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Reinsurance (Tables)
 12 Months Ended
Dec. 31, 2018
Reinsurance Disclosures [Abstract]  
Schedule of effect of reinsurance on premiums - traditional long-duration products[Table Text Block] The effect of reinsurance on premiums for the Company’s traditional long-duration contracts was as follows:
 
Years Ended December 31,
2018
 
2017
 
2016
(in millions)
Direct premiums
$
621

 
$
637

 
$
642

Reinsurance ceded
(225
)
 
(227
)
 
(225
)
Net premiums
$
396

 
$
410

 
$
417
Schedule of effect of reinsurance on premiums - short-duration products [Table Text Block] The effect of reinsurance on premiums for the Company’s short-duration contracts was as follows:
 
Years Ended December 31,
2018
 
2017
 
2016
(in millions)
Written premiums
 
 
 
 
 
Direct
$
1,101

 
$
1,119

 
$
1,085

Ceded
(55
)
 
(171
)
 
(20
)
Total net written premiums
$
1,046

 
$
948

 
$
1,065

Earned premiums
 
 
 
 
 
Direct
$
1,124

 
$
1,107

 
$
1,094

Ceded
(94
)
 
(123
)
 
(20
)
Total net earned premiums
$
1,030

 
$
984

 
$
1,074