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Pension and Other Postretirement Benefits - Pension Plan Assets (Detail) - USD ($) $ in Millions | Sep. 30, 2022 | Sep. 30, 2021 | Sep. 30, 2020
--- | --- | --- | ---
U.S. Plans |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Fair value of plan assets | $ 960 | $ 1,288 | $ 1,142
U.S. Plans | Fair Value, Measurements, Recurring |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Fair value of plan assets | 960 | 1,288 |
U.S. Plans | Fair Value, Measurements, Recurring | Cash and cash equivalents |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Fair value of plan assets | 40 | 20 |
U.S. Plans | Fair Value, Measurements, Recurring | Collective investment funds |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Fair value of plan assets | 319 | 548 |
U.S. Plans | Fair Value, Measurements, Recurring | Corporate debt securities |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Fair value of plan assets | 392 | 455 |
U.S. Plans | Fair Value, Measurements, Recurring | U.S. government-sponsored debt securities |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Fair value of plan assets | 22 | 28 |
U.S. Plans | Fair Value, Measurements, Recurring | U.S. Treasury securities |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Fair value of plan assets | 101 | 105 |
U.S. Plans | Fair Value, Measurements, Recurring | Asset-backed securities |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Fair value of plan assets | 29 | 31 |
U.S. Plans | Fair Value, Measurements, Recurring | Equity securities |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Fair value of plan assets | 57 | 101 |
U.S. Plans | Fair Value, Measurements, Recurring | Level 1 |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Fair value of plan assets | 198 | 226 |
U.S. Plans | Fair Value, Measurements, Recurring | Level 1 | Cash and cash equivalents |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Fair value of plan assets | 40 | 20 |
U.S. Plans | Fair Value, Measurements, Recurring | Level 1 | Collective investment funds |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
U.S. Plans | Fair Value, Measurements, Recurring | Level 1 | Corporate debt securities |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
U.S. Plans | Fair Value, Measurements, Recurring | Level 1 | U.S. government-sponsored debt securities |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
U.S. Plans | Fair Value, Measurements, Recurring | Level 1 | U.S. Treasury securities |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Fair value of plan assets | 101 | 105 |
U.S. Plans | Fair Value, Measurements, Recurring | Level 1 | Asset-backed securities |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
U.S. Plans | Fair Value, Measurements, Recurring | Level 1 | Equity securities |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Fair value of plan assets | 57 | 101 |
U.S. Plans | Fair Value, Measurements, Recurring | Level 2 |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Fair value of plan assets | 733 | 1,031 |
U.S. Plans | Fair Value, Measurements, Recurring | Level 2 | Cash and cash equivalents |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
U.S. Plans | Fair Value, Measurements, Recurring | Level 2 | Collective investment funds |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Fair value of plan assets | 319 | 548 |
U.S. Plans | Fair Value, Measurements, Recurring | Level 2 | Corporate debt securities |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Fair value of plan assets | 392 | 455 |
U.S. Plans | Fair Value, Measurements, Recurring | Level 2 | U.S. government-sponsored debt securities |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Fair value of plan assets | 22 | 28 |
U.S. Plans | Fair Value, Measurements, Recurring | Level 2 | U.S. Treasury securities |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
U.S. Plans | Fair Value, Measurements, Recurring | Level 2 | Asset-backed securities |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
U.S. Plans | Fair Value, Measurements, Recurring | Level 2 | Equity securities |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
U.S. Plans | Fair Value, Measurements, Recurring | Level 3 |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Fair value of plan assets | 29 | 31 |
U.S. Plans | Fair Value, Measurements, Recurring | Level 3 | Cash and cash equivalents |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
U.S. Plans | Fair Value, Measurements, Recurring | Level 3 | Collective investment funds |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
U.S. Plans | Fair Value, Measurements, Recurring | Level 3 | Corporate debt securities |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
U.S. Plans | Fair Value, Measurements, Recurring | Level 3 | U.S. government-sponsored debt securities |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
U.S. Plans | Fair Value, Measurements, Recurring | Level 3 | U.S. Treasury securities |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
U.S. Plans | Fair Value, Measurements, Recurring | Level 3 | Asset-backed securities |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Fair value of plan assets | 29 | 31 |
U.S. Plans | Fair Value, Measurements, Recurring | Level 3 | Equity securities |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
Non-U.S. Plans |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Fair value of plan assets | 327 | 548 | $ 525
Non-U.S. Plans | Fair Value, Measurements, Recurring |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Fair value of plan assets | 327 | 548 |
Non-U.S. Plans | Fair Value, Measurements, Recurring | Cash and cash equivalents |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Fair value of plan assets | 3 | 18 |
Non-U.S. Plans | Fair Value, Measurements, Recurring | Corporate debt securities |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Fair value of plan assets | 91 | 51 |
Non-U.S. Plans | Fair Value, Measurements, Recurring | Asset-backed securities |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Fair value of plan assets | 45 | 78 |
Non-U.S. Plans | Fair Value, Measurements, Recurring | Equity funds |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Fair value of plan assets | 13 | 68 |
Non-U.S. Plans | Fair Value, Measurements, Recurring | Multi-asset securities |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Fair value of plan assets | 175 | 333 |
Non-U.S. Plans | Fair Value, Measurements, Recurring | Level 1 |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Fair value of plan assets | 3 | 18 |
Non-U.S. Plans | Fair Value, Measurements, Recurring | Level 1 | Cash and cash equivalents |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Fair value of plan assets | 3 | 18 |
Non-U.S. Plans | Fair Value, Measurements, Recurring | Level 1 | Corporate debt securities |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
Non-U.S. Plans | Fair Value, Measurements, Recurring | Level 1 | Asset-backed securities |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
Non-U.S. Plans | Fair Value, Measurements, Recurring | Level 1 | Equity funds |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
Non-U.S. Plans | Fair Value, Measurements, Recurring | Level 1 | Multi-asset securities |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
Non-U.S. Plans | Fair Value, Measurements, Recurring | Level 2 |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Fair value of plan assets | 279 | 452 |
Non-U.S. Plans | Fair Value, Measurements, Recurring | Level 2 | Cash and cash equivalents |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
Non-U.S. Plans | Fair Value, Measurements, Recurring | Level 2 | Corporate debt securities |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Fair value of plan assets | 91 | 51 |
Non-U.S. Plans | Fair Value, Measurements, Recurring | Level 2 | Asset-backed securities |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
Non-U.S. Plans | Fair Value, Measurements, Recurring | Level 2 | Equity funds |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Fair value of plan assets | 13 | 68 |
Non-U.S. Plans | Fair Value, Measurements, Recurring | Level 2 | Multi-asset securities |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Fair value of plan assets | 175 | 333 |
Non-U.S. Plans | Fair Value, Measurements, Recurring | Level 3 |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Fair value of plan assets | 45 | 78 |
Non-U.S. Plans | Fair Value, Measurements, Recurring | Level 3 | Cash and cash equivalents |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
Non-U.S. Plans | Fair Value, Measurements, Recurring | Level 3 | Corporate debt securities |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
Non-U.S. Plans | Fair Value, Measurements, Recurring | Level 3 | Asset-backed securities |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Fair value of plan assets | 45 | 78 |
Non-U.S. Plans | Fair Value, Measurements, Recurring | Level 3 | Equity funds |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
Non-U.S. Plans | Fair Value, Measurements, Recurring | Level 3 | Multi-asset securities |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Fair value of plan assets | $ 0 | $ 0 |

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