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Reserve for Unpaid Losses and Loss Adjustment Expenses - Historical Loss Development Triangles, P&C (Details) claim in Millions, $ in Millions	Dec. 31, 2020 USD ($) claim	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)	Dec. 31, 2012 USD ($)	Dec. 31, 2011 USD ($)
Workers’ compensation
Claims Development [Line Items]
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	$ 10,633
Workers’ compensation | 2011
Claims Development [Line Items]
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	2,235	$ 2,239	$ 2,242	$ 2,232	$ 2,224	$ 2,221	$ 2,206	$ 2,204	$ 2,099	$ 2,013
IBNR Reserves	$ 291
Claims Reported | claim	177,961
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	$ 1,811	1,786	1,746	1,690	1,622	1,518	1,368	1,156	841	371
Workers’ compensation | 2012
Claims Development [Line Items]
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	2,135	2,146	2,154	2,169	2,168	2,181	2,207	2,207	2,185
IBNR Reserves	$ 325
Claims Reported | claim	171,494
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	$ 1,678	1,644	1,587	1,529	1,436	1,313	1,106	809	359
Workers’ compensation | 2013
Claims Development [Line Items]
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	1,831	1,850	1,861	1,861	1,883	1,920	1,981	2,020
IBNR Reserves	$ 378
Claims Reported | claim	151,422
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	$ 1,339	1,304	1,260	1,175	1,071	917	675	304
Workers’ compensation | 2014
Claims Development [Line Items]
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	1,679	1,692	1,713	1,761	1,789	1,838	1,869
IBNR Reserves	$ 437
Claims Reported | claim	126,217
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	$ 1,137	1,099	1,041	960	811	598	275
Workers’ compensation | 2015
Claims Development [Line Items]
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	1,699	1,714	1,724	1,801	1,835	1,873
IBNR Reserves	$ 477
Claims Reported | claim	113,966
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	$ 1,068	1,004	909	778	576	261
Workers’ compensation | 2016
Claims Development [Line Items]
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	1,748	1,767	1,780	1,772	1,772
IBNR Reserves	$ 574
Claims Reported | claim	112,058
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	$ 1,003	908	779	579	255
Workers’ compensation | 2017
Claims Development [Line Items]
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	1,822	1,840	1,869	1,862
IBNR Reserves	$ 753
Claims Reported | claim	111,510
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	$ 900	778	575	261
Workers’ compensation | 2018
Claims Development [Line Items]
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	1,915	1,917	1,916
IBNR Reserves	$ 854
Claims Reported | claim	117,999
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	$ 837	624	283
Workers’ compensation | 2019
Claims Development [Line Items]
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	1,935	1,937
IBNR Reserves	$ 1,033
Claims Reported | claim	117,698
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	$ 637	291
Workers’ compensation | 2020
Claims Development [Line Items]
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	1,865
IBNR Reserves	$ 1,412
Claims Reported | claim	84,062
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	$ 223
General liability
Claims Development [Line Items]
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	2,946
General liability | 2011
Claims Development [Line Items]
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	416	420	426	417	416	404	405	408	420	431
IBNR Reserves	$ 40
Claims Reported | claim	22,394
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	$ 368	362	348	330	303	255	200	123	61	15
General liability | 2012
Claims Development [Line Items]
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	407	413	421	408	410	392	399	402	423
IBNR Reserves	$ 50
Claims Reported | claim	16,597
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	$ 332	323	305	280	233	170	101	55	13
General liability | 2013
Claims Development [Line Items]
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	508	505	502	488	484	456	442	455
IBNR Reserves	$ 62
Claims Reported | claim	13,867
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	$ 422	398	372	320	233	141	53	13
General liability | 2014
Claims Development [Line Items]
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	515	522	513	494	481	475	506
IBNR Reserves	$ 78
Claims Reported | claim	14,722
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	$ 402	358	304	214	130	42	15
General liability | 2015
Claims Development [Line Items]
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	647	633	594	554	560	556
IBNR Reserves	$ 110
Claims Reported | claim	15,382
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	$ 477	409	278	156	55	10
General liability | 2016
Claims Development [Line Items]
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	632	633	607	583	613
IBNR Reserves	$ 176
Claims Reported | claim	16,479
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	$ 368	283	131	52	12
General liability | 2017
Claims Development [Line Items]
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	616	613	614	626
IBNR Reserves	$ 258
Claims Reported | claim	15,943
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	$ 255	156	67	15
General liability | 2018
Claims Development [Line Items]
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	697	669	692
IBNR Reserves	$ 395
Claims Reported | claim	16,881
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	$ 177	83	21
General liability | 2019
Claims Development [Line Items]
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	826	821
IBNR Reserves	$ 638
Claims Reported | claim	15,191
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	$ 100	29
General liability | 2020
Claims Development [Line Items]
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	937
IBNR Reserves	$ 850
Claims Reported | claim	9,265
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	$ 45
Marine [Member]
Claims Development [Line Items]
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	1,379
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	1,128
Marine [Member] | 2012
Claims Development [Line Items]
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	164	164	168	164	163	169	180	220	195
IBNR Reserves	$ 2
Claims Reported | claim	6,782
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	$ 158	159	155	152	148	139	125	101	51
Marine [Member] | 2013
Claims Development [Line Items]
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	140	138	135	140	136	134	152	149
IBNR Reserves	$ (3)
Claims Reported | claim	6,623
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	$ 133	126	121	119	112	100	82	42
Marine [Member] | 2014
Claims Development [Line Items]
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	167	169	164	165	158	160	163
IBNR Reserves	$ (3)
Claims Reported | claim	7,122
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	$ 159	156	151	131	116	81	41
Marine [Member] | 2015
Claims Development [Line Items]
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	138	133	148	146	146	158
IBNR Reserves	$ (5)
Claims Reported | claim	10,114
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	$ 139	134	126	116	85	40
Marine [Member] | 2016
Claims Development [Line Items]
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	150	148	138	143	140
IBNR Reserves	$ (7)
Claims Reported | claim	13,112
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	$ 132	122	106	80	35
Marine [Member] | 2017
Claims Development [Line Items]
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	174	175	187	160
IBNR Reserves	$ (12)
Claims Reported | claim	15,498
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	$ 154	142	111	48
Marine [Member] | 2018
Claims Development [Line Items]
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	154	161	144
IBNR Reserves	$ (12)
Claims Reported | claim	13,808
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	$ 138	104	37
Marine [Member] | 2019
Claims Development [Line Items]
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	142	144
IBNR Reserves	$ 20
Claims Reported | claim	7,989
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	$ 83	36
Marine [Member] | 2020
Claims Development [Line Items]
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	150
IBNR Reserves	$ 76
Claims Reported | claim	3,451
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	$ 32
Package business
Claims Development [Line Items]
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	5,248
Package business | 2011
Claims Development [Line Items]
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	807	807	812	813	814	808	800	790	792	810
IBNR Reserves	$ 24
Claims Reported | claim	61,097
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	$ 776	774	772	762	748	727	684	621	555	377
Package business | 2012
Claims Development [Line Items]
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	732	732	739	735	736	731	728	725	736
IBNR Reserves	$ 30
Claims Reported | claim	59,871
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	$ 697	694	687	673	652	616	560	486	286
Package business | 2013
Claims Development [Line Items]
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	587	586	592	586	585	573	565	579
IBNR Reserves	$ 29
Claims Reported | claim	43,620
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	$ 549	541	522	504	467	414	339	225
Package business | 2014
Claims Development [Line Items]
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	593	603	603	602	601	578	566
IBNR Reserves	$ 44
Claims Reported | claim	43,207
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	$ 535	525	507	468	416	345	226
Package business | 2015
Claims Development [Line Items]
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	581	588	583	585	588	582
IBNR Reserves	$ 56
Claims Reported | claim	42,121
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	$ 505	486	445	383	332	212
Package business | 2016
Claims Development [Line Items]
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	611	625	632	638	655
IBNR Reserves	$ 78
Claims Reported | claim	43,922
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	$ 500	465	410	353	225
Package business | 2017
Claims Development [Line Items]
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	657	692	702	695
IBNR Reserves	$ 114
Claims Reported | claim	46,366
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	$ 496	447	372	235
Package business | 2018
Claims Development [Line Items]
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	688	724	719
IBNR Reserves	$ 169
Claims Reported | claim	44,273
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	$ 451	402	237
Package business | 2019
Claims Development [Line Items]
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	769	813
IBNR Reserves	$ 256
Claims Reported | claim	41,800
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	$ 413	254
Package business | 2020
Claims Development [Line Items]
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	915
IBNR Reserves	$ 412
Claims Reported | claim	56,548
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	$ 326
Property | P&C Commercial Lines
Claims Development [Line Items]
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	2,936
Property | P&C Commercial Lines | 2012
Claims Development [Line Items]
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	332	333	334	335	337	335	334	333	369
IBNR Reserves	$ 0
Claims Reported | claim	26,860
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	$ 330	330	331	331	331	326	317	296	182
Property | P&C Commercial Lines | 2013
Claims Development [Line Items]
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	247	247	248	249	252	254	252	268
IBNR Reserves	$ 0
Claims Reported | claim	21,610
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	$ 245	245	244	242	243	238	223	161
Property | P&C Commercial Lines | 2014
Claims Development [Line Items]
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	280	280	279	280	282	281	293
IBNR Reserves	$ 0
Claims Reported | claim	21,025
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	$ 280	279	279	279	270	250	170
Property | P&C Commercial Lines | 2015
Claims Development [Line Items]
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	304	305	301	302	301	299
IBNR Reserves	$ 1
Claims Reported | claim	21,020
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	$ 303	302	296	285	257	179
Property | P&C Commercial Lines | 2016
Claims Development [Line Items]
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	408	406	399	420	406
IBNR Reserves	$ 1
Claims Reported | claim	23,758
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	$ 401	396	378	342	215
Property | P&C Commercial Lines | 2017
Claims Development [Line Items]
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	438	455	516	577
IBNR Reserves	$ 6
Claims Reported | claim	24,332
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	$ 428	412	379	229
Property | P&C Commercial Lines | 2018
Claims Development [Line Items]
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	424	437	450
IBNR Reserves	$ 26
Claims Reported | claim	21,630
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	$ 379	344	188
Property | P&C Commercial Lines | 2019
Claims Development [Line Items]
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	437	476
IBNR Reserves	$ 21
Claims Reported | claim	20,791
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	$ 349	214
Property | P&C Commercial Lines | 2020
Claims Development [Line Items]
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	495
IBNR Reserves	$ 162
Claims Reported | claim	18,628
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	$ 221
Automobile liability | P&C Commercial Lines
Claims Development [Line Items]
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	2,775
Automobile liability | P&C Commercial Lines | 2011
Claims Development [Line Items]
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	363	363	362	363	365	366	356	356	310	272
IBNR Reserves	$ 6
Claims Reported | claim	39,302
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	$ 355	354	353	348	339	316	274	211	133	63
Automobile liability | P&C Commercial Lines | 2012
Claims Development [Line Items]
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	388	388	387	389	395	402	391	377	311
IBNR Reserves	$ 6
Claims Reported | claim	36,052
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	$ 378	376	372	359	346	307	234	143	65
Automobile liability | P&C Commercial Lines | 2013
Claims Development [Line Items]
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	334	335	339	340	341	334	318	311
IBNR Reserves	$ 8
Claims Reported | claim	32,239
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	$ 323	321	311	295	259	202	130	62
Automobile liability | P&C Commercial Lines | 2014
Claims Development [Line Items]
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	333	334	341	337	331	317	309
IBNR Reserves	$ 8
Claims Reported | claim	29,609
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	$ 318	309	299	252	197	131	59
Automobile liability | P&C Commercial Lines | 2015
Claims Development [Line Items]
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	359	356	356	372	358	308
IBNR Reserves	$ 12
Claims Reported | claim	28,541
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	$ 335	314	267	207	142	62
Automobile liability | P&C Commercial Lines | 2016
Claims Development [Line Items]
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	392	391	390	393	385
IBNR Reserves	$ 25
Claims Reported | claim	29,145
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	$ 339	303	232	147	65
Automobile liability | P&C Commercial Lines | 2017
Claims Development [Line Items]
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	383	379	383	372
IBNR Reserves	$ 37
Claims Reported | claim	26,279
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	$ 285	211	134	60
Automobile liability | P&C Commercial Lines | 2018
Claims Development [Line Items]
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	405	396	349
IBNR Reserves	$ 86
Claims Reported | claim	24,402
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	$ 239	153	62
Automobile liability | P&C Commercial Lines | 2019
Claims Development [Line Items]
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	431	417
IBNR Reserves	$ 194
Claims Reported | claim	24,604
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	$ 153	63
Automobile liability | P&C Commercial Lines | 2020
Claims Development [Line Items]
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	416
IBNR Reserves	$ 321
Claims Reported | claim	14,930
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	$ 50
Automobile liability | P&C Personal Lines
Claims Development [Line Items]
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	10,153
Automobile liability | P&C Personal Lines | 2011
Claims Development [Line Items]
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	1,153	1,153	1,153	1,154	1,154	1,166	1,173	1,180	1,170	1,181
IBNR Reserves	$ 4
Claims Reported | claim	221,891
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	$ 1,148	1,146	1,146	1,145	1,140	1,126	1,088	1,006	826	447
Automobile liability | P&C Personal Lines | 2012
Claims Development [Line Items]
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	1,129	1,130	1,130	1,130	1,133	1,142	1,146	1,149	1,141
IBNR Reserves	$ 5
Claims Reported | claim	210,757
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	$ 1,123	1,122	1,120	1,114	1,104	1,067	986	818	441
Automobile liability | P&C Personal Lines | 2013
Claims Development [Line Items]
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	1,156	1,157	1,153	1,152	1,153	1,144	1,145	1,131
IBNR Reserves	$ 7
Claims Reported | claim	205,480
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	$ 1,144	1,142	1,135	1,121	1,091	1,002	816	442
Automobile liability | P&C Personal Lines | 2014
Claims Development [Line Items]
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	1,201	1,202	1,199	1,200	1,198	1,153	1,146
IBNR Reserves	$ 8
Claims Reported | claim	209,013
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	$ 1,186	1,182	1,165	1,125	1,032	843	430
Automobile liability | P&C Personal Lines | 2015
Claims Development [Line Items]
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	1,328	1,331	1,330	1,338	1,340	1,195
IBNR Reserves	$ 15
Claims Reported | claim	216,871
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	$ 1,304	1,292	1,243	1,142	935	475
Automobile liability | P&C Personal Lines | 2016
Claims Development [Line Items]
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	1,395	1,397	1,393	1,402	1,407
IBNR Reserves	$ 28
Claims Reported | claim	215,797
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	$ 1,345	1,308	1,188	968	505
Automobile liability | P&C Personal Lines | 2017
Claims Development [Line Items]
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	1,214	1,228	1,275	1,277
IBNR Reserves	$ 50
Claims Reported | claim	187,408
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	$ 1,123	1,033	836	441
Automobile liability | P&C Personal Lines | 2018
Claims Development [Line Items]
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	1,072	1,104	1,108
IBNR Reserves	$ 105
Claims Reported | claim	155,821
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	$ 888	710	359
Automobile liability | P&C Personal Lines | 2019
Claims Development [Line Items]
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	1,010	1,018
IBNR Reserves	$ 220
Claims Reported | claim	138,430
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	$ 654	323
Automobile liability | P&C Personal Lines | 2020
Claims Development [Line Items]
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	805
IBNR Reserves	$ 400
Claims Reported | claim	90,933
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	$ 238
Commercial automobile physical damage
Claims Development [Line Items]
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	167
Commercial automobile physical damage | 2018
Claims Development [Line Items]
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	61	62	62
IBNR Reserves	$ 1
Claims Reported | claim	20,561
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	$ 60	60	54
Commercial automobile physical damage | 2019
Claims Development [Line Items]
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	64	63
IBNR Reserves	$ 1
Claims Reported | claim	19,828
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	$ 62	56
Commercial automobile physical damage | 2020
Claims Development [Line Items]
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	51
IBNR Reserves	$ 2
Claims Reported | claim	13,796
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	$ 45
Professional liability
Claims Development [Line Items]
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	1,080
Professional liability | 2012
Claims Development [Line Items]
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	217	225	219	221	221	218	238	238	242
IBNR Reserves	$ 11
Claims Reported | claim	7,036
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	$ 175	175	172	168	155	139	100	67	17
Professional liability | 2013
Claims Development [Line Items]
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	171	171	173	174	174	187	195	207
IBNR Reserves	$ 22
Claims Reported | claim	5,972
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	$ 143	137	131	116	88	67	44	10
Professional liability | 2014
Claims Development [Line Items]
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	183	182	179	178	181	183	187
IBNR Reserves	$ 26
Claims Reported | claim	6,717
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	$ 146	135	131	108	74	38	8
Professional liability | 2015
Claims Development [Line Items]
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	207	214	190	179	174	164
IBNR Reserves	$ 40
Claims Reported | claim	7,215
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	$ 141	125	107	85	40	9
Professional liability | 2016
Claims Development [Line Items]
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	196	197	203	176	183
IBNR Reserves	$ 53
Claims Reported | claim	8,345
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	$ 125	112	88	51	8
Professional liability | 2017
Claims Development [Line Items]
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	226	232	203	205
IBNR Reserves	$ 63
Claims Reported | claim	9,362
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	$ 123	88	48	11
Professional liability | 2018
Claims Development [Line Items]
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	277	281	248
IBNR Reserves	$ 101
Claims Reported | claim	9,913
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	$ 130	73	15
Professional liability | 2019
Claims Development [Line Items]
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	317	298
IBNR Reserves	$ 196
Claims Reported | claim	9,297
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	$ 78	21
Professional liability | 2020
Claims Development [Line Items]
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	370
IBNR Reserves	$ 325
Claims Reported | claim	6,236
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	$ 19
Bond
Claims Development [Line Items]
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	310
Bond | 2011
Claims Development [Line Items]
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	71	72	71	71	71	71	76	78	78	74
IBNR Reserves	$ 9
Claims Reported | claim	2,135
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	$ 62	61	60	60	60	58	57	52	40	12
Bond | 2012
Claims Development [Line Items]
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	48	48	45	49	49	55	61	70	71
IBNR Reserves	$ 13
Claims Reported | claim	1,728
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	$ 35	35	34	26	26	24	26	25	12
Bond | 2013
Claims Development [Line Items]
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	34	35	39	49	48	55	58	64
IBNR Reserves	$ 14
Claims Reported | claim	1,463
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	$ 20	20	19	19	19	17	9	3
Bond | 2014
Claims Development [Line Items]
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	60	59	59	67	66	67	71
IBNR Reserves	$ 13
Claims Reported | claim	1,386
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	$ 46	45	43	43	40	31	18
Bond | 2015
Claims Development [Line Items]
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	48	54	60	63	67	67
IBNR Reserves	$ 17
Claims Reported | claim	1,394
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	$ 32	34	31	24	20	9
Bond | 2016
Claims Development [Line Items]
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	52	56	61	61	61
IBNR Reserves	$ 29
Claims Reported | claim	1,335
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	$ 22	20	15	12	2
Bond | 2017
Claims Development [Line Items]
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	94	101	90	63
IBNR Reserves	$ 34
Claims Reported | claim	1,682
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	$ 53	55	46	5
Bond | 2018
Claims Development [Line Items]
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	72	68	68
IBNR Reserves	$ 37
Claims Reported | claim	1,573
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	$ 23	16	6
Bond | 2019
Claims Development [Line Items]
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	73	72
IBNR Reserves	$ 60
Claims Reported | claim	1,514
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	$ 13	3
Bond | 2020
Claims Development [Line Items]
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	83
IBNR Reserves	$ 77
Claims Reported | claim	1,505
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	$ 4
Assumed Reinsurance [Member]
Claims Development [Line Items]
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	1,198
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	986
Assumed Reinsurance [Member] | 2012
Claims Development [Line Items]
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	120	120	119	120	115	88	93	99	107
IBNR Reserves	$ 0
Claims Reported | claim	1,441
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	$ 119	119	118	118	112	85	83	77	38
Assumed Reinsurance [Member] | 2013
Claims Development [Line Items]
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	104	103	102	102	105	103	119	115
IBNR Reserves	$ 0
Claims Reported | claim	1,647
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	$ 103	103	101	100	98	91	83	53
Assumed Reinsurance [Member] | 2014
Claims Development [Line Items]
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	116	116	115	118	122	142	119
IBNR Reserves	$ 0
Claims Reported | claim	1,760
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	$ 114	113	112	109	106	119	66
Assumed Reinsurance [Member] | 2015
Claims Development [Line Items]
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	96	95	94	94	92	102
IBNR Reserves	$ 0
Claims Reported | claim	1,497
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	$ 94	91	83	77	65	42
Assumed Reinsurance [Member] | 2016
Claims Development [Line Items]
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	102	100	98	91	89
IBNR Reserves	$ (1)
Claims Reported | claim	1,626
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	$ 95	90	84	66	36
Assumed Reinsurance [Member] | 2017
Claims Development [Line Items]
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	157	162	153	129
IBNR Reserves	$ 0
Claims Reported | claim	1,966
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	$ 145	135	116	44
Assumed Reinsurance [Member] | 2018
Claims Development [Line Items]
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	130	128	129
IBNR Reserves	$ (14)
Claims Reported | claim	1,960
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	$ 134	112	25
Assumed Reinsurance [Member] | 2019
Claims Development [Line Items]
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	190	181
IBNR Reserves	$ 38
Claims Reported | claim	2,025
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	$ 132	62
Assumed Reinsurance [Member] | 2020
Claims Development [Line Items]
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	183
IBNR Reserves	$ 110
Claims Reported | claim	833
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	$ 50
Personal automobile physical damage
Claims Development [Line Items]
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	1,262
Personal automobile physical damage | 2018
Claims Development [Line Items]
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	488	498	509
IBNR Reserves	$ 1
Claims Reported | claim	305,389
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	$ 488	491	474
Personal automobile physical damage | 2019
Claims Development [Line Items]
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	442	445
IBNR Reserves	$ 0
Claims Reported | claim	276,688
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	$ 441	427
Personal automobile physical damage | 2020
Claims Development [Line Items]
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	349
IBNR Reserves	$ 6
Claims Reported | claim	199,623
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	$ 333
Homeowners
Claims Development [Line Items]
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	6,435
Homeowners | 2011
Claims Development [Line Items]
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	907	907	907	908	911	914	916	919	920	955
IBNR Reserves	$ 0
Claims Reported | claim	179,405
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	$ 907	908	907	908	905	903	899	891	871	$ 709
Homeowners | 2012
Claims Development [Line Items]
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	737	738	738	738	739	741	741	741	774
IBNR Reserves	$ 0
Claims Reported | claim	142,855
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	$ 736	736	735	734	731	727	719	696	$ 547
Homeowners | 2013
Claims Development [Line Items]
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	630	629	630	632	634	637	638	673
IBNR Reserves	$ 1
Claims Reported | claim	113,546
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	$ 628	628	627	626	622	611	590	$ 467
Homeowners | 2014
Claims Development [Line Items]
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	698	698	698	700	702	707	710
IBNR Reserves	$ 0
Claims Reported | claim	121,914
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	$ 697	697	695	691	684	663	$ 526
Homeowners | 2015
Claims Development [Line Items]
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	684	684	684	690	703	690
IBNR Reserves	$ 1
Claims Reported | claim	119,981
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	$ 681	680	674	665	645	$ 487
Homeowners | 2016
Claims Development [Line Items]
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	658	658	663	673	669
IBNR Reserves	$ 2
Claims Reported | claim	119,742
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	$ 653	649	640	621	$ 481
Homeowners | 2017
Claims Development [Line Items]
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	783	884	889	866
IBNR Reserves	$ 6
Claims Reported | claim	124,581
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	$ 757	795	747	$ 538
Homeowners | 2018
Claims Development [Line Items]
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	673	910	903
IBNR Reserves	$ (11)
Claims Reported | claim	102,603
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	$ 616	712	$ 484
Homeowners | 2019
Claims Development [Line Items]
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	475	501
IBNR Reserves	$ 27
Claims Reported | claim	83,915
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	$ 425	$ 318
Homeowners | 2020
Claims Development [Line Items]
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	525
IBNR Reserves	$ 89
Claims Reported | claim	82,246
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	$ 335

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