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Insurance Premiums and Service Revenue Earned (Tables)
 12 Months Ended
Dec. 31, 2014
Premiums Written and 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.
 
2014
 
2013
 
2012
Year ended December 31, ($ in millions)
Written
 
Earned
 
Written
 
Earned
 
Written
 
Earned
Insurance premiums
 
 
 
 
 
 
 
 
 
 
 
Direct
$
294

 
$
282

 
$
270

 
$
305

 
$
332

 
$
335

Assumed
43

 
54

 
61

 
58

 
44

 
49

Gross insurance premiums
337

 
336

 
331

 
363

 
376

 
384

Ceded
(156
)
 
(117
)
 
(172
)
 
(120
)
 
(141
)
 
(109
)
Net insurance premiums
181

 
219

 
159

 
243

 
235

 
275

Service revenue
842

 
760

 
838

 
769

 
826

 
780

Insurance premiums and service revenue written and earned
$
1,023

 
$
979

 
$
997

 
$
1,012

 
$
1,061

 
$
1,055