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v3.20.2

Restructuring and Impairment Costs - Changes in Reserve (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2018
Restructuring Reserve [Roll Forward] |  |  |
Restructuring reserve beginning balance | $ 123 |  |
Restructuring reserve ending balance | 237 | $ 123 |
2020 restructuring plan |  |  |
Restructuring Reserve [Roll Forward] |  |  |
Restructuring reserve beginning balance | 205 |  |
Utilized—cash | (35) |  |
Noncash adjustment—other | (1) |  |
Noncash adjustment—underspend | (20) |  |
Restructuring reserve ending balance | 169 | 205 |
2019 restructuring plan |  |  |
Restructuring Reserve [Roll Forward] |  |  |
Restructuring reserve beginning balance | 70 | 105 |
Utilized—cash | (30) | (32) |
Noncash adjustment—other | 2 | (3) |
Noncash adjustment—underspend | (7) | (16) |
Restructuring reserve ending balance | 35 | 70 | $ 105
2018 restructuring plan |  |  |
Restructuring Reserve [Roll Forward] |  |  |
Restructuring reserve beginning balance | 20 | 48 | 71
Utilized—cash | (9) | (24) | (19)
Noncash adjustment—other | 1 | (3) | (4)
Reserve adjustment |  | 9 |
Noncash adjustment—underspend | (7) | (10) |
Restructuring reserve ending balance | 5 | 20 | 48
2017 restructuring plan |  |  |
Restructuring Reserve [Roll Forward] |  |  |
Restructuring reserve ending balance | 3 |  |
2016 restructuring plan |  |  |
Restructuring Reserve [Roll Forward] |  |  |
Noncash adjustment—underspend |  |  | (20)
Restructuring reserve ending balance | 25 |  |
Employee Severance and Termination Benefits | 2020 restructuring plan |  |  |
Restructuring Reserve [Roll Forward] |  |  |
Restructuring reserve beginning balance | 203 |  |
Utilized—cash | (35) |  |
Noncash adjustment—other | 0 |  |
Restructuring reserve ending balance | 168 | 203 |
Employee Severance and Termination Benefits | 2019 restructuring plan |  |  |
Restructuring Reserve [Roll Forward] |  |  |
Restructuring reserve beginning balance | 69 | 101 |
Utilized—cash | (30) | (32) |
Noncash adjustment—other | 0 | 0 |
Noncash adjustment—underspend | (7) |  |
Restructuring reserve ending balance | 32 | 69 | 101
Employee Severance and Termination Benefits | 2018 restructuring plan |  |  |
Restructuring Reserve [Roll Forward] |  |  |
Restructuring reserve beginning balance | 24 | 49 | 68
Utilized—cash | (9) | (24) | (19)
Noncash adjustment—other | 0 | 0 | 0
Reserve adjustment |  | 9 |
Noncash adjustment—underspend | (7) | (10) |
Restructuring reserve ending balance | 8 | 24 | 49
Other | 2020 restructuring plan |  |  |
Restructuring Reserve [Roll Forward] |  |  |
Restructuring reserve beginning balance | 2 |  |
Utilized—cash | 0 |  |
Noncash adjustment—other | (2) |  |
Restructuring reserve ending balance | 0 | 2 |
Other | 2019 restructuring plan |  |  |
Restructuring Reserve [Roll Forward] |  |  |
Restructuring reserve beginning balance | 3 | 4 |
Utilized—cash | 0 | 0 |
Noncash adjustment—other | 0 | (1) |
Noncash adjustment—underspend | 0 |  |
Restructuring reserve ending balance | 3 | 3 | 4
Other | 2018 restructuring plan |  |  |
Restructuring Reserve [Roll Forward] |  |  |
Restructuring reserve beginning balance | 0 | 1 | 3
Utilized—cash | 0 | 0 | 0
Noncash adjustment—other | 0 | (1) | (2)
Reserve adjustment |  | 0 |
Noncash adjustment—underspend | 0 | 0 |
Restructuring reserve ending balance | 0 | 0 | 1
Currency Translation | 2020 restructuring plan |  |  |
Restructuring Reserve [Roll Forward] |  |  |
Restructuring reserve beginning balance | 0 |  |
Utilized—cash | 0 |  |
Noncash adjustment—other | 1 |  |
Restructuring reserve ending balance | 1 | 0 |
Currency Translation | 2019 restructuring plan |  |  |
Restructuring Reserve [Roll Forward] |  |  |
Restructuring reserve beginning balance | (2) | 0 |
Utilized—cash | 0 | 0 |
Noncash adjustment—other | 2 | (2) |
Noncash adjustment—underspend | 0 |  |
Restructuring reserve ending balance | 0 | (2) | 0
Currency Translation | 2018 restructuring plan |  |  |
Restructuring Reserve [Roll Forward] |  |  |
Restructuring reserve beginning balance | (4) | (2) | 0
Utilized—cash | 0 | 0 | 0
Noncash adjustment—other | 1 | (2) | (2)
Reserve adjustment |  | 0 |
Noncash adjustment—underspend | 0 | 0 |
Restructuring reserve ending balance | $ (3) | $ (4) | $ (2)

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