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Shareholders' Equity and Per Share Data (Tables)
 12 Months Ended
Dec. 31, 2012
Shareholders' Equity and Per Share Data [Abstract]  
Schedule of Accumulated Other Comprehensive Income (Loss)
 
As of December 31,
 
2012
 
2011
 
(in millions)
Unrecognized net periodic pension and postretirement benefit cost
$
(1,169
)
 
$
(830
)
Unrealized net gains related to investments
9

 
7

Foreign currency translation adjustments
27

 
31

Accumulated other comprehensive loss
$
(1,133
)
 
$
(792
)