Investments (excluding Consolidated Investment Entities) - Unrealized Capital Losses (Details) - USD ($) $ in Millions	Mar. 31, 2026	Dec. 31, 2025
Available-for-sale Securities, Including Securities Pledged [Line Items]
Twelve months or less below amortized cost, Fair Value	$ 5,597	$ 1,980
Twelve months or less below amortized cost, Unrealized Capital Loss	127	61
More than twelve months below amortized cost, Fair Value	12,297	13,438
More than twelve months below amortized cost, Unrealized Capital Loss	2,233	2,098
Total, Fair Value	17,894	15,418
Total Unrealized Capital Losses	2,360	2,159
U.S. Treasuries
Available-for-sale Securities, Including Securities Pledged [Line Items]
Twelve months or less below amortized cost, Fair Value	282	257
Twelve months or less below amortized cost, Unrealized Capital Loss	7	4
More than twelve months below amortized cost, Fair Value	287	291
More than twelve months below amortized cost, Unrealized Capital Loss	51	47
Total, Fair Value	569	548
Total Unrealized Capital Losses	58	51
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	450	493
More than twelve months below amortized cost, Unrealized Capital Loss	95	96
Total, Fair Value	454	497
Total Unrealized Capital Losses	95	96
U.S. corporate public securities
Available-for-sale Securities, Including Securities Pledged [Line Items]
Twelve months or less below amortized cost, Fair Value	1,445	568
Twelve months or less below amortized cost, Unrealized Capital Loss	68	42
More than twelve months below amortized cost, Fair Value	4,136	4,282
More than twelve months below amortized cost, Unrealized Capital Loss	951	871
Total, Fair Value	5,581	4,850
Total Unrealized Capital Losses	1,019	913
U.S. corporate private securities
Available-for-sale Securities, Including Securities Pledged [Line Items]
Twelve months or less below amortized cost, Fair Value	1,071	348
Twelve months or less below amortized cost, Unrealized Capital Loss	17	4
More than twelve months below amortized cost, Fair Value	2,100	2,334
More than twelve months below amortized cost, Unrealized Capital Loss	222	199
Total, Fair Value	3,171	2,682
Total Unrealized Capital Losses	239	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	665	163
Twelve months or less below amortized cost, Unrealized Capital Loss	12	4
More than twelve months below amortized cost, Fair Value	1,091	1,247
More than twelve months below amortized cost, Unrealized Capital Loss	227	211
Total, Fair Value	1,756	1,410
Total Unrealized Capital Losses	239	215
Foreign corporate private securities
Available-for-sale Securities, Including Securities Pledged [Line Items]
Twelve months or less below amortized cost, Fair Value	667	70
Twelve months or less below amortized cost, Unrealized Capital Loss	7	1
More than twelve months below amortized cost, Fair Value	960	1,118
More than twelve months below amortized cost, Unrealized Capital Loss	57	48
Total, Fair Value	1,627	1,188
Total Unrealized Capital Losses	64	49
Residential mortgage-backed
Available-for-sale Securities, Including Securities Pledged [Line Items]
Twelve months or less below amortized cost, Fair Value	595	244
Twelve months or less below amortized cost, Unrealized Capital Loss	7	2
More than twelve months below amortized cost, Fair Value	997	1,170
More than twelve months below amortized cost, Unrealized Capital Loss	200	198
Total, Fair Value	1,592	1,414
Total Unrealized Capital Losses	207	200
Commercial mortgage-backed securities
Available-for-sale Securities, Including Securities Pledged [Line Items]
Twelve months or less below amortized cost, Fair Value	96	75
Twelve months or less below amortized cost, Unrealized Capital Loss	0	1
More than twelve months below amortized cost, Fair Value	2,034	2,243
More than twelve months below amortized cost, Unrealized Capital Loss	402	400
Total, Fair Value	2,130	2,318
Total Unrealized Capital Losses	402	401
Other asset-backed securities
Available-for-sale Securities, Including Securities Pledged [Line Items]
Twelve months or less below amortized cost, Fair Value	772	251
Twelve months or less below amortized cost, Unrealized Capital Loss	9	3
More than twelve months below amortized cost, Fair Value	242	260
More than twelve months below amortized cost, Unrealized Capital Loss	28	28
Total, Fair Value	1,014	511
Total Unrealized Capital Losses	$ 37	$ 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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