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Income Taxes Other Tax Matters (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended | 24 Months Ended
--- | --- | --- | ---
Sep. 30, 2021 | Dec. 31, 2019 | Jun. 30, 2019 | Dec. 31, 2018 | Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020
Other Tax Matters [Line Items] |  |  |  |  |  |  |  |
Intercompany intellectual property transfer | $ 417 |  |  |  | $ 417 | $ 0 | $ 0 |
Restructuring and impairment costs |  |  |  |  | 242 | 783 | 235 |
Restructuring charges, tax |  |  |  |  | 39 | (48) |  |
Mark-to-market gain (loss) |  |  |  |  | 402 | (274) | (618) |
Mark-to-market gain(loss), tax |  |  |  |  | 93 | (65) | (130) |
Effective Income Tax Rate Reconciliation, Other Adjustments, Amount |  | $ 30 |  | $ (76) |  |  |  |
Transaction and integration costs |  |  |  |  |  | 135 | 317 |
Release of tax indemnification reserve |  |  | $ (226) |  |  |  | (226) |
Transaction and Integration Costs, Tax |  |  |  |  |  | 18 | 35 |
Global Products |  |  |  |  |  |  |  |
Other Tax Matters [Line Items] |  |  |  |  |  |  |  |
Restructuring charges, tax |  |  |  |  |  |  | 53 |
Impairment of Long-Lived Assets to be Disposed of |  |  |  |  |  | $ 15 | $ 235 | $ 250
2021 Restructuring Plan |  |  |  |  |  |  |  |
Other Tax Matters [Line Items] |  |  |  |  |  |  |  |
Restructuring and impairment costs |  |  |  |  | 242 |  |  |
2021 Restructuring Plan | Global Products |  |  |  |  |  |  |  |
Other Tax Matters [Line Items] |  |  |  |  |  |  |  |
Restructuring and impairment costs |  |  |  |  | $ 91 |  |  |

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