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Fair Value Measurements (excluding Consolidated Investment Entities) - Fair Value Measurement (Details) - USD ($)
$ in Millions
Dec. 31, 2025
Dec. 31, 2024
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets held in separate accounts $ 113,007 $ 101,676
Total assets 178,859 163,889
Derivatives 282 332
Total liabilities 171,820 157,882
Fixed maturities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fixed maturities, including securities pledged 30,151 27,454
Embedded Derivatives 1 (4)
U.S. Treasuries    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fixed maturities, including securities pledged 614 472
Embedded Derivatives 0 0
U.S. Government agencies and authorities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fixed maturities, including securities pledged 31 30
Embedded Derivatives 0 0
State, municipalities and political subdivisions    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fixed maturities, including securities pledged 510 580
Embedded Derivatives 0 0
U.S. corporate public securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fixed maturities, including securities pledged 7,864 7,008
Embedded Derivatives 0 0
U.S. corporate private securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fixed maturities, including securities pledged 5,622 4,983
Embedded Derivatives 0 0
Foreign corporate public securities and foreign governments(1)    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fixed maturities, including securities pledged 2,778 2,472
Embedded Derivatives 0 0
Foreign corporate private securities(1)    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fixed maturities, including securities pledged 2,809 2,537
Embedded Derivatives 0 0
Residential mortgage-backed securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fixed maturities, including securities pledged 4,344 3,471
Embedded Derivatives 1 (4)
Commercial mortgage-backed securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fixed maturities, including securities pledged 2,676 3,132
Embedded Derivatives 0 0
Other asset-backed securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fixed maturities, including securities pledged 2,903 2,769
Embedded Derivatives 0 0
Assets measured on recurring basis    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash and cash equivalents, short-term investments and short-term investments under securities loan agreements 2,357 2,535
Assets held in separate accounts 113,007 101,676
Total assets 145,968 132,269
Contingent consideration liability 147 2
Total liabilities 425 394
Assets measured on recurring basis | Stabilizer and MCGs    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment contract liabilities: 5 19
Assets measured on recurring basis | Interest rate contracts    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivatives 184 246
Derivatives 258 313
Assets measured on recurring basis | Foreign exchange contracts    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivatives 10 55
Derivatives 22 8
Assets measured on recurring basis | Equity contracts    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivatives 3 2
Derivatives 2 9
Assets measured on recurring basis | Credit Risk Contract    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivatives   2
Assets measured on recurring basis | Embedded derivatives within reinsurance    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Embedded Derivatives 55 55
Embedded derivative on reinsurance liability 9 (41)
Assets measured on recurring basis | Fixed maturities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fixed maturities, including securities pledged 30,151 27,454
Assets measured on recurring basis | U.S. Treasuries    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fixed maturities, including securities pledged 614 472
Assets measured on recurring basis | U.S. Government agencies and authorities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fixed maturities, including securities pledged 31 30
Assets measured on recurring basis | State, municipalities and political subdivisions    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fixed maturities, including securities pledged 510 580
Assets measured on recurring basis | U.S. corporate public securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fixed maturities, including securities pledged 7,864 7,008
Assets measured on recurring basis | U.S. corporate private securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fixed maturities, including securities pledged 5,622 4,983
Assets measured on recurring basis | Foreign corporate public securities and foreign governments(1)    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fixed maturities, including securities pledged 2,778 2,472
Assets measured on recurring basis | Foreign corporate private securities(1)    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fixed maturities, including securities pledged 2,809 2,537
Assets measured on recurring basis | Residential mortgage-backed securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fixed maturities, including securities pledged 4,344 3,471
Assets measured on recurring basis | Commercial mortgage-backed securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fixed maturities, including securities pledged 2,676 3,132
Assets measured on recurring basis | Other asset-backed securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fixed maturities, including securities pledged 2,903 2,769
Assets measured on recurring basis | Equity securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Equity securities 201 246
Assets measured on recurring basis | Level 1    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash and cash equivalents, short-term investments and short-term investments under securities loan agreements 2,352 2,511
Assets held in separate accounts 107,191 95,946
Total assets 110,138 99,007
Contingent consideration liability 0 0
Total liabilities 0 11
Assets measured on recurring basis | Level 1 | Stabilizer and MCGs    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment contract liabilities: 0 0
Assets measured on recurring basis | Level 1 | Interest rate contracts    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivatives 2 0
Derivatives 0 11
Assets measured on recurring basis | Level 1 | Foreign exchange contracts    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivatives 0 0
Derivatives 0 0
Assets measured on recurring basis | Level 1 | Equity contracts    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivatives 0 0
Derivatives 0 0
Assets measured on recurring basis | Level 1 | Credit Risk Contract    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivatives   0
Assets measured on recurring basis | Level 1 | Embedded derivatives within reinsurance    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Embedded Derivatives 0 0
Embedded derivative on reinsurance liability 0 0
Assets measured on recurring basis | Level 1 | Fixed maturities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fixed maturities, including securities pledged 486 402
Assets measured on recurring basis | Level 1 | U.S. Treasuries    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fixed maturities, including securities pledged 486 402
Assets measured on recurring basis | Level 1 | U.S. Government agencies and authorities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fixed maturities, including securities pledged 0 0
Assets measured on recurring basis | Level 1 | State, municipalities and political subdivisions    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fixed maturities, including securities pledged 0 0
Assets measured on recurring basis | Level 1 | U.S. corporate public securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fixed maturities, including securities pledged 0 0
Assets measured on recurring basis | Level 1 | U.S. corporate private securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fixed maturities, including securities pledged 0 0
Assets measured on recurring basis | Level 1 | Foreign corporate public securities and foreign governments(1)    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fixed maturities, including securities pledged 0 0
Assets measured on recurring basis | Level 1 | Foreign corporate private securities(1)    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fixed maturities, including securities pledged 0 0
Assets measured on recurring basis | Level 1 | Residential mortgage-backed securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fixed maturities, including securities pledged 0 0
Assets measured on recurring basis | Level 1 | Commercial mortgage-backed securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fixed maturities, including securities pledged 0 0
Assets measured on recurring basis | Level 1 | Other asset-backed securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fixed maturities, including securities pledged 0 0
Assets measured on recurring basis | Level 1 | Equity securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Equity securities 107 148
Assets measured on recurring basis | Level 2    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash and cash equivalents, short-term investments and short-term investments under securities loan agreements 5 1
Assets held in separate accounts 5,428 5,390
Total assets 32,109 30,674
Contingent consideration liability 0 0
Total liabilities 273 309
Assets measured on recurring basis | Level 2 | Stabilizer and MCGs    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment contract liabilities: 0 0
Assets measured on recurring basis | Level 2 | Interest rate contracts    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivatives 182 246
Derivatives 258 302
Assets measured on recurring basis | Level 2 | Foreign exchange contracts    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivatives 10 55
Derivatives 22 8
Assets measured on recurring basis | Level 2 | Equity contracts    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivatives 3 2
Derivatives 2 9
Assets measured on recurring basis | Level 2 | Credit Risk Contract    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivatives   2
Assets measured on recurring basis | Level 2 | Embedded derivatives within reinsurance    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Embedded Derivatives 55 55
Embedded derivative on reinsurance liability (9) (12)
Assets measured on recurring basis | Level 2 | Fixed maturities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fixed maturities, including securities pledged 26,426 24,925
Assets measured on recurring basis | Level 2 | U.S. Treasuries    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fixed maturities, including securities pledged 128 70
Assets measured on recurring basis | Level 2 | U.S. Government agencies and authorities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fixed maturities, including securities pledged 31 30
Assets measured on recurring basis | Level 2 | State, municipalities and political subdivisions    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fixed maturities, including securities pledged 510 580
Assets measured on recurring basis | Level 2 | U.S. corporate public securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fixed maturities, including securities pledged 7,786 6,949
Assets measured on recurring basis | Level 2 | U.S. corporate private securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fixed maturities, including securities pledged 3,522 3,486
Assets measured on recurring basis | Level 2 | Foreign corporate public securities and foreign governments(1)    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fixed maturities, including securities pledged 2,718 2,412
Assets measured on recurring basis | Level 2 | Foreign corporate private securities(1)    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fixed maturities, including securities pledged 2,178 2,116
Assets measured on recurring basis | Level 2 | Residential mortgage-backed securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fixed maturities, including securities pledged 4,273 3,404
Assets measured on recurring basis | Level 2 | Commercial mortgage-backed securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fixed maturities, including securities pledged 2,676 3,132
Assets measured on recurring basis | Level 2 | Other asset-backed securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fixed maturities, including securities pledged 2,604 2,746
Assets measured on recurring basis | Level 2 | Equity securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Equity securities 0 0
Assets measured on recurring basis | Level 3    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash and cash equivalents, short-term investments and short-term investments under securities loan agreements 0 23
Assets held in separate accounts 388 340
Total assets 3,721 2,588
Contingent consideration liability 147 2
Total liabilities 152 74
Assets measured on recurring basis | Level 3 | Stabilizer and MCGs    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment contract liabilities: 5 19
Assets measured on recurring basis | Level 3 | Interest rate contracts    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivatives 0 0
Derivatives 0 0
Assets measured on recurring basis | Level 3 | Foreign exchange contracts    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivatives 0 0
Derivatives 0 0
Assets measured on recurring basis | Level 3 | Equity contracts    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivatives 0 0
Derivatives 0 0
Assets measured on recurring basis | Level 3 | Credit Risk Contract    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivatives   0
Assets measured on recurring basis | Level 3 | Embedded derivatives within reinsurance    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Embedded Derivatives 0 0
Embedded derivative on reinsurance liability 0 (53)
Assets measured on recurring basis | Level 3 | Fixed maturities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fixed maturities, including securities pledged 3,239 2,127
Assets measured on recurring basis | Level 3 | U.S. Treasuries    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fixed maturities, including securities pledged 0 0
Assets measured on recurring basis | Level 3 | U.S. Government agencies and authorities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fixed maturities, including securities pledged 0 0
Assets measured on recurring basis | Level 3 | State, municipalities and political subdivisions    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fixed maturities, including securities pledged 0 0
Assets measured on recurring basis | Level 3 | U.S. corporate public securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fixed maturities, including securities pledged 78 59
Assets measured on recurring basis | Level 3 | U.S. corporate private securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fixed maturities, including securities pledged 2,100 1,497
Assets measured on recurring basis | Level 3 | Foreign corporate public securities and foreign governments(1)    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fixed maturities, including securities pledged 60 60
Assets measured on recurring basis | Level 3 | Foreign corporate private securities(1)    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fixed maturities, including securities pledged 631 421
Assets measured on recurring basis | Level 3 | Residential mortgage-backed securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fixed maturities, including securities pledged 71 67
Assets measured on recurring basis | Level 3 | Commercial mortgage-backed securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fixed maturities, including securities pledged 0 0
Assets measured on recurring basis | Level 3 | Other asset-backed securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fixed maturities, including securities pledged 299 23
Assets measured on recurring basis | Level 3 | Equity securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Equity securities $ 94 $ 98