The estimated fair values presented below have been determined by using available market information and by applying valuation methodologies. Considerable judgment is applied in interpreting data to develop the estimates of fair value. Estimated fair values may not be realized in a current market exchange. The use of different market assumptions and/or estimation methodologies could have a material effect on the estimated fair values. The methods and assumptions discussed below were used in calculating the estimated fair values of the instruments. See Note 19 for a discussion of derivative instruments.
Fixed Maturities and Equity Securities
Estimated fair values for fixed maturities and equity securities, other than private placement securities, are based on quoted market prices or estimates from independent pricing services. Generally, fair values for private placement fixed maturities are estimated using a discounted cash flow model which considers the current market spreads between the U.S. Treasury yield curve and corporate bond yield curve, adjusted for the type of issue, its current credit quality and its remaining average life. The fair value of certain non-performing private placement fixed maturities is based on amounts estimated by management.
Commercial Loans
The estimated fair value of commercial loans is primarily based upon the present value of the expected future cash flows discounted at the appropriate U.S. Treasury rate or Japanese Government Bond rate for yen based loans, adjusted for the current market spread for similar quality loans.
Policy Loans
The estimated fair value of policy loans is calculated using a discounted cash flow model based upon current U.S. Treasury rates and historical loan repayment patterns.
Mortgage Securitization Inventory
The estimated fair value of the mortgage securitization inventory is primarily based upon the intended exit strategy for the mortgage loans, including securitization and whole loan sales. For loans expected to be securitized, the value is estimated using a pricing model that, among other factors, considers current investor yield requirements for subordination and yield.
Investment Contracts
For guaranteed investment contracts, income annuities, and other similar contracts without life contingencies, estimated fair values are derived using discounted projected cash flows based on interest rates being offered for similar contracts with maturities consistent with those of the contracts being valued. For individual deferred annuities and other deposit liabilities, fair value approximates carrying value.
Debt
The estimated fair value of short-term and long-term debt is derived by using discount rates based on the borrowing rates currently available to the Company for debt with similar terms and remaining maturities.
The following table discloses the carrying amounts and estimated fair values of the Company's financial instruments at December 31,