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Insurance Premiums and Service Revenue Earned
 12 Months Ended
Dec. 31, 2015
Premiums Written and 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.
 
2015
 
2014
 
2013
Year ended December 31, ($ in millions)
Written
 
Earned
 
Written
 
Earned
 
Written
 
Earned
Insurance premiums
 
 
 
 
 
 
 
 
 
 
 
Direct
$
313

 
$
296

 
$
294

 
$
282

 
$
270

 
$
305

Assumed
2

 
16

 
43

 
54

 
61

 
58

Gross insurance premiums
315

 
312

 
337

 
336

 
331

 
363

Ceded
(184
)
 
(125
)
 
(156
)
 
(117
)
 
(172
)
 
(120
)
Net insurance premiums
131

 
187

 
181

 
219

 
159

 
243

Service revenue
846

 
753

 
842

 
760

 
838

 
769

Insurance premiums and service revenue written and earned
$
977

 
$
940

 
$
1,023

 
$
979

 
$
997

 
$
1,012