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Fair Value Measurements (excluding Consolidated Investment Entities) - Fair Value Measurement (Details) - USD ($)
$ in Millions
Sep. 30, 2025
Dec. 31, 2024
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets held in separate accounts $ 111,950 $ 101,676
Total assets 177,448 163,889
Derivatives 288 332
Total liabilities 170,365 157,882
Fixed maturities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fixed maturities, including securities pledged 29,883 27,454
U.S. Treasuries    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fixed maturities, including securities pledged 549 472
US Government Agencies Debt Securities    
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 518 580
U.S. corporate public securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fixed maturities, including securities pledged 7,769 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 5,507 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 2,762 2,472
Foreign corporate private securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fixed maturities, including securities pledged 2,844 2,537
Residential mortgage-backed securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fixed maturities, including securities pledged 4,201 3,471
Commercial mortgage-backed securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fixed maturities, including securities pledged 2,823 3,132
Other asset-backed securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fixed maturities, including securities pledged 2,879 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 2,343 2,535
Assets held in separate accounts 111,950 101,676
Total assets 144,621 132,269
Contingent consideration 154 2
Total liabilities 481 394
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 6 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 169 246
Derivatives 265 313
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 13 55
Derivatives 21 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 3 2
Derivatives 2 9
Measured at fair value on a recurring basis | Credit contracts    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivatives 0 2
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 33 41
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 29,883 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 549 472
Measured at fair value on a recurring basis | US Government Agencies Debt Securities    
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 518 580
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 7,769 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 5,507 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 2,762 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 2,844 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 4,201 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 2,823 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 2,879 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 198 246
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 2,307 2,511
Assets held in separate accounts 106,219 95,946
Total assets 109,084 99,007
Contingent consideration 0 0
Total liabilities 3 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 1 0
Derivatives 3 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 | 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 | 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 | Fixed maturities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fixed maturities, including securities pledged 453 402
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 453 402
Measured at fair value on a recurring basis | Level 1 | US Government Agencies Debt 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 | 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 104 148
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 26 1
Assets held in separate accounts 5,359 5,390
Total assets 32,257 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 168 246
Derivatives 262 302
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 13 55
Derivatives 21 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 3 2
Derivatives 2 9
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 0 2
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 (9) (12)
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 26,626 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 96 70
Measured at fair value on a recurring basis | Level 2 | US Government Agencies Debt Securities    
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 518 580
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 7,706 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 3,706 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 2,701 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 2,243 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 4,132 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 2,823 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 2,670 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 10 23
Assets held in separate accounts 372 340
Total assets 3,280 2,588
Contingent consideration 154 2
Total liabilities 202 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 6 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 | 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 | Embedded derivatives within reinsurance    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivatives 0 0
Embedded derivatives within reinsurance 42 53
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 2,804 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 | US Government Agencies Debt 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 | 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 63 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 1,801 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 61 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 601 421
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 69 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 209 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 $ 94 $ 98