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Insurance Premiums and Service Revenue Insurance Premiums and Service Revenue (Notes)
 12 Months Ended
Dec. 31, 2019
Insurance Premiums and Service Revenue [Abstract]  
Premiums Receivable Note 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


Premiums Receivable and Other Insurance Assets
Premiums receivable and other insurance assets consisted of the following.
December 31, ($ in millions)
 
2019
 
2018
Prepaid reinsurance premiums
 
$
551

 
$
527

Reinsurance recoverable on unpaid losses
 
88

 
96

Reinsurance recoverable on paid losses
 
23

 
22

Premiums receivable
 
105

 
88

Deferred policy acquisition costs
 
1,791

 
1,593

Total premiums receivable and other insurance assets
 
$
2,558


$
2,326