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Investments (Fair Value and Losses by Investment Category and Length of Time in a Loss Position) (Details) - USD ($) $ in Millions	Sep. 30, 2025	Dec. 31, 2024
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	$ 14,280	$ 21,494
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	475	828
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	31,508	28,394
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	6,037	5,556
Debt Securities, Available-for-sale, Unrealized Loss Position, Total	45,788	49,888
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	6,512	6,384
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	13,350	21,046
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	424	820
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	31,079	27,877
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	5,979	5,463
Debt Securities, Available-for-sale, Unrealized Loss Position, Total	44,429	48,923
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	6,403	6,283
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	930	448
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	51	8
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	429	517
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	58	93
Debt Securities, Available-for-sale, Unrealized Loss Position, Total	1,359	965
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	109	101
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	7,386	14,741
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	191	529
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	21,322	18,851
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	3,481	3,682
Debt Securities, Available-for-sale, Unrealized Loss Position, Total	28,708	33,592
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	3,672	4,211
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	918	347
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	47	7
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	294	347
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	31	50
Debt Securities, Available-for-sale, Unrealized Loss Position, Total	1,212	694
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	78	57
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	570	286
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	16	5
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	385	469
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	59	46
Debt Securities, Available-for-sale, Unrealized Loss Position, Total	955	755
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	75	51
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	0	354
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	0	7
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	617	593
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	77	100
Debt Securities, Available-for-sale, Unrealized Loss Position, Total	617	947
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	77	107
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	1,989	940
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	14	19
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	1,161	1,730
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	145	159
Debt Securities, Available-for-sale, Unrealized Loss Position, Total	3,150	2,670
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	159	178
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	12	101
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	4	1
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	0	40
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	0	5
Debt Securities, Available-for-sale, Unrealized Loss Position, Total	12	141
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	4	6
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	109	333
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	3	4
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	744	980
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	56	91
Debt Securities, Available-for-sale, Unrealized Loss Position, Total	853	1,313
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	59	95
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	0	792
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	0	15
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	642	656
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	246	266
Debt Securities, Available-for-sale, Unrealized Loss Position, Total	642	1,448
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	246	281
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	47	155
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	1	7
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	446	417
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	79	92
Debt Securities, Available-for-sale, Unrealized Loss Position, Total	493	572
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	80	99
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	1,900	1,408
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	44	42
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	1,978	1,816
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	347	344
Debt Securities, Available-for-sale, Unrealized Loss Position, Total	3,878	3,224
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	391	386
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	0	0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	0	0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	135	130
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	27	38
Debt Securities, Available-for-sale, Unrealized Loss Position, Total	135	130
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	27	38
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	1,349	2,037
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	155	192
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	3,784	2,365
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	1,489	683
Debt Securities, Available-for-sale, Unrealized Loss Position, Total	5,133	4,402
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	$ 1,644	$ 875

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