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Reinsurance (Tables)
 12 Months Ended
Dec. 31, 2019
Reinsurance Disclosures [Abstract]  
Summary of reinsurance financial data [Table Text Block]
The following is a summary of reinsurance financial data reflected in the consolidated statement of income:
(for the year ended December 31, in millions)
 
2019
 
2018
 
2017
Written premiums
 
 
 
 
 
 
Direct
 
$
30,022

 
$
28,210

 
$
26,648

Assumed
 
1,041

 
1,042

 
1,000

Ceded
 
(1,912
)
 
(1,544
)
 
(1,429
)
Total net written premiums
 
$
29,151

 
$
27,708

 
$
26,219

Earned premiums
 
 
 
 
 
 
Direct
 
$
28,994

 
$
27,536

 
$
26,189

Assumed
 
1,076

 
1,024

 
965

Ceded
 
(1,798
)
 
(1,501
)
 
(1,471
)
Total net earned premiums
 
$
28,272

 
$
27,059

 
$
25,683

Percentage of assumed earned premiums to net earned premiums
 
3.8
%
 
3.8
%
 
3.8
%
Ceded claims and claim adjustment expenses incurred
 
$
1,089

 
$
1,293

 
$
1,225
Reinsurance recoverables [Table Text Block]
Reinsurance recoverables include amounts recoverable on both paid and unpaid claims and claim adjustment expenses and were as follows:
(at December 31, in millions)
 
2019
 
2018
Gross reinsurance recoverables on paid and unpaid claims and claim adjustment expenses
 
$
3,476

 
$
3,485

Allowance for uncollectible reinsurance
 
(92
)
 
(110
)
Net reinsurance recoverables
 
3,384

 
3,375

Mandatory pools and associations
 
1,886

 
2,005

Structured settlements
 
2,965

 
2,990

Total reinsurance recoverables
 
$
8,235

 
$
8,370