|
Fair value measurement (Details) (USD $)
In Millions, unless otherwise specified |
Sep. 30, 2012
|
Dec. 31, 2011
|
|---|---|---|
| Assets: | ||
| Total available-for-sale investments | $ 24,935 | $ 20,003 |
|
Fair Value, Measurements, Recurring [Member]
|
||
| Derivative Assets: | ||
| Interest rate swap contracts | 377 | |
| Total assets | 25,034 | 20,552 |
| Derivative Liabilities: | ||
| Contingent consideration obligations in connection with a business combination | 195 | 190 |
| Total liabilities | 277 | 264 |
|
Fair Value, Measurements, Recurring [Member] | Foreign currency contracts [Member]
|
||
| Derivative Assets: | ||
| Foreign currency contracts | 87 | 172 |
| Derivative Liabilities: | ||
| Foreign currency contracts | 55 | 48 |
|
Fair Value, Measurements, Recurring [Member] | Cross currency swap contracts [Member]
|
||
| Derivative Assets: | ||
| Foreign currency contracts | 12 | |
| Derivative Liabilities: | ||
| Foreign currency contracts | 27 | 26 |
|
Fair Value, Measurements, Recurring [Member] | U.S. Treasury securities [Member]
|
||
| Assets: | ||
| Total available-for-sale investments | 3,960 | 3,946 |
|
Fair Value, Measurements, Recurring [Member] | Other government-related debt securities - Obligations of U.S. government agencies and FDIC-guaranteed bank debt [Member]
|
||
| Assets: | ||
| Total available-for-sale investments | 1,198 | 1,571 |
|
Fair Value, Measurements, Recurring [Member] | Other government-related debt securities - Foreign and other [Member]
|
||
| Assets: | ||
| Total available-for-sale investments | 1,712 | 450 |
|
Fair Value, Measurements, Recurring [Member] | Corporate debt securities - Financial [Member]
|
||
| Assets: | ||
| Total available-for-sale investments | 3,256 | 2,508 |
|
Fair Value, Measurements, Recurring [Member] | Corporate debt securities - Industrial [Member]
|
||
| Assets: | ||
| Total available-for-sale investments | 4,318 | 3,146 |
|
Fair Value, Measurements, Recurring [Member] | Corporate debt securities - Other [Member]
|
||
| Assets: | ||
| Total available-for-sale investments | 432 | 289 |
|
Fair Value, Measurements, Recurring [Member] | Residential mortgage-backed securities [Member]
|
||
| Assets: | ||
| Total available-for-sale investments | 1,836 | 518 |
|
Fair Value, Measurements, Recurring [Member] | Other mortgage- and asset-backed securities [Member]
|
||
| Assets: | ||
| Total available-for-sale investments | 2,066 | 1,267 |
|
Fair Value, Measurements, Recurring [Member] | Money market mutual funds [Member]
|
||
| Assets: | ||
| Total available-for-sale investments | 4,000 | 6,266 |
|
Fair Value, Measurements, Recurring [Member] | Other short-term interest bearing securities [Member]
|
||
| Assets: | ||
| Total available-for-sale investments | 2,105 | |
|
Fair Value, Measurements, Recurring [Member] | Equity securities [Member]
|
||
| Assets: | ||
| Total available-for-sale investments | 52 | 42 |
|
Fair Value, Measurements, Recurring [Member] | Quoted prices in active markets for identical assets (Level 1) [Member]
|
||
| Derivative Assets: | ||
| Interest rate swap contracts | 0 | |
| Total assets | 8,012 | 10,254 |
| Derivative Liabilities: | ||
| Contingent consideration obligations in connection with a business combination | 0 | 0 |
| Total liabilities | 0 | 0 |
|
Fair Value, Measurements, Recurring [Member] | Quoted prices in active markets for identical assets (Level 1) [Member] | Foreign currency contracts [Member]
|
||
| Derivative Assets: | ||
| Foreign currency contracts | 0 | 0 |
| Derivative Liabilities: | ||
| Foreign currency contracts | 0 | 0 |
|
Fair Value, Measurements, Recurring [Member] | Quoted prices in active markets for identical assets (Level 1) [Member] | Cross currency swap contracts [Member]
|
||
| Derivative Assets: | ||
| Foreign currency contracts | 0 | |
| Derivative Liabilities: | ||
| Foreign currency contracts | 0 | 0 |
|
Fair Value, Measurements, Recurring [Member] | Quoted prices in active markets for identical assets (Level 1) [Member] | U.S. Treasury securities [Member]
|
||
| Assets: | ||
| Total available-for-sale investments | 3,960 | 3,946 |
|
Fair Value, Measurements, Recurring [Member] | Quoted prices in active markets for identical assets (Level 1) [Member] | Other government-related debt securities - Obligations of U.S. government agencies and FDIC-guaranteed bank debt [Member]
|
||
| Assets: | ||
| Total available-for-sale investments | 0 | 0 |
|
Fair Value, Measurements, Recurring [Member] | Quoted prices in active markets for identical assets (Level 1) [Member] | Other government-related debt securities - Foreign and other [Member]
|
||
| Assets: | ||
| Total available-for-sale investments | 0 | 0 |
|
Fair Value, Measurements, Recurring [Member] | Quoted prices in active markets for identical assets (Level 1) [Member] | Corporate debt securities - Financial [Member]
|
||
| Assets: | ||
| Total available-for-sale investments | 0 | 0 |
|
Fair Value, Measurements, Recurring [Member] | Quoted prices in active markets for identical assets (Level 1) [Member] | Corporate debt securities - Industrial [Member]
|
||
| Assets: | ||
| Total available-for-sale investments | 0 | 0 |
|
Fair Value, Measurements, Recurring [Member] | Quoted prices in active markets for identical assets (Level 1) [Member] | Corporate debt securities - Other [Member]
|
||
| Assets: | ||
| Total available-for-sale investments | 0 | 0 |
|
Fair Value, Measurements, Recurring [Member] | Quoted prices in active markets for identical assets (Level 1) [Member] | Residential mortgage-backed securities [Member]
|
||
| Assets: | ||
| Total available-for-sale investments | 0 | 0 |
|
Fair Value, Measurements, Recurring [Member] | Quoted prices in active markets for identical assets (Level 1) [Member] | Other mortgage- and asset-backed securities [Member]
|
||
| Assets: | ||
| Total available-for-sale investments | 0 | 0 |
|
Fair Value, Measurements, Recurring [Member] | Quoted prices in active markets for identical assets (Level 1) [Member] | Money market mutual funds [Member]
|
||
| Assets: | ||
| Total available-for-sale investments | 4,000 | 6,266 |
|
Fair Value, Measurements, Recurring [Member] | Quoted prices in active markets for identical assets (Level 1) [Member] | Other short-term interest bearing securities [Member]
|
||
| Assets: | ||
| Total available-for-sale investments | 0 | |
|
Fair Value, Measurements, Recurring [Member] | Quoted prices in active markets for identical assets (Level 1) [Member] | Equity securities [Member]
|
||
| Assets: | ||
| Total available-for-sale investments | 52 | 42 |
|
Fair Value, Measurements, Recurring [Member] | Significant other observable inputs (Level 2) [Member]
|
||
| Derivative Assets: | ||
| Interest rate swap contracts | 377 | |
| Total assets | 17,022 | 10,298 |
| Derivative Liabilities: | ||
| Contingent consideration obligations in connection with a business combination | 0 | 0 |
| Total liabilities | 82 | 74 |
|
Fair Value, Measurements, Recurring [Member] | Significant other observable inputs (Level 2) [Member] | Foreign currency contracts [Member]
|
||
| Derivative Assets: | ||
| Foreign currency contracts | 87 | 172 |
| Derivative Liabilities: | ||
| Foreign currency contracts | 55 | 48 |
|
Fair Value, Measurements, Recurring [Member] | Significant other observable inputs (Level 2) [Member] | Cross currency swap contracts [Member]
|
||
| Derivative Assets: | ||
| Foreign currency contracts | 12 | |
| Derivative Liabilities: | ||
| Foreign currency contracts | 27 | 26 |
|
Fair Value, Measurements, Recurring [Member] | Significant other observable inputs (Level 2) [Member] | U.S. Treasury securities [Member]
|
||
| Assets: | ||
| Total available-for-sale investments | 0 | 0 |
|
Fair Value, Measurements, Recurring [Member] | Significant other observable inputs (Level 2) [Member] | Other government-related debt securities - Obligations of U.S. government agencies and FDIC-guaranteed bank debt [Member]
|
||
| Assets: | ||
| Total available-for-sale investments | 1,198 | 1,571 |
|
Fair Value, Measurements, Recurring [Member] | Significant other observable inputs (Level 2) [Member] | Other government-related debt securities - Foreign and other [Member]
|
||
| Assets: | ||
| Total available-for-sale investments | 1,712 | 450 |
|
Fair Value, Measurements, Recurring [Member] | Significant other observable inputs (Level 2) [Member] | Corporate debt securities - Financial [Member]
|
||
| Assets: | ||
| Total available-for-sale investments | 3,256 | 2,508 |
|
Fair Value, Measurements, Recurring [Member] | Significant other observable inputs (Level 2) [Member] | Corporate debt securities - Industrial [Member]
|
||
| Assets: | ||
| Total available-for-sale investments | 4,318 | 3,146 |
|
Fair Value, Measurements, Recurring [Member] | Significant other observable inputs (Level 2) [Member] | Corporate debt securities - Other [Member]
|
||
| Assets: | ||
| Total available-for-sale investments | 432 | 289 |
|
Fair Value, Measurements, Recurring [Member] | Significant other observable inputs (Level 2) [Member] | Residential mortgage-backed securities [Member]
|
||
| Assets: | ||
| Total available-for-sale investments | 1,836 | 518 |
|
Fair Value, Measurements, Recurring [Member] | Significant other observable inputs (Level 2) [Member] | Other mortgage- and asset-backed securities [Member]
|
||
| Assets: | ||
| Total available-for-sale investments | 2,066 | 1,267 |
|
Fair Value, Measurements, Recurring [Member] | Significant other observable inputs (Level 2) [Member] | Money market mutual funds [Member]
|
||
| Assets: | ||
| Total available-for-sale investments | 0 | 0 |
|
Fair Value, Measurements, Recurring [Member] | Significant other observable inputs (Level 2) [Member] | Other short-term interest bearing securities [Member]
|
||
| Assets: | ||
| Total available-for-sale investments | 2,105 | |
|
Fair Value, Measurements, Recurring [Member] | Significant other observable inputs (Level 2) [Member] | Equity securities [Member]
|
||
| Assets: | ||
| Total available-for-sale investments | 0 | 0 |
|
Fair Value, Measurements, Recurring [Member] | Significant unobservable inputs (Level 3) [Member]
|
||
| Derivative Assets: | ||
| Interest rate swap contracts | 0 | |
| Total assets | 0 | 0 |
| Derivative Liabilities: | ||
| Contingent consideration obligations in connection with a business combination | 195 | 190 |
| Total liabilities | 195 | 190 |
|
Fair Value, Measurements, Recurring [Member] | Significant unobservable inputs (Level 3) [Member] | Foreign currency contracts [Member]
|
||
| Derivative Assets: | ||
| Foreign currency contracts | 0 | 0 |
| Derivative Liabilities: | ||
| Foreign currency contracts | 0 | 0 |
|
Fair Value, Measurements, Recurring [Member] | Significant unobservable inputs (Level 3) [Member] | Cross currency swap contracts [Member]
|
||
| Derivative Assets: | ||
| Foreign currency contracts | 0 | |
| Derivative Liabilities: | ||
| Foreign currency contracts | 0 | 0 |
|
Fair Value, Measurements, Recurring [Member] | Significant unobservable inputs (Level 3) [Member] | U.S. Treasury securities [Member]
|
||
| Assets: | ||
| Total available-for-sale investments | 0 | 0 |
|
Fair Value, Measurements, Recurring [Member] | Significant unobservable inputs (Level 3) [Member] | Other government-related debt securities - Obligations of U.S. government agencies and FDIC-guaranteed bank debt [Member]
|
||
| Assets: | ||
| Total available-for-sale investments | 0 | 0 |
|
Fair Value, Measurements, Recurring [Member] | Significant unobservable inputs (Level 3) [Member] | Other government-related debt securities - Foreign and other [Member]
|
||
| Assets: | ||
| Total available-for-sale investments | 0 | 0 |
|
Fair Value, Measurements, Recurring [Member] | Significant unobservable inputs (Level 3) [Member] | Corporate debt securities - Financial [Member]
|
||
| Assets: | ||
| Total available-for-sale investments | 0 | 0 |
|
Fair Value, Measurements, Recurring [Member] | Significant unobservable inputs (Level 3) [Member] | Corporate debt securities - Industrial [Member]
|
||
| Assets: | ||
| Total available-for-sale investments | 0 | 0 |
|
Fair Value, Measurements, Recurring [Member] | Significant unobservable inputs (Level 3) [Member] | Corporate debt securities - Other [Member]
|
||
| Assets: | ||
| Total available-for-sale investments | 0 | 0 |
|
Fair Value, Measurements, Recurring [Member] | Significant unobservable inputs (Level 3) [Member] | Residential mortgage-backed securities [Member]
|
||
| Assets: | ||
| Total available-for-sale investments | 0 | 0 |
|
Fair Value, Measurements, Recurring [Member] | Significant unobservable inputs (Level 3) [Member] | Other mortgage- and asset-backed securities [Member]
|
||
| Assets: | ||
| Total available-for-sale investments | 0 | 0 |
|
Fair Value, Measurements, Recurring [Member] | Significant unobservable inputs (Level 3) [Member] | Money market mutual funds [Member]
|
||
| Assets: | ||
| Total available-for-sale investments | 0 | 0 |
|
Fair Value, Measurements, Recurring [Member] | Significant unobservable inputs (Level 3) [Member] | Other short-term interest bearing securities [Member]
|
||
| Assets: | ||
| Total available-for-sale investments | 0 | |
|
Fair Value, Measurements, Recurring [Member] | Significant unobservable inputs (Level 3) [Member] | Equity securities [Member]
|
||
| Assets: | ||
| Total available-for-sale investments | $ 0 | $ 0 |