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Insurance Premiums and Service Revenue Earned
 12 Months Ended
Dec. 31, 2011
Premiums Written and Earned [Abstract]  
Insurance Premiums and Service Revenue Earned
3.    Insurance Premiums and Service Revenue Earned
The following table is a summary of insurance premiums and service revenue written and earned.
 
2011
 
2010
 
2009
Year ended December 31, ($ in millions)
Written
 
Earned
 
Written
 
Earned
 
Written
 
Earned
Insurance premiums
 
 
 
 
 
 
 
 
 
 
 
Direct
$
817

 
$
742

 
$
803

 
$
734

 
$
728

 
$
779

Assumed
38

 
77

 
210

 
281

 
576

 
662

Gross insurance premiums
855

 
819

 
1,013

 
1,015

 
1,304

 
1,441

Ceded
(167
)
 
(164
)
 
(267
)
 
(266
)
 
(603
)
 
(694
)
Net insurance premiums
688

 
655

 
746

 
749

 
701

 
747

Service revenue
815

 
918

 
743

 
1,001

 
661

 
1,114

Insurance premiums and service revenue written and earned
$
1,503

 
$
1,573

 
$
1,489

 
$
1,750

 
$
1,362

 
$
1,861