Non-AHP Roll Forward (Details) - USD ($) $ in Millions |
3 Months Ended | 6 Months Ended | ||
|---|---|---|---|---|
Jun. 30, 2026 |
Jun. 30, 2025 |
Jun. 30, 2026 |
Jun. 30, 2025 |
|
| Voluntary non-AHP contributions [Abstract] | ||||
| Voluntary non-AHP contributions liability, at beginning of period | $ 12 | $ 6 | ||
| Voluntary non-AHP expense | $ 17 | $ 13 | 27 | 20 |
| Voluntary grants and donations | (32) | (25) | ||
| Voluntary non-AHP contributions liability, at end of period | $ 7 | $ 1 | $ 7 | $ 1 |