Insurance (Liabilities for Unpaid Claims and Claims Expense - Development Tables) (Details) $ in Millions	Dec. 31, 2019 USD ($) Claims	Dec. 31, 2018 USD ($)	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]
Total unpaid claims and claim adjustment expenses, net of reinsurance	$ 13,587
Group Life - Term
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance	63,654
Cumulative paid claims and paid allocated claim adjustment expenses, net of reinsurance	61,612
All outstanding liabilities for incurral years not separately stated, net of reinsurance	15
Total unpaid claims and claim adjustment expenses, net of reinsurance	2,057
Group Life - Term | Short-duration Insurance Contracts, Accident Year 2011
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance	6,297	$ 6,295	$ 6,294	$ 6,295	$ 6,287	$ 6,269	$ 6,293	$ 6,290	$ 6,318
Total IBNR Liabilities Plus Expected Development on Reported Claims	$ 1
Cumulative Number of Reported Claims | Claims	207,857
Cumulative paid claims and paid allocated claim adjustment expenses, net of reinsurance	$ 6,296	6,295	6,292	6,290	6,281	6,256	6,239	6,194	4,982
Group Life - Term | Short-duration Insurance Contracts, Accident Year 2012
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance	6,572	6,569	6,569	6,568	6,546	6,569	6,579	6,503
Total IBNR Liabilities Plus Expected Development on Reported Claims	$ 2
Cumulative Number of Reported Claims | Claims	209,500
Cumulative paid claims and paid allocated claim adjustment expenses, net of reinsurance	$ 6,569	6,566	6,565	6,558	6,532	6,518	6,472	5,132
Group Life - Term | Short-duration Insurance Contracts, Accident Year 2013
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance	6,723	6,720	6,730	6,720	6,719	6,713	6,637
Total IBNR Liabilities Plus Expected Development on Reported Claims	$ 2
Cumulative Number of Reported Claims | Claims	212,019
Cumulative paid claims and paid allocated claim adjustment expenses, net of reinsurance	$ 6,720	6,715	6,711	6,678	6,664	6,614	5,216
Group Life - Term | Short-duration Insurance Contracts, Accident Year 2014
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance	6,919	6,914	6,910	6,913	6,919	6,986
Total IBNR Liabilities Plus Expected Development on Reported Claims	$ 4
Cumulative Number of Reported Claims | Claims	214,563
Cumulative paid claims and paid allocated claim adjustment expenses, net of reinsurance	$ 6,912	6,902	6,869	6,858	6,809	5,428
Group Life - Term | Short-duration Insurance Contracts, Accident Year 2015
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance	7,024	7,021	7,014	7,015	7,040
Total IBNR Liabilities Plus Expected Development on Reported Claims	$ 5
Cumulative Number of Reported Claims | Claims	216,429
Cumulative paid claims and paid allocated claim adjustment expenses, net of reinsurance	$ 7,008	6,974	6,958	6,913	5,524
Group Life - Term | Short-duration Insurance Contracts, Accident Year 2016
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance	7,104	7,095	7,085	7,125
Total IBNR Liabilities Plus Expected Development on Reported Claims	$ 8
Cumulative Number of Reported Claims | Claims	215,108
Cumulative paid claims and paid allocated claim adjustment expenses, net of reinsurance	$ 7,053	7,034	6,980	5,582
Group Life - Term | Short-duration Insurance Contracts, Accident Year 2017
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance	7,425	7,418	7,432
Total IBNR Liabilities Plus Expected Development on Reported Claims	$ 15
Cumulative Number of Reported Claims | Claims	253,613
Cumulative paid claims and paid allocated claim adjustment expenses, net of reinsurance	$ 7,355	7,292	5,761
Group Life - Term | Short-duration Insurance Contracts, Accident Year 2018
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance	7,655	7,757
Total IBNR Liabilities Plus Expected Development on Reported Claims	$ 37
Cumulative Number of Reported Claims | Claims	235,820
Cumulative paid claims and paid allocated claim adjustment expenses, net of reinsurance	$ 7,521	6,008
Group Life - Term | Short-Duration Insurance Contracts, Accident Year 2019
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance	7,935
Total IBNR Liabilities Plus Expected Development on Reported Claims	$ 848
Cumulative Number of Reported Claims | Claims	185,891
Cumulative paid claims and paid allocated claim adjustment expenses, net of reinsurance	$ 6,178
Group Life - Term | Asia
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance	2,123
Cumulative paid claims and paid allocated claim adjustment expenses, net of reinsurance	1,506
All outstanding liabilities for incurral years not separately stated, net of reinsurance	10
Total unpaid claims and claim adjustment expenses, net of reinsurance	627
Group Life - Term | Asia | Short-duration Insurance Contracts, Accident Year 2010
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance	118	122	130	121	93	96	96	75	70	$ 73
Total IBNR Liabilities Plus Expected Development on Reported Claims	$ 2
Cumulative Number of Reported Claims | Claims	2,812
Cumulative paid claims and paid allocated claim adjustment expenses, net of reinsurance	$ 116	113	108	102	80	71	58	48	36	18
Group Life - Term | Asia | Short-duration Insurance Contracts, Accident Year 2011
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance	109	116	119	112	84	80	79	61	58
Total IBNR Liabilities Plus Expected Development on Reported Claims	$ 5
Cumulative Number of Reported Claims | Claims	3,021
Cumulative paid claims and paid allocated claim adjustment expenses, net of reinsurance	$ 104	100	98	92	73	60	49	36	11
Group Life - Term | Asia | Short-duration Insurance Contracts, Accident Year 2012
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance	114	120	110	107	106	92	94	88
Total IBNR Liabilities Plus Expected Development on Reported Claims	$ 9
Cumulative Number of Reported Claims | Claims	4,536
Cumulative paid claims and paid allocated claim adjustment expenses, net of reinsurance	$ 105	102	101	96	89	77	58	27
Group Life - Term | Asia | Short-duration Insurance Contracts, Accident Year 2013
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance	159	159	150	151	156	135	133
Total IBNR Liabilities Plus Expected Development on Reported Claims	$ 15
Cumulative Number of Reported Claims | Claims	5,210
Cumulative paid claims and paid allocated claim adjustment expenses, net of reinsurance	$ 144	147	134	123	109	89	39
Group Life - Term | Asia | Short-duration Insurance Contracts, Accident Year 2014
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance	237	241	230	230	250	267
Total IBNR Liabilities Plus Expected Development on Reported Claims	$ 31
Cumulative Number of Reported Claims | Claims	6,167
Cumulative paid claims and paid allocated claim adjustment expenses, net of reinsurance	$ 205	204	182	161	130	62
Group Life - Term | Asia | Short-duration Insurance Contracts, Accident Year 2015
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance	247	237	243	240	252
Total IBNR Liabilities Plus Expected Development on Reported Claims	$ 37
Cumulative Number of Reported Claims | Claims	5,970
Cumulative paid claims and paid allocated claim adjustment expenses, net of reinsurance	$ 212	187	173	139	73
Group Life - Term | Asia | Short-duration Insurance Contracts, Accident Year 2016
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance	215	202	214	210
Total IBNR Liabilities Plus Expected Development on Reported Claims	$ 42
Cumulative Number of Reported Claims | Claims	3,895
Cumulative paid claims and paid allocated claim adjustment expenses, net of reinsurance	$ 173	138	122	59
Group Life - Term | Asia | Short-duration Insurance Contracts, Accident Year 2017
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance	261	253	273
Total IBNR Liabilities Plus Expected Development on Reported Claims	$ 56
Cumulative Number of Reported Claims | Claims	4,056
Cumulative paid claims and paid allocated claim adjustment expenses, net of reinsurance	$ 190	144	79
Group Life - Term | Asia | Short-duration Insurance Contracts, Accident Year 2018
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance	304	332
Total IBNR Liabilities Plus Expected Development on Reported Claims	$ 96
Cumulative Number of Reported Claims | Claims	3,730
Cumulative paid claims and paid allocated claim adjustment expenses, net of reinsurance	$ 160	87
Group Life - Term | Asia | Short-Duration Insurance Contracts, Accident Year 2019
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance	359
Total IBNR Liabilities Plus Expected Development on Reported Claims	$ 185
Cumulative Number of Reported Claims | Claims	2,390
Cumulative paid claims and paid allocated claim adjustment expenses, net of reinsurance	$ 97
Group Long-Term Disability
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance	9,975
Cumulative paid claims and paid allocated claim adjustment expenses, net of reinsurance	4,713
All outstanding liabilities for incurral years not separately stated, net of reinsurance	1,829
Total unpaid claims and claim adjustment expenses, net of reinsurance	7,091
Group Long-Term Disability | Short-duration Insurance Contracts, Accident Year 2011
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance	914	917	918	923	924	914	894	916	955
Total IBNR Liabilities Plus Expected Development on Reported Claims	$ 0
Cumulative Number of Reported Claims | Claims	21,644
Cumulative paid claims and paid allocated claim adjustment expenses, net of reinsurance	$ 670	635	588	537	478	411	337	217	44
Group Long-Term Disability | Short-duration Insurance Contracts, Accident Year 2012
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance	1,015	1,021	1,037	1,034	1,014	980	979	966
Total IBNR Liabilities Plus Expected Development on Reported Claims	$ 0
Cumulative Number of Reported Claims | Claims	20,085
Cumulative paid claims and paid allocated claim adjustment expenses, net of reinsurance	$ 694	648	591	524	453	365	229	43
Group Long-Term Disability | Short-duration Insurance Contracts, Accident Year 2013
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance	1,044	1,069	1,070	1,049	1,032	1,027	1,008
Total IBNR Liabilities Plus Expected Development on Reported Claims	$ 0
Cumulative Number of Reported Claims | Claims	21,137
Cumulative paid claims and paid allocated claim adjustment expenses, net of reinsurance	$ 676	622	551	475	382	234	43
Group Long-Term Disability | Short-duration Insurance Contracts, Accident Year 2014
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance	1,098	1,109	1,101	1,079	1,077	1,076
Total IBNR Liabilities Plus Expected Development on Reported Claims	$ 0
Cumulative Number of Reported Claims | Claims	22,851
Cumulative paid claims and paid allocated claim adjustment expenses, net of reinsurance	$ 677	609	526	428	266	51
Group Long-Term Disability | Short-duration Insurance Contracts, Accident Year 2015
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance	1,087	1,100	1,093	1,105	1,082
Total IBNR Liabilities Plus Expected Development on Reported Claims	$ 0
Cumulative Number of Reported Claims | Claims	21,203
Cumulative paid claims and paid allocated claim adjustment expenses, net of reinsurance	$ 601	524	427	264	50
Group Long-Term Disability | Short-duration Insurance Contracts, Accident Year 2016
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance	1,162	1,159	1,139	1,131
Total IBNR Liabilities Plus Expected Development on Reported Claims	$ 0
Cumulative Number of Reported Claims | Claims	17,958
Cumulative paid claims and paid allocated claim adjustment expenses, net of reinsurance	$ 548	433	267	49
Group Long-Term Disability | Short-duration Insurance Contracts, Accident Year 2017
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance	1,203	1,202	1,244
Total IBNR Liabilities Plus Expected Development on Reported Claims	$ 12
Cumulative Number of Reported Claims | Claims	16,266
Cumulative paid claims and paid allocated claim adjustment expenses, net of reinsurance	$ 476	290	56
Group Long-Term Disability | Short-duration Insurance Contracts, Accident Year 2018
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance	1,175	1,240
Total IBNR Liabilities Plus Expected Development on Reported Claims	$ 35
Cumulative Number of Reported Claims | Claims	14,869
Cumulative paid claims and paid allocated claim adjustment expenses, net of reinsurance	$ 314	54
Group Long-Term Disability | Short-Duration Insurance Contracts, Accident Year 2019
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance	1,277
Total IBNR Liabilities Plus Expected Development on Reported Claims	$ 657
Cumulative Number of Reported Claims | Claims	8,350
Cumulative paid claims and paid allocated claim adjustment expenses, net of reinsurance	$ 57
Property & Casualty - Auto
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance	9,198
Cumulative paid claims and paid allocated claim adjustment expenses, net of reinsurance	8,062
All outstanding liabilities for incurral years not separately stated, net of reinsurance	26
Total unpaid claims and claim adjustment expenses, net of reinsurance	1,162
Property & Casualty - Auto | Short-duration Insurance Contracts, Accident Year 2010
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance	822	823	822	825	826	833	847	853	873	863
Total IBNR Liabilities Plus Expected Development on Reported Claims	$ 0
Cumulative Number of Reported Claims | Claims	204,497
Cumulative paid claims and paid allocated claim adjustment expenses, net of reinsurance	$ 821	820	818	816	810	796	762	695	572	319
Property & Casualty - Auto | Short-duration Insurance Contracts, Accident Year 2011
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance	841	842	843	843	846	855	869	876	863
Total IBNR Liabilities Plus Expected Development on Reported Claims	$ 1
Cumulative Number of Reported Claims | Claims	204,972
Cumulative paid claims and paid allocated claim adjustment expenses, net of reinsurance	$ 837	835	831	825	810	777	711	590	324
Property & Casualty - Auto | Short-duration Insurance Contracts, Accident Year 2012
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance	846	846	847	846	851	869	881	882
Total IBNR Liabilities Plus Expected Development on Reported Claims	$ 1
Cumulative Number of Reported Claims | Claims	199,357
Cumulative paid claims and paid allocated claim adjustment expenses, net of reinsurance	$ 843	840	831	815	783	715	600	333
Property & Casualty - Auto | Short-duration Insurance Contracts, Accident Year 2013
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance	874	876	876	878	882	900	911
Total IBNR Liabilities Plus Expected Development on Reported Claims	$ 1
Cumulative Number of Reported Claims | Claims	204,372
Cumulative paid claims and paid allocated claim adjustment expenses, net of reinsurance	$ 869	859	843	809	743	618	346
Property & Casualty - Auto | Short-duration Insurance Contracts, Accident Year 2014
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance	912	911	910	913	910	897
Total IBNR Liabilities Plus Expected Development on Reported Claims	$ 2
Cumulative Number of Reported Claims | Claims	207,630
Cumulative paid claims and paid allocated claim adjustment expenses, net of reinsurance	$ 900	884	844	777	648	352
Property & Casualty - Auto | Short-duration Insurance Contracts, Accident Year 2015
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance	983	980	979	984	975
Total IBNR Liabilities Plus Expected Development on Reported Claims	$ 5
Cumulative Number of Reported Claims | Claims	212,806
Cumulative paid claims and paid allocated claim adjustment expenses, net of reinsurance	$ 956	903	822	691	384
Property & Casualty - Auto | Short-duration Insurance Contracts, Accident Year 2016
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance	999	997	1,002	1,012
Total IBNR Liabilities Plus Expected Development on Reported Claims	$ 11
Cumulative Number of Reported Claims | Claims	211,041
Cumulative paid claims and paid allocated claim adjustment expenses, net of reinsurance	$ 932	842	702	396
Property & Casualty - Auto | Short-duration Insurance Contracts, Accident Year 2017
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance	987	960	957
Total IBNR Liabilities Plus Expected Development on Reported Claims	$ 33
Cumulative Number of Reported Claims | Claims	191,978
Cumulative paid claims and paid allocated claim adjustment expenses, net of reinsurance	$ 838	686	379
Property & Casualty - Auto | Short-duration Insurance Contracts, Accident Year 2018
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance	964	938
Total IBNR Liabilities Plus Expected Development on Reported Claims	$ 78
Cumulative Number of Reported Claims | Claims	180,220
Cumulative paid claims and paid allocated claim adjustment expenses, net of reinsurance	$ 687	371
Property & Casualty - Auto | Short-Duration Insurance Contracts, Accident Year 2019
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance	970
Total IBNR Liabilities Plus Expected Development on Reported Claims	$ 203
Cumulative Number of Reported Claims | Claims	163,655
Cumulative paid claims and paid allocated claim adjustment expenses, net of reinsurance	$ 379
Property & Casualty - Home
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance	6,981
Cumulative paid claims and paid allocated claim adjustment expenses, net of reinsurance	6,753
All outstanding liabilities for incurral years not separately stated, net of reinsurance	1
Total unpaid claims and claim adjustment expenses, net of reinsurance	229
Property & Casualty - Home | Short-duration Insurance Contracts, Accident Year 2010
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance	579	579	579	580	581	582	584	587	589	573
Total IBNR Liabilities Plus Expected Development on Reported Claims	$ 0
Cumulative Number of Reported Claims | Claims	115,522
Cumulative paid claims and paid allocated claim adjustment expenses, net of reinsurance	$ 579	579	578	578	577	574	571	562	546	436
Property & Casualty - Home | Short-duration Insurance Contracts, Accident Year 2011
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance	833	833	834	835	835	840	843	868	891
Total IBNR Liabilities Plus Expected Development on Reported Claims	$ 0
Cumulative Number of Reported Claims | Claims	166,467
Cumulative paid claims and paid allocated claim adjustment expenses, net of reinsurance	$ 833	833	832	830	827	825	819	804	690
Property & Casualty - Home | Short-duration Insurance Contracts, Accident Year 2012
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance	692	693	694	696	698	703	713	714
Total IBNR Liabilities Plus Expected Development on Reported Claims	$ 0
Cumulative Number of Reported Claims | Claims	146,559
Cumulative paid claims and paid allocated claim adjustment expenses, net of reinsurance	$ 691	690	690	689	687	681	668	559
Property & Casualty - Home | Short-duration Insurance Contracts, Accident Year 2013
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance	632	632	634	635	635	652	654
Total IBNR Liabilities Plus Expected Development on Reported Claims	$ 1
Cumulative Number of Reported Claims | Claims	107,562
Cumulative paid claims and paid allocated claim adjustment expenses, net of reinsurance	$ 630	629	628	626	618	604	505
Property & Casualty - Home | Short-duration Insurance Contracts, Accident Year 2014
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance	699	701	705	704	702	707
Total IBNR Liabilities Plus Expected Development on Reported Claims	$ 1
Cumulative Number of Reported Claims | Claims	113,679
Cumulative paid claims and paid allocated claim adjustment expenses, net of reinsurance	$ 696	695	692	685	670	574
Property & Casualty - Home | Short-duration Insurance Contracts, Accident Year 2015
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance	742	746	752	753	759
Total IBNR Liabilities Plus Expected Development on Reported Claims	$ 1
Cumulative Number of Reported Claims | Claims	107,259
Cumulative paid claims and paid allocated claim adjustment expenses, net of reinsurance	$ 739	736	731	717	603
Property & Casualty - Home | Short-duration Insurance Contracts, Accident Year 2016
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance	736	743	743	740
Total IBNR Liabilities Plus Expected Development on Reported Claims	$ 3
Cumulative Number of Reported Claims | Claims	107,271
Cumulative paid claims and paid allocated claim adjustment expenses, net of reinsurance	$ 727	720	704	593
Property & Casualty - Home | Short-duration Insurance Contracts, Accident Year 2017
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance	761	763	747
Total IBNR Liabilities Plus Expected Development on Reported Claims	$ 8
Cumulative Number of Reported Claims | Claims	115,610
Cumulative paid claims and paid allocated claim adjustment expenses, net of reinsurance	$ 742	727	610
Property & Casualty - Home | Short-duration Insurance Contracts, Accident Year 2018
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance	658	671
Total IBNR Liabilities Plus Expected Development on Reported Claims	$ 9
Cumulative Number of Reported Claims | Claims	98,754
Cumulative paid claims and paid allocated claim adjustment expenses, net of reinsurance	$ 629	529
Property & Casualty - Home | Short-Duration Insurance Contracts, Accident Year 2019
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance	649
Total IBNR Liabilities Plus Expected Development on Reported Claims	$ 67
Cumulative Number of Reported Claims | Claims	80,133
Cumulative paid claims and paid allocated claim adjustment expenses, net of reinsurance	$ 487
Protection Life
Claims Development [Line Items]
Total unpaid claims and claim adjustment expenses, net of reinsurance	317
Protection Life | Latin America
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance	3,337
Cumulative paid claims and paid allocated claim adjustment expenses, net of reinsurance	3,030
All outstanding liabilities for incurral years not separately stated, net of reinsurance	10
Total unpaid claims and claim adjustment expenses, net of reinsurance	317
Protection Life | Latin America | Short-duration Insurance Contracts, Accident Year 2010
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance	344	344	342	341	341	341	341	340	333	259
Total IBNR Liabilities Plus Expected Development on Reported Claims	$ 0
Cumulative Number of Reported Claims | Claims	34,663
Cumulative paid claims and paid allocated claim adjustment expenses, net of reinsurance	$ 324	321	320	318	318	318	318	317	310	238
Protection Life | Latin America | Short-duration Insurance Contracts, Accident Year 2011
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance	230	230	227	231	230	230	229	222	144
Total IBNR Liabilities Plus Expected Development on Reported Claims	$ 0
Cumulative Number of Reported Claims | Claims	28,955
Cumulative paid claims and paid allocated claim adjustment expenses, net of reinsurance	$ 228	227	226	225	225	225	224	218	141
Protection Life | Latin America | Short-duration Insurance Contracts, Accident Year 2012
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance	216	215	212	215	214	213	208	153
Total IBNR Liabilities Plus Expected Development on Reported Claims	$ 0
Cumulative Number of Reported Claims | Claims	29,014
Cumulative paid claims and paid allocated claim adjustment expenses, net of reinsurance	$ 213	211	210	211	211	209	205	151
Protection Life | Latin America | Short-duration Insurance Contracts, Accident Year 2013
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance	247	246	243	244	243	236	168
Total IBNR Liabilities Plus Expected Development on Reported Claims	$ 0
Cumulative Number of Reported Claims | Claims	33,259
Cumulative paid claims and paid allocated claim adjustment expenses, net of reinsurance	$ 238	236	234	234	234	229	165
Protection Life | Latin America | Short-duration Insurance Contracts, Accident Year 2014
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance	359	358	354	387	376	247
Total IBNR Liabilities Plus Expected Development on Reported Claims	$ 0
Cumulative Number of Reported Claims | Claims	41,648
Cumulative paid claims and paid allocated claim adjustment expenses, net of reinsurance	$ 346	343	339	336	330	221
Protection Life | Latin America | Short-duration Insurance Contracts, Accident Year 2015
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance	438	438	432	463	324
Total IBNR Liabilities Plus Expected Development on Reported Claims	$ 0
Cumulative Number of Reported Claims | Claims	47,505
Cumulative paid claims and paid allocated claim adjustment expenses, net of reinsurance	$ 410	403	395	372	264
Protection Life | Latin America | Short-duration Insurance Contracts, Accident Year 2016
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance	466	459	447	347
Total IBNR Liabilities Plus Expected Development on Reported Claims	$ 1
Cumulative Number of Reported Claims | Claims	41,590
Cumulative paid claims and paid allocated claim adjustment expenses, net of reinsurance	$ 460	452	432	242
Protection Life | Latin America | Short-duration Insurance Contracts, Accident Year 2017
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance	349	350	358
Total IBNR Liabilities Plus Expected Development on Reported Claims	$ 5
Cumulative Number of Reported Claims | Claims	33,396
Cumulative paid claims and paid allocated claim adjustment expenses, net of reinsurance	$ 335	318	210
Protection Life | Latin America | Short-duration Insurance Contracts, Accident Year 2018
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance	324	334
Total IBNR Liabilities Plus Expected Development on Reported Claims	$ 16
Cumulative Number of Reported Claims | Claims	31,302
Cumulative paid claims and paid allocated claim adjustment expenses, net of reinsurance	$ 287	169
Protection Life | Latin America | Short-Duration Insurance Contracts, Accident Year 2019
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance	364
Total IBNR Liabilities Plus Expected Development on Reported Claims	$ 124
Cumulative Number of Reported Claims | Claims	24,180
Cumulative paid claims and paid allocated claim adjustment expenses, net of reinsurance	$ 189
Protection Health
Claims Development [Line Items]
Total unpaid claims and claim adjustment expenses, net of reinsurance	73
Protection Health | Latin America
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance	2,753
Cumulative paid claims and paid allocated claim adjustment expenses, net of reinsurance	2,689
All outstanding liabilities for incurral years not separately stated, net of reinsurance	9
Total unpaid claims and claim adjustment expenses, net of reinsurance	73
Protection Health | Latin America | Short-duration Insurance Contracts, Accident Year 2010
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance	215	215	215	211	211	211	210	210	208	187
Total IBNR Liabilities Plus Expected Development on Reported Claims	$ 0
Cumulative Number of Reported Claims | Claims	96,784
Cumulative paid claims and paid allocated claim adjustment expenses, net of reinsurance	$ 215	214	214	211	211	211	210	210	208	$ 187
Protection Health | Latin America | Short-duration Insurance Contracts, Accident Year 2011
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance	249	249	249	252	252	252	251	249	224
Total IBNR Liabilities Plus Expected Development on Reported Claims	$ 0
Cumulative Number of Reported Claims | Claims	106,631
Cumulative paid claims and paid allocated claim adjustment expenses, net of reinsurance	$ 249	249	249	252	252	252	251	249	$ 224
Protection Health | Latin America | Short-duration Insurance Contracts, Accident Year 2012
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance	245	245	244	246	246	245	243	216
Total IBNR Liabilities Plus Expected Development on Reported Claims	$ 0
Cumulative Number of Reported Claims | Claims	100,400
Cumulative paid claims and paid allocated claim adjustment expenses, net of reinsurance	$ 245	245	245	246	246	245	243	$ 216
Protection Health | Latin America | Short-duration Insurance Contracts, Accident Year 2013
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance	264	264	264	267	266	265	235
Total IBNR Liabilities Plus Expected Development on Reported Claims	$ 0
Cumulative Number of Reported Claims | Claims	104,234
Cumulative paid claims and paid allocated claim adjustment expenses, net of reinsurance	$ 264	264	264	267	266	265	$ 235
Protection Health | Latin America | Short-duration Insurance Contracts, Accident Year 2014
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance	270	270	271	273	271	243
Total IBNR Liabilities Plus Expected Development on Reported Claims	$ 0
Cumulative Number of Reported Claims | Claims	97,755
Cumulative paid claims and paid allocated claim adjustment expenses, net of reinsurance	$ 267	267	267	271	269	$ 241
Protection Health | Latin America | Short-duration Insurance Contracts, Accident Year 2015
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance	238	238	239	237	209
Total IBNR Liabilities Plus Expected Development on Reported Claims	$ 0
Cumulative Number of Reported Claims | Claims	87,108
Cumulative paid claims and paid allocated claim adjustment expenses, net of reinsurance	$ 237	237	236	237	$ 209
Protection Health | Latin America | Short-duration Insurance Contracts, Accident Year 2016
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance	313	313	316	274
Total IBNR Liabilities Plus Expected Development on Reported Claims	$ 1
Cumulative Number of Reported Claims | Claims	105,877
Cumulative paid claims and paid allocated claim adjustment expenses, net of reinsurance	$ 312	311	308	$ 258
Protection Health | Latin America | Short-duration Insurance Contracts, Accident Year 2017
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance	370	370	397
Total IBNR Liabilities Plus Expected Development on Reported Claims	$ 3
Cumulative Number of Reported Claims | Claims	120,142
Cumulative paid claims and paid allocated claim adjustment expenses, net of reinsurance	$ 367	365	$ 324
Protection Health | Latin America | Short-duration Insurance Contracts, Accident Year 2018
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance	447	425
Total IBNR Liabilities Plus Expected Development on Reported Claims	$ 6
Cumulative Number of Reported Claims | Claims	140,671
Cumulative paid claims and paid allocated claim adjustment expenses, net of reinsurance	$ 414	$ 363
Protection Health | Latin America | Short-Duration Insurance Contracts, Accident Year 2019
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance	142
Total IBNR Liabilities Plus Expected Development on Reported Claims	$ 19
Cumulative Number of Reported Claims | Claims	87,541
Cumulative paid claims and paid allocated claim adjustment expenses, net of reinsurance	$ 119