|**Financial Instruments by Balance Sheet Grouping (Parenthetical) (Detail) (USD $)In Millions, unless otherwise specified**                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           | Sep. 30, 2012                                                                                                                                                                                                                                                                                                                                        | Dec. 31, 2011                                                                                                                                                                                                                                                                                                                                       
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|**Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]**                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     |                                                                                                                                                                                                                                                                                                                                                      |                                                                                                                                                                                                                                                                                                                                                     
|Taxes and other current assets                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        | $ 210                                                                                                                                                                                                                                                                                                                                                | [1]                                                                                                                                                                                                                                                                                                                                                 
|Taxes and other noncurrent assets                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     | 1,073                                                                                                                                                                                                                                                                                                                                                | [2]                                                                                                                                                                                                                                                                                                                                                 
|Other current liabilities                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             | 395                                                                                                                                                                                                                                                                                                                                                  | [3]                                                                                                                                                                                                                                                                                                                                                 
|Other noncurrent liabilities                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          | 971                                                                                                                                                                                                                                                                                                                                                  | [4]                                                                                                                                                                                                                                                                                                                                                 
|Foreign currency forward-exchange contracts [Member]                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  |                                                                                                                                                                                                                                                                                                                                                      |                                                                                                                                                                                                                                                                                                                                                     
|**Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]**                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     |                                                                                                                                                                                                                                                                                                                                                      |                                                                                                                                                                                                                                                                                                                                                     
|Taxes and other current assets                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        | 178                                                                                                                                                                                                                                                                                                                                                  |                                                                                                                                                                                                                                                                                                                                                     
|Other current liabilities                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             | 165                                                                                                                                                                                                                                                                                                                                                  |                                                                                                                                                                                                                                                                                                                                                     
|Foreign Exchange Contract [Member]                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    |                                                                                                                                                                                                                                                                                                                                                      |                                                                                                                                                                                                                                                                                                                                                     
|**Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]**                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     |                                                                                                                                                                                                                                                                                                                                                      |                                                                                                                                                                                                                                                                                                                                                     
|Taxes and other current assets                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        | 20                                                                                                                                                                                                                                                                                                                                                   |                                                                                                                                                                                                                                                                                                                                                     
|Taxes and other noncurrent assets                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     | 56                                                                                                                                                                                                                                                                                                                                                   |                                                                                                                                                                                                                                                                                                                                                     
|Other current liabilities                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             | 230                                                                                                                                                                                                                                                                                                                                                  |                                                                                                                                                                                                                                                                                                                                                     
|Other noncurrent liabilities                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          | 942                                                                                                                                                                                                                                                                                                                                                  |                                                                                                                                                                                                                                                                                                                                                     
|Interest rate swaps [Member]                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          |                                                                                                                                                                                                                                                                                                                                                      |                                                                                                                                                                                                                                                                                                                                                     
|**Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]**                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     |                                                                                                                                                                                                                                                                                                                                                      |                                                                                                                                                                                                                                                                                                                                                     
|Taxes and other current assets                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        | 12                                                                                                                                                                                                                                                                                                                                                   |                                                                                                                                                                                                                                                                                                                                                     
|Taxes and other noncurrent assets                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     | 1,000                                                                                                                                                                                                                                                                                                                                                |                                                                                                                                                                                                                                                                                                                                                     
|Other noncurrent liabilities                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          | $ 29                                                                                                                                                                                                                                                                                                                                                 |                                                                                                                                                                                                                                                                                                                                                     
|                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     
|[1]
              As of September 30, 2012, derivative instruments at fair value include foreign currency forward-exchange contracts ($178 million), foreign currency swaps ($20 million) and interest rate swaps ($12 million) and, as of December 31, 2011, include foreign currency forward-exchange contracts ($349 million) and interest rate swaps ($8 million).[2]
              As of September 30, 2012, derivative instruments at fair value include interest rate swaps ($1.0 billion) and foreign currency swaps ($56 million) and, as of December 31, 2011, include interest rate swaps ($1 billion) and foreign currency swaps ($17 million).[3]
              At September 30, 2012, derivative instruments at fair value include foreign currency swaps ($230 million) and foreign currency forward-exchange contracts ($165 million) and, as of December 31, 2011, include foreign currency forward-exchange contracts ($355 million) and foreign currency swaps ($104 million).[4]
              At September 30, 2012, derivative instruments at fair value include foreign currency swaps ($942 million) and interest rate swaps ($29 million) and, as of December 31, 2011, include foreign currency swaps ($1.3 billion) and interest rate swaps ($14 million). | [1]                                                                                                                                                                                                                                                                                                                                                  | As of September 30, 2012, derivative instruments at fair value include foreign currency forward-exchange contracts ($178 million), foreign currency swaps ($20 million) and interest rate swaps ($12 million) and, as of December 31, 2011, include foreign currency forward-exchange contracts ($349 million) and interest rate swaps ($8 million).
|[1]                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   | As of September 30, 2012, derivative instruments at fair value include foreign currency forward-exchange contracts ($178 million), foreign currency swaps ($20 million) and interest rate swaps ($12 million) and, as of December 31, 2011, include foreign currency forward-exchange contracts ($349 million) and interest rate swaps ($8 million).
|[2]                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   | As of September 30, 2012, derivative instruments at fair value include interest rate swaps ($1.0 billion) and foreign currency swaps ($56 million) and, as of December 31, 2011, include interest rate swaps ($1 billion) and foreign currency swaps ($17 million).                                                                                 
|[3]                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   | At September 30, 2012, derivative instruments at fair value include foreign currency swaps ($230 million) and foreign currency forward-exchange contracts ($165 million) and, as of December 31, 2011, include foreign currency forward-exchange contracts ($355 million) and foreign currency swaps ($104 million).                                
|[4]                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   | At September 30, 2012, derivative instruments at fair value include foreign currency swaps ($942 million) and interest rate swaps ($29 million) and, as of December 31, 2011, include foreign currency swaps ($1.3 billion) and interest rate swaps ($14 million).                                                                                  

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