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Investments (excluding Consolidated Investment Entities) - Unrealized Capital Losses (Details) - USD ($)
$ in Millions
Sep. 30, 2025
Dec. 31, 2024
Available-for-sale Securities, Including Securities Pledged [Line Items]    
Twelve months or less below amortized cost, Fair Value $ 1,566 $ 3,057
Twelve months or less below amortized cost, Unrealized Capital Loss 52 107
More than twelve months below amortized cost, Fair Value 13,555 14,784
More than twelve months below amortized cost, Unrealized Capital Loss 2,090 2,739
Total, Fair Value 15,121 17,841
Total Unrealized Capital Losses 2,142 2,846
U.S. Treasuries    
Available-for-sale Securities, Including Securities Pledged [Line Items]    
Twelve months or less below amortized cost, Fair Value 140 304
Twelve months or less below amortized cost, Unrealized Capital Loss 3 20
More than twelve months below amortized cost, Fair Value 262 133
More than twelve months below amortized cost, Unrealized Capital Loss 40 32
Total, Fair Value 402 437
Total Unrealized Capital Losses 43 52
US Government Agencies Debt Securities    
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 6 7
Twelve months or less below amortized cost, Unrealized Capital Loss 1 0
More than twelve months below amortized cost, Fair Value 500 562
More than twelve months below amortized cost, Unrealized Capital Loss 95 117
Total, Fair Value 506 569
Total Unrealized Capital Losses 96 117
U.S. corporate public securities    
Available-for-sale Securities, Including Securities Pledged [Line Items]    
Twelve months or less below amortized cost, Fair Value 518 818
Twelve months or less below amortized cost, Unrealized Capital Loss 34 35
More than twelve months below amortized cost, Fair Value 4,135 4,215
More than twelve months below amortized cost, Unrealized Capital Loss 830 1,019
Total, Fair Value 4,653 5,033
Total Unrealized Capital Losses 864 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 205 546
Twelve months or less below amortized cost, Unrealized Capital Loss 4 13
More than twelve months below amortized cost, Fair Value 2,494 2,845
More than twelve months below amortized cost, Unrealized Capital Loss 201 316
Total, Fair Value 2,699 3,391
Total Unrealized Capital Losses 205 329
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 167 450
Twelve months or less below amortized cost, Unrealized Capital Loss 3 17
More than twelve months below amortized cost, Fair Value 1,201 1,285
More than twelve months below amortized cost, Unrealized Capital Loss 204 270
Total, Fair Value 1,368 1,735
Total Unrealized Capital Losses 207 287
Foreign corporate private securities    
Available-for-sale Securities, Including Securities Pledged [Line Items]    
Twelve months or less below amortized cost, Fair Value 73 490
Twelve months or less below amortized cost, Unrealized Capital Loss 1 12
More than twelve months below amortized cost, Fair Value 1,181 1,468
More than twelve months below amortized cost, Unrealized Capital Loss 54 157
Total, Fair Value 1,254 1,958
Total Unrealized Capital Losses 55 169
Residential mortgage-backed    
Available-for-sale Securities, Including Securities Pledged [Line Items]    
Twelve months or less below amortized cost, Fair Value 256 311
Twelve months or less below amortized cost, Unrealized Capital Loss 3 8
More than twelve months below amortized cost, Fair Value 1,189 1,210
More than twelve months below amortized cost, Unrealized Capital Loss 205 253
Total, Fair Value 1,445 1,521
Total Unrealized Capital Losses 208 261
Commercial mortgage-backed securities    
Available-for-sale Securities, Including Securities Pledged [Line Items]    
Twelve months or less below amortized cost, Fair Value 64 24
Twelve months or less below amortized cost, Unrealized Capital Loss 1 0
More than twelve months below amortized cost, Fair Value 2,302 2,751
More than twelve months below amortized cost, Unrealized Capital Loss 429 532
Total, Fair Value 2,366 2,775
Total Unrealized Capital Losses 430 532
Other asset-backed securities    
Available-for-sale Securities, Including Securities Pledged [Line Items]    
Twelve months or less below amortized cost, Fair Value 137 93
Twelve months or less below amortized cost, Unrealized Capital Loss 2 2
More than twelve months below amortized cost, Fair Value 291 315
More than twelve months below amortized cost, Unrealized Capital Loss 32 43
Total, Fair Value 428 408
Total Unrealized Capital Losses $ 34 $ 45