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Debt and Financing Arrangements (Tables) | 6 Months Ended
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Mar. 31, 2022
Debt Disclosure [Abstract] |
Components of Net Financing Charges | Net financing charges consisted of the following (in millions):
| Three Months Ended March 31, |  | Six Months Ended March 31,
| 2022 |  | 2021 |  | 2022 |  | 2021
Interest expense, net of capitalized interest costs | $ | 56 |  |  | $ | 53 |  |  | $ | 111 |  |  | $ | 112 |
Banking fees and bond cost amortization | 5 |  |  | 4 |  |  | 10 |  |  | 12 |
Interest income | (1) |  |  | (3) |  |  | (3) |  |  | (6) |
Net foreign exchange results for financing activities | (9) |  |  | (10) |  |  | (14) |  |  | (15) |
Net financing charges | $ | 51 |  |  | $ | 44 |  |  | $ | 104 |  |  | $ | 103 |

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