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Reinsurance
 6 Months Ended
Jun. 30, 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 June 30,
 
Six months ended June 30,
 
2018
 
2017
 
2018

2017
Property and casualty insurance premiums earned
 
$
(257
)
 
$
(254
)
 
$
(496
)
 
$
(500
)
Life premiums and contract charges
 
(73
)
 
(75
)
 
(145
)
 
(150
)

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 June 30,
 
Six months ended June 30,
 
2018
 
2017
 
2018
 
2017
Property and casualty insurance claims and claims expense
 
$
(138
)
 
$
(124
)
 
$
(325
)
 
$
(255
)
Life contract benefits
 
(66
)
 
(70
)
 
(115
)
 
(117
)
Interest credited to contractholder funds
 
(7
)
 
(6
)
 
(11
)
 
(11
)