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Reinsurance (Tables)
 6 Months Ended
Jun. 30, 2018
Reinsurance Disclosures [Abstract]  
Effects of reinsurance on premiums and contract charges
The effects of reinsurance on premiums and contract charges are as follows:
($ in millions)
Three months ended June 30,
 
Six months ended June 30,
 
2018
 
2017
 
2018
 
2017
Direct
$
184

 
$
183

 
$
369

 
$
363

Assumed
 
 
 
 
 
 
 
Affiliate
61

 
55

 
121

 
108

Non-affiliate
185

 
193

 
374

 
391

Ceded
 
 
 
 
 
 
 
Affiliate
(12
)
 
(13
)
 
(25
)
 
(26
)
Non-affiliate
(70
)
 
(71
)
 
(138
)
 
(141
)
Premiums and contract charges, net of reinsurance
$
348

 
$
347

 
$
701

 
$
695
Effects of reinsurance on contract benefits
The effects of reinsurance on contract benefits are as follows:
($ in millions)
Three months ended June 30,
 
Six months ended June 30,
 
2018
 
2017
 
2018
 
2017
Direct
$
266

 
$
257

 
$
523

 
$
516

Assumed
 
 
 
 
 
 
 
Affiliate
34

 
34

 
68

 
63

Non-affiliate
123

 
147

 
257

 
263

Ceded
 
 
 
 
 
 
 
Affiliate
(8
)
 
(8
)
 
(20
)
 
(16
)
Non-affiliate
(58
)
 
(66
)
 
(101
)
 
(108
)
Contract benefits, net of reinsurance
$
357

 
$
364

 
$
727

 
$
718
Effects of reinsurance on interest credited to contractholder funds
The effects of reinsurance on interest credited to contractholder funds are as follows:
($ in millions)
Three months ended June 30,
 
Six months ended June 30,
 
2018
 
2017
 
2018
 
2017
Direct
$
129

 
$
140

 
$
259

 
$
276

Assumed
 
 
 
 
 
 
 
Affiliate
2

 
2

 
4

 
4

Non-affiliate
33

 
31

 
58

 
64

Ceded
 
 
 
 
 
 
 
Affiliate
(5
)
 
(6
)
 
(10
)
 
(11
)
Non-affiliate
(7
)
 
(6
)
 
(11
)
 
(11
)
Interest credited to contractholder funds, net of reinsurance
$
152

 
$
161

 
$
300

 
$
322