Item 3. Quantitative and Qualitative Disclosures About Market Risk

Information on our utilization of financial instruments and an analysis of the sensitivity of these instruments to selected changes in market rates and prices is included in our 2021 Form 10-K.

Our net financial instrument position decreased from a liability of $7,850.3 at 30 September 2021 to a liability of $6,997.1 at 31 March 2022. The decrease was primarily due to the effect of higher U.S. Dollar interest rates on the fair value of outstanding U.S. Dollar-denominated fixed-rate notes and the repayment of a $400.0 million U.S. Dollar-denominated note on its maturity date in November 2021.

Interest Rate Risk

Our debt portfolio as of 31 March 2022, including the effect of currency and interest rate swap agreements, was composed of 80% fixed-rate debt and 20% variable-rate debt. Our debt portfolio as of 30 September 2021, including the effect of currency and interest rate swap agreements, was composed of 89% fixed-rate debt and 11% variable-rate debt. The increase in variable-rate debt is the result of a $600 million increase in the outstanding notional of fixed-to-variable interest rate swaps.

The sensitivity analysis related to the interest rate risk on the fixed portion of our debt portfolio assumes an instantaneous 100 bp move in interest rates from the level at 31 March 2022, with all other variables held constant. A 100 bp increase in market interest rates would result in a decrease of $475 and $587 in the net liability position of financial instruments at 31 March 2022 and 30 September 2021, respectively. A 100 bp decrease in market interest rates would result in an increase of $562 and $692 in the net liability position of financial instruments at 31 March 2022 and 30 September 2021.

There were no material changes to the sensitivity analysis related to the variable portion of our debt portfolio since 30 September 2021.

Foreign Currency Exchange Rate Risk

The sensitivity analysis related to foreign currency exchange rates assumes an instantaneous 10% change in foreign currency exchange rates from their levels at 31 March 2022, with all other variable held constant. A 10% strengthening or weakening of the functional currency of an entity versus all other currencies would result in a decrease or increase, respectively, of $303 and $343 in the net liability position of financial instruments at 31 March 2022 and 30 September 2021, respectively.