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Debt and Other Financing Activities - Summary of Current and Long-term Debt (Details) - USD ($) $ in Millions | Mar. 31, 2022 | Sep. 30, 2021
--- | --- | ---
Debt Instrument [Line Items] |  |  |
Carrying value of debt |  | $ 1,352 | $ 1,622
Other | [1] | (13) | 9
Total debt |  | 1,336 | 1,970
Short-term debt (includes current portion of long-term debt) |  | 0 | (374)
Long-term debt (less current portion) |  | 1,336 | 1,596
3.375% Senior Notes, due 2031 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Carrying value of debt |  | 450 | 450
2.00% Senior Notes Due 2028 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Carrying value of debt |  | 558 | 580
6.875% Notes due 2043 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Carrying value of debt |  | 282 | 282
Term Loan A [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Carrying value of debt |  | 0 | 250
Accounts Receivable Securitization [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Carrying value of debt |  | 0 | 117
6.50% Junior Subordinated Notes, Due 2029 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Carrying value of debt |  | 59 | 57
Revolving Credit Facility [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Carrying value of debt |  | $ 0 | $ 225
[1] | Includes $16 million and $17 million of debt issuance cost discounts as of March 31, 2022 and September 30, 2021, respectively. Additionally, at September 30, 2021, Other included a European short-term loan facility with an outstanding balance of $23 million.

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