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Debt and Other Financing Activities - Summary of Current and Long-term Debt (Parenthetical) (Details) € in Millions, $ in Millions | 6 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Mar. 31, 2022 USD ($) | Sep. 30, 2021 USD ($) | Mar. 31, 2022 EUR (€) | Sep. 30, 2021 EUR (€)
Debt Instrument [Line Items] |  |  |  |
Unamortized debt issuance expense, long-term debt | $ 16 | $ 17 |  |
Short-term Debt | $ 0 | $ 365 |  |
3.375% Senior Notes, due 2031 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt instrument, interest rate, stated percentage | 3.375% |  | 3.375% |
Debt instrument, maturity year | 2031 | 2031 |  |
2.00% Senior Notes Due 2028 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt instrument, interest rate, stated percentage | 2.00% |  | 2.00% |
Debt instrument, maturity year | 2028 | 2028 |  |
Principal amount | € |  |  | € 500 | € 500
6.875% Notes due 2043 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt instrument, interest rate, stated percentage | 6.875% |  | 6.875% |
Debt instrument, maturity year | 2043 | 2043 |  |
6.50% Junior Subordinated Notes, Due 2029 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt instrument, interest rate, stated percentage | 6.50% |  | 6.50% |
Debt instrument, maturity year |  | 2029 |  |
European Facility [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Short-term Debt |  | $ 23 |  |

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