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Reinsurance (Tables)
 12 Months Ended
Dec. 31, 2017
Reinsurance Disclosures [Abstract]  
Effects of reinsurance on property-liability insurance premiums written and earned and life and annuity premiums and contract charges

Effects of reinsurance on property and casualty premiums written and earned and life premiums and contract charges
 
 
For the years ended December 31,
($ in millions)
 
2017
 
2016
 
2015
Property and casualty insurance premiums written
 
 
 
 
 
 
Direct
 
$
33,685

 
$
32,614

 
$
31,924

Assumed
 
64

 
47

 
39

Ceded
 
(1,007
)
 
(1,061
)
 
(1,092
)
Property and casualty insurance premiums written, net of reinsurance
 
$
32,742

 
$
31,600

 
$
30,871

 
 
 
 
 
 
 
Property and casualty insurance premiums earned
 
 
 
 
 
 
Direct
 
$
33,221

 
$
32,249

 
$
31,274

Assumed
 
50

 
45

 
41

Ceded
 
(971
)
 
(987
)
 
(1,006
)
Property and casualty insurance premiums earned, net of reinsurance
 
$
32,300

 
$
31,307

 
$
30,309

 
 
 
 
 
 
 
Life premiums and contract charges
 
 
 
 
 
 
Direct
 
$
1,894

 
$
1,766

 
$
1,641

Assumed
 
787

 
818

 
849

Ceded
 
(303
)
 
(309
)
 
(332
)
Life premiums and contract charges, net of reinsurance
 
$
2,378

 
$
2,275

 
$
2,158
Summary of retention limits by period of policy issuance
Retention limits by period of policy issuance
Period
 
Retention limits
April 2015 through current
 
Single life: $2 million per life
Joint life: no longer offered
April 2011 through March 2015
 
Single life: $5 million per life, $3 million age 70 and over, and $10 million for contracts that meet specific criteria
Joint life: $8 million per life, and $10 million for contracts that meet specific criteria
July 2007 through March 2011
 
$5 million per life, $3 million age 70 and over, and $10 million for contracts that meet specific criteria
September 1998 through June 2007
 
$2 million per life, in 2006 the limit was increased to $5 million for instances when specific criteria were met
August 1998 and prior
 
Up to $1 million per life
Summary of reinsurance recoverables on paid and unpaid benefits
Reinsurance recoverables on paid and unpaid benefits
 
 
 As of December 31,
($ in millions)
 
2017
 
2016
Annuities
 
$
1,370

 
$
1,424

Life insurance
 
817

 
860

Other
 
167

 
184

Total
 
$
2,354

 
$
2,468