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Insurance Premiums and Service Revenue Earned
 12 Months Ended
Dec. 31, 2018
Insurance Premiums and Service Revenue Earned [Abstract]  
Insurance Premiums and Service Revenue Earned
Insurance Premiums and Service Revenue Earned
The following table is a summary of insurance premiums and service revenue written and earned.
 
2018
 
2017
 
2016
Year ended December 31, ($ in millions)
Written
 
Earned
 
Written
 
Earned
 
Written
 
Earned
Insurance premiums
 
 
 
 
 
 
 
 
 
 
 
Direct
$
420

 
$
414

 
$
384

 
$
364

 
$
317

 
$
318

Assumed
—

 
4

 
2

 
5

 
3

 
5

Gross insurance premiums
420

 
418

 
386

 
369

 
320

 
323

Ceded
(219
)
 
(197
)
 
(254
)
 
(188
)
 
(198
)
 
(141
)
Net insurance premiums
201

 
221

 
132

 
181

 
122

 
182

Service revenue
973

 
801

 
864

 
792

 
826

 
763

Insurance premiums and service revenue written and earned
$
1,174

 
$
1,022

 
$
996

 
$
973

 
$
948

 
$
945