INVESTMENTS - Investment Gains (Losses), Net (Details) - USD ($) $ in Millions |
3 Months Ended | 9 Months Ended | ||
|---|---|---|---|---|
Sep. 30, 2026 |
Sep. 30, 2025 |
Sep. 30, 2026 |
Sep. 30, 2025 |
|
| Net Investment Income [Line Items] | ||||
| Investment gains (losses), net | $ (84) | $ (1,170) | $ (178) | $ (1,255) |
| Investment gains (losses), net | 1,100 | 1,100 | ||
| RGA Reinsurance Company | ||||
| Net Investment Income [Line Items] | ||||
| Investment gains (losses), net | 1,100 | 1,100 | ||
| Fixed maturities | ||||
| Net Investment Income [Line Items] | ||||
| Investment gains (losses), net | (27) | (1,161) | (70) | (1,180) |
| Mortgage loans on real estate | ||||
| Net Investment Income [Line Items] | ||||
| Investment gains (losses), net | (55) | (9) | (105) | (77) |
| Other | ||||
| Net Investment Income [Line Items] | ||||
| Investment gains (losses), net | $ (2) | $ 0 | $ (3) | $ 2 |