INVESTMENTS - Net Effect on Shareholders' Equity of Unrealized Gains and Losses from Investment Securities (Detail) - USD ($) $ in Millions |
6 Months Ended | 12 Months Ended |
|---|---|---|
Jun. 30, 2025 |
Dec. 31, 2024 |
|
| Investments [Abstract] | ||
| Unrealized gains (losses) on securities available-for-sale | $ (1,151) | $ 1,180 |
| Deferred income taxes | (677) | (1,156) |
| Unrealized gains (losses) on fixed maturity securities | $ (1,828) | $ 24 |