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Segment Information - Reconciliation of Net Investment Income from Segments to Consolidated (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2025 | Jun. 30, 2024 | Jun. 30, 2025 | Jun. 30, 2024
Segment Reporting Information [Line Items] |  |  |  |
Net investment income | $ 1,466 | $ 1,332 | $ 2,924 | $ 2,679
Operating Segments | Annuities |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net investment income | 464 | 405 | 916 | 785
Operating Segments | Life Insurance |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net investment income | 631 | 565 | 1,255 | 1,187
Operating Segments | Group Protection |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net investment income | 94 | 88 | 183 | 173
Operating Segments | Retirement Plan Services |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net investment income | 252 | 247 | 503 | 491
Other Operations |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net investment income | $ 25 | $ 27 | $ 67 | $ 43

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