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Accumulated Other Comprehensive Income (Loss) (Tables)
 12 Months Ended
Dec. 31, 2011
Accumulated Other Comprehensive Income (Loss) [Abstract]  
Schedule of accumulated other comprehensive income (loss)
Accumulated Other Comprehensive Income (Loss)
December 31
2011
 
2010
(In millions)
Tax
 
After-tax
 
Tax
 
After-tax
Cumulative foreign currency translation adjustment
$
—

 
$
121

 
$
—

 
$
136

Pension and postretirement benefits
326

 
(609
)
 
220

 
(409
)
Net unrealized gains (losses) on investments with OTTI losses
33

 
(64
)
 
39

 
(73
)
Net unrealized gains (losses) on other investments
(533
)
 
1,022

 
(348
)
 
691

Accumulated other comprehensive loss attributable to noncontrolling interests
—

 
—

 
—

 
(19
)
Accumulated other comprehensive income (loss)
$
(174
)
 
$
470

 
$
(89
)
 
$
326