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Impairment of Long-Lived Assets (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2020 | Jun. 30, 2020 | Sep. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2018
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |
Impairment of assets held for sale |  |  | $ 12 |  | $ 6 |  | $ 21 | $ 18 |
Asset impairment charge |  |  |  | $ 66 |  |  |  |  | $ 787
Fixed asset impairment charges |  |  |  | 62 |  |  |  | 66 | $ 768
Impairment of definite-lived intangible assets |  |  |  |  |  | $ 787 |  |  |
Americas |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |
Impairment of assets held for sale |  |  |  |  |  |  | 12 |  |
China |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |
Impairment of assets held for sale |  |  |  |  |  |  | 9 |  |
China | Miscellaneous |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |
Asset impairment charge |  |  |  |  |  |  | $ 24 |  |
Significant Unobservable Inputs (Level 3) | Measurement input, cap rate | Valuation, income approach |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |
Reporting unit, measurement input |  |  |  |  |  | 12.50% |  |  | 13.00%
Customer relationships |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |
Impairment of definite-lived intangible assets |  |  |  | $ 4 |  | $ 19 |  |  | $ 19
Asia Segment |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |
Impairment of assets held for sale |  |  |  |  |  |  |  | $ 12 |
Asset impairment charge |  | $ 27 |  |  |  |  |  |  |
Asia Segment | Miscellaneous |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |
Asset impairment charge |  | 24 |  |  |  |  |  |  |
Asia Segment | China |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |
Asset impairment charge | $ 5 |  |  |  |  |  |  |  |
Asia Segment | China | Noncurrent assets |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |
Asset impairment charge |  | $ 3 |  |  |  |  |  |  |

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