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Reinsurance (Tables)
 9 Months Ended
Sep. 30, 2018
Reinsurance Disclosures [Abstract]  
Schedule of reductions to premiums and contract charges due to reinsurance premium ceded amounts
Effects of reinsurance ceded on property and casualty premiums earned and life premiums and contract charges

($ in millions)
 
Three months ended September 30,
 
Nine months ended September 30,
 
2018
 
2017
 
2018

2017
Property and casualty insurance premiums earned
 
$
(260
)
 
$
(245
)
 
$
(756
)
 
$
(745
)
Life premiums and contract charges
 
(76
)
 
(75
)
 
(221
)
 
(225
)
Schedule of reductions to costs and expenses due to reinsurance ceded amounts
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 September 30,
 
Nine months ended September 30,
 
2018
 
2017
 
2018
 
2017
Property and casualty insurance claims and claims expense (1)
 
$
(247
)
 
$
(1,268
)
 
$
(572
)
 
$
(1,523
)
Life contract benefits
 
(35
)
 
(47
)
 
(150
)
 
(164
)
Interest credited to contractholder funds
 
(5
)
 
(6
)
 
(16
)
 
(17
)

(1) 
Includes expected reinsurance recoveries on catastrophe losses related to homeowners flood claims covered by the National Flood Insurance Program.