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Separate Accounts - Separate Account Assets (Details) - USD ($) $ in Millions | Sep. 30, 2025 | Dec. 31, 2024
--- | --- | ---
Fair Value, Separate Account Investment [Line Items] |  |
Assets held in separate accounts | $ 111,950 | $ 101,676
U.S. Government agencies and authorities |  |
Fair Value, Separate Account Investment [Line Items] |  |
Assets held in separate accounts | 991 | 913
Corporate and foreign debt securities |  |
Fair Value, Separate Account Investment [Line Items] |  |
Assets held in separate accounts | 2,572 | 2,493
Mortgage-backed securities |  |
Fair Value, Separate Account Investment [Line Items] |  |
Assets held in separate accounts | 2,903 | 3,087
Equity securities (including mutual funds) |  |
Fair Value, Separate Account Investment [Line Items] |  |
Assets held in separate accounts | 104,625 | 94,685
Cash, cash equivalents and short-term investments |  |
Fair Value, Separate Account Investment [Line Items] |  |
Assets held in separate accounts | 651 | 437
Receivable for securities and accruals |  |
Fair Value, Separate Account Investment [Line Items] |  |
Assets held in separate accounts | $ 208 | $ 61

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