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Investments and Cash (Tables)
12 Months Ended
Dec. 31, 2023
Investments, Debt and Equity Securities [Abstract]  
Marketable Securities
Investment Portfolio
Carrying Value
As of December 31,
 20232022
 (in millions)
Fixed-maturity securities, available-for-sale (1):
Externally managed (2)$5,372 $5,824 
Loss Mitigation Securities459 506 
Puerto Rico New Recovery Bonds (3) (6)14 358 
Other (4)462 431 
Fixed-maturity securities, trading - Puerto Rico CVIs (3)318 303 
Short-term investments1,661 810 
Other invested assets:
Equity method investments:
Sound Point
429 — 
Alternative investments (5)394 123 
Other10 
Total$9,115 $8,365 
____________________
(1)    7.8% and 7.4% of fixed-maturity securities were rated BIG as of December 31, 2023 and December 31, 2022, respectively, consisting primarily of Loss Mitigation Securities. 1.4% and 5.9% were not rated, as of December 31, 2023 and December 31, 2022, respectively.
(2)    As of December 31, 2023 and December 31, 2022, amounts include $318 million and $305 million, respectively, of CLOs that had been managed internally by AssuredIM under an investment management agreement until such CLOs transitioned to a third-party manager in June 2023.
(3)    These securities are not rated.
(4)     As of December 31, 2023 and December 31, 2022, amounts include $223 million and $232 million, respectively, of investment grade municipal bonds that had been managed by AssuredIM under an investment management agreement until June 2023. In connection with the Sound Point Transaction, the Company retained management of the strategy internally. As of December 31, 2023, the strategy was managed by the U.S. Insurance Subsidiaries for their own accounts. In February 2024, responsibility for the Company’s investment grade municipal securities strategy was transitioned to a third-party asset manager.
(5)     Excludes certain investments in funds that are consolidated and accounted for as CIVs. See Note 8, Financial Guaranty Variable Interest Entities and Consolidated Investment Vehicles.
(6)    In the fourth quarter of 2023, the majority of the New Recovery Bonds were called. See Note 3, Outstanding Exposure.
Fixed Maturity Securities and Short Term Investments by Security Type
Available-for-Sale Fixed-Maturity Securities by Security Type 
As of December 31, 2023
Security TypePercent
of
Total (1)
Amortized
Cost
Allowance for Credit LossesGross
Unrealized
Gains
Gross
Unrealized
Losses
Estimated
Fair
Value
 (dollars in millions)
Obligations of state and political subdivisions41 %$2,733 $(13)$33 $(92)$2,661 
U.S. government and agencies65 — (6)60 
Corporate securities (2)34 2,327 (6)17 (197)2,141 
Mortgage-backed securities (3): 
RMBS428 (21)(68)342 
Commercial mortgage-backed securities (CMBS)157 — — (6)151 
Asset-backed securities:
CLOs456 — (7)450 
Other465 (37)— (26)402 
Non-U.S. government securities115 — — (15)100 
Total available-for-sale fixed-maturity securities100 %$6,746 $(77)$55 $(417)$6,307 
Available-for-Sale Fixed-Maturity Securities by Security Type 
As of December 31, 2022
Security TypePercent
of
Total (1)
Amortized
Cost
Allowance for Credit LossesGross
Unrealized
Gains
Gross
Unrealized
Losses
Estimated
Fair
Value
 (dollars in millions)
Obligations of state and political subdivisions45 %$3,509 $(14)$37 $(138)$3,394 
U.S. government and agencies118 — (8)111 
Corporate securities (2)31 2,387 (6)(299)2,084 
Mortgage-backed securities (3):     
RMBS418 (19)(62)340 
CMBS282 — — (11)271 
Asset-backed securities:
CLOs449 — — (21)428 
Other423 (26)22 (26)393 
Non-U.S. government securities121 — — (23)98 
Total available-for-sale fixed-maturity securities100 %$7,707 $(65)$65 $(588)$7,119 
____________________
(1)Based on amortized cost.
(2)    Includes securities issued by taxable universities and hospitals.
(3)    U.S. government-agency obligations were approximately 42% of mortgage-backed securities as of December 31, 2023 and 30% as of December 31, 2022, based on fair value.

Gross Unrealized Loss by Length of Time
for Available-for-Sale Fixed-Maturity Securities for Which a Credit Loss was Not Recorded
As of December 31, 2023
 Less than 12 months12 months or moreTotal
 Fair
Value
Gross Unrealized
Loss
Fair
Value
Gross Unrealized
Loss
Fair
Value
Gross Unrealized
Loss
 (dollars in millions)
Obligations of state and political subdivisions$641 $(4)$931 $(87)$1,572 $(91)
U.S. government and agencies— — 33 (6)33 (6)
Corporate securities72 (1)1,426 (152)1,498 (153)
Mortgage-backed securities: 
RMBS27 (1)124 (8)151 (9)
CMBS— 148 (6)151 (6)
Asset-backed securities:
CLOs22 (1)379 (6)401 (7)
Other— 26 (1)27 (1)
Non-U.S. government securities— — 95 (15)95 (15)
Total$766 $(7)$3,162 $(281)$3,928 $(288)
Number of securities (1) 274  1,266  1,525 
 
Gross Unrealized Loss by Length of Time
for Available-for-Sale Fixed-Maturity Securities for Which a Credit Loss was Not Recorded
As of December 31, 2022
 Less than 12 months12 months or moreTotal
 Fair
Value
Gross Unrealized
Loss
Fair
Value
Gross Unrealized
Loss
Fair
Value
Gross Unrealized
Loss
 (dollars in millions)
Obligations of state and political subdivisions$1,763 $(79)$163 $(56)$1,926 $(135)
U.S. government and agencies32 — 52 (8)84 (8)
Corporate securities1,276 (95)519 (147)1,795 (242)
Mortgage-backed securities:    
RMBS147 (9)(1)150 (10)
CMBS270 (11)— — 270 (11)
Asset-backed securities:
CLOs171 (7)250 (14)421 (21)
Other27 (2)— — 27 (2)
Non-U.S. government securities65 (10)30 (13)95 (23)
Total$3,751 $(213)$1,017 $(239)$4,768 $(452)
Number of securities (1) 1,340  466  1,776 
___________________
(1)    The number of securities does not add across because lots consisting of the same securities have been purchased at different times and appear in both categories above (i.e., less than 12 months and 12 months or more). If a security appears in both categories, it is counted only once in the total column.
Distribution of Fixed Maturity Securities by Contractual Maturity
Distribution of Available-for-Sale Fixed-Maturity Securities by Contractual Maturity
As of December 31, 2023 
 Amortized
Cost
Estimated
Fair Value
 (in millions)
Due within one year$331 $325 
Due after one year through five years1,427 1,368 
Due after five years through 10 years1,741 1,675 
Due after 10 years2,662 2,446 
Mortgage-backed securities:  
RMBS428 342 
CMBS157 151 
Total$6,746 $6,307 
Net Investment Income
Income from Investments
 Year Ended December 31,
 202320222021
 (in millions)
Investment income:
Fixed-maturity securities, available-for-sale:
Externally managed (1)$207 $201 $212 
Loss Mitigation Securities55 31 38 
Puerto Rico, New Recovery Bonds 12 — 
Other (2)20 19 24 
Short-term investments73 15 — 
Other invested assets
Investment income370 274 275 
Investment expenses(5)(5)(6)
Net investment income$365 $269 $269 
Fair value gains (losses) on trading securities (3)$74 $(34)$— 
Equity in earnings (losses) of investees
Sound Point (5)
$$— $— 
Funds (4)15 30 
Other(41)64 
Equity in earnings (losses) of investees
$28 $(39)$94 
____________________
(1)    Includes income on the portion of the CLO portfolio that was managed by AssuredIM prior to July 1, 2023.
(2)    Includes income on the portion of the municipal bond portfolio that was managed by AssuredIM prior to July 1, 2023.
(3)    Fair value gains on trading securities pertaining to securities still held as of December 31, 2023 were $31 million for 2023. Fair value losses on trading securities pertaining to securities still held as of December 31, 2022 were $29 million for 2022.
(4)     Sound Point and AHP funds, and, prior to July 1, 2023, AssuredIM funds.
(5)    Beginning in the fourth quarter of 2023, equity in earnings (losses) includes the Company’s share of the earnings of Sound Point, which is reported on a one-quarter lag.
Summary of Financial Information for Equity Method Investments The table below presents summarized financial information for equity method investments that meet, in aggregate, the requirements for reporting summarized disclosures. Such requirements were met in 2021, and the information for 2023 and 2022 is presented for comparative purposes.
Aggregate Equity Method Investments’
Summarized Balance Sheet Data
As of December, 31
20232022
(in millions)
Investments$1,735 $444 
Assets of consolidated funds and CLOs1,449 — 
Other assets792 253 
Total assets$3,976 $697 
Liabilities of consolidated funds and CLOs$1,342 $— 
Other liabilities365 76 
Total liabilities$1,707 $76 
Equity attributable to investees$2,234 $621 
Noncontrolling interest35 — 
Total equity$2,269 $621 

Aggregate Equity Method Investments’
Summarized Statement of Operations Data
Year Ended December 31,
202320222021
(in millions)
Fee income$57 $15 $29 
Net gains (losses) on investments and investment income129 (365)456 
Income of consolidated funds and CLOs37 — — 
Other income39 35 63 
Total revenues$262 $(315)$548 
Expenses of consolidated funds and CLOs$25 $— $— 
Other expenses108 49 64 
Total expenses$133 $49 $64 
Net income (loss)$129 $(364)$484 
Net income (loss) attributable to investees$127 $(364)$484 
Net Realized Investment Gains (Losses) The table below presents the components of net realized investment gains (losses).
Net Realized Investment Gains (Losses) 
 Year Ended December 31,
 202320222021
 (in millions)
Gross realized gains on sales of available-for-sale securities (1)$21 $$20 
Gross realized losses on sales of available-for-sale securities (2)(19)(45)(5)
Net foreign currency gains (losses)(1)(4)
Change in the allowance for credit losses and intent to sell (3)(14)(21)(7)
Other net realized gains (losses)(1)11 
Net realized investment gains (losses)$(14)$(56)$15 
____________________
(1)2023 and 2022 related primarily to sales of New Recovery Bonds received as part of the 2022 Puerto Rico Resolutions.
(2)2022 related primarily to sales of New Recovery Bonds received as part of the 2022 Puerto Rico Resolutions.
(3)Change in allowance for credit losses for all periods was primarily related to Loss Mitigation Securities.
Debt Securities, Available-for-Sale, Allowance for Credit Loss
The following table presents the roll forward of allowance for the credit losses on available-for-sale fixed-maturity securities.
 
Roll Forward of Allowance for Credit Losses
for Available-for-Sale Fixed-Maturity Securities
 Year Ended December 31,
 202320222021
 (in millions)
Balance, beginning of period$65 $42 $78 
Additions for securities for which credit losses were not previously recognized— 
Additions for purchases of securities accounted for as purchased financial assets with credit deterioration— — 
Additions (reductions) for securities for which credit losses were previously recognized12 14 
Reductions for securities sold and other settlements— — (42)
Balance, end of period$77 $65 $42