|**Financial Instruments by Balance Sheet Grouping (Parenthetical) (Detail) (USD $)In Millions, unless otherwise specified**                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                | Mar. 31, 2013                                                                                                                                                                                                                                                                                                                                          | Dec. 31, 2012                                                                                                                                                                                                                                                                                                                                         
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|**Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]**                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          |                                                                                                                                                                                                                                                                                                                                                        |                                                                                                                                                                                                                                                                                                                                                       
|Taxes and other current assets                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             | $ 367                                                                                                                                                                                                                                                                                                                                                  | [1]                                                                                                                                                                                                                                                                                                                                                   
|Taxes and other noncurrent assets                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          | 961                                                                                                                                                                                                                                                                                                                                                    | [2]                                                                                                                                                                                                                                                                                                                                                   
|Other current liabilities                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  | 247                                                                                                                                                                                                                                                                                                                                                    | [3]                                                                                                                                                                                                                                                                                                                                                   
|Other noncurrent liabilities                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               | 701                                                                                                                                                                                                                                                                                                                                                    | [4]                                                                                                                                                                                                                                                                                                                                                   
|Foreign currency forward-exchange contracts [Member]                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       |                                                                                                                                                                                                                                                                                                                                                        |                                                                                                                                                                                                                                                                                                                                                       
|**Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]**                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          |                                                                                                                                                                                                                                                                                                                                                        |                                                                                                                                                                                                                                                                                                                                                       
|Taxes and other current assets                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             | 249                                                                                                                                                                                                                                                                                                                                                    |                                                                                                                                                                                                                                                                                                                                                       
|Other current liabilities                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  | 99                                                                                                                                                                                                                                                                                                                                                     |                                                                                                                                                                                                                                                                                                                                                       
|Foreign Exchange Contract [Member]                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         |                                                                                                                                                                                                                                                                                                                                                        |                                                                                                                                                                                                                                                                                                                                                       
|**Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]**                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          |                                                                                                                                                                                                                                                                                                                                                        |                                                                                                                                                                                                                                                                                                                                                       
|Taxes and other current assets                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             | 54                                                                                                                                                                                                                                                                                                                                                     |                                                                                                                                                                                                                                                                                                                                                       
|Taxes and other noncurrent assets                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          | 234                                                                                                                                                                                                                                                                                                                                                    |                                                                                                                                                                                                                                                                                                                                                       
|Other current liabilities                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  | 148                                                                                                                                                                                                                                                                                                                                                    |                                                                                                                                                                                                                                                                                                                                                       
|Other noncurrent liabilities                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               | 675                                                                                                                                                                                                                                                                                                                                                    |                                                                                                                                                                                                                                                                                                                                                       
|Interest rate swaps [Member]                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               |                                                                                                                                                                                                                                                                                                                                                        |                                                                                                                                                                                                                                                                                                                                                       
|**Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]**                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          |                                                                                                                                                                                                                                                                                                                                                        |                                                                                                                                                                                                                                                                                                                                                       
|Taxes and other current assets                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             | 64                                                                                                                                                                                                                                                                                                                                                     |                                                                                                                                                                                                                                                                                                                                                       
|Taxes and other noncurrent assets                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          | 727                                                                                                                                                                                                                                                                                                                                                    |                                                                                                                                                                                                                                                                                                                                                       
|Other noncurrent liabilities                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               | $ 26                                                                                                                                                                                                                                                                                                                                                   |                                                                                                                                                                                                                                                                                                                                                       
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|[1]
              As of March 31, 2013, derivative instruments at fair value include foreign currency forward-exchange contracts ($249 million), interest rate swaps ($64 million), and foreign currency swaps ($54 million) and, as of December 31, 2012, include foreign currency forward-exchange contracts ($152 million) and foreign currency swaps ($144 million).[2]
              As of March 31, 2013, derivative instruments at fair value include interest rate swaps ($727 million) and foreign currency swaps ($234 million) and, as of December 31, 2012, include interest rate swaps ($1 billion) and foreign currency swaps ($50 million).[3]
              At March 31, 2013, derivative instruments at fair value include foreign currency swaps ($148 million) and foreign currency forward-exchange contracts ($99 million) and, as of December 31, 2012, include foreign currency forward-exchange contracts ($243 million) and foreign currency swaps ($87 million).[4]
              At March 31, 2013, derivative instruments at fair value include foreign currency swaps ($675 million) and interest rate swaps ($26 million) and, as of December 31, 2012, include foreign currency swaps ($341 million) and interest rate swaps ($33 million). | [1]                                                                                                                                                                                                                                                                                                                                                    | As of March 31, 2013, derivative instruments at fair value include foreign currency forward-exchange contracts ($249 million), interest rate swaps ($64 million), and foreign currency swaps ($54 million) and, as of December 31, 2012, include foreign currency forward-exchange contracts ($152 million) and foreign currency swaps ($144 million).
|[1]                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        | As of March 31, 2013, derivative instruments at fair value include foreign currency forward-exchange contracts ($249 million), interest rate swaps ($64 million), and foreign currency swaps ($54 million) and, as of December 31, 2012, include foreign currency forward-exchange contracts ($152 million) and foreign currency swaps ($144 million).
|[2]                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        | As of March 31, 2013, derivative instruments at fair value include interest rate swaps ($727 million) and foreign currency swaps ($234 million) and, as of December 31, 2012, include interest rate swaps ($1 billion) and foreign currency swaps ($50 million).                                                                                      
|[3]                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        | At March 31, 2013, derivative instruments at fair value include foreign currency swaps ($148 million) and foreign currency forward-exchange contracts ($99 million) and, as of December 31, 2012, include foreign currency forward-exchange contracts ($243 million) and foreign currency swaps ($87 million).                                        
|[4]                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        | At March 31, 2013, derivative instruments at fair value include foreign currency swaps ($675 million) and interest rate swaps ($26 million) and, as of December 31, 2012, include foreign currency swaps ($341 million) and interest rate swaps ($33 million).                                                                                        

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