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Investments | 12 Months Ended
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Dec. 31, 2021
Investments [Abstract] |
Investments | Investments The significant components of Net investment income are presented in the following table.
Years ended December 31 |  |  |  |  |
(In millions) | 2021 |  | 2020 |  | 2019
Fixed maturity securities | $ | 1,707 |  |  | $ | 1,728 |  |  | $ | 1,817 |
Equity securities | 83 |  |  | 65 |  |  | 85 |
Limited partnership investments | 362 |  |  | 121 |  |  | 180 |
Mortgage loans | 61 |  |  | 57 |  |  | 51 |
Short term investments | 1 |  |  | 9 |  |  | 34 |
Trading portfolio | 9 |  |  | 18 |  |  | 9 |
Other | — |  |  | 1 |  |  | 5 |
Gross investment income | 2,223 |  |  | 1,999 |  |  | 2,181 |
Investment expense | (64) |  |  | (64) |  |  | (63) |
Net investment income | $ | 2,159 |  |  | $ | 1,935 |  |  | $ | 2,118 |
For the years ended December 31, 2021 and 2020, $28 million and $34 million of Net i nvestment income was recognized due to the change in fair value of common stock still held as of December 31, 2021 and 2020. As of December 31, 2021 and 2020, the Company held less than $1 million of non-income producing fixed maturity securities. As of December 31, 2021 and 2020, the Company held $7 million and $0 of non-income producing mortgage loans. As of December 31, 2021 and 2020, no investments in a single issuer exceeded 10% of stockholders' equity, other than investments in securities issued by the U.S. Treasury and obligations of government-sponsored enterprises. Net investment gains (losses) are presented in the following table.
Years ended December 31 |  |  |  |  |
(In millions) | 2021 |  | 2020 |  | 2019
Net investment gains (losses): |  |  |  |  |
Fixed maturity securities: |  |  |  |  |
Gross gains | $ | 186 |  |  | $ | 220 |  |  | $ | 125 |
Gross losses | (90) |  |  | (220) |  |  | (131) |
Net investment gains (losses) on fixed maturity securities | 96 |  |  | — |  |  | (6) |
Equity securities | 4 |  |  | (3) |  |  | 66 |
Derivatives | 6 |  |  | (10) |  |  | (11) |
Mortgage loans | 10 |  |  | (21) |  |  | — |
Short term investments and other | 4 |  |  | (20) |  |  | (20) |
Net investment gains (losses) | $ | 120 |  |  | $ | (54) |  |  | $ | 29 |
For the ye ars ended December 31, 2021 and 2020, $2 million of gains and $3 million of losses were recognized in Net investment gains (losses) due to the change in fair value of non-redeemable preferred stock stil l held as of December 31, 2021 and 2020, respectively. Short term investments and other included a $20 million loss for the year ended December 31, 2020 related to the redemption of the Company's $400 million senior notes due August 2021 and a $21 million loss for the year ended December 31, 2019 related to the redemption of the Company's $500 million senior notes due August 2020. The following tables present the activity related to the allowance on available-for-sale securities with credit impairments and purchased credit-deteriorated (PCD) assets. Accrued interest receivable on available-for-sale fixed maturity securities totaled $369 million and $371 million as of December 31, 2021 and 2020 and is excluded from the estimate of expected credit losses and the amortized cost basis in the table included within this Note.
(In millions) | Corporate and other bonds |  | Asset-backed |  | Total
Allowance for credit losses: |  |  |  |  |
Balance as of January 1, 2021 | $ | 23 |  |  | $ | 17 |  |  | $ | 40 |
Additions to the allowance for credit losses: |  |  |  |  |
Securities for which credit losses were not previously recorded | 14 |  |  | — |  |  | 14 |
Available-for-sale securities accounted for as PCD assets | 5 |  |  | 6 |  |  | 11 |
Reductions to the allowance for credit losses: |  |  |  |  |
Securities sold during the period (realized) | 7 |  |  | 17 |  |  | 24 |
Intent to sell or more likely than not will be required to sell the security before recovery of its amortized cost basis | — |  |  | — |  |  | — |
Write-offs charged against the allowance | 16 |  |  | — |  |  | 16 |
Recoveries of amounts previously written off | — |  |  | — |  |  | — |
Additional increases or (decreases) to the allowance for credit losses on securities that had an allowance recorded in a previous period | (8) |  |  | 1 |  |  | (7) |
Balance as of December 31, 2021 | $ | 11 |  |  | $ | 7 |  |  | $ | 18 |
(In millions) | Corporate and other bonds |  | Asset-backed |  | Total
Allowance for credit losses: |  |  |  |  |
Balance as of January 1, 2020 | $ | — |  |  | $ | — |  |  | $ | — |
Additions to the allowance for credit losses: |  |  |  |  |
Impact of adopting ASC 326 | 6 |  |  | — |  |  | 6 |
Securities for which credit losses were not previously recorded | 67 |  |  | 12 |  |  | 79 |
Available-for-sale securities accounted for as PCD assets | 5 |  |  | — |  |  | 5 |
Reductions to the allowance for credit losses: |  |  |  |  |
Securities sold during the period (realized) | 22 |  |  | — |  |  | 22 |
Intent to sell or more likely than not will be required to sell the security before recovery of its amortized cost basis | 1 |  |  | — |  |  | 1 |
Write-offs charged against the allowance | — |  |  | — |  |  | — |
Recoveries of amounts previously written off | — |  |  | — |  |  | — |
Additional increases or (decreases) to the allowance for credit losses on securities that had an allowance recorded in a previous period | (32) |  |  | 5 |  |  | (27) |
Balance as of December 31, 2020 | $ | 23 |  |  | $ | 17 |  |  | $ | 40 |
The components of available-for-sale impairment losses recognized in earnings by asset type are presented in the following table. The table includes losses on securities with an intention to sell and changes in the allowance for credit losses on securities since acquisition date.
Years ended December 31 |  |  |  |  |
(In millions) | 2021 |  | 2020 |  | 2019
Fixed maturity securities available-for-sale: |  |  |  |  |
Corporate and other bonds | $ | 11 |  |  | $ | 87 |  |  | $ | 33 |
Asset-backed | 20 |  |  | 24 |  |  | 11 |
Impairment (gains) losses recognized in earnings | $ | 31 |  |  | $ | 111 |  |  | $ | 44 |
For the ye ars ended December 31, 2021 and 2020, the Company also recognized $10 million of gains and $21 million of losses related to mortgage loans primarily due to changes in expected credit losses. The net change in unrealized gains on investments, which consists solely of the change in unrealized gains on fixed maturity securities, was $(1,272) million, $1,637 million and $2,620 million for the years ended December 31, 2021, 2020 and 2019. The following tables present a summary of fixed maturity securities.
December 31, 2021 | Cost or Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Allowance for Credit Losses |  | Estimated Fair Value
(In millions) |  |  |  |
Fixed maturity securities available-for-sale: |  |  |  |  |  |  |  |  |
Corporate and other bonds | $ | 21,444 |  |  | $ | 2,755 |  |  | $ | 56 |  |  | $ | 11 |  |  | $ | 24,132 |
States, municipalities and political subdivisions | 10,358 |  |  | 1,599 |  |  | 14 |  |  | — |  |  | 11,943 |
Asset-backed: |  |  |  |  |  |  |  |  |
Residential mortgage-backed | 2,893 |  |  | 71 |  |  | 8 |  |  | — |  |  | 2,956 |
Commercial mortgage-backed | 1,987 |  |  | 63 |  |  | 19 |  |  | — |  |  | 2,031 |
Other asset-backed | 2,561 |  |  | 54 |  |  | 10 |  |  | 7 |  |  | 2,598 |
Total asset-backed | 7,441 |  |  | 188 |  |  | 37 |  |  | 7 |  |  | 7,585 |
U.S. Treasury and obligations of government-sponsored enterprises | 132 |  |  | 1 |  |  | 3 |  |  | — |  |  | 130 |
Foreign government | 570 |  |  | 15 |  |  | 2 |  |  | — |  |  | 583 |
Total fixed maturity securities available-for-sale | 39,945 |  |  | 4,558 |  |  | 112 |  |  | 18 |  |  | 44,373 |
Total fixed maturity securities trading | 7 |  |  | — |  |  | — |  |  | — |  |  | 7 |
Total fixed maturity securities | $ | 39,952 |  |  | $ | 4,558 |  |  | $ | 112 |  |  | $ | 18 |  |  | $ | 44,380 |
December 31, 2020 | Cost or Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Allowance for Credit Losses |  | Estimated Fair Value
(In millions) |  |  |  |
Fixed maturity securities available-for-sale: |  |  |  |  |  |  |  |  |
Corporate and other bonds | $ | 20,792 |  |  | $ | 3,578 |  |  | $ | 22 |  |  | $ | 23 |  |  | $ | 24,325 |
States, municipalities and political subdivisions | 9,729 |  |  | 1,863 |  |  | — |  |  | — |  |  | 11,592 |
Asset-backed: |  |  |  |  |  |  |  |  |
Residential mortgage-backed | 3,442 |  |  | 146 |  |  | 1 |  |  | — |  |  | 3,587 |
Commercial mortgage-backed | 1,933 |  |  | 93 |  |  | 42 |  |  | 17 |  |  | 1,967 |
Other asset-backed | 2,179 |  |  | 81 |  |  | 9 |  |  | — |  |  | 2,251 |
Total asset-backed | 7,554 |  |  | 320 |  |  | 52 |  |  | 17 |  |  | 7,805 |
U.S. Treasury and obligations of government-sponsored enterprises | 339 |  |  | 2 |  |  | 3 |  |  | — |  |  | 338 |
Foreign government | 512 |  |  | 32 |  |  | — |  |  | — |  |  | 544 |
Total fixed maturity securities available-for-sale | 38,926 |  |  | 5,795 |  |  | 77 |  |  | 40 |  |  | 44,604 |
Total fixed maturity securities trading | 27 |  |  | — |  |  | — |  |  | — |  |  | 27 |
Total fixed maturity securities | $ | 38,953 |  |  | $ | 5,795 |  |  | $ | 77 |  |  | $ | 40 |  |  | $ | 44,631 |
The following tables present the estimated fair value and gross unrealized losses of fixed maturity securities in a gross unrealized loss position for which an allowance for credit loss has not been recorded, by the length of time in which the securities have continuously been in that position.
| Less than 12 Months |  | 12 Months or Longer |  | Total
December 31, 2021 | Estimated Fair Value |  | Gross Unrealized Losses |  | Estimated Fair Value |  | Gross Unrealized Losses |  | Estimated Fair Value |  | Gross Unrealized Losses
(In millions) |  |  |  |  |
Fixed maturity securities available-for-sale: |  |  |  |  |  |  |  |  |  |  |
Corporate and other bonds | $ | 2,389 |  |  | $ | 48 |  |  | $ | 136 |  |  | $ | 8 |  |  | $ | 2,525 |  |  | $ | 56 |
States, municipalities and political subdivisions | 730 |  |  | 14 |  |  | — |  |  | — |  |  | 730 |  |  | 14 |
Asset-backed: |  |  |  |  |  |  |  |  |  |  |
Residential mortgage-backed | 1,043 |  |  | 8 |  |  | — |  |  | — |  |  | 1,043 |  |  | 8 |
Commercial mortgage-backed | 527 |  |  | 7 |  |  | 167 |  |  | 12 |  |  | 694 |  |  | 19 |
Other asset-backed | 840 |  |  | 10 |  |  | 62 |  |  | — |  |  | 902 |  |  | 10 |
Total asset-backed | 2,410 |  |  | 25 |  |  | 229 |  |  | 12 |  |  | 2,639 |  |  | 37 |
U.S. Treasury and obligations of government-sponsored enterprises | 69 |  |  | 3 |  |  | 5 |  |  | — |  |  | 74 |  |  | 3 |
Foreign government | 97 |  |  | 2 |  |  | — |  |  | — |  |  | 97 |  |  | 2 |
Total | $ | 5,695 |  |  | $ | 92 |  |  | $ | 370 |  |  | $ | 20 |  |  | $ | 6,065 |  |  | $ | 112 |
| Less than 12 Months |  | 12 Months or Longer |  | Total
December 31, 2020 | Estimated Fair Value |  | Gross Unrealized Losses |  | Estimated Fair Value |  | Gross Unrealized Losses |  | Estimated Fair Value |  | Gross Unrealized Losses
(In millions) |  |  |  |  |
Fixed maturity securities available-for-sale: |  |  |  |  |  |  |  |  |  |  |
Corporate and other bonds | $ | 609 |  |  | $ | 21 |  |  | $ | 12 |  |  | $ | 1 |  |  | $ | 621 |  |  | $ | 22 |
States, municipalities and political subdivisions | 33 |  |  | — |  |  | — |  |  | — |  |  | 33 |  |  | — |
Asset-backed: |  |  |  |  |  |  |  |  |  |  |
Residential mortgage-backed | 71 |  |  | 1 |  |  | 11 |  |  | — |  |  | 82 |  |  | 1 |
Commercial mortgage-backed | 533 |  |  | 40 |  |  | 28 |  |  | 2 |  |  | 561 |  |  | 42 |
Other asset-backed | 344 |  |  | 9 |  |  | 13 |  |  | — |  |  | 357 |  |  | 9 |
Total asset-backed | 948 |  |  | 50 |  |  | 52 |  |  | 2 |  |  | 1,000 |  |  | 52 |
U.S. Treasury and obligations of government-sponsored enterprises | 63 |  |  | 3 |  |  | — |  |  | — |  |  | 63 |  |  | 3 |
Foreign government | 13 |  |  | — |  |  | — |  |  | — |  |  | 13 |  |  | — |
Total | $ | 1,666 |  |  | $ | 74 |  |  | $ | 64 |  |  | $ | 3 |  |  | $ | 1,730 |  |  | $ | 77 |
Based on current facts and circumstances, the Company believes the unrealized losses presented in the December 31, 2021 securities in a gross unrealized loss position table above are not indicative of the ultimate collectibility of the current amortized cost of the securities, but rather are attributable to changes in interest rates, credit spreads and other factors. The Company has no current intent to sell securities with unrealized losses, nor is it more likely than not that it will be required to sell prior to recovery of amortized cost; accordingly, the Company has determined that there are no additional impairment losses to be recorded as of December 31, 2021. Contractual Maturity The following table presents available-for-sale fixed maturity securities by contractual maturity.
December 31 | 2021 |  | 2020
(In millions) | Cost or Amortized Cost |  | Estimated Fair Value |  | Cost or Amortized Cost |  | Estimated Fair Value
Due in one year or less | $ | 1,603 |  |  | $ | 1,624 |  |  | $ | 1,456 |  |  | $ | 1,458 |
Due after one year through five years | 10,637 |  |  | 11,229 |  |  | 12,304 |  |  | 13,098 |
Due after five years through ten years | 13,294 |  |  | 14,338 |  |  | 12,319 |  |  | 13,878 |
Due after ten years | 14,411 |  |  | 17,182 |  |  | 12,847 |  |  | 16,170 |
Total | $ | 39,945 |  |  | $ | 44,373 |  |  | $ | 38,926 |  |  | $ | 44,604 |
Actual maturities may differ from contractual maturities because certain securities may be called or prepaid. Securities not due at a single date are allocated based on weighted average life. Limited Partnerships The carrying value of limited partnerships as of December 31, 2021 and 2020 was $1,859 million and $1,619 million, which includes net undistributed earnings of $266 million and $235 million. Limited partnerships comprising 32% of the total carrying value are reported on a current basis through December 31, 2021 with no reporting lag, 6% are reported on a one month lag and the remainder are reported on more than a one month lag. The number of limited partnerships held and the strategies employed provide diversification to the limited partnership portfolio and the overall invested asset portfolio. Limited partnerships comprising 68% and 49% of the carrying value as of December 31, 2021 and 2020 were invested in private debt and equity. Limited partnerships comprising 32% and 51% of the carrying value as of December 31, 2021 and 2020 employ hedge fund strategies. Private debt and equity funds cover a broad range of investment strategies including buyout, co-investment, private credit, growth capital, distressed investing and real estate. Hedge fund strategies include both long and short positions in fixed income, equity and derivative instruments. The ten largest limited partnership positions held totaled $665 million and $775 million as of December 31, 2021 and 2020. Based on the most recent information available regarding the Company’s percentage ownership of the individual limited partnerships, the carrying value reflected on the Consolidated Balance Sheets represents approximately 1% and 2% of the aggregate partnership equity as of December 31, 2021 and 2020, and the related income reflected on the Consolidated Statements of Operations represents approximately 2%, 2% and 2% of the changes in aggregate partnership equity for the years ended December 31, 2021, 2020 and 2019. There are risks inherent in limited partnership investments which may result in losses due to short-selling, derivatives or other speculative investment practices. The use of leverage increases volatility generated by the underlying investment strategies. The Company’s private debt, private equity and other non-hedge fund limited partnership investments generally do not permit voluntary withdrawals. The Company’s hedge fund limited partnership investments contain withdrawal provisions that generally limit liquidity for a period of thirty days up to one year or longer. Typically, hedge fund withdrawals require advance written notice of up to 90 days. Derivative Financial Instruments The Company may use derivatives in the normal course of business, primarily in an attempt to reduce its exposure to market risk (principally interest rate risk and foreign currency risk) stemming from various assets and liabilities. The Company's principal objective under such strategies is to achieve the desired reduction in economic risk, even if the position does not receive hedge accounting treatment. The Company may enter into interest rate swaps, futures and forward commitments to purchase securities to manage interest rate risk. The Company may use foreign currency forward contracts to manage foreign currency risk. Credit exposure associated with non-performance by the counterparties to derivative instruments is generally limited to the uncollateralized fair value of the asset related to the instruments recognized on the Consolidated Balance Sheets. The Company generally requires that all over-the-counter derivative contracts be governed by an International Swaps and Derivatives Association Master Agreement, and exchanges collateral under the terms of these agreements with its derivative investment counterparties depending on the amount of the exposure and the credit rating of the counterparty. Gross estimated fair values of derivative positions are presented in Other invested assets and Other liabilities on the Consolidated Balance Sheets. The Company does not offset derivative positions against the fair value of collateral provided or positions subject to netting arrangements. There would be no significant difference in the balance included in such accounts if the estimated fair values were presented net as of December 31, 2021 and 2020. There was no cash collateral provided by the Company or cash collateral received from counterparties as of December 31, 2021 or 2020. The Company holds an embedded derivative on a funds withheld liability with a notional value of $270 million and $190 million and a fair value of $(12) million and $(19) million as of December 31, 2021 and 2020. The embedded derivative on the funds withheld liability is accounted for separately and reported with the funds withheld liability in Other liabilities on the Consolidated Balance Sheets. Investment Commitments As part of its overall investment strategy, the Company invests in various assets which require future purchase, sale or funding commitments. These investments are recorded once funded, and the related commitments may include future capital calls from various third-party limited partnerships, signed and accepted mortgage loan applications, and obligations related to private placement securities. As of December 31, 2021, the Company had commitments to purchase or fund approximately $1,230 million and sell approximately $90 million under the terms of these investments. Investments on Deposit Securities with carrying values of approximately $3.0 billion were deposited by the Company’s insurance subsidiaries under requirements of regulatory authorities and others as of December 31, 2021 and 2020. Cash and securities with carrying values of approximately $1.2 billion and $1.1 billion were deposited with financial institutions in trust accounts or as collateral for letters of credit to secure obligations with various third parties as of December 31, 2021 and 2020. Mortgage Loans The following table presents the amortized cost basis of mortgage loans for each credit quality indicator by year of origination.
December 31, 2021 | Mortgage Loans Amortized Cost Basis by Origination Year (1)
(In millions) | 2021 |  | 2020 |  | 2019 |  | 2018 |  | 2017 |  | Prior |  | Total
DSCR ≥1.6x |  |  |  |  |  |  |  |  |  |  |  |  |
LTV less than 55% | $ | 2 |  |  | $ | 75 |  |  | $ | 6 |  |  | $ | 38 |  |  | $ | 99 |  |  | $ | 181 |  |  | $ | 401 |
LTV 55% to 65% | 5 |  |  | 38 |  | 15 |  | 17 |  | — |  |  | 24 |  |  | 99
LTV greater than 65% | 17 |  |  | — |  |  | 8 |  | — |  |  | — |  |  | — |  |  | 25
DSCR 1.2x - 1.6x |  |  |  |  |  |  |  |  |  |  |  |  |
LTV less than 55% | 14 |  |  | 14 |  |  | 95 |  |  | — |  |  | 5 |  |  | 42 |  |  | 170
LTV 55% to 65% | 36 |  |  | — |  |  | — |  |  | 24 |  |  | 10 |  |  | — |  |  | 70
LTV greater than 65% | — |  |  | 24 |  |  | — |  |  | — |  |  | 8 |  |  | — |  |  | 32
DSCR ≤1.2 |  |  |  |  |  |  |  |  |  |  |  |  |
LTV less than 55% | — |  |  | — |  |  | 35 |  |  | — |  |  | 30 |  |  | — |  |  | 65
LTV 55% to 65% | — |  |  | — |  |  | 28 |  |  | — |  |  | — |  |  | — |  |  | 28
LTV greater than 65% | 21 |  |  | 9 |  |  | 62 |  |  | — |  |  | — |  |  | 7 |  |  | 99
Total | $ | 95 |  |  | $ | 160 |  |  | $ | 249 |  |  | $ | 79 |  |  | $ | 152 |  |  | $ | 254 |  |  | $ | 989 |
(1) The values in the table above reflect DSCR on a standardized amortization period and LTV based on the most recent appraised values trended forward using changes in a commercial real estate price index. As of December 31, 2021, accrued interest receivable on mortgage loans totaled $3 million and is excluded from the amortized cost basis disclosed in the table above and the estimate of expected credit losses.

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- Definition The entire disclosure for investment. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 321 -URI http://asc.fasb.org/topic&trid=75115024 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -URI http://asc.fasb.org/topic&trid=2196928 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 325 -URI http://asc.fasb.org/topic&trid=2197064 Reference 4: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -URI http://asc.fasb.org/topic&trid=2196965 + Details
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