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Derivative instruments (Details Textual) (USD $)
In Millions, unless otherwise specified
6 Months Ended 3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2014
Interest expense, net [Member]
Jun. 30, 2013
Interest expense, net [Member]
Jun. 30, 2014
Interest expense, net [Member]
Jun. 30, 2013
Interest expense, net [Member]
Jun. 30, 2014
Foreign currency forward contracts [Member]
Designated as Hedging Instrument [Member]
Dec. 31, 2013
Foreign currency forward contracts [Member]
Designated as Hedging Instrument [Member]
Jun. 30, 2014
Foreign currency forward contracts [Member]
Not Designated as Hedging Instrument [Member]
Dec. 31, 2013
Foreign currency forward contracts [Member]
Not Designated as Hedging Instrument [Member]
Jun. 30, 2014
Foreign currency option contracts [Member]
Designated as Hedging Instrument [Member]
Dec. 31, 2013
Foreign currency option contracts [Member]
Designated as Hedging Instrument [Member]
Jun. 30, 2014
Foreign currency and cross currency swap contracts [Member]
Jun. 30, 2014
Forward interest rate contracts [Member]
Jun. 30, 2014
Interest rate swap [Member]
Designated as Hedging Instrument [Member]
Dec. 31, 2013
Interest rate swap [Member]
Designated as Hedging Instrument [Member]
Jun. 30, 2014
Rate adjustment to LIBOR on interest rate swap agreements [Member]
LIBOR [Member]
Dec. 31, 2013
Rate adjustment to LIBOR on interest rate swap agreements [Member]
LIBOR [Member]
Derivative Instruments Gain Loss [Line Items]                                  
Length of time hedged in foreign currency contracts 3 years                                
Derivative, notional amount           $ 4,000 $ 4,000 $ 878 $ 999 $ 342 $ 516     $ 2,250 $ 4,400    
Amounts expected to be reclassified from AOCI into earnings over the next 12 months - losses                       36          
Amounts expected to be reclassified from AOCI into earnings over the next 12 months - losses                         1        
Derivative lower range variable interest rate                               0.40% 1.10%
Derivative higher range variable interest rate                               0.60% 2.00%
Unrealized gain (loss) on the hedged debt   (63) 113 (125) 91                        
Unrealized gain (loss) on interest rate swaps   $ 63 $ (113) $ 125 $ (91)