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Derivative instruments (Details Textual)
In Millions, unless otherwise specified
 12 Months Ended 12 Months Ended
Dec. 31, 2011
USD ($)
Dec. 31, 2010
USD ($)
Dec. 31, 2009
USD ($)
Dec. 31, 2011
Interest expense, net [Member]
USD ($)
Dec. 31, 2010
Interest expense, net [Member]
USD ($)
Dec. 31, 2009
Interest expense, net [Member]
USD ($)
Dec. 31, 2011
Foreign currency forward contracts [Member]
USD ($)
Dec. 31, 2010
Foreign currency forward contracts [Member]
USD ($)
Dec. 31, 2009
Foreign currency forward contracts [Member]
USD ($)
Dec. 31, 2011
Foreign currency option contracts [Member]
USD ($)
Dec. 31, 2010
Foreign currency option contracts [Member]
USD ($)
Dec. 31, 2009
Foreign currency option contracts [Member]
USD ($)
Dec. 31, 2011
Foreign currency and cross currency swap contracts [Member]
USD ($)
Dec. 31, 2011
Forward interest rate contracts [Member]
USD ($)
Dec. 31, 2011
Rate adjustment to LIBOR on Interest Rate Swap Agreements [Member]
Dec. 31, 2011
Cross currency swap contracts [Member]
USD ($)
Dec. 31, 2011
Cross currency swap contracts [Member]
GBP (£)
Derivative instruments (Textual) [Abstract]                                  
Length of time hedged in foreign currency cash flow hedge Approximately 3 years                                
Notional amount             $ 3,500 $ 3,200 $ 3,400 $ 292 $ 398 $ 376       $ 748 £ 475
Ineffective portions of cash flow hedging instruments (approximately), Gain (loss) 1 (1) (1)                            
Amounts expected to be reclassified from accumulated other comprehensive income into earnings over the next 12 months - gains on foreign currency and cross currency swap                         75        
Amounts expected to be reclassified from accumulated other comprehensive income into earnings over the next 12 months - gain (loss)                           (1)      
Unrealized gain (loss) on the hedged debt       (182) (105) 116                      
Offsetting unrealized gain (loss) on related interest rate swaps       182 105 (116)                      
Foreign currency open contracts - not designated as hedges - notional amounts             389 670 414                
Derivative lower range variable interest rate                             0.30%    
Derivative higher range variable interest rate                             2.60%    
Fixed interest rate for interest received for counterparties on cross currency swap contract                               5.50% 5.50%
Interest rate swap contracts - fair value hedge - notional amounts $ 3,600 $ 3,600 $ 1,500                            
Fixed interest rate for interest paid to counterparties on cross currency swap contracts                               5.80% 5.80%