Employee Benefit Plans (Contributions) (Details) - USD ($) $ in Millions |
3 Months Ended | 6 Months Ended | ||
|---|---|---|---|---|
Jun. 30, 2026 |
Jun. 30, 2025 |
Jun. 30, 2026 |
Jun. 30, 2025 |
|
| Retirement Benefits [Abstract] | ||||
| Defined contribution plans | $ 357 | $ 340 | $ 820 | $ 741 |