|**Segment, Geographic and Other Revenue Information - Revenues By Geographic Area (Detail) (USD $)In Millions, unless otherwise specified**                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   | 3 Months Ended                                                                                                                                                                                                                                                                                                                   | 9 Months Ended                                                                                                                                                                                                                                                                                                                  
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|**Revenues from External Customers and Long-Lived Assets [Line Items]**                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       |                                                                                                                                                                                                                                                                                                                                  |                                                                                                                                                                                                                                                                                                                                 
|Revenues                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      | $ 13,976                                                                                                                                                                                                                                                                                                                         |                                                                                                                                                                                                                                                                                                                                 
|Percentage Change in Revenue                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  | (16.00%)                                                                                                                                                                                                                                                                                                                         |                                                                                                                                                                                                                                                                                                                                 
|United States [Member]                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        |                                                                                                                                                                                                                                                                                                                                  |                                                                                                                                                                                                                                                                                                                                 
|**Revenues from External Customers and Long-Lived Assets [Line Items]**                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       |                                                                                                                                                                                                                                                                                                                                  |                                                                                                                                                                                                                                                                                                                                 
|Revenues                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      | 5,627                                                                                                                                                                                                                                                                                                                            |                                                                                                                                                                                                                                                                                                                                 
|Percentage Change in Revenue                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  | (18.00%)                                                                                                                                                                                                                                                                                                                         |                                                                                                                                                                                                                                                                                                                                 
|Developed Europe [Member]                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     |                                                                                                                                                                                                                                                                                                                                  |                                                                                                                                                                                                                                                                                                                                 
|**Revenues from External Customers and Long-Lived Assets [Line Items]**                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       |                                                                                                                                                                                                                                                                                                                                  |                                                                                                                                                                                                                                                                                                                                 
|Revenues                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      | 2,976                                                                                                                                                                                                                                                                                                                            | [1]                                                                                                                                                                                                                                                                                                                             
|Percentage Change in Revenue                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  | (26.00%)                                                                                                                                                                                                                                                                                                                         | [1]                                                                                                                                                                                                                                                                                                                             
|Developed Rest Of World [Member]                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              |                                                                                                                                                                                                                                                                                                                                  |                                                                                                                                                                                                                                                                                                                                 
|**Revenues from External Customers and Long-Lived Assets [Line Items]**                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       |                                                                                                                                                                                                                                                                                                                                  |                                                                                                                                                                                                                                                                                                                                 
|Revenues                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      | 2,529                                                                                                                                                                                                                                                                                                                            | [2]                                                                                                                                                                                                                                                                                                                             
|Percentage Change in Revenue                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  | (10.00%)                                                                                                                                                                                                                                                                                                                         | [2]                                                                                                                                                                                                                                                                                                                             
|Emerging Markets [Member]                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     |                                                                                                                                                                                                                                                                                                                                  |                                                                                                                                                                                                                                                                                                                                 
|**Revenues from External Customers and Long-Lived Assets [Line Items]**                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       |                                                                                                                                                                                                                                                                                                                                  |                                                                                                                                                                                                                                                                                                                                 
|Revenues                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      | $ 2,844                                                                                                                                                                                                                                                                                                                          | [3]                                                                                                                                                                                                                                                                                                                             
|Percentage Change in Revenue                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  | (2.00%)                                                                                                                                                                                                                                                                                                                          | [3]                                                                                                                                                                                                                                                                                                                             
|                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             
|[1]
              Developed Europe region includes the following markets: Western Europe, Finland and the Scandinavian countries. Revenues denominated in euros were $2.2 billion and $3.0 billion in the third quarter of 2012 and 2011, respectively, and $7.5 billion and $9.1 billion in the first nine months of 2012 and 2011, respectively.[2]
              Developed Rest of World region includes the following markets: Australia, Canada, Japan, New Zealand and South Korea.[3]
              Emerging Markets region includes, but is not limited to, the following markets: Asia (excluding Japan and South Korea), Latin America, Middle East, Africa, Central and Eastern Europe and Turkey. | [1]                                                                                                                                                                                                                                                                                                                              | Developed Europe region includes the following markets: Western Europe, Finland and the Scandinavian countries. Revenues denominated in euros were $2.2 billion and $3.0 billion in the third quarter of 2012 and 2011, respectively, and $7.5 billion and $9.1 billion in the first nine months of 2012 and 2011, respectively.
|[1]                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           | Developed Europe region includes the following markets: Western Europe, Finland and the Scandinavian countries. Revenues denominated in euros were $2.2 billion and $3.0 billion in the third quarter of 2012 and 2011, respectively, and $7.5 billion and $9.1 billion in the first nine months of 2012 and 2011, respectively.
|[2]                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           | Developed Rest of World region includes the following markets: Australia, Canada, Japan, New Zealand and South Korea.                                                                                                                                                                                                           
|[3]                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           | Emerging Markets region includes, but is not limited to, the following markets: Asia (excluding Japan and South Korea), Latin America, Middle East, Africa, Central and Eastern Europe and Turkey.                                                                                                                              

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