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Goodwill and Other Intangibles (Tables)
 12 Months Ended
Dec. 31, 2012
Goodwill and Intangible Assets Disclosure [Abstract]  
Changes in the carrying value of goodwill by reporting segment
Changes in the carrying value of goodwill during 2010, 2011 and 2012, by reporting segment, are presented in the following table (in millions):
 
Property and
Casualty
 
Annuity
 
Medicare
Supplement and Critical Illness
 
Total
Balance at January 1, 2010
$
152

 
$
34

 
$
22

 
$
208

Impairment charge
—

 
—

 
(22
)
 
(22
)
Balance at December 31, 2010 and 2011
152

 
34

 
—

 
186

Sale of subsidiary
—

 
(1
)
 
—

 
(1
)
Balance at December 31, 2012
$
152

 
$
33

 
$
—

 
$
185