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Insurance Premiums and Service Revenue Earned Insurance Premiums and Service Revenue Earned
 12 Months Ended
Dec. 31, 2017
Insurance Premiums and Service Revenue Earned [Abstract]  
Insurance Premiums and Service Revenue Earned [Text Block]
Insurance Premiums and Service Revenue Earned
The following table is a summary of insurance premiums and service revenue written and earned.
 
2017
 
2016
 
2015
Year ended December 31, ($ in millions)
Written
 
Earned
 
Written
 
Earned
 
Written
 
Earned
Insurance premiums
 
 
 
 
 
 
 
 
 
 
 
Direct
$
384

 
$
364

 
$
317

 
$
318

 
$
313

 
$
296

Assumed
2

 
5

 
3

 
5

 
2

 
16

Gross insurance premiums
386

 
369

 
320

 
323

 
315

 
312

Ceded
(254
)
 
(188
)
 
(198
)
 
(141
)
 
(184
)
 
(125
)
Net insurance premiums
132

 
181

 
122

 
182

 
131

 
187

Service revenue
864

 
792

 
826

 
763

 
846

 
753

Insurance premiums and service revenue written and earned
$
996

 
$
973

 
$
948

 
$
945

 
$
977

 
$
940