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Accumulated Other Comprehensive Loss (Tables)
 6 Months Ended 12 Months Ended
Jun. 30, 2012
Dec. 31, 2011
Accumulated Other Comprehensive Income (Loss) [Abstract]    
Schedule of Accumulated Other Comprehensive Income (Loss)
Accumulated other comprehensive loss consists of the following:
  
June 30, 2012
 
December 31, 2011
 
(in millions)
Post-employment benefits, net of tax
$
(406
)
 
$
(415
)
Hedge instruments, net of tax
(66
)
 
(80
)
Translation adjustments and other, net of tax
(386
)
 
(360
)
 
$
(858
)
 
$
(855
)
Accumulated other comprehensive loss consists of the following:
 
December 31,
 
2011
 
2010
  
(in millions)
Post-employment benefits, net of tax
$
(415
)
 
$
(283
)
Hedge instruments, net of tax
(80
)
 
(81
)
Translation adjustments and other, net of tax
(360
)
 
(233
)
  
$
(855
)
 
$
(597
)