Item 3. Quantitative and Qualitative Disclosures About Market Risk
ITEM 3. QUANTITATIVE AND QUALITATIVE DISCLOSURES ABOUT MARKET RISK.
There have been no material changes in market risk from the information provided in Part II, Item 7A, Quantitative and Qualitative Disclosures About Market Risk, in our 2019 Form 10-K other than related to interest rates, as discussed below.
Interest Rates. Our net income is affected by fluctuations in interest rates (e.g. interest expense on variable rate debt). The Company's policy is to manage interest rate risk through a combination of fixed and variable rate debt.
At September 30, 2020, we had $15 billion of fixed-rate debt and $12 billion of variable-rate debt. An increase of 100 basis points in average annual interest rates on September 30, 2020 would have decreased the estimated fair value of our fixed-rate debt by approximately $823 million as of such date and would have increased the annual interest expense on our variable-rate debt by approximately $79 million.
As announced in July 2017, LIBOR is expected to be phased out by the end of 2021. Uncertainty as to the nature of alternative reference rates and as to potential changes or other reforms to LIBOR may adversely impact our interest rates and related interest expense.
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