Employee Benefit Plans (Contributions) (Details) - USD ($) $ in Millions |
3 Months Ended | 9 Months Ended | ||
|---|---|---|---|---|
Sep. 30, 2026 |
Sep. 30, 2025 |
Sep. 30, 2026 |
Sep. 30, 2025 |
|
| Retirement Benefits [Abstract] | ||||
| Defined contribution plans | $ 334 | $ 316 | $ 1,154 | $ 1,057 |