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Insurance Premiums and Service Revenue Insurance Premiums and Service Revenue (Tables)
 12 Months Ended
Dec. 31, 2019
Insurance Premiums and Service Revenue [Abstract]  
Insurance Premiums and Service Revenue
The following table is a summary of insurance premiums and service revenue written and earned.
 
2019
 
2018
 
2017
Year ended December 31, ($ in millions)
Written
 
Earned
 
Written
 
Earned
 
Written
 
Earned
Insurance premiums
 
 
 
 
 
 
 
 
 
 
 
Direct
$
491

 
$
464

 
$
420

 
$
414

 
$
384

 
$
364

Assumed
—

 
2

 
—

 
4

 
2

 
5

Gross insurance premiums
491

 
466

 
420

 
418

 
386

 
369

Ceded
(232
)
 
(209
)
 
(219
)
 
(197
)
 
(254
)
 
(188
)
Net insurance premiums
259

 
257

 
201

 
221

 
132

 
181

Service revenue
1,051

 
830

 
973

 
801

 
864

 
792

Insurance premiums and service revenue written and earned
$
1,310

 
$
1,087

 
$
1,174

 
$
1,022

 
$
996

 
$
973