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Debt - Extinguishments of Debt (Details) € in Millions, $ in Millions | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Sep. 30, 2022 USD ($) | Sep. 30, 2023 USD ($) | Sep. 30, 2022 USD ($) | Sep. 30, 2021 USD ($) | Sep. 30, 2023 EUR (€)
Extinguishment of Debt [Line Items] |  |  |  |  |
Long-Term Debt | $ 13,886 | $ 14,738 | $ 13,886 |  |
Extinguishment of Debt, Gain (Loss), Net of Tax |  | $ 0 | 24 | $ 178 |
0.000% Notes due August 13, 2023 |  |  |  |  |
Extinguishment of Debt [Line Items] |  |  |  |  |
Interest rate |  | 0.00% |  |  | 0.00%
0.000% Notes due August 13, 2023 | Euro Member Countries, Euro |  |  |  |  |
Extinguishment of Debt [Line Items] |  |  |  |  |
Debt Instrument, Repurchased Face Amount | € |  |  |  |  | € 400
0.000% Notes due August 13, 2023 | United States of America, Dollars |  |  |  |  |
Extinguishment of Debt [Line Items] |  |  |  |  |
Debt Instrument, Repurchased Face Amount |  | $ 439 |  |  |
0.632% Notes due June 4, 2023 |  |  |  |  |
Extinguishment of Debt [Line Items] |  |  |  |  |
Debt Instrument, Repurchased Face Amount |  | $ 857 |  |  |
Interest rate |  | 0.632% |  |  | 0.632%
0.632% Notes due June 4, 2023 | Euro Member Countries, Euro |  |  |  |  |
Extinguishment of Debt [Line Items] |  |  |  |  |
Debt Instrument, Repurchased Face Amount | € |  |  |  |  | € 800
1.401% Notes due May 24, 2023 |  |  |  |  |
Extinguishment of Debt [Line Items] |  |  |  |  |
Interest rate |  | 1.401% |  |  | 1.401%
1.401% Notes due May 24, 2023 | Euro Member Countries, Euro |  |  |  |  |
Extinguishment of Debt [Line Items] |  |  |  |  |
Debt Instrument, Repurchased Face Amount | € |  |  |  |  | € 300
1.401% Notes due May 24, 2023 | United States of America, Dollars |  |  |  |  |
Extinguishment of Debt [Line Items] |  |  |  |  |
Debt Instrument, Repurchased Face Amount |  | $ 325 |  |  |
1.000% Notes due December 15, 2022 |  |  |  |  |
Extinguishment of Debt [Line Items] |  |  |  |  |
Interest rate |  | 1.00% |  |  | 1.00%
1.000% Notes due December 15, 2022 | Euro Member Countries, Euro |  |  |  |  |
Extinguishment of Debt [Line Items] |  |  |  |  |
Debt Instrument, Repurchased Face Amount | € |  |  |  |  | € 500
1.000% Notes due December 15, 2022 | United States of America, Dollars |  |  |  |  |
Extinguishment of Debt [Line Items] |  |  |  |  |
Debt Instrument, Repurchased Face Amount |  | $ 528 |  |  |
3.794% Notes due May 20, 2050 |  |  |  |  |
Extinguishment of Debt [Line Items] |  |  |  |  |
Debt Instrument, Repurchased Face Amount | 190 |  | 190 |  |
Interest rate |  | 3.794% |  |  | 3.794%
Long-Term Debt | 554 | $ 554 | 554 |  |
Debt Instrument, Repurchase Amount | 163 |  | 163 |  |
Extinguishment of Debt, Gain (Loss), Net of Tax | (25) |  |  |  |
3.794% Notes due May 20, 2050 | Long-term Debt |  |  |  |  |
Extinguishment of Debt [Line Items] |  |  |  |  |
Long-Term Debt | 188 |  | 188 |  |
7.000% Debentures due August 1, 2027 |  |  |  |  |
Extinguishment of Debt [Line Items] |  |  |  |  |
Debt Instrument, Repurchased Face Amount | 52 |  | 52 |  |
Interest rate |  | 7.00% |  |  | 7.00%
Long-Term Debt | 119 | $ 119 | 119 |  |
Debt Instrument, Repurchase Amount | 59 |  | 59 |  |
Extinguishment of Debt, Gain (Loss), Net of Tax | 5 |  |  |  |
7.000% Debentures due August 1, 2027 | Long-term Debt |  |  |  |  |
Extinguishment of Debt [Line Items] |  |  |  |  |
Long-Term Debt | 54 |  | 54 |  |
6.700% Debentures due August 1, 2028 |  |  |  |  |
Extinguishment of Debt [Line Items] |  |  |  |  |
Debt Instrument, Repurchased Face Amount | 55 |  | 55 |  |
Interest rate |  | 6.70% |  |  | 6.70%
Long-Term Debt | 116 | $ 115 | 116 |  |
Debt Instrument, Repurchase Amount | 62 |  | 62 |  |
Extinguishment of Debt, Gain (Loss), Net of Tax | 5 |  |  |  |
6.700% Debentures due August 1, 2028 | Long-term Debt |  |  |  |  |
Extinguishment of Debt [Line Items] |  |  |  |  |
Long-Term Debt | 56 |  | 56 |  |
6.000% Notes due May 15, 2039 |  |  |  |  |
Extinguishment of Debt [Line Items] |  |  |  |  |
Debt Instrument, Repurchased Face Amount | 127 |  | 127 |  |
Interest rate |  | 6.00% |  |  | 6.00%
Long-Term Debt | 121 | $ 121 | 121 |  |
Debt Instrument, Repurchase Amount | 145 |  | 145 |  |
Extinguishment of Debt, Gain (Loss), Net of Tax | 20 |  |  |  |
6.000% Notes due May 15, 2039 | Long-term Debt |  |  |  |  |
Extinguishment of Debt [Line Items] |  |  |  |  |
Long-Term Debt | 125 |  | 125 |  |
5.000% Notes due November 12, 2040 |  |  |  |  |
Extinguishment of Debt [Line Items] |  |  |  |  |
Debt Instrument, Repurchased Face Amount | 34 |  | 34 |  |
Interest rate |  | 5.00% |  |  | 5.00%
Long-Term Debt | 90 | $ 90 | 90 |  |
Debt Instrument, Repurchase Amount | 35 |  | 35 |  |
Extinguishment of Debt, Gain (Loss), Net of Tax | 1 |  |  |  |
5.000% Notes due November 12, 2040 | Long-term Debt |  |  |  |  |
Extinguishment of Debt [Line Items] |  |  |  |  |
Long-Term Debt | 34 |  | 34 |  |
4.685% Notes due December 15, 2044 |  |  |  |  |
Extinguishment of Debt [Line Items] |  |  |  |  |
Debt Instrument, Repurchased Face Amount | 42 |  | 42 |  |
Interest rate |  | 4.685% |  |  | 4.685%
Long-Term Debt | 911 | $ 899 | 911 |  |
Debt Instrument, Repurchase Amount | 42 |  | 42 |  |
Extinguishment of Debt, Gain (Loss), Net of Tax | (1) |  |  |  |
4.685% Notes due December 15, 2044 | Long-term Debt |  |  |  |  |
Extinguishment of Debt [Line Items] |  |  |  |  |
Long-Term Debt | $ 43 |  | $ 43 |  |

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