Insurance - Short-duration insurance contracts, claims development (Details) - Property and casualty insurance $ in Millions		Dec. 31, 2019 USD ($) claim	Dec. 31, 2018 USD ($)	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 ($)	Dec. 31, 2010 USD ($)
Claims Development [Line Items]
Incurred Claims and Allocated LAE, Net of Reinsurance		$ 20,979
Cumulative Paid Claims and Allocated LAE, Net of Reinsurance		15,715
Unpaid losses and LAE — 11th year and prior (excluding unallocated LAE)		497
Unpaid losses and LAE, net of reinsurance (excluding unallocated LAE)		5,761
Accident Year 2010
Claims Development [Line Items]
Incurred Claims and Allocated LAE, Net of Reinsurance		1,666	$ 1,676	$ 1,690	$ 1,698	$ 1,698	$ 1,710	$ 1,690	$ 1,705	$ 1,710	$ 1,724
Total IBNR Plus Expected Development on Reported Claims		$ 33
Cumulative Number of Reported Claims | claim		216,746
Cumulative Paid Claims and Allocated LAE, Net of Reinsurance		$ 1,611	1,595	1,580	1,562	1,536	1,485	1,387	1,220	1,005	576
Cumulative Percentage Paid of Incurred Claims and Allocated LAE, Net of Reinsurance	[1]	96.70%
Accident Year 2011
Claims Development [Line Items]
Incurred Claims and Allocated LAE, Net of Reinsurance		$ 1,832	1,843	1,859	1,866	1,861	1,871	1,849	1,848	1,840
Total IBNR Plus Expected Development on Reported Claims		$ 43
Cumulative Number of Reported Claims | claim		209,433
Cumulative Paid Claims and Allocated LAE, Net of Reinsurance		$ 1,750	1,734	1,711	1,682	1,629	1,534	1,389	1,181	609
Cumulative Percentage Paid of Incurred Claims and Allocated LAE, Net of Reinsurance	[1]	95.50%
Accident Year 2012
Claims Development [Line Items]
Incurred Claims and Allocated LAE, Net of Reinsurance		$ 1,886	1,906	1,941	1,955	1,947	1,946	1,952	1,970
Total IBNR Plus Expected Development on Reported Claims		$ 64
Cumulative Number of Reported Claims | claim		218,880
Cumulative Paid Claims and Allocated LAE, Net of Reinsurance		$ 1,788	1,785	1,735	1,675	1,579	1,418	1,214	824
Cumulative Percentage Paid of Incurred Claims and Allocated LAE, Net of Reinsurance	[1]	94.80%
Accident Year 2013
Claims Development [Line Items]
Incurred Claims and Allocated LAE, Net of Reinsurance		$ 1,969	1,982	2,000	1,996	2,000	2,011	2,036
Total IBNR Plus Expected Development on Reported Claims		$ 94
Cumulative Number of Reported Claims | claim		222,253
Cumulative Paid Claims and Allocated LAE, Net of Reinsurance		$ 1,824	1,774	1,714	1,617	1,443	1,214	697
Cumulative Percentage Paid of Incurred Claims and Allocated LAE, Net of Reinsurance	[1]	92.60%
Accident Year 2014
Claims Development [Line Items]
Incurred Claims and Allocated LAE, Net of Reinsurance		$ 1,978	2,004	2,038	2,040	2,050	2,083
Total IBNR Plus Expected Development on Reported Claims		$ 124
Cumulative Number of Reported Claims | claim		218,852
Cumulative Paid Claims and Allocated LAE, Net of Reinsurance		$ 1,773	1,705	1,588	1,422	1,174	594
Cumulative Percentage Paid of Incurred Claims and Allocated LAE, Net of Reinsurance	[1]	89.60%
Accident Year 2015
Claims Development [Line Items]
Incurred Claims and Allocated LAE, Net of Reinsurance		$ 2,022	2,038	2,041	2,047	2,114
Total IBNR Plus Expected Development on Reported Claims		$ 162
Cumulative Number of Reported Claims | claim		229,607
Cumulative Paid Claims and Allocated LAE, Net of Reinsurance		$ 1,722	1,592	1,404	1,129	619
Cumulative Percentage Paid of Incurred Claims and Allocated LAE, Net of Reinsurance	[1]	85.20%
Accident Year 2016
Claims Development [Line Items]
Incurred Claims and Allocated LAE, Net of Reinsurance		$ 2,060	2,082	2,083	2,117
Total IBNR Plus Expected Development on Reported Claims		$ 315
Cumulative Number of Reported Claims | claim		221,938
Cumulative Paid Claims and Allocated LAE, Net of Reinsurance		$ 1,539	1,350	1,099	577
Cumulative Percentage Paid of Incurred Claims and Allocated LAE, Net of Reinsurance	[1]	74.70%
Accident Year 2017
Claims Development [Line Items]
Incurred Claims and Allocated LAE, Net of Reinsurance		$ 2,329	2,348	2,375
Total IBNR Plus Expected Development on Reported Claims		$ 502
Cumulative Number of Reported Claims | claim		244,561
Cumulative Paid Claims and Allocated LAE, Net of Reinsurance		$ 1,524	1,250	709
Cumulative Percentage Paid of Incurred Claims and Allocated LAE, Net of Reinsurance	[1]	65.40%
Accident Year 2018
Claims Development [Line Items]
Incurred Claims and Allocated LAE, Net of Reinsurance		$ 2,516	2,507
Total IBNR Plus Expected Development on Reported Claims		$ 750
Cumulative Number of Reported Claims | claim		231,707
Cumulative Paid Claims and Allocated LAE, Net of Reinsurance		$ 1,337	730
Cumulative Percentage Paid of Incurred Claims and Allocated LAE, Net of Reinsurance	[1]	53.10%
Accident Year 2019
Claims Development [Line Items]
Incurred Claims and Allocated LAE, Net of Reinsurance		$ 2,721
Total IBNR Plus Expected Development on Reported Claims		$ 1,225
Cumulative Number of Reported Claims | claim		225,075
Cumulative Paid Claims and Allocated LAE, Net of Reinsurance		$ 847
Cumulative Percentage Paid of Incurred Claims and Allocated LAE, Net of Reinsurance	[1]	31.10%
Excludes short-duration insurance contracts detail for accident years not separately presented
Claims Development [Line Items]
Unpaid losses and LAE, net of reinsurance (excluding unallocated LAE)		$ 5,264
Property and transportation
Claims Development [Line Items]
Incurred Claims and Allocated LAE, Net of Reinsurance		8,399
Cumulative Paid Claims and Allocated LAE, Net of Reinsurance		7,247
Unpaid losses and LAE — 11th year and prior (excluding unallocated LAE)		19
Unpaid losses and LAE, net of reinsurance (excluding unallocated LAE)		1,171
Property and transportation | Accident Year 2010
Claims Development [Line Items]
Incurred Claims and Allocated LAE, Net of Reinsurance		655	655	657	660	655	655	652	645	639	679
Total IBNR Plus Expected Development on Reported Claims		$ 3
Cumulative Number of Reported Claims | claim		138,105
Cumulative Paid Claims and Allocated LAE, Net of Reinsurance		$ 650	649	647	642	637	626	596	535	486	316
Cumulative Percentage Paid of Incurred Claims and Allocated LAE, Net of Reinsurance	[2]	99.20%
Property and transportation | Accident Year 2011
Claims Development [Line Items]
Incurred Claims and Allocated LAE, Net of Reinsurance		$ 843	844	846	850	837	827	813	799	811
Total IBNR Plus Expected Development on Reported Claims		$ 5
Cumulative Number of Reported Claims | claim		138,309
Cumulative Paid Claims and Allocated LAE, Net of Reinsurance		$ 834	833	829	821	803	771	727	667	365
Cumulative Percentage Paid of Incurred Claims and Allocated LAE, Net of Reinsurance	[2]	98.90%
Property and transportation | Accident Year 2012
Claims Development [Line Items]
Incurred Claims and Allocated LAE, Net of Reinsurance		$ 881	886	890	894	883	871	857	864
Total IBNR Plus Expected Development on Reported Claims		$ 8
Cumulative Number of Reported Claims | claim		143,122
Cumulative Paid Claims and Allocated LAE, Net of Reinsurance		$ 869	882	856	842	816	772	708	572
Cumulative Percentage Paid of Incurred Claims and Allocated LAE, Net of Reinsurance	[2]	98.60%
Property and transportation | Accident Year 2013
Claims Development [Line Items]
Incurred Claims and Allocated LAE, Net of Reinsurance		$ 873	877	878	878	872	870	882
Total IBNR Plus Expected Development on Reported Claims		$ 10
Cumulative Number of Reported Claims | claim		138,864
Cumulative Paid Claims and Allocated LAE, Net of Reinsurance		$ 858	847	831	804	760	702	438
Cumulative Percentage Paid of Incurred Claims and Allocated LAE, Net of Reinsurance	[2]	98.30%
Property and transportation | Accident Year 2014
Claims Development [Line Items]
Incurred Claims and Allocated LAE, Net of Reinsurance		$ 808	815	820	817	828	844
Total IBNR Plus Expected Development on Reported Claims		$ 15
Cumulative Number of Reported Claims | claim		132,971
Cumulative Paid Claims and Allocated LAE, Net of Reinsurance		$ 783	770	744	693	632	329
Cumulative Percentage Paid of Incurred Claims and Allocated LAE, Net of Reinsurance	[2]	96.90%
Property and transportation | Accident Year 2015
Claims Development [Line Items]
Incurred Claims and Allocated LAE, Net of Reinsurance		$ 777	777	779	784	818
Total IBNR Plus Expected Development on Reported Claims		$ 23
Cumulative Number of Reported Claims | claim		134,618
Cumulative Paid Claims and Allocated LAE, Net of Reinsurance		$ 736	707	667	582	359
Cumulative Percentage Paid of Incurred Claims and Allocated LAE, Net of Reinsurance	[2]	94.70%
Property and transportation | Accident Year 2016
Claims Development [Line Items]
Incurred Claims and Allocated LAE, Net of Reinsurance		$ 706	714	716	746
Total IBNR Plus Expected Development on Reported Claims		$ 46
Cumulative Number of Reported Claims | claim		120,884
Cumulative Paid Claims and Allocated LAE, Net of Reinsurance		$ 618	577	521	294
Cumulative Percentage Paid of Incurred Claims and Allocated LAE, Net of Reinsurance	[2]	87.50%
Property and transportation | Accident Year 2017
Claims Development [Line Items]
Incurred Claims and Allocated LAE, Net of Reinsurance		$ 843	847	889
Total IBNR Plus Expected Development on Reported Claims		$ 80
Cumulative Number of Reported Claims | claim		140,067
Cumulative Paid Claims and Allocated LAE, Net of Reinsurance		$ 696	640	379
Cumulative Percentage Paid of Incurred Claims and Allocated LAE, Net of Reinsurance	[2]	82.60%
Property and transportation | Accident Year 2018
Claims Development [Line Items]
Incurred Claims and Allocated LAE, Net of Reinsurance		$ 902	932
Total IBNR Plus Expected Development on Reported Claims		$ 119
Cumulative Number of Reported Claims | claim		128,428
Cumulative Paid Claims and Allocated LAE, Net of Reinsurance		$ 676	396
Cumulative Percentage Paid of Incurred Claims and Allocated LAE, Net of Reinsurance	[2]	74.90%
Property and transportation | Accident Year 2019
Claims Development [Line Items]
Incurred Claims and Allocated LAE, Net of Reinsurance		$ 1,111
Total IBNR Plus Expected Development on Reported Claims		$ 288
Cumulative Number of Reported Claims | claim		138,508
Cumulative Paid Claims and Allocated LAE, Net of Reinsurance		$ 527
Cumulative Percentage Paid of Incurred Claims and Allocated LAE, Net of Reinsurance	[2]	47.40%
Property and transportation | Excludes short-duration insurance contracts detail for accident years not separately presented
Claims Development [Line Items]
Unpaid losses and LAE, net of reinsurance (excluding unallocated LAE)		$ 1,152
Specialty casualty
Claims Development [Line Items]
Incurred Claims and Allocated LAE, Net of Reinsurance		10,325
Cumulative Paid Claims and Allocated LAE, Net of Reinsurance		6,706
Unpaid losses and LAE — 11th year and prior (excluding unallocated LAE)		437
Unpaid losses and LAE, net of reinsurance (excluding unallocated LAE)		4,056
Specialty casualty | Accident Year 2010
Claims Development [Line Items]
Incurred Claims and Allocated LAE, Net of Reinsurance		846	855	866	868	870	880	867	888	887	871
Total IBNR Plus Expected Development on Reported Claims		$ 28
Cumulative Number of Reported Claims | claim		56,716
Cumulative Paid Claims and Allocated LAE, Net of Reinsurance		$ 798	783	771	757	736	700	645	560	412	191
Cumulative Percentage Paid of Incurred Claims and Allocated LAE, Net of Reinsurance	[3]	94.30%
Specialty casualty | Accident Year 2011
Claims Development [Line Items]
Incurred Claims and Allocated LAE, Net of Reinsurance		$ 810	817	826	828	834	848	839	849	852
Total IBNR Plus Expected Development on Reported Claims		$ 37
Cumulative Number of Reported Claims | claim		54,755
Cumulative Paid Claims and Allocated LAE, Net of Reinsurance		$ 745	731	714	694	662	612	522	383	174
Cumulative Percentage Paid of Incurred Claims and Allocated LAE, Net of Reinsurance	[3]	92.00%
Specialty casualty | Accident Year 2012
Claims Development [Line Items]
Incurred Claims and Allocated LAE, Net of Reinsurance		$ 842	849	877	883	885	885	892	901
Total IBNR Plus Expected Development on Reported Claims		$ 53
Cumulative Number of Reported Claims | claim		54,682
Cumulative Paid Claims and Allocated LAE, Net of Reinsurance		$ 761	745	723	684	621	516	385	173
Cumulative Percentage Paid of Incurred Claims and Allocated LAE, Net of Reinsurance	[3]	90.40%
Specialty casualty | Accident Year 2013
Claims Development [Line Items]
Incurred Claims and Allocated LAE, Net of Reinsurance		$ 916	926	945	940	945	949	968
Total IBNR Plus Expected Development on Reported Claims		$ 77
Cumulative Number of Reported Claims | claim		54,929
Cumulative Paid Claims and Allocated LAE, Net of Reinsurance		$ 797	766	729	666	554	396	182
Cumulative Percentage Paid of Incurred Claims and Allocated LAE, Net of Reinsurance	[3]	87.00%
Specialty casualty | Accident Year 2014
Claims Development [Line Items]
Incurred Claims and Allocated LAE, Net of Reinsurance		$ 967	982	1,006	1,008	1,008	1,035
Total IBNR Plus Expected Development on Reported Claims		$ 98
Cumulative Number of Reported Claims | claim		56,445
Cumulative Paid Claims and Allocated LAE, Net of Reinsurance		$ 801	755	680	574	412	190
Cumulative Percentage Paid of Incurred Claims and Allocated LAE, Net of Reinsurance	[3]	82.80%
Specialty casualty | Accident Year 2015
Claims Development [Line Items]
Incurred Claims and Allocated LAE, Net of Reinsurance		$ 1,024	1,042	1,041	1,043	1,081
Total IBNR Plus Expected Development on Reported Claims		$ 126
Cumulative Number of Reported Claims | claim		57,427
Cumulative Paid Claims and Allocated LAE, Net of Reinsurance		$ 792	702	577	411	178
Cumulative Percentage Paid of Incurred Claims and Allocated LAE, Net of Reinsurance	[3]	77.30%
Specialty casualty | Accident Year 2016
Claims Development [Line Items]
Incurred Claims and Allocated LAE, Net of Reinsurance		$ 1,101	1,116	1,122	1,131
Total IBNR Plus Expected Development on Reported Claims		$ 236
Cumulative Number of Reported Claims | claim		56,000
Cumulative Paid Claims and Allocated LAE, Net of Reinsurance		$ 713	584	418	186
Cumulative Percentage Paid of Incurred Claims and Allocated LAE, Net of Reinsurance	[3]	64.80%
Specialty casualty | Accident Year 2017
Claims Development [Line Items]
Incurred Claims and Allocated LAE, Net of Reinsurance		$ 1,204	1,221	1,211
Total IBNR Plus Expected Development on Reported Claims		$ 372
Cumulative Number of Reported Claims | claim		56,073
Cumulative Paid Claims and Allocated LAE, Net of Reinsurance		$ 612	422	200
Cumulative Percentage Paid of Incurred Claims and Allocated LAE, Net of Reinsurance	[3]	50.80%
Specialty casualty | Accident Year 2018
Claims Development [Line Items]
Incurred Claims and Allocated LAE, Net of Reinsurance		$ 1,307	1,277
Total IBNR Plus Expected Development on Reported Claims		$ 548
Cumulative Number of Reported Claims | claim		57,081
Cumulative Paid Claims and Allocated LAE, Net of Reinsurance		$ 475	210
Cumulative Percentage Paid of Incurred Claims and Allocated LAE, Net of Reinsurance	[3]	36.30%
Specialty casualty | Accident Year 2019
Claims Development [Line Items]
Incurred Claims and Allocated LAE, Net of Reinsurance		$ 1,308
Total IBNR Plus Expected Development on Reported Claims		$ 773
Cumulative Number of Reported Claims | claim		51,198
Cumulative Paid Claims and Allocated LAE, Net of Reinsurance		$ 212
Cumulative Percentage Paid of Incurred Claims and Allocated LAE, Net of Reinsurance	[3]	16.20%
Specialty casualty | Excludes short-duration insurance contracts detail for accident years not separately presented
Claims Development [Line Items]
Unpaid losses and LAE, net of reinsurance (excluding unallocated LAE)		$ 3,619
Specialty financial
Claims Development [Line Items]
Incurred Claims and Allocated LAE, Net of Reinsurance		1,604
Cumulative Paid Claims and Allocated LAE, Net of Reinsurance		1,382
Unpaid losses and LAE — 11th year and prior (excluding unallocated LAE)		(1)
Unpaid losses and LAE, net of reinsurance (excluding unallocated LAE)		221
Specialty financial | Accident Year 2010
Claims Development [Line Items]
Incurred Claims and Allocated LAE, Net of Reinsurance		126	126	127	130	133	135	132	132	145	138
Total IBNR Plus Expected Development on Reported Claims		$ 1
Cumulative Number of Reported Claims | claim		21,925
Cumulative Paid Claims and Allocated LAE, Net of Reinsurance		$ 126	126	126	128	130	132	122	104	93	61
Cumulative Percentage Paid of Incurred Claims and Allocated LAE, Net of Reinsurance	[4]	100.00%
Specialty financial | Accident Year 2011
Claims Development [Line Items]
Incurred Claims and Allocated LAE, Net of Reinsurance		$ 137	139	143	144	147	153	155	157	138
Total IBNR Plus Expected Development on Reported Claims		$ 0
Cumulative Number of Reported Claims | claim		16,369
Cumulative Paid Claims and Allocated LAE, Net of Reinsurance		$ 132	132	131	131	130	123	115	111	58
Cumulative Percentage Paid of Incurred Claims and Allocated LAE, Net of Reinsurance	[4]	96.40%
Specialty financial | Accident Year 2012
Claims Development [Line Items]
Incurred Claims and Allocated LAE, Net of Reinsurance		$ 127	132	135	137	139	151	163	163
Total IBNR Plus Expected Development on Reported Claims		$ 1
Cumulative Number of Reported Claims | claim		21,076
Cumulative Paid Claims and Allocated LAE, Net of Reinsurance		$ 126	128	126	121	117	109	104	71
Cumulative Percentage Paid of Incurred Claims and Allocated LAE, Net of Reinsurance	[4]	99.20%
Specialty financial | Accident Year 2013
Claims Development [Line Items]
Incurred Claims and Allocated LAE, Net of Reinsurance		$ 122	126	127	131	137	145	140
Total IBNR Plus Expected Development on Reported Claims		$ 4
Cumulative Number of Reported Claims | claim		28,460
Cumulative Paid Claims and Allocated LAE, Net of Reinsurance		$ 118	117	117	113	107	100	70
Cumulative Percentage Paid of Incurred Claims and Allocated LAE, Net of Reinsurance	[4]	96.70%
Specialty financial | Accident Year 2014
Claims Development [Line Items]
Incurred Claims and Allocated LAE, Net of Reinsurance		$ 142	147	153	156	157	146
Total IBNR Plus Expected Development on Reported Claims		$ 5
Cumulative Number of Reported Claims | claim		29,436
Cumulative Paid Claims and Allocated LAE, Net of Reinsurance		$ 139	137	128	125	109	62
Cumulative Percentage Paid of Incurred Claims and Allocated LAE, Net of Reinsurance	[4]	97.90%
Specialty financial | Accident Year 2015
Claims Development [Line Items]
Incurred Claims and Allocated LAE, Net of Reinsurance		$ 145	153	158	160	156
Total IBNR Plus Expected Development on Reported Claims		$ 10
Cumulative Number of Reported Claims | claim		37,562
Cumulative Paid Claims and Allocated LAE, Net of Reinsurance		$ 132	133	129	110	72
Cumulative Percentage Paid of Incurred Claims and Allocated LAE, Net of Reinsurance	[4]	91.00%
Specialty financial | Accident Year 2016
Claims Development [Line Items]
Incurred Claims and Allocated LAE, Net of Reinsurance		$ 182	187	184	179
Total IBNR Plus Expected Development on Reported Claims		$ 18
Cumulative Number of Reported Claims | claim		45,054
Cumulative Paid Claims and Allocated LAE, Net of Reinsurance		$ 161	158	141	88
Cumulative Percentage Paid of Incurred Claims and Allocated LAE, Net of Reinsurance	[4]	88.50%
Specialty financial | Accident Year 2017
Claims Development [Line Items]
Incurred Claims and Allocated LAE, Net of Reinsurance		$ 212	215	212
Total IBNR Plus Expected Development on Reported Claims		$ 27
Cumulative Number of Reported Claims | claim		48,421
Cumulative Paid Claims and Allocated LAE, Net of Reinsurance		$ 186	169	120
Cumulative Percentage Paid of Incurred Claims and Allocated LAE, Net of Reinsurance	[4]	87.70%
Specialty financial | Accident Year 2018
Claims Development [Line Items]
Incurred Claims and Allocated LAE, Net of Reinsurance		$ 217	212
Total IBNR Plus Expected Development on Reported Claims		$ 30
Cumulative Number of Reported Claims | claim		46,198
Cumulative Paid Claims and Allocated LAE, Net of Reinsurance		$ 163	112
Cumulative Percentage Paid of Incurred Claims and Allocated LAE, Net of Reinsurance	[4]	75.10%
Specialty financial | Accident Year 2019
Claims Development [Line Items]
Incurred Claims and Allocated LAE, Net of Reinsurance		$ 194
Total IBNR Plus Expected Development on Reported Claims		$ 77
Cumulative Number of Reported Claims | claim		35,369
Cumulative Paid Claims and Allocated LAE, Net of Reinsurance		$ 99
Cumulative Percentage Paid of Incurred Claims and Allocated LAE, Net of Reinsurance	[4]	51.00%
Specialty financial | Excludes short-duration insurance contracts detail for accident years not separately presented
Claims Development [Line Items]
Unpaid losses and LAE, net of reinsurance (excluding unallocated LAE)		$ 222
Other specialty
Claims Development [Line Items]
Incurred Claims and Allocated LAE, Net of Reinsurance		651
Cumulative Paid Claims and Allocated LAE, Net of Reinsurance		380
Unpaid losses and LAE — 11th year and prior (excluding unallocated LAE)		42
Unpaid losses and LAE, net of reinsurance (excluding unallocated LAE)		313
Other specialty | Accident Year 2010
Claims Development [Line Items]
Incurred Claims and Allocated LAE, Net of Reinsurance		39	40	40	40	40	40	39	40	39	36
Total IBNR Plus Expected Development on Reported Claims		$ 1
Cumulative Number of Reported Claims | claim	[5]	0
Cumulative Paid Claims and Allocated LAE, Net of Reinsurance		$ 37	37	36	35	33	27	24	21	14	$ 8
Cumulative Percentage Paid of Incurred Claims and Allocated LAE, Net of Reinsurance	[6]	94.90%
Other specialty | Accident Year 2011
Claims Development [Line Items]
Incurred Claims and Allocated LAE, Net of Reinsurance		$ 42	43	44	44	43	43	42	43	39
Total IBNR Plus Expected Development on Reported Claims		$ 1
Cumulative Number of Reported Claims | claim	[5]	0
Cumulative Paid Claims and Allocated LAE, Net of Reinsurance		$ 39	38	37	36	34	28	25	20	$ 12
Cumulative Percentage Paid of Incurred Claims and Allocated LAE, Net of Reinsurance	[6]	92.90%
Other specialty | Accident Year 2012
Claims Development [Line Items]
Incurred Claims and Allocated LAE, Net of Reinsurance		$ 36	39	39	41	40	39	40	42
Total IBNR Plus Expected Development on Reported Claims		$ 2
Cumulative Number of Reported Claims | claim	[5]	0
Cumulative Paid Claims and Allocated LAE, Net of Reinsurance		$ 32	30	30	28	25	21	17	$ 8
Cumulative Percentage Paid of Incurred Claims and Allocated LAE, Net of Reinsurance	[6]	88.90%
Other specialty | Accident Year 2013
Claims Development [Line Items]
Incurred Claims and Allocated LAE, Net of Reinsurance		$ 58	53	50	47	46	47	46
Total IBNR Plus Expected Development on Reported Claims		$ 3
Cumulative Number of Reported Claims | claim	[5]	0
Cumulative Paid Claims and Allocated LAE, Net of Reinsurance		$ 51	44	37	34	22	16	$ 7
Cumulative Percentage Paid of Incurred Claims and Allocated LAE, Net of Reinsurance	[6]	87.90%
Other specialty | Accident Year 2014
Claims Development [Line Items]
Incurred Claims and Allocated LAE, Net of Reinsurance		$ 61	60	59	59	57	58
Total IBNR Plus Expected Development on Reported Claims		$ 6
Cumulative Number of Reported Claims | claim	[5]	0
Cumulative Paid Claims and Allocated LAE, Net of Reinsurance		$ 50	43	36	30	21	$ 13
Cumulative Percentage Paid of Incurred Claims and Allocated LAE, Net of Reinsurance	[6]	82.00%
Other specialty | Accident Year 2015
Claims Development [Line Items]
Incurred Claims and Allocated LAE, Net of Reinsurance		$ 76	66	63	60	59
Total IBNR Plus Expected Development on Reported Claims		$ 3
Cumulative Number of Reported Claims | claim	[5]	0
Cumulative Paid Claims and Allocated LAE, Net of Reinsurance		$ 62	50	31	26	$ 10
Cumulative Percentage Paid of Incurred Claims and Allocated LAE, Net of Reinsurance	[6]	81.60%
Other specialty | Accident Year 2016
Claims Development [Line Items]
Incurred Claims and Allocated LAE, Net of Reinsurance		$ 71	65	61	61
Total IBNR Plus Expected Development on Reported Claims		$ 15
Cumulative Number of Reported Claims | claim	[5]	0
Cumulative Paid Claims and Allocated LAE, Net of Reinsurance		$ 47	31	19	$ 9
Cumulative Percentage Paid of Incurred Claims and Allocated LAE, Net of Reinsurance	[6]	66.20%
Other specialty | Accident Year 2017
Claims Development [Line Items]
Incurred Claims and Allocated LAE, Net of Reinsurance		$ 70	65	63
Total IBNR Plus Expected Development on Reported Claims		$ 23
Cumulative Number of Reported Claims | claim	[5]	0
Cumulative Paid Claims and Allocated LAE, Net of Reinsurance		$ 30	19	$ 10
Cumulative Percentage Paid of Incurred Claims and Allocated LAE, Net of Reinsurance	[6]	42.90%
Other specialty | Accident Year 2018
Claims Development [Line Items]
Incurred Claims and Allocated LAE, Net of Reinsurance		$ 90	86
Total IBNR Plus Expected Development on Reported Claims		$ 53
Cumulative Number of Reported Claims | claim	[5]	0
Cumulative Paid Claims and Allocated LAE, Net of Reinsurance		$ 23	$ 12
Cumulative Percentage Paid of Incurred Claims and Allocated LAE, Net of Reinsurance	[6]	25.60%
Other specialty | Accident Year 2019
Claims Development [Line Items]
Incurred Claims and Allocated LAE, Net of Reinsurance		$ 108
Total IBNR Plus Expected Development on Reported Claims		$ 87
Cumulative Number of Reported Claims | claim	[5]	0
Cumulative Paid Claims and Allocated LAE, Net of Reinsurance		$ 9
Cumulative Percentage Paid of Incurred Claims and Allocated LAE, Net of Reinsurance	[6]	8.30%
Other specialty | Excludes short-duration insurance contracts detail for accident years not separately presented
Claims Development [Line Items]
Unpaid losses and LAE, net of reinsurance (excluding unallocated LAE)		$ 271

[1] Represents the cumulative percentage paid of incurred claims and allocated LAE (net of reinsurance, as estimated at December 31, 2019).

[2] Represents the cumulative percentage paid of incurred claims and allocated LAE (net of reinsurance, as estimated at December 31, 2019).

[3] Represents the cumulative percentage paid of incurred claims and allocated LAE (net of reinsurance, as estimated at December 31, 2019).

[4] Represents the cumulative percentage paid of incurred claims and allocated LAE (net of reinsurance, as estimated at December 31, 2019).

[5] The amounts shown in Other specialty represent business assumed by AFG’s internal reinsurance program from the operations that make up AFG’s other Specialty property and casualty insurance sub-segments. Accordingly, the liability for incurred claims and allocated LAE represents additional reserves held on claims counted in the tables provided for the other sub-segments (above).

[6] Represents the cumulative percentage paid of incurred claims and allocated LAE (net of reinsurance, as estimated at December 31, 2019).