|MEDTRONIC PLC filed this Form 10-Q on 09/01/2017|
will satisfy our foreseeable operating needs for at least the next 12 months. We regularly review our capital needs and consider various investing and financing alternatives to support our requirements.
Standard & Poor's Ratings Services (S&P) and Moody's Investors Service (Moody's) long-term debt ratings and short-term debt ratings at July 28, 2017 were unchanged as compared to the ratings at April 28, 2017. We do not expect the S&P and Moody's ratings to have a significant impact on our liquidity or future flexibility to access additional liquidity given our balance sheet and our $3.5 billion revolving credit facility and related commercial paper program.
We have future contractual obligations and other minimum commercial commitments that are entered into in the normal course of business. We believe our off-balance sheet arrangements do not have a material current or anticipated future effect on our consolidated earnings, financial position, and/or cash flows.
Note 16 to the consolidated financial statements provides information regarding amounts we have accrued related to significant legal proceedings. In accordance with U.S. GAAP, we record a liability in our consolidated financial statements for these matters when a loss is known or considered probable and the amount can be reasonably estimated. Actual settlements may be different than estimated and could have a material impact on our consolidated earnings, financial position, and/or cash flows.
We record tax liabilities in our consolidated financial statements for amounts that we expect to repatriate from subsidiaries (to the extent the repatriation would be subject to tax); however, no tax liabilities are recorded for amounts that we consider to be permanently reinvested. Our current plans do not foresee a need to repatriate funds that are designated as permanently reinvested in order to fund our operations or meet currently anticipated liquidity and capital investment needs. However, we evaluate our legal entity structure supporting our business operations, and to the extent such evaluation results in a change to our overall business structure, we may be required to accrue for additional tax obligations.
We have investments in marketable debt securities that are classified and accounted for as available-for-sale. Our debt securities include U.S. government and agency securities, corporate debt securities, mortgage-backed securities, other asset-backed securities, debt funds, and auction rate securities. Some of our investments may experience reduced liquidity due to changes in market conditions and investor demand. Our auction rate security holdings continue to experience reduced liquidity due to low investor demand. Although our auction rate securities are currently illiquid and other securities could become illiquid, we believe we could liquidate a substantial amount of our portfolio without incurring a material impairment loss.
For the three months ended July 28, 2017, the total other-than-temporary impairment losses on available-for-sale debt securities were not significant. Based on our assessment of the credit quality of the underlying collateral and credit support available to each of the remaining securities in which we are invested, we believe we have recognized all necessary other-than-temporary impairments as we do not have the intent to sell, nor is it more likely than not that we will be required to sell, before recovery of the amortized cost. At July 28, 2017, we have $215 million of gross unrealized losses on our aggregate current and noncurrent available-for-sale debt securities of $8.4 billion. If market conditions deteriorate, some of these holdings may experience other-than-temporary impairment in the future, which could adversely impact our financial results. We are required to use estimates and assumptions in our valuation of investments, which requires a high degree of judgment, and therefore, actual results could differ materially from estimates. See Note 6 to the current period's consolidated financial statements for additional information regarding fair value measurements.