Operating Costs and Other Expenses (Details) - USD ($) $ in Millions |
3 Months Ended | 6 Months Ended | ||
|---|---|---|---|---|
Jun. 30, 2026 |
Jun. 30, 2025 |
Jun. 30, 2026 |
Jun. 30, 2025 |
|
| Operating Costs And Other Expenses [Abstract] | ||||
| Asset-based commission expenses | $ 298 | $ 273 | $ 593 | $ 557 |
| Other commission expenses | 353 | 243 | 675 | 458 |
| Sub-advisor expenses | 73 | 76 | 147 | 154 |
| General and administrative expenses | 265 | 274 | 564 | 533 |
| Deferral of acquisition costs | (302) | (185) | (557) | (344) |
| Total operating costs and other expenses | $ 687 | $ 681 | $ 1,422 | $ 1,358 |