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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, 2018 USD ($) claim	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)	Dec. 31, 2012 USD ($)	Dec. 31, 2011 USD ($)	Dec. 31, 2010 USD ($)	Dec. 31, 2009 USD ($)
Workers’ compensation
Claims Development [Line Items]
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	$ 18,685
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	10,965
Workers’ compensation | 2009
Claims Development [Line Items]
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	1,534	$ 1,522	$ 1,529	$ 1,519	$ 1,504	$ 1,504	$ 1,493	$ 1,478	$ 1,455	$ 1,462
IBNR Reserves	$ 168
Claims Reported | claim	135,804
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	$ 1,263	1,242	1,208	1,170	1,115	1,042	937	792	587	265
Workers’ compensation | 2010
Claims Development [Line Items]
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	1,892	1,878	1,881	1,882	1,857	1,858	1,814	1,775	1,560
IBNR Reserves	$ 236
Claims Reported | claim	156,747
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	$ 1,522	1,489	1,439	1,374	1,287	1,154	970	709	316
Workers’ compensation | 2011
Claims Development [Line Items]
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	2,242	2,232	2,224	2,221	2,206	2,204	2,099	2,013
IBNR Reserves	$ 342
Claims Reported | claim	177,819
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	$ 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	2,154	2,169	2,168	2,181	2,207	2,207	2,185
IBNR Reserves	$ 385
Claims Reported | claim	171,219
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	$ 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	1,861	1,861	1,883	1,920	1,981	2,020
IBNR Reserves	$ 451
Claims Reported | claim	151,153
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	$ 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	1,713	1,761	1,789	1,838	1,869
IBNR Reserves	$ 532
Claims Reported | claim	125,840
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	$ 1,041	960	811	598	275
Workers’ compensation | 2015
Claims Development [Line Items]
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	1,724	1,801	1,835	1,873
IBNR Reserves	$ 613
Claims Reported | claim	113,493
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	$ 909	778	576	261
Workers’ compensation | 2016
Claims Development [Line Items]
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	1,780	1,772	1,772
IBNR Reserves	$ 787
Claims Reported | claim	111,190
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	$ 779	579	255
Workers’ compensation | 2017
Claims Development [Line Items]
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	1,869	1,862
IBNR Reserves	$ 1,061
Claims Reported | claim	109,982
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	$ 575	261
Workers’ compensation | 2018
Claims Development [Line Items]
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	1,916
IBNR Reserves	$ 1,363
Claims Reported | claim	109,842
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	$ 283
General liability
Claims Development [Line Items]
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	3,605
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	1,840
General liability | 2009
Claims Development [Line Items]
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	351	341	346	347	348	359	382	394	398	382
IBNR Reserves	$ 39
Claims Reported | claim	20,714
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	$ 304	297	287	277	256	227	181	124	63	22
General liability | 2010
Claims Development [Line Items]
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	393	377	376	345	343	355	352	362	355
IBNR Reserves	$ 46
Claims Reported | claim	18,949
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	$ 337	331	314	259	224	181	115	51	14
General liability | 2011
Claims Development [Line Items]
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	326	318	320	315	316	323	343	353
IBNR Reserves	$ 52
Claims Reported | claim	16,854
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	$ 264	252	234	198	154	93	47	11
General liability | 2012
Claims Development [Line Items]
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	304	298	304	295	310	315	321
IBNR Reserves	$ 69
Claims Reported | claim	11,761
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	$ 215	198	167	124	75	39	8
General liability | 2013
Claims Development [Line Items]
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	352	344	352	332	321	318
IBNR Reserves	$ 80
Claims Reported | claim	9,906
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	$ 242	207	152	95	35	7
General liability | 2014
Claims Development [Line Items]
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	351	342	336	318	317
IBNR Reserves	$ 112
Claims Reported | claim	10,358
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	$ 195	142	88	31	11
General liability | 2015
Claims Development [Line Items]
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	364	345	346	316
IBNR Reserves	$ 164
Claims Reported | claim	10,805
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	$ 139	80	32	7
General liability | 2016
Claims Development [Line Items]
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	380	351	352
IBNR Reserves	$ 241
Claims Reported | claim	11,960
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	$ 79	32	8
General liability | 2017
Claims Development [Line Items]
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	385	363
IBNR Reserves	$ 289
Claims Reported | claim	10,965
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	$ 48	12
General liability | 2018
Claims Development [Line Items]
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	399
IBNR Reserves	$ 352
Claims Reported | claim	10,023
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	$ 17
Package business
Claims Development [Line Items]
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	6,600
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	5,128
Package business | 2009
Claims Development [Line Items]
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	569	574	576	576	577	578	572	584	584	587
IBNR Reserves	$ 15
Claims Reported | claim	50,413
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	$ 551	550	547	539	527	503	463	411	351	227
Package business | 2010
Claims Development [Line Items]
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	649	651	653	651	652	652	654	662	657
IBNR Reserves	$ 19
Claims Reported | claim	52,410
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	$ 625	618	613	601	570	539	487	414	270
Package business | 2011
Claims Development [Line Items]
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	812	813	814	808	800	790	792	810
IBNR Reserves	$ 31
Claims Reported | claim	60,967
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	$ 772	762	748	727	684	621	555	377
Package business | 2012
Claims Development [Line Items]
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	739	735	736	731	728	725	736
IBNR Reserves	$ 39
Claims Reported | claim	59,715
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	$ 687	673	652	616	560	486	286
Package business | 2013
Claims Development [Line Items]
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	592	586	585	573	565	579
IBNR Reserves	$ 46
Claims Reported | claim	43,415
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	$ 522	504	467	414	339	225
Package business | 2014
Claims Development [Line Items]
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	603	602	601	578	566
IBNR Reserves	$ 70
Claims Reported | claim	42,928
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	$ 507	468	416	345	226
Package business | 2015
Claims Development [Line Items]
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	583	585	588	582
IBNR Reserves	$ 94
Claims Reported | claim	41,678
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	$ 445	383	332	212
Package business | 2016
Claims Development [Line Items]
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	632	638	655
IBNR Reserves	$ 170
Claims Reported | claim	43,129
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	$ 410	353	225
Package business | 2017
Claims Development [Line Items]
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	702	695
IBNR Reserves	$ 257
Claims Reported | claim	44,709
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	$ 372	235
Package business | 2018
Claims Development [Line Items]
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	719
IBNR Reserves	$ 335
Claims Reported | claim	38,034
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	$ 237
Property | Property and Casualty, Commercial Insurance Product Line [Member]
Claims Development [Line Items]
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	3,124
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	2,763
Property | Property and Casualty, Commercial Insurance Product Line [Member] | 2009
Claims Development [Line Items]
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	258	257	257	257	257	251	258	259	264	267
IBNR Reserves	$ 0
Claims Reported | claim	28,286
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	$ 257	257	257	257	257	256	256	252	247	179
Property | Property and Casualty, Commercial Insurance Product Line [Member] | 2010
Claims Development [Line Items]
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	284	284	284	284	284	282	279	283	286
IBNR Reserves	$ 0
Claims Reported | claim	28,515
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	$ 284	284	284	284	283	281	276	266	198
Property | Property and Casualty, Commercial Insurance Product Line [Member] | 2011
Claims Development [Line Items]
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	359	359	360	361	362	356	356	357
IBNR Reserves	$ 0
Claims Reported | claim	29,110
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	$ 360	360	359	358	355	350	332	231
Property | Property and Casualty, Commercial Insurance Product Line [Member] | 2012
Claims Development [Line Items]
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	305	305	306	305	301	301	329
IBNR Reserves	$ 1
Claims Reported | claim	25,789
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	$ 303	303	304	300	294	279	171
Property | Property and Casualty, Commercial Insurance Product Line [Member] | 2013
Claims Development [Line Items]
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	215	216	220	219	218	234
IBNR Reserves	$ 0
Claims Reported | claim	20,289
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	$ 215	215	218	216	208	157
Property | Property and Casualty, Commercial Insurance Product Line [Member] | 2014
Claims Development [Line Items]
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	263	264	262	260	268
IBNR Reserves	$ 0
Claims Reported | claim	19,758
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	$ 262	264	258	243	168
Property | Property and Casualty, Commercial Insurance Product Line [Member] | 2015
Claims Development [Line Items]
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	270	268	264	264
IBNR Reserves	$ 0
Claims Reported | claim	19,061
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	$ 265	255	239	172
Property | Property and Casualty, Commercial Insurance Product Line [Member] | 2016
Claims Development [Line Items]
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	327	331	328
IBNR Reserves	$ 5
Claims Reported | claim	19,945
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	$ 310	285	188
Property | Property and Casualty, Commercial Insurance Product Line [Member] | 2017
Claims Development [Line Items]
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	440	515
IBNR Reserves	$ 62
Claims Reported | claim	20,703
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	$ 334	210
Property | Property and Casualty, Commercial Insurance Product Line [Member] | 2018
Claims Development [Line Items]
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	403
IBNR Reserves	$ 86
Claims Reported | claim	17,839
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	$ 173
Automobile liability | Property and Casualty, Commercial Insurance Product Line [Member]
Claims Development [Line Items]
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	3,442
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	2,604
Automobile liability | Property and Casualty, Commercial Insurance Product Line [Member] | 2009
Claims Development [Line Items]
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	302	302	302	302	301	297	287	287	292	306
IBNR Reserves	$ 0
Claims Reported | claim	38,703
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	$ 301	301	300	298	291	274	237	175	115	56
Automobile liability | Property and Casualty, Commercial Insurance Product Line [Member] | 2010
Claims Development [Line Items]
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	322	324	327	328	323	319	296	280	277
IBNR Reserves	$ 4
Claims Reported | claim	38,153
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	$ 316	313	308	300	289	252	188	125	55
Automobile liability | Property and Casualty, Commercial Insurance Product Line [Member] | 2011
Claims Development [Line Items]
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	362	362	365	366	356	356	310	272
IBNR Reserves	$ 4
Claims Reported | claim	39,293
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	$ 352	348	339	315	273	211	133	62
Automobile liability | Property and Casualty, Commercial Insurance Product Line [Member] | 2012
Claims Development [Line Items]
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	387	390	394	401	390	376	311
IBNR Reserves	$ 6
Claims Reported | claim	35,999
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	$ 371	358	345	306	233	142	65
Automobile liability | Property and Casualty, Commercial Insurance Product Line [Member] | 2013
Claims Development [Line Items]
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	333	335	336	329	314	309
IBNR Reserves	$ 18
Claims Reported | claim	31,918
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	$ 306	289	255	199	128	61
Automobile liability | Property and Casualty, Commercial Insurance Product Line [Member] | 2014
Claims Development [Line Items]
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	337	333	328	314	306
IBNR Reserves	$ 23
Claims Reported | claim	29,260
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	$ 295	249	195	129	58
Automobile liability | Property and Casualty, Commercial Insurance Product Line [Member] | 2015
Claims Development [Line Items]
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	351	368	353	302
IBNR Reserves	$ 43
Claims Reported | claim	28,079
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	$ 264	204	141	61
Automobile liability | Property and Casualty, Commercial Insurance Product Line [Member] | 2016
Claims Development [Line Items]
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	376	380	372
IBNR Reserves	$ 90
Claims Reported | claim	28,154
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	$ 222	140	62
Automobile liability | Property and Casualty, Commercial Insurance Product Line [Member] | 2017
Claims Development [Line Items]
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	358	346
IBNR Reserves	$ 165
Claims Reported | claim	24,587
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	$ 123	55
Automobile liability | Property and Casualty, Commercial Insurance Product Line [Member] | 2018
Claims Development [Line Items]
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	314
IBNR Reserves	$ 205
Claims Reported | claim	20,675
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	$ 54
Automobile liability | Property and Casualty, Personal Insurance Product Line [Member]
Claims Development [Line Items]
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	12,262
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	10,703
Automobile liability | Property and Casualty, Personal Insurance Product Line [Member] | 2009
Claims Development [Line Items]
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	1,257	1,257	1,257	1,259	1,260	1,256	1,255	1,280	1,305	1,351
IBNR Reserves	$ 3
Claims Reported | claim	254,555
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	$ 1,251	1,251	1,250	1,246	1,240	1,223	1,171	1,083	888	492
Automobile liability | Property and Casualty, Personal Insurance Product Line [Member] | 2010
Claims Development [Line Items]
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	1,264	1,265	1,265	1,275	1,282	1,287	1,293	1,321	1,346
IBNR Reserves	$ 3
Claims Reported | claim	248,944
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	$ 1,260	1,258	1,256	1,251	1,239	1,202	1,108	915	496
Automobile liability | Property and Casualty, Personal Insurance Product Line [Member] | 2011
Claims Development [Line Items]
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	1,153	1,154	1,154	1,166	1,173	1,180	1,170	1,181
IBNR Reserves	$ 5
Claims Reported | claim	221,886
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	$ 1,146	1,145	1,140	1,126	1,088	1,006	826	447
Automobile liability | Property and Casualty, Personal Insurance Product Line [Member] | 2012
Claims Development [Line Items]
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	1,130	1,130	1,133	1,142	1,146	1,149	1,141
IBNR Reserves	$ 7
Claims Reported | claim	210,750
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	$ 1,120	1,114	1,104	1,067	986	818	441
Automobile liability | Property and Casualty, Personal Insurance Product Line [Member] | 2013
Claims Development [Line Items]
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	1,153	1,152	1,153	1,144	1,145	1,131
IBNR Reserves	$ 8
Claims Reported | claim	205,462
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	$ 1,135	1,121	1,091	1,002	816	442
Automobile liability | Property and Casualty, Personal Insurance Product Line [Member] | 2014
Claims Development [Line Items]
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	1,199	1,200	1,198	1,153	1,146
IBNR Reserves	$ 15
Claims Reported | claim	208,942
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	$ 1,165	1,125	1,032	843	430
Automobile liability | Property and Casualty, Personal Insurance Product Line [Member] | 2015
Claims Development [Line Items]
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	1,330	1,338	1,340	1,195
IBNR Reserves	$ 38
Claims Reported | claim	216,707
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	$ 1,243	1,142	935	475
Automobile liability | Property and Casualty, Personal Insurance Product Line [Member] | 2016
Claims Development [Line Items]
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	1,393	1,402	1,407
IBNR Reserves	$ 103
Claims Reported | claim	215,126
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	$ 1,188	968	505
Automobile liability | Property and Casualty, Personal Insurance Product Line [Member] | 2017
Claims Development [Line Items]
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	1,275	1,277
IBNR Reserves	$ 276
Claims Reported | claim	185,716
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	$ 836	441
Automobile liability | Property and Casualty, Personal Insurance Product Line [Member] | 2018
Claims Development [Line Items]
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	1,108
IBNR Reserves	$ 510
Claims Reported | claim	146,845
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	$ 359
Commercial automobile physical damage
Claims Development [Line Items]
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	221
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	210
Commercial automobile physical damage | 2016
Claims Development [Line Items]
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	78	78	79
IBNR Reserves	$ 0
Claims Reported | claim	26,367
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	$ 77	78	71
Commercial automobile physical damage | 2017
Claims Development [Line Items]
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	81	85
IBNR Reserves	$ 3
Claims Reported | claim	24,275
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	$ 79	74
Commercial automobile physical damage | 2018
Claims Development [Line Items]
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	62
IBNR Reserves	$ 2
Claims Reported | claim	19,167
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	$ 54
Professional liability
Claims Development [Line Items]
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	1,491
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	973
Professional liability | 2009
Claims Development [Line Items]
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	259	257	257	255	263	257	266	244	251	254
IBNR Reserves	$ 20
Claims Reported | claim	5,115
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	$ 238	235	226	225	226	194	177	127	69	17
Professional liability | 2010
Claims Development [Line Items]
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	192	199	195	200	201	205	212	211	202
IBNR Reserves	$ 22
Claims Reported | claim	4,894
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	$ 169	166	162	157	148	137	103	62	22
Professional liability | 2011
Claims Development [Line Items]
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	215	220	219	219	226	232	228	226
IBNR Reserves	$ 38
Claims Reported | claim	4,708
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	$ 176	173	170	163	128	100	57	11
Professional liability | 2012
Claims Development [Line Items]
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	139	144	146	149	168	172	174
IBNR Reserves	$ 18
Claims Reported | claim	3,734
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	$ 109	107	97	89	60	41	11
Professional liability | 2013
Claims Development [Line Items]
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	99	103	110	123	136	136
IBNR Reserves	$ 27
Claims Reported | claim	2,791
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	$ 66	55	39	31	19	4
Professional liability | 2014
Claims Development [Line Items]
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	109	114	118	123	116
IBNR Reserves	$ 33
Claims Reported | claim	2,891
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	$ 72	64	40	21	4
Professional liability | 2015
Claims Development [Line Items]
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	114	113	113	104
IBNR Reserves	$ 32
Claims Reported | claim	2,957
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	$ 63	49	23	4
Professional liability | 2016
Claims Development [Line Items]
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	125	106	106
IBNR Reserves	$ 71
Claims Reported | claim	3,133
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	$ 46	25	4
Professional liability | 2017
Claims Development [Line Items]
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	113	107
IBNR Reserves	$ 75
Claims Reported | claim	3,111
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	$ 26	6
Professional liability | 2018
Claims Development [Line Items]
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	126
IBNR Reserves	$ 107
Claims Reported | claim	2,971
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	$ 8
Bond
Claims Development [Line Items]
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	598
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	356
Bond | 2009
Claims Development [Line Items]
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	49	49	49	49	51	57	58	69	71	71
IBNR Reserves	$ 5
Claims Reported | claim	3,321
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	$ 43	44	44	44	43	44	46	45	32	9
Bond | 2010
Claims Development [Line Items]
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	71	90	70	69	73	79	80	75	71
IBNR Reserves	$ 3
Claims Reported | claim	2,674
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	$ 67	66	66	63	59	58	59	46	13
Bond | 2011
Claims Development [Line Items]
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	69	69	70	70	75	76	76	72
IBNR Reserves	$ 9
Claims Reported | claim	2,134
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	$ 59	59	59	57	56	51	39	12
Bond | 2012
Claims Development [Line Items]
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	43	48	48	53	60	69	69
IBNR Reserves	$ 9
Claims Reported | claim	1,720
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	$ 33	25	25	24	26	25	12
Bond | 2013
Claims Development [Line Items]
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	38	48	48	54	58	63
IBNR Reserves	$ 18
Claims Reported | claim	1,456
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	$ 18	18	18	17	9	3
Bond | 2014
Claims Development [Line Items]
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	58	66	65	65	69
IBNR Reserves	$ 13
Claims Reported | claim	1,373
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	$ 42	43	40	31	18
Bond | 2015
Claims Development [Line Items]
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	59	62	65	65
IBNR Reserves	$ 23
Claims Reported | claim	1,368
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	$ 31	23	19	9
Bond | 2016
Claims Development [Line Items]
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	58	59	59
IBNR Reserves	$ 37
Claims Reported | claim	1,272
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	$ 13	11	2
Bond | 2017
Claims Development [Line Items]
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	88	61
IBNR Reserves	$ 38
Claims Reported | claim	1,204
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	$ 45	5
Bond | 2018
Claims Development [Line Items]
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	65
IBNR Reserves	$ 59
Claims Reported | claim	1,040
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	$ 5
Personal automobile physical damage
Claims Development [Line Items]
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	1,752
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	1,716
Personal automobile physical damage | 2016
Claims Development [Line Items]
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	655	656	665
IBNR Reserves	$ 3
Claims Reported | claim	406,588
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	$ 651	653	634
Personal automobile physical damage | 2017
Claims Development [Line Items]
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	588	598
IBNR Reserves	$ (3)
Claims Reported | claim	361,857
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	$ 591	574
Personal automobile physical damage | 2018
Claims Development [Line Items]
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	509
IBNR Reserves	$ 3
Claims Reported | claim	288,993
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	$ 474
Homeowners
Claims Development [Line Items]
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	7,714
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	7,110
Homeowners | 2009
Claims Development [Line Items]
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	768	768	769	772	772	772	772	776	777	757
IBNR Reserves	$ 0
Claims Reported | claim	149,799
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	$ 767	767	766	766	765	763	759	749	727	$ 559
Homeowners | 2010
Claims Development [Line Items]
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	834	834	836	840	840	840	838	850	838
IBNR Reserves	$ 0
Claims Reported | claim	161,590
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	$ 834	833	833	832	829	825	815	789	$ 599
Homeowners | 2011
Claims Development [Line Items]
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	907	908	911	914	916	919	920	955
IBNR Reserves	$ 0
Claims Reported | claim	179,389
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	$ 907	908	905	903	899	891	871	$ 709
Homeowners | 2012
Claims Development [Line Items]
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	738	738	739	741	741	741	774
IBNR Reserves	$ 1
Claims Reported | claim	142,828
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	$ 735	734	731	727	719	696	$ 547
Homeowners | 2013
Claims Development [Line Items]
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	630	632	634	637	638	673
IBNR Reserves	$ 1
Claims Reported | claim	113,518
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	$ 627	626	622	611	590	$ 467
Homeowners | 2014
Claims Development [Line Items]
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	698	700	702	707	710
IBNR Reserves	$ 1
Claims Reported | claim	121,863
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	$ 695	691	684	663	$ 526
Homeowners | 2015
Claims Development [Line Items]
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	684	690	703	690
IBNR Reserves	$ 3
Claims Reported | claim	119,888
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	$ 674	665	645	$ 487
Homeowners | 2016
Claims Development [Line Items]
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	663	673	669
IBNR Reserves	$ 7
Claims Reported | claim	119,441
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	$ 640	621	$ 481
Homeowners | 2017
Claims Development [Line Items]
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	889	866
IBNR Reserves	$ 45
Claims Reported | claim	123,426
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	$ 747	$ 538
Homeowners | 2018
Claims Development [Line Items]
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	903
IBNR Reserves	$ 89
Claims Reported | claim	94,946
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	$ 484

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