Premiums Receivable and Other Insurance Assets Premiums Receivable and Other Insurance Assets (Tables)

12 Months Ended

Dec. 31, 2017

Premiums Receivable and Other Insurance Assets [Abstract]

Premiums Receivable and Other Insurance Assets [Table Text Block]

Premiums receivable and other insurance assets consisted of the following.

December 31, ($ in millions)	2017		2016
Prepaid reinsurance premiums	$	507	$	439
Reinsurance recoverable on unpaid losses	108		108
Reinsurance recoverable on paid losses	19		20
Premiums receivable	84		80
Deferred policy acquisition costs	1,329		1,258
Total premiums receivable and other insurance assets	$	2,047	$	1,905