Investments (Fair Value and Losses by Investment Category and Length of Time in a Loss Position) (Details) - USD ($) $ in Millions	Sep. 30, 2026	Dec. 31, 2025
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	$ 61,713	$ 18,962
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	3,983	659
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	31,388	32,102
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	9,623	6,290
Debt Securities, Available-for-sale, Unrealized Loss Position, Total	93,101	51,064
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	13,606	6,949
Investment grade securities
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	60,232	18,291
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	3,895	633
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	31,016	31,831
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	9,545	6,256
Debt Securities, Available-for-sale, Unrealized Loss Position, Total	91,248	50,122
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	13,440	6,889
Non-investment grade securities
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	1,481	671
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	88	26
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	372	271
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	78	34
Debt Securities, Available-for-sale, Unrealized Loss Position, Total	1,853	942
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	166	60
Corporate Debt Securities [Member] \| Investment grade securities
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	43,408	10,591
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	3,046	255
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	21,002	22,666
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	5,590	3,635
Debt Securities, Available-for-sale, Unrealized Loss Position, Total	64,410	33,257
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	8,636	3,890
Corporate Debt Securities [Member] \| Non-investment grade securities
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	1,148	652
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	44	25
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	351	258
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	77	31
Debt Securities, Available-for-sale, Unrealized Loss Position, Total	1,499	910
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	121	56
Canadian and Canadian provincial governments \| Investment grade securities
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	2,310	1,096
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	154	34
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	533	426
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	127	72
Debt Securities, Available-for-sale, Unrealized Loss Position, Total	2,843	1,522
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	281	106
Residential mortgage-backed securities \| Investment grade securities
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	1,304	0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	56	0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	480	562
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	98	72
Debt Securities, Available-for-sale, Unrealized Loss Position, Total	1,784	562
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	154	72
Asset-backed Securities [Member] \| Investment grade securities
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	3,811	2,324
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	88	15
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	1,129	1,149
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	159	141
Debt Securities, Available-for-sale, Unrealized Loss Position, Total	4,940	3,473
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	247	156
Asset-backed Securities [Member] \| Non-investment grade securities
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	333	19
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	44	1
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	21	0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	1	0
Debt Securities, Available-for-sale, Unrealized Loss Position, Total	354	19
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	45	1
Commercial mortgage-backed securities \| Investment grade securities
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	1,600	0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	52	0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	533	705
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	46	50
Debt Securities, Available-for-sale, Unrealized Loss Position, Total	2,133	705
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	98	50
US Government Agencies Debt Securities [Member] \| Investment grade securities
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	1,655	406
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	47	1
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	436	542
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	295	247
Debt Securities, Available-for-sale, Unrealized Loss Position, Total	2,091	948
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	342	248
US States and Political Subdivisions Debt Securities [Member] \| Investment grade securities
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	242	73
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	22	1
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	359	451
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	106	78
Debt Securities, Available-for-sale, Unrealized Loss Position, Total	601	524
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	128	79
Debt Security, Government, Non-US [Member] \| Investment grade securities
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	2,916	1,382
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	170	26
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	1,781	1,901
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	472	350
Debt Securities, Available-for-sale, Unrealized Loss Position, Total	4,697	3,283
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	642	376
Debt Security, Government, Non-US [Member] \| Non-investment grade securities
Debt Securities, Available-for-sale [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	0	13
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	0	3
Debt Securities, Available-for-sale, Unrealized Loss Position, Total	0	13
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	0	3
JAPAN \| Investment grade securities
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	2,680	1,274
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	229	209
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	3,897	3,351
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	2,359	1,607
Debt Securities, Available-for-sale, Unrealized Loss Position, Total	6,577	4,625
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	2,588	1,816
Korean Government Debt Securities \| Investment grade securities
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	306	1,145
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	31	92
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	866	78
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	293	4
Debt Securities, Available-for-sale, Unrealized Loss Position, Total	1,172	1,223
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	$ 324	$ 96

Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for more than 12 months, without allowance for credit loss. Includes beneficial interest in securitized financial asset.

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