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Fair value measurement (Details) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2013
Dec. 31, 2012
Assets:    
Total available-for-sale investments $ 20,900 $ 23,745
Fair Value, Measurements, Recurring [Member]
    
Derivative Assets:    
Interest rate swap contracts 22  
Total assets 21,038 23,856
Derivative Liabilities:    
Contingent consideration obligations in connection with a business combination 222 221
Total liabilities 315 286
Fair Value, Measurements, Recurring [Member] | Foreign currency contracts [Member]
    
Derivative Assets:    
Foreign currency contracts 108 46
Derivative Liabilities:    
Foreign currency contracts 21 59
Fair Value, Measurements, Recurring [Member] | Cross currency swap contracts [Member]
    
Derivative Assets:    
Foreign currency contracts 8 65
Derivative Liabilities:    
Foreign currency contracts 72 6
Fair Value, Measurements, Recurring [Member] | U.S. Treasury securities [Member]
    
Assets:    
Total available-for-sale investments 2,707 4,458
Fair Value, Measurements, Recurring [Member] | Other government-related debt securities - U.S. [Member]
    
Assets:    
Total available-for-sale investments 1,019 1,030
Fair Value, Measurements, Recurring [Member] | Other government-related debt securities - Foreign and other [Member]
    
Assets:    
Total available-for-sale investments 1,466 1,608
Fair Value, Measurements, Recurring [Member] | Corporate debt securities - Financial [Member]
    
Assets:    
Total available-for-sale investments 3,977 3,361
Fair Value, Measurements, Recurring [Member] | Corporate debt securities - Industrial [Member]
    
Assets:    
Total available-for-sale investments 4,457 4,380
Fair Value, Measurements, Recurring [Member] | Corporate debt securities - Other [Member]
    
Assets:    
Total available-for-sale investments 479 452
Fair Value, Measurements, Recurring [Member] | Residential mortgage-backed securities [Member]
    
Assets:    
Total available-for-sale investments 1,817 1,829
Fair Value, Measurements, Recurring [Member] | Other mortgage- and asset-backed securities [Member]
    
Assets:    
Total available-for-sale investments 1,497 1,767
Fair Value, Measurements, Recurring [Member] | Money market mutual funds [Member]
    
Assets:    
Total available-for-sale investments 1,742 2,620
Fair Value, Measurements, Recurring [Member] | Other short-term interest-bearing securities [Member]
    
Assets:    
Total available-for-sale investments 1,677 2,186
Fair Value, Measurements, Recurring [Member] | Equity securities [Member]
    
Assets:    
Total available-for-sale investments 62 54
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 4,511 7,132
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 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 2,707 4,458
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 1,742 2,620
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 62 54
Fair Value, Measurements, Recurring [Member] | Significant other observable inputs (Level 2) [Member]
    
Derivative Assets:    
Interest rate swap contracts 22  
Total assets 16,527 16,724
Derivative Liabilities:    
Contingent consideration obligations in connection with a business combination 0 0
Total liabilities 93 65
Fair Value, Measurements, Recurring [Member] | Significant other observable inputs (Level 2) [Member] | Foreign currency contracts [Member]
    
Derivative Assets:    
Foreign currency contracts 108 46
Derivative Liabilities:    
Foreign currency contracts 21 59
Fair Value, Measurements, Recurring [Member] | Significant other observable inputs (Level 2) [Member] | Cross currency swap contracts [Member]
    
Derivative Assets:    
Foreign currency contracts 8 65
Derivative Liabilities:    
Foreign currency contracts 72 6
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 1,019 1,030
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 1,466 1,608
Fair Value, Measurements, Recurring [Member] | Significant other observable inputs (Level 2) [Member] | Corporate debt securities - Financial [Member]
    
Assets:    
Total available-for-sale investments 3,977 3,361
Fair Value, Measurements, Recurring [Member] | Significant other observable inputs (Level 2) [Member] | Corporate debt securities - Industrial [Member]
    
Assets:    
Total available-for-sale investments 4,457 4,380
Fair Value, Measurements, Recurring [Member] | Significant other observable inputs (Level 2) [Member] | Corporate debt securities - Other [Member]
    
Assets:    
Total available-for-sale investments 479 452
Fair Value, Measurements, Recurring [Member] | Significant other observable inputs (Level 2) [Member] | Residential mortgage-backed securities [Member]
    
Assets:    
Total available-for-sale investments 1,817 1,829
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 1,497 1,767
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 1,677 2,186
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 222 221
Total liabilities 222 221
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 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 - 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