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Investments (excluding Consolidated Investment Entities) - Unrealized Capital Losses (Details) - USD ($)
$ in Millions
Jun. 30, 2024
Dec. 31, 2023
Available-for-sale Securities, Including Securities Pledged [Line Items]    
Twelve months or less below amortized cost, Fair Value $ 2,121 $ 1,221
Twelve months or less below amortized cost, Unrealized Capital Loss 47 42
More than twelve months below amortized cost, Fair Value 17,182 18,938
More than twelve months below amortized cost, Unrealized Capital Loss 2,896 2,680
Total, Fair Value 19,303 20,159
Total Unrealized Capital Losses $ 2,943 2,722
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 $ 146 99
Twelve months or less below amortized cost, Unrealized Capital Loss 2 3
More than twelve months below amortized cost, Fair Value 155 109
More than twelve months below amortized cost, Unrealized Capital Loss 29 18
Total, Fair Value 301 208
Total Unrealized Capital Losses 31 21
U.S. Government agencies and authorities    
Available-for-sale Securities, Including Securities Pledged [Line Items]    
Twelve months or less below amortized cost, Fair Value 14 0
Twelve months or less below amortized cost, Unrealized Capital Loss 0 0
More than twelve months below amortized cost, Fair Value 3 3
More than twelve months below amortized cost, Unrealized Capital Loss 2 1
Total, Fair Value 17 3
Total Unrealized Capital Losses 2 1
State, municipalities and political subdivisions    
Available-for-sale Securities, Including Securities Pledged [Line Items]    
Twelve months or less below amortized cost, Fair Value 3 20
Twelve months or less below amortized cost, Unrealized Capital Loss 0 0
More than twelve months below amortized cost, Fair Value 618 731
More than twelve months below amortized cost, Unrealized Capital Loss 113 101
Total, Fair Value 621 751
Total Unrealized Capital Losses 113 101
U.S. corporate public securities    
Available-for-sale Securities, Including Securities Pledged [Line Items]    
Twelve months or less below amortized cost, Fair Value 382 321
Twelve months or less below amortized cost, Unrealized Capital Loss 15 17
More than twelve months below amortized cost, Fair Value 4,782 5,101
More than twelve months below amortized cost, Unrealized Capital Loss 1,043 887
Total, Fair Value 5,164 5,422
Total Unrealized Capital Losses 1,058 904
U.S. corporate private securities    
Available-for-sale Securities, Including Securities Pledged [Line Items]    
Twelve months or less below amortized cost, Fair Value 527 176
Twelve months or less below amortized cost, Unrealized Capital Loss 14 7
More than twelve months below amortized cost, Fair Value 3,197 3,365
More than twelve months below amortized cost, Unrealized Capital Loss 377 317
Total, Fair Value 3,724 3,541
Total Unrealized Capital Losses 391 324
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 233 82
Twelve months or less below amortized cost, Unrealized Capital Loss 4 2
More than twelve months below amortized cost, Fair Value 1,554 1,749
More than twelve months below amortized cost, Unrealized Capital Loss 285 268
Total, Fair Value 1,787 1,831
Total Unrealized Capital Losses 289 270
Foreign corporate private securities    
Available-for-sale Securities, Including Securities Pledged [Line Items]    
Twelve months or less below amortized cost, Fair Value 245 189
Twelve months or less below amortized cost, Unrealized Capital Loss 5 5
More than twelve months below amortized cost, Fair Value 1,999 2,101
More than twelve months below amortized cost, Unrealized Capital Loss 159 124
Total, Fair Value 2,244 2,290
Total Unrealized Capital Losses 164 129
Residential mortgage-backed    
Available-for-sale Securities, Including Securities Pledged [Line Items]    
Twelve months or less below amortized cost, Fair Value 335 114
Twelve months or less below amortized cost, Unrealized Capital Loss 4 3
More than twelve months below amortized cost, Fair Value 1,329 1,354
More than twelve months below amortized cost, Unrealized Capital Loss 268 254
Total, Fair Value 1,664 1,468
Total Unrealized Capital Losses 272 257
Commercial mortgage-backed securities    
Available-for-sale Securities, Including Securities Pledged [Line Items]    
Twelve months or less below amortized cost, Fair Value 48 84
Twelve months or less below amortized cost, Unrealized Capital Loss 1 2
More than twelve months below amortized cost, Fair Value 3,158 3,269
More than twelve months below amortized cost, Unrealized Capital Loss 570 642
Total, Fair Value 3,206 3,353
Total Unrealized Capital Losses 571 644
Other asset-backed securities    
Available-for-sale Securities, Including Securities Pledged [Line Items]    
Twelve months or less below amortized cost, Fair Value 188 136
Twelve months or less below amortized cost, Unrealized Capital Loss 2 3
More than twelve months below amortized cost, Fair Value 387 1,156
More than twelve months below amortized cost, Unrealized Capital Loss 50 68
Total, Fair Value 575 1,292
Total Unrealized Capital Losses $ 52 $ 71