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Investments (Fair Value and Losses by Investment Category and Length of Time in a Loss Position) (Details) - Fixed Maturities [Member] - USD ($) $ in Millions	Sep. 30, 2023	Dec. 31, 2022
Estimated Fair Values And Gross Unrealized Losses, OTTI Impairment Losses Reported In AOCI [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	$ 11,883	$ 31,631
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	851	3,693
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	35,013	12,915
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	7,624	3,615
Debt Securities, Available-for-sale, Unrealized Loss Position, Total	46,896	44,546
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	8,475	7,308
Investment grade securities
Estimated Fair Values And Gross Unrealized Losses, OTTI Impairment Losses Reported In AOCI [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	11,522	30,773
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	780	3,598
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	34,028	12,408
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	7,452	3,485
Debt Securities, Available-for-sale, Unrealized Loss Position, Total	45,550	43,181
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	8,232	7,083
Non-investment grade securities
Estimated Fair Values And Gross Unrealized Losses, OTTI Impairment Losses Reported In AOCI [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	361	858
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	71	95
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	985	507
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	172	130
Debt Securities, Available-for-sale, Unrealized Loss Position, Total	1,346	1,365
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	243	225
Corporate Debt Securities [Member] | Investment grade securities
Estimated Fair Values And Gross Unrealized Losses, OTTI Impairment Losses Reported In AOCI [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	7,272	21,867
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	516	2,756
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	23,093	6,840
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	5,395	2,225
Debt Securities, Available-for-sale, Unrealized Loss Position, Total	30,365	28,707
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	5,911	4,981
Corporate Debt Securities [Member] | Non-investment grade securities
Estimated Fair Values And Gross Unrealized Losses, OTTI Impairment Losses Reported In AOCI [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	357	767
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	70	87
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	732	305
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	93	61
Debt Securities, Available-for-sale, Unrealized Loss Position, Total	1,089	1,072
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	163	148
Canadian and Canadian provincial governments | Investment grade securities
Estimated Fair Values And Gross Unrealized Losses, OTTI Impairment Losses Reported In AOCI [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	1,303	554
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	105	42
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	250	71
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	52	23
Debt Securities, Available-for-sale, Unrealized Loss Position, Total	1,553	625
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	157	65
Residential mortgage-backed securities | Investment grade securities
Estimated Fair Values And Gross Unrealized Losses, OTTI Impairment Losses Reported In AOCI [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	295	664
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	14	62
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	641	181
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	131	53
Debt Securities, Available-for-sale, Unrealized Loss Position, Total	936	845
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	145	115
Asset-backed Securities [Member] | Investment grade securities
Estimated Fair Values And Gross Unrealized Losses, OTTI Impairment Losses Reported In AOCI [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	471	1,596
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	18	153
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	3,071	1,931
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	299	269
Debt Securities, Available-for-sale, Unrealized Loss Position, Total	3,542	3,527
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	317	422
Asset-backed Securities [Member] | Non-investment grade securities
Estimated Fair Values And Gross Unrealized Losses, OTTI Impairment Losses Reported In AOCI [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	0	52
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	0	6
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	67	38
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	11	9
Debt Securities, Available-for-sale, Unrealized Loss Position, Total	67	90
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	11	15
Commercial mortgage-backed securities | Investment grade securities
Estimated Fair Values And Gross Unrealized Losses, OTTI Impairment Losses Reported In AOCI [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	273	1,314
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	12	144
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	1,358	281
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	232	65
Debt Securities, Available-for-sale, Unrealized Loss Position, Total	1,631	1,595
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	244	209
Commercial mortgage-backed securities | Non-investment grade securities
Estimated Fair Values And Gross Unrealized Losses, OTTI Impairment Losses Reported In AOCI [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	2
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	1
Debt Securities, Available-for-sale, Unrealized Loss Position, Total	2
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	1
US Government Agencies Debt Securities [Member] | Investment grade securities
Estimated Fair Values And Gross Unrealized Losses, OTTI Impairment Losses Reported In AOCI [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	488	1,202
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	28	64
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	559	253
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	258	148
Debt Securities, Available-for-sale, Unrealized Loss Position, Total	1,047	1,455
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	286	212
US States and Political Subdivisions Debt Securities [Member] | Investment grade securities
Estimated Fair Values And Gross Unrealized Losses, OTTI Impairment Losses Reported In AOCI [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	120	819
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	8	124
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	807	131
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	191	50
Debt Securities, Available-for-sale, Unrealized Loss Position, Total	927	950
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	199	174
Debt Security, Government, Non-US [Member] | Investment grade securities
Estimated Fair Values And Gross Unrealized Losses, OTTI Impairment Losses Reported In AOCI [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	686	1,942
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	29	167
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	2,194	1,026
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	451	260
Debt Securities, Available-for-sale, Unrealized Loss Position, Total	2,880	2,968
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	480	427
Debt Security, Government, Non-US [Member] | Non-investment grade securities
Estimated Fair Values And Gross Unrealized Losses, OTTI Impairment Losses Reported In AOCI [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	4	39
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	1	2
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	184	164
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	67	60
Debt Securities, Available-for-sale, Unrealized Loss Position, Total	188	203
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	68	62
JAPAN | Investment grade securities
Estimated Fair Values And Gross Unrealized Losses, OTTI Impairment Losses Reported In AOCI [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	614	815
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	50	86
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	2,055	1,694
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	443	392
Debt Securities, Available-for-sale, Unrealized Loss Position, Total	2,669	2,509
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	$ 493	$ 478

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