Operating Costs and Other Expenses (Details) - USD ($) $ in Millions |
3 Months Ended | 9 Months Ended | ||
|---|---|---|---|---|
Sep. 30, 2026 |
Sep. 30, 2025 |
Sep. 30, 2026 |
Sep. 30, 2025 |
|
| Operating Costs And Other Expenses [Abstract] | ||||
| Asset-based commission expenses | $ 305 | $ 296 | $ 898 | $ 853 |
| Other commission expenses | 394 | 323 | 1,069 | 781 |
| Sub-advisor expenses | 73 | 78 | 220 | 232 |
| General and administrative expenses | 270 | 264 | 834 | 797 |
| Deferral of acquisition costs | (330) | (247) | (887) | (591) |
| Total operating costs and other expenses | $ 712 | $ 714 | $ 2,134 | $ 2,072 |