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Fair Value Measurements (excluding Consolidated Investment Entities) - Fair Value Measurement (Details) - USD ($) $ in Millions | Dec. 31, 2025 | Dec. 31, 2024
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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

X
- Definition Amount of liability recognized from contingent consideration in asset acquisition. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 805 -SubTopic 50 -Name Accounting Standards Codification -Section 15 -Paragraph 3 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480123/805-50-15-3 + Details
Name: | us-gaap_AssetAcquisitionContingentConsiderationLiability
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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