Assets Measured at Fair Value on Recurring Basis and Utilized Significant Unobservable (Level 3) Inputs to Determine Fair Value (Detail) - USD ($) $ in Millions		3 Months Ended		6 Months Ended
		Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning balance		$ 3,181	$ 3,621	$ 3,254	$ 3,913
Total realized and unrealized gains (losses) included in net income, assets		$ 7	$ (2)	$ 9	$ (6)
Fair Value, Asset, Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration]		Income (Loss) from Continuing Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest	Income (Loss) from Continuing Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest	Income (Loss) from Continuing Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest	Income (Loss) from Continuing Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest
Total realized and unrealized gains (losses), Included in OCI		$ (41)	$ (293)	$ 11	$ (556)
Fair Value, Asset, Recurring Basis, Unobservable Input Reconciliation, Asset, Gain (Loss), Statement of Other Comprehensive Income or Comprehensive Income [Extensible Enumeration]		Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest	Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest	Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest	Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest
Purchases		$ 70	$ 137	$ 159	$ 273
Sales		(36)	(17)	(65)	(18)
Issuances		0	0	0	0
Settlements		(51)	(18)	(193)	(112)
Transfer into Level 3	[1]	41	81	54	102
Transfer out of Level 3	[1]	(60)	(59)	(118)	(146)
Ending balance		3,111	3,450	3,111	3,450
Total gains (losses) included in net income attributable to assets still held		6	(5)	7	3
Total gains (losses) included in OCI attributable to assets still held		$ (52)	$ (287)	$ (9)	$ (543)
Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration]		Income (Loss) from Continuing Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest	Income (Loss) from Continuing Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest	Income (Loss) from Continuing Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest	Income (Loss) from Continuing Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest
Other invested assets
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning balance		$ 10	$ 30	$ 6	$ 42
Total realized and unrealized gains (losses) included in net income, assets		5	(1)	6	(7)
Total realized and unrealized gains (losses), Included in OCI		0	0	0	0
Purchases		9	3	12	8
Sales		0	0	0	0
Issuances		0	0	0	0
Settlements		(2)	(2)	(2)	(13)
Transfer into Level 3	[1]	0	0	0	0
Transfer out of Level 3	[1]	0	0	0	0
Ending balance		22	30	22	30
Total gains (losses) included in net income attributable to assets still held		4	(4)	5	2
Total gains (losses) included in OCI attributable to assets still held		0	0	0	0
Other invested assets | Short-term investments
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning balance		0		0
Total realized and unrealized gains (losses) included in net income, assets		0		0
Total realized and unrealized gains (losses), Included in OCI		0		0
Purchases		7		7
Sales		0		0
Issuances		0		0
Settlements		0		0
Transfer into Level 3	[1]	0		0
Transfer out of Level 3	[1]	0		0
Ending balance		7		7
Total gains (losses) included in net income attributable to assets still held		0		0
Total gains (losses) included in OCI attributable to assets still held		0		0
Other invested assets | Derivative assets
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning balance		10	30	6	42
Total realized and unrealized gains (losses) included in net income, assets		5	(1)	6	(7)
Total realized and unrealized gains (losses), Included in OCI		0	0	0	0
Purchases		2	3	5	8
Sales		0	0	0	0
Issuances		0	0	0	0
Settlements		(2)	(2)	(2)	(13)
Transfer into Level 3	[1]	0	0	0	0
Transfer out of Level 3	[1]	0	0	0	0
Ending balance		15	30	15	30
Total gains (losses) included in net income attributable to assets still held		4	(4)	5	2
Total gains (losses) included in OCI attributable to assets still held		0	0	0	0
Other invested assets | Derivative assets | Equity index options
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning balance		10	30	6	42
Total realized and unrealized gains (losses) included in net income, assets		5	(1)	6	(7)
Total realized and unrealized gains (losses), Included in OCI		0	0	0	0
Purchases		2	3	5	8
Sales		0	0	0	0
Issuances		0	0	0	0
Settlements		(2)	(2)	(2)	(13)
Transfer into Level 3	[1]	0	0	0	0
Transfer out of Level 3	[1]	0	0	0	0
Ending balance		15	30	15	30
Total gains (losses) included in net income attributable to assets still held		4	(4)	5	2
Total gains (losses) included in OCI attributable to assets still held		0	0	0	0
Fixed maturity securities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning balance		3,116	3,529	3,190	3,808
Total realized and unrealized gains (losses) included in net income, assets		3	2	6	4
Total realized and unrealized gains (losses), Included in OCI		(41)	(293)	11	(556)
Purchases		60	134	146	265
Sales		(32)	(16)	(60)	(17)
Issuances		0	0	0	0
Settlements		(49)	(16)	(191)	(99)
Transfer into Level 3	[1]	41	81	54	102
Transfer out of Level 3	[1]	(60)	(59)	(118)	(145)
Ending balance		3,038	3,362	3,038	3,362
Total gains (losses) included in net income attributable to assets still held		3	2	5	4
Total gains (losses) included in OCI attributable to assets still held		(52)	(287)	(9)	(543)
Fixed maturity securities | State and political subdivisions
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning balance		59	71	55	82
Total realized and unrealized gains (losses) included in net income, assets		1	1	2	2
Total realized and unrealized gains (losses), Included in OCI		0	(9)	3	(21)
Purchases		0	0	0	0
Sales		0	0	0	0
Issuances		0	0	0	0
Settlements		0	0	0	0
Transfer into Level 3	[1]	0	0	0	0
Transfer out of Level 3	[1]	0	0	0	0
Ending balance		60	63	60	63
Total gains (losses) included in net income attributable to assets still held		1	1	2	2
Total gains (losses) included in OCI attributable to assets still held		0	(9)	3	(21)
Fixed maturity securities | U.S. corporate
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning balance		2,115	2,269	2,122	2,381
Total realized and unrealized gains (losses) included in net income, assets		0	0	0	0
Total realized and unrealized gains (losses), Included in OCI		(21)	(206)	(1)	(373)
Purchases		49	85	104	191
Sales		(31)	0	(41)	0
Issuances		0	0	0	0
Settlements		(47)	(14)	(91)	(31)
Transfer into Level 3	[1]	11	70	24	70
Transfer out of Level 3	[1]	(60)	(54)	(101)	(88)
Ending balance		2,016	2,150	2,016	2,150
Total gains (losses) included in net income attributable to assets still held		0	0	0	0
Total gains (losses) included in OCI attributable to assets still held		(32)	(199)	(12)	(364)
Fixed maturity securities | U.S. corporate | Utilities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning balance		859	912	842	950
Total realized and unrealized gains (losses) included in net income, assets		0	0	0	0
Total realized and unrealized gains (losses), Included in OCI		(11)	(92)	0	(165)
Purchases		0	0	40	35
Sales		(31)	0	(40)	0
Issuances		0	0	0	0
Settlements		(10)	(1)	(10)	(1)
Transfer into Level 3	[1]	11	2	11	2
Transfer out of Level 3	[1]	0	(11)	(25)	(11)
Ending balance		818	810	818	810
Total gains (losses) included in net income attributable to assets still held		0	0	0	0
Total gains (losses) included in OCI attributable to assets still held		(18)	(92)	(8)	(165)
Fixed maturity securities | U.S. corporate | Energy
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning balance		115	72	116	76
Total realized and unrealized gains (losses) included in net income, assets		0	0	0	0
Total realized and unrealized gains (losses), Included in OCI		0	(11)	1	(15)
Purchases		0	0	0	0
Sales		0	0	(1)	0
Issuances		0	0	0	0
Settlements		(1)	(7)	(2)	(7)
Transfer into Level 3	[1]	0	68	0	68
Transfer out of Level 3	[1]	(55)	0	(55)	0
Ending balance		59	122	59	122
Total gains (losses) included in net income attributable to assets still held		0	0	0	0
Total gains (losses) included in OCI attributable to assets still held		(1)	(11)	1	(15)
Fixed maturity securities | U.S. corporate | Finance and insurance
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning balance		697	676	687	685
Total realized and unrealized gains (losses) included in net income, assets		0	0	0	0
Total realized and unrealized gains (losses), Included in OCI		(6)	(67)	(3)	(123)
Purchases		48	85	63	151
Sales		0	0	0	0
Issuances		0	0	0	0
Settlements		(30)	(1)	(35)	(3)
Transfer into Level 3	[1]	0	0	0	0
Transfer out of Level 3	[1]	(5)	(39)	(8)	(56)
Ending balance		704	654	704	654
Total gains (losses) included in net income attributable to assets still held		0	0	0	0
Total gains (losses) included in OCI attributable to assets still held		(10)	(61)	(6)	(116)
Fixed maturity securities | U.S. corporate | Consumer-non-cyclical
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning balance		69	92	82	104
Total realized and unrealized gains (losses) included in net income, assets		0	0	0	0
Total realized and unrealized gains (losses), Included in OCI		(1)	(6)	0	(11)
Purchases		0	0	0	0
Sales		0	0	0	0
Issuances		0	0	0	0
Settlements		0	0	(14)	(7)
Transfer into Level 3	[1]	0	0	0	0
Transfer out of Level 3	[1]	0	0	0	0
Ending balance		68	86	68	86
Total gains (losses) included in net income attributable to assets still held		0	0	0	0
Total gains (losses) included in OCI attributable to assets still held		(1)	(5)	0	(11)
Fixed maturity securities | U.S. corporate | Technology and communications
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning balance		12	28	24	29
Total realized and unrealized gains (losses) included in net income, assets		0	0	0	0
Total realized and unrealized gains (losses), Included in OCI		(1)	(3)	0	(4)
Purchases		0	0	0	0
Sales		0	0	0	0
Issuances		0	0	0	0
Settlements		0	0	0	0
Transfer into Level 3	[1]	0	0	0	0
Transfer out of Level 3	[1]	0	0	(13)	0
Ending balance		11	25	11	25
Total gains (losses) included in net income attributable to assets still held		0	0	0	0
Total gains (losses) included in OCI attributable to assets still held		0	(3)	0	(4)
Fixed maturity securities | U.S. corporate | Industrial
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning balance		22	35	22	37
Total realized and unrealized gains (losses) included in net income, assets		0	0	0	0
Total realized and unrealized gains (losses), Included in OCI		0	(2)	0	(4)
Purchases		0	0	0	0
Sales		0	0	0	0
Issuances		0	0	0	0
Settlements		0	0	0	0
Transfer into Level 3	[1]	0	0	0	0
Transfer out of Level 3	[1]	0	0	0	0
Ending balance		22	33	22	33
Total gains (losses) included in net income attributable to assets still held		0	0	0	0
Total gains (losses) included in OCI attributable to assets still held		0	(2)	0	(4)
Fixed maturity securities | U.S. corporate | Capital goods
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning balance		34	41	34	45
Total realized and unrealized gains (losses) included in net income, assets		0	0	0	0
Total realized and unrealized gains (losses), Included in OCI		0	(3)	0	(7)
Purchases		0	0	0	0
Sales		0	0	0	0
Issuances		0	0	0	0
Settlements		0	0	0	0
Transfer into Level 3	[1]	0	0	0	0
Transfer out of Level 3	[1]	0	0	0	0
Ending balance		34	38	34	38
Total gains (losses) included in net income attributable to assets still held		0	0	0	0
Total gains (losses) included in OCI attributable to assets still held		(1)	(3)	0	(6)
Fixed maturity securities | U.S. corporate | Consumer-cyclical
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning balance		127	127	113	137
Total realized and unrealized gains (losses) included in net income, assets		0	0	0	0
Total realized and unrealized gains (losses), Included in OCI		(2)	(7)	0	(15)
Purchases		1	0	1	0
Sales		0	0	0	0
Issuances		0	0	0	0
Settlements		(2)	(1)	(3)	(3)
Transfer into Level 3	[1]	0	0	13	0
Transfer out of Level 3	[1]	0	0	0	0
Ending balance		124	119	124	119
Total gains (losses) included in net income attributable to assets still held		0	0	0	0
Total gains (losses) included in OCI attributable to assets still held		(2)	(7)	0	(15)
Fixed maturity securities | U.S. corporate | Transportation
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning balance		24	64	43	64
Total realized and unrealized gains (losses) included in net income, assets		0	0	0	0
Total realized and unrealized gains (losses), Included in OCI		(1)	(3)	0	(6)
Purchases		0	0	0	5
Sales		0	0	0	0
Issuances		0	0	0	0
Settlements		0	(1)	(20)	(3)
Transfer into Level 3	[1]	0	0	0	0
Transfer out of Level 3	[1]	0	(4)	0	(4)
Ending balance		23	56	23	56
Total gains (losses) included in net income attributable to assets still held		0	0	0	0
Total gains (losses) included in OCI attributable to assets still held		0	(3)	0	(6)
Fixed maturity securities | U.S. corporate | Other
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning balance		156	222	159	254
Total realized and unrealized gains (losses) included in net income, assets		0	0	0	0
Total realized and unrealized gains (losses), Included in OCI		1	(12)	1	(23)
Purchases		0	0	0	0
Sales		0	0	0	0
Issuances		0	0	0	0
Settlements		(4)	(3)	(7)	(7)
Transfer into Level 3	[1]	0	0	0	0
Transfer out of Level 3	[1]	0	0	0	(17)
Ending balance		153	207	153	207
Total gains (losses) included in net income attributable to assets still held		0	0	0	0
Total gains (losses) included in OCI attributable to assets still held		1	(12)	1	(22)
Fixed maturity securities | Non-U.S. corporate
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning balance		827	1,040	885	1,162
Total realized and unrealized gains (losses) included in net income, assets		2	1	4	2
Total realized and unrealized gains (losses), Included in OCI		(20)	(70)	6	(145)
Purchases		1	3	30	13
Sales		0	(10)	(18)	(10)
Issuances		0	0	0	0
Settlements		(1)	(1)	(98)	(63)
Transfer into Level 3	[1]	30	11	30	28
Transfer out of Level 3	[1]	0	(1)	0	(14)
Ending balance		839	973	839	973
Total gains (losses) included in net income attributable to assets still held		2	1	3	2
Total gains (losses) included in OCI attributable to assets still held		(19)	(70)	(1)	(143)
Fixed maturity securities | Non-U.S. corporate | Utilities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning balance		298	334	295	345
Total realized and unrealized gains (losses) included in net income, assets		0	0	0	0
Total realized and unrealized gains (losses), Included in OCI		(9)	(25)	(4)	(46)
Purchases		1	0	4	10
Sales		0	0	0	0
Issuances		0	0	0	0
Settlements		0	0	(5)	0
Transfer into Level 3	[1]	30	0	30	0
Transfer out of Level 3	[1]	0	0	0	0
Ending balance		320	309	320	309
Total gains (losses) included in net income attributable to assets still held		0	0	0	0
Total gains (losses) included in OCI attributable to assets still held		(8)	(24)	(3)	(45)
Fixed maturity securities | Non-U.S. corporate | Energy
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning balance		119	138	118	145
Total realized and unrealized gains (losses) included in net income, assets		0	0	0	0
Total realized and unrealized gains (losses), Included in OCI		(2)	(7)	0	(14)
Purchases		0	3	0	3
Sales		0	0	0	0
Issuances		0	0	0	0
Settlements		0	(1)	(1)	(1)
Transfer into Level 3	[1]	0	0	0	0
Transfer out of Level 3	[1]	0	0	0	0
Ending balance		117	133	117	133
Total gains (losses) included in net income attributable to assets still held		0	0	0	0
Total gains (losses) included in OCI attributable to assets still held		(2)	(8)	0	(15)
Fixed maturity securities | Non-U.S. corporate | Finance and insurance
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning balance		131	143	125	160
Total realized and unrealized gains (losses) included in net income, assets		2	1	3	2
Total realized and unrealized gains (losses), Included in OCI		(7)	(12)	(2)	(30)
Purchases		0	0	0	0
Sales		0	0	0	0
Issuances		0	0	0	0
Settlements		0	0	0	0
Transfer into Level 3	[1]	0	0	0	0
Transfer out of Level 3	[1]	0	0	0	0
Ending balance		126	132	126	132
Total gains (losses) included in net income attributable to assets still held		2	1	3	2
Total gains (losses) included in OCI attributable to assets still held		(6)	(12)	(2)	(30)
Fixed maturity securities | Non-U.S. corporate | Consumer-non-cyclical
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning balance		73	60	73	63
Total realized and unrealized gains (losses) included in net income, assets		0	0	0	0
Total realized and unrealized gains (losses), Included in OCI		0	(4)	0	(7)
Purchases		0	0	0	0
Sales		0	0	0	0
Issuances		0	0	0	0
Settlements		0	0	0	0
Transfer into Level 3	[1]	0	11	0	11
Transfer out of Level 3	[1]	0	0	0	0
Ending balance		73	67	73	67
Total gains (losses) included in net income attributable to assets still held		0	0	0	0
Total gains (losses) included in OCI attributable to assets still held		(1)	(4)	0	(7)
Fixed maturity securities | Non-U.S. corporate | Technology and communications
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning balance		26	27	26	28
Total realized and unrealized gains (losses) included in net income, assets		0	0	0	0
Total realized and unrealized gains (losses), Included in OCI		0	(1)	0	(2)
Purchases		0	0	0	0
Sales		0	0	0	0
Issuances		0	0	0	0
Settlements		0	0	0	0
Transfer into Level 3	[1]	0	0	0	0
Transfer out of Level 3	[1]	0	0	0	0
Ending balance		26	26	26	26
Total gains (losses) included in net income attributable to assets still held		0	0	0	0
Total gains (losses) included in OCI attributable to assets still held		0	(1)	0	(2)
Fixed maturity securities | Non-U.S. corporate | Industrial
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning balance		75	74	48	93
Total realized and unrealized gains (losses) included in net income, assets		0	0	0	0
Total realized and unrealized gains (losses), Included in OCI		0	(4)	2	(10)
Purchases		0	0	25	0
Sales		0	0	0	0
Issuances		0	0	0	0
Settlements		0	0	0	0
Transfer into Level 3	[1]	0	0	0	0
Transfer out of Level 3	[1]	0	(1)	0	(14)
Ending balance		75	69	75	69
Total gains (losses) included in net income attributable to assets still held		0	0	0	0
Total gains (losses) included in OCI attributable to assets still held		(1)	(5)	1	(9)
Fixed maturity securities | Non-U.S. corporate | Capital goods
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning balance		52	132	95	173
Total realized and unrealized gains (losses) included in net income, assets		0	0	1	0
Total realized and unrealized gains (losses), Included in OCI		(1)	(7)	3	(15)
Purchases		0	0	0	0
Sales		0	(10)	(12)	(10)
Issuances		0	0	0	0
Settlements		0	0	(36)	(33)
Transfer into Level 3	[1]	0	0	0	0
Transfer out of Level 3	[1]	0	0	0	0
Ending balance		51	115	51	115
Total gains (losses) included in net income attributable to assets still held		0	0	0	0
Total gains (losses) included in OCI attributable to assets still held		0	(7)	2	(15)
Fixed maturity securities | Non-U.S. corporate | Consumer-cyclical
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning balance		9	86	64	76
Total realized and unrealized gains (losses) included in net income, assets		0	0	0	0
Total realized and unrealized gains (losses), Included in OCI		1	(7)	7	(14)
Purchases		0	0	0	0
Sales		0	0	(6)	0
Issuances		0	0	0	0
Settlements		(1)	0	(56)	0
Transfer into Level 3	[1]	0	0	0	17
Transfer out of Level 3	[1]	0	0	0	0
Ending balance		9	79	9	79
Total gains (losses) included in net income attributable to assets still held		0	0	0	0
Total gains (losses) included in OCI attributable to assets still held		0	(7)	1	(14)
Fixed maturity securities | Non-U.S. corporate | Transportation
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning balance		22	22	20	53
Total realized and unrealized gains (losses) included in net income, assets		0	0	0	0
Total realized and unrealized gains (losses), Included in OCI		(1)	(1)	0	(3)
Purchases		0	0	1	0
Sales		0	0	0	0
Issuances		0	0	0	0
Settlements		0	0	0	(29)
Transfer into Level 3	[1]	0	0	0	0
Transfer out of Level 3	[1]	0	0	0	0
Ending balance		21	21	21	21
Total gains (losses) included in net income attributable to assets still held		0	0	0	0
Total gains (losses) included in OCI attributable to assets still held		(1)	(1)	0	(3)
Fixed maturity securities | Non-U.S. corporate | Other
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning balance		22	24	21	26
Total realized and unrealized gains (losses) included in net income, assets		0	0	0	0
Total realized and unrealized gains (losses), Included in OCI		(1)	(2)	0	(4)
Purchases		0	0	0	0
Sales		0	0	0	0
Issuances		0	0	0	0
Settlements		0	0	0	0
Transfer into Level 3	[1]	0	0	0	0
Transfer out of Level 3	[1]	0	0	0	0
Ending balance		21	22	21	22
Total gains (losses) included in net income attributable to assets still held		0	0	0	0
Total gains (losses) included in OCI attributable to assets still held		0	(1)	0	(3)
Fixed maturity securities | Residential mortgage-backed
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning balance		8	33	22	27
Total realized and unrealized gains (losses) included in net income, assets		0	0	0	0
Total realized and unrealized gains (losses), Included in OCI		1	(2)	2	(3)
Purchases		0	4	0	13
Sales		0	0	0	0
Issuances		0	0	0	0
Settlements		(1)	(1)	(1)	(2)
Transfer into Level 3	[1]	0	0	0	4
Transfer out of Level 3	[1]	0	(4)	(15)	(9)
Ending balance		8	30	8	30
Total gains (losses) included in net income attributable to assets still held		0	0	0	0
Total gains (losses) included in OCI attributable to assets still held		0	(2)	0	(2)
Fixed maturity securities | Commercial mortgage-backed
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning balance		12	15	12	16
Total realized and unrealized gains (losses) included in net income, assets		0	0	0	0
Total realized and unrealized gains (losses), Included in OCI		0	(1)	0	(2)
Purchases		0	0	0	0
Sales		(1)	0	(1)	0
Issuances		0	0	0	0
Settlements		0	0	0	0
Transfer into Level 3	[1]	0	0	0	0
Transfer out of Level 3	[1]	0	0	0	0
Ending balance		11	14	11	14
Total gains (losses) included in net income attributable to assets still held		0	0	0	0
Total gains (losses) included in OCI attributable to assets still held		0	(2)	0	(3)
Fixed maturity securities | Other asset-backed
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning balance		95	100	94	138
Total realized and unrealized gains (losses) included in net income, assets		0	0	0	0
Total realized and unrealized gains (losses), Included in OCI		(1)	(5)	1	(12)
Purchases		10	40	12	46
Sales		0	(6)	0	(6)
Issuances		0	0	0	0
Settlements		0	0	(1)	(3)
Transfer into Level 3	[1]	0	0	0	0
Transfer out of Level 3	[1]	0	0	(2)	(34)
Ending balance		104	129	104	129
Total gains (losses) included in net income attributable to assets still held		0	0	0	0
Total gains (losses) included in OCI attributable to assets still held		(1)	(5)	1	(10)
Fixed maturity securities | Non-U.S. government
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning balance			1		2
Total realized and unrealized gains (losses) included in net income, assets			0		0
Total realized and unrealized gains (losses), Included in OCI			0		0
Purchases			2		2
Sales			0		(1)
Issuances			0		0
Settlements			0		0
Transfer into Level 3	[1]		0		0
Transfer out of Level 3	[1]		0		0
Ending balance			3		3
Total gains (losses) included in net income attributable to assets still held			0		0
Total gains (losses) included in OCI attributable to assets still held			0		0
Equity Securities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning balance		33	36	34	37
Total realized and unrealized gains (losses) included in net income, assets		0	0	0	0
Total realized and unrealized gains (losses), Included in OCI		0	0	0	0
Purchases		1	0	1	0
Sales		(4)	(1)	(5)	(1)
Issuances		0	0	0	0
Settlements		0	0	0	0
Transfer into Level 3	[1]	0	0	0	0
Transfer out of Level 3	[1]	0	0	0	(1)
Ending balance		30	35	30	35
Total gains (losses) included in net income attributable to assets still held		0	0	0	0
Total gains (losses) included in OCI attributable to assets still held		0	0	0	0
Limited Partnerships
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning balance		22	26	24	26
Total realized and unrealized gains (losses) included in net income, assets		(1)	(3)	(3)	(3)
Total realized and unrealized gains (losses), Included in OCI		0	0	0	0
Purchases		0	0	0	0
Sales		0	0	0	0
Issuances		0	0	0	0
Settlements		0	0	0	0
Transfer into Level 3	[1]	0	0	0	0
Transfer out of Level 3	[1]	0	0	0	0
Ending balance		21	23	21	23
Total gains (losses) included in net income attributable to assets still held		(1)	(3)	(3)	(3)
Total gains (losses) included in OCI attributable to assets still held		$ 0	$ 0	$ 0	$ 0

[1] The transfers into and out of Level 3 for fixed maturity securities were related to changes in the primary pricing source and changes in the observability of external information used in determining the fair value, such as external ratings or credit spreads, as well as changes in the industry sectors assigned to specific securities.