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Insurance Premiums and Service Revenue Earned
 12 Months Ended
Dec. 31, 2012
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.
 
2012
 
2011
 
2010
Year ended December 31, ($ in millions)
Written
 
Earned
 
Written
 
Earned
 
Written
 
Earned
Insurance premiums
 
 
 
 
 
 
 
 
 
 
 
Direct
$
332

 
$
335

 
$
342

 
$
309

 
$
330

 
$
308

Assumed
44

 
49

 
38

 
76

 
210

 
281

Gross insurance premiums
376

 
384

 
380

 
385

 
540

 
589

Ceded
(141
)
 
(109
)
 
(129
)
 
(126
)
 
(229
)
 
(228
)
Net insurance premiums
235

 
275

 
251

 
259

 
311

 
361

Service revenue
826

 
780

 
788

 
894

 
718

 
981

Insurance premiums and service revenue written and earned
$
1,061

 
$
1,055

 
$
1,039

 
$
1,153

 
$
1,029

 
$
1,342