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Financial Instruments (Details) (Forward Contracts [Member])
In Millions, unless otherwise specified
Dec. 31, 2011
For Canadian dollars [Member]
USD ($)
Dec. 31, 2011
For Canadian dollars [Member]
EUR (€)
Dec. 31, 2011
For US dollars [Member]
PHP
Dec. 31, 2011
For Euros [Member]
USD ($)
Dec. 31, 2011
For Euros [Member]
CZK
Dec. 31, 2011
For Euros [Member]
GBP (£)
Dec. 31, 2011
For Euros [Member]
PLN
Dec. 31, 2011
2012 [Member]
For Canadian dollars [Member]
USD ($)
Dec. 31, 2011
2012 [Member]
For Canadian dollars [Member]
EUR (€)
Dec. 31, 2011
2012 [Member]
For US dollars [Member]
PHP
Dec. 31, 2011
2012 [Member]
For Euros [Member]
USD ($)
Dec. 31, 2011
2012 [Member]
For Euros [Member]
CZK
Dec. 31, 2011
2012 [Member]
For Euros [Member]
GBP (£)
Dec. 31, 2011
2012 [Member]
For Euros [Member]
PLN
Dec. 31, 2011
2013 [Member]
For Canadian dollars [Member]
USD ($)
Dec. 31, 2011
2013 [Member]
For Canadian dollars [Member]
EUR (€)
Dec. 31, 2011
2013 [Member]
For US dollars [Member]
PHP
Dec. 31, 2011
2013 [Member]
For Euros [Member]
USD ($)
Dec. 31, 2011
2013 [Member]
For Euros [Member]
CZK
Dec. 31, 2011
2013 [Member]
For Euros [Member]
GBP (£)
Dec. 31, 2011
2013 [Member]
For Euros [Member]
PLN
Dec. 31, 2011
2014 [Member]
For Canadian dollars [Member]
USD ($)
Dec. 31, 2011
2014 [Member]
For Canadian dollars [Member]
EUR (€)
Dec. 31, 2011
2014 [Member]
For US dollars [Member]
PHP
Dec. 31, 2011
2014 [Member]
For Euros [Member]
USD ($)
Dec. 31, 2011
2014 [Member]
For Euros [Member]
CZK
Dec. 31, 2011
2014 [Member]
For Euros [Member]
GBP (£)
Dec. 31, 2011
2014 [Member]
For Euros [Member]
PLN
Dec. 31, 2011
2015 [Member]
For Euros [Member]
GBP (£)
Foreign exchange forward contracts representing commitments to buy and sell various foreign currencies                                                          
Foreign exchange forward contract, Purchases               $ 173 € 31 2,586 $ 33 2,258 £ 67 106 $ 72 € 11 2,111 $ 17 1,672 £ 39 77 $ 14 € 4 1,164 $ 15 760 £ 27 35 £ 8
Foreign exchange forward contract, Purchases Exchange Rate (U.S. dollar)               1.0239 1.0239   0.7204 0.7204 0.7204 0.7204 1.0331 1.0331   0.7188 0.7188 0.7188 0.7188 1.0698 1.0698   0.7411 0.7411 0.7411 0.7411  
Foreign exchange forward contract, Purchases Exchange Rate (Euro)               1.3648 1.3648   1.1878 1.1878 1.1878 1.1878 1.3884 1.3884   1.1707 1.1707 1.1707 1.1707 1.3946 1.3946   1.1312 1.1312 1.1312 1.1312 1.1737
Foreign exchange forward contract, Purchases Exchange Rate (Czech Koruna)                     0.0391 0.0391 0.0391 0.0391       0.0401 0.0401 0.0401 0.0401       0.0402 0.0402 0.0402 0.0402  
Foreign exchange forward contract, Purchases Exchange Rate (Polish Zlotys)                     0.2379 0.2379 0.2379 0.2379       0.2336 0.2336 0.2336 0.2336       0.2252 0.2252 0.2252 0.2252  
Foreign exchange forward contract, Purchases Exchange Rate                   0.0739             0.0730             0.0675          
Foreign exchange forward contract, Sales               (539) (15) (48) (76) (43) (3) (25) (179) 0 0 (42) (11) (1) 0 (48)     (8)        
Foreign exchange forward contract, Sales Exchange Rate (U.S. dollar)               1.0295 1.0295   0.7555 0.7555 0.7555 0.7555 1.0479 1.0479   0.7509 0.7509 0.7509 0.7509 1.0312 1.0312   0.7390 0.7390 0.7390 0.7390  
Foreign exchange forward contract, Sales Exchange Rate (Euro)               1.3690 1.3690   1.1089 1.1089 1.1089 1.1089 0 0   1.1447 1.1447 1.1447 1.1447                
Foreign exchange forward contract, Sales Exchange Rate (Czech Koruna)                     0.0409 0.0409 0.0409 0.0409       0.0401 0.0401 0.0401 0.0401                
Foreign exchange forward contract, Sales Exchange Rate (Polish Zlotys)                     0.2314 0.2314 0.2314 0.2314       0.0000 0.0000 0.0000 0.0000                
Foreign exchange forward contract, Sales Exchange Rate                   0.0716             0.0000                        
Notional Amount of Foreign Currency Derivatives $ (507) € 31 5,813 $ (61) 4,636 £ 137 193