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Long-Term Debt (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2019
Debt Instrument [Line Items] |  |  |
Long-term debt | $ 6,331 | $ 6,648 |
Less: Current maturities | 538 | 322 |
Total, net | 5,793 | 6,326 |
Long-term debt maturing during year two | 505 |  |
Long-term debt maturing during year three | 592 |  |
Long-term debt maturing during year four | 497 |  |
Long-term debt maturing during year five | 577 |  |
Interest paid related to long-term debt | 156 | 163 | $ 195
4.875% notes due October 2019 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Repayments of Debt |  | $ 500 |
Notes interest rate, percentage |  | 4.875% |
4.25% notes due November 2020 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt | 0 | $ 300 |
Repayments of Debt | $ 300 |  |
Notes interest rate, percentage | 4.25% |  |
2.625% notes due December 2021 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt | $ 500 | 500 |
2.625% notes due February 2023 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt | 500 | 500 |
0.375% notes due May 2024 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt | 579 | 586 |
3.15% notes Due June 2025 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt | 500 | 500 |
1.25% notes due October 2025 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt | 579 | 586 |
0.875% Notes Due October 2026 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt | 750 | $ 750 |
Notes interest rate, percentage |  | 0.875% |
Proceeds from issuance of debt |  | $ 750 |
1.8% Notes Due October 2027 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt | 500 | $ 500 |
Notes interest rate, percentage |  | 1.80% |
Proceeds from issuance of debt |  | $ 500 |
2.0% notes due October 2029 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt | 579 | 586 |
1.95% Notes Due October 2030 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt | 500 | $ 500 |
Notes interest rate, percentage |  | 1.95% |
Proceeds from issuance of debt |  | $ 500 |
6.0% notes due August 2032 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt | 250 | 250 |
6.125% notes due April 2039 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt | 250 | 250 |
5.25% notes due November 2039 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt | 300 | 300 |
2.75% Notes Due October 2050 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt | 500 | $ 500 |
Notes interest rate, percentage |  | 2.75% |
Proceeds from issuance of debt |  | $ 500 |
Other [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt | $ 44 | $ 40 |

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