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Debt and Financing Arrangements (Tables) | 9 Months Ended
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Jun. 30, 2017
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 nine month periods ended June 30, 2017 and 2016 contained the following components (in millions):
| Three Months Ended June 30, |  | Nine Months Ended June 30,
| 2017 |  | 2016 |  | 2017 |  | 2016
Interest expense, net of capitalized interest costs | $ | 115 |  |  | $ | 66 |  |  | $ | 343 |  |  | $ | 203 |
Banking fees and bond cost amortization | 14 |  |  | 7 |  |  | 55 |  |  | 19 |
Interest income | (4 | ) |  | (4 | ) |  | (16 | ) |  | (8 | )
Net foreign exchange results for financing activities | (1 | ) |  | (4 | ) |  | (6 | ) |  | (12 | )
Net financing charges | $ | 124 |  |  | $ | 65 |  |  | $ | 376 |  |  | $ | 202 |
Net financing charges for the nine month period ended June 30, 2017 included $17 million of transaction costs related primarily to the debt exchange offers.

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