Investments (excluding Consolidated Investment Entities) - Unrealized Capital Losses (Details) - USD ($) $ in Millions	Jun. 30, 2025	Dec. 31, 2024
Available-for-sale Securities, Including Securities Pledged [Line Items]
Twelve months or less below amortized cost, Fair Value	$ 2,644	$ 3,057
Twelve months or less below amortized cost, Unrealized Capital Loss	100	107
More than twelve months below amortized cost, Fair Value	14,035	14,784
More than twelve months below amortized cost, Unrealized Capital Loss	2,315	2,739
Total, Fair Value	16,679	17,841
Total Unrealized Capital Losses	$ 2,415	2,846
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]
Twelve months or less below amortized cost, Fair Value	$ 344	304
Twelve months or less below amortized cost, Unrealized Capital Loss	18	20
More than twelve months below amortized cost, Fair Value	135	133
More than twelve months below amortized cost, Unrealized Capital Loss	31	32
Total, Fair Value	479	437
Total Unrealized Capital Losses	49	52
U.S. Government agencies and authorities
Available-for-sale Securities, Including Securities Pledged [Line Items]
Twelve months or less below amortized cost, Fair Value	0	14
Twelve months or less below amortized cost, Unrealized Capital Loss	0	0
More than twelve months below amortized cost, Fair Value	0	0
More than twelve months below amortized cost, Unrealized Capital Loss	0	0
Total, Fair Value	0	14
Total Unrealized Capital Losses	0	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	7
Twelve months or less below amortized cost, Unrealized Capital Loss	0	0
More than twelve months below amortized cost, Fair Value	495	562
More than twelve months below amortized cost, Unrealized Capital Loss	107	117
Total, Fair Value	499	569
Total Unrealized Capital Losses	107	117
U.S. corporate public securities
Available-for-sale Securities, Including Securities Pledged [Line Items]
Twelve months or less below amortized cost, Fair Value	819	818
Twelve months or less below amortized cost, Unrealized Capital Loss	60	35
More than twelve months below amortized cost, Fair Value	4,111	4,215
More than twelve months below amortized cost, Unrealized Capital Loss	926	1,019
Total, Fair Value	4,930	5,033
Total Unrealized Capital Losses	986	1,054
U.S. corporate private securities
Available-for-sale Securities, Including Securities Pledged [Line Items]
Twelve months or less below amortized cost, Fair Value	362	546
Twelve months or less below amortized cost, Unrealized Capital Loss	4	13
More than twelve months below amortized cost, Fair Value	2,663	2,845
More than twelve months below amortized cost, Unrealized Capital Loss	234	316
Total, Fair Value	3,025	3,391
Total Unrealized Capital Losses	238	329
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	422	450
Twelve months or less below amortized cost, Unrealized Capital Loss	11	17
More than twelve months below amortized cost, Fair Value	1,223	1,285
More than twelve months below amortized cost, Unrealized Capital Loss	239	270
Total, Fair Value	1,645	1,735
Total Unrealized Capital Losses	250	287
Foreign corporate private securities
Available-for-sale Securities, Including Securities Pledged [Line Items]
Twelve months or less below amortized cost, Fair Value	239	490
Twelve months or less below amortized cost, Unrealized Capital Loss	2	12
More than twelve months below amortized cost, Fair Value	1,330	1,468
More than twelve months below amortized cost, Unrealized Capital Loss	68	157
Total, Fair Value	1,569	1,958
Total Unrealized Capital Losses	70	169
Residential mortgage-backed
Available-for-sale Securities, Including Securities Pledged [Line Items]
Twelve months or less below amortized cost, Fair Value	194	311
Twelve months or less below amortized cost, Unrealized Capital Loss	2	8
More than twelve months below amortized cost, Fair Value	1,202	1,210
More than twelve months below amortized cost, Unrealized Capital Loss	221	253
Total, Fair Value	1,396	1,521
Total Unrealized Capital Losses	223	261
Commercial mortgage-backed securities
Available-for-sale Securities, Including Securities Pledged [Line Items]
Twelve months or less below amortized cost, Fair Value	96	24
Twelve months or less below amortized cost, Unrealized Capital Loss	1	0
More than twelve months below amortized cost, Fair Value	2,567	2,751
More than twelve months below amortized cost, Unrealized Capital Loss	453	532
Total, Fair Value	2,663	2,775
Total Unrealized Capital Losses	454	532
Other asset-backed securities
Available-for-sale Securities, Including Securities Pledged [Line Items]
Twelve months or less below amortized cost, Fair Value	164	93
Twelve months or less below amortized cost, Unrealized Capital Loss	2	2
More than twelve months below amortized cost, Fair Value	309	315
More than twelve months below amortized cost, Unrealized Capital Loss	36	43
Total, Fair Value	473	408
Total Unrealized Capital Losses	$ 38	$ 45

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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