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Debt and Financing Arrangements (Tables) | 6 Months Ended
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Mar. 31, 2020
Debt Disclosure [Abstract] |
Components of Net Financing Charges | The Company's net financing charges line item in the consolidated statements of income for the three and six months ended March 31, 2020 and 2019 contained the following components (in millions):
| Three Months Ended March 31, |  | Six Months Ended March 31,
| 2020 |  | 2019 |  | 2020 |  | 2019
Interest expense, net of capitalized interest costs | $ | 62 |  |  | $ | 97 |  |  | $ | 124 |  |  | $ | 188 |
Banking fees and bond cost amortization | 5 |  |  | 7 |  |  | 10 |  |  | 13 |
Interest income | (5 | ) |  | (6 | ) |  | (18 | ) |  | (13 | )
Net foreign exchange results for financing activities | (3 | ) |  | — |  |  | (5 | ) |  | (5 | )
Net financing charges | $ | 59 |  |  | $ | 98 |  |  | $ | 111 |  |  | $ | 183 |

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