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Liability For Unpaid Claims And Claim Adjustment Expenses - Incurred and Paid Claims Development (Details) $ in Millions	Dec. 31, 2024 USD ($) claim	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)	May 25, 2022 USD ($)	May 24, 2022 USD ($)	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)
Claims Development [Line Items]
IBNR & Expected Development on Reported Losses	$ 7	$ 4
Liabilities for claims and claim adjustment expenses, net of reinsurance	1,338	1,355	$ 1,263	$ 1,215	$ 1,215	$ 1,167
Liability
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	4,425
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	3,410
All outstanding liabilities before 2015, net of reinsurance	26
Liabilities for claims and claim adjustment expenses, net of reinsurance	1,041
Professional
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	9
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	7
All outstanding liabilities before 2015, net of reinsurance	0
Liabilities for claims and claim adjustment expenses, net of reinsurance	2
Property
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	4,881
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	4,683
All outstanding liabilities before 2015, net of reinsurance	0
Liabilities for claims and claim adjustment expenses, net of reinsurance	198
Specialty
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	684
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	680
All outstanding liabilities before 2015, net of reinsurance	0
Liabilities for claims and claim adjustment expenses, net of reinsurance	4
2015 | Liability
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	338	339	340			341	$ 341	$ 340	$ 346	$ 345	$ 351	$ 355
IBNR & Expected Development on Reported Losses	$ 2
Cumulative Number of Reported Claims | claim	43,968
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	$ 332	329	327			324	318	308	280	240	186	101
2015 | Professional
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	1	1	1			1	1	1	1	1	1	1
IBNR & Expected Development on Reported Losses	$ 0
Cumulative Number of Reported Claims | claim	71
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	$ 1	1	1			1	1	1	1	1	1	0
2015 | Property
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	322	322	322			322	322	322	323	323	324	328
IBNR & Expected Development on Reported Losses	$ 0
Cumulative Number of Reported Claims | claim	77,339
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	$ 322	322	322			322	322	321	321	318	313	269
2015 | Specialty
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	46	46	46			46	46	46	46	46	46	47
IBNR & Expected Development on Reported Losses	$ 0
Cumulative Number of Reported Claims | claim	20,776
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	$ 46	46	46			46	46	46	46	46	46	$ 35
2016 | Liability
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	355	357	358			356	359	364	368	373	384
IBNR & Expected Development on Reported Losses	$ 2
Cumulative Number of Reported Claims | claim	46,601
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	$ 346	342	338			330	314	294	253	196	111
2016 | Professional
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	1	1	1			1	1	1	1	1	1
IBNR & Expected Development on Reported Losses	$ 0
Cumulative Number of Reported Claims | claim	62
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	$ 1	1	1			1	1	1	1	0	0
2016 | Property
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	360	360	360			360	360	360	359	361	363
IBNR & Expected Development on Reported Losses	$ 0
Cumulative Number of Reported Claims | claim	86,839
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	$ 360	360	360			360	359	358	355	350	298
2016 | Specialty
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	76	76	76			76	76	76	76	76	76
IBNR & Expected Development on Reported Losses	$ 0
Cumulative Number of Reported Claims | claim	26,657
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	$ 76	76	76			76	76	76	76	76	$ 60
2017 | Liability
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	391	391	393			395	394	398	406	415
IBNR & Expected Development on Reported Losses	$ 5
Cumulative Number of Reported Claims | claim	53,691
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	$ 374	366	359			344	322	290	233	116
2017 | Professional
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	1	1	1			1	1	1	1	1
IBNR & Expected Development on Reported Losses	$ 0
Cumulative Number of Reported Claims | claim	66
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	$ 1	1	1			1	1	0	0	0
2017 | Property
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	394	394	394			394	395	398	399	393
IBNR & Expected Development on Reported Losses	$ 0
Cumulative Number of Reported Claims | claim	106,058
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	$ 394	393	393			393	393	391	384	321
2017 | Specialty
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	95	95	95			95	95	95	95	95
IBNR & Expected Development on Reported Losses	$ 0
Cumulative Number of Reported Claims | claim	31,886
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	$ 95	95	95			95	95	95	95	$ 74
2018 | Liability
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	393	396	403			409	420	436	454
IBNR & Expected Development on Reported Losses	$ 6
Cumulative Number of Reported Claims | claim	57,338
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	$ 374	362	353			329	297	242	127
2018 | Professional
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	1	1	1			1	1	1	1
IBNR & Expected Development on Reported Losses	$ 0
Cumulative Number of Reported Claims | claim	57
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	$ 1	1	1			1	1	1	0
2018 | Property
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	420	420	420			420	419	423	423
IBNR & Expected Development on Reported Losses	$ 0
Cumulative Number of Reported Claims | claim	89,497
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	$ 420	419	419			416	413	407	340
2018 | Specialty
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	90	90	90			90	90	90	90
IBNR & Expected Development on Reported Losses	$ 0
Cumulative Number of Reported Claims | claim	30,505
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	$ 90	90	90			90	90	90	$ 73
2019 | Liability
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	428	435	443			456	469	483
IBNR & Expected Development on Reported Losses	$ 13
Cumulative Number of Reported Claims | claim	52,054
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	$ 395	378	350			310	256	133
2019 | Professional
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	1	1	1			1	1	1
IBNR & Expected Development on Reported Losses	$ 0
Cumulative Number of Reported Claims | claim	53
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	$ 1	1	1			1	1	1
2019 | Property
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	416	416	416			415	418	425
IBNR & Expected Development on Reported Losses	$ 0
Cumulative Number of Reported Claims | claim	86,169
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	$ 416	415	413			409	402	341
2019 | Specialty
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	83	83	83			83	83	83
IBNR & Expected Development on Reported Losses	$ 0
Cumulative Number of Reported Claims | claim	27,523
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	$ 83	83	83			83	83	$ 61
2020 | Liability
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	366	374	386			401	436
IBNR & Expected Development on Reported Losses	$ 16
Cumulative Number of Reported Claims | claim	40,918
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	$ 326	300	264			214	114
2020 | Professional
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	1	1	1			1	1
IBNR & Expected Development on Reported Losses	$ 0
Cumulative Number of Reported Claims | claim	53
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	$ 1	1	1			1	1
2020 | Property
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	461	459	457			458	465
IBNR & Expected Development on Reported Losses	$ 0
Cumulative Number of Reported Claims | claim	78,223
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	$ 459	455	452			445	370
2020 | Specialty
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	69	69	69			69	70
IBNR & Expected Development on Reported Losses	$ 0
Cumulative Number of Reported Claims | claim	27,183
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	$ 69	69	69			68	$ 48
2021 | Liability
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	467	477	488			498
IBNR & Expected Development on Reported Losses	$ 35
Cumulative Number of Reported Claims | claim	45,025
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	$ 375	330	272			140
2021 | Professional
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	0	1	0			1
IBNR & Expected Development on Reported Losses	$ 0
Cumulative Number of Reported Claims | claim	46
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	$ 0	0	0			0
2021 | Property
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	513	514	515			510
IBNR & Expected Development on Reported Losses	$ 1
Cumulative Number of Reported Claims | claim	78,859
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	$ 510	508	500			411
2021 | Specialty
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	47	47	47			55
IBNR & Expected Development on Reported Losses	$ 0
Cumulative Number of Reported Claims | claim	20,482
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	$ 47	47	46			$ 36
2022 | Liability
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	519	530	548
IBNR & Expected Development on Reported Losses	$ 66
Cumulative Number of Reported Claims | claim	42,831
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	$ 370	296	153
2022 | Professional
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	1	1	1
IBNR & Expected Development on Reported Losses	$ 0
Cumulative Number of Reported Claims | claim	30
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	$ 1	1	1
2022 | Property
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	601	599	590
IBNR & Expected Development on Reported Losses	$ 4
Cumulative Number of Reported Claims | claim	79,859
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	$ 590	581	472
2022 | Specialty
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	56	57	62
IBNR & Expected Development on Reported Losses	$ 0
Cumulative Number of Reported Claims | claim	17,889
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	$ 56	55	$ 41
2023 | Liability
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	599	603
IBNR & Expected Development on Reported Losses	$ 107
Cumulative Number of Reported Claims | claim	52,816
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	$ 351	189
2023 | Professional
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	1	0
IBNR & Expected Development on Reported Losses	$ 0
Cumulative Number of Reported Claims | claim	27
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	$ 0	0
2023 | Property
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	716	726
IBNR & Expected Development on Reported Losses	$ 13
Cumulative Number of Reported Claims | claim	91,921
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	$ 685	568
2023 | Specialty
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	108	106
IBNR & Expected Development on Reported Losses	$ 1
Cumulative Number of Reported Claims | claim	23,351
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	$ 105	$ 78
2024 | Liability
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	569
IBNR & Expected Development on Reported Losses	$ 219
Cumulative Number of Reported Claims | claim	51,650
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	$ 167
2024 | Professional
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	1
IBNR & Expected Development on Reported Losses	$ 0
Cumulative Number of Reported Claims | claim	27
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	$ 0
2024 | Property
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	678
IBNR & Expected Development on Reported Losses	$ 60
Cumulative Number of Reported Claims | claim	78,320
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	$ 527
2024 | Specialty
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	14
IBNR & Expected Development on Reported Losses	$ 1
Cumulative Number of Reported Claims | claim	19,247
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	$ 13

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Liability as of the balance sheet date for amounts representing estimated cost of settling unpaid claims under the terms of the underlying insurance policies, less estimated reinsurance recoveries on such claims. This includes an estimate for claims which have been incurred but not reported. Claim adjustment expenses represent the costs estimated to be incurred in the settlement of unpaid claims.

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Amount, after reinsurance, of paid claims and allocated claim adjustment expense used in claims development for short-duration insurance contracts. Excludes unallocated claim adjustment expense.

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Undiscounted amount, after reinsurance, of incurred-but-not-reported (IBNR) liabilities plus expected development on reported claims, for claims and allocated claim adjustment expense for short-duration insurance contracts. Excludes unallocated claim adjustment expense.

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Undiscounted amount, after reinsurance, of incurred claims and allocated claim adjustment expense used in claims development for short-duration insurance contracts. Excludes unallocated claim adjustment expense.

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Undiscounted amount, after reinsurance, of the liability for unpaid claims and allocated claim adjustment expense for short-duration insurance contracts for accident years not separately presented in claim development information. Excludes unallocated claim adjustment expense.

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Cumulative number of reported claims for short-duration insurance contracts.

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