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Debt and Financing Arrangements (Tables) | 9 Months Ended
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Jun. 30, 2021
Debt Disclosure [Abstract] |
Components of Net Financing Charges | Net financing charges consisted of the following (in millions):
| Three Months Ended June 30, |  | Nine Months Ended June 30,
| 2021 |  | 2020 |  | 2021 |  | 2020
Interest expense, net of capitalized interest costs | $ | 55 |  |  | $ | 58 |  |  | $ | 167 |  |  | $ | 182 |
Banking fees and bond cost amortization | 7 |  |  | 8 |  |  | 19 |  |  | 18 |
Interest income | (1) |  |  | (3) |  |  | (7) |  |  | (21) |
Net foreign exchange results for financing activities | (5) |  |  | (5) |  |  | (20) |  |  | (10) |
Net financing charges | $ | 56 |  |  | $ | 58 |  |  | $ | 159 |  |  | $ | 169 |

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