Investments, Debt and Equity Securities (Policies)	9 Months Ended
Sep. 30, 2020
Investments, Debt and Equity Securities [Abstract]
Investments	Debt Securities Accounting policy. Debt securities (including bonds, mortgage and other asset-backed securities and preferred stocks redeemable by the investor) are classified as available for sale and are carried at fair value with changes in fair value recorded either in Accumulated other comprehensive income (loss) within Shareholders’ equity or in credit loss expense based on fluctuations in the allowance for credit losses, as further discussed below. Net unrealized appreciation on debt securities supporting the Company’s run-off settlement annuity business is reported in Non-current insurance and contractholder liabilities rather than Accumulated other comprehensive income (loss). When the Company intends to sell or determines that it is more likely than not to be required to sell an impaired debt security, the excess of amortized cost over fair value is directly written down with a charge to Realized investment gains and losses. As of January 1, 2020, the Company adopted ASU 2016-13 that included certain targeted improvements to the accounting for available-for-sale debt securities. The new guidance resulted in certain policy changes related to the process used by the Company to review declines in fair value from a security’s amortized cost basis to determine whether a credit loss exists. For example, the length of time that a debt security has been impaired is no longer a criterion for this review. In addition, under this new guidance, the Company recognizes an allowance for credit loss with a corresponding charge to credit loss expense, presented in Realized investment gains and losses in the Company’s income statement. Prior to this new guidance, the Company recorded a direct write-down of the instrument’s amortized cost basis. The allowance for credit loss represents the excess of amortized cost over the greater of its fair value or the net present value of the debt security's projected future cash flows (based on qualitative and quantitative factors, including the probability of default, and the estimated timing and amount of recovery). Each period, the allowance for credit loss is adjusted through credit loss expense. The Company elected the expedient to not measure an allowance for credit losses for accrued interest receivables. Consistent with prior practice, when interest payments are delinquent based on contractual terms or when certain terms (interest rate or maturity date) of the investment have been restructured, accrued interest, reported in Other current assets, is written off through a charge to Net investment income, and interest income is recognized on a cash basis. Debt securities are classified as either Current or Long-term investments based on their contractual maturities. Review of declines in fair value. Management reviews impaired debt securities to determine whether a credit loss allowance is needed based on criteria that include: •severity of decline; •financial health and specific prospects of the issuer; and •changes in the regulatory, economic or general market environment of the issuer’s industry or geographic region. Equity Securities Equity securities with a readily determinable fair value consist primarily of mutual funds that invest in fixed income debt securities. Equity securities without a readily determinable fair value consist of private equity investments and are carried at cost minus impairment, if any, plus or minus changes resulting from observable price changes. Commercial Mortgage LoansAccounting policy. Commercial mortgage loans are carried at unpaid principal balances. Beginning January 1, 2020 with the adoption of ASU 2016-13, unpaid principal balances are presented net of an allowance for expected credit losses. Changes in the allowance for expected credit losses are recognized as credit loss expense and presented in Realized investment gains and losses in the Company’s income statement. Each period, the Company establishes (or adjusts) its allowance for expected credit losses for commercial mortgage loans. The allowance for expected credit losses is based on a credit risk category that is assigned to each loan at origination using key credit quality indicators, including debt service coverage and loan-to-value ratios. Credit risk categories are updated as key credit quality indicators change. An expected loss rate, assigned based on the credit risk category, is applied to each loan's unpaid principal balance to develop an aggregate allowance for expected credit losses. Prior to adoption, impaired commercial mortgage loans were written down to the lower of unpaid principal or fair value of the underlying collateral when it became probable that the Company would not collect all amounts due under its promissory note. Commercial mortgage loans are considered impaired and written off against the allowance when it is probable that the Company will not collect all amounts due per the terms of the promissory note. The Company elected the expedient to not measure an allowance for credit losses for accrued interest receivables. Consistent with our prior practice, accrued interest, reported in other current assets, is written off through a charge to net investment income; interest income on impaired loans is only recognized when a payment is received. In the event of a foreclosure, the allowance for credit losses is based on the excess of the carrying value of the mortgage loan over the fair value of its underlying collateral. Mortgage loans held by the Company are made exclusively to commercial borrowers and are diversified by property type, location and borrower. Loans are generally issued at fixed rates of interest and are secured by high quality, primarily completed and substantially leased operating properties. Commercial mortgage loans are classified as either current or long-term investments based on their contractual maturities. Credit quality. The Company regularly evaluates and monitors credit risk, beginning with the initial underwriting of a mortgage loan and continuing throughout the investment holding period. Mortgage origination professionals employ an internal credit quality rating system designed to evaluate the relative risk of the transaction at origination that is then updated each year as part of the annual portfolio loan review. The Company evaluates and monitors credit quality on a consistent and ongoing basis. Quality ratings are based on our evaluation of a number of key inputs related to the loan, including real estate market-related factors such as rental rates and vacancies, and property-specific inputs such as growth rate assumptions and lease rollover statistics. However, the two most significant contributors to the credit quality rating are the debt service coverage and loan-to-value ratios. The debt service coverage ratio measures the amount of property cash flow available to meet annual interest and principal payments on debt, with a ratio below 1.0 indicating that there is not enough cash flow to cover the required loan payments. The loan-to-value ratio, commonly expressed as a percentage, compares the amount of the loan to the fair value of the underlying property collateralizing the loan. The Company’s annual in-depth review of its commercial mortgage loan investments is the primary mechanism for identifying emerging risks in the portfolio. The Company’s investment professionals completed the annual in-depth review in the second quarter of 2020 that included an analysis of each underlying property’s most recent annual financial statements, rent rolls, operating plans, budgets, a physical inspection of the property and other pertinent factors. Based on historical results, current leases, lease expirations and rental conditions in each market, the Company estimated the current year and future stabilized property income and fair value for each loan. The average loan to value increased slightly from last year and remains strong. The portfolio's average debt service coverage ratio decreased slightly at September 30, 2020 compared with December 31, 2019 but remains at a high level.The Company re-evaluates a loan’s credit quality between annual reviews if new property information is received or an event such as delinquency or a borrower’s request for restructure causes management to believe that the Company’s estimate of financial performance, fair value or the risk profile of the underlying property has been impacted. Other Long-Term Investments Other long-term investments include investments in unconsolidated entities, including certain limited partnerships and limited liability companies holding real estate, securities or loans. These investments are carried at cost plus the Company's ownership percentage of reporting income or loss, based on the financial statements of the underlying investments that are generally reported at fair value. Income or loss from these investments is reported on a one quarter lag due to the timing of when financial information is received from the general partner or manager of the investments. Realized Investment Gains and LossesAccounting policy. Realized investment gains and losses are based on specifically identified assets and result from sales, investment asset write-downs, change in the fair value of certain derivatives and equity securities, and changes in valuation reserves on commercial mortgage loans. Commencing January 1, 2020, realized gains and losses also include credit loss expense resulting from the impact of changes in the allowances for credit losses on debt securities and commercial mortgage loan investments under ASU 2016-13.Derivative Financial Instruments The Company uses derivative financial instruments to manage the characteristics of investment assets (such as duration, yield, currency and liquidity) to meet the varying demands of the related insurance and contract holder liabilities. The Company also uses derivative financial instruments to hedge the risk of changes in the net assets of certain of its foreign subsidiaries due to changes in foreign currency exchange rates. The Company has written and purchased GMIB reinsurance contracts in its run-off reinsurance business that are accounted for as freestanding derivatives as discussed in Note 10. Derivatives in the Company’s separate accounts are excluded from the following discussion because associated gains and losses generally accrue directly to separate account policyholders. Derivative instruments used by the Company typically include foreign currency swap contracts and foreign currency forward contracts. Foreign currency swap contracts periodically exchange cash flows between two currencies for principal and interest. Foreign currency forward contracts require the Company to purchase a foreign currency in exchange for the functional currency of its operating unit at a future date. The Company manages the credit risk of these derivative instruments by diversifying its portfolio among approved dealers of high credit quality and through routine monitoring of credit risk exposures. Certain of the Company’s over-the-counter derivative instruments require either the Company or the counterparty to post collateral or demand immediate payment depending on the amount of the net liability position of the derivative instrument and predefined financial strength or credit rating thresholds. The Company’s derivative financial instruments are presented as follows: •Fair value hedges of the foreign exchange-related changes in fair values of certain foreign-denominated bonds: Swap fair values are reported in Long-term investments or Other non-current liabilities. Changes in fair values attributable to foreign exchange risk of the swap contracts and the hedged bonds are reported in Realized investment gains and losses. The portion of the swap contracts’ changes in fair value excluded from the assessment of hedge effectiveness is recorded in Other comprehensive income and recognized in Net investment income as swap coupon payments are accrued, offsetting the foreign-denominated coupons received on the designated bonds. Net cash flows are reported in Operating activities, while exchanges of notional principal amounts are reported in Investing activities. •Net investment hedges of certain foreign subsidiaries that conduct their business principally in currencies other than the U.S. dollar: The fair values of the foreign currency swap and forward contracts are reported in Other assets or Other liabilities. The changes in fair values of these instruments are reported in Other comprehensive income, specifically in translation of foreign currencies. The portion of the change in fair values relating to foreign exchange spot rates will be recognized in earnings upon deconsolidation of the hedged foreign subsidiaries. The remaining changes in fair value of these instruments are excluded from our effectiveness assessment and recognized in interest expense when coupon payments are accrued or ratably over the term of the instrument. The notional value of hedging instruments matches the hedged amount of subsidiary net assets. Cash flows relating to these contracts are reported in Investing activities. •Economic hedges for derivatives not designated as accounting hedges: Fair values of forward contracts are reported in current Investments or Accrued expenses and other liabilities. The changes in fair values are reported in Realized investment gains and losses. Cash flows relating to these contracts are reported in Investing activities.

Accounting policy. Debt securities (including bonds, mortgage and other asset-backed securities and preferred stocks redeemable by the investor) are classified as available for sale and are carried at fair value with changes in fair value recorded either in Accumulated other comprehensive income (loss) within Shareholders’ equity or in credit loss expense based on fluctuations in the allowance for credit losses, as further discussed below. Net unrealized appreciation on debt securities supporting the Company’s run-off settlement annuity business is reported in Non-current insurance and contractholder liabilities rather than Accumulated other comprehensive income (loss). When the Company intends to sell or determines that it is more likely than not to be required to sell an impaired debt security, the excess of amortized cost over fair value is directly written down with a charge to Realized investment gains and losses.

As of January 1, 2020, the Company adopted ASU 2016-13 that included certain targeted improvements to the accounting for available-for-sale debt securities. The new guidance resulted in certain policy changes related to the process used by the Company to review declines in fair value from a security’s amortized cost basis to determine whether a credit loss exists. For example, the length of time that a debt security has been impaired is no longer a criterion for this review. In addition, under this new guidance, the Company recognizes an allowance for credit loss with a corresponding charge to credit loss expense, presented in Realized investment gains and losses in the Company’s income statement. Prior to this new guidance, the Company recorded a direct write-down of the instrument’s amortized cost basis. The allowance for credit loss represents the excess of amortized cost over the greater of its fair value or the net present value of the debt security's projected future cash flows (based on

qualitative and quantitative factors, including the probability of default, and the estimated timing and amount of recovery). Each period, the allowance for credit loss is adjusted through credit loss expense.

The Company elected the expedient to not measure an allowance for credit losses for accrued interest receivables. Consistent with prior practice, when interest payments are delinquent based on contractual terms or when certain terms (interest rate or maturity date) of the investment have been restructured, accrued interest, reported in Other current assets, is written off through a charge to Net investment income, and interest income is recognized on a cash basis.

Commercial mortgage loans are considered impaired and written off against the allowance when it is probable that the Company will not collect all amounts due per the terms of the promissory note. The Company elected the expedient to not measure an allowance for credit losses for accrued interest receivables. Consistent with our prior practice, accrued interest, reported in other current assets, is written off through a charge to net investment income; interest income on impaired loans is only recognized when a payment is received.

Mortgage loans held by the Company are made exclusively to commercial borrowers and are diversified by property type, location and borrower. Loans are generally issued at fixed rates of interest and are secured by high quality, primarily completed and substantially leased operating properties. Commercial mortgage loans are classified as either current or long-term investments based on their contractual maturities.

Credit quality. The Company regularly evaluates and monitors credit risk, beginning with the initial underwriting of a mortgage loan and continuing throughout the investment holding period. Mortgage origination professionals employ an internal credit quality rating system designed to evaluate the relative risk of the transaction at origination that is then updated each year as part of the annual portfolio loan review. The Company evaluates and monitors credit quality on a consistent and ongoing basis.

Quality ratings are based on our evaluation of a number of key inputs related to the loan, including real estate market-related factors such as rental rates and vacancies, and property-specific inputs such as growth rate assumptions and lease rollover statistics. However, the two most significant contributors to the credit quality rating are the debt service coverage and loan-to-value ratios. The debt service coverage ratio measures the amount of property cash flow available to meet annual interest and principal payments on debt, with a ratio below 1.0 indicating that there is not enough cash flow to cover the required loan payments. The loan-to-value ratio, commonly expressed as a percentage, compares the amount of the loan to the fair value of the underlying property collateralizing the loan.

Other long-term investments include investments in unconsolidated entities, including certain limited partnerships and limited liability companies holding real estate, securities or loans. These investments are carried at cost plus the Company's ownership percentage of reporting income or loss, based on the financial statements of the underlying investments that are generally reported at fair value. Income or loss from these investments is reported on a one quarter lag due to the timing of when financial information is received from the general partner or manager of the investments.

The Company uses derivative financial instruments to manage the characteristics of investment assets (such as duration, yield, currency and liquidity) to meet the varying demands of the related insurance and contract holder liabilities. The Company also uses derivative financial instruments to hedge the risk of changes in the net assets of certain of its foreign subsidiaries due to changes in foreign currency exchange rates. The Company has written and purchased GMIB reinsurance contracts in its run-off reinsurance business that are accounted for as freestanding derivatives as discussed in Note 10. Derivatives in the Company’s separate accounts are excluded from the following discussion because associated gains and losses generally accrue directly to separate account policyholders.

Derivative instruments used by the Company typically include foreign currency swap contracts and foreign currency forward contracts. Foreign currency swap contracts periodically exchange cash flows between two currencies for principal and interest. Foreign currency forward contracts require the Company to purchase a foreign currency in exchange for the functional currency of its operating unit at a future date.

•Fair value hedges of the foreign exchange-related changes in fair values of certain foreign-denominated bonds: Swap fair values are reported in Long-term investments or Other non-current liabilities. Changes in fair values attributable to foreign exchange risk of the swap contracts and the hedged bonds are reported in Realized investment gains and losses. The portion of the swap contracts’ changes in fair value excluded from the assessment of hedge effectiveness is recorded in Other comprehensive income and recognized in Net investment income as swap coupon payments are accrued, offsetting the foreign-denominated coupons received on the designated bonds. Net cash flows are reported in Operating activities, while exchanges of notional principal amounts are reported in Investing activities.

•Net investment hedges of certain foreign subsidiaries that conduct their business principally in currencies other than the U.S. dollar: The fair values of the foreign currency swap and forward contracts are reported in Other assets or Other liabilities. The changes in fair values of these instruments are reported in Other comprehensive income, specifically in translation of foreign currencies. The portion of the change in fair values relating to foreign exchange spot rates will be recognized in earnings upon deconsolidation of the hedged foreign subsidiaries. The remaining changes in fair value of these instruments are excluded from our effectiveness assessment and recognized in interest expense when coupon payments are accrued or

ratably over the term of the instrument. The notional value of hedging instruments matches the hedged amount of subsidiary net assets. Cash flows relating to these contracts are reported in Investing activities.

•Economic hedges for derivatives not designated as accounting hedges: Fair values of forward contracts are reported in current Investments or Accrued expenses and other liabilities. The changes in fair values are reported in Realized investment gains and losses. Cash flows relating to these contracts are reported in Investing activities.