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Income Taxes - Narrative (Details) - USD ($) $ in Millions | 1 Months Ended | 12 Months Ended | 15 Months Ended
--- | --- | --- | ---
Dec. 31, 2021 | Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2021 | Dec. 31, 2020
Income Tax Contingency [Line Items] |  |  |  |  |
Payroll taxes deferred |  |  |  |  | $ 73
Payroll taxes paid | $ 37 |  |  |  |
Tax holiday expiration, percent |  | 80.00% |  |  |
Tax holiday expiration, term of expiration |  | 4 years |  |  |
Unrecognized tax benefits that would impact effective tax rate |  | $ 196 |  |  |
Unrecognized tax benefits, income tax penalties and interest expense (income) |  | 1 | $ (7) | $ (6) |
Unrecognized tax benefits, income tax penalties and interest accrued |  | 22 | 21 |  |
Income taxes paid |  | 3,310 | $ 720 | $ 680 |
Net operating losses and tax credits, amount available to carry forward |  | $ 253 |  |  |
Net operating losses and tax credits, additional amount available to carry forward, term |  | 10 years |  |  |
Percentage of net operating losses and tax credits that can be carried forward |  | 66.67% |  |  |
Copeland |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |
Income taxes paid |  | $ 2,300 |  |  |

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- Definition The amount of cash paid during the current period to foreign, federal, state, and local authorities as taxes on income. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482913/230-10-50-2 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 25 -Subparagraph (f) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482740/230-10-45-25 + Details
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