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Accumulated Other Comprehensive Loss
 12 Months Ended
Dec. 31, 2012
Accumulated Other Comprehensive Income (Loss) [Abstract]  
Accumulated Other Comprehensive Loss
Accumulated Other Comprehensive Loss.
Accumulated other comprehensive loss consists of the following:
 
December 31,
  
2012
 
2011
 
(in millions)
Post-employment benefits, net of tax
$
(639
)
 
$
(415
)
Hedge instruments, net of tax
(34
)
 
(80
)
Translation adjustments and other, net of tax
(309
)
 
(360
)
 
$
(982
)
 
$
(855
)