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Goodwill and Other Intangibles (Tables)
 12 Months Ended
Dec. 31, 2017
Goodwill and Intangible Assets Disclosure [Abstract]  
Changes in the carrying value of goodwill by reporting segment
Changes in the carrying value of goodwill during 2015, 2016 and 2017, by reporting segment, are presented in the following table (in millions):
 
Property and
Casualty
 
Annuity
 
Total
Balance at January 1, 2015
$
168

 
$
33

 
$
201

Sale of subsidiaries in 2015
—

 
(2
)
 
(2
)
Balance at December 31, 2015, December 31, 2016 and December 31, 2017
$
168

 
$
31

 
$
199