Investments - Unrealized Capital Losses (Details) - USD ($) $ in Millions	Jun. 30, 2026	Dec. 31, 2025
Available-for-sale Securities Including Securities Pledged [Line Items]
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months	$ 4,299	$ 1,682
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	94	46
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	9,356	10,481
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	1,605	1,574
Debt Securities, Available-for-sale, Unrealized Loss Position	13,655	12,163
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	$ 1,699	1,620
Minimum
Available-for-sale Securities Including Securities Pledged [Line Items]
Fixed Maturities Average Duration	6 years
Maximum
Available-for-sale Securities Including Securities Pledged [Line Items]
Fixed Maturities Average Duration	6 years 6 months
U.S. Treasuries
Available-for-sale Securities Including Securities Pledged [Line Items]
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months	$ 273	212
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	7	4
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	255	252
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	47	43
Debt Securities, Available-for-sale, Unrealized Loss Position	528	464
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	54	47
US Government Agencies Debt Securities
Available-for-sale Securities Including Securities Pledged [Line Items]
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months	14	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	14	14
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	1	1
Debt Securities, Available-for-sale, Unrealized Loss Position	28	14
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	1	1
State, municipalities and political subdivisions
Available-for-sale Securities Including Securities Pledged [Line Items]
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months	4	3
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	312	354
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	64	68
Debt Securities, Available-for-sale, Unrealized Loss Position	316	357
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	64	68
Debt Security, Corporate, US
Available-for-sale Securities Including Securities Pledged [Line Items]
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months	975	516
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	42	32
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	3,534	3,655
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	766	741
Debt Securities, Available-for-sale, Unrealized Loss Position	4,509	4,171
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	808	773
Private Equity Funds, US
Available-for-sale Securities Including Securities Pledged [Line Items]
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months	1,062	298
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	16	4
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	1,561	1,857
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	170	161
Debt Securities, Available-for-sale, Unrealized Loss Position	2,623	2,155
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	186	165
Foreign corporate public securities and foreign governments
Available-for-sale Securities Including Securities Pledged [Line Items]
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months	396	136
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	6	3
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	935	1,040
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	175	174
Debt Securities, Available-for-sale, Unrealized Loss Position	1,331	1,176
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	181	177
Private Equity Funds, Non-US
Available-for-sale Securities Including Securities Pledged [Line Items]
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months	575	62
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	8	0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	721	919
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	43	39
Debt Securities, Available-for-sale, Unrealized Loss Position	1,296	981
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	51	39
Residential mortgage-backed
Available-for-sale Securities Including Securities Pledged [Line Items]
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months	468	206
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	7	2
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	532	686
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	91	90
Debt Securities, Available-for-sale, Unrealized Loss Position	1,000	892
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	98	92
Commercial mortgage-backed
Available-for-sale Securities Including Securities Pledged [Line Items]
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months	83	61
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	1	0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	1,361	1,546
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	233	241
Debt Securities, Available-for-sale, Unrealized Loss Position	1,444	1,607
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	234	241
Other asset-backed securities
Available-for-sale Securities Including Securities Pledged [Line Items]
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months	449	188
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	7	1
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	131	158
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	15	16
Debt Securities, Available-for-sale, Unrealized Loss Position	580	346
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	$ 22	$ 17

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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