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Reinsurance
 3 Months Ended
Mar. 31, 2018
Reinsurance Disclosures [Abstract]  
Reinsurance
Note 9
Reinsurance
Effects of reinsurance ceded on property and casualty premiums earned and life premiums and contract charges

($ in millions)
 
Three months ended March 31,
 
2018
 
2017
Property and casualty insurance premiums earned
 
$
(239
)
 
$
(246
)
Life premiums and contract charges
 
(72
)
 
(75
)

Effects of reinsurance ceded on property and casualty insurance claims and claims expense, life contract benefits and interest credited to contractholder funds
($ in millions)
 
Three months ended March 31,
 
2018
 
2017
Property and casualty insurance claims and claims expense
 
$
(187
)
 
$
(131
)
Life contract benefits
 
(49
)
 
(47
)
Interest credited to contractholder funds
 
(4
)
 
(5
)