Investments (excluding Consolidated Investment Entities) - Unrealized Capital Losses (Details) - USD ($) $ in Millions	Jun. 30, 2026	Dec. 31, 2025
Available-for-sale Securities, Including Securities Pledged [Line Items]
Twelve months or less below amortized cost, Fair Value	$ 5,255	$ 1,980
Twelve months or less below amortized cost, Unrealized Capital Loss	117	61
More than twelve months below amortized cost, Fair Value	11,916	13,438
More than twelve months below amortized cost, Unrealized Capital Loss	2,138	2,098
Total, Fair Value	17,171	15,418
Total Unrealized Capital Losses	2,255	2,159
U.S. Treasuries
Available-for-sale Securities, Including Securities Pledged [Line Items]
Twelve months or less below amortized cost, Fair Value	310	257
Twelve months or less below amortized cost, Unrealized Capital Loss	8	4
More than twelve months below amortized cost, Fair Value	291	291
More than twelve months below amortized cost, Unrealized Capital Loss	52	47
Total, Fair Value	601	548
Total Unrealized Capital Losses	60	51
U.S. Government agencies and authorities
Available-for-sale Securities, Including Securities Pledged [Line Items]
Twelve months or less below amortized cost, Fair Value	15
Twelve months or less below amortized cost, Unrealized Capital Loss	0
More than twelve months below amortized cost, Fair Value	0
More than twelve months below amortized cost, Unrealized Capital Loss	0
Total, Fair Value	15
Total Unrealized Capital Losses	0
State, municipalities and political subdivisions
Available-for-sale Securities, Including Securities Pledged [Line Items]
Twelve months or less below amortized cost, Fair Value	4	4
Twelve months or less below amortized cost, Unrealized Capital Loss	0	0
More than twelve months below amortized cost, Fair Value	438	493
More than twelve months below amortized cost, Unrealized Capital Loss	92	96
Total, Fair Value	442	497
Total Unrealized Capital Losses	92	96
U.S. corporate public securities
Available-for-sale Securities, Including Securities Pledged [Line Items]
Twelve months or less below amortized cost, Fair Value	1,145	568
Twelve months or less below amortized cost, Unrealized Capital Loss	51	42
More than twelve months below amortized cost, Fair Value	4,105	4,282
More than twelve months below amortized cost, Unrealized Capital Loss	899	871
Total, Fair Value	5,250	4,850
Total Unrealized Capital Losses	950	913
U.S. corporate private securities
Available-for-sale Securities, Including Securities Pledged [Line Items]
Twelve months or less below amortized cost, Fair Value	1,300	348
Twelve months or less below amortized cost, Unrealized Capital Loss	20	4
More than twelve months below amortized cost, Fair Value	1,959	2,334
More than twelve months below amortized cost, Unrealized Capital Loss	210	199
Total, Fair Value	3,259	2,682
Total Unrealized Capital Losses	230	203
Foreign corporate public securities and foreign governments
Available-for-sale Securities, Including Securities Pledged [Line Items]
Twelve months or less below amortized cost, Fair Value	460	163
Twelve months or less below amortized cost, Unrealized Capital Loss	7	4
More than twelve months below amortized cost, Fair Value	1,086	1,247
More than twelve months below amortized cost, Unrealized Capital Loss	211	211
Total, Fair Value	1,546	1,410
Total Unrealized Capital Losses	218	215
Foreign corporate private securities
Available-for-sale Securities, Including Securities Pledged [Line Items]
Twelve months or less below amortized cost, Fair Value	679	70
Twelve months or less below amortized cost, Unrealized Capital Loss	9	1
More than twelve months below amortized cost, Fair Value	894	1,118
More than twelve months below amortized cost, Unrealized Capital Loss	54	48
Total, Fair Value	1,573	1,188
Total Unrealized Capital Losses	63	49
Residential mortgage-backed
Available-for-sale Securities, Including Securities Pledged [Line Items]
Twelve months or less below amortized cost, Fair Value	629	244
Twelve months or less below amortized cost, Unrealized Capital Loss	10	2
More than twelve months below amortized cost, Fair Value	967	1,170
More than twelve months below amortized cost, Unrealized Capital Loss	201	198
Total, Fair Value	1,596	1,414
Total Unrealized Capital Losses	211	200
Commercial mortgage-backed securities
Available-for-sale Securities, Including Securities Pledged [Line Items]
Twelve months or less below amortized cost, Fair Value	88	75
Twelve months or less below amortized cost, Unrealized Capital Loss	1	1
More than twelve months below amortized cost, Fair Value	1,957	2,243
More than twelve months below amortized cost, Unrealized Capital Loss	392	400
Total, Fair Value	2,045	2,318
Total Unrealized Capital Losses	393	401
Other asset-backed securities
Available-for-sale Securities, Including Securities Pledged [Line Items]
Twelve months or less below amortized cost, Fair Value	625	251
Twelve months or less below amortized cost, Unrealized Capital Loss	11	3
More than twelve months below amortized cost, Fair Value	219	260
More than twelve months below amortized cost, Unrealized Capital Loss	27	28
Total, Fair Value	844	511
Total Unrealized Capital Losses	$ 38	$ 31

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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