maturities over 1 to 5 years 1,177  
Available-for-sale debt securities maturities total 11,072  
Corporate debt [Member]
   
Schedule of Available for sale Securities and Held to maturity Securities [Line Items]    
Available-for- sale debt securities maturities within 1 year 3,921 [2]  
Available-for-sale debt securities maturities over 1 to 5 years 2,321 [2]  
Available-for-sale debt securities maturities over 5 to 10 years 284 [2]  
Available-for-sale debt securities maturities total 6,526 [2]  
U.S. Government debt [Member]
   
Schedule of Available for sale Securities and Held to maturity Securities [Line Items]    
Available-for- sale debt securities maturities within 1 year 5,431  
Available-for-sale debt securities maturities over 5 to 10 years 257  
Available-for-sale debt securities maturities total 5,688  
Supranational debt [Member]
   
Schedule of Available for sale Securities and Held to maturity Securities [Line Items]    
Available-for- sale debt securities maturities within 1 year 1,872  
Available-for-sale debt securities maturities over 1 to 5 years 433  
Available-for-sale debt securities maturities total 2,305  
Federal Home Loan Mortgage Corporation and Federal National Mortgage Association asset-backed securities [Member]
   
Schedule of Available for sale Securities and Held to maturity Securities [Line Items]    
Available-for-sale debt securities maturities over 1 to 5 years 2,225  
Available-for-sale debt securities maturities over 5 to 10 years 9  
Available-for-sale debt securities maturities total 2,234  
Western European and other government agency debt [Member]
   
Schedule of Available for sale Securities and Held to maturity Securities [Line Items]    
Available-for- sale debt securities maturities within 1 year 1,101  
Available-for-sale debt securities maturities over 1 to 5 years 253  
Available-for-sale debt securities maturities total $ 1,354  
[1] Gross unrealized gains and losses are not significant.
[2] Primarily issued by above-investment-grade institutions in the financial services sector.