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Investments (excluding Consolidated Investment Entities) - Unrealized Capital Losses (Details) - USD ($)
$ in Millions
Mar. 31, 2025
Dec. 31, 2024
Available-for-sale Securities, Including Securities Pledged [Line Items]    
Twelve months or less below amortized cost, Fair Value $ 3,523 $ 3,057
Twelve months or less below amortized cost, Unrealized Capital Loss 88 107
More than twelve months below amortized cost, Fair Value 14,773 14,784
More than twelve months below amortized cost, Unrealized Capital Loss 2,436 2,739
Total, Fair Value 18,296 17,841
Total Unrealized Capital Losses $ 2,524 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 $ 254 304
Twelve months or less below amortized cost, Unrealized Capital Loss 11 20
More than twelve months below amortized cost, Fair Value 138 133
More than twelve months below amortized cost, Unrealized Capital Loss 27 32
Total, Fair Value 392 437
Total Unrealized Capital Losses 38 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 515 562
More than twelve months below amortized cost, Unrealized Capital Loss 102 117
Total, Fair Value 519 569
Total Unrealized Capital Losses 102 117
U.S. corporate public securities    
Available-for-sale Securities, Including Securities Pledged [Line Items]    
Twelve months or less below amortized cost, Fair Value 876 818
Twelve months or less below amortized cost, Unrealized Capital Loss 45 35
More than twelve months below amortized cost, Fair Value 4,258 4,215
More than twelve months below amortized cost, Unrealized Capital Loss 944 1,019
Total, Fair Value 5,134 5,033
Total Unrealized Capital Losses 989 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 412 546
Twelve months or less below amortized cost, Unrealized Capital Loss 5 13
More than twelve months below amortized cost, Fair Value 2,951 2,845
More than twelve months below amortized cost, Unrealized Capital Loss 274 316
Total, Fair Value 3,363 3,391
Total Unrealized Capital Losses 279 329
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 525 450
Twelve months or less below amortized cost, Unrealized Capital Loss 12 17
More than twelve months below amortized cost, Fair Value 1,282 1,285
More than twelve months below amortized cost, Unrealized Capital Loss 249 270
Total, Fair Value 1,807 1,735
Total Unrealized Capital Losses 261 287
Foreign corporate private securities    
Available-for-sale Securities, Including Securities Pledged [Line Items]    
Twelve months or less below amortized cost, Fair Value 521 490
Twelve months or less below amortized cost, Unrealized Capital Loss 5 12
More than twelve months below amortized cost, Fair Value 1,457 1,468
More than twelve months below amortized cost, Unrealized Capital Loss 116 157
Total, Fair Value 1,978 1,958
Total Unrealized Capital Losses 121 169
Residential mortgage-backed    
Available-for-sale Securities, Including Securities Pledged [Line Items]    
Twelve months or less below amortized cost, Fair Value 257 311
Twelve months or less below amortized cost, Unrealized Capital Loss 4 8
More than twelve months below amortized cost, Fair Value 1,228 1,210
More than twelve months below amortized cost, Unrealized Capital Loss 220 253
Total, Fair Value 1,485 1,521
Total Unrealized Capital Losses 224 261
Commercial mortgage-backed securities    
Available-for-sale Securities, Including Securities Pledged [Line Items]    
Twelve months or less below amortized cost, Fair Value 90 24
Twelve months or less below amortized cost, Unrealized Capital Loss 0 0
More than twelve months below amortized cost, Fair Value 2,639 2,751
More than twelve months below amortized cost, Unrealized Capital Loss 467 532
Total, Fair Value 2,729 2,775
Total Unrealized Capital Losses 467 532
Other asset-backed securities    
Available-for-sale Securities, Including Securities Pledged [Line Items]    
Twelve months or less below amortized cost, Fair Value 584 93
Twelve months or less below amortized cost, Unrealized Capital Loss 6 2
More than twelve months below amortized cost, Fair Value 305 315
More than twelve months below amortized cost, Unrealized Capital Loss 37 43
Total, Fair Value 889 408
Total Unrealized Capital Losses $ 43 $ 45