Pension and Other Postretirement Benefits - Benefit Obligations in Excess of Plan Assets (Detail) - USD ($) $ in Millions |
Sep. 30, 2021 |
Sep. 30, 2020 |
|---|---|---|
| U.S. Plans | ||
| Accumulated benefit obligation in excess of plan assets | ||
| Accumulated benefit obligation at end of period | $ (6) | $ (7) |
| Fair value of plan assets at end of period | 0 | 0 |
| Projected benefit obligation in excess of plan assets | ||
| Benefit obligation at end of period | (6) | (7) |
| Fair value of plan assets at end of period | 0 | 0 |
| Non-U.S. Plans | ||
| Accumulated benefit obligation in excess of plan assets | ||
| Accumulated benefit obligation at end of period | (520) | (563) |
| Fair value of plan assets at end of period | 548 | 525 |
| Projected benefit obligation in excess of plan assets | ||
| Benefit obligation at end of period | (520) | (563) |
| Fair value of plan assets at end of period | $ 548 | $ 525 |