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Fair Value Measurements (excluding Consolidated Investment Entities) - Fair Value Measurement (Details) - USD ($)
$ in Millions
Mar. 31, 2025
Dec. 31, 2024
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets held in separate accounts $ 98,948 $ 101,676
Total assets 163,950 163,889
Derivatives 286 332
Total liabilities 157,589 157,882
Fixed maturities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fixed maturities, including securities pledged 29,225 27,454
U.S. Treasuries    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fixed maturities, including securities pledged 475 472
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
State, municipalities and political subdivisions    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fixed maturities, including securities pledged 533 580
U.S. corporate public securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fixed maturities, including securities pledged 7,462 7,008
U.S. corporate private securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fixed maturities, including securities pledged 5,448 4,983
Foreign corporate public securities and foreign governments    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fixed maturities, including securities pledged 2,621 2,472
Foreign corporate private securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fixed maturities, including securities pledged 2,788 2,537
Residential mortgage-backed securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fixed maturities, including securities pledged 3,750 3,471
Commercial mortgage-backed securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fixed maturities, including securities pledged 3,115 3,132
Other asset-backed securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fixed maturities, including securities pledged 3,002 2,769
Measured at fair value on a 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 2,047 2,535
Assets held in separate accounts 98,948 101,676
Total assets 130,740 132,269
Contingent consideration 152 2
Total liabilities 496 394
Measured at fair value on a recurring basis | Stabilizer and MCGs    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Guaranteed benefit derivatives 16 19
Measured at fair value on a recurring basis | Interest rate contracts    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivatives 208 246
Derivatives 271 313
Measured at fair value on a recurring basis | Foreign exchange contracts    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivatives 40 55
Derivatives 11 8
Measured at fair value on a recurring basis | Equity contracts    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivatives 1 2
Derivatives 3 9
Measured at fair value on a recurring basis | Embedded derivatives within reinsurance    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivatives 62 55
Embedded derivatives within reinsurance 42 41
Measured at fair value on a recurring basis | Credit contracts    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivatives 1 2
Measured at fair value on a recurring basis | Fixed maturities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fixed maturities, including securities pledged 29,225 27,454
Measured at fair value on a recurring basis | U.S. Treasuries    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fixed maturities, including securities pledged 475 472
Measured at fair value on a 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
Measured at fair value on a 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 533 580
Measured at fair value on a 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 7,462 7,008
Measured at fair value on a 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 5,448 4,983
Measured at fair value on a recurring basis | Foreign corporate public securities and foreign governments    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fixed maturities, including securities pledged 2,621 2,472
Measured at fair value on a recurring basis | Foreign corporate private securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fixed maturities, including securities pledged 2,788 2,537
Measured at fair value on a recurring basis | Residential mortgage-backed securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fixed maturities, including securities pledged 3,750 3,471
Measured at fair value on a recurring basis | Commercial mortgage-backed securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fixed maturities, including securities pledged 3,115 3,132
Measured at fair value on a recurring basis | Other asset-backed securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fixed maturities, including securities pledged 3,002 2,769
Measured at fair value on a recurring basis | Equity securities, at fair value    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Equity securities 209 246
Measured at fair value on a 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 1,971 2,511
Assets held in separate accounts 93,414 95,946
Total assets 95,887 99,007
Contingent consideration 0 0
Total liabilities 0 11
Measured at fair value on a recurring basis | Level 1 | Stabilizer and MCGs    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Guaranteed benefit derivatives 0 0
Measured at fair value on a 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
Measured at fair value on a 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
Measured at fair value on a 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
Measured at fair value on a recurring basis | Level 1 | Embedded derivatives within reinsurance    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivatives 0 0
Embedded derivatives within reinsurance 0 0
Measured at fair value on a recurring basis | Level 1 | Credit contracts    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivatives 0 0
Measured at fair value on a recurring basis | Level 1 | Fixed maturities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fixed maturities, including securities pledged 401 402
Measured at fair value on a 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 401 402
Measured at fair value on a 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
Measured at fair value on a 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
Measured at fair value on a 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
Measured at fair value on a 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
Measured at fair value on a recurring basis | Level 1 | Foreign corporate public securities and foreign governments    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fixed maturities, including securities pledged 0 0
Measured at fair value on a recurring basis | Level 1 | Foreign corporate private securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fixed maturities, including securities pledged 0 0
Measured at fair value on a 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
Measured at fair value on a 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
Measured at fair value on a 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
Measured at fair value on a recurring basis | Level 1 | Equity securities, at fair value    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Equity securities 99 148
Measured at fair value on a 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 52 1
Assets held in separate accounts 5,196 5,390
Total assets 31,918 30,674
Contingent consideration 0 0
Total liabilities 276 309
Measured at fair value on a recurring basis | Level 2 | Stabilizer and MCGs    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Guaranteed benefit derivatives 0 0
Measured at fair value on a recurring basis | Level 2 | Interest rate contracts    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivatives 206 246
Derivatives 271 302
Measured at fair value on a recurring basis | Level 2 | Foreign exchange contracts    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivatives 40 55
Derivatives 11 8
Measured at fair value on a recurring basis | Level 2 | Equity contracts    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivatives 1 2
Derivatives 3 9
Measured at fair value on a recurring basis | Level 2 | Embedded derivatives within reinsurance    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivatives 62 55
Embedded derivatives within reinsurance (10) (12)
Measured at fair value on a recurring basis | Level 2 | Credit contracts    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivatives 1 2
Measured at fair value on a recurring basis | Level 2 | Fixed maturities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fixed maturities, including securities pledged 26,361 24,925
Measured at fair value on a 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 74 70
Measured at fair value on a 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
Measured at fair value on a 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 533 580
Measured at fair value on a 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 7,414 6,949
Measured at fair value on a 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 3,771 3,486
Measured at fair value on a recurring basis | Level 2 | Foreign corporate public securities and foreign governments    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fixed maturities, including securities pledged 2,562 2,412
Measured at fair value on a recurring basis | Level 2 | Foreign corporate private securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fixed maturities, including securities pledged 2,198 2,116
Measured at fair value on a 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 3,680 3,404
Measured at fair value on a 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 3,115 3,132
Measured at fair value on a 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 2,983 2,746
Measured at fair value on a recurring basis | Level 2 | Equity securities, at fair value    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Equity securities 0 0
Measured at fair value on a 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 24 23
Assets held in separate accounts 338 340
Total assets 2,935 2,588
Contingent consideration 152 2
Total liabilities 220 74
Measured at fair value on a recurring basis | Level 3 | Stabilizer and MCGs    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Guaranteed benefit derivatives 16 19
Measured at fair value on a 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
Measured at fair value on a 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
Measured at fair value on a 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
Measured at fair value on a recurring basis | Level 3 | Embedded derivatives within reinsurance    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivatives 0 0
Embedded derivatives within reinsurance 52 53
Measured at fair value on a recurring basis | Level 3 | Credit contracts    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivatives 0 0
Measured at fair value on a recurring basis | Level 3 | Fixed maturities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fixed maturities, including securities pledged 2,463 2,127
Measured at fair value on a 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
Measured at fair value on a 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
Measured at fair value on a 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
Measured at fair value on a 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 48 59
Measured at fair value on a 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 1,677 1,497
Measured at fair value on a recurring basis | Level 3 | Foreign corporate public securities and foreign governments    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fixed maturities, including securities pledged 59 60
Measured at fair value on a recurring basis | Level 3 | Foreign corporate private securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fixed maturities, including securities pledged 590 421
Measured at fair value on a 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 70 67
Measured at fair value on a 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
Measured at fair value on a 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 19 23
Measured at fair value on a recurring basis | Level 3 | Equity securities, at fair value    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Equity securities $ 110 $ 98