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v3.20.2

Debt - Summary of Current and Long-term Debt (Parenthetical) (Details) $ in Millions | 9 Months Ended |  |  |
--- | --- | --- | --- | ---
Jun. 30, 2020 USD ($) | Jun. 30, 2020 EUR (€) | Jan. 31, 2020 EUR (€) | Sep. 30, 2019 USD ($)
Debt Instrument [Line Items] |  |  |  |
Unamortized debt issuance expense, long-term debt | $ 15 |  |  | $ 12
Short-term debt outstanding balance | $ 446 |  |  | 166
4.750% Notes due 2022 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt instrument, interest rate, stated percentage | 4.75% | 4.75% |  |
Debt instrument, maturity year | 2022 |  |  |
2.00% Senior Notes Due 2028 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt instrument, interest rate, stated percentage | 2.00% | 2.00% | 2.00% |
Debt instrument, maturity year | 2028 |  |  |
Principal amount | € |  | € 500,000,000 | € 500,000,000 |
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 |  |  |
Term Loan A due 2025 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt instrument, maturity year | 2025 |  |  |
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 outstanding balance | $ 22 |  |  | $ 22

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