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Financial Instruments - Foreign Exchange Forward Contracts Representing Commitments to Buy and Sell Various Foreign Currencies (Detail)
In Millions, unless otherwise specified
 12 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended
Dec. 31, 2012
Canadian Dollar [Member]
USD ($)
Dec. 31, 2012
Canadian Dollar [Member]
EUR (€)
Dec. 31, 2012
Canadian Dollar [Member]
2013 [Member]
USD ($)
Dec. 31, 2012
Canadian Dollar [Member]
2013 [Member]
EUR (€)
Dec. 31, 2012
Canadian Dollar [Member]
2013 [Member]
U S Dollar [Member]
Dec. 31, 2012
Canadian Dollar [Member]
2013 [Member]
Euros [Member]
Dec. 31, 2012
Canadian Dollar [Member]
2014 [Member]
USD ($)
Dec. 31, 2012
Canadian Dollar [Member]
2014 [Member]
EUR (€)
Dec. 31, 2012
Canadian Dollar [Member]
2014 [Member]
U S Dollar [Member]
Dec. 31, 2012
Canadian Dollar [Member]
2014 [Member]
Euros [Member]
Dec. 31, 2012
Canadian Dollar [Member]
2015 [Member]
USD ($)
Dec. 31, 2012
Canadian Dollar [Member]
2015 [Member]
EUR (€)
Dec. 31, 2012
Canadian Dollar [Member]
2015 [Member]
U S Dollar [Member]
Dec. 31, 2012
Canadian Dollar [Member]
2016 [Member]
USD ($)
Dec. 31, 2012
Canadian Dollar [Member]
2016 [Member]
EUR (€)
Dec. 31, 2012
Canadian Dollar [Member]
2016 [Member]
U S Dollar [Member]
Dec. 31, 2012
U S Dollar [Member]
MXN
Dec. 31, 2012
U S Dollar [Member]
2013 [Member]
MXN
Dec. 31, 2012
U S Dollar [Member]
2013 [Member]
Mexican Peso [Member]
Dec. 31, 2012
U S Dollar [Member]
2014 [Member]
MXN
Dec. 31, 2012
U S Dollar [Member]
2014 [Member]
Mexican Peso [Member]
Dec. 31, 2012
U S Dollar [Member]
2015 [Member]
MXN
Dec. 31, 2012
U S Dollar [Member]
2015 [Member]
Mexican Peso [Member]
Dec. 31, 2012
U S Dollar [Member]
2016 [Member]
MXN
Dec. 31, 2012
Euros [Member]
USD ($)
Dec. 31, 2012
Euros [Member]
CZK
Dec. 31, 2012
Euros [Member]
GBP (£)
Dec. 31, 2012
Euros [Member]
PLN
Dec. 31, 2012
Euros [Member]
2013 [Member]
USD ($)
Dec. 31, 2012
Euros [Member]
2013 [Member]
CZK
Dec. 31, 2012
Euros [Member]
2013 [Member]
GBP (£)
Dec. 31, 2012
Euros [Member]
2013 [Member]
PLN
Dec. 31, 2012
Euros [Member]
2013 [Member]
U S Dollar [Member]
Dec. 31, 2012
Euros [Member]
2013 [Member]
British Pound [Member]
Dec. 31, 2012
Euros [Member]
2013 [Member]
Czech Koruna [Member]
Dec. 31, 2012
Euros [Member]
2013 [Member]
Polish Zloty [Member]
Dec. 31, 2012
Euros [Member]
2014 [Member]
USD ($)
Dec. 31, 2012
Euros [Member]
2014 [Member]
CZK
Dec. 31, 2012
Euros [Member]
2014 [Member]
GBP (£)
Dec. 31, 2012
Euros [Member]
2014 [Member]
PLN
Dec. 31, 2012
Euros [Member]
2014 [Member]
U S Dollar [Member]
Dec. 31, 2012
Euros [Member]
2014 [Member]
British Pound [Member]
Dec. 31, 2012
Euros [Member]
2014 [Member]
Czech Koruna [Member]
Dec. 31, 2012
Euros [Member]
2014 [Member]
Polish Zloty [Member]
Dec. 31, 2012
Euros [Member]
2015 [Member]
USD ($)
Dec. 31, 2012
Euros [Member]
2015 [Member]
CZK
Dec. 31, 2012
Euros [Member]
2015 [Member]
GBP (£)
Dec. 31, 2012
Euros [Member]
2015 [Member]
PLN
Dec. 31, 2012
Euros [Member]
2015 [Member]
U S Dollar [Member]
Dec. 31, 2012
Euros [Member]
2015 [Member]
British Pound [Member]
Dec. 31, 2012
Euros [Member]
2015 [Member]
Czech Koruna [Member]
Dec. 31, 2012
Euros [Member]
2016 [Member]
USD ($)
Dec. 31, 2012
Euros [Member]
2016 [Member]
CZK
Dec. 31, 2012
Euros [Member]
2016 [Member]
GBP (£)
Dec. 31, 2012
Euros [Member]
2016 [Member]
PLN
Dec. 31, 2012
Euros [Member]
2016 [Member]
U S Dollar [Member]
Derivative [Line Items]                                                                                                                
Notional amount of foreign currency derivatives $ (684) € 74                             6,049               $ (123) 4,833 £ 71 127                                                        
Foreign exchange forward contract, Purchases Exchange Rate         1.01252 1.31881     1.04151 1.31939     1.03073     1.03697     0.07313   0.06844   0.06894                   0.75541 1.17565 0.03988 0.23344         0.74515 1.14482 0.03980 0.22452           1.19170 0.03971          
Foreign exchange forward contract, Sales Exchange Rate         1.02054 1.28626     1.01573       1.01754     1.04751                                 0.76441 1.24572 0.04014           0.77097               0.77597             0.77162
Foreign exchange forward contract, Purchases     229 48     31 34     23      12        3,179   2,071   799              53 2,488 41 86         17 1,572 31 41            784 13                   
Foreign exchange forward contract, Sales     $ (600) € (8)     $ (271)        $ (104)      $ (4)                                  $ (93) (11) £ (14)            $ (52)                  $ (35)                $ (13)