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Restructuring and Impairment Costs - Changes in Reserve (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2021 | Sep. 30, 2021 | Sep. 30, 2020
Restructuring Reserve [Roll Forward] |  |  |
Restructuring reserve beginning balance | $ 115 |  |
Noncash adjustment—underspend/other |  |  | $ 20
Restructuring reserve ending balance | 86 | $ 115 |
2022 Restructuring Plan |  |  |
Restructuring Reserve [Roll Forward] |  |  |
Restructuring reserve beginning balance | 3 |  |
Utilized—cash | (1) |  |
Noncash adjustment—underspend/other | 6 |  |
Restructuring reserve ending balance | 2 | 3 |
2021 Restructuring Plan |  |  |
Restructuring Reserve [Roll Forward] |  |  |
Restructuring reserve beginning balance | 22 |  |
Utilized—cash | (10) |  |
Noncash adjustment—underspend/other | (1) | 16 |
Restructuring reserve ending balance | 11 | 22 |
2020 Restructuring Plan |  |  |
Restructuring Reserve [Roll Forward] |  |  |
Restructuring reserve beginning balance | 77 |  |
Utilized—cash | (10) |  |
Noncash adjustment—underspend/other | (6) |  |
Restructuring reserve ending balance | 61 | 77 |
2019 Restructuring Plan |  |  |
Restructuring Reserve [Roll Forward] |  |  |
Restructuring reserve beginning balance | 9 |  |
Utilized—cash | (2) |  |
Noncash adjustment—underspend/other | (1) |  |
Restructuring reserve ending balance | 6 | 9 |
Employee Severance and Termination Benefits | 2022 Restructuring Plan |  |  |
Restructuring Reserve [Roll Forward] |  |  |
Restructuring reserve beginning balance | 3 |  |
Utilized—cash | (1) |  |
Restructuring reserve ending balance | 2 | 3 |
Employee Severance and Termination Benefits | 2021 Restructuring Plan |  |  |
Restructuring Reserve [Roll Forward] |  |  |
Restructuring reserve beginning balance | 22 |  |
Utilized—cash | (10) |  |
Noncash adjustment—underspend/other | (1) |  |
Restructuring reserve ending balance | 11 | 22 |
Employee Severance and Termination Benefits | 2020 Restructuring Plan |  |  |
Restructuring Reserve [Roll Forward] |  |  |
Restructuring reserve beginning balance | 75 |  |
Utilized—cash | (10) |  |
Noncash adjustment—underspend/other | (5) |  |
Restructuring reserve ending balance | 60 | 75 |
Employee Severance and Termination Benefits | 2019 Restructuring Plan |  |  |
Restructuring Reserve [Roll Forward] |  |  |
Restructuring reserve beginning balance | 8 |  |
Utilized—cash | (2) |  |
Noncash adjustment—underspend/other | (1) |  |
Restructuring reserve ending balance | 5 | 8 |
Currency Translation | 2020 Restructuring Plan |  |  |
Restructuring Reserve [Roll Forward] |  |  |
Restructuring reserve beginning balance | 2 |  |
Utilized—cash | 0 |  |
Noncash adjustment—underspend/other | (1) |  |
Restructuring reserve ending balance | 1 | 2 |
Currency Translation | 2019 Restructuring Plan |  |  |
Restructuring Reserve [Roll Forward] |  |  |
Restructuring reserve beginning balance | 1 |  |
Utilized—cash | 0 |  |
Noncash adjustment—underspend/other | 0 |  |
Restructuring reserve ending balance | $ 1 | $ 1 |

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- Definition Amount of cash payments made as the result of exit or disposal activities. Excludes payments associated with a discontinued operation or an asset retirement obligation. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b)(2) -URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 17 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3367-108585 + Details
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- Definition Carrying amount (including both current and noncurrent portions of the accrual) as of the balance sheet date pertaining to a specified type of cost associated with exit from or disposal of business activities or restructuring pursuant to a duly authorized plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b)(2) -URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB TOPIC 5.P.4(b)(2)) -URI http://asc.fasb.org/extlink&oid=115931487&loc=d3e140904-122747 + Details
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- Definition Amount of expense (reversal of expense) which increases (decreases) the restructuring reserve from an adjustment to a previously accrued restructuring liability. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB Topic 5.P.4(b)(2)) -URI http://asc.fasb.org/extlink&oid=115931487&loc=d3e140904-122747 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b)(2) -URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869 + Details
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