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Reinsurance (Tables)
 12 Months Ended
Dec. 31, 2017
Reinsurance Disclosures [Abstract]  
Summary of retention limits by period of policy issuance
The following table summarizes those 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 $1 million per life
Effects of reinsurance on premiums and contract charges
The effects of reinsurance on premiums and contract charges for the years ended December 31 are as follows: 
($ in millions)
2017
 
2016
 
2015
Direct
$
734

 
$
715

 
$
728

Assumed
 
 
 
 
 
Affiliate
227

 
138

 
131

Non-affiliate
772

 
803

 
835

Ceded
 
 
 
 
 
Affiliate
(52
)
 
(53
)
 
(41
)
Non-affiliate
(288
)
 
(294
)
 
(315
)
Premiums and contract charges, net of reinsurance
$
1,393

 
$
1,309

 
$
1,338
Effects of reinsurance on contract benefits
The effects of reinsurance on contract benefits for the years ended December 31 are as follows:
($ in millions)
2017
 
2016
 
2015
Direct
$
1,003

 
$
999

 
$
1,023

Assumed
 
 
 
 
 
Affiliate
130

 
90

 
79

Non-affiliate
505

 
522

 
541

Ceded
 
 
 
 
 
Affiliate
(33
)
 
(36
)
 
(32
)
Non-affiliate
(175
)
 
(188
)
 
(205
)
Contract benefits, net of reinsurance
$
1,430

 
$
1,387

 
$
1,406
Effects of reinsurance on interest credited to contractholder funds
The effects of reinsurance on interest credited to contractholder funds for the years ended December 31 are as follows:
($ in millions)
2017
 
2016
 
2015
Direct
$
546

 
$
598

 
$
636

Assumed
 
 
 
 
 
Affiliate
8

 
9

 
10

Non-affiliate
131

 
116

 
111

Ceded
 
 
 
 
 
Affiliate
(21
)
 
(21
)
 
(16
)
Non-affiliate
(25
)
 
(25
)
 
(24
)
Interest credited to contractholder funds, net of reinsurance
$
639

 
$
677

 
$
717
Summary of reinsurance recoverables on paid and unpaid benefits
Reinsurance recoverables on paid and unpaid benefits as of December 31 are summarized in the following table.
($ in millions)
2017
 
2016
Annuities
$
1,357

 
$
1,411

Life insurance
1,243

 
1,299

Other
80

 
81

Total
$
2,680

 
$
2,791