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Accumulated Other Comprehensive Income (Loss) (Tables)
 12 Months Ended
Dec. 31, 2012
Accumulated Other Comprehensive Income (Loss) [Abstract]  
Schedule of accumulated other comprehensive income (loss)
Accumulated Other Comprehensive Income (Loss)
December 31
2012
 
2011
(In millions)
Tax
 
After-tax
 
Tax
 
After-tax
Cumulative foreign currency translation adjustment
$
—

 
$
161

 
$
—

 
$
121

Pension and postretirement benefits
387

 
(721
)
 
326

 
(609
)
Net unrealized gains (losses) on investments with OTTI losses
(11
)
 
20

 
33

 
(64
)
Net unrealized gains (losses) on other investments
(721
)
 
1,371

 
(538
)
 
1,032

Accumulated other comprehensive income (loss)
$
(345
)
 
$
831

 
$
(179
)
 
$
480