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Valuation And Qualifying Accounts
 12 Months Ended
Dec. 31, 2017
Valuation and Qualifying Accounts [Abstract]  
Valuation And Qualifying Accounts
Schedule V
Cincinnati Financial Corporation and Subsidiaries
Valuation and Qualifying Accounts
(Dollars in millions)
 
At December 31,
 
 
2017
 
2016
 
2015
Allowance for doubtful receivables:
 
 

 
 

 
 

Beginning balance, January 1
 
$
5

 
$
4

 
$
3

Additions charged to costs and expenses
 
6

 
5

 
3

Deductions
 
(5
)
 
(4
)
 
(2
)
Ending balance, December 31
 
$
6

 
$
5

 
$
4