Insurance Liabilities - Undiscounted, Incurred and Paid Losses and Allocated Loss Adjustment Expenses (Details) $ in Millions	12 Months Ended
	Dec. 31, 2022 USD ($) country	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)
Liability for Claims and Claims Adjustment Expense [Line Items]
2022 Prior Year Development Excluding the Impact of ADC	$ (530)
Prior Year Development Net of External Reinsurance After ADC Cessions(a)	(356)
U.S. Workers' Compensation (before discount)
Liability for Claims and Claims Adjustment Expense [Line Items]
Incurred losses and allocated loss adjustment expenses, undiscounted and net of reinsurance	10,163
2022 Prior Year Development Excluding the Impact of ADC	(644)
Incurred Impact of ADC	(4,686)
2022 (Net of Impact of ADC)	8,946
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance from the table below	5,905
Liabilities for losses and loss adjustment expenses and prior year development before accident year 2013, net of reinsurance	4,390
Liabilities for losses and loss adjustment expenses and prior year loss development, net of reinsurance	8,648
Prior Year Development Net of External Reinsurance After ADC Cessions(a)	(338)
Paid Impact of ADC	$ (170)
Year 1 (as a percent)	12.40%
Year 2 (as a percent)	17.50%
Year 3 (as a percent)	11.50%
Year 4 (as a percent)	7.30%
Year 5 (as a percent)	5.20%
Year 6 (as a percent)	3.50%
Year 7 (as a percent)	2.40%
Year 8 (as a percent)	2.00%
Year 9 (as a percent)	2.20%
Year 10 (as a percent)	2.70%
U.S. Workers' Compensation (before discount) | Adverse Development Reinsurance
Liability for Claims and Claims Adjustment Expense [Line Items]
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance from the table below	$ 170
Liabilities for losses and loss adjustment expenses and prior year development before accident year 2013, net of reinsurance	(3,639)
Unallocated loss adjustment expense prior year development	12
Prior Year Development Net of External Reinsurance After ADC Cessions(a)	306
U.S. Workers' Compensation (before discount) | 2013
Liability for Claims and Claims Adjustment Expense [Line Items]
Incurred losses and allocated loss adjustment expenses, undiscounted and net of reinsurance	1,878	$ 1,877	$ 1,886	$ 1,916	$ 1,974	$ 2,032	$ 2,060	$ 1,950	$ 1,880	$ 1,932
2022 Prior Year Development Excluding the Impact of ADC	1
Total of IBNR Liabilities Plus Expected Development on Reported Losses	$ 116
Cumulative Number of Reported Claims | country	48,545
Incurred Impact of ADC	$ (326)
IBNR Impact of ADC	(103)
2022 (Net of Impact of ADC)	1,552	1,504	1,520	1,458	1,481	1,494	1,500
Total of IBNR Liabilities Net of Impact of ADC	13
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance from the table below	1,472	1,422	1,372	1,335	1,287	1,214	1,067	879	619	282
Prior Year Development Net of External Reinsurance After ADC Cessions(a)	48
Paid Impact of ADC	(74)
U.S. Workers' Compensation (before discount) | 2013 | Adverse Development Reinsurance
Liability for Claims and Claims Adjustment Expense [Line Items]
Incurred Impact of ADC	(326)	(373)	(366)	(458)	(493)	(538)	(560)
Prior Year Development Net of External Reinsurance After ADC Cessions(a)	47
U.S. Workers' Compensation (before discount) | 2014
Liability for Claims and Claims Adjustment Expense [Line Items]
Incurred losses and allocated loss adjustment expenses, undiscounted and net of reinsurance	1,614	1,637	1,679	1,709	1,794	1,862	1,866	1,764	1,729
2022 Prior Year Development Excluding the Impact of ADC	(23)
Total of IBNR Liabilities Plus Expected Development on Reported Losses	$ 213
Cumulative Number of Reported Claims | country	40,986
Incurred Impact of ADC	$ (371)
IBNR Impact of ADC	(164)
2022 (Net of Impact of ADC)	1,243	1,171	1,223	1,329	1,309	1,310	1,311
Total of IBNR Liabilities Net of Impact of ADC	49
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance from the table below	1,207	1,180	1,137	1,096	1,030	930	786	558	231
Prior Year Development Net of External Reinsurance After ADC Cessions(a)	72
Paid Impact of ADC	(53)
U.S. Workers' Compensation (before discount) | 2014 | Adverse Development Reinsurance
Liability for Claims and Claims Adjustment Expense [Line Items]
Incurred Impact of ADC	(371)	(466)	(456)	(380)	(485)	(552)	(555)
Prior Year Development Net of External Reinsurance After ADC Cessions(a)	95
U.S. Workers' Compensation (before discount) | 2015
Liability for Claims and Claims Adjustment Expense [Line Items]
Incurred losses and allocated loss adjustment expenses, undiscounted and net of reinsurance	1,612	1,634	1,675	1,722	1,814	1,866	1,864	1,708
2022 Prior Year Development Excluding the Impact of ADC	(22)
Total of IBNR Liabilities Plus Expected Development on Reported Losses	$ 395
Cumulative Number of Reported Claims | country	36,645
Incurred Impact of ADC	$ (520)
IBNR Impact of ADC	(311)
2022 (Net of Impact of ADC)	1,092	1,041	1,105	1,134	1,318	1,279	1,279
Total of IBNR Liabilities Net of Impact of ADC	84
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance from the table below	1,038	1,013	979	925	854	725	524	234
Prior Year Development Net of External Reinsurance After ADC Cessions(a)	51
Paid Impact of ADC	(43)
U.S. Workers' Compensation (before discount) | 2015 | Adverse Development Reinsurance
Liability for Claims and Claims Adjustment Expense [Line Items]
Incurred Impact of ADC	(520)	(593)	(570)	(588)	(496)	(587)	(585)
Prior Year Development Net of External Reinsurance After ADC Cessions(a)	73
U.S. Workers' Compensation (before discount) | 2016
Liability for Claims and Claims Adjustment Expense [Line Items]
Incurred losses and allocated loss adjustment expenses, undiscounted and net of reinsurance	1,036	1,075	1,090	1,140	1,318	1,346	1,299
2022 Prior Year Development Excluding the Impact of ADC	(39)
Total of IBNR Liabilities Plus Expected Development on Reported Losses	$ 241
Cumulative Number of Reported Claims | country	31,540
Incurred Impact of ADC	$ 0
IBNR Impact of ADC	0
2022 (Net of Impact of ADC)	1,036	1,075	1,090	1,140	1,318	1,346	1,299
Total of IBNR Liabilities Net of Impact of ADC	241
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance from the table below	686	662	630	584	521	378	147
Prior Year Development Net of External Reinsurance After ADC Cessions(a)	(39)
Paid Impact of ADC	0
U.S. Workers' Compensation (before discount) | 2016 | Adverse Development Reinsurance
Liability for Claims and Claims Adjustment Expense [Line Items]
Incurred Impact of ADC	0	0	0	0	0	0	0
Prior Year Development Net of External Reinsurance After ADC Cessions(a)	0
U.S. Workers' Compensation (before discount) | 2017
Liability for Claims and Claims Adjustment Expense [Line Items]
Incurred losses and allocated loss adjustment expenses, undiscounted and net of reinsurance	712	731	763	776	850	789
2022 Prior Year Development Excluding the Impact of ADC	(19)
Total of IBNR Liabilities Plus Expected Development on Reported Losses	$ 231
Cumulative Number of Reported Claims | country	27,312
Incurred Impact of ADC	$ 0
IBNR Impact of ADC	0
2022 (Net of Impact of ADC)	712	731	763	776	850	789
Total of IBNR Liabilities Net of Impact of ADC	231
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance from the table below	389	367	333	294	224	93
Prior Year Development Net of External Reinsurance After ADC Cessions(a)	(19)
Paid Impact of ADC	0
U.S. Workers' Compensation (before discount) | 2017 | Adverse Development Reinsurance
Liability for Claims and Claims Adjustment Expense [Line Items]
Incurred Impact of ADC	0	0	0	0	0	0
Prior Year Development Net of External Reinsurance After ADC Cessions(a)	0
U.S. Workers' Compensation (before discount) | 2018
Liability for Claims and Claims Adjustment Expense [Line Items]
Incurred losses and allocated loss adjustment expenses, undiscounted and net of reinsurance	896	911	961	1,021	998
2022 Prior Year Development Excluding the Impact of ADC	(15)
Total of IBNR Liabilities Plus Expected Development on Reported Losses	$ 399
Cumulative Number of Reported Claims | country	21,939
Incurred Impact of ADC	$ 0
IBNR Impact of ADC	0
2022 (Net of Impact of ADC)	896	911	961	1,021	998
Total of IBNR Liabilities Net of Impact of ADC	399
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance from the table below	388	359	296	215	85
Prior Year Development Net of External Reinsurance After ADC Cessions(a)	(15)
Paid Impact of ADC	0
U.S. Workers' Compensation (before discount) | 2018 | Adverse Development Reinsurance
Liability for Claims and Claims Adjustment Expense [Line Items]
Incurred Impact of ADC	0	0	0	0	0
Prior Year Development Net of External Reinsurance After ADC Cessions(a)	0
U.S. Workers' Compensation (before discount) | 2019
Liability for Claims and Claims Adjustment Expense [Line Items]
Incurred losses and allocated loss adjustment expenses, undiscounted and net of reinsurance	801	812	873	887
2022 Prior Year Development Excluding the Impact of ADC	(11)
Total of IBNR Liabilities Plus Expected Development on Reported Losses	$ 313
Cumulative Number of Reported Claims | country	16,712
Incurred Impact of ADC	$ 0
IBNR Impact of ADC	0
2022 (Net of Impact of ADC)	801	812	873	887
Total of IBNR Liabilities Net of Impact of ADC	313
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance from the table below	347	301	219	93
Prior Year Development Net of External Reinsurance After ADC Cessions(a)	(11)
Paid Impact of ADC	0
U.S. Workers' Compensation (before discount) | 2019 | Adverse Development Reinsurance
Liability for Claims and Claims Adjustment Expense [Line Items]
Incurred Impact of ADC	0	0	0	0
Prior Year Development Net of External Reinsurance After ADC Cessions(a)	0
U.S. Workers' Compensation (before discount) | 2020
Liability for Claims and Claims Adjustment Expense [Line Items]
Incurred losses and allocated loss adjustment expenses, undiscounted and net of reinsurance	521	573	597
2022 Prior Year Development Excluding the Impact of ADC	(52)
Total of IBNR Liabilities Plus Expected Development on Reported Losses	$ 176
Cumulative Number of Reported Claims | country	13,503
Incurred Impact of ADC	$ 0
IBNR Impact of ADC	0
2022 (Net of Impact of ADC)	521	573	597
Total of IBNR Liabilities Net of Impact of ADC	176
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance from the table below	205	159	64
Prior Year Development Net of External Reinsurance After ADC Cessions(a)	(52)
Paid Impact of ADC	0
U.S. Workers' Compensation (before discount) | 2020 | Adverse Development Reinsurance
Liability for Claims and Claims Adjustment Expense [Line Items]
Incurred Impact of ADC	0	0	0
Prior Year Development Net of External Reinsurance After ADC Cessions(a)	0
U.S. Workers' Compensation (before discount) | 2021
Liability for Claims and Claims Adjustment Expense [Line Items]
Incurred losses and allocated loss adjustment expenses, undiscounted and net of reinsurance	570	597
2022 Prior Year Development Excluding the Impact of ADC	(27)
Total of IBNR Liabilities Plus Expected Development on Reported Losses	$ 314
Cumulative Number of Reported Claims | country	10,480
Incurred Impact of ADC	$ 0
IBNR Impact of ADC	0
2022 (Net of Impact of ADC)	570	597
Total of IBNR Liabilities Net of Impact of ADC	314
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance from the table below	128	60
Prior Year Development Net of External Reinsurance After ADC Cessions(a)	(27)
Paid Impact of ADC	0
U.S. Workers' Compensation (before discount) | 2021 | Adverse Development Reinsurance
Liability for Claims and Claims Adjustment Expense [Line Items]
Incurred Impact of ADC	0	0
Prior Year Development Net of External Reinsurance After ADC Cessions(a)	0
U.S. Workers' Compensation (before discount) | 2022
Liability for Claims and Claims Adjustment Expense [Line Items]
Incurred losses and allocated loss adjustment expenses, undiscounted and net of reinsurance	523
2022 Prior Year Development Excluding the Impact of ADC
Total of IBNR Liabilities Plus Expected Development on Reported Losses	$ 391
Cumulative Number of Reported Claims | country	7,213
Incurred Impact of ADC	$ 0
IBNR Impact of ADC	0
2022 (Net of Impact of ADC)	523
Total of IBNR Liabilities Net of Impact of ADC	391
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance from the table below	45
Prior Year Development Net of External Reinsurance After ADC Cessions(a)
Paid Impact of ADC	0
U.S. Workers' Compensation (before discount) | 2022 | Adverse Development Reinsurance
Liability for Claims and Claims Adjustment Expense [Line Items]
Incurred Impact of ADC	0
Prior Year Development Net of External Reinsurance After ADC Cessions(a)	0
U.S. Workers' Compensation (before discount) | Short Duration Insurance Contracts Last Ten Accident Years
Liability for Claims and Claims Adjustment Expense [Line Items]
2022 Prior Year Development Excluding the Impact of ADC	(207)
Incurred Impact of ADC	(1,217)
2022 (Net of Impact of ADC)	8,946	8,415	8,132	7,745	7,274	6,218	5,389
Prior Year Development Net of External Reinsurance After ADC Cessions(a)	8
U.S. Workers' Compensation (before discount) | Short Duration Insurance Contracts Last Ten Accident Years | Adverse Development Reinsurance
Liability for Claims and Claims Adjustment Expense [Line Items]
Incurred Impact of ADC	(1,217)	(1,432)	(1,392)	(1,426)	(1,474)	(1,677)	(1,700)
Prior Year Development Net of External Reinsurance After ADC Cessions(a)	215
U.S. Workers' Compensation (before discount) | Shortduration Insurance Contracts Accident Years Prior To Current Year
Liability for Claims and Claims Adjustment Expense [Line Items]
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance from the table below	0
U.S. Workers' Compensation (before discount) | Incurred Impact Of Adverse Development Cover
Liability for Claims and Claims Adjustment Expense [Line Items]
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance from the table below	170
Liabilities for losses and loss adjustment expenses and prior year development before accident year 2013, net of reinsurance	(3,639)
U.S. Workers' Compensation (before discount) | Short Duration Insurance Contracts Accident Years Prior To2012
Liability for Claims and Claims Adjustment Expense [Line Items]
Liabilities for losses and loss adjustment expenses and prior year development before accident year 2013, net of reinsurance	(404)
Prior Year Development Net of External Reinsurance After ADC Cessions(a)	(325)
U.S. Workers' Compensation (before discount) | Short Duration Insurance Contracts Accident Years Prior To2012 | Adverse Development Reinsurance
Liability for Claims and Claims Adjustment Expense [Line Items]
Prior Year Development Net of External Reinsurance After ADC Cessions(a)	79
U.S. Workers' Compensation (before discount) | Net Of Impact Of Adverse Development Reinsurance Cover
Liability for Claims and Claims Adjustment Expense [Line Items]
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance from the table below	5,735
Liabilities for losses and loss adjustment expenses and prior year development before accident year 2013, net of reinsurance	751
Unallocated loss adjustment expense prior year development	(21)
Liabilities for losses and loss adjustment expenses and prior year loss development, net of reinsurance	3,962
U.S. Workers' Compensation (before discount) | Unallocated To Accident Year
Liability for Claims and Claims Adjustment Expense [Line Items]
Unallocated loss adjustment expense prior year development	(33)
U.S. Excess Casualty
Liability for Claims and Claims Adjustment Expense [Line Items]
Incurred losses and allocated loss adjustment expenses, undiscounted and net of reinsurance	9,018
2022 Prior Year Development Excluding the Impact of ADC	(116)
Incurred Impact of ADC	(2,531)
2022 (Net of Impact of ADC)	7,792
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance from the table below	5,054
Liabilities for losses and loss adjustment expenses and prior year development before accident year 2013, net of reinsurance	2,205
Liabilities for losses and loss adjustment expenses and prior year loss development, net of reinsurance	6,169
Prior Year Development Net of External Reinsurance After ADC Cessions(a)	17
Paid Impact of ADC	$ (228)
Year 1 (as a percent)	1.30%
Year 2 (as a percent)	7.90%
Year 3 (as a percent)	9.30%
Year 4 (as a percent)	16.90%
Year 5 (as a percent)	11.40%
Year 6 (as a percent)	7.90%
Year 7 (as a percent)	7.50%
Year 8 (as a percent)	4.90%
Year 9 (as a percent)	2.40%
Year 10 (as a percent)	1.00%
U.S. Excess Casualty | Adverse Development Reinsurance
Liability for Claims and Claims Adjustment Expense [Line Items]
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance from the table below	$ 228
Liabilities for losses and loss adjustment expenses and prior year development before accident year 2013, net of reinsurance	(1,533)
Unallocated loss adjustment expense prior year development	28
Prior Year Development Net of External Reinsurance After ADC Cessions(a)	133
U.S. Excess Casualty | 2013
Liability for Claims and Claims Adjustment Expense [Line Items]
Incurred losses and allocated loss adjustment expenses, undiscounted and net of reinsurance	1,237	1,303	1,316	1,292	1,282	1,241	1,308	1,169	1,035	1,123
2022 Prior Year Development Excluding the Impact of ADC	(66)
Total of IBNR Liabilities Plus Expected Development on Reported Losses	$ 194
Cumulative Number of Reported Claims | country	3,423
Incurred Impact of ADC	$ (324)
IBNR Impact of ADC	(175)
2022 (Net of Impact of ADC)	913	970	970	1,032	981	932	935
Total of IBNR Liabilities Net of Impact of ADC	19
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance from the table below	916	903	882	819	705	578	387	207	105	15
Prior Year Development Net of External Reinsurance After ADC Cessions(a)	(57)
Paid Impact of ADC	(33)
U.S. Excess Casualty | 2013 | Adverse Development Reinsurance
Liability for Claims and Claims Adjustment Expense [Line Items]
Incurred Impact of ADC	(324)	(333)	(346)	(260)	(301)	(309)	(373)
Prior Year Development Net of External Reinsurance After ADC Cessions(a)	9
U.S. Excess Casualty | 2014
Liability for Claims and Claims Adjustment Expense [Line Items]
Incurred losses and allocated loss adjustment expenses, undiscounted and net of reinsurance	1,259	1,269	1,248	1,283	1,339	1,260	1,275	1,069	938
2022 Prior Year Development Excluding the Impact of ADC	(10)
Total of IBNR Liabilities Plus Expected Development on Reported Losses	$ 324
Cumulative Number of Reported Claims | country	2,924
Incurred Impact of ADC	$ (390)
IBNR Impact of ADC	(200)
2022 (Net of Impact of ADC)	869	949	912	844	915	905	902
Total of IBNR Liabilities Net of Impact of ADC	124
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance from the table below	878	839	815	703	590	444	240	77	3
Prior Year Development Net of External Reinsurance After ADC Cessions(a)	(80)
Paid Impact of ADC	(54)
U.S. Excess Casualty | 2014 | Adverse Development Reinsurance
Liability for Claims and Claims Adjustment Expense [Line Items]
Incurred Impact of ADC	(390)	(320)	(336)	(439)	(424)	(355)	(373)
Prior Year Development Net of External Reinsurance After ADC Cessions(a)	(70)
U.S. Excess Casualty | 2015
Liability for Claims and Claims Adjustment Expense [Line Items]
Incurred losses and allocated loss adjustment expenses, undiscounted and net of reinsurance	1,686	1,721	1,694	1,656	1,603	1,440	1,463	989
2022 Prior Year Development Excluding the Impact of ADC	(35)
Total of IBNR Liabilities Plus Expected Development on Reported Losses	$ 281
Cumulative Number of Reported Claims | country	3,053
Incurred Impact of ADC	$ (512)
IBNR Impact of ADC	(219)
2022 (Net of Impact of ADC)	1,174	1,231	1,211	1,163	1,139	1,015	1,027
Total of IBNR Liabilities Net of Impact of ADC	62
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance from the table below	1,253	1,124	1,061	935	718	391	210	9
Prior Year Development Net of External Reinsurance After ADC Cessions(a)	(57)
Paid Impact of ADC	(141)
U.S. Excess Casualty | 2015 | Adverse Development Reinsurance
Liability for Claims and Claims Adjustment Expense [Line Items]
Incurred Impact of ADC	(512)	(490)	(483)	(493)	(464)	(425)	(436)
Prior Year Development Net of External Reinsurance After ADC Cessions(a)	(22)
U.S. Excess Casualty | 2016
Liability for Claims and Claims Adjustment Expense [Line Items]
Incurred losses and allocated loss adjustment expenses, undiscounted and net of reinsurance	1,263	1,250	1,274	1,171	1,162	1,146	898
2022 Prior Year Development Excluding the Impact of ADC	13
Total of IBNR Liabilities Plus Expected Development on Reported Losses	$ 362
Cumulative Number of Reported Claims | country	2,628
Incurred Impact of ADC	$ 0
IBNR Impact of ADC	0
2022 (Net of Impact of ADC)	1,263	1,250	1,274	1,171	1,162	1,146	898
Total of IBNR Liabilities Net of Impact of ADC	362
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance from the table below	670	566	502	388	204	80	28
Prior Year Development Net of External Reinsurance After ADC Cessions(a)	13
Paid Impact of ADC	0
U.S. Excess Casualty | 2016 | Adverse Development Reinsurance
Liability for Claims and Claims Adjustment Expense [Line Items]
Incurred Impact of ADC	0	0	0	0	0	0	0
Prior Year Development Net of External Reinsurance After ADC Cessions(a)	0
U.S. Excess Casualty | 2017
Liability for Claims and Claims Adjustment Expense [Line Items]
Incurred losses and allocated loss adjustment expenses, undiscounted and net of reinsurance	1,200	1,157	1,153	1,097	1,002	856
2022 Prior Year Development Excluding the Impact of ADC	43
Total of IBNR Liabilities Plus Expected Development on Reported Losses	$ 354
Cumulative Number of Reported Claims | country	1,985
Incurred Impact of ADC	$ 0
IBNR Impact of ADC	0
2022 (Net of Impact of ADC)	1,200	1,157	1,153	1,097	1,002	856
Total of IBNR Liabilities Net of Impact of ADC	354
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance from the table below	676	585	505	156	45	1
Prior Year Development Net of External Reinsurance After ADC Cessions(a)	43
Paid Impact of ADC	0
U.S. Excess Casualty | 2017 | Adverse Development Reinsurance
Liability for Claims and Claims Adjustment Expense [Line Items]
Incurred Impact of ADC	0	0	0	0	0	0
Prior Year Development Net of External Reinsurance After ADC Cessions(a)	0
U.S. Excess Casualty | 2018
Liability for Claims and Claims Adjustment Expense [Line Items]
Incurred losses and allocated loss adjustment expenses, undiscounted and net of reinsurance	769	769	721	646	648
2022 Prior Year Development Excluding the Impact of ADC	0
Total of IBNR Liabilities Plus Expected Development on Reported Losses	$ 189
Cumulative Number of Reported Claims | country	1,350
Incurred Impact of ADC	$ 0
IBNR Impact of ADC	0
2022 (Net of Impact of ADC)	769	769	721	646	648
Total of IBNR Liabilities Net of Impact of ADC	189
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance from the table below	414	315	227	125	1
Prior Year Development Net of External Reinsurance After ADC Cessions(a)	0
Paid Impact of ADC	0
U.S. Excess Casualty | 2018 | Adverse Development Reinsurance
Liability for Claims and Claims Adjustment Expense [Line Items]
Incurred Impact of ADC	0	0	0	0	0
Prior Year Development Net of External Reinsurance After ADC Cessions(a)	0
U.S. Excess Casualty | 2019
Liability for Claims and Claims Adjustment Expense [Line Items]
Incurred losses and allocated loss adjustment expenses, undiscounted and net of reinsurance	612	597	583	577
2022 Prior Year Development Excluding the Impact of ADC	15
Total of IBNR Liabilities Plus Expected Development on Reported Losses	$ 357
Cumulative Number of Reported Claims | country	1,162
Incurred Impact of ADC	$ 0
IBNR Impact of ADC	0
2022 (Net of Impact of ADC)	612	597	583	577
Total of IBNR Liabilities Net of Impact of ADC	357
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance from the table below	157	79	43	7
Prior Year Development Net of External Reinsurance After ADC Cessions(a)	15
Paid Impact of ADC	0
U.S. Excess Casualty | 2019 | Adverse Development Reinsurance
Liability for Claims and Claims Adjustment Expense [Line Items]
Incurred Impact of ADC	0	0	0	0
Prior Year Development Net of External Reinsurance After ADC Cessions(a)	0
U.S. Excess Casualty | 2020
Liability for Claims and Claims Adjustment Expense [Line Items]
Incurred losses and allocated loss adjustment expenses, undiscounted and net of reinsurance	410	413	406
2022 Prior Year Development Excluding the Impact of ADC	(3)
Total of IBNR Liabilities Plus Expected Development on Reported Losses	$ 324
Cumulative Number of Reported Claims | country	1,064
Incurred Impact of ADC	$ 0
IBNR Impact of ADC	0
2022 (Net of Impact of ADC)	410	413	406
Total of IBNR Liabilities Net of Impact of ADC	324
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance from the table below	33	15	4
Prior Year Development Net of External Reinsurance After ADC Cessions(a)	(3)
Paid Impact of ADC	0
U.S. Excess Casualty | 2020 | Adverse Development Reinsurance
Liability for Claims and Claims Adjustment Expense [Line Items]
Incurred Impact of ADC	0	0	0
Prior Year Development Net of External Reinsurance After ADC Cessions(a)	0
U.S. Excess Casualty | 2021
Liability for Claims and Claims Adjustment Expense [Line Items]
Incurred losses and allocated loss adjustment expenses, undiscounted and net of reinsurance	277	278
2022 Prior Year Development Excluding the Impact of ADC	(1)
Total of IBNR Liabilities Plus Expected Development on Reported Losses	$ 150
Cumulative Number of Reported Claims | country	652
Incurred Impact of ADC	$ 0
IBNR Impact of ADC	0
2022 (Net of Impact of ADC)	277	278
Total of IBNR Liabilities Net of Impact of ADC	150
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance from the table below	43	4
Prior Year Development Net of External Reinsurance After ADC Cessions(a)	(1)
Paid Impact of ADC	0
U.S. Excess Casualty | 2021 | Adverse Development Reinsurance
Liability for Claims and Claims Adjustment Expense [Line Items]
Incurred Impact of ADC	0	0
Prior Year Development Net of External Reinsurance After ADC Cessions(a)	0
U.S. Excess Casualty | 2022
Liability for Claims and Claims Adjustment Expense [Line Items]
Incurred losses and allocated loss adjustment expenses, undiscounted and net of reinsurance	305
2022 Prior Year Development Excluding the Impact of ADC
Total of IBNR Liabilities Plus Expected Development on Reported Losses	$ 280
Cumulative Number of Reported Claims | country	254
Incurred Impact of ADC	$ 0
IBNR Impact of ADC	0
2022 (Net of Impact of ADC)	305
Total of IBNR Liabilities Net of Impact of ADC	280
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance from the table below	14
Prior Year Development Net of External Reinsurance After ADC Cessions(a)
Paid Impact of ADC	0
U.S. Excess Casualty | 2022 | Adverse Development Reinsurance
Liability for Claims and Claims Adjustment Expense [Line Items]
Incurred Impact of ADC	0
Prior Year Development Net of External Reinsurance After ADC Cessions(a)	0
U.S. Excess Casualty | Short Duration Insurance Contracts Last Ten Accident Years
Liability for Claims and Claims Adjustment Expense [Line Items]
2022 Prior Year Development Excluding the Impact of ADC	(44)
Incurred Impact of ADC	(1,226)
2022 (Net of Impact of ADC)	7,792	7,614	7,230	6,530	5,847	4,854	3,762
Prior Year Development Net of External Reinsurance After ADC Cessions(a)	(127)
U.S. Excess Casualty | Short Duration Insurance Contracts Last Ten Accident Years | Adverse Development Reinsurance
Liability for Claims and Claims Adjustment Expense [Line Items]
Incurred Impact of ADC	(1,226)	(1,143)	(1,165)	(1,192)	(1,189)	(1,089)	(1,182)
Prior Year Development Net of External Reinsurance After ADC Cessions(a)	(83)
U.S. Excess Casualty | Shortduration Insurance Contracts Accident Years Prior To Current Year
Liability for Claims and Claims Adjustment Expense [Line Items]
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance from the table below	0
U.S. Excess Casualty | Incurred Impact Of Adverse Development Cover
Liability for Claims and Claims Adjustment Expense [Line Items]
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance from the table below	228
Liabilities for losses and loss adjustment expenses and prior year development before accident year 2013, net of reinsurance	(1,533)
U.S. Excess Casualty | Short Duration Insurance Contracts Accident Years Prior To2012
Liability for Claims and Claims Adjustment Expense [Line Items]
Liabilities for losses and loss adjustment expenses and prior year development before accident year 2013, net of reinsurance	(121)
Prior Year Development Net of External Reinsurance After ADC Cessions(a)	67
U.S. Excess Casualty | Short Duration Insurance Contracts Accident Years Prior To2012 | Adverse Development Reinsurance
Liability for Claims and Claims Adjustment Expense [Line Items]
Prior Year Development Net of External Reinsurance After ADC Cessions(a)	188
U.S. Excess Casualty | Net Of Impact Of Adverse Development Reinsurance Cover
Liability for Claims and Claims Adjustment Expense [Line Items]
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance from the table below	(4,826)
Liabilities for losses and loss adjustment expenses and prior year development before accident year 2013, net of reinsurance	672
Unallocated loss adjustment expense prior year development	77
Liabilities for losses and loss adjustment expenses and prior year loss development, net of reinsurance	3,638
U.S. Excess Casualty | Unallocated To Accident Year
Liability for Claims and Claims Adjustment Expense [Line Items]
Unallocated loss adjustment expense prior year development	49
U.S. Other Casualty
Liability for Claims and Claims Adjustment Expense [Line Items]
Incurred losses and allocated loss adjustment expenses, undiscounted and net of reinsurance	11,863
2022 Prior Year Development Excluding the Impact of ADC	(149)
Incurred Impact of ADC	(1,472)
2022 (Net of Impact of ADC)	11,154
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance from the table below	8,018
Liabilities for losses and loss adjustment expenses and prior year development before accident year 2013, net of reinsurance	1,485
Liabilities for losses and loss adjustment expenses and prior year loss development, net of reinsurance	5,330
Prior Year Development Net of External Reinsurance After ADC Cessions(a)	(162)
Paid Impact of ADC	$ (277)
Year 1 (as a percent)	6.20%
Year 2 (as a percent)	12.40%
Year 3 (as a percent)	14.90%
Year 4 (as a percent)	14.60%
Year 5 (as a percent)	14.00%
Year 6 (as a percent)	8.90%
Year 7 (as a percent)	5.60%
Year 8 (as a percent)	3.70%
Year 9 (as a percent)	2.30%
Year 10 (as a percent)	2.00%
U.S. Other Casualty | Adverse Development Reinsurance
Liability for Claims and Claims Adjustment Expense [Line Items]
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance from the table below	$ 277
Liabilities for losses and loss adjustment expenses and prior year development before accident year 2013, net of reinsurance	(1,040)
Unallocated loss adjustment expense prior year development	9
Prior Year Development Net of External Reinsurance After ADC Cessions(a)	(13)
U.S. Other Casualty | 2013
Liability for Claims and Claims Adjustment Expense [Line Items]
Incurred losses and allocated loss adjustment expenses, undiscounted and net of reinsurance	2,158	2,178	2,196	2,211	2,164	2,185	2,148	1,912	1,729	1,653
2022 Prior Year Development Excluding the Impact of ADC	(20)
Total of IBNR Liabilities Plus Expected Development on Reported Losses	$ 144
Cumulative Number of Reported Claims | country	40,358
Incurred Impact of ADC	$ (231)
IBNR Impact of ADC	(128)
2022 (Net of Impact of ADC)	1,927	1,926	1,920	1,948	1,929	1,960	1,948
Total of IBNR Liabilities Net of Impact of ADC	16
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance from the table below	1,943	1,900	1,885	1,809	1,688	1,485	1,248	962	594	169
Prior Year Development Net of External Reinsurance After ADC Cessions(a)	1
Paid Impact of ADC	(42)
U.S. Other Casualty | 2013 | Adverse Development Reinsurance
Liability for Claims and Claims Adjustment Expense [Line Items]
Incurred Impact of ADC	(231)	(252)	(276)	(263)	(235)	(225)	(200)
Prior Year Development Net of External Reinsurance After ADC Cessions(a)	21
U.S. Other Casualty | 2014
Liability for Claims and Claims Adjustment Expense [Line Items]
Incurred losses and allocated loss adjustment expenses, undiscounted and net of reinsurance	1,944	1,935	1,946	1,916	1,910	2,009	1,963	1,721	1,751
2022 Prior Year Development Excluding the Impact of ADC	9
Total of IBNR Liabilities Plus Expected Development on Reported Losses	$ 87
Cumulative Number of Reported Claims | country	38,469
Incurred Impact of ADC	$ (226)
IBNR Impact of ADC	(65)
2022 (Net of Impact of ADC)	1,718	1,722	1,701	1,694	1,634	1,678	1,667
Total of IBNR Liabilities Net of Impact of ADC	22
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance from the table below	1,795	1,719	1,653	1,572	1,392	1,150	868	620	210
Prior Year Development Net of External Reinsurance After ADC Cessions(a)	(4)
Paid Impact of ADC	(97)
U.S. Other Casualty | 2014 | Adverse Development Reinsurance
Liability for Claims and Claims Adjustment Expense [Line Items]
Incurred Impact of ADC	(226)	(213)	(245)	(222)	(276)	(331)	(296)
Prior Year Development Net of External Reinsurance After ADC Cessions(a)	(13)
U.S. Other Casualty | 2015
Liability for Claims and Claims Adjustment Expense [Line Items]
Incurred losses and allocated loss adjustment expenses, undiscounted and net of reinsurance	1,815	1,824	1,834	1,794	1,736	1,829	1,762	1,329
2022 Prior Year Development Excluding the Impact of ADC	(9)
Total of IBNR Liabilities Plus Expected Development on Reported Losses	$ 25
Cumulative Number of Reported Claims | country	35,664
Incurred Impact of ADC	$ (252)
IBNR Impact of ADC	(17)
2022 (Net of Impact of ADC)	1,563	1,562	1,553	1,493	1,423	1,373	1,361
Total of IBNR Liabilities Net of Impact of ADC	8
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance from the table below	1,680	1,603	1,485	1,351	1,087	769	309	105
Prior Year Development Net of External Reinsurance After ADC Cessions(a)	1
Paid Impact of ADC	(138)
U.S. Other Casualty | 2015 | Adverse Development Reinsurance
Liability for Claims and Claims Adjustment Expense [Line Items]
Incurred Impact of ADC	(252)	(262)	(281)	(301)	(313)	(456)	(401)
Prior Year Development Net of External Reinsurance After ADC Cessions(a)	10
U.S. Other Casualty | 2016
Liability for Claims and Claims Adjustment Expense [Line Items]
Incurred losses and allocated loss adjustment expenses, undiscounted and net of reinsurance	1,293	1,323	1,340	1,391	1,321	1,343	1,339
2022 Prior Year Development Excluding the Impact of ADC	(30)
Total of IBNR Liabilities Plus Expected Development on Reported Losses	$ 165
Cumulative Number of Reported Claims | country	29,099
Incurred Impact of ADC	$ 0
IBNR Impact of ADC	0
2022 (Net of Impact of ADC)	1,293	1,323	1,340	1,391	1,321	1,343	1,339
Total of IBNR Liabilities Net of Impact of ADC	165
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance from the table below	1,018	938	846	703	489	298	77
Prior Year Development Net of External Reinsurance After ADC Cessions(a)	(30)
Paid Impact of ADC	0
U.S. Other Casualty | 2016 | Adverse Development Reinsurance
Liability for Claims and Claims Adjustment Expense [Line Items]
Incurred Impact of ADC	0	0	0	0	0	0	0
Prior Year Development Net of External Reinsurance After ADC Cessions(a)	0
U.S. Other Casualty | 2017
Liability for Claims and Claims Adjustment Expense [Line Items]
Incurred losses and allocated loss adjustment expenses, undiscounted and net of reinsurance	643	668	674	738	629	602
2022 Prior Year Development Excluding the Impact of ADC	(25)
Total of IBNR Liabilities Plus Expected Development on Reported Losses	$ 51
Cumulative Number of Reported Claims | country	21,090
Incurred Impact of ADC	$ 0
IBNR Impact of ADC	0
2022 (Net of Impact of ADC)	643	668	674	738	629	602
Total of IBNR Liabilities Net of Impact of ADC	51
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance from the table below	527	455	314	216	111	51
Prior Year Development Net of External Reinsurance After ADC Cessions(a)	(25)
Paid Impact of ADC	0
U.S. Other Casualty | 2017 | Adverse Development Reinsurance
Liability for Claims and Claims Adjustment Expense [Line Items]
Incurred Impact of ADC	0	0	0	0	0	0
Prior Year Development Net of External Reinsurance After ADC Cessions(a)	0
U.S. Other Casualty | 2018
Liability for Claims and Claims Adjustment Expense [Line Items]
Incurred losses and allocated loss adjustment expenses, undiscounted and net of reinsurance	824	870	837	845	802
2022 Prior Year Development Excluding the Impact of ADC	(46)
Total of IBNR Liabilities Plus Expected Development on Reported Losses	$ 235
Cumulative Number of Reported Claims | country	16,736
Incurred Impact of ADC	$ 0
IBNR Impact of ADC	0
2022 (Net of Impact of ADC)	824	870	837	845	802
Total of IBNR Liabilities Net of Impact of ADC	235
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance from the table below	470	360	227	122	43
Prior Year Development Net of External Reinsurance After ADC Cessions(a)	(46)
Paid Impact of ADC	0
U.S. Other Casualty | 2018 | Adverse Development Reinsurance
Liability for Claims and Claims Adjustment Expense [Line Items]
Incurred Impact of ADC	0	0	0	0	0
Prior Year Development Net of External Reinsurance After ADC Cessions(a)	0
U.S. Other Casualty | 2019
Liability for Claims and Claims Adjustment Expense [Line Items]
Incurred losses and allocated loss adjustment expenses, undiscounted and net of reinsurance	1,062	1,053	1,058	1,059
2022 Prior Year Development Excluding the Impact of ADC	9
Total of IBNR Liabilities Plus Expected Development on Reported Losses	$ 615
Cumulative Number of Reported Claims | country	20,690
Incurred Impact of ADC	$ 0
IBNR Impact of ADC	0
2022 (Net of Impact of ADC)	1,062	1,053	1,058	1,059
Total of IBNR Liabilities Net of Impact of ADC	615
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance from the table below	321	226	138	53
Prior Year Development Net of External Reinsurance After ADC Cessions(a)	9
Paid Impact of ADC	0
U.S. Other Casualty | 2019 | Adverse Development Reinsurance
Liability for Claims and Claims Adjustment Expense [Line Items]
Incurred Impact of ADC	0	0	0	0
Prior Year Development Net of External Reinsurance After ADC Cessions(a)	0
U.S. Other Casualty | 2020
Liability for Claims and Claims Adjustment Expense [Line Items]
Incurred losses and allocated loss adjustment expenses, undiscounted and net of reinsurance	538	576	524
2022 Prior Year Development Excluding the Impact of ADC	(38)
Total of IBNR Liabilities Plus Expected Development on Reported Losses	$ 329
Cumulative Number of Reported Claims | country	10,808
Incurred Impact of ADC	$ 0
IBNR Impact of ADC	0
2022 (Net of Impact of ADC)	538	576	524
Total of IBNR Liabilities Net of Impact of ADC	329
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance from the table below	139	73	26
Prior Year Development Net of External Reinsurance After ADC Cessions(a)	(38)
Paid Impact of ADC	0
U.S. Other Casualty | 2020 | Adverse Development Reinsurance
Liability for Claims and Claims Adjustment Expense [Line Items]
Incurred Impact of ADC	0	0	0
Prior Year Development Net of External Reinsurance After ADC Cessions(a)	0
U.S. Other Casualty | 2021
Liability for Claims and Claims Adjustment Expense [Line Items]
Incurred losses and allocated loss adjustment expenses, undiscounted and net of reinsurance	793	795
2022 Prior Year Development Excluding the Impact of ADC	(2)
Total of IBNR Liabilities Plus Expected Development on Reported Losses	$ 615
Cumulative Number of Reported Claims | country	9,560
Incurred Impact of ADC	$ 0
IBNR Impact of ADC	0
2022 (Net of Impact of ADC)	793	795
Total of IBNR Liabilities Net of Impact of ADC	615
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance from the table below	87	32
Prior Year Development Net of External Reinsurance After ADC Cessions(a)	(2)
Paid Impact of ADC	0
U.S. Other Casualty | 2021 | Adverse Development Reinsurance
Liability for Claims and Claims Adjustment Expense [Line Items]
Incurred Impact of ADC	0	0
Prior Year Development Net of External Reinsurance After ADC Cessions(a)	0
U.S. Other Casualty | 2022
Liability for Claims and Claims Adjustment Expense [Line Items]
Incurred losses and allocated loss adjustment expenses, undiscounted and net of reinsurance	793
2022 Prior Year Development Excluding the Impact of ADC
Total of IBNR Liabilities Plus Expected Development on Reported Losses	$ 708
Cumulative Number of Reported Claims | country	9,650
Incurred Impact of ADC	$ 0
IBNR Impact of ADC	0
2022 (Net of Impact of ADC)	793
Total of IBNR Liabilities Net of Impact of ADC	708
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance from the table below	38
Prior Year Development Net of External Reinsurance After ADC Cessions(a)
Paid Impact of ADC	0
U.S. Other Casualty | 2022 | Adverse Development Reinsurance
Liability for Claims and Claims Adjustment Expense [Line Items]
Incurred Impact of ADC	0
Prior Year Development Net of External Reinsurance After ADC Cessions(a)	0
U.S. Other Casualty | Short Duration Insurance Contracts Last Ten Accident Years
Liability for Claims and Claims Adjustment Expense [Line Items]
2022 Prior Year Development Excluding the Impact of ADC	(152)
Incurred Impact of ADC	(709)
2022 (Net of Impact of ADC)	11,154	10,495	9,607	9,168	7,738	6,956	6,315
Prior Year Development Net of External Reinsurance After ADC Cessions(a)	(134)
U.S. Other Casualty | Short Duration Insurance Contracts Last Ten Accident Years | Adverse Development Reinsurance
Liability for Claims and Claims Adjustment Expense [Line Items]
Incurred Impact of ADC	(709)	(727)	(802)	(786)	(824)	(1,012)	(897)
Prior Year Development Net of External Reinsurance After ADC Cessions(a)	18
U.S. Other Casualty | Shortduration Insurance Contracts Accident Years Prior To Current Year
Liability for Claims and Claims Adjustment Expense [Line Items]
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance from the table below	0
U.S. Other Casualty | Incurred Impact Of Adverse Development Cover
Liability for Claims and Claims Adjustment Expense [Line Items]
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance from the table below	277
Liabilities for losses and loss adjustment expenses and prior year development before accident year 2013, net of reinsurance	(1,040)
U.S. Other Casualty | Short Duration Insurance Contracts Accident Years Prior To2012
Liability for Claims and Claims Adjustment Expense [Line Items]
Liabilities for losses and loss adjustment expenses and prior year development before accident year 2013, net of reinsurance	0
Prior Year Development Net of External Reinsurance After ADC Cessions(a)	(40)
U.S. Other Casualty | Short Duration Insurance Contracts Accident Years Prior To2012 | Adverse Development Reinsurance
Liability for Claims and Claims Adjustment Expense [Line Items]
Prior Year Development Net of External Reinsurance After ADC Cessions(a)	(40)
U.S. Other Casualty | Net Of Impact Of Adverse Development Reinsurance Cover
Liability for Claims and Claims Adjustment Expense [Line Items]
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance from the table below	(7,741)
Liabilities for losses and loss adjustment expenses and prior year development before accident year 2013, net of reinsurance	445
Unallocated loss adjustment expense prior year development	12
Liabilities for losses and loss adjustment expenses and prior year loss development, net of reinsurance	3,858
U.S. Other Casualty | Unallocated To Accident Year
Liability for Claims and Claims Adjustment Expense [Line Items]
Unallocated loss adjustment expense prior year development	3
U.S. Financial Lines
Liability for Claims and Claims Adjustment Expense [Line Items]
Incurred losses and allocated loss adjustment expenses, undiscounted and net of reinsurance	18,056
2022 Prior Year Development Excluding the Impact of ADC	939
Incurred Impact of ADC	(699)
2022 (Net of Impact of ADC)	17,161
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance from the table below	11,719
Liabilities for losses and loss adjustment expenses and prior year development before accident year 2013, net of reinsurance	261
Liabilities for losses and loss adjustment expenses and prior year loss development, net of reinsurance	6,598
Prior Year Development Net of External Reinsurance After ADC Cessions(a)	707
Paid Impact of ADC	$ (478)
Year 1 (as a percent)	3.60%
Year 2 (as a percent)	15.90%
Year 3 (as a percent)	19.60%
Year 4 (as a percent)	15.30%
Year 5 (as a percent)	12.40%
Year 6 (as a percent)	7.70%
Year 7 (as a percent)	5.60%
Year 8 (as a percent)	4.80%
Year 9 (as a percent)	4.00%
Year 10 (as a percent)	1.60%
U.S. Financial Lines | Adverse Development Reinsurance
Liability for Claims and Claims Adjustment Expense [Line Items]
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance from the table below	$ 478
Liabilities for losses and loss adjustment expenses and prior year development before accident year 2013, net of reinsurance	(282)
Unallocated loss adjustment expense prior year development	14
Prior Year Development Net of External Reinsurance After ADC Cessions(a)	(232)
U.S. Financial Lines | 2013
Liability for Claims and Claims Adjustment Expense [Line Items]
Incurred losses and allocated loss adjustment expenses, undiscounted and net of reinsurance	1,589	1,542	1,550	1,509	1,497	1,555	1,613	1,670	1,719	1,790
2022 Prior Year Development Excluding the Impact of ADC	47
Total of IBNR Liabilities Plus Expected Development on Reported Losses	$ 52
Cumulative Number of Reported Claims | country	19,157
Incurred Impact of ADC	$ (180)
IBNR Impact of ADC	(49)
2022 (Net of Impact of ADC)	1,409	1,415	1,402	1,409	1,408	1,429	1,442
Total of IBNR Liabilities Net of Impact of ADC	3
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance from the table below	1,466	1,440	1,362	1,314	1,235	1,139	945	682	327	41
Prior Year Development Net of External Reinsurance After ADC Cessions(a)	(6)
Paid Impact of ADC	(81)
U.S. Financial Lines | 2013 | Adverse Development Reinsurance
Liability for Claims and Claims Adjustment Expense [Line Items]
Incurred Impact of ADC	(180)	(127)	(148)	(100)	(89)	(126)	(171)
Prior Year Development Net of External Reinsurance After ADC Cessions(a)	(53)
U.S. Financial Lines | 2014
Liability for Claims and Claims Adjustment Expense [Line Items]
Incurred losses and allocated loss adjustment expenses, undiscounted and net of reinsurance	2,014	2,057	2,000	1,981	1,960	1,927	1,892	1,777	1,812
2022 Prior Year Development Excluding the Impact of ADC	(43)
Total of IBNR Liabilities Plus Expected Development on Reported Losses	$ 110
Cumulative Number of Reported Claims | country	17,638
Incurred Impact of ADC	$ (276)
IBNR Impact of ADC	(82)
2022 (Net of Impact of ADC)	1,738	1,761	1,759	1,741	1,753	1,729	1,733
Total of IBNR Liabilities Net of Impact of ADC	28
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance from the table below	1,820	1,758	1,658	1,573	1,387	1,158	849	366	66
Prior Year Development Net of External Reinsurance After ADC Cessions(a)	(23)
Paid Impact of ADC	(128)
U.S. Financial Lines | 2014 | Adverse Development Reinsurance
Liability for Claims and Claims Adjustment Expense [Line Items]
Incurred Impact of ADC	(276)	(296)	(241)	(240)	(207)	(198)	(159)
Prior Year Development Net of External Reinsurance After ADC Cessions(a)	20
U.S. Financial Lines | 2015
Liability for Claims and Claims Adjustment Expense [Line Items]
Incurred losses and allocated loss adjustment expenses, undiscounted and net of reinsurance	2,044	1,959	1,874	1,830	1,788	1,743	1,762	1,737
2022 Prior Year Development Excluding the Impact of ADC	85
Total of IBNR Liabilities Plus Expected Development on Reported Losses	$ 99
Cumulative Number of Reported Claims | country	16,235
Incurred Impact of ADC	$ (439)
IBNR Impact of ADC	(78)
2022 (Net of Impact of ADC)	1,605	1,595	1,550	1,552	1,462	1,430	1,429
Total of IBNR Liabilities Net of Impact of ADC	21
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance from the table below	1,818	1,686	1,488	1,282	1,055	791	390	63
Prior Year Development Net of External Reinsurance After ADC Cessions(a)	10
Paid Impact of ADC	(269)
U.S. Financial Lines | 2015 | Adverse Development Reinsurance
Liability for Claims and Claims Adjustment Expense [Line Items]
Incurred Impact of ADC	(439)	(364)	(324)	(278)	(326)	(313)	(333)
Prior Year Development Net of External Reinsurance After ADC Cessions(a)	(75)
U.S. Financial Lines | 2016
Liability for Claims and Claims Adjustment Expense [Line Items]
Incurred losses and allocated loss adjustment expenses, undiscounted and net of reinsurance	2,325	2,281	2,139	2,064	1,993	1,855	1,605
2022 Prior Year Development Excluding the Impact of ADC	44
Total of IBNR Liabilities Plus Expected Development on Reported Losses	$ 246
Cumulative Number of Reported Claims | country	16,135
Incurred Impact of ADC	$ 0
IBNR Impact of ADC	0
2022 (Net of Impact of ADC)	2,325	2,281	2,139	2,064	1,993	1,855	1,605
Total of IBNR Liabilities Net of Impact of ADC	246
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance from the table below	1,903	1,826	1,659	1,358	1,002	499	73
Prior Year Development Net of External Reinsurance After ADC Cessions(a)	44
Paid Impact of ADC	0
U.S. Financial Lines | 2016 | Adverse Development Reinsurance
Liability for Claims and Claims Adjustment Expense [Line Items]
Incurred Impact of ADC	0	0	0	0	0	0	0
Prior Year Development Net of External Reinsurance After ADC Cessions(a)	0
U.S. Financial Lines | 2017
Liability for Claims and Claims Adjustment Expense [Line Items]
Incurred losses and allocated loss adjustment expenses, undiscounted and net of reinsurance	1,987	1,898	1,846	1,756	1,675	1,564
2022 Prior Year Development Excluding the Impact of ADC	89
Total of IBNR Liabilities Plus Expected Development on Reported Losses	$ 266
Cumulative Number of Reported Claims | country	15,213
Incurred Impact of ADC	$ 0
IBNR Impact of ADC	0
2022 (Net of Impact of ADC)	1,987	1,898	1,846	1,756	1,675	1,564
Total of IBNR Liabilities Net of Impact of ADC	266
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance from the table below	1,515	1,396	1,118	761	391	64
Prior Year Development Net of External Reinsurance After ADC Cessions(a)	89
Paid Impact of ADC	0
U.S. Financial Lines | 2017 | Adverse Development Reinsurance
Liability for Claims and Claims Adjustment Expense [Line Items]
Incurred Impact of ADC	0	0	0	0	0	0
Prior Year Development Net of External Reinsurance After ADC Cessions(a)	0
U.S. Financial Lines | 2018
Liability for Claims and Claims Adjustment Expense [Line Items]
Incurred losses and allocated loss adjustment expenses, undiscounted and net of reinsurance	2,225	2,063	1,882	1,766	1,640
2022 Prior Year Development Excluding the Impact of ADC	162
Total of IBNR Liabilities Plus Expected Development on Reported Losses	$ 574
Cumulative Number of Reported Claims | country	14,787
Incurred Impact of ADC	$ 0
IBNR Impact of ADC	0
2022 (Net of Impact of ADC)	2,225	2,063	1,882	1,766	1,640
Total of IBNR Liabilities Net of Impact of ADC	574
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance from the table below	1,415	1,126	835	486	86
Prior Year Development Net of External Reinsurance After ADC Cessions(a)	162
Paid Impact of ADC	0
U.S. Financial Lines | 2018 | Adverse Development Reinsurance
Liability for Claims and Claims Adjustment Expense [Line Items]
Incurred Impact of ADC	0	0	0	0	0
Prior Year Development Net of External Reinsurance After ADC Cessions(a)	0
U.S. Financial Lines | 2019
Liability for Claims and Claims Adjustment Expense [Line Items]
Incurred losses and allocated loss adjustment expenses, undiscounted and net of reinsurance	1,926	1,627	1,536	1,503
2022 Prior Year Development Excluding the Impact of ADC	299
Total of IBNR Liabilities Plus Expected Development on Reported Losses	$ 672
Cumulative Number of Reported Claims | country	13,242
Incurred Impact of ADC	$ 0
IBNR Impact of ADC	0
2022 (Net of Impact of ADC)	1,926	1,627	1,536	1,503
Total of IBNR Liabilities Net of Impact of ADC	672
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance from the table below	953	642	367	94
Prior Year Development Net of External Reinsurance After ADC Cessions(a)	299
Paid Impact of ADC	0
U.S. Financial Lines | 2019 | Adverse Development Reinsurance
Liability for Claims and Claims Adjustment Expense [Line Items]
Incurred Impact of ADC	0	0	0	0
Prior Year Development Net of External Reinsurance After ADC Cessions(a)	0
U.S. Financial Lines | 2020
Liability for Claims and Claims Adjustment Expense [Line Items]
Incurred losses and allocated loss adjustment expenses, undiscounted and net of reinsurance	1,408	1,252	1,213
2022 Prior Year Development Excluding the Impact of ADC	156
Total of IBNR Liabilities Plus Expected Development on Reported Losses	$ 525
Cumulative Number of Reported Claims | country	10,251
Incurred Impact of ADC	$ 0
IBNR Impact of ADC	0
2022 (Net of Impact of ADC)	1,408	1,252	1,213
Total of IBNR Liabilities Net of Impact of ADC	525
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance from the table below	648	356	84
Prior Year Development Net of External Reinsurance After ADC Cessions(a)	156
Paid Impact of ADC	0
U.S. Financial Lines | 2020 | Adverse Development Reinsurance
Liability for Claims and Claims Adjustment Expense [Line Items]
Incurred Impact of ADC	0	0	0
Prior Year Development Net of External Reinsurance After ADC Cessions(a)	0
U.S. Financial Lines | 2021
Liability for Claims and Claims Adjustment Expense [Line Items]
Incurred losses and allocated loss adjustment expenses, undiscounted and net of reinsurance	1,408	1,430
2022 Prior Year Development Excluding the Impact of ADC	(22)
Total of IBNR Liabilities Plus Expected Development on Reported Losses	$ 1,144
Cumulative Number of Reported Claims | country	6,934
Incurred Impact of ADC	$ 0
IBNR Impact of ADC	0
2022 (Net of Impact of ADC)	1,408	1,430
Total of IBNR Liabilities Net of Impact of ADC	1,144
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance from the table below	151	43
Prior Year Development Net of External Reinsurance After ADC Cessions(a)	(22)
Paid Impact of ADC	0
U.S. Financial Lines | 2021 | Adverse Development Reinsurance
Liability for Claims and Claims Adjustment Expense [Line Items]
Incurred Impact of ADC	0	0
Prior Year Development Net of External Reinsurance After ADC Cessions(a)	0
U.S. Financial Lines | 2022
Liability for Claims and Claims Adjustment Expense [Line Items]
Incurred losses and allocated loss adjustment expenses, undiscounted and net of reinsurance	1,130
2022 Prior Year Development Excluding the Impact of ADC
Total of IBNR Liabilities Plus Expected Development on Reported Losses	$ 1,076
Cumulative Number of Reported Claims | country	5,192
Incurred Impact of ADC	$ 0
IBNR Impact of ADC	0
2022 (Net of Impact of ADC)	1,130
Total of IBNR Liabilities Net of Impact of ADC	1,076
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance from the table below	30
Prior Year Development Net of External Reinsurance After ADC Cessions(a)
Paid Impact of ADC	0
U.S. Financial Lines | 2022 | Adverse Development Reinsurance
Liability for Claims and Claims Adjustment Expense [Line Items]
Incurred Impact of ADC	0
Prior Year Development Net of External Reinsurance After ADC Cessions(a)	0
U.S. Financial Lines | Short Duration Insurance Contracts Last Ten Accident Years
Liability for Claims and Claims Adjustment Expense [Line Items]
2022 Prior Year Development Excluding the Impact of ADC	817
Incurred Impact of ADC	(895)
2022 (Net of Impact of ADC)	17,161	15,322	13,327	11,791	9,931	8,007	6,209
Prior Year Development Net of External Reinsurance After ADC Cessions(a)	709
U.S. Financial Lines | Short Duration Insurance Contracts Last Ten Accident Years | Adverse Development Reinsurance
Liability for Claims and Claims Adjustment Expense [Line Items]
Incurred Impact of ADC	(895)	(787)	(713)	(618)	(622)	(637)	(663)
Prior Year Development Net of External Reinsurance After ADC Cessions(a)	(108)
U.S. Financial Lines | Shortduration Insurance Contracts Accident Years Prior To Current Year
Liability for Claims and Claims Adjustment Expense [Line Items]
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance from the table below	0
U.S. Financial Lines | Incurred Impact Of Adverse Development Cover
Liability for Claims and Claims Adjustment Expense [Line Items]
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance from the table below	478
Liabilities for losses and loss adjustment expenses and prior year development before accident year 2013, net of reinsurance	(282)
U.S. Financial Lines | Short Duration Insurance Contracts Accident Years Prior To2012
Liability for Claims and Claims Adjustment Expense [Line Items]
Liabilities for losses and loss adjustment expenses and prior year development before accident year 2013, net of reinsurance	134
Prior Year Development Net of External Reinsurance After ADC Cessions(a)	(4)
U.S. Financial Lines | Short Duration Insurance Contracts Accident Years Prior To2012 | Adverse Development Reinsurance
Liability for Claims and Claims Adjustment Expense [Line Items]
Prior Year Development Net of External Reinsurance After ADC Cessions(a)	(138)
U.S. Financial Lines | Net Of Impact Of Adverse Development Reinsurance Cover
Liability for Claims and Claims Adjustment Expense [Line Items]
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance from the table below	(11,241)
Liabilities for losses and loss adjustment expenses and prior year development before accident year 2013, net of reinsurance	(21)
Unallocated loss adjustment expense prior year development	2
Liabilities for losses and loss adjustment expenses and prior year loss development, net of reinsurance	5,899
U.S. Financial Lines | Unallocated To Accident Year
Liability for Claims and Claims Adjustment Expense [Line Items]
Unallocated loss adjustment expense prior year development	(12)
U.S. Property and Special Risks
Liability for Claims and Claims Adjustment Expense [Line Items]
Incurred losses and allocated loss adjustment expenses, undiscounted and net of reinsurance	34,430
2022 Prior Year Development Excluding the Impact of ADC	(81)
Incurred Impact of ADC	(254)
2022 (Net of Impact of ADC)	34,198
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance from the table below	27,778
Liabilities for losses and loss adjustment expenses and prior year development before accident year 2013, net of reinsurance	417
Liabilities for losses and loss adjustment expenses and prior year loss development, net of reinsurance	7,069
Prior Year Development Net of External Reinsurance After ADC Cessions(a)	(100)
Paid Impact of ADC	$ (85)
Year 1 (as a percent)	32.50%
Year 2 (as a percent)	33.10%
Year 3 (as a percent)	11.60%
Year 4 (as a percent)	7.60%
Year 5 (as a percent)	5.20%
Year 6 (as a percent)	3.10%
Year 7 (as a percent)	1.60%
Year 8 (as a percent)	1.20%
Year 9 (as a percent)	0.50%
Year 10 (as a percent)	1.40%
U.S. Property and Special Risks | Adverse Development Reinsurance
Liability for Claims and Claims Adjustment Expense [Line Items]
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance from the table below	$ 85
Liabilities for losses and loss adjustment expenses and prior year development before accident year 2013, net of reinsurance	(107)
Unallocated loss adjustment expense prior year development	3
Prior Year Development Net of External Reinsurance After ADC Cessions(a)	(19)
U.S. Property and Special Risks | 2013
Liability for Claims and Claims Adjustment Expense [Line Items]
Incurred losses and allocated loss adjustment expenses, undiscounted and net of reinsurance	2,438	2,417	2,428	2,435	2,443	2,441	2,428	2,382	2,525	2,524
2022 Prior Year Development Excluding the Impact of ADC	21
Total of IBNR Liabilities Plus Expected Development on Reported Losses	$ 27
Cumulative Number of Reported Claims | country	50,022
Incurred Impact of ADC	$ (41)
IBNR Impact of ADC	(20)
2022 (Net of Impact of ADC)	2,397	2,385	2,392	2,397	2,416	2,403	2,401
Total of IBNR Liabilities Net of Impact of ADC	7
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance from the table below	2,385	2,350	2,339	2,321	2,296	2,184	2,037	1,844	1,568	733
Prior Year Development Net of External Reinsurance After ADC Cessions(a)	12
Paid Impact of ADC	(12)
U.S. Property and Special Risks | 2013 | Adverse Development Reinsurance
Liability for Claims and Claims Adjustment Expense [Line Items]
Incurred Impact of ADC	(41)	(32)	(36)	(38)	(27)	(38)	(27)
Prior Year Development Net of External Reinsurance After ADC Cessions(a)	(9)
U.S. Property and Special Risks | 2014
Liability for Claims and Claims Adjustment Expense [Line Items]
Incurred losses and allocated loss adjustment expenses, undiscounted and net of reinsurance	2,719	2,725	2,745	2,763	2,783	2,765	2,779	2,708	2,940
2022 Prior Year Development Excluding the Impact of ADC	(6)
Total of IBNR Liabilities Plus Expected Development on Reported Losses	$ 57
Cumulative Number of Reported Claims | country	60,738
Incurred Impact of ADC	$ (76)
IBNR Impact of ADC	(36)
2022 (Net of Impact of ADC)	2,643	2,655	2,667	2,687	2,719	2,704	2,712
Total of IBNR Liabilities Net of Impact of ADC	21
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance from the table below	2,635	2,623	2,592	2,553	2,461	2,322	2,109	1,758	914
Prior Year Development Net of External Reinsurance After ADC Cessions(a)	(12)
Paid Impact of ADC	(17)
U.S. Property and Special Risks | 2014 | Adverse Development Reinsurance
Liability for Claims and Claims Adjustment Expense [Line Items]
Incurred Impact of ADC	(76)	(70)	(78)	(76)	(64)	(61)	(67)
Prior Year Development Net of External Reinsurance After ADC Cessions(a)	(6)
U.S. Property and Special Risks | 2015
Liability for Claims and Claims Adjustment Expense [Line Items]
Incurred losses and allocated loss adjustment expenses, undiscounted and net of reinsurance	2,869	2,859	2,852	2,856	2,892	2,903	2,973	3,100
2022 Prior Year Development Excluding the Impact of ADC	10
Total of IBNR Liabilities Plus Expected Development on Reported Losses	$ 41
Cumulative Number of Reported Claims | country	59,443
Incurred Impact of ADC	$ (115)
IBNR Impact of ADC	(31)
2022 (Net of Impact of ADC)	2,754	2,752	2,753	2,762	2,805	2,805	2,832
Total of IBNR Liabilities Net of Impact of ADC	10
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance from the table below	2,765	2,717	2,680	2,610	2,485	2,230	1,865	1,038
Prior Year Development Net of External Reinsurance After ADC Cessions(a)	2
Paid Impact of ADC	(56)
U.S. Property and Special Risks | 2015 | Adverse Development Reinsurance
Liability for Claims and Claims Adjustment Expense [Line Items]
Incurred Impact of ADC	(115)	(107)	(99)	(94)	(87)	(98)	(141)
Prior Year Development Net of External Reinsurance After ADC Cessions(a)	(8)
U.S. Property and Special Risks | 2016
Liability for Claims and Claims Adjustment Expense [Line Items]
Incurred losses and allocated loss adjustment expenses, undiscounted and net of reinsurance	3,065	3,060	3,076	3,084	3,094	3,177	3,143
2022 Prior Year Development Excluding the Impact of ADC	5
Total of IBNR Liabilities Plus Expected Development on Reported Losses	$ 12
Cumulative Number of Reported Claims | country	54,740
Incurred Impact of ADC	$ 0
IBNR Impact of ADC	0
2022 (Net of Impact of ADC)	3,065	3,060	3,076	3,084	3,094	3,177	3,143
Total of IBNR Liabilities Net of Impact of ADC	12
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance from the table below	2,962	2,880	2,797	2,611	2,358	2,025	1,004
Prior Year Development Net of External Reinsurance After ADC Cessions(a)	5
Paid Impact of ADC	0
U.S. Property and Special Risks | 2016 | Adverse Development Reinsurance
Liability for Claims and Claims Adjustment Expense [Line Items]
Incurred Impact of ADC	0	0	0	0	0	0	0
Prior Year Development Net of External Reinsurance After ADC Cessions(a)	0
U.S. Property and Special Risks | 2017
Liability for Claims and Claims Adjustment Expense [Line Items]
Incurred losses and allocated loss adjustment expenses, undiscounted and net of reinsurance	4,777	4,741	4,733	4,734	4,892	5,367
2022 Prior Year Development Excluding the Impact of ADC	36
Total of IBNR Liabilities Plus Expected Development on Reported Losses	$ 94
Cumulative Number of Reported Claims | country	79,644
Incurred Impact of ADC	$ 0
IBNR Impact of ADC	0
2022 (Net of Impact of ADC)	4,777	4,741	4,733	4,734	4,892	5,367
Total of IBNR Liabilities Net of Impact of ADC	94
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance from the table below	4,503	4,390	4,136	3,785	3,064	1,363
Prior Year Development Net of External Reinsurance After ADC Cessions(a)	36
Paid Impact of ADC	0
U.S. Property and Special Risks | 2017 | Adverse Development Reinsurance
Liability for Claims and Claims Adjustment Expense [Line Items]
Incurred Impact of ADC	0	0	0	0	0	0
Prior Year Development Net of External Reinsurance After ADC Cessions(a)	0
U.S. Property and Special Risks | 2018
Liability for Claims and Claims Adjustment Expense [Line Items]
Incurred losses and allocated loss adjustment expenses, undiscounted and net of reinsurance	3,863	3,882	3,667	3,711	3,674
2022 Prior Year Development Excluding the Impact of ADC	(19)
Total of IBNR Liabilities Plus Expected Development on Reported Losses	$ 258
Cumulative Number of Reported Claims | country	69,608
Incurred Impact of ADC	$ 0
IBNR Impact of ADC	0
2022 (Net of Impact of ADC)	3,863	3,882	3,667	3,711	3,674
Total of IBNR Liabilities Net of Impact of ADC	258
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance from the table below	3,427	3,254	3,009	2,618	1,066
Prior Year Development Net of External Reinsurance After ADC Cessions(a)	(19)
Paid Impact of ADC	0
U.S. Property and Special Risks | 2018 | Adverse Development Reinsurance
Liability for Claims and Claims Adjustment Expense [Line Items]
Incurred Impact of ADC	0	0	0	0	0
Prior Year Development Net of External Reinsurance After ADC Cessions(a)	0
U.S. Property and Special Risks | 2019
Liability for Claims and Claims Adjustment Expense [Line Items]
Incurred losses and allocated loss adjustment expenses, undiscounted and net of reinsurance	2,859	2,847	2,812	2,783
2022 Prior Year Development Excluding the Impact of ADC	12
Total of IBNR Liabilities Plus Expected Development on Reported Losses	$ 153
Cumulative Number of Reported Claims | country	78,576
Incurred Impact of ADC	$ 0
IBNR Impact of ADC	0
2022 (Net of Impact of ADC)	2,859	2,847	2,812	2,783
Total of IBNR Liabilities Net of Impact of ADC	153
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance from the table below	2,499	2,316	2,013	1,145
Prior Year Development Net of External Reinsurance After ADC Cessions(a)	12
Paid Impact of ADC	0
U.S. Property and Special Risks | 2019 | Adverse Development Reinsurance
Liability for Claims and Claims Adjustment Expense [Line Items]
Incurred Impact of ADC	0	0	0	0
Prior Year Development Net of External Reinsurance After ADC Cessions(a)	0
U.S. Property and Special Risks | 2020
Liability for Claims and Claims Adjustment Expense [Line Items]
Incurred losses and allocated loss adjustment expenses, undiscounted and net of reinsurance	4,497	4,469	4,483
2022 Prior Year Development Excluding the Impact of ADC	28
Total of IBNR Liabilities Plus Expected Development on Reported Losses	$ 1,127
Cumulative Number of Reported Claims | country	68,119
Incurred Impact of ADC	$ 0
IBNR Impact of ADC	0
2022 (Net of Impact of ADC)	4,497	4,469	4,483
Total of IBNR Liabilities Net of Impact of ADC	1,127
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance from the table below	2,747	2,348	1,191
Prior Year Development Net of External Reinsurance After ADC Cessions(a)	28
Paid Impact of ADC	0
U.S. Property and Special Risks | 2020 | Adverse Development Reinsurance
Liability for Claims and Claims Adjustment Expense [Line Items]
Incurred Impact of ADC	0	0	0
Prior Year Development Net of External Reinsurance After ADC Cessions(a)	0
U.S. Property and Special Risks | 2021
Liability for Claims and Claims Adjustment Expense [Line Items]
Incurred losses and allocated loss adjustment expenses, undiscounted and net of reinsurance	3,308	3,517
2022 Prior Year Development Excluding the Impact of ADC	(209)
Total of IBNR Liabilities Plus Expected Development on Reported Losses	$ 393
Cumulative Number of Reported Claims | country	80,684
Incurred Impact of ADC	$ 0
IBNR Impact of ADC	0
2022 (Net of Impact of ADC)	3,308	3,517
Total of IBNR Liabilities Net of Impact of ADC	393
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance from the table below	2,472	1,189
Prior Year Development Net of External Reinsurance After ADC Cessions(a)	(209)
Paid Impact of ADC	0
U.S. Property and Special Risks | 2021 | Adverse Development Reinsurance
Liability for Claims and Claims Adjustment Expense [Line Items]
Incurred Impact of ADC	0	0
Prior Year Development Net of External Reinsurance After ADC Cessions(a)	0
U.S. Property and Special Risks | 2022
Liability for Claims and Claims Adjustment Expense [Line Items]
Incurred losses and allocated loss adjustment expenses, undiscounted and net of reinsurance	4,035
2022 Prior Year Development Excluding the Impact of ADC
Total of IBNR Liabilities Plus Expected Development on Reported Losses	$ 1,781
Cumulative Number of Reported Claims | country	75,535
Incurred Impact of ADC	$ 0
IBNR Impact of ADC	0
2022 (Net of Impact of ADC)	4,035
Total of IBNR Liabilities Net of Impact of ADC	1,781
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance from the table below	1,383
Prior Year Development Net of External Reinsurance After ADC Cessions(a)
Paid Impact of ADC	0
U.S. Property and Special Risks | 2022 | Adverse Development Reinsurance
Liability for Claims and Claims Adjustment Expense [Line Items]
Incurred Impact of ADC	0
Prior Year Development Net of External Reinsurance After ADC Cessions(a)	0
U.S. Property and Special Risks | Short Duration Insurance Contracts Last Ten Accident Years
Liability for Claims and Claims Adjustment Expense [Line Items]
2022 Prior Year Development Excluding the Impact of ADC	(122)
Incurred Impact of ADC	(232)
2022 (Net of Impact of ADC)	34,198	30,308	26,583	22,158	19,600	16,456	11,088
Prior Year Development Net of External Reinsurance After ADC Cessions(a)	(145)
U.S. Property and Special Risks | Short Duration Insurance Contracts Last Ten Accident Years | Adverse Development Reinsurance
Liability for Claims and Claims Adjustment Expense [Line Items]
Incurred Impact of ADC	(232)	(209)	(213)	(208)	(178)	(197)	(235)
Prior Year Development Net of External Reinsurance After ADC Cessions(a)	(23)
U.S. Property and Special Risks | Shortduration Insurance Contracts Accident Years Prior To Current Year
Liability for Claims and Claims Adjustment Expense [Line Items]
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance from the table below	0
U.S. Property and Special Risks | Incurred Impact Of Adverse Development Cover
Liability for Claims and Claims Adjustment Expense [Line Items]
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance from the table below	85
Liabilities for losses and loss adjustment expenses and prior year development before accident year 2013, net of reinsurance	(107)
U.S. Property and Special Risks | Short Duration Insurance Contracts Accident Years Prior To2012
Liability for Claims and Claims Adjustment Expense [Line Items]
Liabilities for losses and loss adjustment expenses and prior year development before accident year 2013, net of reinsurance	47
Prior Year Development Net of External Reinsurance After ADC Cessions(a)	48
U.S. Property and Special Risks | Short Duration Insurance Contracts Accident Years Prior To2012 | Adverse Development Reinsurance
Liability for Claims and Claims Adjustment Expense [Line Items]
Prior Year Development Net of External Reinsurance After ADC Cessions(a)	1
U.S. Property and Special Risks | Net Of Impact Of Adverse Development Reinsurance Cover
Liability for Claims and Claims Adjustment Expense [Line Items]
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance from the table below	(27,693)
Liabilities for losses and loss adjustment expenses and prior year development before accident year 2013, net of reinsurance	310
Unallocated loss adjustment expense prior year development	(3)
Liabilities for losses and loss adjustment expenses and prior year loss development, net of reinsurance	6,815
U.S. Property and Special Risks | Unallocated To Accident Year
Liability for Claims and Claims Adjustment Expense [Line Items]
Unallocated loss adjustment expense prior year development	(6)
U.S. Personal Insurance
Liability for Claims and Claims Adjustment Expense [Line Items]
Incurred losses and allocated loss adjustment expenses, undiscounted and net of reinsurance	14,044
2022 Prior Year Development Excluding the Impact of ADC	(28)
Incurred Impact of ADC	(5)
2022 (Net of Impact of ADC)	14,028
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance from the table below	13,186
Liabilities for losses and loss adjustment expenses and prior year development before accident year 2013, net of reinsurance	(59)
Liabilities for losses and loss adjustment expenses and prior year loss development, net of reinsurance	799
Prior Year Development Net of External Reinsurance After ADC Cessions(a)	(32)
Paid Impact of ADC	$ (14)
Year 1 (as a percent)	61.70%
Year 2 (as a percent)	26.30%
Year 3 (as a percent)	5.50%
Year 4 (as a percent)	(0.50%)
Year 5 (as a percent)	1.80%
Year 6 (as a percent)	0.80%
Year 7 (as a percent)	0.40%
Year 8 (as a percent)	0.30%
Year 9 (as a percent)	0.20%
Year 10 (as a percent)	0.00%
U.S. Personal Insurance | Adverse Development Reinsurance
Liability for Claims and Claims Adjustment Expense [Line Items]
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance from the table below	$ 14
Liabilities for losses and loss adjustment expenses and prior year development before accident year 2013, net of reinsurance	(3)
Unallocated loss adjustment expense prior year development	0
Prior Year Development Net of External Reinsurance After ADC Cessions(a)	(4)
U.S. Personal Insurance | 2013
Liability for Claims and Claims Adjustment Expense [Line Items]
Incurred losses and allocated loss adjustment expenses, undiscounted and net of reinsurance	1,777	1,777	1,778	1,777	1,776	1,780	1,782	1,803	1,816	1,887
2022 Prior Year Development Excluding the Impact of ADC	0
Total of IBNR Liabilities Plus Expected Development on Reported Losses	$ 2
Cumulative Number of Reported Claims | country	335,448
Incurred Impact of ADC	$ (1)
IBNR Impact of ADC	0
2022 (Net of Impact of ADC)	1,776	1,776	1,776	1,776	1,774	1,774	1,774
Total of IBNR Liabilities Net of Impact of ADC	2
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance from the table below	1,774	1,775	1,774	1,772	1,766	1,759	1,744	1,705	1,634	1,109
Prior Year Development Net of External Reinsurance After ADC Cessions(a)	0
Paid Impact of ADC	(1)
U.S. Personal Insurance | 2013 | Adverse Development Reinsurance
Liability for Claims and Claims Adjustment Expense [Line Items]
Incurred Impact of ADC	(1)	(1)	(2)	(1)	(2)	(6)	(8)
Prior Year Development Net of External Reinsurance After ADC Cessions(a)	0
U.S. Personal Insurance | 2014
Liability for Claims and Claims Adjustment Expense [Line Items]
Incurred losses and allocated loss adjustment expenses, undiscounted and net of reinsurance	1,592	1,587	1,588	1,584	1,583	1,572	1,572	1,562	1,552
2022 Prior Year Development Excluding the Impact of ADC	5
Total of IBNR Liabilities Plus Expected Development on Reported Losses	$ 6
Cumulative Number of Reported Claims | country	275,096
Incurred Impact of ADC	$ (8)
IBNR Impact of ADC	0
2022 (Net of Impact of ADC)	1,584	1,582	1,584	1,580	1,571	1,564	1,564
Total of IBNR Liabilities Net of Impact of ADC	6
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance from the table below	1,579	1,572	1,568	1,555	1,536	1,507	1,463	1,380	959
Prior Year Development Net of External Reinsurance After ADC Cessions(a)	2
Paid Impact of ADC	(7)
U.S. Personal Insurance | 2014 | Adverse Development Reinsurance
Liability for Claims and Claims Adjustment Expense [Line Items]
Incurred Impact of ADC	(8)	(5)	(4)	(4)	(12)	(8)	(8)
Prior Year Development Net of External Reinsurance After ADC Cessions(a)	(3)
U.S. Personal Insurance | 2015
Liability for Claims and Claims Adjustment Expense [Line Items]
Incurred losses and allocated loss adjustment expenses, undiscounted and net of reinsurance	1,488	1,487	1,485	1,482	1,483	1,494	1,498	1,511
2022 Prior Year Development Excluding the Impact of ADC	1
Total of IBNR Liabilities Plus Expected Development on Reported Losses	$ 11
Cumulative Number of Reported Claims | country	261,060
Incurred Impact of ADC	$ (7)
IBNR Impact of ADC	(1)
2022 (Net of Impact of ADC)	1,481	1,482	1,480	1,476	1,472	1,475	1,476
Total of IBNR Liabilities Net of Impact of ADC	10
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance from the table below	1,468	1,463	1,461	1,455	1,439	1,411	1,320	931
Prior Year Development Net of External Reinsurance After ADC Cessions(a)	(1)
Paid Impact of ADC	(6)
U.S. Personal Insurance | 2015 | Adverse Development Reinsurance
Liability for Claims and Claims Adjustment Expense [Line Items]
Incurred Impact of ADC	(7)	(5)	(5)	(6)	(11)	(19)	(22)
Prior Year Development Net of External Reinsurance After ADC Cessions(a)	(2)
U.S. Personal Insurance | 2016
Liability for Claims and Claims Adjustment Expense [Line Items]
Incurred losses and allocated loss adjustment expenses, undiscounted and net of reinsurance	1,544	1,544	1,542	1,540	1,533	1,533	1,536
2022 Prior Year Development Excluding the Impact of ADC	0
Total of IBNR Liabilities Plus Expected Development on Reported Losses	$ 16
Cumulative Number of Reported Claims | country	247,328
Incurred Impact of ADC	$ 0
IBNR Impact of ADC	0
2022 (Net of Impact of ADC)	1,544	1,544	1,542	1,540	1,533	1,533	1,536
Total of IBNR Liabilities Net of Impact of ADC	16
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance from the table below	1,518	1,512	1,501	1,460	1,422	1,344	857
Prior Year Development Net of External Reinsurance After ADC Cessions(a)	0
Paid Impact of ADC	0
U.S. Personal Insurance | 2016 | Adverse Development Reinsurance
Liability for Claims and Claims Adjustment Expense [Line Items]
Incurred Impact of ADC	0	0	0	0	0	0	0
Prior Year Development Net of External Reinsurance After ADC Cessions(a)	0
U.S. Personal Insurance | 2017
Liability for Claims and Claims Adjustment Expense [Line Items]
Incurred losses and allocated loss adjustment expenses, undiscounted and net of reinsurance	1,916	1,924	2,057	2,011	2,137	1,878
2022 Prior Year Development Excluding the Impact of ADC	(8)
Total of IBNR Liabilities Plus Expected Development on Reported Losses	$ 37
Cumulative Number of Reported Claims | country	219,816
Incurred Impact of ADC	$ 0
IBNR Impact of ADC	0
2022 (Net of Impact of ADC)	1,916	1,924	2,057	2,011	2,137	1,878
Total of IBNR Liabilities Net of Impact of ADC	37
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance from the table below	1,852	1,826	1,789	1,896	1,672	941
Prior Year Development Net of External Reinsurance After ADC Cessions(a)	(8)
Paid Impact of ADC	0
U.S. Personal Insurance | 2017 | Adverse Development Reinsurance
Liability for Claims and Claims Adjustment Expense [Line Items]
Incurred Impact of ADC	0	0	0	0	0	0
Prior Year Development Net of External Reinsurance After ADC Cessions(a)	0
U.S. Personal Insurance | 2018
Liability for Claims and Claims Adjustment Expense [Line Items]
Incurred losses and allocated loss adjustment expenses, undiscounted and net of reinsurance	1,936	1,937	2,154	2,193	2,188
2022 Prior Year Development Excluding the Impact of ADC	(1)
Total of IBNR Liabilities Plus Expected Development on Reported Losses	$ 36
Cumulative Number of Reported Claims | country	102,027
Incurred Impact of ADC	$ 0
IBNR Impact of ADC	0
2022 (Net of Impact of ADC)	1,936	1,937	2,154	2,193	2,188
Total of IBNR Liabilities Net of Impact of ADC	36
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance from the table below	1,832	1,789	1,973	1,939	1,227
Prior Year Development Net of External Reinsurance After ADC Cessions(a)	(1)
Paid Impact of ADC	0
U.S. Personal Insurance | 2018 | Adverse Development Reinsurance
Liability for Claims and Claims Adjustment Expense [Line Items]
Incurred Impact of ADC	0	0	0	0	0
Prior Year Development Net of External Reinsurance After ADC Cessions(a)	0
U.S. Personal Insurance | 2019
Liability for Claims and Claims Adjustment Expense [Line Items]
Incurred losses and allocated loss adjustment expenses, undiscounted and net of reinsurance	1,596	1,646	1,664	1,593
2022 Prior Year Development Excluding the Impact of ADC	(50)
Total of IBNR Liabilities Plus Expected Development on Reported Losses	$ 95
Cumulative Number of Reported Claims | country	92,763
Incurred Impact of ADC	$ 0
IBNR Impact of ADC	0
2022 (Net of Impact of ADC)	1,596	1,646	1,664	1,593
Total of IBNR Liabilities Net of Impact of ADC	95
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance from the table below	1,416	1,379	1,295	884
Prior Year Development Net of External Reinsurance After ADC Cessions(a)	(50)
Paid Impact of ADC	0
U.S. Personal Insurance | 2019 | Adverse Development Reinsurance
Liability for Claims and Claims Adjustment Expense [Line Items]
Incurred Impact of ADC	0	0	0	0
Prior Year Development Net of External Reinsurance After ADC Cessions(a)	0
U.S. Personal Insurance | 2020
Liability for Claims and Claims Adjustment Expense [Line Items]
Incurred losses and allocated loss adjustment expenses, undiscounted and net of reinsurance	913	906	954
2022 Prior Year Development Excluding the Impact of ADC	7
Total of IBNR Liabilities Plus Expected Development on Reported Losses	$ 75
Cumulative Number of Reported Claims | country	54,375
Incurred Impact of ADC	$ 0
IBNR Impact of ADC	0
2022 (Net of Impact of ADC)	913	906	954
Total of IBNR Liabilities Net of Impact of ADC	75
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance from the table below	725	679	667
Prior Year Development Net of External Reinsurance After ADC Cessions(a)	7
Paid Impact of ADC	0
U.S. Personal Insurance | 2020 | Adverse Development Reinsurance
Liability for Claims and Claims Adjustment Expense [Line Items]
Incurred Impact of ADC	0	0	0
Prior Year Development Net of External Reinsurance After ADC Cessions(a)	0
U.S. Personal Insurance | 2021
Liability for Claims and Claims Adjustment Expense [Line Items]
Incurred losses and allocated loss adjustment expenses, undiscounted and net of reinsurance	765	748
2022 Prior Year Development Excluding the Impact of ADC	17
Total of IBNR Liabilities Plus Expected Development on Reported Losses	$ 90
Cumulative Number of Reported Claims | country	53,806
Incurred Impact of ADC	$ 0
IBNR Impact of ADC	0
2022 (Net of Impact of ADC)	765	748
Total of IBNR Liabilities Net of Impact of ADC	90
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance from the table below	650	488
Prior Year Development Net of External Reinsurance After ADC Cessions(a)	17
Paid Impact of ADC	0
U.S. Personal Insurance | 2021 | Adverse Development Reinsurance
Liability for Claims and Claims Adjustment Expense [Line Items]
Incurred Impact of ADC	0	0
Prior Year Development Net of External Reinsurance After ADC Cessions(a)	0
U.S. Personal Insurance | 2022
Liability for Claims and Claims Adjustment Expense [Line Items]
Incurred losses and allocated loss adjustment expenses, undiscounted and net of reinsurance	517
2022 Prior Year Development Excluding the Impact of ADC
Total of IBNR Liabilities Plus Expected Development on Reported Losses	$ 99
Cumulative Number of Reported Claims | country	37,022
Incurred Impact of ADC	$ 0
IBNR Impact of ADC	0
2022 (Net of Impact of ADC)	517
Total of IBNR Liabilities Net of Impact of ADC	99
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance from the table below	372
Prior Year Development Net of External Reinsurance After ADC Cessions(a)
Paid Impact of ADC	0
U.S. Personal Insurance | 2022 | Adverse Development Reinsurance
Liability for Claims and Claims Adjustment Expense [Line Items]
Incurred Impact of ADC	0
Prior Year Development Net of External Reinsurance After ADC Cessions(a)	0
U.S. Personal Insurance | Short Duration Insurance Contracts Last Ten Accident Years
Liability for Claims and Claims Adjustment Expense [Line Items]
2022 Prior Year Development Excluding the Impact of ADC	(29)
Incurred Impact of ADC	(16)
2022 (Net of Impact of ADC)	14,028	13,545	13,211	12,169	10,675	8,224	6,350
Prior Year Development Net of External Reinsurance After ADC Cessions(a)	(34)
U.S. Personal Insurance | Short Duration Insurance Contracts Last Ten Accident Years | Adverse Development Reinsurance
Liability for Claims and Claims Adjustment Expense [Line Items]
Incurred Impact of ADC	(16)	(11)	(11)	(11)	(25)	(33)	(38)
Prior Year Development Net of External Reinsurance After ADC Cessions(a)	(5)
U.S. Personal Insurance | Shortduration Insurance Contracts Accident Years Prior To Current Year
Liability for Claims and Claims Adjustment Expense [Line Items]
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance from the table below	0
U.S. Personal Insurance | Incurred Impact Of Adverse Development Cover
Liability for Claims and Claims Adjustment Expense [Line Items]
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance from the table below	14
Liabilities for losses and loss adjustment expenses and prior year development before accident year 2013, net of reinsurance	(3)
U.S. Personal Insurance | Short Duration Insurance Contracts Accident Years Prior To2012
Liability for Claims and Claims Adjustment Expense [Line Items]
Liabilities for losses and loss adjustment expenses and prior year development before accident year 2013, net of reinsurance	1
Prior Year Development Net of External Reinsurance After ADC Cessions(a)	2
U.S. Personal Insurance | Short Duration Insurance Contracts Accident Years Prior To2012 | Adverse Development Reinsurance
Liability for Claims and Claims Adjustment Expense [Line Items]
Prior Year Development Net of External Reinsurance After ADC Cessions(a)	1
U.S. Personal Insurance | Net Of Impact Of Adverse Development Reinsurance Cover
Liability for Claims and Claims Adjustment Expense [Line Items]
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance from the table below	(13,172)
Liabilities for losses and loss adjustment expenses and prior year development before accident year 2013, net of reinsurance	(62)
Unallocated loss adjustment expense prior year development	0
Liabilities for losses and loss adjustment expenses and prior year loss development, net of reinsurance	794
U.S. Personal Insurance | Unallocated To Accident Year
Liability for Claims and Claims Adjustment Expense [Line Items]
Unallocated loss adjustment expense prior year development	0
UK/Europe Casualty and Financial lines
Liability for Claims and Claims Adjustment Expense [Line Items]
Incurred losses and allocated loss adjustment expenses, undiscounted and net of reinsurance	13,047
2022 Prior Year Development Excluding the Impact of ADC	82
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance from the table below	6,856
Liabilities for losses and loss adjustment expenses and prior year development before accident year 2013, net of reinsurance	793
Liabilities for losses and loss adjustment expenses and prior year loss development, net of reinsurance	6,984
Prior Year Development Net of External Reinsurance After ADC Cessions(a)	$ 82
Year 1 (as a percent)	6.10%
Year 2 (as a percent)	15.50%
Year 3 (as a percent)	12.80%
Year 4 (as a percent)	11.40%
Year 5 (as a percent)	9.80%
Year 6 (as a percent)	9.70%
Year 7 (as a percent)	6.60%
Year 8 (as a percent)	4.40%
Year 9 (as a percent)	3.10%
Year 10 (as a percent)	2.90%
UK/Europe Casualty and Financial lines | 2013
Liability for Claims and Claims Adjustment Expense [Line Items]
Incurred losses and allocated loss adjustment expenses, undiscounted and net of reinsurance	$ 1,133	1,119	1,124	1,101	1,054	1,011	980	996	1,022	979
2022 Prior Year Development Excluding the Impact of ADC	14
Total of IBNR Liabilities Plus Expected Development on Reported Losses	$ 48
Cumulative Number of Reported Claims | country	109,297
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance from the table below	$ 992	959	929	883	805	696	587	461	321	85
UK/Europe Casualty and Financial lines | 2014
Liability for Claims and Claims Adjustment Expense [Line Items]
Incurred losses and allocated loss adjustment expenses, undiscounted and net of reinsurance	1,077	1,052	1,011	1,070	981	984	979	954	979
2022 Prior Year Development Excluding the Impact of ADC	25
Total of IBNR Liabilities Plus Expected Development on Reported Losses	$ 73
Cumulative Number of Reported Claims | country	101,355
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance from the table below	$ 817	778	720	660	598	503	389	245	68
UK/Europe Casualty and Financial lines | 2015
Liability for Claims and Claims Adjustment Expense [Line Items]
Incurred losses and allocated loss adjustment expenses, undiscounted and net of reinsurance	1,190	1,184	1,179	1,188	1,109	1,200	1,167	1,034
2022 Prior Year Development Excluding the Impact of ADC	6
Total of IBNR Liabilities Plus Expected Development on Reported Losses	$ 61
Cumulative Number of Reported Claims | country	112,087
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance from the table below	$ 952	909	824	653	542	414	228	68
UK/Europe Casualty and Financial lines | 2016
Liability for Claims and Claims Adjustment Expense [Line Items]
Incurred losses and allocated loss adjustment expenses, undiscounted and net of reinsurance	1,519	1,525	1,529	1,430	1,427	1,383	1,242
2022 Prior Year Development Excluding the Impact of ADC	(6)
Total of IBNR Liabilities Plus Expected Development on Reported Losses	$ 137
Cumulative Number of Reported Claims | country	141,037
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance from the table below	$ 1,118	1,014	888	740	558	359	114
UK/Europe Casualty and Financial lines | 2017
Liability for Claims and Claims Adjustment Expense [Line Items]
Incurred losses and allocated loss adjustment expenses, undiscounted and net of reinsurance	1,326	1,317	1,258	1,186	1,256	1,270
2022 Prior Year Development Excluding the Impact of ADC	9
Total of IBNR Liabilities Plus Expected Development on Reported Losses	$ 199
Cumulative Number of Reported Claims | country	148,408
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance from the table below	$ 859	720	575	424	266	92
UK/Europe Casualty and Financial lines | 2018
Liability for Claims and Claims Adjustment Expense [Line Items]
Incurred losses and allocated loss adjustment expenses, undiscounted and net of reinsurance	1,490	1,444	1,407	1,342	1,315
2022 Prior Year Development Excluding the Impact of ADC	46
Total of IBNR Liabilities Plus Expected Development on Reported Losses	$ 277
Cumulative Number of Reported Claims | country	152,379
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance from the table below	$ 863	707	546	357	107
UK/Europe Casualty and Financial lines | 2019
Liability for Claims and Claims Adjustment Expense [Line Items]
Incurred losses and allocated loss adjustment expenses, undiscounted and net of reinsurance	1,307	1,268	1,197	1,176
2022 Prior Year Development Excluding the Impact of ADC	39
Total of IBNR Liabilities Plus Expected Development on Reported Losses	$ 359
Cumulative Number of Reported Claims | country	141,643
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance from the table below	$ 628	455	295	94
UK/Europe Casualty and Financial lines | 2020
Liability for Claims and Claims Adjustment Expense [Line Items]
Incurred losses and allocated loss adjustment expenses, undiscounted and net of reinsurance	1,144	1,208	1,157
2022 Prior Year Development Excluding the Impact of ADC	(64)
Total of IBNR Liabilities Plus Expected Development on Reported Losses	$ 603
Cumulative Number of Reported Claims | country	88,677
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance from the table below	$ 348	217	57
UK/Europe Casualty and Financial lines | 2021
Liability for Claims and Claims Adjustment Expense [Line Items]
Incurred losses and allocated loss adjustment expenses, undiscounted and net of reinsurance	1,308	1,309
2022 Prior Year Development Excluding the Impact of ADC	(1)
Total of IBNR Liabilities Plus Expected Development on Reported Losses	$ 847
Cumulative Number of Reported Claims | country	74,872
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance from the table below	$ 224	49
UK/Europe Casualty and Financial lines | 2022
Liability for Claims and Claims Adjustment Expense [Line Items]
Incurred losses and allocated loss adjustment expenses, undiscounted and net of reinsurance	1,553
2022 Prior Year Development Excluding the Impact of ADC
Total of IBNR Liabilities Plus Expected Development on Reported Losses	$ 1,033
Cumulative Number of Reported Claims | country	58,460
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance from the table below	$ 55
UK/Europe Casualty and Financial lines | Short Duration Insurance Contracts Last Ten Accident Years
Liability for Claims and Claims Adjustment Expense [Line Items]
2022 Prior Year Development Excluding the Impact of ADC	68
UK/Europe Casualty and Financial lines | Shortduration Insurance Contracts Accident Years Prior To Current Year
Liability for Claims and Claims Adjustment Expense [Line Items]
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance from the table below	0
UK/Europe Casualty and Financial lines | Short Duration Insurance Contracts Accident Years Prior To2012
Liability for Claims and Claims Adjustment Expense [Line Items]
Liabilities for losses and loss adjustment expenses and prior year development before accident year 2013, net of reinsurance	14
UK/Europe Casualty and Financial lines | Unallocated To Accident Year
Liability for Claims and Claims Adjustment Expense [Line Items]
Unallocated loss adjustment expense prior year development	0
UK/Europe Property and Special Risks
Liability for Claims and Claims Adjustment Expense [Line Items]
Incurred losses and allocated loss adjustment expenses, undiscounted and net of reinsurance	13,175
2022 Prior Year Development Excluding the Impact of ADC	(153)
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance from the table below	10,514
Liabilities for losses and loss adjustment expenses and prior year development before accident year 2013, net of reinsurance	56
Liabilities for losses and loss adjustment expenses and prior year loss development, net of reinsurance	2,717
Prior Year Development Net of External Reinsurance After ADC Cessions(a)	$ (153)
Year 1 (as a percent)	22.20%
Year 2 (as a percent)	38.30%
Year 3 (as a percent)	16.50%
Year 4 (as a percent)	7.50%
Year 5 (as a percent)	2.80%
Year 6 (as a percent)	1.90%
Year 7 (as a percent)	0.80%
Year 8 (as a percent)	0.50%
Year 9 (as a percent)	0.40%
Year 10 (as a percent)	0.20%
UK/Europe Property and Special Risks | 2013
Liability for Claims and Claims Adjustment Expense [Line Items]
Incurred losses and allocated loss adjustment expenses, undiscounted and net of reinsurance	$ 1,199	1,200	1,201	1,209	1,226	1,235	1,251	1,271	1,380	1,383
2022 Prior Year Development Excluding the Impact of ADC	(1)
Total of IBNR Liabilities Plus Expected Development on Reported Losses	$ 5
Cumulative Number of Reported Claims | country	40,096
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance from the table below	$ 1,176	1,174	1,172	1,166	1,156	1,135	1,087	1,013	791	321
UK/Europe Property and Special Risks | 2014
Liability for Claims and Claims Adjustment Expense [Line Items]
Incurred losses and allocated loss adjustment expenses, undiscounted and net of reinsurance	1,369	1,371	1,376	1,414	1,441	1,432	1,442	1,460	1,434
2022 Prior Year Development Excluding the Impact of ADC	(2)
Total of IBNR Liabilities Plus Expected Development on Reported Losses	$ 3
Cumulative Number of Reported Claims | country	48,543
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance from the table below	$ 1,341	1,332	1,320	1,311	1,285	1,246	1,178	900	308
UK/Europe Property and Special Risks | 2015
Liability for Claims and Claims Adjustment Expense [Line Items]
Incurred losses and allocated loss adjustment expenses, undiscounted and net of reinsurance	1,399	1,405	1,419	1,429	1,455	1,486	1,499	1,542
2022 Prior Year Development Excluding the Impact of ADC	(6)
Total of IBNR Liabilities Plus Expected Development on Reported Losses	$ 13
Cumulative Number of Reported Claims | country	54,054
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance from the table below	$ 1,347	1,345	1,336	1,314	1,278	1,175	899	337
UK/Europe Property and Special Risks | 2016
Liability for Claims and Claims Adjustment Expense [Line Items]
Incurred losses and allocated loss adjustment expenses, undiscounted and net of reinsurance	1,614	1,635	1,641	1,644	1,641	1,649	1,508
2022 Prior Year Development Excluding the Impact of ADC	(21)
Total of IBNR Liabilities Plus Expected Development on Reported Losses	$ 12
Cumulative Number of Reported Claims | country	57,174
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance from the table below	$ 1,551	1,535	1,507	1,463	1,330	1,083	443
UK/Europe Property and Special Risks | 2017
Liability for Claims and Claims Adjustment Expense [Line Items]
Incurred losses and allocated loss adjustment expenses, undiscounted and net of reinsurance	1,558	1,582	1,599	1,593	1,598	1,625
2022 Prior Year Development Excluding the Impact of ADC	(24)
Total of IBNR Liabilities Plus Expected Development on Reported Losses	$ 22
Cumulative Number of Reported Claims | country	53,706
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance from the table below	$ 1,441	1,403	1,348	1,203	924	345
UK/Europe Property and Special Risks | 2018
Liability for Claims and Claims Adjustment Expense [Line Items]
Incurred losses and allocated loss adjustment expenses, undiscounted and net of reinsurance	1,426	1,495	1,486	1,508	1,498
2022 Prior Year Development Excluding the Impact of ADC	(69)
Total of IBNR Liabilities Plus Expected Development on Reported Losses	$ 31
Cumulative Number of Reported Claims | country	44,504
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance from the table below	$ 1,277	1,263	1,138	956	307
UK/Europe Property and Special Risks | 2019
Liability for Claims and Claims Adjustment Expense [Line Items]
Incurred losses and allocated loss adjustment expenses, undiscounted and net of reinsurance	1,108	1,083	1,107	1,138
2022 Prior Year Development Excluding the Impact of ADC	25
Total of IBNR Liabilities Plus Expected Development on Reported Losses	$ 76
Cumulative Number of Reported Claims | country	33,563
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance from the table below	$ 887	799	632	258
UK/Europe Property and Special Risks | 2020
Liability for Claims and Claims Adjustment Expense [Line Items]
Incurred losses and allocated loss adjustment expenses, undiscounted and net of reinsurance	1,214	1,236	1,293
2022 Prior Year Development Excluding the Impact of ADC	(22)
Total of IBNR Liabilities Plus Expected Development on Reported Losses	$ 193
Cumulative Number of Reported Claims | country	25,634
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance from the table below	$ 815	664	250
UK/Europe Property and Special Risks | 2021
Liability for Claims and Claims Adjustment Expense [Line Items]
Incurred losses and allocated loss adjustment expenses, undiscounted and net of reinsurance	965	994
2022 Prior Year Development Excluding the Impact of ADC	(29)
Total of IBNR Liabilities Plus Expected Development on Reported Losses	$ 213
Cumulative Number of Reported Claims | country	20,675
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance from the table below	$ 489	185
UK/Europe Property and Special Risks | 2022
Liability for Claims and Claims Adjustment Expense [Line Items]
Incurred losses and allocated loss adjustment expenses, undiscounted and net of reinsurance	1,323
2022 Prior Year Development Excluding the Impact of ADC
Total of IBNR Liabilities Plus Expected Development on Reported Losses	$ 476
Cumulative Number of Reported Claims | country	16,150
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance from the table below	$ 190
UK/Europe Property and Special Risks | Short Duration Insurance Contracts Last Ten Accident Years
Liability for Claims and Claims Adjustment Expense [Line Items]
2022 Prior Year Development Excluding the Impact of ADC	(149)
UK/Europe Property and Special Risks | Shortduration Insurance Contracts Accident Years Prior To Current Year
Liability for Claims and Claims Adjustment Expense [Line Items]
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance from the table below	0
UK/Europe Property and Special Risks | Short Duration Insurance Contracts Accident Years Prior To2012
Liability for Claims and Claims Adjustment Expense [Line Items]
Liabilities for losses and loss adjustment expenses and prior year development before accident year 2013, net of reinsurance	(4)
UK/Europe Property and Special Risks | Unallocated To Accident Year
Liability for Claims and Claims Adjustment Expense [Line Items]
Unallocated loss adjustment expense prior year development	0
UK/Europe and Japan Personal Insurance
Liability for Claims and Claims Adjustment Expense [Line Items]
Incurred losses and allocated loss adjustment expenses, undiscounted and net of reinsurance	21,106
2022 Prior Year Development Excluding the Impact of ADC	(111)
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance from the table below	19,520
Liabilities for losses and loss adjustment expenses and prior year development before accident year 2013, net of reinsurance	42
Liabilities for losses and loss adjustment expenses and prior year loss development, net of reinsurance	1,628
Prior Year Development Net of External Reinsurance After ADC Cessions(a)	$ (111)
Year 1 (as a percent)	57.40%
Year 2 (as a percent)	26.30%
Year 3 (as a percent)	7.40%
Year 4 (as a percent)	3.80%
Year 5 (as a percent)	1.90%
Year 6 (as a percent)	1.10%
Year 7 (as a percent)	0.60%
Year 8 (as a percent)	0.40%
Year 9 (as a percent)	0.20%
Year 10 (as a percent)	0.10%
UK/Europe and Japan Personal Insurance | 2013
Liability for Claims and Claims Adjustment Expense [Line Items]
Incurred losses and allocated loss adjustment expenses, undiscounted and net of reinsurance	$ 2,246	2,245	2,245	2,245	2,247	2,252	2,257	2,256	2,286	2,285
2022 Prior Year Development Excluding the Impact of ADC	1
Total of IBNR Liabilities Plus Expected Development on Reported Losses	$ 2
Cumulative Number of Reported Claims | country	1,736,957
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance from the table below	$ 2,238	2,236	2,232	2,225	2,214	2,189	2,142	2,052	1,870	$ 1,249
UK/Europe and Japan Personal Insurance | 2014
Liability for Claims and Claims Adjustment Expense [Line Items]
Incurred losses and allocated loss adjustment expenses, undiscounted and net of reinsurance	2,239	2,242	2,243	2,241	2,242	2,249	2,251	2,266	2,256
2022 Prior Year Development Excluding the Impact of ADC	(3)
Total of IBNR Liabilities Plus Expected Development on Reported Losses	$ 2
Cumulative Number of Reported Claims | country	1,795,535
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance from the table below	$ 2,228	2,223	2,214	2,203	2,182	2,134	2,041	1,854	$ 1,227
UK/Europe and Japan Personal Insurance | 2015
Liability for Claims and Claims Adjustment Expense [Line Items]
Incurred losses and allocated loss adjustment expenses, undiscounted and net of reinsurance	2,293	2,295	2,295	2,295	2,296	2,306	2,304	2,324
2022 Prior Year Development Excluding the Impact of ADC	(2)
Total of IBNR Liabilities Plus Expected Development on Reported Losses	$ 2
Cumulative Number of Reported Claims | country	1,776,269
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance from the table below	$ 2,273	2,264	2,247	2,221	2,184	2,083	1,895	$ 1,251
UK/Europe and Japan Personal Insurance | 2016
Liability for Claims and Claims Adjustment Expense [Line Items]
Incurred losses and allocated loss adjustment expenses, undiscounted and net of reinsurance	2,251	2,255	2,258	2,260	2,265	2,279	2,281
2022 Prior Year Development Excluding the Impact of ADC	(4)
Total of IBNR Liabilities Plus Expected Development on Reported Losses	$ 4
Cumulative Number of Reported Claims | country	1,798,323
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance from the table below	$ 2,223	2,208	2,183	2,137	2,047	1,864	$ 1,251
UK/Europe and Japan Personal Insurance | 2017
Liability for Claims and Claims Adjustment Expense [Line Items]
Incurred losses and allocated loss adjustment expenses, undiscounted and net of reinsurance	2,152	2,155	2,138	2,142	2,157	2,234
2022 Prior Year Development Excluding the Impact of ADC	(3)
Total of IBNR Liabilities Plus Expected Development on Reported Losses	$ 4
Cumulative Number of Reported Claims | country	1,724,404
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance from the table below	$ 2,112	2,091	2,055	1,984	1,823	$ 1,224
UK/Europe and Japan Personal Insurance | 2018
Liability for Claims and Claims Adjustment Expense [Line Items]
Incurred losses and allocated loss adjustment expenses, undiscounted and net of reinsurance	2,492	2,488	2,514	2,515	2,605
2022 Prior Year Development Excluding the Impact of ADC	4
Total of IBNR Liabilities Plus Expected Development on Reported Losses	$ 19
Cumulative Number of Reported Claims | country	1,889,426
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance from the table below	$ 2,409	2,365	2,280	2,113	$ 1,554
UK/Europe and Japan Personal Insurance | 2019
Liability for Claims and Claims Adjustment Expense [Line Items]
Incurred losses and allocated loss adjustment expenses, undiscounted and net of reinsurance	2,019	2,027	2,062	2,092
2022 Prior Year Development Excluding the Impact of ADC	(8)
Total of IBNR Liabilities Plus Expected Development on Reported Losses	$ 15
Cumulative Number of Reported Claims | country	1,666,974
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance from the table below	$ 1,929	1,867	1,739	$ 1,226
UK/Europe and Japan Personal Insurance | 2020
Liability for Claims and Claims Adjustment Expense [Line Items]
Incurred losses and allocated loss adjustment expenses, undiscounted and net of reinsurance	1,747	1,777	1,914
2022 Prior Year Development Excluding the Impact of ADC	(30)
Total of IBNR Liabilities Plus Expected Development on Reported Losses	$ 61
Cumulative Number of Reported Claims | country	1,390,787
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance from the table below	$ 1,580	1,474	$ 1,023
UK/Europe and Japan Personal Insurance | 2021
Liability for Claims and Claims Adjustment Expense [Line Items]
Incurred losses and allocated loss adjustment expenses, undiscounted and net of reinsurance	1,734	1,803
2022 Prior Year Development Excluding the Impact of ADC	(69)
Total of IBNR Liabilities Plus Expected Development on Reported Losses	$ 114
Cumulative Number of Reported Claims | country	1,357,947
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance from the table below	$ 1,424	$ 1,005
UK/Europe and Japan Personal Insurance | 2022
Liability for Claims and Claims Adjustment Expense [Line Items]
Incurred losses and allocated loss adjustment expenses, undiscounted and net of reinsurance	1,933
2022 Prior Year Development Excluding the Impact of ADC
Total of IBNR Liabilities Plus Expected Development on Reported Losses	$ 286
Cumulative Number of Reported Claims | country	1,837,966
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance from the table below	$ 1,104
UK/Europe and Japan Personal Insurance | Short Duration Insurance Contracts Last Ten Accident Years
Liability for Claims and Claims Adjustment Expense [Line Items]
2022 Prior Year Development Excluding the Impact of ADC	(114)
UK/Europe and Japan Personal Insurance | Shortduration Insurance Contracts Accident Years Prior To Current Year
Liability for Claims and Claims Adjustment Expense [Line Items]
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance from the table below	0
UK/Europe and Japan Personal Insurance | Short Duration Insurance Contracts Accident Years Prior To2012
Liability for Claims and Claims Adjustment Expense [Line Items]
Liabilities for losses and loss adjustment expenses and prior year development before accident year 2013, net of reinsurance	3
UK/Europe and Japan Personal Insurance | Unallocated To Accident Year
Liability for Claims and Claims Adjustment Expense [Line Items]
Unallocated loss adjustment expense prior year development	$ 0