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Reinsurance (Tables)
 12 Months Ended
Dec. 31, 2022
Reinsurance [Abstract]  
Premiums Written And Earned And Incurred Losses And LAE
Years Ended December 31,
(Dollars in millions)
2022
2021
2020
Written premiums:
Direct
$
4,602
$
3,988
$
3,218
Assumed
9,350
9,062
7,264
Ceded
(1,608)
(1,604)
(1,365)
Net written premiums
$
12,344
$
11,446
$
9,117
Premiums earned:
Direct
$
4,218
$
3,589
$
3,028
Assumed
9,082
8,315
7,055
Ceded
(1,513)
(1,498)
(1,401)
Net premiums earned
$
11,787
$
10,406
$
8,682
Incurred losses and LAE:
Direct
$
2,804
$
2,385
$
2,141
Assumed
6,285
5,741
5,164
Ceded
(988)
(735)
(754)
Net incurred losses and LAE
$
8,100
$
7,391
$
6,551