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Fair value measurement (Details) - USD ($)
$ in Millions
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2014
Assets:            
Total available-for-sale investments $ 34,690   $ 31,112      
Fair Value, Measurements, Recurring [Member]            
Derivatives:            
Total assets 35,041   31,325      
Derivatives:            
Contingent consideration obligations in connection with business combinations 171   188      
Total liabilities 658   449      
Fair Value, Measurements, Recurring [Member] | Foreign currency contracts [Member]            
Derivatives:            
Foreign currency and cross-currency swap contracts 68   142      
Derivatives:            
Foreign currency and cross-currency swap contracts 27   8      
Fair Value, Measurements, Recurring [Member] | Cross currency swap contracts [Member]            
Derivatives:            
Foreign currency and cross-currency swap contracts 17          
Derivatives:            
Foreign currency and cross-currency swap contracts 456   250      
Fair Value, Measurements, Recurring [Member] | Interest rate swap contracts [Member]            
Derivatives:            
Interest rate contracts 266   71      
Derivatives:            
Interest rate swap contracts     3      
Fair Value, Measurements, Recurring [Member] | Forward interest rate contracts [Member]            
Derivatives:            
Interest rate swap contracts 4          
Fair Value, Measurements, Recurring [Member] | U.S. Treasury securities [Member]            
Assets:            
Total available-for-sale investments 8,020   4,274      
Fair Value, Measurements, Recurring [Member] | Other government-related debt securities - U.S. [Member]            
Assets:            
Total available-for-sale investments 347   534      
Fair Value, Measurements, Recurring [Member] | Other government-related debt securities - Foreign and other [Member]            
Assets:            
Total available-for-sale investments 1,866   1,739      
Fair Value, Measurements, Recurring [Member] | Corporate debt securities - Financial [Member]            
Assets:            
Total available-for-sale investments 8,238   7,871      
Fair Value, Measurements, Recurring [Member] | Corporate debt securities - Industrial [Member]            
Assets:            
Total available-for-sale investments 8,473   7,836      
Fair Value, Measurements, Recurring [Member] | Corporate debt securities - Other [Member]            
Assets:            
Total available-for-sale investments 1,018   885      
Fair Value, Measurements, Recurring [Member] | Residential mortgage-backed securities [Member]            
Assets:            
Total available-for-sale investments 1,738   1,470      
Fair Value, Measurements, Recurring [Member] | Other mortgage- and asset-backed securities [Member]            
Assets:            
Total available-for-sale investments 2,180   2,469      
Fair Value, Measurements, Recurring [Member] | Money market mutual funds [Member]            
Assets:            
Total available-for-sale investments 1,673   3,370      
Fair Value, Measurements, Recurring [Member] | Other short-term interest-bearing securities [Member]            
Assets:            
Total available-for-sale investments 1,014   528      
Fair Value, Measurements, Recurring [Member] | Equity securities [Member]            
Assets:            
Total available-for-sale investments 123   136      
Fair Value, Measurements, Recurring [Member] | Quoted prices in active markets for identical assets (Level 1) [Member]            
Derivatives:            
Total assets 9,816   7,780      
Derivatives:            
Contingent consideration obligations in connection with business combinations 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]            
Derivatives:            
Foreign currency and cross-currency swap contracts 0   0      
Derivatives:            
Foreign currency and cross-currency swap contracts 0   0      
Fair Value, Measurements, Recurring [Member] | Quoted prices in active markets for identical assets (Level 1) [Member] | Cross currency swap contracts [Member]            
Derivatives:            
Foreign currency and cross-currency swap contracts 0          
Derivatives:            
Foreign currency and cross-currency swap contracts 0   0      
Fair Value, Measurements, Recurring [Member] | Quoted prices in active markets for identical assets (Level 1) [Member] | Interest rate swap contracts [Member]            
Derivatives:            
Interest rate contracts 0   0      
Derivatives:            
Interest rate swap contracts     0      
Fair Value, Measurements, Recurring [Member] | Quoted prices in active markets for identical assets (Level 1) [Member] | Forward interest rate contracts [Member]            
Derivatives:            
Interest rate swap contracts 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 8,020   4,274      
Fair Value, Measurements, Recurring [Member] | Quoted prices in active markets for identical assets (Level 1) [Member] | Other government-related debt securities - U.S. [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 1,673   3,370      
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   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 123   136      
Fair Value, Measurements, Recurring [Member] | Significant other observable inputs (Level 2) [Member]            
Derivatives:            
Total assets 25,225   23,545      
Derivatives:            
Contingent consideration obligations in connection with business combinations 0   0      
Total liabilities 487   261      
Fair Value, Measurements, Recurring [Member] | Significant other observable inputs (Level 2) [Member] | Foreign currency contracts [Member]            
Derivatives:            
Foreign currency and cross-currency swap contracts 68   142      
Derivatives:            
Foreign currency and cross-currency swap contracts 27   8      
Fair Value, Measurements, Recurring [Member] | Significant other observable inputs (Level 2) [Member] | Cross currency swap contracts [Member]            
Derivatives:            
Foreign currency and cross-currency swap contracts 17          
Derivatives:            
Foreign currency and cross-currency swap contracts 456   250      
Fair Value, Measurements, Recurring [Member] | Significant other observable inputs (Level 2) [Member] | Interest rate swap contracts [Member]            
Derivatives:            
Interest rate contracts 266   71      
Derivatives:            
Interest rate swap contracts     3      
Fair Value, Measurements, Recurring [Member] | Significant other observable inputs (Level 2) [Member] | Forward interest rate contracts [Member]            
Derivatives:            
Interest rate swap contracts 4          
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 - U.S. [Member]            
Assets:            
Total available-for-sale investments 347   534      
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 1,866   1,739      
Fair Value, Measurements, Recurring [Member] | Significant other observable inputs (Level 2) [Member] | Corporate debt securities - Financial [Member]            
Assets:            
Total available-for-sale investments 8,238   7,871      
Fair Value, Measurements, Recurring [Member] | Significant other observable inputs (Level 2) [Member] | Corporate debt securities - Industrial [Member]            
Assets:            
Total available-for-sale investments 8,473   7,836      
Fair Value, Measurements, Recurring [Member] | Significant other observable inputs (Level 2) [Member] | Corporate debt securities - Other [Member]            
Assets:            
Total available-for-sale investments 1,018   885      
Fair Value, Measurements, Recurring [Member] | Significant other observable inputs (Level 2) [Member] | Residential mortgage-backed securities [Member]            
Assets:            
Total available-for-sale investments 1,738   1,470      
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 2,180   2,469      
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 1,014   528      
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]            
Derivatives:            
Total assets 0   0      
Derivatives:            
Contingent consideration obligations in connection with business combinations 171 $ 194 188 $ 215 $ 215 $ 215
Total liabilities 171   188      
Fair Value, Measurements, Recurring [Member] | Significant unobservable inputs (Level 3) [Member] | Foreign currency contracts [Member]            
Derivatives:            
Foreign currency and cross-currency swap contracts 0   0      
Derivatives:            
Foreign currency and cross-currency swap contracts 0   0      
Fair Value, Measurements, Recurring [Member] | Significant unobservable inputs (Level 3) [Member] | Cross currency swap contracts [Member]            
Derivatives:            
Foreign currency and cross-currency swap contracts 0          
Derivatives:            
Foreign currency and cross-currency swap contracts 0   0      
Fair Value, Measurements, Recurring [Member] | Significant unobservable inputs (Level 3) [Member] | Interest rate swap contracts [Member]            
Derivatives:            
Interest rate contracts 0   0      
Derivatives:            
Interest rate swap contracts     0      
Fair Value, Measurements, Recurring [Member] | Significant unobservable inputs (Level 3) [Member] | Forward interest rate contracts [Member]            
Derivatives:            
Interest rate swap contracts 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 - U.S. [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   0      
Fair Value, Measurements, Recurring [Member] | Significant unobservable inputs (Level 3) [Member] | Equity securities [Member]            
Assets:            
Total available-for-sale investments $ 0   $ 0