Significant Accounting Policies and Pronouncements	9 Months Ended
Sep. 30, 2013
Accounting Policies [Abstract]
Significant Accounting Policies and Pronouncements	2. SIGNIFICANT ACCOUNTING POLICIES AND PRONOUNCEMENTS Investments in Debt and Equity Securities and Commercial Mortgage and Other Loans The Company's investments in debt and equity securities include fixed maturities, equity securities, and short-term investments. The accounting policies related to these, as well as commercial mortgage and other loans, are as follows: Fixed maturities are comprised of bonds, notes and redeemable preferred stock. Fixed maturities classified as “available-for-sale” are carried at fair value. See Note 4 for additional information regarding the determination of fair value. Fixed maturities that the Company has both the positive intent and ability to hold to maturity are carried at amortized cost and classified as “held-to-maturity.” The amortized cost of fixed maturities is adjusted for amortization of premiums and accretion of discounts to maturity. Interest income, as well as the related amortization of premium and accretion of discount is included in “Net investment income” under the effective yield method. For mortgage-backed and asset-backed securities, the effective yield is based on estimated cash flows, including interest rate and prepayment assumptions based on data from widely accepted third-party data sources or internal estimates. In addition to interest rate and prepayment assumptions, cash flow estimates also vary based on other assumptions regarding the underlying collateral including default rates and changes in value. These assumptions can significantly impact income recognition and the amount of other-than-temporary impairments recognized in earnings and other comprehensive income. For high credit quality mortgage-backed and asset-backed securities (those rated AA or above), cash flows are provided quarterly, and the amortized cost and effective yield of the security are adjusted as necessary to reflect historical prepayment experience and changes in estimated future prepayments. The adjustments to amortized cost are recorded as a charge or credit to net investment income in accordance with the retrospective method. For mortgage-backed and asset-backed securities rated below AA or those for which an other than temporary impairment has been recorded, the effective yield is adjusted prospectively for any changes in estimated cash flows. See the discussion below on realized investment gains and losses for a description of the accounting for impairments. Unrealized gains and losses on fixed maturities classified as “available-for-sale,” net of tax, and the effect on deferred policy acquisition costs, value of business acquired, deferred sales inducements and future policy benefits that would result from the realization of unrealized gains and losses, are included in “Accumulated other comprehensive income (loss)” (“AOCI”). Trading account assets, at fair value, represents equity securities held in support of a deferred compensation plan and other fixed maturity securities carried at fair value. Realized and unrealized gains and losses for these investments are reported in “Asset administration fees and other income.” Interest and dividend income from these investments is reported in “Net investment income.” Equity securities, available-for-sale are comprised of mutual fund shares and are carried at fair value. The associated unrealized gains and losses, net of tax, and the effect on deferred policy acquisition costs, value of business acquired, deferred sales inducements, and future policy benefits that would result from the realization of unrealized gains and losses, are included in AOCI. The cost of equity securities is written down to fair value when a decline in value is considered to be other-than-temporary. See the discussion below on realized investment gains and losses for a description of the accounting for impairments. Dividends from these investments are recognized in “Net investment income” when earned. Commercial mortgage and other loans consist of commercial mortgage loans, agricultural loans and uncollateralized loans. Commercial mortgage and other loans held for investment are generally carried at unpaid principal balance, net of unamortized deferred loan origination fees and expenses and net of an allowance for losses. Commercial mortgage and other loans acquired, including those related to the acquisition of a business, are recorded at fair value when purchased, reflecting any premiums or discounts to unpaid principal balances. Interest income, as well as prepayment fees and the amortization of the related premiums or discounts, related to commercial mortgage and other loans, are included in “Net investment income.” Impaired loans include those loans for which it is probable that amounts due will not all be collected according to the contractual terms of the loan agreement. The Company defines “past due” as principal or interest not collected at least 30 days past the scheduled contractual due date. Interest received on loans that are past due, including impaired and non-impaired loans, as well as, loans that were previously modified in a troubled debt restructuring, is either applied against the principal or reported as net investment income based on the Company's assessment as to the collectability of the principal. See Note 3 for additional information about the Company's past due loans. The Company discontinues accruing interest on loans after the loans become 90 days delinquent as to principal or interest payments, or earlier when the Company has doubts about collectability. When the Company discontinues accruing interest on a loan, any accrued but uncollectible interest on the loan and other loans backed by the same collateral, if any, is charged to interest income in the same period. Generally, a loan is restored to accrual status only after all delinquent interest and principal are brought current and, in the case of loans where the payment of interest has been interrupted for a substantial period, or the loan has been modified, a regular payment performance has been established. The Company reviews the performance and credit quality of the commercial mortgage and other loan portfolio on an on-going basis. Loans are placed on watch list status based on a predefined set of criteria and are assigned one of three categories. Loans are placed on “early warning” status in cases where, based on the Company's analysis of the loan's collateral, the financial situation of the borrower or tenants or other market factors, it is believed a loss of principal or interest could occur. Loans are classified as “closely monitored” when it is determined that there is a collateral deficiency or other credit events that may lead to a potential loss of principal or interest. Loans “not in good standing” are those loans where the Company has concluded that there is a high probability of loss of principal, such as when the loan is delinquent or in the process of foreclosure. As described below, in determining the allowance for losses, the Company evaluates each loan on the watch list to determine if it is probable that amounts due will not be collected according to the contractual terms of the loan agreement. Loan-to-value and debt service coverage ratios are measures commonly used to assess the quality of commercial mortgage loans. The loan-to-value ratio compares the amount of the loan to the fair value of the underlying property collateralizing the loan, and is commonly expressed as a percentage. Loan-to-value ratios greater than 100% indicate that the loan amount exceeds the collateral value. A smaller loan-to-value ratio indicates a greater excess of collateral value over the loan amount. The debt service coverage ratio compares a property's net operating income to its debt service payments. Debt service coverage ratios less than 1.0 times indicate that property operations do not generate enough income to cover the loan's current debt payments. A larger debt service coverage ratio indicates a greater excess of net operating income over the debt service payments. The values utilized in calculating these ratios are developed as part of the Company's periodic review of the commercial mortgage loan and agricultural loan portfolio, which includes an internal appraisal of the underlying collateral value. The Company's periodic review also includes a quality re-rating process, whereby the internal quality rating originally assigned at underwriting is updated based on current loan, property and market information using a proprietary quality rating system. The loan-to-value ratio is the most significant of several inputs used to establish the internal credit rating of a loan which in turn drives the allowance for losses. Other key factors considered in determining the internal credit rating include debt service coverage ratios, amortization, loan term, estimated market value growth rate and volatility for the property type and region. See Note 3 for additional information related to the loan-to-value ratios and debt service coverage ratios related to the Company's commercial mortgage and agricultural loan portfolios. The allowance for losses on commercial mortgage and other loans can increase or decrease from period to period based on the factors noted above. “Realized investment gains (losses), net” includes changes in the allowance for losses. “Realized investment gains (losses), net” also includes gains and losses on sales, certain restructurings, and foreclosures. When a commercial mortgage or other loan is deemed to be uncollectible, any specific valuation allowance associated with the loan is reversed and a direct write down to the carrying amount of the loan is made. The carrying amount of the loan is not adjusted for subsequent recoveries in value. In situations where a loan has been restructured in a troubled debt restructuring and the loan has subsequently defaulted, this factor is considered when evaluating the loan for a specific allowance for losses in accordance with the credit review process noted above. See Note 3 for additional information about commercial mortgage and other loans that have been restructured in a troubled debt restructuring. Short-term investments primarily consist of highly liquid debt instruments with a maturity of twelve months or less and greater than three months when purchased. These investments are generally carried at fair value and include certain money market investments, short-term debt securities issued by government sponsored entities and other highly liquid debt instruments. Realized investment gains (losses) are computed using the specific identification method. Realized investment gains and losses are generated from numerous sources, including the sale of fixed maturity securities, equity securities, investments in joint ventures and limited partnerships and other types of investments, as well as adjustments to the cost basis of investments for net other-than-temporary impairments recognized in earnings. Realized investment gains and losses are also generated from prepayment premiums received on private fixed maturity securities, allowance for losses on commercial mortgage and other loans, and fair value changes on embedded derivatives and free-standing derivatives that do not qualify for hedge accounting treatment. See “Derivative Financial Instruments” below for additional information regarding the accounting for derivatives. The Company's available-for-sale securities with unrealized losses are reviewed quarterly to identify other-than-temporary impairments in value. In evaluating whether a decline in value is other-than-temporary, the Company considers several factors including, but not limited to the following: (1) the extent and the duration of the decline; (2) the reasons for the decline in value (credit event, currency or interest-rate related, including general credit spread widening); and (3) the financial condition of and near-term prospects of the issuer. With regard to available-for-sale equity securities, the Company also considers the ability and intent to hold the investment for a period of time to allow for a recovery of value. When it is determined that a decline in value of an equity security is other-than-temporary, the carrying value of the equity security is reduced to its fair value, with a corresponding charge to earnings. An other-than-temporary impairment is recognized in earnings for a debt security in an unrealized loss position when the Company either (a) has the intent to sell the debt security or (b) more likely than not will be required to sell the debt security before its anticipated recovery. For all debt securities in unrealized loss positions that do not meet either of these two criteria, the Company analyzes its ability to recover the amortized cost by comparing the net present value of projected future cash flows with the amortized cost of the security. The net present value is calculated by discounting the Company's best estimate of projected future cash flows at the effective interest rate implicit in the debt security prior to impairment. The Company may use the estimated fair value of collateral as a proxy for the net present value if it believes that the security is dependent on the liquidation of collateral for recovery of its investment. If the net present value is less than the amortized cost of the investment an other-than-temporary impairment is recognized. When an other-than-temporary impairment of a debt security has occurred, the amount of the other-than-temporary impairment recognized in earnings depends on whether the Company intends to sell the security or more likely than not will be required to sell the security before recovery of its amortized cost basis. If the debt security meets either of these two criteria, the other-than-temporary impairment recognized in earnings is equal to the entire difference between the security's amortized cost basis and its fair value at the impairment measurement date. For other-than-temporary impairments of debt securities that do not meet these criteria, the net amount recognized in earnings is equal to the difference between the amortized cost of the debt security and its net present value calculated as described above. Any difference between the fair value and the net present value of the debt security at the impairment measurement date is recorded in “Other comprehensive income (loss)” (“OCI”). Unrealized gains or losses on securities for which an other-than-temporary impairment has been recognized in earnings is tracked as a separate component of AOCI. For debt securities, the split between the amount of an other-than-temporary impairment recognized in other comprehensive income and the net amount recognized in earnings is driven principally by assumptions regarding the amount and timing of projected cash flows. For mortgage-backed and asset-backed securities, cash flow estimates consider the payment terms of the underlying assets backing a particular security, including interest rate and prepayment assumptions, based on data from widely accepted third-party data sources or internal estimates. In addition to interest rate and prepayment assumptions, cash flow estimates also include other assumptions regarding the underlying collateral including default rates and recoveries, which vary based on the asset type and geographic location, as well as the vintage year of the security. For structured securities, the payment priority within the tranche structure is also considered. For all other debt securities, cash flow estimates are driven by assumptions regarding probability of default and estimates regarding timing and amount of recoveries associated with a default. The Company has developed these estimates using information based on its historical experience as well as using market observable data, such as industry analyst reports and forecasts, sector credit ratings and other data relevant to the collectability of a security, such as the general payment terms of the security and the security's position within the capital structure of the issuer. The new cost basis of an impaired security is not adjusted for subsequent increases in estimated fair value. In periods subsequent to the recognition of an other-than-temporary impairment, the impaired security is accounted for as if it had been purchased on the measurement date of the impairment. For debt securities, the discount (or reduced premium) based on the new cost basis may be accreted into net investment income in future periods, including increases in cash flow on a prospective basis. In certain cases where there are decreased cash flow expectations, the security is reviewed for further cash flow impairments. Derivative Financial Instruments Derivatives are financial instruments whose values are derived from interest rates, foreign exchange rates, financial indices, values of securities or commodities, credit spreads, market volatility, expected returns, and liquidity. Values can also be affected by changes in estimates and assumptions, including those related to counterparty behavior and non-performance risk used in valuation models. Derivative financial instruments generally used by the Company include swaps, futures, forwards and options and may be exchange-traded or contracted in the over-the-counter (“OTC”) market. Derivative positions are carried at fair value, generally by obtaining quoted market prices or through the use of valuation models. Derivatives are used to manage the interest rate and currency characteristics of assets or liabilities. Additionally, derivatives may be used to seek to reduce exposure to interest rate, credit, foreign currency and equity risks associated with assets held or expected to be purchased or sold, and liabilities incurred or expected to be incurred. As discussed in detail below and in Note 5, all realized and unrealized changes in fair value of derivatives are recorded in current earnings, with the exception of the effective portion of cash flow hedges. Cash flows from derivatives are reported in the operating, investing, or financing activities sections in the Unaudited Interim Statements of Cash Flows based on the nature and purpose of the derivative. Derivatives are recorded either as assets, within “Other trading account assets, at fair value” or “Other long-term investments,” or as liabilities, within “Other liabilities,” except for embedded derivatives which are recorded with the associated host contract. The Company nets the fair value of all derivative financial instruments with counterparties for which a master netting arrangement has been executed. The Company designates derivatives as either (1) a hedge of a forecasted transaction or of the variability of cash flows to be received or paid related to a recognized asset or liability (“cash flow” hedge); or (2) a derivative that does not qualify for hedge accounting. To qualify for hedge accounting treatment, a derivative must be highly effective in mitigating the designated risk of the hedged item. Effectiveness of the hedge is formally assessed at inception and throughout the life of the hedging relationship. Even if a derivative qualifies for hedge accounting treatment, there may be an element of ineffectiveness of the hedge. Under such circumstances, the ineffective portion is recorded in “Realized investment gains (losses), net.” The Company formally documents at inception all relationships between hedging instruments and hedged items, as well as its risk-management objective and strategy for undertaking various hedge transactions. This process includes linking all derivatives designated as cash flow hedges to specific assets and liabilities on the balance sheet or to specific firm commitments or forecasted transactions. When a derivative is designated as a cash flow hedge and is determined to be highly effective, changes in its fair value are recorded in AOCI until earnings are affected by the variability of cash flows being hedged (e.g., when periodic settlements on a variable-rate asset or liability are recorded in earnings). At that time, the related portion of deferred gains or losses on the derivative instrument is reclassified and reported in the income statement line item associated with the hedged item. If it is determined that a derivative no longer qualifies as an effective cash flow hedge or management removes the hedge designation, the derivative will continue to be carried on the balance sheet at its fair value, with changes in fair value recognized currently in “Realized investment gains (losses), net.” The component of AOCI related to discontinued cash flow hedges is reclassified to the income statement line associated with the hedged cash flows consistent with the earnings impact of the original hedged cash flows. When hedge accounting is discontinued because the hedged item no longer meets the definition of a firm commitment, or because it is probable that the forecasted transaction will not occur by the end of the specified time period, the derivative will continue to be carried on the balance sheet at its fair value, with changes in fair value recognized currently in “Realized investment gains (losses), net.” Any asset or liability that was recorded pursuant to recognition of the firm commitment is removed from the balance sheet and recognized currently in “Realized investment gains (losses), net.” Gains and losses that were in AOCI pursuant to the hedge of a forecasted transaction are recognized immediately in “Realized investment gains (losses), net.” If a derivative does not qualify for hedge accounting, all changes in its fair value, including net receipts and payments, are included in “Realized investment gains (losses), net” without considering changes in the fair value of the economically associated assets or liabilities. The Company is a party to financial instruments that contain derivative instruments that are “embedded” in the financial instruments. At inception, the Company assesses whether the economic characteristics of the embedded instrument are clearly and closely related to the economic characteristics of the remaining component of the financial instrument (i.e., the host contract) and whether a separate instrument with the same terms as the embedded instrument would meet the definition of a derivative instrument. When it is determined that (1) the embedded instrument possesses economic characteristics that are not clearly and closely related to the economic characteristics of the host contract, and (2) a separate instrument with the same terms would qualify as a derivative instrument, the embedded instrument qualifies as an embedded derivative that is separated from the host contract, carried at fair value, and changes in its fair value are included in “Realized investment gains (losses), net.” For certain financial instruments that contain an embedded derivative that otherwise would need to be bifurcated and reported at fair value, the Company may elect to classify the entire instrument as a trading account asset and report it within “Trading account assets, at fair value.” The Company sold variable annuity contracts that include optional living benefit features that may be treated from an accounting perspective as embedded derivatives. The Company has reinsurance agreements to transfer the risk related to certain of these benefit features to an affiliate, Pruco Re. The embedded derivatives related to the living benefit features and the related reinsurance agreements are carried at fair value and included in “Future policy benefits and other policyholder liabilities” and “Reinsurance recoverables,” respectively. Changes in the fair value are determined using valuation models as described in Note 4, and are recorded in “Realized investment gains (losses), net.” Income taxes The Company determines its interim tax provision using the annual effective tax rate methodology in accordance with the authoritative guidance. The increase in the income tax expense for the three and nine months ended September 30, 2013 and change in effective tax rate was primarily driven by an increase in pre-tax income for the three and nine months ended September 30, 2013 compared to the three and nine months ended September 30, 2012. Adoption of New Accounting Pronouncements In December 2011 and January 2013, the Financial Accounting Standards Board (“FASB”) issued updated guidance regarding the disclosure of recognized derivative instruments (including bifurcated embedded derivatives), repurchase agreements and securities borrowing/lending transactions that are offset in the statement of financial position or are subject to an enforceable master netting arrangement or similar agreement (irrespective of whether they are offset in the statement of financial position). This new guidance requires an entity to disclose information on both a gross and net basis about instruments and transactions within the scope of this guidance. This new guidance is effective for interim or annual reporting periods beginning on or after January 1, 2013, and should be applied retrospectively for all comparative periods presented. The disclosures required by this guidance are included in Note 5. In February 2013, the FASB issued updated guidance regarding the presentation of comprehensive income. Under the guidance, an entity is required to separately present information about significant items reclassified out of accumulated other comprehensive income by component as well as changes in accumulated other comprehensive income balances by component in either the financial statements or the notes to the financial statements. The guidance does not change the items that are reported in other comprehensive income, does not change when an item of other comprehensive income must be reclassified to net income, and does not amend any existing requirements for reporting net income or other comprehensive income. The guidance is effective for the first interim or annual reporting period beginning after December 15, 2012 and should be applied prospectively. The disclosures required by this guidance are included in Note 3. In July 2013, the FASB issued new guidance regarding derivatives. The guidance permits the Fed Funds Effective Swap Rate (or Overnight Index Swap Rate) to be used as a U.S. benchmark interest rate for hedge accounting, in addition to the United States Treasury rate and London Inter-Bank Offered Rate (“LIBOR”). The guidance also removes the restriction on using different benchmark rates for similar hedges. The guidance is effective for qualifying new or redesignated hedging relationships entered into on or after July 17, 2013 and should be applied prospectively. Adoption of the guidance did not have a significant effect on the Company's financial position, results of operations, and financial statement disclosures. Future Adoption of New Accounting Pronouncements In July 2013, the FASB issued updated guidance regarding the presentation of unrecognized tax benefits when net operating loss carryforwards, similar tax losses, or tax credit carryforwards exist. This new guidance is effective for interim or annual reporting periods that begin after December 15, 2013, and should be applied prospectively, with early application permitted. This guidance is not expected to have a significant effect on the Company's financial position, results of operations, and financial statement disclosures.

Significant Accounting Policies and Pronouncements

9 Months Ended

Sep. 30, 2013

Significant Accounting Policies and Pronouncements

2. SIGNIFICANT ACCOUNTING POLICIES AND PRONOUNCEMENTS

Investments in Debt and Equity Securities and Commercial Mortgage and Other Loans

The Company's investments in debt and equity securities include fixed maturities, equity securities, and short-term investments. The accounting policies related to these, as well as commercial mortgage and other loans, are as follows:

Fixed maturities are comprised of bonds, notes and redeemable preferred stock. Fixed maturities classified as “available-for-sale” are carried at fair value. See Note 4 for additional information regarding the determination of fair value. Fixed maturities that the Company has both the positive intent and ability to hold to maturity are carried at amortized cost and classified as “held-to-maturity.” The amortized cost of fixed maturities is adjusted for amortization of premiums and accretion of discounts to maturity. Interest income, as well as the related amortization of premium and accretion of discount is included in “Net investment income” under the effective yield method. For mortgage-backed and asset-backed securities, the effective yield is based on estimated cash flows, including interest rate and prepayment assumptions based on data from widely accepted third-party data sources or internal estimates. In addition to interest rate and prepayment assumptions, cash flow estimates also vary based on other assumptions regarding the underlying collateral including default rates and changes in value. These assumptions can significantly impact income recognition and the amount of other-than-temporary impairments recognized in earnings and other comprehensive income. For high credit quality mortgage-backed and asset-backed securities (those rated AA or above), cash flows are provided quarterly, and the amortized cost and effective yield of the security are adjusted as necessary to reflect historical prepayment experience and changes in estimated future prepayments. The adjustments to amortized cost are recorded as a charge or credit to net investment income in accordance with the retrospective method. For mortgage-backed and asset-backed securities rated below AA or those for which an other than temporary impairment has been recorded, the effective yield is adjusted prospectively for any changes in estimated cash flows. See the discussion below on realized investment gains and losses for a description of the accounting for impairments. Unrealized gains and losses on fixed maturities classified as “available-for-sale,” net of tax, and the effect on deferred policy acquisition costs, value of business acquired, deferred sales inducements and future policy benefits that would result from the realization of unrealized gains and losses, are included in “Accumulated other comprehensive income (loss)” (“AOCI”).

Trading account assets, at fair value, represents equity securities held in support of a deferred compensation plan and other fixed maturity securities carried at fair value. Realized and unrealized gains and losses for these investments are reported in “Asset administration fees and other income.” Interest and dividend income from these investments is reported in “Net investment income.”

Equity securities, available-for-sale are comprised of mutual fund shares and are carried at fair value. The associated unrealized gains and losses, net of tax, and the effect on deferred policy acquisition costs, value of business acquired, deferred sales inducements, and future policy benefits that would result from the realization of unrealized gains and losses, are included in AOCI. The cost of equity securities is written down to fair value when a decline in value is considered to be other-than-temporary. See the discussion below on realized investment gains and losses for a description of the accounting for impairments. Dividends from these investments are recognized in “Net investment income” when earned.

Commercial mortgage and other loans consist of commercial mortgage loans, agricultural loans and uncollateralized loans. Commercial mortgage and other loans held for investment are generally carried at unpaid principal balance, net of unamortized deferred loan origination fees and expenses and net of an allowance for losses. Commercial mortgage and other loans acquired, including those related to the acquisition of a business, are recorded at fair value when purchased, reflecting any premiums or discounts to unpaid principal balances.

Interest income, as well as prepayment fees and the amortization of the related premiums or discounts, related to commercial mortgage and other loans, are included in “Net investment income.”

Impaired loans include those loans for which it is probable that amounts due will not all be collected according to the contractual terms of the loan agreement. The Company defines “past due” as principal or interest not collected at least 30 days past the scheduled contractual due date. Interest received on loans that are past due, including impaired and non-impaired loans, as well as, loans that were previously modified in a troubled debt restructuring, is either applied against the principal or reported as net investment income based on the Company's assessment as to the collectability of the principal. See Note 3 for additional information about the Company's past due loans.

The Company discontinues accruing interest on loans after the loans become 90 days delinquent as to principal or interest payments, or earlier when the Company has doubts about collectability. When the Company discontinues accruing interest on a loan, any accrued but uncollectible interest on the loan and other loans backed by the same collateral, if any, is charged to interest income in the same period. Generally, a loan is restored to accrual status only after all delinquent interest and principal are brought current and, in the case of loans where the payment of interest has been interrupted for a substantial period, or the loan has been modified, a regular payment performance has been established.

The Company reviews the performance and credit quality of the commercial mortgage and other loan portfolio on an on-going basis. Loans are placed on watch list status based on a predefined set of criteria and are assigned one of three categories. Loans are placed on “early warning” status in cases where, based on the Company's analysis of the loan's collateral, the financial situation of the borrower or tenants or other market factors, it is believed a loss of principal or interest could occur. Loans are classified as “closely monitored” when it is determined that there is a collateral deficiency or other credit events that may lead to a potential loss of principal or interest. Loans “not in good standing” are those loans where the Company has concluded that there is a high probability of loss of principal, such as when the loan is delinquent or in the process of foreclosure. As described below, in determining the allowance for losses, the Company evaluates each loan on the watch list to determine if it is probable that amounts due will not be collected according to the contractual terms of the loan agreement.

Loan-to-value and debt service coverage ratios are measures commonly used to assess the quality of commercial mortgage loans. The loan-to-value ratio compares the amount of the loan to the fair value of the underlying property collateralizing the loan, and is commonly expressed as a percentage. Loan-to-value ratios greater than 100% indicate that the loan amount exceeds the collateral value. A smaller loan-to-value ratio indicates a greater excess of collateral value over the loan amount. The debt service coverage ratio compares a property's net operating income to its debt service payments. Debt service coverage ratios less than 1.0 times indicate that property operations do not generate enough income to cover the loan's current debt payments. A larger debt service coverage ratio indicates a greater excess of net operating income over the debt service payments. The values utilized in calculating these ratios are developed as part of the Company's periodic review of the commercial mortgage loan and agricultural loan portfolio, which includes an internal appraisal of the underlying collateral value. The Company's periodic review also includes a quality re-rating process, whereby the internal quality rating originally assigned at underwriting is updated based on current loan, property and market information using a proprietary quality rating system. The loan-to-value ratio is the most significant of several inputs used to establish the internal credit rating of a loan which in turn drives the allowance for losses. Other key factors considered in determining the internal credit rating include debt service coverage ratios, amortization, loan term, estimated market value growth rate and volatility for the property type and region. See Note 3 for additional information related to the loan-to-value ratios and debt service coverage ratios related to the Company's commercial mortgage and agricultural loan portfolios.

The allowance for losses on commercial mortgage and other loans can increase or decrease from period to period based on the factors noted above. “Realized investment gains (losses), net” includes changes in the allowance for losses. “Realized investment gains (losses), net” also includes gains and losses on sales, certain restructurings, and foreclosures.

When a commercial mortgage or other loan is deemed to be uncollectible, any specific valuation allowance associated with the loan is reversed and a direct write down to the carrying amount of the loan is made. The carrying amount of the loan is not adjusted for subsequent recoveries in value.

In situations where a loan has been restructured in a troubled debt restructuring and the loan has subsequently defaulted, this factor is considered when evaluating the loan for a specific allowance for losses in accordance with the credit review process noted above.

See Note 3 for additional information about commercial mortgage and other loans that have been restructured in a troubled debt restructuring.

Short-term investments primarily consist of highly liquid debt instruments with a maturity of twelve months or less and greater than three months when purchased. These investments are generally carried at fair value and include certain money market investments, short-term debt securities issued by government sponsored entities and other highly liquid debt instruments.

Realized investment gains (losses) are computed using the specific identification method. Realized investment gains and losses are generated from numerous sources, including the sale of fixed maturity securities, equity securities, investments in joint ventures and limited partnerships and other types of investments, as well as adjustments to the cost basis of investments for net other-than-temporary impairments recognized in earnings. Realized investment gains and losses are also generated from prepayment premiums received on private fixed maturity securities, allowance for losses on commercial mortgage and other loans, and fair value changes on embedded derivatives and free-standing derivatives that do not qualify for hedge accounting treatment. See “Derivative Financial Instruments” below for additional information regarding the accounting for derivatives.

The Company's available-for-sale securities with unrealized losses are reviewed quarterly to identify other-than-temporary impairments in value. In evaluating whether a decline in value is other-than-temporary, the Company considers several factors including, but not limited to the following: (1) the extent and the duration of the decline; (2) the reasons for the decline in value (credit event, currency or interest-rate related, including general credit spread widening); and (3) the financial condition of and near-term prospects of the issuer. With regard to available-for-sale equity securities, the Company also considers the ability and intent to hold the investment for a period of time to allow for a recovery of value. When it is determined that a decline in value of an equity security is other-than-temporary, the carrying value of the equity security is reduced to its fair value, with a corresponding charge to earnings.

An other-than-temporary impairment is recognized in earnings for a debt security in an unrealized loss position when the Company either (a) has the intent to sell the debt security or (b) more likely than not will be required to sell the debt security before its anticipated recovery. For all debt securities in unrealized loss positions that do not meet either of these two criteria, the Company analyzes its ability to recover the amortized cost by comparing the net present value of projected future cash flows with the amortized cost of the security. The net present value is calculated by discounting the Company's best estimate of projected future cash flows at the effective interest rate implicit in the debt security prior to impairment. The Company may use the estimated fair value of collateral as a proxy for the net present value if it believes that the security is dependent on the liquidation of collateral for recovery of its investment. If the net present value is less than the amortized cost of the investment an other-than-temporary impairment is recognized.

When an other-than-temporary impairment of a debt security has occurred, the amount of the other-than-temporary impairment recognized in earnings depends on whether the Company intends to sell the security or more likely than not will be required to sell the security before recovery of its amortized cost basis. If the debt security meets either of these two criteria, the other-than-temporary impairment recognized in earnings is equal to the entire difference between the security's amortized cost basis and its fair value at the impairment measurement date. For other-than-temporary impairments of debt securities that do not meet these criteria, the net amount recognized in earnings is equal to the difference between the amortized cost of the debt security and its net present value calculated as described above. Any difference between the fair value and the net present value of the debt security at the impairment measurement date is recorded in “Other comprehensive income (loss)” (“OCI”). Unrealized gains or losses on securities for which an other-than-temporary impairment has been recognized in earnings is tracked as a separate component of AOCI.

For debt securities, the split between the amount of an other-than-temporary impairment recognized in other comprehensive income and the net amount recognized in earnings is driven principally by assumptions regarding the amount and timing of projected cash flows. For mortgage-backed and asset-backed securities, cash flow estimates consider the payment terms of the underlying assets backing a particular security, including interest rate and prepayment assumptions, based on data from widely accepted third-party data sources or internal estimates. In addition to interest rate and prepayment assumptions, cash flow estimates also include other assumptions regarding the underlying collateral including default rates and recoveries, which vary based on the asset type and geographic location, as well as the vintage year of the security. For structured securities, the payment priority within the tranche structure is also considered. For all other debt securities, cash flow estimates are driven by assumptions regarding probability of default and estimates regarding timing and amount of recoveries associated with a default. The Company has developed these estimates using information based on its historical experience as well as using market observable data, such as industry analyst reports and forecasts, sector credit ratings and other data relevant to the collectability of a security, such as the general payment terms of the security and the security's position within the capital structure of the issuer.

The new cost basis of an impaired security is not adjusted for subsequent increases in estimated fair value. In periods subsequent to the recognition of an other-than-temporary impairment, the impaired security is accounted for as if it had been purchased on the measurement date of the impairment. For debt securities, the discount (or reduced premium) based on the new cost basis may be accreted into net investment income in future periods, including increases in cash flow on a prospective basis. In certain cases where there are decreased cash flow expectations, the security is reviewed for further cash flow impairments.

Derivative Financial Instruments

Derivatives are financial instruments whose values are derived from interest rates, foreign exchange rates, financial indices, values of securities or commodities, credit spreads, market volatility, expected returns, and liquidity. Values can also be affected by changes in estimates and assumptions, including those related to counterparty behavior and non-performance risk used in valuation models. Derivative financial instruments generally used by the Company include swaps, futures, forwards and options and may be exchange-traded or contracted in the over-the-counter (“OTC”) market. Derivative positions are carried at fair value, generally by obtaining quoted market prices or through the use of valuation models.

Derivatives are used to manage the interest rate and currency characteristics of assets or liabilities. Additionally, derivatives may be used to seek to reduce exposure to interest rate, credit, foreign currency and equity risks associated with assets held or expected to be purchased or sold, and liabilities incurred or expected to be incurred. As discussed in detail below and in Note 5, all realized and unrealized changes in fair value of derivatives are recorded in current earnings, with the exception of the effective portion of cash flow hedges. Cash flows from derivatives are reported in the operating, investing, or financing activities sections in the Unaudited Interim Statements of Cash Flows based on the nature and purpose of the derivative.

Derivatives are recorded either as assets, within “Other trading account assets, at fair value” or “Other long-term investments,” or as liabilities, within “Other liabilities,” except for embedded derivatives which are recorded with the associated host contract. The Company nets the fair value of all derivative financial instruments with counterparties for which a master netting arrangement has been executed.

The Company designates derivatives as either (1) a hedge of a forecasted transaction or of the variability of cash flows to be received or paid related to a recognized asset or liability (“cash flow” hedge); or (2) a derivative that does not qualify for hedge accounting.

To qualify for hedge accounting treatment, a derivative must be highly effective in mitigating the designated risk of the hedged item. Effectiveness of the hedge is formally assessed at inception and throughout the life of the hedging relationship. Even if a derivative qualifies for hedge accounting treatment, there may be an element of ineffectiveness of the hedge. Under such circumstances, the ineffective portion is recorded in “Realized investment gains (losses), net.”

The Company formally documents at inception all relationships between hedging instruments and hedged items, as well as its risk-management objective and strategy for undertaking various hedge transactions. This process includes linking all derivatives designated as cash flow hedges to specific assets and liabilities on the balance sheet or to specific firm commitments or forecasted transactions.

When a derivative is designated as a cash flow hedge and is determined to be highly effective, changes in its fair value are recorded in AOCI until earnings are affected by the variability of cash flows being hedged (e.g., when periodic settlements on a variable-rate asset or liability are recorded in earnings). At that time, the related portion of deferred gains or losses on the derivative instrument is reclassified and reported in the income statement line item associated with the hedged item.

If it is determined that a derivative no longer qualifies as an effective cash flow hedge or management removes the hedge designation, the derivative will continue to be carried on the balance sheet at its fair value, with changes in fair value recognized currently in “Realized investment gains (losses), net.” The component of AOCI related to discontinued cash flow hedges is reclassified to the income statement line associated with the hedged cash flows consistent with the earnings impact of the original hedged cash flows.

When hedge accounting is discontinued because the hedged item no longer meets the definition of a firm commitment, or because it is probable that the forecasted transaction will not occur by the end of the specified time period, the derivative will continue to be carried on the balance sheet at its fair value, with changes in fair value recognized currently in “Realized investment gains (losses), net.” Any asset or liability that was recorded pursuant to recognition of the firm commitment is removed from the balance sheet and recognized currently in “Realized investment gains (losses), net.” Gains and losses that were in AOCI pursuant to the hedge of a forecasted transaction are recognized immediately in “Realized investment gains (losses), net.”

If a derivative does not qualify for hedge accounting, all changes in its fair value, including net receipts and payments, are included in “Realized investment gains (losses), net” without considering changes in the fair value of the economically associated assets or liabilities.

The Company is a party to financial instruments that contain derivative instruments that are “embedded” in the financial instruments. At inception, the Company assesses whether the economic characteristics of the embedded instrument are clearly and closely related to the economic characteristics of the remaining component of the financial instrument (i.e., the host contract) and whether a separate instrument with the same terms as the embedded instrument would meet the definition of a derivative instrument. When it is determined that (1) the embedded instrument possesses economic characteristics that are not clearly and closely related to the economic characteristics of the host contract, and (2) a separate instrument with the same terms would qualify as a derivative instrument, the embedded instrument qualifies as an embedded derivative that is separated from the host contract, carried at fair value, and changes in its fair value are included in “Realized investment gains (losses), net.” For certain financial instruments that contain an embedded derivative that otherwise would need to be bifurcated and reported at fair value, the Company may elect to classify the entire instrument as a trading account asset and report it within “Trading account assets, at fair value.”

The Company sold variable annuity contracts that include optional living benefit features that may be treated from an accounting perspective as embedded derivatives. The Company has reinsurance agreements to transfer the risk related to certain of these benefit features to an affiliate, Pruco Re. The embedded derivatives related to the living benefit features and the related reinsurance agreements are carried at fair value and included in “Future policy benefits and other policyholder liabilities” and “Reinsurance recoverables,” respectively. Changes in the fair value are determined using valuation models as described in Note 4, and are recorded in “Realized investment gains (losses), net.”

Income taxes

The Company determines its interim tax provision using the annual effective tax rate methodology in accordance with the authoritative guidance. The increase in the income tax expense for the three and nine months ended September 30, 2013 and change in effective tax rate was primarily driven by an increase in pre-tax income for the three and nine months ended September 30, 2013 compared to the three and nine months ended September 30, 2012.

Adoption of New Accounting Pronouncements

In December 2011 and January 2013, the Financial Accounting Standards Board (“FASB”) issued updated guidance regarding the disclosure of recognized derivative instruments (including bifurcated embedded derivatives), repurchase agreements and securities borrowing/lending transactions that are offset in the statement of financial position or are subject to an enforceable master netting arrangement or similar agreement (irrespective of whether they are offset in the statement of financial position). This new guidance requires an entity to disclose information on both a gross and net basis about instruments and transactions within the scope of this guidance. This new guidance is effective for interim or annual reporting periods beginning on or after January 1, 2013, and should be applied retrospectively for all comparative periods presented. The disclosures required by this guidance are included in Note 5.

In February 2013, the FASB issued updated guidance regarding the presentation of comprehensive income. Under the guidance, an entity is required to separately present information about significant items reclassified out of accumulated other comprehensive income by component as well as changes in accumulated other comprehensive income balances by component in either the financial statements or the notes to the financial statements. The guidance does not change the items that are reported in other comprehensive income, does not change when an item of other comprehensive income must be reclassified to net income, and does not amend any existing requirements for reporting net income or other comprehensive income. The guidance is effective for the first interim or annual reporting period beginning after December 15, 2012 and should be applied prospectively. The disclosures required by this guidance are included in Note 3.

In July 2013, the FASB issued new guidance regarding derivatives. The guidance permits the Fed Funds Effective Swap Rate (or Overnight Index Swap Rate) to be used as a U.S. benchmark interest rate for hedge accounting, in addition to the United States Treasury rate and London Inter-Bank Offered Rate (“LIBOR”). The guidance also removes the restriction on using different benchmark rates for similar hedges. The guidance is effective for qualifying new or redesignated hedging relationships entered into on or after July 17, 2013 and should be applied prospectively. Adoption of the guidance did not have a significant effect on the Company's financial position, results of operations, and financial statement disclosures.

Future Adoption of New Accounting Pronouncements

In July 2013, the FASB issued updated guidance regarding the presentation of unrecognized tax benefits when net operating loss carryforwards, similar tax losses, or tax credit carryforwards exist. This new guidance is effective for interim or annual reporting periods that begin after December 15, 2013, and should be applied prospectively, with early application permitted. This guidance is not expected to have a significant effect on the Company's financial position, results of operations, and financial statement disclosures.

- Definition

The entire disclosure for all significant accounting policies of the reporting entity.

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