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Insurance Premiums and Service Revenue Earned Insurance Premiums and Service Revenue Earned (Tables)
 12 Months Ended
Dec. 31, 2016
Insurance Premiums and Service Revenue Earned [Abstract]  
Insurance Premiums and Service Revenue Earned [Table Text Block]
The following table is a summary of insurance premiums and service revenue written and earned.
 
2016
 
2015
 
2014
Year ended December 31, ($ in millions)
Written
 
Earned
 
Written
 
Earned
 
Written
 
Earned
Insurance premiums
 
 
 
 
 
 
 
 
 
 
 
Direct
$
317

 
$
318

 
$
313

 
$
296

 
$
294

 
$
282

Assumed
3

 
5

 
2

 
16

 
43

 
54

Gross insurance premiums
320

 
323

 
315

 
312

 
337

 
336

Ceded
(198
)
 
(141
)
 
(184
)
 
(125
)
 
(156
)
 
(117
)
Net insurance premiums
122

 
182

 
131

 
187

 
181

 
219

Service revenue
826

 
763

 
846

 
753

 
842

 
760

Insurance premiums and service revenue written and earned
$
948

 
$
945

 
$
977

 
$
940

 
$
1,023

 
$
979