Assured Guaranty (AGO) 10-Q 8 Nov 23 2023 Q3 Quarterly report Financial data

Cover Page

Cover Page - shares	9 Months Ended
	Sep. 30, 2023	Nov. 06, 2023
Entity Information [Line Items]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Sep. 30, 2023
Document Transition Report	false
Entity File Number	001-32141
Entity Registrant Name	ASSURED GUARANTY LTD.
Entity Incorporation, State or Country Code	D0
Entity Tax Identification Number	98-0429991
Entity Address, Address Line One	30 Woodbourne Avenue
Entity Address, City or Town	Hamilton
Entity Address, Postal Zip Code	HM 08
Entity Address, Country	BM
City Area Code	441
Local Phone Number	279-5700
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		57,256,573
Entity Central Index Key	0001273813
Amendment Flag	false
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2023
Document Fiscal Period Focus	Q3
New York Stock Exchange | Common Shares
Entity Information [Line Items]
Title of 12(b) Security	Common Shares
Trading Symbol	AGO
Security Exchange Name	NYSE
New York Stock Exchange | Assured Guaranty US Holdings Inc. 6.125% Senior Notes Due 2028
Entity Information [Line Items]
Title of 12(b) Security	Assured Guaranty US Holdings Inc. 6.125% Senior Notes due 2028 (and the related guarantee of Registrant)
Trading Symbol	AGO/28
Security Exchange Name	NYSE
New York Stock Exchange | Assured Guaranty US Holdings Inc. 3.150% Senior Notes due 2031 (and the related guarantee of Registrant)
Entity Information [Line Items]
Title of 12(b) Security	Assured Guaranty US Holdings Inc. 3.150% Senior Notes due 2031 (and the related guarantee of Registrant)
Trading Symbol	AGO/31
Security Exchange Name	NYSE
New York Stock Exchange | Assured Guaranty US Holdings Inc. 3.600% Senior Notes due 2051 (and the related guarantee of Registrant)
Entity Information [Line Items]
Title of 12(b) Security	Assured Guaranty US Holdings Inc. 3.600% Senior Notes due 2051 (and the related guarantee of Registrant)
Trading Symbol	AGO/51
Security Exchange Name	NYSE

Condensed Consolidated Balance

Condensed Consolidated Balance Sheets (Unaudited) - USD ($) $ in Millions	Sep. 30, 2023	Dec. 31, 2022
Investments:
Fixed-maturity securities, available-for-sale, at fair value, net of allowance for credit loss of $86 and $65 (amortized cost of $6,971 and $7,707)	$ 6,267	$ 7,119
Fixed-maturity securities, trading, at fair value	350	303
Short-term investments, at fair value	1,426	810
Other invested assets	765	133
Total investments	8,808	8,365
Cash	108	107
Premiums receivable, net of commissions payable	1,376	1,298
Deferred acquisition costs	158	147
Salvage and subrogation recoverable	282	257
Financial guaranty variable interest entities’ assets (includes $326 and $413, at fair value)	327	416
Assets of consolidated investment vehicles (includes $318 and $5,363, at fair value)	330	5,493
Goodwill and other intangible assets	6	163
Other assets (includes $112 and $148, at fair value)	549	597
Total assets	11,944	16,843
Liabilities
Unearned premium reserve	3,600	3,620
Loss and loss adjustment expense reserve	361	296
Long-term debt	1,693	1,675
Credit derivative liabilities, at fair value	50	163
Financial guaranty variable interest entities’ liabilities, at fair value (with recourse $531 and $702, without recourse $11 and $13)	542	715
Liabilities of consolidated investment vehicles (includes $0 and $4,431, at fair value)	4	4,625
Other liabilities	393	457
Total liabilities	6,643	11,551
Commitments and contingencies (Note 13)
Shareholders’ equity
Common shares ($0.01 par value, 500,000,000 shares authorized; 57,819,732 and 59,013,040 shares issued and outstanding)	1	1
Retained earnings	5,815	5,577
Accumulated other comprehensive income (loss), net of tax of $(97) and $(84)	(565)	(515)
Deferred equity compensation	1	1
Total shareholders’ equity attributable to Assured Guaranty Ltd.	5,252	5,064
Nonredeemable noncontrolling interests (Note 8)	49	228
Total shareholders’ equity	5,301	5,292
Total liabilities and shareholders’ equity	$ 11,944	$ 16,843

Condensed Consolidated Balanc_2

Condensed Consolidated Balance Sheets (Unaudited) (Parenthetical) - USD ($) $ in Millions	Sep. 30, 2023	Dec. 31, 2022
Statement of Financial Position [Abstract]
Allowance for credit loss	$ 86	$ 65
Amortized cost	6,971	7,707
Financial guaranty variable interest entities' assets	326	413
Assets of consolidated investment vehicles, fair value disclosure	318	5,363
Other assets, fair value disclosure	112	148
Financial guaranty variable interest entities' liabilities, with recourse	531	702
Financial guaranty variable interest entities' liabilities, without recourse	11	13
Liabilities of consolidated investment vehicles, fair value disclosure	$ 0	$ 4,431
Common stock par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized (in shares)	500,000,000	500,000,000
Common stock, shares issued (in shares)	57,819,732	59,013,040
Common stock, shares outstanding (in shares)	57,819,732	59,013,040
Accumulated other comprehensive income, tax provision	$ (97)	$ (84)

Condensed Consolidated Statemen

Condensed Consolidated Statements of Operations (Unaudited) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Revenues
Net earned premiums	$ 95	$ 89	$ 261	$ 385
Net investment income	100	67	270	191
Asset management fees	0	16	53	71
Net realized investment gains (losses)	(9)	(14)	(20)	(39)
Fair value gains (losses) on credit derivatives	9	(48)	115	(42)
Fair value gains (losses) on committed capital securities	(20)	1	(35)	12
Fair value gains (losses) on financial guaranty variable interest entities	6	11	(2)	27
Fair value gains (losses) on consolidated investment vehicles	(4)	8	60	25
Foreign exchange gains (losses) on remeasurement	(39)	(80)	9	(181)
Fair value gains (losses) on trading securities	4	(8)	42	(30)
Gain on sale of asset management subsidiaries	255	0	255	0
Other income (loss)	6	(1)	38	12
Total revenues	403	41	1,046	431
Expenses
Loss and loss adjustment expenses (benefit)	100	(75)	159	(29)
Interest expense	24	20	67	60
Amortization of deferred acquisition costs	4	4	10	11
Employee compensation and benefit expenses	47	57	199	189
Other operating expenses	44	37	170	120
Total expenses	219	43	605	351
Income (loss) before income taxes and equity in earnings (losses) of investees	184	(2)	441	80
Equity in Earnings (Losses) of Investees	18	(20)	25	(31)
Income (loss) before income taxes	202	(22)	466	49
Less: Provision (benefit) for income taxes	43	(27)	84	(6)
Net income (loss)	159	5	382	55
Less: Noncontrolling interests	2	(6)	19	25
Net income (loss) attributable to Assured Guaranty Ltd.	$ 157	$ 11	$ 363	$ 30
Earnings per share:
Basic (in dollars per share)	$ 2.65	$ 0.18	$ 6.11	$ 0.47
Diluted (in dollars per share)	$ 2.60	$ 0.18	$ 5.99	$ 0.46

Condensed Consolidated Statem_2

Condensed Consolidated Statements of Comprehensive Income (Loss) (Unaudited) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ 159	$ 5	$ 382	$ 55
Change in net unrealized gains (losses) on:
Investments with no credit impairment, net of tax provision (benefit) of $(23), $(39), $(15) and $(139)	(113)	(277)	(54)	(857)
Investments with credit impairment, net of tax provision (benefit) of $(2), $1, $(4) and $(18)	(8)	2	(13)	(81)
Change in net unrealized gains (losses) on investments	(121)	(275)	(67)	(938)
Change in instrument-specific credit risk on financial guaranty variable interest entities’ liabilities with recourse, net of tax	10	(3)	11	(1)
Other, net of tax	4	(4)	6	(13)
Other comprehensive income (loss)	(107)	(282)	(50)	(952)
Comprehensive income (loss)	52	(277)	332	(897)
Less: Comprehensive income (loss) attributable to noncontrolling interests	2	(6)	19	25
Comprehensive income (loss) attributable to Assured Guaranty Ltd.	$ 50	$ (271)	$ 313	$ (922)

Condensed Consolidated Statem_3

Condensed Consolidated Statements of Comprehensive Income (Loss) (Unaudited) (Parenthetical) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Statement of Comprehensive Income [Abstract]
Investments with no credit impairment, tax	$ (23)	$ (39)	$ (15)	$ (139)
Investments with credit impairment, tax	$ (2)	$ 1	$ (4)	$ (18)

Condensed Consolidated Statem_4

Condensed Consolidated Statement of Shareholders' Equity (Unaudited) - USD ($) $ in Millions	Total	Total	Common Shares	Retained Earnings	Accumulated Other Comprehensive Income (Loss)	Deferred Equity Compensation	Nonredeemable Noncontrolling Interests
Beginning balance (in shares) at Dec. 31, 2021			67,518,424
Beginning balance at Dec. 31, 2021	$ 6,478	$ 6,292	$ 1	$ 5,990	$ 300	$ 1	$ 186
Increase (Decrease) in Shareholders' Equity
Net income	56	30		30			26
Dividends	(49)	(49)		(49)
Common share repurchases (in shares)			(7,134,565)
Common shares repurchases	(403)	(403)		(403)
Shared based compensation (in shares)			335,572
Share-based compensation	11	11		11
Contributions	63						63
Distributions	(51)						(51)
Other comprehensive loss	(952)	(952)			(952)
Ending balance (in shares) at Sep. 30, 2022			60,719,431
Ending balance at Sep. 30, 2022	5,153	4,929	$ 1	5,579	(652)	1	224
Beginning balance (in shares) at Jun. 30, 2022			62,475,739
Beginning balance at Jun. 30, 2022	5,547	5,304	$ 1	5,672	(370)	1	243
Increase (Decrease) in Shareholders' Equity
Net income	5	11		11			(6)
Dividends	(16)	(16)		(16)
Common share repurchases (in shares)			(1,790,395)
Common shares repurchases	(97)	(97)		(97)
Shared based compensation (in shares)			34,087
Share-based compensation	9	9		9
Contributions	23						23
Distributions	(36)						(36)
Other comprehensive loss	(282)	(282)			(282)
Ending balance (in shares) at Sep. 30, 2022			60,719,431
Ending balance at Sep. 30, 2022	5,153	4,929	$ 1	5,579	(652)	1	224
Beginning balance (in shares) at Dec. 31, 2022			59,013,040
Beginning balance at Dec. 31, 2022	5,292	5,064	$ 1	5,577	(515)	1	228
Increase (Decrease) in Shareholders' Equity
Net income	382	363		363			19
Dividends	(51)	(51)		(51)
Common share repurchases (in shares)			(1,556,213)
Common shares repurchases	(90)	(90)		(90)
Shared based compensation (in shares)			362,905
Share-based compensation	16	16		16
Reclassification to liabilities	(16)						(16)
Contributions	20						20
Distributions	(70)						(70)
Other comprehensive loss	(50)	(50)			(50)
Deconsolidation of investment vehicles	(132)						(132)
Ending balance (in shares) at Sep. 30, 2023			57,819,732
Ending balance at Sep. 30, 2023	5,301	5,252	$ 1	5,815	(565)	1	49
Beginning balance (in shares) at Jun. 30, 2023			58,850,144
Beginning balance at Jun. 30, 2023	5,455	5,276	$ 1	5,732	(458)	1	179
Increase (Decrease) in Shareholders' Equity
Net income	159	157		157			2
Dividends	(16)	(16)		(16)
Common share repurchases (in shares)			(1,065,902)
Common shares repurchases	(64)	(64)		(64)
Shared based compensation (in shares)			35,490
Share-based compensation	6	6		6
Other comprehensive loss	(107)	(107)			(107)
Deconsolidation of investment vehicles	(132)						(132)
Ending balance (in shares) at Sep. 30, 2023			57,819,732
Ending balance at Sep. 30, 2023	$ 5,301	$ 5,252	$ 1	$ 5,815	$ (565)	$ 1	$ 49

Condensed Consolidated Statem_5

Condensed Consolidated Statement of Shareholders' Equity (Unaudited) (Parenthetical) - $ / shares	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Statement of Stockholders' Equity [Abstract]
Dividends per share (in dollars per share)	$ 0.28	$ 0.25	$ 0.84	$ 0.75

Condensed Consolidated Statem_6

Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Millions	3 Months Ended			9 Months Ended		12 Months Ended
	Sep. 30, 2023	Dec. 31, 2022	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022	Dec. 31, 2022
Statement of Cash Flows [Abstract]
Net cash flows provided by (used in) operating activities				$ 258	$ (1,848)
Fixed-maturity securities, available-for-sale:
Purchases				(458)	(279)
Sales	$ 73		$ 207	767	560
Maturities and paydowns				528	585
Short-term investments with original maturities of over three months:
Purchases				(16)	(42)
Sales				4	0
Maturities and paydowns				35	23
Net sales (purchases) of short-term investments with original maturities of less than three months				(638)	64
Sales of fixed-maturity securities, trading				0	121
Paydowns of financial guaranty variable interest entities’ assets				88	74
Purchases of other invested assets				(128)	(11)
Sales and return of capital of other invested assets				16	35
Sale of asset management subsidiaries, net of cash				(14)	0
Other				(1)	(2)
Net cash flows provided by (used in) investing activities				183	1,128
Cash flows from financing activities:
Dividends paid				(51)	(49)
Repurchases of common shares				(90)	(400)
Net paydowns of financial guaranty variable interest entities’ liabilities				(141)	(92)
Issuance of long-term debt, net of issuance costs				345	0
Redemption of debt				(330)	0
Other				(15)	(6)
Cash flows from consolidated investment vehicles:
Proceeds from issuance of collateralized loan obligations				0	1,372
Repayment of collateralized loan obligations				(1)	(373)
Proceeds from issuance of warehouse financing debt				0	882
Repayment of warehouse financing debt				(166)	(758)
Borrowing (payment) under credit facilities				(4)	46
Contributions from noncontrolling interests to consolidated investment vehicles				0	52
Distributions to noncontrolling interests from consolidated investment vehicles				(80)	(19)
Net cash flows provided by (used in) financing activities				(533)	655
Effect of foreign exchange rate changes				0	(6)
Increase (decrease) in cash and cash equivalents and restricted cash				(92)	(71)
Cash and cash equivalents and restricted cash at beginning of period		$ 271		207	342	$ 342
Cash and cash equivalents and restricted cash at end of period	115	207	271	115	271	207
Supplemental cash flow information
Income taxes paid (received)				3	97
Interest paid on long-term debt				55	47
Supplemental disclosure of non-cash activities:
Fixed-maturity securities, available-for-sale, received as salvage				1	610
Fixed-maturity securities, available-for-sale, ceded to a reinsurer				0	27
Fixed-maturity securities, trading, received as salvage				0	550
Fixed-maturity securities, trading, ceded to a reinsurer				0	6
Debt securities of financial guaranty variable interest entities received as salvage				0	54
Contributions from noncontrolling interests				20	32
Distributions to noncontrolling interests				27	53
Assets acquired				444	0
Assets transferred				241	0
Liabilities transferred				66	0
Reconciliation of cash and cash equivalents and restricted cash to the condensed consolidated balance sheets:
Cash	108	107	131	108	131	107
Restricted cash (included in other assets)	0		1	0	1
Cash and cash equivalents of consolidated investment vehicles (See Note 8)	7		139	7	139
Cash and cash equivalents and restricted cash at end of period	$ 115	$ 207	$ 271	$ 115	$ 271	$ 207

Business and Basis of Presentat

Business and Basis of Presentation	9 Months Ended
	Sep. 30, 2023
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Business and Basis of Presentation	Business and Basis of Presentation Business Assured Guaranty Ltd. (AGL and, together with its subsidiaries, Assured Guaranty or the Company) is a Bermuda-based holding company that provides, through its wholly-owned operating subsidiaries, credit protection products to the United States (U.S.) and non-U.S. public finance (including infrastructure) and structured finance markets. Assured Guaranty also participates in the asset management business, as described below. Insurance Through its insurance subsidiaries, the Company applies its credit underwriting judgment, risk management skills and capital markets experience primarily to offer financial guaranty insurance that protects holders of debt instruments and other monetary obligations from defaults in scheduled payments. If an obligor defaults on a scheduled payment due on an obligation, including a scheduled principal or interest payment (collectively, debt service), the Company is required under its unconditional and irrevocable financial guaranty to pay the amount of the shortfall to the holder of the obligation. The Company markets its financial guaranty insurance directly to issuers and underwriters of public finance and structured finance securities as well as to investors in such obligations. The Company guarantees obligations issued principally in the U.S. and the United Kingdom (U.K.) and also guarantees obligations issued in other countries and regions, including Western Europe. The Company also provides specialty insurance and reinsurance on transactions with risk profiles similar to those of its structured finance exposure`s written in financial guaranty form. Asset Management Until July 1, 2023, the Company served as an investment advisor to collateralized loan obligations (CLOs) and opportunity funds, as well as certain legacy hedge and opportunity funds subject to an orderly wind-down, through Assured Investment Management LLC (AssuredIM LLC) and its investment management affiliates (together with AssuredIM LLC, AssuredIM). Beginning July 1, 2023, the Company participates in the asset management business through its ownership interest in Sound Point Capital Management, LP (Sound Point), as described below. On July 1, 2023, Assured Guaranty contributed to Sound Point most of its asset management business, other than that conducted by Assured Healthcare Partners LLC (AssuredIM Contributed Business), as contemplated by the transaction agreement entered into with Sound Point on April 5, 2023 (Transaction Agreement). In addition, in accordance with the terms of a letter agreement (Letter Agreement), effective July 1, 2023 Assured Guaranty Municipal Corp. and Assured Guaranty Corp. (collectively, the U.S. Insurance Subsidiaries) (i) engaged Sound Point as their sole alternative credit manager and (ii) transitioned to Sound Point the management of certain existing alternative investments and related commitments. The Letter Agreement also provides that, in the first two years of Sound Point’s engagement, the U.S. Insurance Subsidiaries would, subject to regulatory approval, make new investments in funds, other vehicles and separately managed accounts managed by Sound Point which, when aggregated with the alternative investments and commitments transitioned from AssuredIM, will total $1 billion. See Note 7, Investments. Assured Guaranty received, subject to certain potential post-closing adjustments, common interests in Sound Point representing a 30% participation percentage in Sound Point, and certain other interests in related Sound Point entities (the transactions contemplated under the Transaction Agreement and the Letter Agreement, the Sound Point Transaction). In July 2023, Assured Guaranty sold all of its equity interests in Assured Healthcare Partners LLC (AHP), which manages healthcare funds, to an entity owned and controlled by the managing partner of AHP (AHP Transaction). In connection with the AHP Transaction, the Company agreed to remain a strategic investor in certain AHP investment vehicles, is retaining certain carried interest in AHP entities and received other consideration. Upon closing of the Sound Point Transaction and the AHP Transaction the Company deconsolidated most of the corresponding AssuredIM entities (which had previously been classified as held-for-sale) and reported an investment in Sound Point that is accounted for under the equity method. In connection with the Sound Point Transaction and AHP Transaction, the Company reevaluated its consolidation conclusion for each consolidated investment vehicle (CIV) and deconsolidated all but three CIVs. See Note 8, Financial Guaranty Variable Interest Entities and Consolidated Investment Vehicles. The following table presents the calculation of the gain associated with the Sound Point Transaction and AHP Transaction. Gain on Sound Point Transaction and AHP Transaction (in millions) Fair value of investment in Sound Point $ 419 Fair value of other consideration 25 Total consideration 444 Less net asset carrying value of transferred AssuredIM subsidiaries (1) 189 Gain on sale of asset management subsidiaries (2) $ 255 ____________________ (1) Consists primarily of goodwill and intangible assets of $155 million. (2) Consists of a $248 million gain on the Sound Point Transaction, and a $7 million gain on the AHP Transaction, which were both reported in the corporate division. The Company’s interest in Sound Point is reported in other invested assets on the consolidated balance sheet. On the date of acquisition, the Company’s cost basis of its investment in Sound Point is the fair value of the Company’s ownership in Sound Point, and certain other interests in related Sound Point entities (collectively, Sound Point entities). The acquisition date cost basis includes a basis difference, which is the excess of the fair value of the Company’s ownership interest in Sound Point entities of $419 million, over the Company’s proportionate share of the equity of the Sound Point entities. The basis difference must be allocated between identifiable assets and liabilities. The carrying value on the date of acquisition is periodically adjusted for the Company’s share in the comprehensive income or loss of Sound Point entities (on a one-quarter lag), distributions, contributions and the amortization of definite-lived intangible assets. As of the filing of this report, the Company has not finalized the calculation of the basis difference or the allocation of such basis difference. The equity method investment in Sound Point is subject to a periodic other-than-temporary-impairment (OTTI) analysis. The Company recognized expenses of $14 million and $46 million during the three-month period ended September 30, 2023 (third quarter 2023) and the nine-month period ended September 30, 2023 (nine months 2023), respectively, associated with the Sound Point Transaction and AHP Transaction. Assets and Liabilities Held For Sale The Company designated certain assets and liabilities supporting the Insurance segment as held for sale in the first quarter of 2023 and expects the sale of such assets to be completed in 2024. A disposal group is measured at the lower of carrying amount or fair value less any costs associated with the transaction. The Company assessed the disposal group for impairment and determined no impairment existed as of September 30, 2023. Upon classification of the disposal group as held for sale, the Company ceased depreciating held for sale fixed assets and amortizing held for sale intangibles. Assets held for sale were $28 million and liabilities held for sale were $2 million as of September 30, 2023 and were reported in “other assets” and “other liabilities,” respectively. Basis of Presentation The unaudited interim condensed consolidated financial statements have been prepared in conformity with accounting principles generally accepted in the United States of America (GAAP). In management’s opinion, all material adjustments necessary for a fair statement of the financial condition, results of operations and cash flows of the Company, including its consolidated variable interest entities (VIEs), are reflected in the periods presented and are of a normal, recurring nature. The preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities as of the date of the financial statements and the reported amounts of revenues and expenses during the reporting period. Actual results could differ from those estimates. These unaudited interim condensed consolidated financial statements are as of September 30, 2023 and cover third quarter 2023, the three-month period ended September 30, 2022 (third quarter 2022), nine months 2023 and the nine-month period ended September 30, 2022 (nine months 2022). Certain financial information that is normally included in annual financial statements prepared in accordance with GAAP, but is not required for interim reporting purposes, has been condensed or omitted. The year-end condensed consolidated balance sheet data was derived from audited financial statements, but does not include all disclosures required by GAAP. Certain prior year balances have been reclassified to conform to the current period’s presentation. The unaudited interim condensed consolidated financial statements include the accounts of AGL, its direct and indirect subsidiaries, and its consolidated financial guaranty VIEs (FG VIEs) and CIVs. See Note 8, Financial Guaranty Variable Interest Entities and Consolidated Investment Vehicles. Intercompany accounts and transactions between and among all consolidated entities have been eliminated. These unaudited interim condensed consolidated financial statements should be read in conjunction with the consolidated financial statements included in the Annual Report on Form 10-K for the year ended December 31, 2022 filed with the U.S. Securities and Exchange Commission (SEC). The Company’s principal insurance subsidiaries are: • Assured Guaranty Municipal Corp. (AGM), domiciled in New York; • Assured Guaranty Corp. (AGC), domiciled in Maryland; • Assured Guaranty UK Limited (AGUK), organized in the U.K.; • Assured Guaranty (Europe) SA (AGE), organized in France; • Assured Guaranty Re Ltd. (AG Re), domiciled in Bermuda; and • Assured Guaranty Re Overseas Ltd. (AGRO), domiciled in Bermuda. The U.S. Insurance Subsidiaries jointly own an investment subsidiary, AG Asset Strategies LLC (AGAS), which invests in funds managed by Sound Point, AHP, and, prior to July 1, 2023, AssuredIM (Sound Point and AHP funds, some of which were formerly known as AssuredIM funds). AGL directly or indirectly owns several holding companies, two of which - Assured Guaranty US Holdings Inc. (AGUS) and Assured Guaranty Municipal Holdings Inc. (AGMH and, together with AGUS, the U.S. Holding Companies) - have public debt outstanding. See Note 11, Long-Term Debt. Recent Accounting Standards Adopted Targeted Improvements to the Accounting for Long-Duration Contracts In August 2018, the Financial Accounting Standards Board (FASB) issued Accounting Standards Update (ASU) 2018-12, Financial Services - Insurance (Topic 944): Targeted Improvements to the Accounting for Long-Duration Contracts . The Company’s adoption of this ASU on January 1, 2023 did not have any effect on the Company’s consolidated financial statements.

Segment Information

Segment Information	9 Months Ended
	Sep. 30, 2023
Segment Reporting [Abstract]
Segment Information	Segment Information The Company reports its results of operations in two segments: Insurance and Asset Management, separate from its Corporate division and the effects of consolidating FG VIEs and CIVs, which is consistent with the manner in which the Company’s chief operating decision maker (CODM) reviews the business to assess performance and allocate resources. The Insurance segment primarily consists of: (i) the Company’s insurance subsidiaries; and (ii) AGAS. Prior to July 1, 2023, the Asset Management segment consisted of AssuredIM, which provided asset management services to third-party investors as well as to the U.S. Insurance Subsidiaries and AGAS. Beginning in July 2023, the Company participates in the asset management business through its investment in Sound Point as described in Note 1, Business and Basis of Presentation. Beginning in third quarter 2023, the Asset Management segment primarily includes the results of the Company’s equity method investment in Sound Point entities, which are reported on a one-quarter lag. The Corporate division primarily consists of interest expense on the debt of the U.S. Holding Companies and any losses on extinguishment or repurchases of their debt, as well as any gains and losses and other operating expenses attributed to the corporate activities of AGL and the U.S. Holding Companies, including the gain associated with the Sound Point Transaction and the AHP Transaction. The Other category primarily includes the effect of consolidating FG VIEs and CIVs, intersegment eliminations and the reclassification of reimbursable fund expenses. See Note 8, Financial Guaranty Variable Interest Entities and Consolidated Investment Vehicles. The segment results differ from the consolidated financial statements in certain respects. The Insurance segment includes: (i) premiums and losses from the financial guaranty insurance policies issued by the U.S. Insurance Subsidiaries which guarantee the FG VIEs’ debt; and (ii) AGAS’ share of earnings from investments in Sound Point and AHP funds in “equity in earnings (losses) of investees.” Under GAAP, (i) FG VIEs are consolidated by the U.S. Insurance Subsidiaries and the premiums and losses/recoveries associated with the financial guaranty policies associated with the FG VIEs’ debt are eliminated (the reconciliation tables below present the FG VIEs and related eliminations in “other”) and (ii) CIVs are consolidated by either AGUS or AGAS (in the reconciliation tables below, the CIVs and related eliminations of the Insurance segment’s “equity in earnings (losses) of investees” associated with AGAS’ ownership interest in CIVs are presented in “other”). Until July 1, 2023, under GAAP, reimbursable fund expenses were shown as a component of asset management fees and included in total revenues, whereas in the Asset Management segment in the tables below these expenses were netted in “segment expenses.” The Company analyzes the operating performance of each segment using “segment adjusted operating income (loss).” Results for each segment include specifically identifiable expenses as well as intersegment expense allocations, as applicable, based on time studies and other cost allocation methodologies based on headcount or other metrics. Segment adjusted operating income is defined as “net income (loss) attributable to AGL,” adjusted for the following items, which primarily affect the Insurance segment and corporate division: • Elimination of realized gains (losses) on the Company’s investments, except for gains and losses on securities classified as trading. • Elimination of non-credit impairment-related unrealized fair value gains (losses) on credit derivatives that are recognized in net income, which is the amount of unrealized fair value gains (losses) in excess of the present value of the expected estimated economic credit losses, and non-economic payments. • Elimination of fair value gains (losses) on the Company’s committed capital securities (CCS) that are recognized in net income. • Elimination of foreign exchange gains (losses) on remeasurement of net premium receivables and loss and loss adjustment expense (LAE) reserves that are recognized in net income. • Elimination of the tax effects related to the above adjustments, which are determined by applying the statutory tax rate in each of the jurisdictions that generate these adjustments. The Company does not report assets by reportable segment as the CODM does not assess performance and allocate resources based on assets. The following table presents information for the Company’s operating segments. Intersegment revenues include transactions between and among the segments, the corporate division and other. Segment Information Third Quarter 2023 2022 Insurance Asset Management Insurance Asset Management (in millions) Third-party revenues $ 206 $ — $ 145 $ 13 Intersegment revenues 2 — 2 8 Segment revenues 208 — 147 21 Segment expenses 165 — (16) 24 Segment equity in earnings (losses) of investees 25 — (11) — Less: Segment provision (benefit) for income taxes 9 — (7) — Segment adjusted operating income (loss) $ 59 $ — $ 159 $ (3) Nine Months 2023 2022 Insurance Asset Management Insurance Asset Management (in millions) Third-party revenues $ 615 $ 44 $ 558 $ 59 Intersegment revenues 7 27 6 29 Segment revenues 622 71 564 88 Segment expenses 354 75 147 91 Segment equity in earnings (losses) of investees 60 — (46) — Less: Segment provision (benefit) for income taxes 46 (1) 24 — Segment adjusted operating income (loss) $ 282 $ (3) $ 347 $ (3) The tables below present a reconciliation of significant components of segment information to the comparable consolidated amounts. Reconciliation of Segment Information to Consolidated Information Three Months Ended September 30, 2023 Equity in Earnings (Losses) of Investees Less: Net Income (Loss) Attributable to AGL Revenues Expenses Provision (Benefit) for Income Taxes Noncontrolling Interests (in millions) Segments: Insurance $ 208 $ 165 $ 25 $ 9 $ — $ 59 Asset Management — — — — — — Total segments 208 165 25 9 — 59 Corporate division 259 57 — 47 — 155 Other (4) (3) (7) (2) 2 (8) Subtotal 463 219 18 54 2 206 Reconciling items: Realized gains (losses) on investments (9) — — — — (9) Non-credit impairment-related unrealized fair value gains (losses) on credit derivatives 6 — — — — 6 Fair value gains (losses) on CCS (20) — — — — (20) Foreign exchange gains (losses) on remeasurement of premiums receivable and loss and LAE reserves (37) — — — — (37) Tax effect — — — (11) — 11 Total consolidated $ 403 $ 219 $ 18 $ 43 $ 2 $ 157 Reconciliation of Segment Information to Consolidated Information Three Months Ended September 30, 2022 Equity in Earnings (Losses) of Investees Less: Net Income (Loss) Attributable to AGL Revenues Expenses Provision (Benefit) for Income Taxes Noncontrolling Interests (in millions) Segments: Insurance $ 147 $ (16) $ (11) $ (7) $ — $ 159 Asset Management 21 24 — — — (3) Total segments 168 8 (11) (7) — 156 Corporate division 1 34 — (3) — (30) Other 13 2 (9) 1 (6) 7 Subtotal 182 44 (20) (9) (6) 133 Reconciling items: Realized gains (losses) on investments (14) — — — — (14) Non-credit impairment-related unrealized fair value gains (losses) on credit derivatives (50) (1) — — — (49) Fair value gains (losses) on CCS 1 — — — — 1 Foreign exchange gains (losses) on remeasurement of premiums receivable and loss and LAE reserves (78) — — — — (78) Tax effect — — — (18) — 18 Total consolidated $ 41 $ 43 $ (20) $ (27) $ (6) $ 11 Reconciliation of Segment Information to Consolidated Information Nine Months Ended September 30, 2023 Equity in Earnings (Losses) of Investees Less: Net Income (Loss) Attributable to AGL Revenues Expenses Provision (Benefit) for Income Taxes Noncontrolling Interests (in millions) Segments: Insurance $ 622 $ 354 $ 60 $ 46 $ — $ 282 Asset Management 71 75 — (1) — (3) Total segments 693 429 60 45 — 279 Corporate division 263 165 — 37 — 61 Other 28 12 (35) (8) 19 (30) Subtotal 984 606 25 74 19 310 Reconciling items: Realized gains (losses) on investments (20) — — — — (20) Non-credit impairment-related unrealized fair value gains (losses) on credit derivatives 108 (1) — — — 109 Fair value gains (losses) on CCS (35) — — — — (35) Foreign exchange gains (losses) on remeasurement of premiums receivable and loss and LAE reserves 9 — — — — 9 Tax effect — — — 10 — (10) Total consolidated $ 1,046 $ 605 $ 25 $ 84 $ 19 $ 363 Reconciliation of Segment Information to Consolidated Information Nine Months Ended September 30, 2022 Equity in Earnings (Losses) of Investees Less: Net Income (Loss) Attributable to AGL Revenues Expenses Provision (Benefit) for Income Taxes Noncontrolling Interests (in millions) Segments: Insurance $ 564 $ 147 $ (46) $ 24 $ — $ 347 Asset Management 88 91 — — — (3) Total segments 652 238 (46) 24 — 344 Corporate division 3 104 — (3) — (98) Other 34 14 15 3 25 7 Subtotal 689 356 (31) 24 25 253 Reconciling items: Realized gains (losses) on investments (39) — — — — (39) Non-credit impairment-related unrealized fair value gains (losses) on credit derivatives (51) (5) — — — (46) Fair value gains (losses) on CCS 12 — — — — 12 Foreign exchange gains (losses) on remeasurement of premiums receivable and loss and LAE reserves (180) — — — — (180) Tax effect — — — (30) — 30 Total consolidated $ 431 $ 351 $ (31) $ (6) $ 25 $ 30

Outstanding Exposure

Outstanding Exposure	9 Months Ended
	Sep. 30, 2023
Outstanding Exposure Disclosure [Abstract]
Outstanding Exposure	Outstanding Exposure The Company sells credit protection primarily in financial guaranty insurance form. The Company may also sell credit protection by issuing policies that guarantee payment obligations under credit default swaps (CDS). The Company’s contracts accounted for as credit derivatives are generally structured such that the circumstances giving rise to the Company’s obligation to make loss payments are similar to those for its financial guaranty insurance contracts. The Company seeks to limit its exposure to losses by underwriting obligations that it views to be investment grade at inception, although on occasion it may underwrite new issuances that it views to be below-investment-grade (BIG), typically as part of its loss mitigation strategy for existing troubled exposures. The Company also seeks to acquire portfolios of insurance from financial guarantors that are no longer writing new business by acquiring such companies or providing reinsurance on a portfolio of insurance; in such instances, it evaluates the risk characteristics of the target portfolio, which may include some BIG exposures, as a whole in the context of the proposed transaction. The Company diversifies its insured portfolio across sector and geography and, in the structured finance portfolio, generally requires subordination or collateral to protect it from loss. Reinsurance may be used in order to reduce net exposure to certain insured transactions. Public finance obligations insured by the Company primarily consist of general obligation bonds supported by the taxing powers of U.S. state or municipal governmental authorities, as well as tax-supported bonds, revenue bonds and other obligations supported by covenants from state or municipal governmental authorities or other municipal obligors to impose and collect fees and charges for public services or specific infrastructure projects. The Company includes within public finance obligations those obligations backed by the cash flow from leases or other revenues from projects serving substantial public purposes, including utilities, toll roads, healthcare facilities and government office buildings. The Company also includes within public finance obligations similar obligations issued by U.S. and non-U.S. sovereign and sub-sovereign issuers and governmental authorities. Structured finance obligations insured by the Company are generally issued by special purpose entities, including VIEs, and backed by pools of assets having an ascertainable cash flow or market value or other specialized financial obligations. Some of these VIEs are consolidated as described in Note 8, Financial Guaranty Variable Interest Entities and Consolidated Investment Vehicles. Unless otherwise specified, the outstanding par and debt service amounts presented in this note include outstanding exposures on these VIEs whether or not they are consolidated. The Company also writes specialty business that is consistent with its risk profile and benefits from its underwriting experience and other types of financial guaranties. Surveillance Categories The Company segregates its insured portfolio into investment grade and BIG surveillance categories to facilitate the appropriate allocation of resources to monitoring and loss mitigation efforts and to aid in establishing the appropriate cycle for periodic review of each exposure. BIG exposures include all exposures with internal credit ratings below BBB-. The Company’s internal credit ratings are based on internal assessments of the likelihood of default and loss severity in the event of default. Internal credit ratings are expressed on a ratings scale similar to that used by the rating agencies and generally reflect an approach similar to that employed by the rating agencies, except that the Company’s internal credit ratings focus on future performance rather than lifetime performance. The Company classifies those portions of risks benefiting from reimbursement obligations collateralized by eligible assets held in trust in acceptable reimbursement structures as being the higher of AA or their current internal rating. Unless otherwise noted, ratings disclosed herein on the Company’s insured portfolio reflect its internal ratings. The Company monitors its insured portfolio and refreshes its internal credit ratings on individual exposures in quarterly, semi-annual or annual cycles based on the Company’s view of the exposure’s credit quality, loss potential, volatility and sector. Ratings on exposures in sectors identified as under the most stress or with the most potential volatility are reviewed every quarter, although the Company may also review a rating in response to developments impacting a credit when a ratings review is not scheduled. For assumed exposures, the Company may use the ceding company’s credit ratings of transactions where it is impractical for it to assign its own rating. Exposures identified as BIG are subjected to further review to determine the probability of a loss. See Note 4, Expected Loss to be Paid (Recovered). Surveillance personnel then assign each BIG transaction to one of the three BIG surveillance categories described below based upon whether a future loss is expected and whether a claim has been paid. The Company uses the pre-tax book yield of the relevant subsidiary’s investment portfolio to calculate the present value of projected payments and recoveries and determine whether a future loss is expected in order to assign the appropriate BIG surveillance category to a transaction. For financial statement measurement purposes, the Company uses risk-free rates, which are determined each quarter, to calculate the expected loss. More extensive monitoring and intervention are employed for all BIG surveillance categories, with internal credit ratings reviewed quarterly. For purposes of determining the appropriate surveillance category, the Company expects “future losses” on a transaction when the Company believes there is at least a 50% chance that, on a present value basis, it will in the future pay claims on that transaction that will not be fully reimbursed. The three BIG surveillance categories are: • BIG Category 1: Below-investment-grade transactions showing sufficient deterioration to make future losses possible, but for which none are currently expected. • BIG Category 2: Below-investment-grade transactions for which future losses are expected but for which no claims (other than liquidity claims, which are claims that the Company expects to be reimbursed within one year) have yet been paid. • BIG Category 3: Below-investment-grade transactions for which future losses are expected and on which claims (other than liquidity claims) have been paid. Financial Guaranty Exposure The Company measures its financial guaranty exposure in terms of (i) gross and net par outstanding and (ii) gross and net debt service. The Company typically guarantees the payment of debt service when due. Since most of these payments are due in the future, the Company generally uses gross and net par outstanding as a proxy for its financial guaranty exposure. Gross par outstanding generally represents the principal amount of the insured obligation at a point in time. Net par outstanding equals gross par outstanding net of any reinsurance. The Company includes in its par outstanding calculation the impact of any consumer price index inflator to the reporting date as well as, in the case of accreting (zero-coupon) obligations, accretion to the reporting date. Non-U.S. dollar denominated par outstanding is translated at the spot rate at the end of the reporting period. The Company has, from time to time, purchased securities that it has insured, and for which it had expected losses to be paid, in order to mitigate the economic effect of insured losses (Loss Mitigation Securities). The Company excludes amounts attributable to Loss Mitigation Securities from par and debt service outstanding and instead reports Loss Mitigation Securities in the investment portfolio. The Company manages such securities as investments and not insurance exposure. As of September 30, 2023 and December 31, 2022, the Company excluded net par outstanding of $1.2 billion and $1.3 billion, respectively, primarily attributable to Loss Mitigation Securities. Gross debt service outstanding represents the sum of all estimated future debt service payments on the insured obligations, on an undiscounted basis. Net debt service outstanding equals gross debt service outstanding net of any reinsurance. Future debt service payments include the impact of any consumer price index inflator after the reporting date as well as, in the case of accreting (zero-coupon) obligations, accretion after the reporting date. The Company calculates its debt service outstanding as follows: • for insured obligations that are not supported by homogeneous pools of assets (which category includes most of the Company’s public finance transactions), as the total estimated contractual future debt service due through maturity, regardless of whether the obligations may be called and regardless of whether, in the case of obligations where principal payments are due when an underlying asset makes a principal payment, the Company believes the obligations will be repaid prior to contractual maturity; and • for insured obligations that are supported by homogeneous pools of assets that are contractually permitted to prepay principal (which category includes, for example, residential mortgage-backed securities (RMBS)), as the total estimated expected future debt service due on insured obligations through their respective expected terms, which includes the Company’s expectations as to whether the obligations may be called and, in the case of obligations where principal payments are due when an underlying asset makes a principal payment, when the Company expects principal payments to be made prior to contractual maturity. The calculation of debt service requires the use of estimates, which the Company updates periodically, including estimates and assumptions for the expected remaining term of insured obligations supported by homogeneous pools of assets, updated interest rates for floating and variable rate insured obligations, behavior of consumer price indices for obligations with consumer price index inflators, foreign exchange rates and other assumptions based on the characteristics of each insured obligation. Debt service is a measure of the estimated maximum potential exposure to insured obligations before considering the Company’s various legal rights to the underlying collateral and other remedies available to it under its financial guaranty contract. Actual debt service may differ from estimated debt service due to refundings, terminations, negotiated restructurings, prepayments, changes in interest rates on variable rate insured obligations, consumer price index behavior differing from that projected, changes in foreign exchange rates on non-U.S. dollar denominated insured obligations and other factors. Financial Guaranty Portfolio Debt Service and Par Outstanding As of September 30, 2023 As of December 31, 2022 Gross Net Gross Net (in millions) Debt Service Public finance $ 372,908 $ 372,711 $ 359,899 $ 359,703 Structured finance 11,290 11,265 10,273 10,248 Total financial guaranty $ 384,198 $ 383,976 $ 370,172 $ 369,951 Par Outstanding Public finance $ 231,871 $ 231,721 $ 224,254 $ 224,099 Structured finance 10,138 10,112 9,184 9,159 Total financial guaranty $ 242,009 $ 241,833 $ 233,438 $ 233,258 In addition to amounts shown in the table above, the Company had outstanding commitments to provide guaranties of $1.5 billion of public finance direct gross par and $1.3 billion of structured finance direct gross par as of September 30, 2023. These commitments are contingent on the satisfaction of all conditions set forth in the guaranties and may expire unused or be canceled at the counterparty’s request. Therefore, the total commitment amount does not necessarily reflect actual future guaranteed amounts. Financial Guaranty Portfolio by Internal Rating As of September 30, 2023 Public Finance Public Finance Structured Finance Structured Finance Total Rating Net Par % Net Par % Net Par % Net Par % Net Par % (dollars in millions) AAA $ 212 0.1 % $ 2,004 4.4 % $ 860 9.6 % $ 457 40.2 % $ 3,533 1.5 % AA 16,994 9.1 3,298 7.2 4,545 50.7 12 1.0 24,849 10.3 A 101,243 54.5 10,545 23.1 1,932 21.5 568 50.0 114,288 47.2 BBB 64,220 34.5 29,083 63.5 586 6.5 100 8.8 93,989 38.9 BIG 3,304 1.8 818 1.8 1,052 11.7 — — 5,174 2.1 Total net par outstanding $ 185,973 100.0 % $ 45,748 100.0 % $ 8,975 100.0 % $ 1,137 100.0 % $ 241,833 100.0 % Financial Guaranty Portfolio by Internal Rating As of December 31, 2022 Public Finance Public Finance Structured Finance Structured Finance Total Rating Net Par % Net Par % Net Par % Net Par % Net Par % (dollars in millions) AAA $ 222 0.1 % $ 1,967 4.4 % $ 926 11.2 % $ 469 50.4 % $ 3,584 1.5 % AA 16,241 9.1 3,497 7.9 4,633 56.3 12 1.3 24,383 10.5 A 96,807 53.9 9,271 20.9 1,075 13.1 340 36.5 107,493 46.1 BBB 62,570 34.8 28,747 64.6 479 5.8 110 11.8 91,906 39.4 BIG 3,796 2.1 981 2.2 1,115 13.6 — — 5,892 2.5 Total net par outstanding $ 179,636 100.0 % $ 44,463 100.0 % $ 8,228 100.0 % $ 931 100.0 % $ 233,258 100.0 % Financial Guaranty Portfolio Components of BIG Net Par Outstanding As of September 30, 2023 BIG Net Par Outstanding Net Par BIG 1 BIG 2 BIG 3 Total BIG Outstanding (in millions) Public finance: U.S. public finance $ 1,290 $ 926 $ 1,088 $ 3,304 $ 185,973 Non-U.S. public finance 818 — — 818 45,748 Public finance 2,108 926 1,088 4,122 231,721 Structured finance: U.S. RMBS 23 36 897 956 1,817 Other structured finance — 28 68 96 8,295 Structured finance 23 64 965 1,052 10,112 Total $ 2,131 $ 990 $ 2,053 $ 5,174 $ 241,833 Financial Guaranty Portfolio Components of BIG Net Par Outstanding As of December 31, 2022 BIG Net Par Outstanding Net Par BIG 1 BIG 2 BIG 3 Total BIG Outstanding (in millions) Public finance: U.S. public finance $ 2,364 $ 108 $ 1,324 $ 3,796 $ 179,636 Non-U.S. public finance 981 — — 981 44,463 Public finance 3,345 108 1,324 4,777 224,099 Structured finance: U.S. RMBS 18 39 953 1,010 1,956 Other structured finance — 34 71 105 7,203 Structured finance 18 73 1,024 1,115 9,159 Total $ 3,363 $ 181 $ 2,348 $ 5,892 $ 233,258 Financial Guaranty Portfolio BIG Net Par Outstanding and Number of Risks As of September 30, 2023 Net Par Outstanding Number of Risks (2) Description Financial Credit Total Financial Credit Total (dollars in millions) BIG 1 $ 2,115 $ 16 $ 2,131 102 2 104 BIG 2 980 10 990 13 2 15 BIG 3 2,024 29 2,053 109 7 116 Total BIG $ 5,119 $ 55 $ 5,174 224 11 235 Financial Guaranty Portfolio BIG Net Par Outstanding and Number of Risks As of December 31, 2022 Net Par Outstanding Number of Risks (2) Description Financial Credit Total Financial Credit Total (dollars in millions) BIG 1 $ 3,357 $ 6 $ 3,363 122 1 123 BIG 2 171 10 181 14 2 16 BIG 3 2,307 41 2,348 111 10 121 Total BIG $ 5,835 $ 57 $ 5,892 247 13 260 _____________________ (1) Includes FG VIEs. (2) A risk represents the aggregate of the financial guaranty policies that share the same revenue source for purposes of making debt service payments. Exposure to Puerto Rico The Company had insured exposure to obligations of various authorities and public corporations of the Commonwealth of Puerto Rico (Puerto Rico or the Commonwealth) as well as its general obligation bonds aggregating $1.1 billion and $1.4 billion net par outstanding as of September 30, 2023 and December 31, 2022, respectively. All of the Company’s insured exposure to Puerto Rico is rated BIG. The Company has paid claims as a result of payment defaults on all of its outstanding Puerto Rico exposures except the Municipal Finance Agency (MFA), the Puerto Rico Aqueduct and Sewer Authority (PRASA), and the University of Puerto Rico (U of PR), each of which has continued to make timely debt service payments. On June 30, 2016, the Puerto Rico Oversight, Management, and Economic Stability Act (PROMESA) was signed into law. PROMESA established a seven-member Financial Oversight and Management Board (the FOMB) with authority to require that balanced budgets and fiscal plans be adopted and implemented by Puerto Rico. Title III of PROMESA provides for a process analogous to a voluntary bankruptcy process under Chapter 9 of the United States Bankruptcy Code. After over five years of negotiations, a substantial portion of the Company’s Puerto Rico exposure was resolved in 2022 in accordance with four orders entered by the United States District Court of the District of Puerto Rico (Federal District Court of Puerto Rico) related to the Company’s exposure to all insured Puerto Rico credits experiencing payment default in 2022 except Puerto Rico Electric Power Authority (PREPA) (2022 Puerto Rico Resolutions). As a result of the 2022 Puerto Rico Resolutions, during 2022 the Company’s obligations under its insurance policies covering debt of the Puerto Rico Convention Center District Authority (PRCCDA) and Puerto Rico Infrastructure Authority (PRIFA) were extinguished, and its insurance exposure to Puerto Rico general obligations (GO) bonds, Public Buildings Authority (PBA) bonds and Puerto Rico Highway and Transportation Authority (PRHTA) bonds was greatly reduced. As described below, on August 31, 2023, the Company extinguished its remaining exposure to GO and PBA bonds by satisfying its obligations to insured bondholders holding custody receipts representing interests in legacy insured GO and PBA bonds. Under the Modified Eighth Amended Title III Joint Plan of Adjustment of the Commonwealth of Puerto Rico, the Employees Retirement System of the Government of the Commonwealth of Puerto Rico, and the Puerto Rico Public Buildings Authority (GO/PBA Plan), the Company received cash, new general obligation bonds (New GO Bonds) and contingent value instruments (CVIs). In connection with the Modified Fifth Amended Title III Plan of Adjustment for PRHTA (HTA Plan) and related arrangements, the Company received cash and new bonds backed by toll revenues (Toll Bonds, and together with the New GO Bonds, New Recovery Bonds) from the PRHTA and CVIs from the Commonwealth. Cash, New Recovery Bonds and CVIs received pursuant to the 2022 Puerto Rico Resolutions are collectively referred to as Plan Consideration. Plan Consideration is reported in either cash, investments or FG VIEs’ assets as described below. • Investments and cash. Plan Consideration received in respect of bondholders whose principal of bonds insured by the Company were accelerated against the Commonwealth and became due and payable under the 2022 Puerto Rico Resolutions are reported in Cash and Investments. See Note 7, Investments, for the fair value of the New Recovery Bonds and CVIs remaining as of September 30, 2023. • FG VIEs’ assets. Plan Consideration received in respect of insured bondholders who elected to receive custody receipts that represent an interest in custodial trusts that hold the legacy insurance policy plus Plan Consideration that constitute distributions under the HTA Plan or the GO/PBA Plan are reported in FG VIEs’ assets. The Company’s insurance policy continues to guarantee principal and interest coming due on the legacy insured bonds in accordance with the terms of such insurance policy on the originally scheduled legacy bond interest and principal payment dates to the extent that distributions of Plan Consideration are insufficient to pay or prepay such amounts. On August 31, 2023, after notice to certain holders of custody receipts representing interests in legacy insured GO, PBA and HTA bonds, the Company satisfied its obligations under such legacy insured bonds with respect to $108 million net par outstanding as of August 31, 2023, and the custodial trusts released to AGC and AGM New Recovery Bonds and CVIs with a fair value totaling $73 million as of August 31, 2023. See Note 8, Financial Guaranty Variable Interest Entities and Consolidated Investment Vehicles, for the fair value of New Recovery Bonds remaining as of September 30, 2023. The Company has sold a portion of New Recovery Bonds and CVIs it received and may sell in the future any New Recovery Bonds or CVIs it continues to hold. The fair value of any New Recovery Bonds and CVIs that the Company retains will fluctuate from their date of acquisition. Any gains or losses on sales of New Recovery Bonds and CVIs in the investment portfolio are reported as realized gains and losses on investments and fair value gains (losses) on trading securities, respectively, rather than loss and LAE. The CVIs are intended to provide creditors with additional recoveries tied to the outperformance of the Puerto Rico 5.5% Sales and Use Tax (SUT) receipts against May 2020 certified fiscal plan projections, subject to annual and lifetime caps. The notional amount of a CVI represents the sum of the maximum distributions the holder could receive under the CVI, subject to the cumulative and annual caps, if the SUT sufficiently exceeds 2020 certified fiscal plan projections, without any discount for time. As of September 30, 2023, all of the CVIs are reported in investments. The Company is continuing its efforts to resolve the one remaining Puerto Rico insured exposure that is in payment default, PREPA. Economic, political and legal developments, including inflation and increases in the cost of petroleum products, may impact any resolution of the Company’s PREPA insured exposure and the value of any remaining consideration received in connection with the 2022 Puerto Rico Resolutions or any future resolutions of the Company’s PREPA insured exposures. The impact of developments relating to Puerto Rico during any quarter or year could be material to the Company’s results of operations and shareholders’ equity. Puerto Rico Par and Debt Service Schedules All Puerto Rico exposures are internally rated BIG. The following tables show the Company’s insured exposure to general obligation bonds of Puerto Rico and various obligations of its related authorities and public corporations. Puerto Rico Gross Par and Gross Debt Service Outstanding Gross Par Outstanding Gross Debt Service Outstanding As of As of September 30, 2023 December 31, 2022 September 30, 2023 December 31, 2022 (in millions) Exposure to Puerto Rico $ 1,121 $ 1,378 $ 1,529 $ 1,899 Puerto Rico Net Par Outstanding As of September 30, 2023 December 31, 2022 (in millions) Defaulted Puerto Rico Exposures PREPA $ 624 $ 720 Total Defaulted 624 720 Resolved Puerto Rico Exposures PRHTA (Transportation revenue) (1) 244 298 PRHTA (Highway revenue) (1) 128 182 Commonwealth of Puerto Rico - GO (1) — 25 PBA (1) — 4 Total Resolved 372 509 Other Puerto Rico Exposures MFA (2) 108 131 PRASA and U of PR (2) 1 1 Total Other 109 132 Total net exposure to Puerto Rico $ 1,105 $ 1,361 ____________________ (1) Resolved pursuant to the 2022 Puerto Rico Resolutions. (2) All debt service on these insured exposures have been paid to date without any insurance claim being made on the Company. The following table shows the scheduled amortization of the insured general obligation bonds of Puerto Rico and various obligations of its related authorities and public corporations. The Company guarantees payment of interest and principal when those amounts are scheduled to be paid and cannot be required to pay on an accelerated basis, although in certain circumstances it may elect to do so. In the event that obligors default on their obligations, the Company would only be required to pay the shortfall between the debt service due in any given period and the amount paid by the obligors. Amortization Schedule of Puerto Rico Net Par Outstanding and Net Debt Service Outstanding As of September 30, 2023 Scheduled Net Par Amortization Scheduled Net Debt Service Amortization (in millions) 2023 (October 1 - December 31) $ — $ 3 2024 (January 1 - March 31) — 24 2024 (April 1 - June 30) — 3 2024 (July 1 - September 30) 110 134 2024 (October 1 - December 31) — 3 Subtotal 2024 110 164 2025 84 132 2026 140 185 2027 120 158 2028-2032 293 427 2033-2037 235 302 2038-2041 123 140 Total $ 1,105 $ 1,511 PREPA As of September 30, 2023, the Company had $624 million insured net par outstanding of PREPA obligations. The Company believes that the PREPA bonds are secured by a lien on the revenues of the electric system. On April 8, 2022, Judge Laura Taylor Swain of the Federal District Court of Puerto Rico issued an order appointing as members of a PREPA mediation team U.S. Bankruptcy Judges Shelley Chapman (lead mediator), Robert Drain and Brendan Shannon. Judge Swain also entered a separate order establishing the terms and conditions of mediation, including that the mediation would terminate on June 1, 2022. Judge Swain has since extended the term of such mediation several times, most recently on September 29, 2023 extending the term to March 29, 2024. The FOMB filed an initial plan of adjustment and disclosure statement for PREPA with the Federal District Court of Puerto Rico on December 16, 2022, and filed an amended version on February 9, 2023 (FOMB PREPA Plan). On March 22, 2023, the Federal District Court of Puerto Rico held that the PREPA bondholders had perfected liens only in revenues that had been deposited in the sinking fund established under the PREPA trust agreement and related funds over which the bond trustee had control but did not have a lien in future revenues until deposited in those funds. The Federal District Court of Puerto Rico also held, however, that PREPA bondholders do have recourse under the PREPA trust agreement in the form of an unsecured net revenue claim. At that time, the Federal District Court of Puerto Rico declined to value the unsecured net revenue claim or the method for its determination. The ultimate value of the claim, according to the Federal District Court of Puerto Rico, should be determined through a claim estimation proceeding. On June 6-8, 2023, the Federal District Court of Puerto Rico held a claim estimation proceeding and, on June 26, 2023, issued an opinion and order estimating the unsecured net revenue claim to be $2.4 billion as of July 3, 2017. This estimate included a determination that PREPA’s discounted cash flows, using FOMB’s base-case incremental net revenues over a 100-year collection period and a discount rate of 7%, would be $3.0 billion, and should be reduced by an additional 20% for collection risk. PREPA bondholders had sought an unsecured net revenue claim of approximately $8.5 billion. The Company expects to appeal portions of the March 22, 2023 decision, including the lien scope ruling and the need for a claim estimation proceeding, as well as the June 26, 2023 claim estimation ruling, upon final adjudication by the Federal District Court of Puerto Rico of all claims and counterclaims in the PREPA lien challenge adversary proceeding. On October 27, 2023, the FOMB filed with the Federal District Court of Puerto Rico the third modified third amended plan of adjustment for PREPA and supporting supplemental disclosure statement (FOMB PREPA Plan) based on the last revised PREPA fiscal plan certified by the FOMB on June 23, 2023 (2023 PREPA Fiscal Plan). The FOMB PREPA Plan would split bondholders into two groups: one that would settle litigation regarding whether creditor repayment is limited to existing accounts, and another group that would continue litigating whether bondholders are secured by PREPA’s current and future revenue collections. The FOMB PREPA Plan also would further split settling bondholders into two sub-groups: one consisting of certain original settling bondholders that would receive an enhanced recovery (compared to non-settling bondholders) plus other supporting creditor payments, while the second settling sub-group would receive only the enhanced recovery. The FOMB asserts that, other than for pension claims, PREPA’s debt capacity is $2.5 billion, of which approximately $1.4 billion is allocated to settling creditors. The remaining $1.1 billion is allocated pro rata to (i) non-settling bondholders, and (ii) general unsecured creditors (GUCs). The most recent revised FOMB PREPA Plan provides for reduced payments to bondholders since lower projected PREPA revenues are included in the 2023 PREPA Fiscal Plan than had been previously anticipated. The FOMB PREPA Plan estimates that non-settling bondholders will receive a recovery of 12.5% of their allowed unsecured net revenue claim. The Company is opposed to the FOMB PREPA Plan and has joined with a group of non-settling bondholders that continue to litigate whether creditor repayments will include future revenue collections. The supplemental disclosure statement hearing for the FOMB PREPA Plan is scheduled for November 14, 2023. The confirmation hearing for the FOMB PREPA Plan is currently scheduled to occur in March 2024. PRHTA As of September 30, 2023, the Company had $372 million of insured net par outstanding of PRHTA bonds: $244 million insured net par outstanding of PRHTA (transportation revenue) bonds and $128 million insured net par outstanding of PRHTA (highway revenue) bonds. PRHTA net par outstanding primarily represents the Company’s exposure in respect of insured bondholders who elected to receive custody receipts that represent an interest in the legacy insurance policy plus Toll Bonds that constitute distributions under the HTA Plan. Puerto Rico GO and PBA The Company’s exposure to GO bonds and PBA bonds was extinguished on August 31, 2023, and, therefore, as of September 30, 2023, the Company had no remaining insured net par outstanding of GO bonds and PBA bonds. Other Puerto Rico Exposures All debt service payments for the Company’s remaining Puerto Rico exposures of $109 million insured net par outstanding have been made in full by the obligors as of the date of this filing. These exposures consist primarily of $108 million net par outstanding of MFA bonds, which are secured by a lien on local tax revenues. Puerto Rico Litigation Currently, there are numerous legal actions relating to the default by the Commonwealth and certain of its instrumentalities on debt service payments, and related matters, and the Company is a party to a number of them. The Company has taken legal action, and may take additional legal action in the future, to enforce its rights with respect to Puerto Rico obligations which the Company insures. In addition, the Commonwealth, the FOMB and others have taken legal action naming the Company as party. A number of legal actions involving the Company and relating to the Commonwealth, PRCCDA and PRIFA, as well as claims related to the clawback of certain excise taxes and revenues pledged to secure bonds issued by PRHTA, were resolved on March 15, 2022, and all remaining legal actions involving the Company and relating to PRHTA were resolved on December 6, 2022, which together comprised the consummation of the 2022 Puerto Rico Resolutions. Except for one proceeding related to PREPA, all proceedings involving the Company and relating to the default by the Commonwealth or its instrumentalities remain stayed pending the Federal District Court of Puerto Rico's determination on plans of adjustment or other proceedings. The following Puerto Rico proceeding in which the Company is involved is no longer stayed: • On July 1, 2019, the FOMB initiated an adversary proceeding against U.S. Bank National Association, as trustee for PREPA’s bonds, objecting to and challenging the validity, enforceability, and extent of prepetition security interests securing those bonds and seeking other relief. On September 30, 2022, the FOMB filed an amended complaint against the trustee (i) objecting to and challenging the validity, enforceability, and extent of prepetition security interests securing PREPA’s bonds and (ii) arguing that PREPA bondholders’ recourse was limited to certain deposit accounts held by the trustee. On October 7, 2022, the court approved a stipulation permitting AGM and AGC to intervene as defendants. Summary judgment motions were filed by plaintiffs and defendants on October 24, 2022. As noted above, on March 22, 2023, the Federal District Court of Puerto Rico granted in part and denied in part each party’s cross-motions for summary judgment. The Federal District Court of Puerto Rico found that the PREPA bondholders had perfected liens only in revenues that had been deposited in the sinking fund established under the PREPA trust agreement and related funds over which the bond trustee had control. The Federal District Court of Puerto Rico also held that the PR

Expected Loss to be Paid (Recov

Expected Loss to be Paid (Recovered)	9 Months Ended
	Sep. 30, 2023
Expected Losses [Abstract]
Expected Loss to be Paid (Recovered)	Expected Loss to be Paid (Recovered) Expected loss to be paid (recovered) is equal to the present value of expected future cash outflows for loss and LAE payments, net of: (i) inflows for expected salvage, subrogation and other recoveries; and (ii) excess spread on underlying collateral, as applicable. Cash flows are discounted at current risk-free rates. The Company updates the discount rates each quarter and reflects the effect of such changes in economic loss development. Net expected loss to be paid (recovered) is net of amounts ceded to reinsurers. The Company’s net expected loss to be paid (recovered) incorporates management’s probability weighted scenarios. Expected cash outflows and inflows are probability weighted cash flows that reflect management’s assumptions about the likelihood of all possible outcomes based on all information available to the Company. Those assumptions consider the relevant facts and circumstances and are consistent with the information tracked and monitored through the Company’s surveillance and risk management functions. Expected loss to be paid (recovered) is important in that it represents the present value of amounts that the Company expects to pay or recover in future periods for all contracts. In circumstances where the Company purchased its own insured obligations that had expected losses, and in cases where issuers of insured obligations elected or the Company and an issuer mutually agreed as part of a negotiation to deliver the underlying collateral, insured obligation or a new security to the Company, expected loss to be paid (recovered) is reduced and the asset received is prospectively accounted for under the applicable guidance for that instrument. Insured obligations with expected losses that were purchased by the Company are referred to as Loss Mitigation Securities and are recorded in the investment portfolio at fair value, excluding the value of the Company’s insurance. For Loss Mitigation Securities, the difference between the purchase price of the insured obligation and the fair value excluding the value of the Company’s insurance (on the date of acquisition) is treated as a paid loss. See Note 7, Investments, and Note 9, Fair Value Measurement. Economic loss development represents the change in net expected loss to be paid (recovered) attributable to the effects of changes in the economic performance of insured transactions, changes in assumptions based on observed market trends, changes in discount rates, accretion of discount and the economic effects of loss mitigation efforts. In order to effectively evaluate and manage the economics and liquidity of the entire insured portfolio, management assigns ratings and calculates expected loss to be paid (recovered) in the same manner for all its exposures regardless of form or differing accounting models. The exposure reported in Note 3, Outstanding Exposure includes policies accounted for under various accounting models depending on the characteristics of the contract and the Company’s control rights. The three primary models are: (1) insurance, as described in Note 5, Contracts Accounted for as Insurance; (2) derivatives, as described in Note 6, Contracts Accounted for as Credit Derivatives, and Note 9, Fair Value Measurement; and (3) FG VIE consolidation, as described in Note 8, Financial Guaranty Variable Interest Entities and Consolidated Investment Vehicles. The Company has paid and expects to pay future losses and/or recover past losses on policies which fall under each of these accounting models. This note provides information regarding expected claim payments to be made and/or recovered under all contracts in the insured portfolio. Loss Estimation Process The Company’s loss reserve committees estimate expected loss to be paid (recovered) for all contracts by reviewing analyses that consider various scenarios with corresponding probabilities assigned to them. Depending upon the nature of the risk, the Company’s view of the potential size of any loss and the information available to the Company, that analysis may be based upon individually developed cash flow models, internal credit rating assessments, sector-driven loss severity assumptions and/or judgmental assessments. In the case of its assumed business, the Company may conduct its own analysis as just described or, depending on the Company’s view of the potential size of any loss and the information available to the Company, the Company may use loss estimates provided by ceding insurers. The Company monitors the performance of its transactions with expected losses and each quarter the Company’s loss reserve committees review and refresh their loss projection assumptions, scenarios and the probabilities they assign to those scenarios based on actual developments during the period and their view of future performance. The financial guaranties issued by the Company insure the credit performance of the guaranteed obligations over an extended period of time, in some cases over 30 years, and in most circumstances the Company has no right to cancel such financial guaranties. As a result, the Company’s estimate of ultimate loss on a policy is subject to significant uncertainty over the life of the insured transaction. Credit performance can be adversely affected by economic, fiscal and financial market variability over the life of most contracts. The Company does not use traditional actuarial approaches to determine its estimates of expected losses. The determination of expected loss to be paid (recovered) is an inherently subjective process involving numerous estimates, assumptions and judgments by management, using both internal and external data sources with regard to frequency, severity of loss, economic projections, governmental actions, negotiations, recovery rates, delinquency and prepayment rates (with respect to RMBS), timing of cash flows, and other factors that affect credit performance. These estimates, assumptions and judgments, and the factors on which they are based, may change materially over a reporting period, and have a material effect on the Company’s financial statements. Each quarter, the Company may revise its scenarios and update its assumptions, including the probability weightings of its scenarios based on public information as well as nonpublic information obtained through its surveillance and loss mitigation activities. Changes over a reporting period in the Company’s loss estimates for public finance obligations supported by specified revenue streams, such as revenue bonds issued by toll road authorities, municipal utilities or airport authorities, generally will be influenced by factors impacting their revenue levels, such as changes in demand; changing demographics; and other economic factors, especially if the obligations do not benefit from financial support from other tax revenues or governmental authorities. Changes over a reporting period in the Company’s loss estimates for its tax-supported and general obligation public finance transactions generally will be influenced by factors impacting the public issuer’s ability and willingness to pay, such as changes in the economy and population of the relevant area; changes in the issuer’s ability or willingness to raise taxes, decrease spending or receive federal assistance; new legislation; rating agency actions that affect the issuer’s ability to refinance maturing obligations or issue new debt at a reasonable cost; changes in the priority or amount of pensions and other obligations owed to workers; developments in restructuring or settlement negotiations; and other political and economic factors. Changes in loss estimates may also be affected by the Company’s loss mitigation efforts and other variables. Changes in the Company’s loss estimates for structured finance transactions generally will be influenced by factors impacting the performance of the assets supporting those transactions. For example, changes over a reporting period in the Company’s loss estimates for its RMBS transactions may be influenced by factors such as the level and timing of loan defaults experienced, changes in housing prices, results from the Company’s loss mitigation activities, and other variables. Net economic loss development (benefit) over a reporting period may be attributable to a number of interrelated factors such as changes in discount rates, improvement or deterioration of transaction performance, charge-offs, loss mitigation activity, changes to projected default curves, severity rates and dispute resolution. Actual losses will ultimately depend on future events, transaction performance or other factors that are difficult to predict. As a result, the Company’s current projections of losses may be subject to considerable volatility and may not reflect the Company’s ultimate claims paid. In some instances, the terms of the Company’s policy or the terms of certain workout orders and resolutions give it the option to pay principal losses that have been recognized in the transaction but which it is not yet required to pay, thereby reducing the amount of guaranteed interest due in the future. The Company has sometimes exercised this option, which results in an acceleration of cash outflows but reduces overall losses paid. Net Expected Loss to be Paid (Recovered) and Net Economic Loss Development (Benefit) by Accounting Model Net Expected Loss to be Paid (Recovered) Net Economic Loss Development (Benefit) As of Third Quarter Nine Months Accounting Model September 30, 2023 December 31, 2022 2023 2022 2023 2022 (in millions) Insurance (see Note 5) $ 252 $ 205 $ 92 $ (67) $ 160 $ (137) FG VIEs (see Note 8) (1) 235 314 (6) (6) (15) (16) Credit derivatives (see Note 6) 3 3 1 1 2 5 Total $ 490 $ 522 $ 87 $ (72) $ 147 $ (148) ____________________ (1) The net expected loss to be paid for FG VIEs primarily relates to trusts established as part of the 2022 Puerto Rico Resolutions (Puerto Rico Trusts) that were consolidated. The following tables present a roll forward of net expected loss to be paid (recovered) for all contracts, which are accounted for under one of the following accounting models: insurance, derivative and FG VIE. The Company used risk-free rates for U.S. dollar denominated obligations that ranged from 4.51% to 5.45% with a weighted average of 4.80% as of September 30, 2023 and 3.82% to 4.69% with a weighted average of 4.08% as of December 31, 2022. Net expected losses to be paid for U.S. dollar denominated transactions represented approximately 98.2% and 98.5% of the total as of September 30, 2023 and December 31, 2022, respectively. Net Expected Loss to be Paid (Recovered) Roll Forward Third Quarter Nine Months 2023 2022 2023 2022 (in millions) Net expected loss to be paid (recovered), beginning of period $ 560 $ 442 $ 522 $ 411 Economic loss development (benefit) due to: Accretion of discount 6 3 15 8 Changes in discount rates (12) (25) (8) (114) Changes in timing and assumptions 93 (50) 140 (42) Total economic loss development (benefit) 87 (72) 147 (148) Net (paid) recovered losses (1) (157) 357 (179) 464 Net expected loss to be paid (recovered), end of period $ 490 $ 727 $ 490 $ 727 ____________________ (1) Net (paid) recovered losses in 2023 include recoveries related to various Puerto Rico securities transferred to the Company's investment portfolio upon the maturity and extinguishment of certain GO, PBA and HTA insured exposure. Net (paid) recovered losses in 2022 include the net amounts received pursuant to the 2022 Puerto Rico Resolutions, as described in Note 3, Outstanding Exposure. Net Expected Loss to be Paid (Recovered) Roll Forward by Sector Third Quarter 2023 Sector Net Expected Loss to be Paid (Recovered) as of June 30, 2023 Net Economic Loss Net (Paid) Recovered Losses (1) Net Expected Loss to be Paid (Recovered) as of September 30, 2023 (in millions) Public finance: U.S. public finance $ 433 $ 135 $ (169) $ 399 Non-U.S. public finance 10 (1) — 9 Public finance 443 134 (169) 408 Structured finance: U.S. RMBS 73 (48) 13 38 Other structured finance 44 1 (1) 44 Structured finance 117 (47) 12 82 Total $ 560 $ 87 $ (157) $ 490 Third Quarter 2022 Sector Net Expected Loss to be Paid (Recovered) as of June 30, 2022 Net Economic Loss Net (Paid) Recovered Losses (1) Net Expected Loss to be Paid (Recovered) as of September 30, 2022 (in millions) Public finance: U.S. public finance $ 210 $ 24 $ 392 $ 626 Non-U.S. public finance 7 (2) 1 6 Public finance 217 22 393 632 Structured finance: U.S. RMBS 179 (95) (32) 52 Other structured finance 46 1 (4) 43 Structured finance 225 (94) (36) 95 Total $ 442 $ (72) $ 357 $ 727 Nine Months 2023 Sector Net Expected Loss to be Paid (Recovered) as of December 31, 2022 Net Economic Loss Net (Paid) Recovered Losses (1) Net Expected Loss to be Paid (Recovered) as of September 30, 2023 (in millions) Public finance: U.S. public finance $ 403 $ 193 $ (197) $ 399 Non-U.S. public finance 9 — — 9 Public finance 412 193 (197) 408 Structured finance: U.S. RMBS 66 (52) 24 38 Other structured finance 44 6 (6) 44 Structured finance 110 (46) 18 82 Total $ 522 $ 147 $ (179) $ 490 Nine Months 2022 Sector Net Expected Loss to be Paid (Recovered) as of December 31, 2021 Net Economic Loss Net (Paid) Recovered Losses (1) Net Expected Loss to be Paid (Recovered) as of September 30, 2022 (in millions) Public finance: U.S. public finance $ 197 $ (16) $ 445 $ 626 Non-U.S. public finance 12 (6) — 6 Public finance 209 (22) 445 632 Structured finance: U.S. RMBS 150 (127) 29 52 Other structured finance 52 1 (10) 43 Structured finance 202 (126) 19 95 Total $ 411 $ (148) $ 464 $ 727 ____________________ (1) Net of ceded paid losses, whether or not such amounts have been settled with reinsurers. Ceded paid losses are typically settled 45 days after the end of the reporting period. Such amounts are recorded as reinsurance recoverable on paid losses in “other assets.” The tables above include (i) net LAE paid of $9 million, $5 million, $17 million and $25 million for third quarter 2023, third quarter 2022, nine months 2023 and nine months 2022, respectively, and (ii) net expected LAE to be paid of $29 million and $11 million as of September 30, 2023 and December 31, 2022, respectively. Public Finance The largest component of public finance net expected losses to be paid (recovered) and net economic loss development (benefit) are U.S. exposures, including Puerto Rico exposures, which are discussed in Note 3, Outstanding Exposure. U.S. RMBS Loss Projections The Company projects losses on its insured U.S. RMBS on a transaction-by-transaction basis by projecting the performance of the underlying pool of mortgages over time and then applying the structural features (e.g., payment priorities and tranching) of the RMBS and any expected representation and warranty (R&W) recoveries/payables to the projected performance of the collateral over time. The resulting projected claim payments or reimbursements are then discounted using risk-free rates. Each period the Company reviews the assumptions it uses to make RMBS loss projections with consideration of updates on the performance of its insured transactions (including early-stage delinquencies, late-stage delinquencies and loss severity) as well as the residential property market and economy in general. To the extent it observes changes, it makes a judgment as to whether those changes are normal fluctuations or part of a more prolonged trend. The assumptions that the Company uses to project RMBS losses are shown in the sections below. Net Economic Loss Development (Benefit) U.S. RMBS Third Quarter Nine Months 2023 2022 2023 2022 (in millions) First lien U.S. RMBS $ (12) $ (38) $ (12) $ (34) Second lien U.S. RMBS (36) (57) (40) (93) First Lien U.S. RMBS Loss Projections: Alt-A, Prime, Option ARM and Subprime The majority of projected losses in first lien U.S. RMBS transactions are expected to come from non-performing mortgage loans (those that are or have recently been two or more payments behind, have been modified, are in foreclosure, or have been foreclosed upon). Changes in the amount of non-performing loans from the amount projected in the previous period are one of the primary drivers of loss projections in this portfolio. In order to project the number of defaults arising from these delinquent and foreclosed loans, the Company applies a liquidation rate assumption to loans in each of various non-performing categories. The Company arrived at its liquidation rates based on data purchased from a third-party provider and assumptions about how delays in the foreclosure process and loan modifications may ultimately affect the rate at which loans are liquidated. Each quarter the Company reviews recent data and (if necessary) adjusts its liquidation rates based on its observations. The following table shows liquidation assumptions for various non-performing and re-performing categories. First Lien U.S. RMBS Liquidation Rates As of September 30, 2023 December 31, 2022 Current but recently delinquent Alt-A and Prime 20% 20% Option ARM 20% 20% Subprime 20% 20% 30 – 59 Days Delinquent Alt-A and Prime 35% 35% Option ARM 35% 35% Subprime 30% 30% 60 – 89 Days Delinquent Alt-A and Prime 40% 40% Option ARM 45% 45% Subprime 40% 40% 90+ Days Delinquent Alt-A and Prime 55% 55% Option ARM 60% 60% Subprime 45% 45% Bankruptcy Alt-A and Prime 45% 45% Option ARM 50% 50% Subprime 40% 40% Foreclosure Alt-A and Prime 60% 60% Option ARM 65% 65% Subprime 55% 55% Real Estate Owned All 100% 100% While the Company uses the liquidation rates above to project defaults of non-performing loans (including current loans that were recently modified or delinquent), it projects defaults on presently current loans by applying a conditional default rate (CDR) curve. The start of that CDR curve is based on the defaults the Company projects will emerge from currently nonperforming, recently nonperforming and modified loans. The total amount of expected defaults from the non-performing loans is translated into a constant CDR (i.e., the CDR plateau), which, if applied for each of the next 36 months, results in the projection of the defaults that are expected to emerge from the various delinquency categories. The CDR thus calculated individually on the delinquent collateral pool for each RMBS is then used as the starting point for the CDR curve used to project defaults of the presently performing loans. In the most heavily weighted scenario (the base scenario), after the 36-month CDR plateau period, each transaction’s CDR is projected to improve over 12 months to a final CDR of 5% of the plateau CDR. In the base scenario, the Company assumes the final CDR will be reached one year after the 36-month CDR plateau period. Under the Company’s methodology, defaults projected to occur in the first 36 months represent defaults that can be attributed to loans that were recently modified or delinquent, or that are currently delinquent or in foreclosure, while the defaults projected to occur using the projected CDR trend after the first 36-month period represent defaults attributable to borrowers that are currently performing or are projected to re-perform. Another important driver of loss projections is loss severity, which is the amount of loss the transaction incurs on a loan after the application of net proceeds from the disposal of the underlying property. The Company assumes in the base scenario that recent (still historically elevated) loss severities will improve after loans with accumulated delinquencies and foreclosure cost are liquidated. The Company is assuming in the base scenario that the recent levels generally will continue for another 18 months. The Company determines its initial loss severity based on actual recent experience. Each quarter the Company reviews available data and (if necessary) adjusts its severities based on its observations. The Company then assumes that loss severities begin returning to levels consistent with underwriting assumptions beginning after the initial 18-month period, declining to 40% in the base scenario over 2.5 years. The following table shows the range as well as the average, weighted by outstanding net insured par, for key assumptions used in the calculation of expected loss to be paid (recovered) for individual transactions for vintage 2004 - 2008 first lien U.S. RMBS. Key Assumptions in Base Scenario Expected Loss Estimates First Lien U.S. RMBS As of September 30, 2023 As of December 31, 2022 Range Weighted Average Range Weighted Average Alt-A and Prime: Plateau CDR 0.3 % - 9.7% 3.8% 1.6 % - 11.5% 5.1% Final CDR 0.0 % - 0.5% 0.2% 0.1 % - 0.6% 0.3% Initial loss severity: 2005 and prior 50% 50% 2006 50% 50% 2007+ 50% 50% Option ARM: Plateau CDR 0.0 % - 9.2% 3.6% 2.0 % - 7.7% 4.3% Final CDR 0.0 % - 0.5% 0.2% 0.1 % - 0.4% 0.2% Initial loss severity: 2005 and prior 50% 50% 2006 50% 50% 2007+ 50% 50% Subprime: Plateau CDR 0.2 % - 9.6% 4.7% 2.7 % - 9.7% 5.6% Final CDR 0.0 % - 0.5% 0.2% 0.1 % - 0.5% 0.3% Initial loss severity: 2005 and prior 50% 50% 2006 50% 50% 2007+ 50% 50% The rate at which the principal amount of loans is voluntarily prepaid may impact both the amount of losses projected (since that amount is a function of the CDR, the loss severity and the loan balance over time) as well as the amount of excess spread (the amount by which the interest paid by the borrowers on the underlying loan exceeds the amount of interest owed on the insured obligations). The assumption for the voluntary conditional prepayment rate (CPR) follows a pattern similar to that of the CDR. The current level of voluntary prepayments is assumed to continue for the plateau period before gradually increasing over 12 months to the final CPR, which is assumed to be 15% in the base scenario. For transactions where the initial CPR is higher than the final CPR, the initial CPR is held constant and the final CPR is not used. These CPR assumptions are the same as those the Company used for December 31, 2022. The Company incorporates a recovery assumption into its reserving model to reflect observed trends in recoveries of deferred principal balances of modified first lien loans that had been previously written off. For transactions where the Company has detailed loan information, the Company assumes, in the base scenario, that 30% of the deferred loan balances will eventually be recovered upon sale of the collateral or refinancing of the loans. In the first quarter of 2023, in light of volatility in interest rates, the mortgage market and home prices, the Company began incorporating a 10% recovery of deferred principal balances in the most stressful scenario and a 50% recovery in the least stressful scenario. Additionally, in third quarter 2023, due to home prices reaching all time highs and high equity levels, the Company increased its scenario based recovery assumptions such that the weighted average recovery percentage increased from 20% to approximately 30%. The effect of these updated assumptions on expected losses was a benefit of $7 million. In estimating expected losses, the Company modeled and probability weighted sensitivities for first lien U.S. RMBS transactions by varying its assumptions of how fast a recovery is expected to occur. One of the variables used to model sensitivities was how quickly the CDR returned to its modeled equilibrium, which was defined as 5% of the plateau CDR. The Company also stressed CPR and the speed of recovery of loss severity rates. The Company probability weighted a total of five scenarios as of September 30, 2023 and December 31, 2022. Certain transactions benefit from excess spread when they are supported by large portions of fixed rate assets (either originally fixed or modified to be fixed) but have insured floating rate debt linked to Secured Overnight Finance Rate (SOFR). An increase in projected SOFR decreases excess spread, while lower SOFR results in higher excess spread. The Company used a similar approach to establish its scenarios as of September 30, 2023 as it used as of December 31, 2022, increasing and decreasing the periods of stress from those used in the base scenario, except as described above with regards to the increase in deferred principal recoveries. In the Company’s most stressful scenario where 10% of deferred principal balances were recovered, loss severities were assumed to rise and then recover over nine years and the initial ramp-down of the CDR was assumed to occur over 16 months, expected loss to be paid would increase from current projections by approximately $28 million for all first lien U.S. RMBS transactions. In the Company’s least stressful scenario where 50% of deferred principal balances are assumed to be recovered, the CDR plateau was six months shorter (30 months, effectively assuming that liquidation rates would improve) and the CDR recovery was more pronounced (including an initial ramp-down of the CDR over eight months), expected loss to be paid would decrease from current projections by approximately $20 million for all first lien U.S. RMBS transactions. Second Lien U.S. RMBS Loss Projections Second lien U.S. RMBS transactions include both home equity lines of credit (HELOC) and closed end second lien mortgages. The Company believes the primary variable affecting its expected losses in second lien RMBS transactions is the amount and timing of future losses or recoveries in the collateral pool supporting the transactions (including recoveries from previously charged-off loans). Expected losses are also a function of the structure of the transaction, the prepayment speeds of the collateral, the interest rate environment and assumptions about loss severity. The Company estimates the amount of loans that will default over the next several years by first calculating expected liquidation rates for delinquent loans, and applying liquidation rates to currently delinquent loans in order to arrive at an expected dollar amount of defaults from currently delinquent collateral (plateau period defaults). Similar to first lien U.S. RMBS transactions, the Company then calculates a CDR that will cause the targeted amount of liquidations to occur during the plateau period. For the base scenario, the CDR (the plateau CDR) is held constant for 36 months. Once the plateau period ends, the CDR is assumed to trend down in uniform increments for one year to its final long-term steady state CDR (5% of original plateau). HELOC loans generally permitted the borrower to pay only interest for an initial period (often ten years) and, after that period, require the borrower to make both the monthly interest payment and a monthly principal payment. This causes the borrower's total monthly payment to increase, sometimes substantially, at the end of the initial interest-only period. A substantial number of loans in the Company’s insured transactions had been modified to extend the interest-only period to 15 years. The majority of the modified loans had reset to fully amortizing by the end of 2022, and most of the remaining loans will reset over the next several years. Recently, the Company has observed the performance of the modified loans that have finally reset to full amortization (which represent the majority of extended loans), and noted low levels of delinquency, even with substantial increases in monthly payments. This observed performance lowers the level of uncertainty regarding this modified cohort as the remainder continue to reset. When a second lien loan defaults, there is generally a low recovery. The Company assumed, as of September 30, 2023 and December 31, 2022, that it will generally recover 2% of future defaulting collateral at the time of charge-off, with additional amounts of post charge-off recoveries projected to come in over time. A second lien on the borrower’s home may be retained in the Company’s second lien transactions after the loan is charged off and the loss applied to the transaction, particularly in cases where the holder of the first lien has not foreclosed. If the second lien is retained and the value of the home increases, the servicer may be able to use the second lien to increase recoveries, either by arranging for the borrower to resume payments or by realizing value upon the sale of the underlying real estate. The Company evaluates its assumptions quarterly based on actual recoveries of charged-off loans observed from period to period and reasonable expectations of future recoveries. In instances where the Company is able to obtain information on the lien status of charged-off loans, it assumes there will be a certain level of future recoveries of the balance of the charged-off loans where the second lien is still intact. The Company’s base scenario recovery assumption for charged-off loans is 40% (up from 30% in the prior quarters), as shown in the table below, based on observed trends and reasonable expectations of future recoveries. Such recoveries are assumed to be received evenly over the next five years. In the first quarter of 2023, in light of volatility in interest rates, the mortgage market and home prices, as with the first lien deferred principal balances detailed earlier, the Company also expanded the range of potential recoveries as a percentage of charged off loan balances. In third quarter 2023, this range was further expanded to represent a potential for greater future recoveries due to home prices reaching new record highs. The assumptions for the current quarter ranged from a 10% recovery of charged-off loan balances in the most stressful scenario and an 80% recovery in the least stressful scenario. The effect of these updated assumptions on expected loss to be paid (recovered) was a benefit of $31 million. The rate at which the principal amount of loans is prepaid may impact both the amount of losses projected as well as the amount of excess spread. In the base scenario, an average CPR (based on experience of the past year) is assumed to continue until the end of the plateau before gradually increasing to the final CPR over the same period the CDR decreases. The final CPR is assumed to be 15% for second lien U.S. RMBS transactions (in the base scenario), which is lower than the historical average but reflects the Company’s continued uncertainty about the projected performance of the borrowers in these transactions. For transactions where the initial CPR is higher than the final CPR, the initial CPR is held constant and the final CPR is not used. This pattern is consistent with how the Company modeled the CPR as of December 31, 2022. To the extent that prepayments differ from projected levels, the Company’s projected excess spread and losses could materially change. In estimating expected losses, the Company modeled and probability weighted five scenarios, each with a different CDR curve applicable to the period preceding the return to the long-term steady state CDR. The Company believes that the level of the elevated CDR and the length of time it will persist and the ultimate prepayment rate are the primary drivers of the amount of losses the collateral will likely suffer. The following table shows the range as well as the average, weighted by net par outstanding, for key assumptions used in the calculation of expected loss to be paid (recovered) for individual transactions for vintage 2004 - 2008 HELOCs. Key Assumptions in Base Scenario Expected Loss Estimates HELOCs As of September 30, 2023 As of December 31, 2022 Range Weighted Average Range Weighted Average Plateau CDR 0.4 % - 8.7% 2.7% 0.4 % - 8.4% 3.5% Final CDR trended down to 0.0 % - 0.4% 0.1% 0.0 % - 0.4% 0.2% Liquidation rates: Current but recently delinquent 20% 20% 30 – 59 Days Delinquent 30 30 60 – 89 Days Delinquent 40 40 90+ Days Delinquent 60 60 Bankruptcy 55 55 Foreclosure 55 55 Real Estate Owned 100 100 Loss severity on future defaults 98% 98% Projected future recoveries on previously charged-off loans 40% 30% The Company continues to evaluate the assumptions affecting its modeling results. The Company believes the most important driver of its projected second lien RMBS losses is the performance of its HELOC transactions. The Company modeled scenarios with a longer period of elevated defaults and others with a shorter period of elevated defaults. In the Company’s most stressful scenario, assuming 10% recoveries on charged-off loans, increasing the CDR plateau to 42 months and increasing the ramp-down by four months to 16 months (for a total stress period of 58 months) would decrease the expected recovery by approximately $89 million for HELOC transactions. On the other hand, in the Company’s least stressful scenario

Contracts Accounted for as Insu

Contracts Accounted for as Insurance	9 Months Ended
	Sep. 30, 2023
Insurance [Abstract]
Contracts Accounted for as Insurance	Contracts Accounted for as InsuranceThe portfolio of outstanding exposures discussed in Note 3, Outstanding Exposure, and Note 4, Expected Loss to be Paid (Recovered), includes contracts that are accounted for as insurance contracts, derivatives and consolidated FG VIEs. Amounts presented in this note relate only to contracts accounted for as insurance, unless otherwise specified. See Note 6, Contracts Accounted for as Credit Derivatives, for amounts related to CDS and Note 8, Financial Guaranty Variable Interest Entities and Consolidated Investment Vehicles, for amounts that are accounted for as consolidated FG VIEs. Premiums Net Earned Premiums Third Quarter Nine Months 2023 2022 2023 2022 (in millions) Financial guaranty insurance: Scheduled net earned premiums $ 73 $ 70 $ 212 $ 219 Accelerations from refundings and terminations (1) 14 12 26 145 Accretion of discount on net premiums receivable 7 6 20 18 Financial guaranty insurance net earned premiums 94 88 258 382 Specialty net earned premiums 1 1 3 3 Net earned premiums $ 95 $ 89 $ 261 $ 385 ____________________ (1) Nine months 2022 accelerations included $104 million related to PRCCDA, PRIFA and GO/PBA exposures. See Note 3, Outstanding Exposure. Gross Premium Receivable, Net of Commissions Payable on Assumed Business Roll Forward Nine Months 2023 2022 (in millions) Beginning of year $ 1,298 $ 1,372 Less: Specialty insurance premium receivable 1 1 Financial guaranty insurance premiums receivable 1,297 1,371 Gross written premiums on new business, net of commissions 215 232 Gross premiums received, net of commissions (170) (258) Adjustments: Changes in the expected term and debt service assumptions 4 (5) Accretion of discount, net of commissions on assumed business 20 18 Foreign exchange gain (loss) on remeasurement 9 (181) Financial guaranty insurance premium receivable 1,375 1,177 Specialty insurance premium receivable 1 1 September 30, $ 1,376 $ 1,178 Approximately 70% and 74% of gross premiums receivable, net of commissions payable, at September 30, 2023 and December 31, 2022, respectively, are denominated in currencies other than the U.S. dollar, primarily the pound sterling and euro. The timing and cumulative amount of actual collections and net earned premiums may differ from those of expected collections and of expected net earned premiums in the table below due to factors such as foreign exchange rate fluctuations, counterparty collectability issues, accelerations, commutations, restructurings, changes in the consumer price indices, changes in expected lives and new business. Financial Guaranty Insurance Expected Future Premium Collections and Earnings As of September 30, 2023 Future Gross Premiums Future Net Premiums (in millions) 2023 (October 1 - December 31) $ 45 $ 72 2024 134 277 2025 104 259 2026 100 243 2027 97 230 2028-2032 402 958 2033-2037 264 635 2038-2042 182 390 After 2042 360 537 Total $ 1,688 3,601 Future accretion 313 Total future net earned premiums $ 3,914 ____________________ (1) Net of assumed commissions payable. (2) Net of reinsurance. Selected Information for Financial Guaranty Insurance Policies with Premiums Paid in Installments As of September 30, 2023 December 31, 2022 (dollars in millions) Premiums receivable, net of commissions payable $ 1,375 $ 1,297 Deferred premium revenue 1,702 1,663 Weighted-average risk-free rate used to discount premiums 1.9% 1.8% Weighted-average period of premiums receivable (in years) 12.2 12.9 Losses and Recoveries Loss reserves and salvage are discounted at risk-free rates for U.S. dollar denominated financial guaranty insurance obligations that ranged from 4.51% to 5.45% with a weighted average of 4.86% as of September 30, 2023 and 3.82% to 4.69% with a weighted average of 4.15% as of December 31, 2022. The following tables provide information on net reserve (salvage), which includes loss and LAE reserves and salvage and subrogation recoverable, both net of reinsurance. Net Reserve (Salvage) by Sector As of Sector September 30, 2023 December 31, 2022 (in millions) Public finance: U.S. public finance $ 123 $ 71 Non-U.S. public finance 1 1 Public finance 124 72 Structured finance: U.S. RMBS (89) (77) Other structured finance 42 42 Structured finance (47) (35) Total $ 77 $ 37 The table below provides a reconciliation of net expected loss to be paid (recovered) for financial guaranty insurance contracts to net expected loss to be expensed. Expected loss to be paid (recovered) for financial guaranty insurance contracts differs from expected loss to be expensed due to: (i) the contra-paid, which represents the claim payments made and recoveries received that have not yet been recognized in the statements of operations; (ii) salvage and subrogation recoverable for transactions that are in a net recovery position where the Company has not yet received recoveries on claims previously paid (and therefore recognized in income but not yet received); and (iii) loss reserves that have already been established (and therefore expensed but not yet paid). Reconciliation of Net Expected Loss to be Paid (Recovered) to Net Expected Loss to be Expensed Financial Guaranty Insurance Contracts As of September 30, 2023 (in millions) Net expected loss to be paid (recovered) - financial guaranty insurance $ 249 Contra-paid, net 21 Salvage and subrogation recoverable, net 281 Loss and LAE reserve - financial guaranty insurance contracts, net of reinsurance (355) Net expected loss to be expensed (present value) $ 196 The following table provides a schedule of the expected timing of net expected losses to be expensed. The amount and timing of actual loss and LAE may differ from the estimates shown below due to factors such as accelerations, commutations, changes in expected lives and updates to loss estimates. This table excludes amounts related to FG VIEs, which are eliminated in consolidation. Net Expected Loss to be Expensed Financial Guaranty Insurance Contracts As of September 30, 2023 (in millions) 2023 (October 1 - December 31) $ 2 2024 13 2025 12 2026 15 2027 16 2028-2032 63 2033-2037 49 2038-2042 13 After 2042 13 Net expected loss to be expensed 196 Future accretion 39 Total expected future loss and LAE $ 235 The following table presents the loss and LAE (benefit) reported in the condensed consolidated statements of operations by sector for insurance contracts. Amounts presented are net of reinsurance. Loss and LAE (Benefit) by Sector Third Quarter Nine Months Sector 2023 2022 2023 2022 (in millions) Public finance: U.S. public finance $ 134 $ 1 $ 186 $ 67 Non-U.S. public finance — — — — Public finance 134 1 186 67 Structured finance: U.S. RMBS (35) (78) $ (31) $ (97) Other structured finance 1 2 4 1 Structured finance (34) (76) (27) (96) Loss and LAE (benefit) $ 100 $ (75) $ 159 $ (29) The following tables provide information on financial guaranty insurance contracts categorized as BIG. Financial Guaranty Insurance BIG Transaction Loss Summary As of September 30, 2023 Gross Net Total BIG BIG 1 BIG 2 BIG 3 Total BIG (dollars in millions) Number of risks (1) 102 13 109 224 224 Remaining weighted-average period (in years) 9.8 16.1 7.7 10.2 10.2 Outstanding exposure: Par $ 2,121 $ 980 $ 2,033 $ 5,134 $ 5,119 Interest 1,125 922 824 2,871 2,867 Total (2) $ 3,246 $ 1,902 $ 2,857 $ 8,005 $ 7,986 Expected cash outflows (inflows) $ 113 $ 180 $ 1,621 $ 1,914 $ 1,903 Potential recoveries (3) (324) (78) (1,223) (1,625) (1,615) Subtotal (211) 102 398 289 288 Discount 60 (25) (74) (39) (39) Expected losses to be paid (recovered) $ (151) $ 77 $ 324 $ 250 $ 249 Deferred premium revenue $ 96 $ 64 $ 146 $ 306 $ 306 Reserves (salvage) $ (178) $ 37 $ 215 $ 74 $ 74 Financial Guaranty Insurance BIG Transaction Loss Summary As of December 31, 2022 Gross Net Total BIG BIG 1 BIG 2 BIG 3 Total BIG (dollars in millions) Number of risks (1) 122 14 111 247 247 Remaining weighted-average period (in years) 11.3 8.7 7.6 9.8 9.8 Outstanding exposure: Par $ 3,363 $ 171 $ 2,318 $ 5,852 $ 5,835 Interest 2,177 77 894 3,148 3,144 Total (2) $ 5,540 $ 248 $ 3,212 $ 9,000 $ 8,979 Expected cash outflows (inflows) $ 128 $ 121 $ 1,771 $ 2,020 $ 2,008 Potential recoveries (3) (294) (79) (1,364) (1,737) (1,725) Subtotal (166) 42 407 283 283 Discount 35 (13) (104) (82) (82) Expected losses to be paid (recovered) $ (131) $ 29 $ 303 $ 201 $ 201 Deferred premium revenue $ 170 $ 15 $ 160 $ 345 $ 345 Reserves (salvage) $ (174) $ 21 $ 186 $ 33 $ 33 ____________________ (1) A risk represents the aggregate of the financial guaranty policies that share the same revenue source for purposes of making debt service payments. (2) Includes amounts related to FG VIEs. (3) Represents expected inflows from future payments by obligors pursuant to restructuring agreements, settlements, excess spread on any underlying collateral and other estimated recoveries. Potential recoveries also include recoveries on certain investment grade credits, related mainly to exposures that were previously BIG and for which claims have been paid in the past.

Contracts Accounted for as Cred

Contracts Accounted for as Credit Derivatives	9 Months Ended
	Sep. 30, 2023
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Contracts Accounted for as Credit Derivatives	Contracts Accounted for as Credit Derivatives Amounts presented in this note relate only to contracts accounted for as derivatives. The Company’s credit derivatives (contracts that meet the definition of a derivative in accordance with GAAP) are primarily CDS and also include interest rate swaps. The Company’s credit derivatives are generally governed by International Swaps and Derivatives Association, Inc. documentation and have certain characteristics that differ from financial guaranty insurance contracts. For example, the Company’s control rights with respect to a reference obligation under a CDS may be more limited than when the Company issues a financial guaranty insurance contract. In addition, there are more circumstances under which the Company may be obligated to make payments. Similar to a financial guaranty insurance contract, the Company would be obligated to pay if the obligor failed to make a scheduled payment of principal or interest in full. In certain credit derivative transactions, the Company also specifically agreed to pay if the obligor were to become bankrupt or if the reference obligation were restructured. Furthermore, in certain credit derivative transactions, the Company may be required to make a payment due to an event that is unrelated to the performance of the obligation referenced in the credit derivative. If events of default or termination events specified in the credit derivative documentation were to occur, the non-defaulting or the non-affected party, which may be either the Company or the counterparty, depending upon the circumstances, may decide to terminate a credit derivative prior to maturity. In that case, the Company may be required to make a termination payment to its swap counterparty upon such termination. Absent such an event of default or termination event, the Company may not unilaterally terminate a credit derivative contract; however, the Company on occasion has mutually agreed with various counterparties to terminate certain CDS transactions. The components of the Company’s credit derivative net par outstanding by sector are presented in the table below. The estimated remaining weighted average life of credit derivatives was 11.4 years and 12.8 years as of September 30, 2023 and December 31, 2022, respectively. Credit Derivatives (1) As of September 30, 2023 As of December 31, 2022 Sector Net Par Net Fair Value Asset (Liability) Net Par Net Fair Value Asset (Liability) (in millions) U.S. public finance $ 1,074 $ (15) $ 1,175 $ (79) Non-U.S. public finance 1,478 (19) 1,565 (58) U.S. structured finance 327 (13) 342 (22) Non-U.S. structured finance 610 (2) 121 (3) Total $ 3,489 $ (49) $ 3,203 $ (162) ____________________ (1) Expected loss to be paid was $3 million as of both September 30, 2023 and December 31, 2022. Distribution of Credit Derivative Net Par Outstanding by Internal Rating As of September 30, 2023 As of December 31, 2022 Rating Category Net Par % of Total Net Par % of Total (dollars in millions) AAA $ 1,255 36.0 % $ 1,260 39.3 % AA 1,020 29.2 1,064 33.2 A 689 19.7 232 7.2 BBB 470 13.5 590 18.5 BIG 55 1.6 57 1.8 Credit derivative net par outstanding $ 3,489 100.0 % $ 3,203 100.0 % Fair Value Gains (Losses) on Credit Derivatives Third Quarter Nine Months 2023 2022 2023 2022 (in millions) Realized gains (losses) and other settlements $ — $ (1) $ 1 $ (2) Net unrealized gains (losses) 9 (47) 114 (40) Fair value gains (losses) on credit derivatives $ 9 $ (48) $ 115 $ (42) The impact of changes in credit spreads will vary based upon the volume, tenor, interest rates and other market conditions at the time these fair values are determined. In addition, since each transaction has unique collateral and structural terms, the change in fair value of each transaction may vary considerably. The fair value of credit derivative contracts generally also reflects the Company’s own credit cost based on the price to purchase credit protection on AGC. The Company determines its own credit risk primarily based on quoted CDS prices traded on AGC at each balance sheet date. CDS Spread on AGC (in basis points) As of September 30, As of December 31, 2022 As of September 30, As of December 31, 2021 Five-year CDS spread 98 63 70 49 One-year CDS spread 41 26 28 16 Fair Value of Credit Derivative Assets (Liabilities) and Effect of AGC Credit Spread As of September 30, 2023 December 31, 2022 (in millions) Fair value of credit derivatives before effect of AGC credit spread $ (80) $ (207) Plus: Effect of AGC credit spread 31 45 Net fair value of credit derivatives $ (49) $ (162) The fair value of CDS contracts as of September 30, 2023, before considering the benefit applicable to AGC’s credit spread, is a direct result of the relatively wider credit spreads under current market conditions compared to those at the time of underwriting for certain underlying credits with longer tenor.

Investments

Investments	9 Months Ended
	Sep. 30, 2023
Investments, Debt and Equity Securities [Abstract]
Investments	Investments The majority of the investment portfolio comprises investment grade fixed-maturity securities managed by three outside managers. The Company has established investment guidelines for these investment managers regarding credit quality, exposure to a particular sector and exposure to a particular obligor within a sector. The remainder of the investment portfolio primarily consists of (i) Loss Mitigation Securities; (ii) New Recovery Bonds and CVIs received in connection with the consummation of the 2022 Puerto Rico Resolutions; (iii) equity method investments; (iv) short-term investments and (iv) other investments. Equity method investments primarily consists of the investment in Sound Point and fund investments across a variety of strategies. Investment Portfolio Carrying Value As of September 30, 2023 December 31, 2022 (in millions) Fixed-maturity securities, available-for-sale (1): Externally managed (2) $ 5,316 $ 5,824 Loss Mitigation Securities 495 548 Puerto Rico, New Recovery Bonds (3) 78 358 Other (4) 378 389 Fixed-maturity securities, trading - Puerto Rico, CVIs (3) 350 303 Short-term investments 1,426 810 Other invested assets: Equity method investments: Sound Point 419 — Alternative investments (5) 331 123 Other 15 10 Total $ 8,808 $ 8,365 ____________________ (1) 7.6% and 7.4% of fixed-maturity securities were rated BIG as of September 30, 2023 and December 31, 2022, respectively, consisting primarily of Loss Mitigation Securities. 2.4% and 5.9% were not rated, as of September 30, 2023 and December 31, 2022, respectively. (2) As of September 30, 2023 and December 31, 2022 amounts include $294 million and $305 million, respectively, of CLOs that had been managed internally by AssuredIM under an investment management agreement until it transitioned to an external manager in June 2023. (3) These securities are not rated. On August 31, 2023, the Company satisfied its obligations under certain Puerto Rico Trusts and as a result $68 million, at fair value, of Puerto Rico New Recovery Bonds and $5 million, at fair value, of CVIs were transferred from the consolidated Puerto Rico Trusts to AGC and AGM’s investment portfolios. See Note 3, Outstanding Exposure. (4) As of September 30, 2023 and December 31, 2022, amounts include $214 million and $232 million, respectively, of municipal bonds that had been managed by AssuredIM under an investment management agreement until June 2023, and are now managed by the U.S. Insurance Subsidiaries for their own accounts. (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. Upon closing of the Sound Point Transaction and the AHP Transaction in July, the Company has increased the aggregate amount it has agreed to invest in alternative investments to $1.5 billion, including the $1 billion with Sound Point, subject to regulatory approval, which includes $630 million of invested capital (at fair value), and $890 million in unfunded commitments (of which $332 million is committed to specific funds). See Note 1, Business and Basis of Presentation for a description of the Sound Point Transaction. Of the $1.5 billion mentioned above, the U.S. Insurance Subsidiaries through their jointly owned investment subsidiary, AGAS, are authorized to invest up to $750 million plus previously distributed gains of $132 million for a total of $882 million as of September 30, 2023. As of September 30, 2023, AGAS commitments to Sound Point and AHP funds were $703 million (of which $446 million was funded with a net asset value (NAV) of $469 million). This capital was committed to several funds, each dedicated to a single strategy, including CLOs, asset-based finance and healthcare structured capital. As of September 30, 2023, three of the six funds in which AGAS invests are accounted for as CIVs. See Note 8, Financial Guaranty Variable Interest Entities and Consolidated Investment Vehicles. Accrued investment income, which is reported in “other assets,” was $78 million as of September 30, 2023 and $71 million as of December 31, 2022. In nine months 2023 and nine months 2022, the Company did not write off any accrued investment income. Available-for-Sale Fixed-Maturity Securities by Security Type As of September 30, 2023 Security Type Percent Amortized Allowance for Credit Losses Gross Gross Estimated (dollars in millions) Obligations of state and political subdivisions 42 % $ 2,938 $ (14) $ 20 $ (178) $ 2,766 U.S. government and agencies 1 65 — — (7) 58 Corporate securities (2) 33 2,321 (6) 1 (307) 2,009 Mortgage-backed securities (3): RMBS 6 430 (20) 2 (82) 330 Commercial mortgage-backed securities (CMBS) 3 198 — — (10) 188 Asset-backed securities: CLOs 7 463 — 1 (10) 454 Other 6 440 (46) 6 (31) 369 Non-U.S. government securities 2 116 — — (23) 93 Total available-for-sale fixed-maturity securities 100 % $ 6,971 $ (86) $ 30 $ (648) $ 6,267 Available-for-Sale Fixed-Maturity Securities by Security Type As of December 31, 2022 Security Type Percent Amortized Allowance for Credit Losses Gross Gross Estimated (dollars in millions) Obligations of state and political subdivisions 45 % $ 3,509 $ (14) $ 37 $ (138) $ 3,394 U.S. government and agencies 2 118 — 1 (8) 111 Corporate securities (2) 31 2,387 (6) 2 (299) 2,084 Mortgage-backed securities (3): RMBS 5 418 (19) 3 (62) 340 CMBS 4 282 — — (11) 271 Asset-backed securities: CLOs 6 449 — — (21) 428 Other 5 423 (26) 22 (26) 393 Non-U.S. government securities 2 121 — — (23) 98 Total available-for-sale fixed-maturity securities 100 % $ 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 38% and 30% of mortgage-backed securities as of September 30, 2023 and December 31, 2022, respectively, 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 September 30, 2023 Less than 12 months 12 months or more Total Fair Gross Unrealized Fair Gross Unrealized Fair Gross Unrealized (dollars in millions) Obligations of state and political subdivisions $ 1,610 $ (39) $ 899 $ (136) $ 2,509 $ (175) U.S. government and agencies 21 — 32 (7) 53 (7) Corporate securities 381 (14) 1,396 (236) 1,777 (250) Mortgage-backed securities: RMBS 55 (3) 122 (14) 177 (17) CMBS 3 — 184 (10) 187 (10) Asset-backed securities: CLOs 18 (2) 402 (8) 420 (10) Other 1 — 26 (2) 27 (2) Non-U.S. government securities 4 — 89 (23) 93 (23) Total $ 2,093 $ (58) $ 3,150 $ (436) $ 5,243 $ (494) Number of securities (1) 795 1,308 2,079 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 months 12 months or more Total Fair Gross Unrealized Fair Gross Unrealized Fair Gross Unrealized (dollars in millions) Obligations of state and political subdivisions $ 1,763 $ (79) $ 163 $ (56) $ 1,926 $ (135) U.S. government and agencies 32 — 52 (8) 84 (8) Corporate securities 1,276 (95) 519 (147) 1,795 (242) Mortgage-backed securities: RMBS 147 (9) 3 (1) 150 (10) CMBS 270 (11) — — 270 (11) Asset-backed securities: CLOs 171 (7) 250 (14) 421 (21) Other 27 (2) — — 27 (2) Non-U.S. government securities 65 (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. The Company considered the credit quality, cash flows, interest rate movements, ability to hold a security to recovery and intent to sell a security in determining whether a security had a credit loss. The Company has determined that the unrealized losses recorded as of September 30, 2023 and December 31, 2022 were primarily related to higher interest rates rather than credit quality. As of September 30, 2023, the Company did not intend to and was not required to sell investments in an unrealized loss position prior to expected recovery in value. As of September 30, 2023, of the securities in an unrealized loss position for which an allowance for credit loss was not recorded, 641 securities had unrealized losses in excess of 10% of their carrying value, whereas as of December 31, 2022, 567 securities had unrealized losses in excess of 10% of their carrying value. The total unrealized loss for these securities was $351 million as of September 30, 2023 and $329 million as of December 31, 2022. The amortized cost and estimated fair value of available-for-sale fixed-maturity securities by contractual maturity as of September 30, 2023 are shown below. Expected maturities will differ from contractual maturities because borrowers may have the right to call or prepay obligations with or without call or prepayment penalties. Distribution of Available-for-Sale Fixed-Maturity Securities by Contractual Maturity As of September 30, 2023 Amortized Estimated (in millions) Due within one year $ 248 $ 239 Due after one year through five years 1,526 1,406 Due after five years through 10 years 1,760 1,629 Due after 10 years 2,809 2,475 Mortgage-backed securities: RMBS 430 330 CMBS 198 188 Total $ 6,971 $ 6,267 Based on fair value, investments and other assets that are either held in trust for the benefit of third-party ceding insurers in accordance with statutory requirements, placed on deposit to fulfill state licensing requirements, or otherwise pledged or restricted, totaled $224 million as of September 30, 2023 and $222 million as of December 31, 2022. The investment portfolio also contains securities that are held in trust by certain AGL subsidiaries or are otherwise restricted for the benefit of other AGL subsidiaries in accordance with statutory and regulatory requirements in the amounts of $1,107 million and $1,169 million based on fair value as of September 30, 2023 and December 31, 2022, respectively. Income from Investments Net investment income is a function of the yield that the Company earns on available-for-sale fixed-maturity securities and short-term investments, and the size of such portfolio. The investment yield is a function of market interest rates at the time of investment as well as the type, credit quality and maturity of the securities in this portfolio. Puerto Rico CVIs in the investment portfolio are classified as trading securities. Equity in earnings (losses) of investees represents the Company’s interest in the earnings of its equity method investments. Income from Investments Third Quarter Nine Months 2023 2022 2023 2022 (in millions) Investment income: Fixed-maturity securities, available-for-sale: Externally managed (1) $ 51 $ 50 $ 156 $ 150 Loss Mitigation Securities 24 9 46 24 Puerto Rico, New Recovery Bonds 1 1 5 5 Other (2) 5 4 12 11 Short-term investments 21 4 53 5 Other invested assets — — 2 — Investment income 102 68 274 195 Investment expenses (2) (1) (4) (4) Net investment income $ 100 $ 67 $ 270 $ 191 Fair value gains (losses) on trading securities (3) $ 4 $ (8) $ 42 $ (30) Equity in earnings (losses) of investees (4) 18 (20) 25 (31) ____________________ (1) Amounts for 2022 include income on the portion of the CLO portfolio that was previously managed by AssuredIM. (2) Amounts for 2022 include income on the portion of the municipal bond portfolio that was previously managed by AssuredIM. (3) Fair value gains on trading securities pertaining to securities still held as of September 30, 2023 were $4 million for third quarter 2023 and $42 million for nine months 2023. Fair value losses on trading securities pertaining to securities still held as of September 30, 2022 were $2 million for third quarter 2022 and $18 million for nine months 2022. (4) Beginning in the fourth quarter of 2023, equity in earnings (losses) will include the Company’s share of the earnings of the Sound Point entities, which is reported on a one-quarter lag. Realized Investment Gains (Losses) The table below presents the components of net realized investment gains (losses). Realized gains and losses on sales of investments are determined using the specific identification method. Net Realized Investment Gains (Losses) Third Quarter Nine Months 2023 2022 2023 2022 (in millions) Gross realized gains on sales of available-for-sale securities (1) $ 2 $ — $ 21 $ — Gross realized losses on sales of available-for-sale securities (1) (1) (10) (16) (33) Net foreign currency gains (losses) (1) — (1) (3) Change in allowance for credit losses and intent to sell (8) (4) (23) (13) Other net realized gains (losses) (1) — (1) 10 Net realized investment gains (losses) $ (9) $ (14) $ (20) $ (39) ____________________ (1) Gross realized gains and losses on sales in all periods related primarily to sales of New Recovery Bonds received as part of the 2022 Puerto Rico Resolutions. The proceeds from sales of fixed-maturity securities classified as available-for-sale were $73 million in third quarter 2023, $207 million in third quarter 2022, $767 million in nine months 2023 and $560 million in nine months 2022. 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 Third Quarter Nine Months 2023 2022 2023 2022 (in millions) Balance, beginning of period $ 79 $ 51 $ 65 $ 42 Additions for securities for which credit losses were not previously recognized — 1 — 4 Additions for purchases of securities accounted for as purchased financial assets with credit deterioration — 2 — 2 Additions (reductions) for securities for which credit losses were previously recognized 7 3 21 9 Balance, end of period $ 86 $ 57 $ 86 $ 57 During third quarter 2022, the Company purchased a loss mitigation security with a fair value of $22 million that was accounted for as a purchased security with credit deterioration. At acquisition, this security had an unpaid principal on remaining collateral of $31 million, an allowance for credit losses of $2 million, and a non-credit related discount of $7 million. The Company did not purchase any securities with credit deterioration during third quarter 2023 and nine months 2023. Most of the Company’s securities with credit deterioration are Loss Mitigation Securities.

Financial Guaranty Variable Int

Financial Guaranty Variable Interest Entities and Consolidated Investment Vehicles	9 Months Ended
	Sep. 30, 2023
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Financial Guaranty Variable Interest Entities and Consolidated Investment Vehicles	Financial Guaranty Variable Interest Entities and Consolidated Investment Vehicles FG VIEs Structured Finance and Other FG VIEs The insurance subsidiaries provide financial guaranties with respect to debt obligations of special purpose entities, including VIEs, but do not act as the servicer or collateral manager for any VIE obligations they guarantee. The transaction structure generally provides certain financial protection to the insurance subsidiaries. This financial protection can take several forms, the most common of which are overcollateralization, first loss protection (or subordination) and excess spread. In the case of overcollateralization (i.e., the principal amount of the securitized assets exceeds the principal amount of the structured finance obligations), the structure allows defaults of the securitized assets before a default is experienced on the structured finance obligation guaranteed by the insurance subsidiaries. In the case of first loss, the insurance subsidiaries’ financial guaranty insurance policy only covers a senior layer of losses experienced by multiple obligations issued by the VIEs. The first loss exposure with respect to the assets is either retained by the seller or sold off in the form of equity or mezzanine debt to other investors. In the case of excess spread, the financial assets contributed to VIEs generate interest income that is in excess of the interest payments on the debt issued by the VIE. Such excess spread is typically distributed through the transaction’s cash flow waterfall and may be used to create additional credit enhancement, applied to redeem debt issued by the VIE (thereby, creating additional overcollateralization), or distributed to equity or other investors in the transaction. The insurance subsidiaries are not primarily liable for the debt obligations issued by the structured finance and other FG VIEs (which excludes the Puerto Rico Trusts described below) they insure and would only be required to make payments on those insured debt obligations in the event that the issuer of such debt obligations defaults on any principal or interest due and only for the amount of the shortfall. AGL’s and its insurance subsidiaries’ creditors do not have any rights with regard to the collateral supporting the debt issued by the structured finance and other FG VIEs. Proceeds from sales, maturities, prepayments and interest from such underlying collateral may only be used to pay debt service on structured finance and other FG VIEs’ liabilities. As part of the terms of its financial guaranty contracts, the insurance subsidiaries obtain certain protective rights with respect to the VIE that give them additional controls over a VIE. These protective rights are triggered by the occurrence of certain events, such as failure to be in compliance with a covenant due to poor deal performance or a deterioration in a servicer or collateral manager’s financial condition. At deal inception, the insurance subsidiaries typically are not deemed to control the VIE; however, once a trigger event occurs, the insurance subsidiaries’ control of the VIE typically increases. The Company continuously evaluates its power to direct the activities that most significantly impact the economic performance of VIEs that have debt obligations insured by the insurance subsidiaries and, accordingly, where they are obligated to absorb VIE losses or receive benefits that could potentially be significant to the VIE. The insurance subsidiaries are deemed to be the control party for certain VIEs under GAAP, typically when their protective rights give them the power to both terminate and replace the transaction’s servicer or collateral manager, which are characteristics specific to the Company’s financial guaranty contracts. If the protective rights that could make the insurance subsidiaries the control party have not been triggered, then the VIE is not consolidated. If the insurance subsidiaries are deemed to no longer have those protective rights, the VIE is deconsolidated. The structured finance and other FG VIEs’ liabilities that are guaranteed by the insurance subsidiaries are considered to be with recourse, because the insurance subsidiaries guarantee the payment of principal and interest regardless of the performance of the related FG VIEs’ assets. The structured finance and other FG VIEs’ liabilities that are not guaranteed by the insurance subsidiaries are considered to be without recourse, because the payment of principal and interest of these liabilities is wholly dependent on the performance of the FG VIEs’ assets. The Company has elected the FVO for all assets and all liabilities of the structured finance and other FG VIEs. The change in fair value of all structured finance and other FG VIEs’ assets and liabilities is reported in “fair value gains (losses) on FG VIEs” in the condensed consolidated statement of operations, except for the change in fair value attributable to change in instrument-specific credit risk (ISCR) on the structured finance and other FG VIEs’ liabilities, which is reported in other comprehensive income (OCI). As of both September 30, 2023 and December 31, 2022, the Company consolidated 25 structured finance and other FG VIEs. Puerto Rico Trusts With respect to certain insured securities covered by the 2022 Puerto Rico Resolutions, insured bondholders were permitted to elect to receive custody receipts that represent an interest in the legacy insurance policy plus cash, New Recovery Bonds and/or CVIs that constitute distributions under the 2022 Puerto Rico Resolutions. (At least one separate custodial trust was set up for each legacy insured bond, and the trusts are deconsolidated as they are paid off.) For those who made this election, distributions of Plan Consideration are immediately passed through to insured bondholders under the custody receipts to the extent of any cash or proceeds of new securities held in the custodial trust and are applied to make payments and/or prepayments of amounts due under the legacy insured bonds. The Company’s insurance policy continues to guarantee principal and interest coming due on the legacy insured bonds in accordance with the terms of such insurance policy on the originally scheduled legacy bond interest and principal payment dates to the extent that distributions of Plan Consideration are insufficient to pay or prepay such amounts after giving effect to the distributions described in the immediately preceding sentence. In the case of insured bondholders who elected to receive custody receipts, the Company retains the right to satisfy its obligations under the insurance policy with respect to the related legacy insured bonds at any time thereafter, with 30 days’ notice, by paying 100% of the then outstanding principal amount of insured bonds plus accrued interest. On August 31, 2023, after notice to certain holders of custody receipts representing interests in legacy insured GO, PBA and HTA bonds, the Company satisfied its obligations under such legacy insured bonds with respect to $108 million net par outstanding as of August 31, 2023, and the custodial trusts released to AGC and AGM New Recovery Bonds and/or CVIs with a fair value totaling $73 million as of August 31, 2023. As of September 30, 2023 and December 31, 2022, respectively, the Company consolidated 24 and 45 custodial trusts established as part of the 2022 Puerto Rico Resolutions discussed in Note 3, Outstanding Exposure, Exposure to Puerto Rico. New Recovery Bonds Reported in FG VIEs’ Assets Available-for-Sale Amortized Gross Gross Estimated (dollars in millions) As of September 30, 2023 $ 136 $ 10 $ — $ 146 As of December 31, 2022 204 4 (4) 204 As of September 30, 2023, no New Recovery Bonds in the Puerto Rico Trusts were in a gross unrealized loss position. As of December 31, 2022, 14 New Recovery Bonds in the Puerto Rico Trusts were in a gross unrealized loss position totaling $4 million and had a fair value of $110 million, all of which were in a continuous unrealized loss position for less than 12 months. The Company considered the credit quality, cash flows, interest rate movements, ability to hold a security to recovery and intent to sell a security in determining whether a security had a credit loss. The Company has determined that the unrealized losses recorded as of December 31, 2022 were primarily attributable to the change in interest rates, rather than credit quality. The Company did not intend to and was not required to sell these investments prior to an expected recovery in value. As of December 31, 2022, of the securities in an unrealized loss position for which an allowance for credit loss was not recorded, eight securities had unrealized losses in excess of 10% of their carrying value. The total unrealized loss for these securities was $3 million. The amortized cost and estimated fair value of available-for-sale New Recovery Bonds by contractual maturity as of September 30, 2023 are shown below. Expected maturities will differ from contractual maturities because borrowers may have the right to call or prepay obligations with or without call or prepayment penalties. New Recovery Bonds, Available-for-Sale Reported in FG VIEs’ Assets Distribution by Contractual Maturity As of September 30, 2023 Amortized Estimated (in millions) Due after five years through 10 years $ 28 $ 30 Due after 10 years 108 116 Total $ 136 $ 146 Components of FG VIEs’ Assets and Liabilities Net fair value gains and losses on FG VIEs are expected to reverse to zero by the maturity of the FG VIEs’ debt, except for net premiums received and net claims paid by the insurance subsidiaries under the financial guaranty insurance contracts. The Company’s estimate of expected loss to be paid (recovered) for FG VIEs is included in Note 4, Expected Loss to be Paid (Recovered). The table below shows the carrying value of FG VIEs’ assets and liabilities segregated by type of collateral. Consolidated FG VIEs by Type of Collateral As of September 30, 2023 December 31, 2022 (in millions) FG VIEs’ assets: U.S. RMBS first lien $ 146 $ 167 U.S. RMBS second lien 27 30 Puerto Rico Trusts’ assets (includes $146 and $209 at fair value) (1) 147 212 Other 7 7 Total FG VIEs’ assets $ 327 $ 416 FG VIEs’ liabilities with recourse: U.S. RMBS first lien $ 156 $ 176 U.S. RMBS second lien 20 24 Puerto Rico Trusts’ liabilities 347 495 Other 8 7 Total FG VIEs’ liabilities with recourse $ 531 $ 702 FG VIEs’ liabilities without recourse: U.S. RMBS first lien $ 11 $ 13 Total FG VIEs’ liabilities without recourse $ 11 $ 13 ____________________ (1) Includes $2 million of cash as of December 31, 2022. The change in the ISCR of the FG VIEs’ assets for which the Company elected the FVO (FG VIEs’ assets at FVO) held as of September 30, 2023 that was reported in the condensed consolidated statements of operations for third quarter 2023 and nine months 2023 were gains of $3 million and $1 million, respectively. The change in the ISCR of the FG VIEs’ assets at FVO held as of September 30, 2022 were gains of $15 million and $11 million for third quarter 2022 and nine months 2022, respectively. The ISCR amount is determined by using expected cash flows at the original date of consolidation, discounted at the effective yield, less current expected cash flows discounted at that same original effective yield. The inception-to-date change in fair value of the FG VIEs’ liabilities with recourse (all of which are measured at fair value under the FVO) attributable to the ISCR is calculated by holding all current period assumptions constant for each security and isolating the effect of the change in the insurance subsidiaries’ CDS spread from the most recent date of consolidation to the current period. Selected Information for FG VIEs’ Assets and Liabilities Measured under the FVO As of September 30, 2023 December 31, 2022 (in millions) Excess of unpaid principal over fair value of: FG VIEs’ assets $ 266 $ 265 FG VIEs’ liabilities with recourse 51 21 FG VIEs’ liabilities without recourse 16 15 Unpaid principal balance for FG VIEs’ assets that were 90 days or more past due 29 34 Unpaid principal for FG VIEs’ liabilities with recourse (1) 582 723 ____________________ (1) FG VIEs’ liabilities with recourse will mature at various dates ranging from 2023 through 2041. CIVs In connection with the Sound Point Transaction and AHP Transaction the Company reevaluated its consolidation conclusion for each CIV and deconsolidated all but three CIVs. As of September 30, 2023, CIVs consist of certain funds managed by Sound Point, that were previously managed by AssuredIM. The Company consolidates investment vehicles when it is deemed to be the primary beneficiary, based on its power to direct the most significant activities of each VIE and its level of economic interest in the entities. As a result of the Sound Point Transaction and AHP Transaction, during third quarter 2023 and nine months 2023, the Company deconsolidated CIV assets of $4.7 billion and CIV liabilities of $4.4 billion. The Company recognized a loss on deconsolidation of $16 million, which is reported in “fair value gains (losses) on CIVs”. During nine months 2022, the Company deconsolidated a CLO with assets and liabilities of $417 million. The assets and liabilities of the Company’s CIVs are held within separate legal entities. The assets of the CIVs are not available to creditors of the Company, other than creditors of the applicable CIVs. In addition, creditors of the CIVs have no recourse against the assets of the Company, other than the assets of such applicable CIVs. Liquidity available at the Company’s CIVs is not available for corporate liquidity needs, except to the extent of the Company’s investment in the funds, subject to redemption provisions. Changes in the fair value of assets and liabilities of CIVs, interest income and expense, and gains and losses on consolidation and deconsolidation of CIVs are reported in “fair value gains (losses) on CIVs” in the condensed consolidated statements of operations. Interest income from CLO assets is recorded based on contractual rates. Number of Consolidated CIVs by Type As of CIV Type September 30, 2023 December 31, 2022 Funds 3 8 CLOs — 10 CLO warehouses — 4 Total number of consolidated CIVs (1) 3 22 ____________________ (1) As of December 31, 2022, two CIVs were voting interest entities (VOEs). Funds meet the criteria for consolidating a VOE when the Company possesses substantially all of the economics and all of the decision-making authority. Assets and Liabilities of CIVs As of September 30, 2023 December 31, 2022 (in millions) Assets: Fund assets: Cash and cash equivalents $ 7 $ 59 Fund investments, at fair value Equity securities and warrants 79 434 Structured products 239 128 Corporate securities — 96 Other 5 1 CLO and CLO warehouse assets: Cash — 38 CLO investments: Loans in CLOs and CLO warehouses, FVO — 4,570 Short-term investments, at fair value — 135 Due from brokers and counterparties — 32 Total assets (1) $ 330 $ 5,493 Liabilities: CLO obligations, FVO (2) — 4,090 Warehouse financing debt, FVO (3) — 313 Due to brokers and counterparties 4 112 Other liabilities (4) — 110 Total liabilities $ 4 $ 4,625 ____________________ (1) Includes investments in AssuredIM funds and other affiliated entities of $392 million as of December 31, 2022. Includes assets and liabilities of a VOE of $58 million and $1 million, respectively, as of December 31, 2022. (2) As of December 31, 2022, the weighted average maturity of CLO obligations was 6.2 years and the weighted average interest rate of CLO obligations was 5.3%. (3) The weighted average maturity of warehouse financing debt of CLO warehouses was 1.9 years as of December 31, 2022. The weighted average interest rate of warehouse financing debt of CLO warehouses was 4.5% as of December 31, 2022. (4) As of December 31, 2022, includes redeemable noncontrolling interests (NCI). As of September 30, 2023, the CIVs had unfunded commitments to invest of $143 million. As of September 30, 2023 and December 31, 2022, the CIVs included derivative contracts with notional amounts totaling $36 million and $46 million, respectively, and average notional amounts of $41 million and $47 million, respectively. The fair value of derivative contracts is reported in the “assets of CIVs” or “liabilities of CIVs” in the condensed consolidated balance sheets. The net change in fair value is reported in “fair value gains (losses) on CIVs” in the condensed consolidated statements of operations. The net change in fair value of derivative contracts were gains of $7 million for nine months 2022. NCI in CIVs NCI represents the proportion of the consolidated funds not owned by the Company and includes ownership interests of third parties, employees, and former employees. The NCI is non-redeemable and presented on the statement of shareholders’ equity. Other Consolidated VIEs In certain instances where the Company consolidates a VIE that was established as part of a loss mitigation negotiated settlement that results in the termination of the obligations under the original financial guaranty insurance or insured credit derivative contract, the Company classifies the assets and liabilities of that VIE in the line items that most accurately reflect the nature of such assets and liabilities, as opposed to within FG VIEs’ assets and FG VIEs’ liabilities. The largest of these VIEs had assets of $87 million and liabilities of $7 million as of September 30, 2023, and assets of $86 million and liabilities of $12 million as of December 31, 2022, primarily reported in “investments” and “credit derivative liabilities” on the condensed consolidated balance sheets. Non-Consolidated VIEs As described in Note 3, Outstanding Exposure, the Company monitors all policies in the insured portfolio. Of the approximately 15 thousand policies monitored as of September 30, 2023, approximately 14 thousand policies are not within the scope of FASB ASC 810 because these financial guaranties relate to the debt obligations of governmental organizations or financing entities established by a governmental organization. The majority of the remaining policies involve transactions where the Company is not deemed to currently have control over the FG VIEs’ most significant activities. As of September 30, 2023 and December 31, 2022, the Company identified 66 and 85, respectively, policies that contain provisions and experienced events that may trigger consolidation.

Fair Value Measurement

Fair Value Measurement	9 Months Ended
	Sep. 30, 2023
Fair Value Disclosures [Abstract]
Fair Value Measurement	Fair Value Measurement The Company carries a significant portion of its assets and liabilities at fair value. Fair value is defined as the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date (i.e., exit price). The price represents the price available in the principal market for the asset or liability. If there is no principal market, then the price is based on a hypothetical market that maximizes the value received for an asset or minimizes the amount paid for a liability (i.e., the most advantageous market). Fair value is based on quoted market prices, where available. If listed prices or quotes are not available, fair value is based on either internally developed models that primarily use, as inputs, market-based or independently sourced market parameters, including but not limited to yield curves, interest rates and debt prices or with the assistance of an independent third party using a discounted cash flow approach and the third party’s proprietary pricing models. In addition to market information, models also incorporate transaction details, such as maturity of the instrument and contractual features designed to reduce the Company’s credit exposure, such as collateral rights as applicable. Valuation adjustments may be made to ensure that financial instruments are recorded at fair value. These adjustments include amounts to reflect counterparty credit quality, the Company’s creditworthiness and constraints on liquidity. As markets and products develop and the pricing for certain products becomes more or less transparent, the Company may refine its methodologies and assumptions. During nine months 2023, no changes were made to the Company’s valuation models that had, or are expected to have, a material impact on the Company’s condensed consolidated balance sheets or statements of operations and comprehensive income. The Company’s valuation methods produce fair values that may not be indicative of net realizable value or future fair values. The use of different methodologies or assumptions to determine fair value of certain financial instruments could result in a materially different estimate of fair value at the reporting date. The categorization within the fair value hierarchy is determined based on whether the inputs to valuation techniques used to measure fair value are observable or unobservable. Observable inputs reflect market data obtained from independent sources, while unobservable inputs reflect Company estimates of market assumptions. The fair value hierarchy prioritizes model inputs into three broad levels, with Level 1 being the highest and Level 3 the lowest. An asset’s or liability’s categorization within the hierarchy is based on the lowest level of significant input to its valuation. Level 1—Quoted prices for identical instruments in active markets. The Company generally defines an active market as a market in which trading occurs at significant volumes. Active markets generally are more liquid and have a lower bid-ask spread than an inactive market. Level 2—Quoted prices for similar instruments in active markets; quoted prices for identical or similar instruments in markets that are not active; and observable inputs other than quoted prices, such as interest rates or yield curves and other inputs derived from or corroborated by observable market inputs. Level 3—Model derived valuations in which one or more significant inputs or significant value drivers are unobservable. Financial instruments are considered Level 3 when their values are determined using pricing models, discounted cash flow methodologies or similar techniques and at least one significant model assumption or input is unobservable. Level 3 financial instruments also include those for which the determination of fair value requires significant management judgment or estimation. There was a transfer of fixed-maturity security in the investment portfolio from Level 3 to Level 2 during third quarter 2023 and nine months 2023. There were no other transfers from or into Level 3 during the periods presented. Carried at Fair Value Fixed-Maturity Securities The fair value of fixed-maturity securities is generally based on prices received from third-party pricing services or alternative pricing sources with reasonable levels of price transparency. The pricing services prepare estimates of fair value using their pricing models, which take into account: benchmark yields, reported trades, broker/dealer quotes, issuer spreads, two-sided markets, benchmark securities, bids, offers, reference data, industry and economic events and sector groupings. Additional valuation factors that can be taken into account are nominal spreads and liquidity adjustments. The pricing services evaluate each asset class based on relevant market and credit information, perceived market movements, and sector news. Benchmark yields have in many cases taken priority over reported trades for securities that trade less frequently or those that are distressed trades, and therefore may not be indicative of the market. The extent of the use of each input is dependent on the asset class and the market conditions. The valuation of fixed-maturity securities is more subjective when markets are less liquid due to the lack of market-based inputs. As of September 30, 2023, the Company used models to price 189 securities. All Level 3 securities were priced with the assistance of independent third parties. The pricing is based on a discounted cash flow approach using the third party’s proprietary pricing models. The models use inputs such as projected prepayment speeds; severity assumptions; recovery lag assumptions; estimated default rates (determined on the basis of an analysis of collateral attributes, historical collateral performance, borrower profiles and other features relevant to the evaluation of collateral credit quality); home price appreciation/depreciation rates based on macroeconomic forecasts; and recent trading activity. The yield used to discount the projected cash flows is determined by reviewing various attributes of the security including collateral type, weighted average life, sensitivity to losses, vintage, and convexity, in conjunction with market data on comparable securities. Significant changes to any of these inputs could have materially changed the expected timing of cash flows within these securities which is a significant factor in determining the fair value of the securities. Short-Term Investments Short-term investments that are traded in active markets are classified as Level 1 as their value is based on quoted market prices. Securities such as discount notes are classified as Level 2 because these securities are typically not actively traded due to their approaching maturity and, as such, their cost approximates fair value. Other Assets Committed Capital Securities Each of AGC and AGM have entered into put agreements with four separate custodial trusts allowing each of AGC and AGM to issue an aggregate of $200 million of non-cumulative redeemable perpetual preferred securities to the trusts in exchange for cash. Each custodial trust was created for the primary purpose of issuing $50 million face amount of CCS, investing the proceeds in high-quality assets and entering into put options with AGC or AGM, as applicable. The fair value of CCS, which is reported in other assets on the condensed consolidated balance sheets, represents the difference between the present value of remaining expected put option premium payments under AGC CCS and AGM’s Committed Preferred Trust Securities (the AGM CPS) agreements, and the estimated present value that the Company would hypothetically have to pay currently for a comparable security. The change in fair value of the AGC CCS and AGM CPS are reported in “fair value gains (losses) on committed capital securities” in the condensed consolidated statements of operations. The estimated current cost of the Company’s CCS is based on several factors, including AGM and AGC CDS spreads, the Company's publicly traded debt and the term the securities are estimated to remain outstanding. The AGC CCS and AGM CPS are classified as Level 3. Supplemental Executive Retirement Plans The Company classified assets included in the Company’s various supplemental executive retirement plans as either Level 1 or Level 2. The fair value of these assets is based on the observable published daily values of the underlying mutual funds included in the plans (Level 1) or based upon the NAV of the funds if a published daily value is not available (Level 2). The NAVs are based on observable information. The change in fair value of these assets is reported in “other operating expenses” in the condensed consolidated statements of operations. Contracts Accounted for as Credit Derivatives The Company’s credit derivatives in the Insurance segment primarily consist of insured CDS contracts, and also include interest rate swaps that qualify as derivatives under GAAP, which require fair value measurement with changes in the fair value reported in the condensed consolidated statements of operations. The Company did not enter into CDS contracts with the intent to trade these contracts and the Company may not unilaterally terminate a CDS contract absent an event of default or termination event that entitles the Company to terminate such contracts; however, the Company has from time-to-time mutually agreed with various counterparties to terminate certain CDS transactions. In transactions where the counterparty does not have the right to terminate, such transactions were generally terminated for an amount that approximated the present value of future premiums or for a negotiated amount, rather than at fair value. The terms of the Company’s CDS contracts differ from more standardized credit derivative contracts sold by companies outside the financial guaranty industry. The non-standard terms generally include the absence of collateral support agreements or immediate settlement provisions. In addition, the Company employs relatively high attachment points and does not exit derivatives it sells, except under specific circumstances such as mutual agreements with counterparties. Management considers the non-standard terms of the Company’s credit derivative contracts in determining the fair value of these contracts. Due to the lack of quoted prices and other observable inputs for its instruments or for similar instruments, the Company determines the fair value of its credit derivative contracts primarily through internally developed, proprietary models that use both observable and unobservable market data inputs. There is no established market where financial guaranty insured credit derivatives are actively traded; therefore, management has determined that the exit market for the Company’s credit derivatives is a hypothetical one based on its entry market. These contracts are classified as Level 3 in the fair value hierarchy as there are multiple unobservable inputs deemed significant to the valuation model, most importantly the Company’s estimate of the value of the non-standard terms and conditions of its credit derivative contracts and how the Company’s own credit spread affects the pricing of its transactions. The fair value of the Company’s credit derivative contracts represents the difference between the present value of remaining premiums the Company expects to receive and the estimated present value of premiums that a financial guarantor of comparable credit-worthiness would hypothetically charge at the reporting date for the same protection. The fair value of the Company’s credit derivatives depends on a number of factors, including notional amount of the contract, expected term, credit spreads, changes in interest rates, the credit ratings of referenced entities, the Company’s own credit risk and remaining contractual cash flows. The expected remaining contractual premium cash flows are the most readily observable inputs since they are based on the CDS contractual terms. Credit spreads capture the effect of recovery rates and performance of underlying assets of these contracts, among other factors. Consistent with previous years, market conditions at September 30, 2023 were such that market prices of the Company’s CDS contracts were not available. Assumptions and Inputs The various inputs and assumptions that are key to the measurement of the Company’s fair value for CDS contracts are as follows: the gross spread, the allocation of gross spread among the bank profit, net spread and hedge cost and the weighted average life which is based on debt service schedules. The Company obtains gross spreads on its outstanding contracts from market data sources published by third parties (e.g., dealer spread tables for the collateral similar to assets within the Company’s transactions), as well as collateral-specific spreads provided by or obtained from market sources. The bank profit represents the profit the originator, usually an investment bank, realizes for structuring and funding the transaction; the net spread represents the premiums paid to the Company for the Company’s credit protection provided; and the hedge cost represents the cost of CDS protection purchased by the originator to hedge its counterparty credit risk exposure to the Company. The primary sources of information used to determine gross spread include: • Actual collateral specific credit spreads (if up-to-date and reliable market-based spreads are available). • Transactions priced or closed during a specific quarter within a specific asset class and specific rating. • Credit spreads interpolated based upon market indices adjusted to reflect the non-standard terms of the Company’s CDS contracts. • Credit spreads extrapolated based upon transactions of similar asset classes, similar ratings, and similar time to maturity. • Credit spreads provided by the counterparty of the CDS. The rates used to discount future expected premium cash flows ranged from 3.62% to 5.41% at September 30, 2023 and 2.78% to 5.08% at December 31, 2022. The premium the Company receives is referred to as the “net spread.” The Company’s pricing model takes into account not only how credit spreads on risks that it assumes affect pricing, but also how the Company’s own credit spread affects the pricing of its transactions. The Company’s own credit risk is factored into the determination of net spread based on the impact of changes in the quoted market price for credit protection bought on the Company, as reflected by quoted market prices on CDS referencing AGC. Due to the relatively low volume and characteristics of CDS contracts remaining in AGM’s portfolio, changes in AGM’s credit spreads do not significantly affect the fair value of these CDS contracts. The Company obtains the quoted price of CDS contracts traded on AGC from market data sources published by third parties. The cost to acquire CDS protection referencing AGC affects the amount of spread on CDS transactions that the Company retains and, hence, their fair value. As the cost to acquire CDS protection referencing AGC increases, the amount of premium the Company retains on a transaction generally decreases. In the Company’s valuation model, the premium the Company captures is not permitted to go below the minimum rate that the Company would currently charge to assume similar risks. This assumption can have the effect of limiting the amount of unrealized gains that are recognized on certain CDS contracts. Given market conditions and the Company’s own credit spreads, approximately 11.2%, based on fair value, of the Company’s CDS contracts were fair valued using this minimum premium as of September 30, 2023. As of December 31, 2022, the use of the minimum premium did not have a significant effect on fair value. The percentage of transactions that price using the minimum premiums fluctuates due to changes in AGC’s credit spreads. In general, when AGC’s credit spreads narrow, the cost to hedge AGC’s name declines and more transactions price above previously established floor levels. Meanwhile, when AGC’s credit spreads widen, the cost to hedge AGC’s name increases causing more transactions to price at established floor levels. The Company corroborates the assumptions in its fair value model, including the portion of exposure to AGC hedged by its counterparties, with independent third parties periodically. The implied credit risk of AGC, indicated by the trading level of AGC’s own credit spread, is a significant factor in the amount of exposure to AGC that a bank or transaction hedges. When AGC’s credit spreads widen, the hedging cost of a bank or originator increases. Higher hedging costs reduce the amount of contractual cash flows AGC can capture as premium for selling its protection, while lower hedging costs increase the amount of contractual cash flows AGC can capture. The amount of premium a financial guaranty insurance market participant can demand is inversely related to the cost of credit protection on the insurance company as measured by market credit spreads assuming all other assumptions remain constant. This is because the buyers of credit protection typically hedge a portion of their risk to the financial guarantor, due to the fact that the contractual terms of the Company’s contracts typically do not require the posting of collateral by the guarantor. The extent of the hedge depends on the types of instruments insured and the current market conditions. A credit derivative liability on protection sold is the result of contractual cash inflows on in-force transactions that are lower than what a hypothetical financial guarantor could receive if it sold protection on the same risk as of the reporting date. If the Company were able to freely exchange these contracts (i.e., assuming its contracts did not contain proscriptions on transfer and there was a viable exchange market), it would realize a loss representing the difference between the lower contractual premiums to which it is entitled and the current market premiums for a similar contract. The Company determines the fair value of its CDS contracts by applying the difference between the current net spread and the contractual net spread for the remaining duration of each contract to the notional value of such contract and discounting such amounts using the applicable discount rate corresponding to the weighted average remaining life of the contract. Strengths and Weaknesses of Model The Company’s credit derivative valuation model, like any financial model, has certain strengths and weaknesses. The primary strengths of the Company’s CDS modeling techniques are: • The model takes into account the transaction structure and the key drivers of market value. • The model maximizes the use of market-driven inputs whenever they are available. • The model is a consistent approach to valuing positions. The primary weaknesses of the Company’s CDS modeling techniques are: • There is no exit market or any actual exit transactions; therefore, the Company’s exit market is a hypothetical one based on the Company’s entry market. • There is a very limited market in which to validate the reasonableness of the fair values developed by the Company’s model. • The markets for the inputs to the model are highly illiquid, which impacts their reliability. • Due to the non-standard terms under which the Company enters into derivative contracts, the fair value of its credit derivatives may not reflect the same prices observed in an actively traded market of credit derivatives that do not contain terms and conditions similar to those observed in the financial guaranty market. FG VIEs’ Assets and Liabilities FG VIEs include Puerto Rico Trusts and structured finance and other FG VIEs. Assets in the Puerto Rico Trusts, which consist of New Recovery Bonds and CVIs, are classified as Level 2. The Company elected the FVO for the Puerto Rico Trusts’ liabilities and they are classified as Level 3. See “ - Fixed Maturity Securities” above for a description of the fair value methodology for the New Recovery Bonds and CVIs in the Puerto Rico Trusts. Structured finance and other FG VIEs’ assets and liabilities are carried at fair value under the FVO and are classified as Level 3. The fair value of the residential mortgage loan FG VIEs’ assets is generally sensitive to changes in estimated prepayment speeds; estimated default rates (determined on the basis of an analysis of collateral attributes such as: historical collateral performance, borrower profiles and other features relevant to the evaluation of collateral credit quality); yields implied by market prices for similar securities; and, as applicable, house price depreciation/appreciation rates based on macroeconomic forecasts. Significant changes to some of these inputs could have materially changed the fair value of the FG VIEs’ assets and the implied collateral losses within these transactions. In general, the fair value of the FG VIEs’ assets is most sensitive to changes in the projected collateral losses, where an increase in collateral losses typically could lead to a decrease in the fair value of FG VIEs’ assets, while a decrease in collateral losses typically leads to an increase in the fair value of FG VIEs’ assets. The prices of the assets and liabilities of the FG VIEs are generally determined with the assistance of an independent third party, based on a discounted cash flow approach. The third party pricing service utilizes an internal model to determine an appropriate yield at which to discount the cash flows of the security, by factoring in collateral types, weighted-average lives and other structural attributes specific to the security being priced. The expected yield is further calibrated by utilizing algorithms designed to aggregate market color, received by the independent third party, on comparable bonds. The models used to price the FG VIEs’ liabilities (other than the liabilities of the Puerto Rico Trusts) generally apply the same inputs used in determining fair value of FG VIEs’ assets. For those liabilities insured by the Company, the benefit of the Company’s insurance policy guaranteeing the timely payment of debt service is also taken into account. The liabilities of the Puerto Rico Trusts are priced based on the value of the assets in the Puerto Rico Trusts including the value of the insurance subsidiaries’ financial guaranty policies. Significant changes to any of the inputs described above could materially change the timing of expected losses within an insured transaction which is a significant factor in determining the implied benefit of the Company’s insurance policy guaranteeing the timely payment of principal and interest for the insured tranches of debt issued by the FG VIEs. In general, extending the timing of expected loss payments by the Company into the future typically could lead to a decrease in the value of the Company’s insurance and a decrease in the fair value of the Company’s FG VIEs’ liabilities with recourse, while a shortening of the timing of expected loss payments by the Company typically could lead to an increase in the value of the Company’s insurance and an increase in the fair value of the Company’s FG VIEs’ liabilities with recourse. The change in fair value of FG VIEs’ assets and liabilities is reported in “fair value gains (losses) on FG VIEs” in the condensed consolidated statement of operations, except for (i) the change in fair value attributable to change in ISCR on FG VIEs’ liabilities, and (ii) unrealized gains and losses on the New Recovery Bonds in the Puerto Rico Trusts, which are reported in OCI. Interest income and interest expense are derived from the trustee reports and also included in “fair value gains (losses) on FG VIEs.” Investment income on the New Recovery Bonds and changes in fair value on the CVIs in the Puerto Rico Trusts are all reported in “fair value gains (losses) on FG VIEs” on the condensed consolidated statement of operations. Assets and Liabilities of CIVs Investments held by CIVs which are listed or quoted on a national securities exchange or market are valued at their last reported sale price on the date of determination. Investments held by CIVs which are not listed or quoted on an exchange, but are traded over-the-counter, or are listed on an exchange which has no reported sales, are valued at their fair value as determined by the Company, after giving consideration to third-party data generally at the average between the offer and bid prices. The methods and procedures to value these investments may include, but are not limited to: (i) performing comparisons with prices of comparable or similar investments; (ii) obtaining valuation-related information from issuers; (iii) calculating the present value of future cash flows; (iv) assessing other analytical data and information related to the investment that is an indication of value; (v) obtaining information provided by third parties; and/or (vi) evaluating information provided by management of these investments. These fair values are generally based on dealer quotes, indications of value or pricing models that consider the time value of money, the current market, contractual prices and potential volatilities of the underlying financial instruments. Inputs are used in applying the various valuation techniques and broadly refer to the current assumptions that market participants use to make valuation decisions, including assumptions about risk. Inputs may include dealer price quotations, yield curves, credit curves, forward/CDS/index spreads, prepayments rates, strike and expiry dates, volatility statistics and other factors. Investments in private equity funds are generally valued utilizing NAV. Until July 1, 2023, the consolidated CLOs were collateralized financing entities (CFEs), and therefore, the debt issued by, and loans held by, the consolidated CLOs were measured under the FVO using the CFE practical expedient. Loans in CLOs were priced using a loan pricing service which aggregated quotes from loan market participants. The loans were all Level 2 assets, which are more observable than the fair value of the Level 3 debt issued by the consolidated CLOs. As a result, the less observable CLO debt was measured on the basis of the more observable CLO loans. Under the CFE practical expedient guidance, the loans of consolidated CLOs were measured at fair value and the debt of consolidated CLOs were measured as: (1) the sum of (i) the fair value of the financial assets, and (ii) the carrying value of any nonfinancial assets held temporarily; less (2) the sum of (iii) the fair value of any beneficial interests retained by the Company (other than those that represent compensation for services), and (iv) the Company’s carrying value of any beneficial interests that represent compensation for services. The resulting amount was allocated to the individual financial liabilities (other than the underlying financial liabilities to the beneficial interests retained by the Company). Prior to securitization, when loans were warehoused in an investment vehicle, such vehicle was not considered a CFE. The Company had elected the FVO to measure the loans held and the debt issued by CLO warehouses to mitigate the accounting mismatch between such assets and liabilities when a CLO warehouse securitized and became a CLO. As of December 31, 2022, Level 2 assets in the CIVs included assets of the consolidated CLOs and certain assets of the consolidated funds. Level 3 assets in the CIVs included the remainder of the invested assets of consolidated funds. Level 2 liabilities in the CIVs included senior warehouse financing debt used to fund a CLO warehouse (measured under the FVO). Level 3 liabilities of the CIVs included various tranches of CLO debt, first loss subordinated warehouse financing and securitized borrowing. Significant changes to any of the inputs described above could have a material effect on the fair value of the consolidated assets and liabilities. Amounts recorded at fair value in the Company’s financial statements are presented in the tables below. Fair Value Hierarchy of Financial Instruments Carried at Fair Value As of September 30, 2023 Fair Value Hierarchy Level 1 Level 2 Level 3 Total (in millions) Assets: Fixed-maturity securities, available-for-sale Obligations of state and political subdivisions $ — $ 2,764 $ 2 $ 2,766 U.S. government and agencies — 58 — 58 Corporate securities — 2,009 — 2,009 Mortgage-backed securities: RMBS — 177 153 330 CMBS — 188 — 188 Asset-backed securities — 27 796 823 Non-U.S. government securities — 93 — 93 Total fixed-maturity securities, available-for-sale — 5,316 951 6,267 Fixed-maturity securities, trading — 350 — 350 Short-term investments 1,418 8 — 1,426 Other invested assets (1) — — 3 3 FG VIEs’ assets — 146 180 326 Assets of CIVs: Equity securities and warrants — 4 75 79 Structured products — 66 173 239 Total assets of CIVs — 70 248 318 Other assets 51 48 13 112 Total assets carried at fair value $ 1,469 $ 5,938 $ 1,395 $ 8,802 Liabilities: Credit derivative liabilities $ — $ — $ 50 $ 50 FG VIEs’ liabilities (3) — — 542 542 Total liabilities carried at fair value $ — $ — $ 592 $ 592 Fair Value Hierarchy of Financial Instruments Carried at Fair Value As of December 31, 2022 Fair Value Hierarchy Level 1 Level 2 Level 3 Total (in millions) Assets: Fixed-maturity securities, available-for sale Obligations of state and political subdivisions $ — $ 3,347 $ 47 $ 3,394 U.S. government and agencies — 111 — 111 Corporate securities — 2,084 — 2,084 Mortgage-backed securities: RMBS — 161 179 340 CMBS — 271 — 271 Asset-backed securities — 27 794 821 Non-U.S. government securities — 98 — 98 Total fixed-maturity securities, available-for-sale — 6,099 1,020 7,119 Fixed-maturity securities, trading — 303 — 303 Short-term investments 771 39 — 810 Other invested assets (1) 2 — 5 7 FG VIEs’ assets — 209 204 413 Assets of CIVs (2): Fund investments: Equity securities and warrants — 5 297 302 Corporate securities — — 96 96 Structured products — 82 46 128 CLOs and CLO warehouse assets: Loans — 4,570 — 4,570 Short-term investments 135 — — 135 Total assets of CIVs 135 4,657 439 5,231 Other assets 54 46 48 148 Total assets carried at fair value $ 962 $ 11,353 $ 1,716 $ 14,031 Liabilities: Credit derivative liabilities $ — $ — $ 163 $ 163 FG VIEs’ liabilities (3) — — 715 715 Liabilities of CIVs: CLO obligations of CFEs — — 4,090 4,090 Warehouse financing debt — 277 36 313 Securitized borrowing — — 28 28 Total liabilities of CIVs — 277 4,154 4,431 Other liabilities — 7 — 7 Total liabilities carried at fair value $ — $ 284 $ 5,032 $ 5,316 ___________________ (1) Includes Level 3 mortgage loans that are recorded at fair value on a non-recurring basis. (2) As of December 31, 2022, excludes $5 million in investments in AssuredIM funds for which the Company recorded a 100% NCI. The consolidation of these funds resulted in a gross up of assets and NCI on the consolidated financial statements; however, it resulted in no economic equity or net income attributable to AGL. (3) Includes FG VIEs’ liabilities with recourse and FG VIEs’ liabilities without recourse. See Note 8, Financial Guaranty Variable Interest Entities and Consolidated Investment Vehicles. Changes in Level 3 Fair Value Measurements The tables below present a roll forward of the Company’s Level 3 financial instruments carried at fair value on a recurring basis during third quarter 2023, third quarter 2022, nine months 2023 and nine months 2022. Roll Forward of Level 3 Assets (Liabilities) at Fair Value on a Recurring Basis Third Quarter 2023 Fixed-Maturity Securities, Available-for-Sale Assets of CIVs Obligations RMBS Asset- FG VIEs’ Equity Securities and Warrants Corporate Securities Structured Products Other (in millions) Fair value as of June 30, 2023 $ 46 $ 162 $ 800 $ 188 $ 290 $ 84 $ — $ 33 Total pre-tax realized and unrealized gains (losses) recorded in: Net income (loss) — 4 (1) 13 (1) 1 (2) 5 (4) — 7 (4) (20) (3) Other comprehensive income (loss) (3) (6) (2) — — — — — Purchases — — — — 3 — — — Sales — — — — (4) — — — Settlements (1) (7) (15) (9) — — — — Consolidations — — — — — — — — Deconsolidations — — — — (219) (84) 166 — Transfers out of Level 3 (40) — — — — — — — Fair value as of September 30, 2023 $ 2 $ 153 $ 796 $ 180 $ 75 $ — $ 173 $ 13 Change in unrealized gains (losses) related to financial instruments held as of September 30, 2023 included in: Earnings $ — $ 6 (4) $ — $ 7 (4) $ (20) (3) OCI $

Asset Management Fees

Asset Management Fees	9 Months Ended
	Sep. 30, 2023
Revenue from Contract with Customer [Abstract]
Asset Management Fees	Asset Management Fees The following table presents the sources of asset management fees on a consolidated basis through the end of June 30, 2023. Upon closing of the Sound Point Transaction and the AHP Transaction, the Company deconsolidated the transferred AssuredIM subsidiaries and reports its investment in Sound Point as an equity method investment (on a one-quarter lag). As a result, the Company no longer has asset management fee revenues on its consolidated statement of operations. Asset Management Fees Third Quarter Nine Months 2023 2022 2023 2022 (in millions) Management fees $ — $ 11 $ 21 $ 41 Performance fees — 2 18 17 Reimbursable fund expenses — 3 14 13 Total asset management fees $ — $ 16 $ 53 $ 71

Long-Term Debt

Long-Term Debt	9 Months Ended
	Sep. 30, 2023
Debt Disclosure [Abstract]
Long-Term Debt	Long-Term Debt The principal and carrying values of the Company’s debt are presented in the table below. Principal and Carrying Amounts of Long-Term Debt As of September 30, 2023 As of December 31, 2022 Principal Carrying Principal Carrying (in millions) AGUS 5% Senior Notes $ — $ — $ 330 $ 329 AGUS 6.125% Senior Notes 350 345 — — AGUS 3.15% Senior Notes 500 495 500 495 AGUS 7% Senior Notes 200 198 200 198 AGUS 3.6% Senior Notes 400 395 400 395 AGUS Series A Enhanced Junior Subordinated Debentures 150 150 150 150 AGMH Junior Subordinated Debentures (1) 146 110 146 108 Total $ 1,746 $ 1,693 $ 1,726 $ 1,675 ____________________ (1) Carrying amounts are different than principal amounts primarily due to fair value adjustments at the date of the AGMH acquisition, which are accreted into interest expense over the remaining terms of these obligations. Net of AGMH’s long-term debt purchased by AGUS. 6.125% Senior Notes. On August 21, 2023, AGUS issued $350 million of 6.125% Senior Notes due 2028 (6.125% Senior Notes) for net proceeds of $345 million. The net proceeds from the issuance were used for the redemption on September 25, 2023, of $330 million of AGUS’s debt maturing in 2024. AGUS may redeem all or part of the 6.125% Senior Notes at any time or from time to time prior to August 15, 2028 (the date that is one month prior to the maturity of the 6.125% Senior Notes), at its option, at a redemption price equal to the greater of: (i) 100% of the principal amount of the 6.125% Senior Notes being redeemed; and (ii) the sum of the present values of the remaining scheduled payments of principal and interest on the 6.125% Senior Notes being redeemed (excluding interest accrued to the redemption date) from the redemption date to August 15, 2028 discounted to the date of redemption on a semi-annual basis (assuming a 360-day year consisting of twelve 30-day months) at a discount rate equal to the treasury rate plus 30 bps; plus, in each case, accrued and unpaid interest on the 6.125% Senior Notes to be redeemed to, but excluding, the redemption date. AGUS may redeem all or part of the 6.125% Senior Notes at any time or from time to time on and after August 15, 2028, at its option, at a redemption price equal to 100% of the principal amount of the 6.125% Senior Notes being redeemed, plus accrued and unpaid interest on the 6.125% Senior Notes to be redeemed to, but excluding, the redemption date. The 6.125% Senior Notes are fully and unconditionally guaranteed on a senior unsecured basis by AGL. The 6.125% Senior Notes are senior unsecured obligations of AGUS and rank equally in right of payment with all of AGUS’s other unsecured and unsubordinated indebtedness outstanding. The guarantee is a senior unsecured obligation of AGL and ranks equally in right of payment with all of AGL’s other unsecured and unsubordinated indebtedness outstanding.

Income Taxes

Income Taxes	9 Months Ended
	Sep. 30, 2023
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes Overview AGL and its Bermuda subsidiaries AG Re, AGRO and Cedar Personnel Ltd. (collectively, the Bermuda Subsidiaries) are not subject to any income, withholding or capital gains taxes under current Bermuda law. AGL’s U.S., U.K. and French subsidiaries are subject to income taxes imposed by U.S., U.K. and French authorities, respectively, and file applicable tax returns. In addition, AGRO, a Bermuda domiciled company, has elected under Section 953(d) of the U.S. Internal Revenue Code to be taxed as a U.S. domestic corporation. AGL is a tax resident in the U.K. although it remains a Bermuda-based company and its administrative and head office functions continue to be carried on in Bermuda. AGUS files a consolidated federal income tax return with all of its U.S. subsidiaries. Assured Guaranty Overseas US Holdings Inc. and its subsidiaries, AGRO and AG Intermediary Inc., file their own consolidated federal income tax return. In July of 2023, the U.K. government passed legislation to implement the Organization for Economic Co-Operation and Development (OECD) Base Erosion and Profit Shifting (BEPS) Pillar Two income inclusion rule. This includes a multinational top-up tax which will apply to large multinational corporations for accounting periods beginning on or after December 31, 2023. It is expected this will apply to AGL and subsidiaries, requiring a minimum effective rate of 15% in all jurisdictions in which it operates. In addition, in August of 2023 the Bermuda government released the first of two public consultations for the introduction of a corporate income tax in Bermuda in response to the Pillar II initiatives. The Bermuda tax is expected to be enacted in 2023 to be effective in 2025. According to a second public consultation paper issued by the Ministry of Finance of the Bermuda Government, the Government of Bermuda believes it is reasonable and proportionate for any new Bermuda corporate income tax regime to supersede any existing tax assurances given to companies such as AGL and its Bermuda subsidiaries. The Company is assessing the impact of both the U.K. legislation and the Bermuda proposal. Tax Assets (Liabilities) Deferred and Current Tax Assets (Liabilities) As of September 30, 2023 December 31, 2022 (in millions) Net deferred tax assets (liabilities) $ 82 $ 114 Net current tax assets (liabilities) 34 63 Valuation Allowance During 2023, the Company recorded a return to provision adjustment, which included the utilization of $3 million in foreign tax credits, thereby reducing the Company’s foreign tax credits (FTC) from $5 million as of December 31, 2022 to $2 million as of September 30, 2023. As of September 30, 2023, the Company believes that the weight of the positive evidence outweighs the negative evidence regarding the realization of the Company’s foreign tax credits, resulting in the release of the corresponding valuation allowance. The Company came to the conclusion that it is more likely than not that the deferred tax assets will be fully realized after weighing all positive and negative evidence available as required under GAAP. The positive evidence that was considered included the cumulative income the Company has earned over the last three years and the significant unearned premium income to be included in taxable income. The positive evidence outweighs any negative evidence that exists. As such, the Company believes that no valuation allowance is necessary in connection with the remaining deferred tax assets. The Company will continue to analyze the need for a valuation allowance on a quarterly basis. Changes in market conditions during 2023 and 2022, including rising interest rates, resulted in the recording of deferred tax assets related to net unrealized tax capital losses. When assessing recoverability of these deferred tax assets, the Company considers the ability and intent to hold the underlying securities to recovery in value, if necessary, as well as other factors as noted above. As of September 30, 2023 and December 31, 2022, based on all available evidence, including capital loss carryback capacity, the Company concluded that the deferred tax assets related to the unrealized tax capital losses on the available-for-sale securities portfolios are, more likely than not, expected to be realized. Provision for Income Taxes The Company’s provision for income taxes for interim financial periods is not based on an estimated annual effective rate due, for example, to the variability in loss reserves, fair value of its credit derivatives and VIEs, and foreign exchange gains and losses which prevents the Company from projecting a reliable estimated annual effective tax rate and pre-tax income for the full year 2023. A discrete calculation of the provision is calculated for each interim period. The effective tax rates reflect the proportion of income recognized by each of the Company’s operating subsidiaries, with U.S. subsidiaries taxed at the U.S. marginal corporate income tax rate of 21% and the French subsidiary taxed at the French marginal corporate tax rate of 25%, and no taxes for the Company’s Bermuda Subsidiaries unless subject to U.S. tax by election. For the periods between April 1, 2017 and March 31, 2023, the U.K. corporation tax rate was 19%. For periods subsequent to April 1, 2023, the U.K. corporation tax rate has been increased to 25%. For the full year 2023, the U.K. subsidiaries will be taxed at the U.K. blended marginal corporate tax rate of 23.5%. The Company’s overall effective tax rate fluctuates based on the distribution of income across jurisdictions. A reconciliation of the difference between the provision for income taxes and the expected tax provision at statutory rates in taxable jurisdictions is presented below. Effective Tax Rate Reconciliation Third Quarter Nine Months 2023 2022 2023 2022 (in millions) Expected tax provision (benefit) $ 45 $ (6) $ 88 $ 6 Tax-exempt interest (3) (3) (9) (10) NCI (1) 1 (4) (5) Return to provision adjustment (6) (20) (6) (20) State taxes 1 2 8 10 Foreign taxes 7 (1) 8 9 Taxes on reinsurance (1) — (1) (1) Stock based compensation 2 — 2 4 Other (1) — (2) 1 Total provision (benefit) for income taxes $ 43 $ (27) $ 84 $ (6) Effective tax rate 21.4 % 123.5 % 18.1 % (12.1) % The expected tax provision (benefit) is calculated as the sum of pre-tax income in each jurisdiction multiplied by the statutory tax rate of the jurisdiction by which it will be taxed. Where there is a pre-tax loss in one jurisdiction and pre-tax income in another, the total combined expected tax rate may be higher or lower than any of the individual statutory rates. The following tables present pre-tax income and revenue by jurisdiction. Pre-tax Income (Loss) by Tax Jurisdiction Third Quarter Nine Months 2023 2022 2023 2022 (in millions) U.S. $ 233 $ 3 $ 458 $ 112 Bermuda (17) 10 41 27 U.K. (10) (30) (25) (75) Other (4) (5) (8) (15) Total $ 202 $ (22) $ 466 $ 49 Revenue by Tax Jurisdiction Third Quarter Nine Months 2023 2022 2023 2022 (in millions) U.S. $ 373 $ 60 $ 901 $ 435 Bermuda 30 4 123 43 U.K. 1 (21) 22 (39) Other (1) (2) — (8) Total $ 403 $ 41 $ 1,046 $ 431 Pre-tax income by jurisdiction may be disproportionate to revenue by jurisdiction to the extent that insurance losses incurred are disproportionate. Audits As of September 30, 2023, AGUS had open tax years with the U.S. Internal Revenue Service (IRS) for 2018 forward and is currently under audit for the 2018 and 2019 tax years. As of September 30, 2023, Assured Guaranty Overseas US Holdings Inc. had open tax years with the IRS for 2019 forward and is not currently under audit with the IRS. In September 2022, His Majesty’s Revenue & Customs completed a business risk review of Assured Guaranty that commenced in July 2022 and assigned a low-risk rating for corporate taxes in the U.K. The Company’s French subsidiary is not currently under examination and has open tax years of 2019 forward.

Commitments and Contingencies

Commitments and Contingencies	9 Months Ended
	Sep. 30, 2023
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	Commitments and Contingencies Legal Proceedings Lawsuits arise in the ordinary course of the Company’s business. It is the opinion of the Company’s management, based upon the information available, that the expected outcome of litigation against the Company, individually or in the aggregate, will not have a material adverse effect on the Company’s financial position, although an adverse resolution of litigation against the Company in a fiscal quarter or year could have a material adverse effect on the Company’s results of operations or liquidity in a particular quarter or year. In addition, in the ordinary course of their respective businesses, certain of AGL’s insurance subsidiaries are involved in litigation with third parties to recover insurance losses paid in prior periods or prevent or reduce losses in the future. For example, the Company is involved in a number of legal actions in the Federal District Court of Puerto Rico to enforce or defend its rights with respect to the obligations it insures of Puerto Rico and various of its related authorities and public corporations. See the “Exposure to Puerto Rico” section of Note 3, Outstanding Exposure, for a description of such actions. The impact, if any, of these and other proceedings on the amount of recoveries the Company receives and losses it pays in the future is uncertain, and the impact of any one or more of these proceedings during any quarter or year could be material to the Company’s results of operations in that particular quarter or year. In the first quarter of 2023, the Company reduced its previously recorded accrual of $20 million to zero in connection with developments in litigation. The Company also receives subpoenas and interrogatories from regulators from time to time. Litigation On November 28, 2011, Lehman Brothers International (Europe) (in administration) (LBIE) sued AG Financial Products Inc. (AGFP), an affiliate of AGC, which, in the past, had provided credit protection to counterparties under CDS. AGC acts as the credit support provider of AGFP under these CDS. LBIE’s complaint, which was filed in the Supreme Court of the State of New York (the Court), asserted a claim for breach of the implied covenant of good faith and fair dealing based on AGFP's termination in December 2008 of nine credit derivative transactions between LBIE and AGFP and asserted claims for breach of contract and breach of the implied covenant of good faith and fair dealing based on AGFP’s termination in July 2009 of 28 other credit derivative transactions between LBIE and AGFP and AGFP’s calculation of the termination payment in connection with those 28 other credit derivative transactions. Following defaults by LBIE, AGFP had terminated the transactions in question in compliance with the agreement between AGFP and LBIE, and properly calculated that LBIE owes AGFP approximately $4 million for the claims which were dismissed (as described below) and approximately $21 million in connection with the termination of the other credit derivative transactions, whereas LBIE asserted in the complaint that AGFP owes LBIE a termination payment of approximately $1.4 billion. On March 15, 2013, the Court granted AGFP’s motion to dismiss in respect of the count relating to the nine credit derivative transactions and narrowed LBIE’s claim with respect to the 28 other credit derivative transactions. Following a bench trial, on March 8, 2023, the Court rendered its decision and found in favor of AGFP. On June 30, 2023, the clerk entered judgment in favor of AGFP in the amount of approximately $54 million plus prejudgment simple interest at an annual rate of 8%. On September 22, 2023, LBIE appealed this judgment. On July 1, 2023, AGFP moved the Court to award it approximately $58 million for attorneys’ fees and expenses AGFP incurred through March 2023. The parties reached a confidential settlement with respect to this motion for attorneys’ fees, and AGFP withdrew the motion without prejudice on October 30, 2023. The Company did not accrue in its financial statements for the judgment it was awarded or the attorneys’ fees it sought.

Shareholders' Equity

Shareholders' Equity	9 Months Ended
	Sep. 30, 2023
Equity [Abstract]
Shareholders' Equity	Shareholders’ Equity Other Comprehensive Income The following tables present the changes in each component of accumulated other comprehensive income (AOCI) and the effect of reclassifications out of AOCI into the respective lines in the condensed consolidated statements of operations. Changes in Accumulated Other Comprehensive Income (Loss) by Component Third Quarter 2023 Net Unrealized Gains (Losses) on Investments with: ISCR on Cumulative Cash Flow Total AOCI No Credit Impairment Credit Impairment (in millions) Balance, June 30, 2023 $ (284) $ (115) $ (22) $ (42) $ 5 $ (458) Other comprehensive income (loss) before reclassifications (115) (14) 10 (1) — (120) Less: Amounts reclassified from AOCI to: Net realized investment gains (losses) (2) (7) — — — (9) Fair value gains (losses) on CIVs — — — (6) — (6) Total before tax (2) (7) — (6) — (15) Tax (provision) benefit — 1 — 1 — 2 Total amount reclassified from AOCI, net of tax (2) (6) — (5) — (13) Other comprehensive income (loss) (113) (8) 10 4 — (107) Balance, September 30, 2023 $ (397) $ (123) $ (12) $ (38) $ 5 $ (565) Changes in Accumulated Other Comprehensive Income (Loss) by Component Third Quarter 2022 Net Unrealized Gains (Losses) on Investments with: ISCR on Cumulative Cash Flow Total AOCI No Credit Impairment Credit Impairment (in millions) Balance, June 30, 2022 $ (205) $ (107) $ (19) $ (45) $ 6 $ (370) Other comprehensive income (loss) before reclassifications (286) (1) (3) (4) — (294) Less: Amounts reclassified from AOCI to: Net realized investment gains (losses) (11) (3) — — — (14) Total before tax (11) (3) — — — (14) Tax (provision) benefit 2 — — — — 2 Total amount reclassified from AOCI, net of tax (9) (3) — — — (12) Other comprehensive income (loss) (277) 2 (3) (4) — (282) Balance, September 30, 2022 $ (482) $ (105) $ (22) $ (49) $ 6 $ (652) Changes in Accumulated Other Comprehensive Income (Loss) by Component Nine Months 2023 Net Unrealized Gains (Losses) on Investments with: ISCR on Cumulative Cash Flow Total AOCI No Credit Impairment Credit Impairment (in millions) Balance, December 31, 2022 $ (343) $ (110) $ (23) $ (45) $ 6 $ (515) Other comprehensive income (loss) before reclassifications (54) (31) 9 2 — (74) Less: Amounts reclassified from AOCI to: Net realized investment gains (losses) 2 (22) — — — (20) Fair value gains (losses) on FG VIEs — — (2) — — (2) Fair value gains (losses) on CIVs — — — (6) — (6) Interest expense — — — — 1 1 Total before tax 2 (22) (2) (6) 1 (27) Tax (provision) benefit (2) 4 — 1 — 3 Total amount reclassified from AOCI, net of tax — (18) (2) (5) 1 (24) Other comprehensive income (loss) (54) (13) 11 7 (1) (50) Balance, September 30, 2023 $ (397) $ (123) $ (12) $ (38) $ 5 $ (565) Changes in Accumulated Other Comprehensive Income (Loss) by Component Nine Months 2022 Net Unrealized Gains (Losses) on Investments with: ISCR on Cumulative Cash Flow Total AOCI No Credit Impairment Credit Impairment (in millions) Balance, December 31, 2021 $ 375 $ (24) $ (21) $ (36) $ 6 $ 300 Other comprehensive income (loss) before reclassifications (886) (92) (2) (13) — (993) Less: Amounts reclassified from AOCI to: Net realized investment gains (losses) (35) (13) — — — (48) Fair value gains (losses) on FG VIEs — — (2) — — (2) Total before tax (35) (13) (2) — — (50) Tax (provision) benefit 6 2 1 — — 9 Total amount reclassified from AOCI, net of tax (29) (11) (1) — — (41) Other comprehensive income (loss) (857) (81) (1) (13) — (952) Balance, September 30, 2022 $ (482) $ (105) $ (22) $ (49) $ 6 $ (652) Share Repurchases On November 1, 2023, the Board of Directors (the Board) authorized the repurchase of an additional $300 million of its common shares. Under this and previous authorizations, as of November 7, 2023, the Company was authorized to purchase $372 million of its common shares. The Company expects to repurchase shares from time to time in the open market or in privately negotiated transactions. The timing, form and amount of the share repurchases under the program are at the discretion of management and will depend on a variety of factors, including funds available at the parent company, other potential uses for such funds, market conditions, the Company’s capital position, legal requirements and other factors. The repurchase program may be modified, extended or terminated by the Board at any time. It does not have an expiration date. Share Repurchases Period Number of Shares Repurchased Total Payments Average Price Paid Per Share 2022 (January 1 - March 31) 2,738,223 $ 155 $ 56.62 2022 (April 1 - June 30) 2,605,947 151 58.03 2022 (July 1- September 30) 1,790,395 97 53.77 2022 (October 1- December 31) 1,713,416 100 58.34 Total 2022 8,847,981 $ 503 56.79 2023 (January 1 - March 31) 36,369 2 62.23 2023 (April 1 - June 30) 453,942 24 53.08 2023 (July 1 - September 30) 1,065,902 64 59.67 2023 (October 1 - November 7) 682,676 42 61.17 Total 2023 2,238,889 $ 132 58.83

Earnings Per Share

Earnings Per Share	9 Months Ended
	Sep. 30, 2023
Earnings Per Share [Abstract]
Earnings Per Share	Earnings Per Share Computation of Earnings Per Share Third Quarter Nine Months 2023 2022 2023 2022 (in millions, except per share amounts) Basic Earnings Per Share (EPS): Net income (loss) attributable to AGL $ 157 $ 11 $ 363 $ 30 Less: Distributed and undistributed income (loss) available to nonvested shareholders 2 — 3 — Distributed and undistributed income (loss) available to common shareholders of AGL and subsidiaries, basic $ 155 $ 11 $ 360 $ 30 Basic shares 58.5 61.7 58.9 63.9 Basic EPS $ 2.65 $ 0.18 $ 6.11 $ 0.47 Diluted EPS: Distributed and undistributed income (loss) available to common shareholders of AGL and subsidiaries, basic $ 155 $ 11 $ 360 $ 30 Plus: Re-allocation of undistributed income (loss) available to nonvested shareholders of AGL and subsidiaries — — — — Distributed and undistributed income (loss) available to common shareholders of AGL and subsidiaries, diluted $ 155 $ 11 $ 360 $ 30 Basic shares 58.5 61.7 58.9 63.9 Dilutive securities: Restricted stock awards 1.1 1.2 1.1 1.2 Diluted shares 59.6 62.9 60.0 65.1 Diluted EPS $ 2.60 $ 0.18 $ 5.99 $ 0.46 Potentially dilutive securities excluded from computation of EPS because of antidilutive effect 0.1 0.1 0.1 0.8

Pay vs Performance Disclosure

Pay vs Performance Disclosure - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Pay vs Performance Disclosure
Net Income (Loss)	$ 157	$ 11	$ 363	$ 30

Insider Trading Arrangements

Insider Trading Arrangements	3 Months Ended
	Sep. 30, 2023
Trading Arrangements, by Individual
Rule 10b5-1 Arrangement Adopted	false
Non-Rule 10b5-1 Arrangement Adopted	false
Rule 10b5-1 Arrangement Terminated	false
Non-Rule 10b5-1 Arrangement Terminated	false

Business and Basis of Present_2

Business and Basis of Presentation (Policies)	9 Months Ended
	Sep. 30, 2023
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Basis of Presentation	Basis of Presentation The unaudited interim condensed consolidated financial statements have been prepared in conformity with accounting principles generally accepted in the United States of America (GAAP). In management’s opinion, all material adjustments necessary for a fair statement of the financial condition, results of operations and cash flows of the Company, including its consolidated variable interest entities (VIEs), are reflected in the periods presented and are of a normal, recurring nature. The preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities as of the date of the financial statements and the reported amounts of revenues and expenses during the reporting period. Actual results could differ from those estimates. These unaudited interim condensed consolidated financial statements are as of September 30, 2023 and cover third quarter 2023, the three-month period ended September 30, 2022 (third quarter 2022), nine months 2023 and the nine-month period ended September 30, 2022 (nine months 2022). Certain financial information that is normally included in annual financial statements prepared in accordance with GAAP, but is not required for interim reporting purposes, has been condensed
Consolidation	The unaudited interim condensed consolidated financial statements include the accounts of AGL, its direct and indirect subsidiaries, and its consolidated financial guaranty VIEs (FG VIEs) and CIVs. See Note 8, Financial Guaranty Variable Interest Entities and Consolidated Investment Vehicles. Intercompany accounts and transactions between and among all consolidated entities have been eliminated.
Recent Accounting Standards Adopted	Recent Accounting Standards Adopted Targeted Improvements to the Accounting for Long-Duration Contracts In August 2018, the Financial Accounting Standards Board (FASB) issued Accounting Standards Update (ASU) 2018-12, Financial Services - Insurance (Topic 944): Targeted Improvements to the Accounting for Long-Duration Contracts . The Company’s adoption of this ASU on January 1, 2023 did not have any effect on the Company’s consolidated financial statements.
Segment Information	The Company reports its results of operations in two segments: Insurance and Asset Management, separate from its Corporate division and the effects of consolidating FG VIEs and CIVs, which is consistent with the manner in which the Company’s chief operating decision maker (CODM) reviews the business to assess performance and allocate resources.
Fair Value Measurement	The Company carries a significant portion of its assets and liabilities at fair value. Fair value is defined as the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date (i.e., exit price). The price represents the price available in the principal market for the asset or liability. If there is no principal market, then the price is based on a hypothetical market that maximizes the value received for an asset or minimizes the amount paid for a liability (i.e., the most advantageous market). Fair value is based on quoted market prices, where available. If listed prices or quotes are not available, fair value is based on either internally developed models that primarily use, as inputs, market-based or independently sourced market parameters, including but not limited to yield curves, interest rates and debt prices or with the assistance of an independent third party using a discounted cash flow approach and the third party’s proprietary pricing models. In addition to market information, models also incorporate transaction details, such as maturity of the instrument and contractual features designed to reduce the Company’s credit exposure, such as collateral rights as applicable. Valuation adjustments may be made to ensure that financial instruments are recorded at fair value. These adjustments include amounts to reflect counterparty credit quality, the Company’s creditworthiness and constraints on liquidity. As markets and products develop and the pricing for certain products becomes more or less transparent, the Company may refine its methodologies and assumptions. During nine months 2023, no changes were made to the Company’s valuation models that had, or are expected to have, a material impact on the Company’s condensed consolidated balance sheets or statements of operations and comprehensive income. The Company’s valuation methods produce fair values that may not be indicative of net realizable value or future fair values. The use of different methodologies or assumptions to determine fair value of certain financial instruments could result in a materially different estimate of fair value at the reporting date. The categorization within the fair value hierarchy is determined based on whether the inputs to valuation techniques used to measure fair value are observable or unobservable. Observable inputs reflect market data obtained from independent sources, while unobservable inputs reflect Company estimates of market assumptions. The fair value hierarchy prioritizes model inputs into three broad levels, with Level 1 being the highest and Level 3 the lowest. An asset’s or liability’s categorization within the hierarchy is based on the lowest level of significant input to its valuation. Level 1—Quoted prices for identical instruments in active markets. The Company generally defines an active market as a market in which trading occurs at significant volumes. Active markets generally are more liquid and have a lower bid-ask spread than an inactive market. Level 2—Quoted prices for similar instruments in active markets; quoted prices for identical or similar instruments in markets that are not active; and observable inputs other than quoted prices, such as interest rates or yield curves and other inputs derived from or corroborated by observable market inputs. Level 3—Model derived valuations in which one or more significant inputs or significant value drivers are unobservable. Financial instruments are considered Level 3 when their values are determined using pricing models, discounted cash flow methodologies or similar techniques and at least one significant model assumption or input is unobservable. Level 3 financial instruments also include those for which the determination of fair value requires significant management judgment or estimation.

Business and Basis of Present_3

Business and Basis of Presentation (Tables)	9 Months Ended
	Sep. 30, 2023
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Equity Method Investments	Upon closing of the Sound Point Transaction and the AHP Transaction the Company deconsolidated most of the corresponding AssuredIM entities (which had previously been classified as held-for-sale) and reported an investment in Sound Point that is accounted for under the equity method. In connection with the Sound Point Transaction and AHP Transaction, the Company reevaluated its consolidation conclusion for each consolidated investment vehicle (CIV) and deconsolidated all but three CIVs. See Note 8, Financial Guaranty Variable Interest Entities and Consolidated Investment Vehicles. The following table presents the calculation of the gain associated with the Sound Point Transaction and AHP Transaction. Gain on Sound Point Transaction and AHP Transaction (in millions) Fair value of investment in Sound Point $ 419 Fair value of other consideration 25 Total consideration 444 Less net asset carrying value of transferred AssuredIM subsidiaries (1) 189 Gain on sale of asset management subsidiaries (2) $ 255 ____________________ (1) Consists primarily of goodwill and intangible assets of $155 million. (2) Consists of a $248 million gain on the Sound Point Transaction, and a $7 million gain on the AHP Transaction, which were both reported in the corporate division.

Segment Information (Tables)

Segment Information (Tables)	9 Months Ended
	Sep. 30, 2023
Segment Reporting [Abstract]
Schedule of Segment Reporting Information, by Segment	The following table presents information for the Company’s operating segments. Intersegment revenues include transactions between and among the segments, the corporate division and other. Segment Information Third Quarter 2023 2022 Insurance Asset Management Insurance Asset Management (in millions) Third-party revenues $ 206 $ — $ 145 $ 13 Intersegment revenues 2 — 2 8 Segment revenues 208 — 147 21 Segment expenses 165 — (16) 24 Segment equity in earnings (losses) of investees 25 — (11) — Less: Segment provision (benefit) for income taxes 9 — (7) — Segment adjusted operating income (loss) $ 59 $ — $ 159 $ (3) Nine Months 2023 2022 Insurance Asset Management Insurance Asset Management (in millions) Third-party revenues $ 615 $ 44 $ 558 $ 59 Intersegment revenues 7 27 6 29 Segment revenues 622 71 564 88 Segment expenses 354 75 147 91 Segment equity in earnings (losses) of investees 60 — (46) — Less: Segment provision (benefit) for income taxes 46 (1) 24 — Segment adjusted operating income (loss) $ 282 $ (3) $ 347 $ (3)
Reconciliation of Other Significant Reconciling Items from Segments to Consolidated	The tables below present a reconciliation of significant components of segment information to the comparable consolidated amounts. Reconciliation of Segment Information to Consolidated Information Three Months Ended September 30, 2023 Equity in Earnings (Losses) of Investees Less: Net Income (Loss) Attributable to AGL Revenues Expenses Provision (Benefit) for Income Taxes Noncontrolling Interests (in millions) Segments: Insurance $ 208 $ 165 $ 25 $ 9 $ — $ 59 Asset Management — — — — — — Total segments 208 165 25 9 — 59 Corporate division 259 57 — 47 — 155 Other (4) (3) (7) (2) 2 (8) Subtotal 463 219 18 54 2 206 Reconciling items: Realized gains (losses) on investments (9) — — — — (9) Non-credit impairment-related unrealized fair value gains (losses) on credit derivatives 6 — — — — 6 Fair value gains (losses) on CCS (20) — — — — (20) Foreign exchange gains (losses) on remeasurement of premiums receivable and loss and LAE reserves (37) — — — — (37) Tax effect — — — (11) — 11 Total consolidated $ 403 $ 219 $ 18 $ 43 $ 2 $ 157 Reconciliation of Segment Information to Consolidated Information Three Months Ended September 30, 2022 Equity in Earnings (Losses) of Investees Less: Net Income (Loss) Attributable to AGL Revenues Expenses Provision (Benefit) for Income Taxes Noncontrolling Interests (in millions) Segments: Insurance $ 147 $ (16) $ (11) $ (7) $ — $ 159 Asset Management 21 24 — — — (3) Total segments 168 8 (11) (7) — 156 Corporate division 1 34 — (3) — (30) Other 13 2 (9) 1 (6) 7 Subtotal 182 44 (20) (9) (6) 133 Reconciling items: Realized gains (losses) on investments (14) — — — — (14) Non-credit impairment-related unrealized fair value gains (losses) on credit derivatives (50) (1) — — — (49) Fair value gains (losses) on CCS 1 — — — — 1 Foreign exchange gains (losses) on remeasurement of premiums receivable and loss and LAE reserves (78) — — — — (78) Tax effect — — — (18) — 18 Total consolidated $ 41 $ 43 $ (20) $ (27) $ (6) $ 11 Reconciliation of Segment Information to Consolidated Information Nine Months Ended September 30, 2023 Equity in Earnings (Losses) of Investees Less: Net Income (Loss) Attributable to AGL Revenues Expenses Provision (Benefit) for Income Taxes Noncontrolling Interests (in millions) Segments: Insurance $ 622 $ 354 $ 60 $ 46 $ — $ 282 Asset Management 71 75 — (1) — (3) Total segments 693 429 60 45 — 279 Corporate division 263 165 — 37 — 61 Other 28 12 (35) (8) 19 (30) Subtotal 984 606 25 74 19 310 Reconciling items: Realized gains (losses) on investments (20) — — — — (20) Non-credit impairment-related unrealized fair value gains (losses) on credit derivatives 108 (1) — — — 109 Fair value gains (losses) on CCS (35) — — — — (35) Foreign exchange gains (losses) on remeasurement of premiums receivable and loss and LAE reserves 9 — — — — 9 Tax effect — — — 10 — (10) Total consolidated $ 1,046 $ 605 $ 25 $ 84 $ 19 $ 363 Reconciliation of Segment Information to Consolidated Information Nine Months Ended September 30, 2022 Equity in Earnings (Losses) of Investees Less: Net Income (Loss) Attributable to AGL Revenues Expenses Provision (Benefit) for Income Taxes Noncontrolling Interests (in millions) Segments: Insurance $ 564 $ 147 $ (46) $ 24 $ — $ 347 Asset Management 88 91 — — — (3) Total segments 652 238 (46) 24 — 344 Corporate division 3 104 — (3) — (98) Other 34 14 15 3 25 7 Subtotal 689 356 (31) 24 25 253 Reconciling items: Realized gains (losses) on investments (39) — — — — (39) Non-credit impairment-related unrealized fair value gains (losses) on credit derivatives (51) (5) — — — (46) Fair value gains (losses) on CCS 12 — — — — 12 Foreign exchange gains (losses) on remeasurement of premiums receivable and loss and LAE reserves (180) — — — — (180) Tax effect — — — (30) — 30 Total consolidated $ 431 $ 351 $ (31) $ (6) $ 25 $ 30

Outstanding Exposure (Tables)

Outstanding Exposure (Tables)	9 Months Ended
	Sep. 30, 2023
Outstanding Exposure Disclosure [Abstract]
Debt Service Outstanding	Financial Guaranty Portfolio Debt Service and Par Outstanding As of September 30, 2023 As of December 31, 2022 Gross Net Gross Net (in millions) Debt Service Public finance $ 372,908 $ 372,711 $ 359,899 $ 359,703 Structured finance 11,290 11,265 10,273 10,248 Total financial guaranty $ 384,198 $ 383,976 $ 370,172 $ 369,951 Par Outstanding Public finance $ 231,871 $ 231,721 $ 224,254 $ 224,099 Structured finance 10,138 10,112 9,184 9,159 Total financial guaranty $ 242,009 $ 241,833 $ 233,438 $ 233,258
Financial Guaranty Portfolio by Internal Rating	Financial Guaranty Portfolio by Internal Rating As of September 30, 2023 Public Finance Public Finance Structured Finance Structured Finance Total Rating Net Par % Net Par % Net Par % Net Par % Net Par % (dollars in millions) AAA $ 212 0.1 % $ 2,004 4.4 % $ 860 9.6 % $ 457 40.2 % $ 3,533 1.5 % AA 16,994 9.1 3,298 7.2 4,545 50.7 12 1.0 24,849 10.3 A 101,243 54.5 10,545 23.1 1,932 21.5 568 50.0 114,288 47.2 BBB 64,220 34.5 29,083 63.5 586 6.5 100 8.8 93,989 38.9 BIG 3,304 1.8 818 1.8 1,052 11.7 — — 5,174 2.1 Total net par outstanding $ 185,973 100.0 % $ 45,748 100.0 % $ 8,975 100.0 % $ 1,137 100.0 % $ 241,833 100.0 % Financial Guaranty Portfolio by Internal Rating As of December 31, 2022 Public Finance Public Finance Structured Finance Structured Finance Total Rating Net Par % Net Par % Net Par % Net Par % Net Par % (dollars in millions) AAA $ 222 0.1 % $ 1,967 4.4 % $ 926 11.2 % $ 469 50.4 % $ 3,584 1.5 % AA 16,241 9.1 3,497 7.9 4,633 56.3 12 1.3 24,383 10.5 A 96,807 53.9 9,271 20.9 1,075 13.1 340 36.5 107,493 46.1 BBB 62,570 34.8 28,747 64.6 479 5.8 110 11.8 91,906 39.4 BIG 3,796 2.1 981 2.2 1,115 13.6 — — 5,892 2.5 Total net par outstanding $ 179,636 100.0 % $ 44,463 100.0 % $ 8,228 100.0 % $ 931 100.0 % $ 233,258 100.0 %
Schedule of BIG Net Par Outstanding and Number of Risks	Financial Guaranty Portfolio Components of BIG Net Par Outstanding As of September 30, 2023 BIG Net Par Outstanding Net Par BIG 1 BIG 2 BIG 3 Total BIG Outstanding (in millions) Public finance: U.S. public finance $ 1,290 $ 926 $ 1,088 $ 3,304 $ 185,973 Non-U.S. public finance 818 — — 818 45,748 Public finance 2,108 926 1,088 4,122 231,721 Structured finance: U.S. RMBS 23 36 897 956 1,817 Other structured finance — 28 68 96 8,295 Structured finance 23 64 965 1,052 10,112 Total $ 2,131 $ 990 $ 2,053 $ 5,174 $ 241,833 Financial Guaranty Portfolio Components of BIG Net Par Outstanding As of December 31, 2022 BIG Net Par Outstanding Net Par BIG 1 BIG 2 BIG 3 Total BIG Outstanding (in millions) Public finance: U.S. public finance $ 2,364 $ 108 $ 1,324 $ 3,796 $ 179,636 Non-U.S. public finance 981 — — 981 44,463 Public finance 3,345 108 1,324 4,777 224,099 Structured finance: U.S. RMBS 18 39 953 1,010 1,956 Other structured finance — 34 71 105 7,203 Structured finance 18 73 1,024 1,115 9,159 Total $ 3,363 $ 181 $ 2,348 $ 5,892 $ 233,258
BIG Net Par Outstanding and Number of Risks	Financial Guaranty Portfolio BIG Net Par Outstanding and Number of Risks As of September 30, 2023 Net Par Outstanding Number of Risks (2) Description Financial Credit Total Financial Credit Total (dollars in millions) BIG 1 $ 2,115 $ 16 $ 2,131 102 2 104 BIG 2 980 10 990 13 2 15 BIG 3 2,024 29 2,053 109 7 116 Total BIG $ 5,119 $ 55 $ 5,174 224 11 235 Financial Guaranty Portfolio BIG Net Par Outstanding and Number of Risks As of December 31, 2022 Net Par Outstanding Number of Risks (2) Description Financial Credit Total Financial Credit Total (dollars in millions) BIG 1 $ 3,357 $ 6 $ 3,363 122 1 123 BIG 2 171 10 181 14 2 16 BIG 3 2,307 41 2,348 111 10 121 Total BIG $ 5,835 $ 57 $ 5,892 247 13 260 _____________________ (1) Includes FG VIEs. (2) A risk represents the aggregate of the financial guaranty policies that share the same revenue source for purposes of making debt service payments. Amortization Schedule of Puerto Rico Net Par Outstanding and Net Debt Service Outstanding As of September 30, 2023 Scheduled Net Par Amortization Scheduled Net Debt Service Amortization (in millions) 2023 (October 1 - December 31) $ — $ 3 2024 (January 1 - March 31) — 24 2024 (April 1 - June 30) — 3 2024 (July 1 - September 30) 110 134 2024 (October 1 - December 31) — 3 Subtotal 2024 110 164 2025 84 132 2026 140 185 2027 120 158 2028-2032 293 427 2033-2037 235 302 2038-2041 123 140 Total $ 1,105 $ 1,511 The following tables provide information on financial guaranty insurance contracts categorized as BIG. Financial Guaranty Insurance BIG Transaction Loss Summary As of September 30, 2023 Gross Net Total BIG BIG 1 BIG 2 BIG 3 Total BIG (dollars in millions) Number of risks (1) 102 13 109 224 224 Remaining weighted-average period (in years) 9.8 16.1 7.7 10.2 10.2 Outstanding exposure: Par $ 2,121 $ 980 $ 2,033 $ 5,134 $ 5,119 Interest 1,125 922 824 2,871 2,867 Total (2) $ 3,246 $ 1,902 $ 2,857 $ 8,005 $ 7,986 Expected cash outflows (inflows) $ 113 $ 180 $ 1,621 $ 1,914 $ 1,903 Potential recoveries (3) (324) (78) (1,223) (1,625) (1,615) Subtotal (211) 102 398 289 288 Discount 60 (25) (74) (39) (39) Expected losses to be paid (recovered) $ (151) $ 77 $ 324 $ 250 $ 249 Deferred premium revenue $ 96 $ 64 $ 146 $ 306 $ 306 Reserves (salvage) $ (178) $ 37 $ 215 $ 74 $ 74 Financial Guaranty Insurance BIG Transaction Loss Summary As of December 31, 2022 Gross Net Total BIG BIG 1 BIG 2 BIG 3 Total BIG (dollars in millions) Number of risks (1) 122 14 111 247 247 Remaining weighted-average period (in years) 11.3 8.7 7.6 9.8 9.8 Outstanding exposure: Par $ 3,363 $ 171 $ 2,318 $ 5,852 $ 5,835 Interest 2,177 77 894 3,148 3,144 Total (2) $ 5,540 $ 248 $ 3,212 $ 9,000 $ 8,979 Expected cash outflows (inflows) $ 128 $ 121 $ 1,771 $ 2,020 $ 2,008 Potential recoveries (3) (294) (79) (1,364) (1,737) (1,725) Subtotal (166) 42 407 283 283 Discount 35 (13) (104) (82) (82) Expected losses to be paid (recovered) $ (131) $ 29 $ 303 $ 201 $ 201 Deferred premium revenue $ 170 $ 15 $ 160 $ 345 $ 345 Reserves (salvage) $ (174) $ 21 $ 186 $ 33 $ 33 ____________________ (1) A risk represents the aggregate of the financial guaranty policies that share the same revenue source for purposes of making debt service payments. (2) Includes amounts related to FG VIEs. (3) Represents expected inflows from future payments by obligors pursuant to restructuring agreements, settlements, excess spread on any underlying collateral and other estimated recoveries. Potential recoveries also include recoveries on certain investment grade credits, related mainly to exposures that were previously BIG and for which claims have been paid in the past.
Gross Par and Gross Debt Service Outstanding	All Puerto Rico exposures are internally rated BIG. The following tables show the Company’s insured exposure to general obligation bonds of Puerto Rico and various obligations of its related authorities and public corporations. Puerto Rico Gross Par and Gross Debt Service Outstanding Gross Par Outstanding Gross Debt Service Outstanding As of As of September 30, 2023 December 31, 2022 September 30, 2023 December 31, 2022 (in millions) Exposure to Puerto Rico $ 1,121 $ 1,378 $ 1,529 $ 1,899
Schedule of Geographic Exposure of Net Par Outstanding	Puerto Rico Net Par Outstanding As of September 30, 2023 December 31, 2022 (in millions) Defaulted Puerto Rico Exposures PREPA $ 624 $ 720 Total Defaulted 624 720 Resolved Puerto Rico Exposures PRHTA (Transportation revenue) (1) 244 298 PRHTA (Highway revenue) (1) 128 182 Commonwealth of Puerto Rico - GO (1) — 25 PBA (1) — 4 Total Resolved 372 509 Other Puerto Rico Exposures MFA (2) 108 131 PRASA and U of PR (2) 1 1 Total Other 109 132 Total net exposure to Puerto Rico $ 1,105 $ 1,361 ____________________ (1) Resolved pursuant to the 2022 Puerto Rico Resolutions. (2) All debt service on these insured exposures have been paid to date without any insurance claim being made on the Company.
Schedule of Non-Financial Guaranty Exposure	Specialty Business As of September 30, 2023 As of December 31, 2022 Gross Exposure Net Exposure Gross Exposure Net Exposure (in millions) Life insurance transactions (1) $ 1,325 $ 1,003 $ 1,314 $ 986 Aircraft residual value insurance policies 355 200 355 200 Other guaranties 2,090 2,090 228 228 ____________________ (1) The life insurance transactions net exposure is projected to reach $1.1 billion in 2024.

Expected Loss to be Paid (Rec_2

Expected Loss to be Paid (Recovered) (Tables)	9 Months Ended
	Sep. 30, 2023
Expected Losses [Abstract]
Net Expected Loss to be Paid By Accounting Model	Net Expected Loss to be Paid (Recovered) and Net Economic Loss Development (Benefit) by Accounting Model Net Expected Loss to be Paid (Recovered) Net Economic Loss Development (Benefit) As of Third Quarter Nine Months Accounting Model September 30, 2023 December 31, 2022 2023 2022 2023 2022 (in millions) Insurance (see Note 5) $ 252 $ 205 $ 92 $ (67) $ 160 $ (137) FG VIEs (see Note 8) (1) 235 314 (6) (6) (15) (16) Credit derivatives (see Note 6) 3 3 1 1 2 5 Total $ 490 $ 522 $ 87 $ (72) $ 147 $ (148) ____________________ (1) The net expected loss to be paid for FG VIEs primarily relates to trusts established as part of the 2022 Puerto Rico Resolutions (Puerto Rico Trusts) that were consolidated.
Net Expected Loss to be Paid After Net Expected Recoveries for Breaches of R&W Roll Forward	The following tables present a roll forward of net expected loss to be paid (recovered) for all contracts, which are accounted for under one of the following accounting models: insurance, derivative and FG VIE. The Company used risk-free rates for U.S. dollar denominated obligations that ranged from 4.51% to 5.45% with a weighted average of 4.80% as of September 30, 2023 and 3.82% to 4.69% with a weighted average of 4.08% as of December 31, 2022. Net expected losses to be paid for U.S. dollar denominated transactions represented approximately 98.2% and 98.5% of the total as of September 30, 2023 and December 31, 2022, respectively. Net Expected Loss to be Paid (Recovered) Roll Forward Third Quarter Nine Months 2023 2022 2023 2022 (in millions) Net expected loss to be paid (recovered), beginning of period $ 560 $ 442 $ 522 $ 411 Economic loss development (benefit) due to: Accretion of discount 6 3 15 8 Changes in discount rates (12) (25) (8) (114) Changes in timing and assumptions 93 (50) 140 (42) Total economic loss development (benefit) 87 (72) 147 (148) Net (paid) recovered losses (1) (157) 357 (179) 464 Net expected loss to be paid (recovered), end of period $ 490 $ 727 $ 490 $ 727 ____________________ (1) Net (paid) recovered losses in 2023 include recoveries related to various Puerto Rico securities transferred to the Company's investment portfolio upon the maturity and extinguishment of certain GO, PBA and HTA insured exposure. Net (paid) recovered losses in 2022 include the net amounts received pursuant to the 2022 Puerto Rico Resolutions, as described in Note 3, Outstanding Exposure. Net Expected Loss to be Paid (Recovered) Roll Forward by Sector Third Quarter 2023 Sector Net Expected Loss to be Paid (Recovered) as of June 30, 2023 Net Economic Loss Net (Paid) Recovered Losses (1) Net Expected Loss to be Paid (Recovered) as of September 30, 2023 (in millions) Public finance: U.S. public finance $ 433 $ 135 $ (169) $ 399 Non-U.S. public finance 10 (1) — 9 Public finance 443 134 (169) 408 Structured finance: U.S. RMBS 73 (48) 13 38 Other structured finance 44 1 (1) 44 Structured finance 117 (47) 12 82 Total $ 560 $ 87 $ (157) $ 490 Third Quarter 2022 Sector Net Expected Loss to be Paid (Recovered) as of June 30, 2022 Net Economic Loss Net (Paid) Recovered Losses (1) Net Expected Loss to be Paid (Recovered) as of September 30, 2022 (in millions) Public finance: U.S. public finance $ 210 $ 24 $ 392 $ 626 Non-U.S. public finance 7 (2) 1 6 Public finance 217 22 393 632 Structured finance: U.S. RMBS 179 (95) (32) 52 Other structured finance 46 1 (4) 43 Structured finance 225 (94) (36) 95 Total $ 442 $ (72) $ 357 $ 727 Nine Months 2023 Sector Net Expected Loss to be Paid (Recovered) as of December 31, 2022 Net Economic Loss Net (Paid) Recovered Losses (1) Net Expected Loss to be Paid (Recovered) as of September 30, 2023 (in millions) Public finance: U.S. public finance $ 403 $ 193 $ (197) $ 399 Non-U.S. public finance 9 — — 9 Public finance 412 193 (197) 408 Structured finance: U.S. RMBS 66 (52) 24 38 Other structured finance 44 6 (6) 44 Structured finance 110 (46) 18 82 Total $ 522 $ 147 $ (179) $ 490 Nine Months 2022 Sector Net Expected Loss to be Paid (Recovered) as of December 31, 2021 Net Economic Loss Net (Paid) Recovered Losses (1) Net Expected Loss to be Paid (Recovered) as of September 30, 2022 (in millions) Public finance: U.S. public finance $ 197 $ (16) $ 445 $ 626 Non-U.S. public finance 12 (6) — 6 Public finance 209 (22) 445 632 Structured finance: U.S. RMBS 150 (127) 29 52 Other structured finance 52 1 (10) 43 Structured finance 202 (126) 19 95 Total $ 411 $ (148) $ 464 $ 727 ____________________ (1) Net of ceded paid losses, whether or not such amounts have been settled with reinsurers. Ceded paid losses are typically settled 45 days after the end of the reporting period. Such amounts are recorded as reinsurance recoverable on paid losses in “other assets.”
Schedule Of Net Expected Losses To Be Paid (Recovered) And Net Economic Development (Benefit) Loss	The assumptions that the Company uses to project RMBS losses are shown in the sections below. Net Economic Loss Development (Benefit) U.S. RMBS Third Quarter Nine Months 2023 2022 2023 2022 (in millions) First lien U.S. RMBS $ (12) $ (38) $ (12) $ (34) Second lien U.S. RMBS (36) (57) (40) (93)
Liquidation Rates and Key Assumptions in Base Case Expected Loss Estimates First Lien RMBS	The following table shows liquidation assumptions for various non-performing and re-performing categories. First Lien U.S. RMBS Liquidation Rates As of September 30, 2023 December 31, 2022 Current but recently delinquent Alt-A and Prime 20% 20% Option ARM 20% 20% Subprime 20% 20% 30 – 59 Days Delinquent Alt-A and Prime 35% 35% Option ARM 35% 35% Subprime 30% 30% 60 – 89 Days Delinquent Alt-A and Prime 40% 40% Option ARM 45% 45% Subprime 40% 40% 90+ Days Delinquent Alt-A and Prime 55% 55% Option ARM 60% 60% Subprime 45% 45% Bankruptcy Alt-A and Prime 45% 45% Option ARM 50% 50% Subprime 40% 40% Foreclosure Alt-A and Prime 60% 60% Option ARM 65% 65% Subprime 55% 55% Real Estate Owned All 100% 100% The following table shows the range as well as the average, weighted by outstanding net insured par, for key assumptions used in the calculation of expected loss to be paid (recovered) for individual transactions for vintage 2004 - 2008 first lien U.S. RMBS. Key Assumptions in Base Scenario Expected Loss Estimates First Lien U.S. RMBS As of September 30, 2023 As of December 31, 2022 Range Weighted Average Range Weighted Average Alt-A and Prime: Plateau CDR 0.3 % - 9.7% 3.8% 1.6 % - 11.5% 5.1% Final CDR 0.0 % - 0.5% 0.2% 0.1 % - 0.6% 0.3% Initial loss severity: 2005 and prior 50% 50% 2006 50% 50% 2007+ 50% 50% Option ARM: Plateau CDR 0.0 % - 9.2% 3.6% 2.0 % - 7.7% 4.3% Final CDR 0.0 % - 0.5% 0.2% 0.1 % - 0.4% 0.2% Initial loss severity: 2005 and prior 50% 50% 2006 50% 50% 2007+ 50% 50% Subprime: Plateau CDR 0.2 % - 9.6% 4.7% 2.7 % - 9.7% 5.6% Final CDR 0.0 % - 0.5% 0.2% 0.1 % - 0.5% 0.3% Initial loss severity: 2005 and prior 50% 50% 2006 50% 50% 2007+ 50% 50%
Key Assumptions in Base Case Expected Loss Estimates Second Lien RMBS	The following table shows the range as well as the average, weighted by net par outstanding, for key assumptions used in the calculation of expected loss to be paid (recovered) for individual transactions for vintage 2004 - 2008 HELOCs. Key Assumptions in Base Scenario Expected Loss Estimates HELOCs As of September 30, 2023 As of December 31, 2022 Range Weighted Average Range Weighted Average Plateau CDR 0.4 % - 8.7% 2.7% 0.4 % - 8.4% 3.5% Final CDR trended down to 0.0 % - 0.4% 0.1% 0.0 % - 0.4% 0.2% Liquidation rates: Current but recently delinquent 20% 20% 30 – 59 Days Delinquent 30 30 60 – 89 Days Delinquent 40 40 90+ Days Delinquent 60 60 Bankruptcy 55 55 Foreclosure 55 55 Real Estate Owned 100 100 Loss severity on future defaults 98% 98% Projected future recoveries on previously charged-off loans 40% 30%

Contracts Accounted for as In_2

Contracts Accounted for as Insurance (Tables)	9 Months Ended
	Sep. 30, 2023
Insurance [Abstract]
Net Earned Premiums	Net Earned Premiums Third Quarter Nine Months 2023 2022 2023 2022 (in millions) Financial guaranty insurance: Scheduled net earned premiums $ 73 $ 70 $ 212 $ 219 Accelerations from refundings and terminations (1) 14 12 26 145 Accretion of discount on net premiums receivable 7 6 20 18 Financial guaranty insurance net earned premiums 94 88 258 382 Specialty net earned premiums 1 1 3 3 Net earned premiums $ 95 $ 89 $ 261 $ 385 ____________________
Gross Premium Receivable, Net of Commissions on Assumed Business Roll Forward	Gross Premium Receivable, Net of Commissions Payable on Assumed Business Roll Forward Nine Months 2023 2022 (in millions) Beginning of year $ 1,298 $ 1,372 Less: Specialty insurance premium receivable 1 1 Financial guaranty insurance premiums receivable 1,297 1,371 Gross written premiums on new business, net of commissions 215 232 Gross premiums received, net of commissions (170) (258) Adjustments: Changes in the expected term and debt service assumptions 4 (5) Accretion of discount, net of commissions on assumed business 20 18 Foreign exchange gain (loss) on remeasurement 9 (181) Financial guaranty insurance premium receivable 1,375 1,177 Specialty insurance premium receivable 1 1 September 30, $ 1,376 $ 1,178 Financial Guaranty Insurance Expected Future Premium Collections and Earnings As of September 30, 2023 Future Gross Premiums Future Net Premiums (in millions) 2023 (October 1 - December 31) $ 45 $ 72 2024 134 277 2025 104 259 2026 100 243 2027 97 230 2028-2032 402 958 2033-2037 264 635 2038-2042 182 390 After 2042 360 537 Total $ 1,688 3,601 Future accretion 313 Total future net earned premiums $ 3,914 ____________________ (1) Net of assumed commissions payable. (2) Net of reinsurance.
Selected Information for Policies Paid in Installments	Selected Information for Financial Guaranty Insurance Policies with Premiums Paid in Installments As of September 30, 2023 December 31, 2022 (dollars in millions) Premiums receivable, net of commissions payable $ 1,375 $ 1,297 Deferred premium revenue 1,702 1,663 Weighted-average risk-free rate used to discount premiums 1.9% 1.8% Weighted-average period of premiums receivable (in years) 12.2 12.9
Loss and LAE Reserve and Salvage and Subrogation Recoverable Net of Reinsurance Insurance Contracts	The following tables provide information on net reserve (salvage), which includes loss and LAE reserves and salvage and subrogation recoverable, both net of reinsurance. Net Reserve (Salvage) by Sector As of Sector September 30, 2023 December 31, 2022 (in millions) Public finance: U.S. public finance $ 123 $ 71 Non-U.S. public finance 1 1 Public finance 124 72 Structured finance: U.S. RMBS (89) (77) Other structured finance 42 42 Structured finance (47) (35) Total $ 77 $ 37
Reconciliation of Net Expected Loss to be Paid and Net Expected Loss to be Expensed Financial Guaranty Insurance Contracts	The table below provides a reconciliation of net expected loss to be paid (recovered) for financial guaranty insurance contracts to net expected loss to be expensed. Expected loss to be paid (recovered) for financial guaranty insurance contracts differs from expected loss to be expensed due to: (i) the contra-paid, which represents the claim payments made and recoveries received that have not yet been recognized in the statements of operations; (ii) salvage and subrogation recoverable for transactions that are in a net recovery position where the Company has not yet received recoveries on claims previously paid (and therefore recognized in income but not yet received); and (iii) loss reserves that have already been established (and therefore expensed but not yet paid). Reconciliation of Net Expected Loss to be Paid (Recovered) to Net Expected Loss to be Expensed Financial Guaranty Insurance Contracts As of September 30, 2023 (in millions) Net expected loss to be paid (recovered) - financial guaranty insurance $ 249 Contra-paid, net 21 Salvage and subrogation recoverable, net 281 Loss and LAE reserve - financial guaranty insurance contracts, net of reinsurance (355) Net expected loss to be expensed (present value) $ 196
Net Expected Loss to be Expensed Insurance Contracts	The following table provides a schedule of the expected timing of net expected losses to be expensed. The amount and timing of actual loss and LAE may differ from the estimates shown below due to factors such as accelerations, commutations, changes in expected lives and updates to loss estimates. This table excludes amounts related to FG VIEs, which are eliminated in consolidation. Net Expected Loss to be Expensed Financial Guaranty Insurance Contracts As of September 30, 2023 (in millions) 2023 (October 1 - December 31) $ 2 2024 13 2025 12 2026 15 2027 16 2028-2032 63 2033-2037 49 2038-2042 13 After 2042 13 Net expected loss to be expensed 196 Future accretion 39 Total expected future loss and LAE $ 235
Loss and LAE Reported on the Consolidated Statements of Operations	The following table presents the loss and LAE (benefit) reported in the condensed consolidated statements of operations by sector for insurance contracts. Amounts presented are net of reinsurance. Loss and LAE (Benefit) by Sector Third Quarter Nine Months Sector 2023 2022 2023 2022 (in millions) Public finance: U.S. public finance $ 134 $ 1 $ 186 $ 67 Non-U.S. public finance — — — — Public finance 134 1 186 67 Structured finance: U.S. RMBS (35) (78) $ (31) $ (97) Other structured finance 1 2 4 1 Structured finance (34) (76) (27) (96) Loss and LAE (benefit) $ 100 $ (75) $ 159 $ (29)
BIG Net Par Outstanding and Number of Risks	Financial Guaranty Portfolio BIG Net Par Outstanding and Number of Risks As of September 30, 2023 Net Par Outstanding Number of Risks (2) Description Financial Credit Total Financial Credit Total (dollars in millions) BIG 1 $ 2,115 $ 16 $ 2,131 102 2 104 BIG 2 980 10 990 13 2 15 BIG 3 2,024 29 2,053 109 7 116 Total BIG $ 5,119 $ 55 $ 5,174 224 11 235 Financial Guaranty Portfolio BIG Net Par Outstanding and Number of Risks As of December 31, 2022 Net Par Outstanding Number of Risks (2) Description Financial Credit Total Financial Credit Total (dollars in millions) BIG 1 $ 3,357 $ 6 $ 3,363 122 1 123 BIG 2 171 10 181 14 2 16 BIG 3 2,307 41 2,348 111 10 121 Total BIG $ 5,835 $ 57 $ 5,892 247 13 260 _____________________ (1) Includes FG VIEs. (2) A risk represents the aggregate of the financial guaranty policies that share the same revenue source for purposes of making debt service payments. Amortization Schedule of Puerto Rico Net Par Outstanding and Net Debt Service Outstanding As of September 30, 2023 Scheduled Net Par Amortization Scheduled Net Debt Service Amortization (in millions) 2023 (October 1 - December 31) $ — $ 3 2024 (January 1 - March 31) — 24 2024 (April 1 - June 30) — 3 2024 (July 1 - September 30) 110 134 2024 (October 1 - December 31) — 3 Subtotal 2024 110 164 2025 84 132 2026 140 185 2027 120 158 2028-2032 293 427 2033-2037 235 302 2038-2041 123 140 Total $ 1,105 $ 1,511 The following tables provide information on financial guaranty insurance contracts categorized as BIG. Financial Guaranty Insurance BIG Transaction Loss Summary As of September 30, 2023 Gross Net Total BIG BIG 1 BIG 2 BIG 3 Total BIG (dollars in millions) Number of risks (1) 102 13 109 224 224 Remaining weighted-average period (in years) 9.8 16.1 7.7 10.2 10.2 Outstanding exposure: Par $ 2,121 $ 980 $ 2,033 $ 5,134 $ 5,119 Interest 1,125 922 824 2,871 2,867 Total (2) $ 3,246 $ 1,902 $ 2,857 $ 8,005 $ 7,986 Expected cash outflows (inflows) $ 113 $ 180 $ 1,621 $ 1,914 $ 1,903 Potential recoveries (3) (324) (78) (1,223) (1,625) (1,615) Subtotal (211) 102 398 289 288 Discount 60 (25) (74) (39) (39) Expected losses to be paid (recovered) $ (151) $ 77 $ 324 $ 250 $ 249 Deferred premium revenue $ 96 $ 64 $ 146 $ 306 $ 306 Reserves (salvage) $ (178) $ 37 $ 215 $ 74 $ 74 Financial Guaranty Insurance BIG Transaction Loss Summary As of December 31, 2022 Gross Net Total BIG BIG 1 BIG 2 BIG 3 Total BIG (dollars in millions) Number of risks (1) 122 14 111 247 247 Remaining weighted-average period (in years) 11.3 8.7 7.6 9.8 9.8 Outstanding exposure: Par $ 3,363 $ 171 $ 2,318 $ 5,852 $ 5,835 Interest 2,177 77 894 3,148 3,144 Total (2) $ 5,540 $ 248 $ 3,212 $ 9,000 $ 8,979 Expected cash outflows (inflows) $ 128 $ 121 $ 1,771 $ 2,020 $ 2,008 Potential recoveries (3) (294) (79) (1,364) (1,737) (1,725) Subtotal (166) 42 407 283 283 Discount 35 (13) (104) (82) (82) Expected losses to be paid (recovered) $ (131) $ 29 $ 303 $ 201 $ 201 Deferred premium revenue $ 170 $ 15 $ 160 $ 345 $ 345 Reserves (salvage) $ (174) $ 21 $ 186 $ 33 $ 33 ____________________ (1) A risk represents the aggregate of the financial guaranty policies that share the same revenue source for purposes of making debt service payments. (2) Includes amounts related to FG VIEs. (3) Represents expected inflows from future payments by obligors pursuant to restructuring agreements, settlements, excess spread on any underlying collateral and other estimated recoveries. Potential recoveries also include recoveries on certain investment grade credits, related mainly to exposures that were previously BIG and for which claims have been paid in the past.

Contracts Accounted for as Cr_2

Contracts Accounted for as Credit Derivatives (Tables)	9 Months Ended
	Sep. 30, 2023
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Credit Derivatives Subordination and Ratings and Net Par Outstanding by Internal Rating	The components of the Company’s credit derivative net par outstanding by sector are presented in the table below. The estimated remaining weighted average life of credit derivatives was 11.4 years and 12.8 years as of September 30, 2023 and December 31, 2022, respectively. Credit Derivatives (1) As of September 30, 2023 As of December 31, 2022 Sector Net Par Net Fair Value Asset (Liability) Net Par Net Fair Value Asset (Liability) (in millions) U.S. public finance $ 1,074 $ (15) $ 1,175 $ (79) Non-U.S. public finance 1,478 (19) 1,565 (58) U.S. structured finance 327 (13) 342 (22) Non-U.S. structured finance 610 (2) 121 (3) Total $ 3,489 $ (49) $ 3,203 $ (162) ____________________ (1) Expected loss to be paid was $3 million as of both September 30, 2023 and December 31, 2022. Distribution of Credit Derivative Net Par Outstanding by Internal Rating As of September 30, 2023 As of December 31, 2022 Rating Category Net Par % of Total Net Par % of Total (dollars in millions) AAA $ 1,255 36.0 % $ 1,260 39.3 % AA 1,020 29.2 1,064 33.2 A 689 19.7 232 7.2 BBB 470 13.5 590 18.5 BIG 55 1.6 57 1.8 Credit derivative net par outstanding $ 3,489 100.0 % $ 3,203 100.0 %
Net Change in Fair Value of Credit Derivatives	Fair Value Gains (Losses) on Credit Derivatives Third Quarter Nine Months 2023 2022 2023 2022 (in millions) Realized gains (losses) and other settlements $ — $ (1) $ 1 $ (2) Net unrealized gains (losses) 9 (47) 114 (40) Fair value gains (losses) on credit derivatives $ 9 $ (48) $ 115 $ (42)
CDS Spread on AGC and AGM	CDS Spread on AGC (in basis points) As of September 30, As of December 31, 2022 As of September 30, As of December 31, 2021 Five-year CDS spread 98 63 70 49 One-year CDS spread 41 26 28 16
Fair Value of Credit Derivatives and Effect of AGC and AGM Credit Spreads	Fair Value of Credit Derivative Assets (Liabilities) and Effect of AGC Credit Spread As of September 30, 2023 December 31, 2022 (in millions) Fair value of credit derivatives before effect of AGC credit spread $ (80) $ (207) Plus: Effect of AGC credit spread 31 45 Net fair value of credit derivatives $ (49) $ (162)

Investments (Tables)

Investments (Tables)	9 Months Ended
	Sep. 30, 2023
Investments, Debt and Equity Securities [Abstract]
Marketable Securities	Investment Portfolio Carrying Value As of September 30, 2023 December 31, 2022 (in millions) Fixed-maturity securities, available-for-sale (1): Externally managed (2) $ 5,316 $ 5,824 Loss Mitigation Securities 495 548 Puerto Rico, New Recovery Bonds (3) 78 358 Other (4) 378 389 Fixed-maturity securities, trading - Puerto Rico, CVIs (3) 350 303 Short-term investments 1,426 810 Other invested assets: Equity method investments: Sound Point 419 — Alternative investments (5) 331 123 Other 15 10 Total $ 8,808 $ 8,365 ____________________ (1) 7.6% and 7.4% of fixed-maturity securities were rated BIG as of September 30, 2023 and December 31, 2022, respectively, consisting primarily of Loss Mitigation Securities. 2.4% and 5.9% were not rated, as of September 30, 2023 and December 31, 2022, respectively. (2) As of September 30, 2023 and December 31, 2022 amounts include $294 million and $305 million, respectively, of CLOs that had been managed internally by AssuredIM under an investment management agreement until it transitioned to an external manager in June 2023. (3) These securities are not rated. On August 31, 2023, the Company satisfied its obligations under certain Puerto Rico Trusts and as a result $68 million, at fair value, of Puerto Rico New Recovery Bonds and $5 million, at fair value, of CVIs were transferred from the consolidated Puerto Rico Trusts to AGC and AGM’s investment portfolios. See Note 3, Outstanding Exposure. (4) As of September 30, 2023 and December 31, 2022, amounts include $214 million and $232 million, respectively, of municipal bonds that had been managed by AssuredIM under an investment management agreement until June 2023, and are now managed by the U.S. Insurance Subsidiaries for their own accounts. (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.
Fixed Maturity Securities and Short Term Investments by Security Type	Available-for-Sale Fixed-Maturity Securities by Security Type As of September 30, 2023 Security Type Percent Amortized Allowance for Credit Losses Gross Gross Estimated (dollars in millions) Obligations of state and political subdivisions 42 % $ 2,938 $ (14) $ 20 $ (178) $ 2,766 U.S. government and agencies 1 65 — — (7) 58 Corporate securities (2) 33 2,321 (6) 1 (307) 2,009 Mortgage-backed securities (3): RMBS 6 430 (20) 2 (82) 330 Commercial mortgage-backed securities (CMBS) 3 198 — — (10) 188 Asset-backed securities: CLOs 7 463 — 1 (10) 454 Other 6 440 (46) 6 (31) 369 Non-U.S. government securities 2 116 — — (23) 93 Total available-for-sale fixed-maturity securities 100 % $ 6,971 $ (86) $ 30 $ (648) $ 6,267 Available-for-Sale Fixed-Maturity Securities by Security Type As of December 31, 2022 Security Type Percent Amortized Allowance for Credit Losses Gross Gross Estimated (dollars in millions) Obligations of state and political subdivisions 45 % $ 3,509 $ (14) $ 37 $ (138) $ 3,394 U.S. government and agencies 2 118 — 1 (8) 111 Corporate securities (2) 31 2,387 (6) 2 (299) 2,084 Mortgage-backed securities (3): RMBS 5 418 (19) 3 (62) 340 CMBS 4 282 — — (11) 271 Asset-backed securities: CLOs 6 449 — — (21) 428 Other 5 423 (26) 22 (26) 393 Non-U.S. government securities 2 121 — — (23) 98 Total available-for-sale fixed-maturity securities 100 % $ 7,707 $ (65) $ 65 $ (588) $ 7,119 ____________________ (1) Based on amortized cost. (2) Includes securities issued by taxable universities and hospitals.
Fixed-Maturity Securities Gross Unrealized Loss by Length of Time	Gross Unrealized Loss by Length of Time for Available-for-Sale Fixed-Maturity Securities for Which a Credit Loss was Not Recorded As of September 30, 2023 Less than 12 months 12 months or more Total Fair Gross Unrealized Fair Gross Unrealized Fair Gross Unrealized (dollars in millions) Obligations of state and political subdivisions $ 1,610 $ (39) $ 899 $ (136) $ 2,509 $ (175) U.S. government and agencies 21 — 32 (7) 53 (7) Corporate securities 381 (14) 1,396 (236) 1,777 (250) Mortgage-backed securities: RMBS 55 (3) 122 (14) 177 (17) CMBS 3 — 184 (10) 187 (10) Asset-backed securities: CLOs 18 (2) 402 (8) 420 (10) Other 1 — 26 (2) 27 (2) Non-U.S. government securities 4 — 89 (23) 93 (23) Total $ 2,093 $ (58) $ 3,150 $ (436) $ 5,243 $ (494) Number of securities (1) 795 1,308 2,079 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 months 12 months or more Total Fair Gross Unrealized Fair Gross Unrealized Fair Gross Unrealized (dollars in millions) Obligations of state and political subdivisions $ 1,763 $ (79) $ 163 $ (56) $ 1,926 $ (135) U.S. government and agencies 32 — 52 (8) 84 (8) Corporate securities 1,276 (95) 519 (147) 1,795 (242) Mortgage-backed securities: RMBS 147 (9) 3 (1) 150 (10) CMBS 270 (11) — — 270 (11) Asset-backed securities: CLOs 171 (7) 250 (14) 421 (21) Other 27 (2) — — 27 (2) Non-U.S. government securities 65 (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.
Investments Classified by Contractual Maturity Date	The amortized cost and estimated fair value of available-for-sale fixed-maturity securities by contractual maturity as of September 30, 2023 are shown below. Expected maturities will differ from contractual maturities because borrowers may have the right to call or prepay obligations with or without call or prepayment penalties. Distribution of Available-for-Sale Fixed-Maturity Securities by Contractual Maturity As of September 30, 2023 Amortized Estimated (in millions) Due within one year $ 248 $ 239 Due after one year through five years 1,526 1,406 Due after five years through 10 years 1,760 1,629 Due after 10 years 2,809 2,475 Mortgage-backed securities: RMBS 430 330 CMBS 198 188 Total $ 6,971 $ 6,267 New Recovery Bonds, Available-for-Sale Reported in FG VIEs’ Assets Distribution by Contractual Maturity As of September 30, 2023 Amortized Estimated (in millions) Due after five years through 10 years $ 28 $ 30 Due after 10 years 108 116 Total $ 136 $ 146
Net Investment Income	Income from Investments Third Quarter Nine Months 2023 2022 2023 2022 (in millions) Investment income: Fixed-maturity securities, available-for-sale: Externally managed (1) $ 51 $ 50 $ 156 $ 150 Loss Mitigation Securities 24 9 46 24 Puerto Rico, New Recovery Bonds 1 1 5 5 Other (2) 5 4 12 11 Short-term investments 21 4 53 5 Other invested assets — — 2 — Investment income 102 68 274 195 Investment expenses (2) (1) (4) (4) Net investment income $ 100 $ 67 $ 270 $ 191 Fair value gains (losses) on trading securities (3) $ 4 $ (8) $ 42 $ (30) Equity in earnings (losses) of investees (4) 18 (20) 25 (31) ____________________ (1) Amounts for 2022 include income on the portion of the CLO portfolio that was previously managed by AssuredIM. (2) Amounts for 2022 include income on the portion of the municipal bond portfolio that was previously managed by AssuredIM. (3) Fair value gains on trading securities pertaining to securities still held as of September 30, 2023 were $4 million for third quarter 2023 and $42 million for nine months 2023. Fair value losses on trading securities pertaining to securities still held as of September 30, 2022 were $2 million for third quarter 2022 and $18 million for nine months 2022.
Net Realized Investment Gains (Losses)	The table below presents the components of net realized investment gains (losses). Realized gains and losses on sales of investments are determined using the specific identification method. Net Realized Investment Gains (Losses) Third Quarter Nine Months 2023 2022 2023 2022 (in millions) Gross realized gains on sales of available-for-sale securities (1) $ 2 $ — $ 21 $ — Gross realized losses on sales of available-for-sale securities (1) (1) (10) (16) (33) Net foreign currency gains (losses) (1) — (1) (3) Change in allowance for credit losses and intent to sell (8) (4) (23) (13) Other net realized gains (losses) (1) — (1) 10 Net realized investment gains (losses) $ (9) $ (14) $ (20) $ (39) ____________________ (1) Gross realized gains and losses on sales in all periods related primarily to sales of New Recovery Bonds received as part of the 2022 Puerto Rico Resolutions.
Rollforward of Credit Losses for Available-for-sale Fixed-Maturity Securities	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 Third Quarter Nine Months 2023 2022 2023 2022 (in millions) Balance, beginning of period $ 79 $ 51 $ 65 $ 42 Additions for securities for which credit losses were not previously recognized — 1 — 4 Additions for purchases of securities accounted for as purchased financial assets with credit deterioration — 2 — 2 Additions (reductions) for securities for which credit losses were previously recognized 7 3 21 9 Balance, end of period $ 86 $ 57 $ 86 $ 57

Financial Guaranty Variable I_2

Financial Guaranty Variable Interest Entities and Consolidated Investment Vehicles (Tables)	9 Months Ended
	Sep. 30, 2023
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Debt Securities, Available-for-Sale	New Recovery Bonds Reported in FG VIEs’ Assets Available-for-Sale Amortized Gross Gross Estimated (dollars in millions) As of September 30, 2023 $ 136 $ 10 $ — $ 146 As of December 31, 2022 204 4 (4) 204
Investments Classified by Contractual Maturity Date	The amortized cost and estimated fair value of available-for-sale fixed-maturity securities by contractual maturity as of September 30, 2023 are shown below. Expected maturities will differ from contractual maturities because borrowers may have the right to call or prepay obligations with or without call or prepayment penalties. Distribution of Available-for-Sale Fixed-Maturity Securities by Contractual Maturity As of September 30, 2023 Amortized Estimated (in millions) Due within one year $ 248 $ 239 Due after one year through five years 1,526 1,406 Due after five years through 10 years 1,760 1,629 Due after 10 years 2,809 2,475 Mortgage-backed securities: RMBS 430 330 CMBS 198 188 Total $ 6,971 $ 6,267 New Recovery Bonds, Available-for-Sale Reported in FG VIEs’ Assets Distribution by Contractual Maturity As of September 30, 2023 Amortized Estimated (in millions) Due after five years through 10 years $ 28 $ 30 Due after 10 years 108 116 Total $ 136 $ 146
Schedule of Consolidated FG VIE's	The table below shows the carrying value of FG VIEs’ assets and liabilities segregated by type of collateral. Consolidated FG VIEs by Type of Collateral As of September 30, 2023 December 31, 2022 (in millions) FG VIEs’ assets: U.S. RMBS first lien $ 146 $ 167 U.S. RMBS second lien 27 30 Puerto Rico Trusts’ assets (includes $146 and $209 at fair value) (1) 147 212 Other 7 7 Total FG VIEs’ assets $ 327 $ 416 FG VIEs’ liabilities with recourse: U.S. RMBS first lien $ 156 $ 176 U.S. RMBS second lien 20 24 Puerto Rico Trusts’ liabilities 347 495 Other 8 7 Total FG VIEs’ liabilities with recourse $ 531 $ 702 FG VIEs’ liabilities without recourse: U.S. RMBS first lien $ 11 $ 13 Total FG VIEs’ liabilities without recourse $ 11 $ 13 ____________________ (1) Includes $2 million of cash as of December 31, 2022. Selected Information for FG VIEs’ Assets and Liabilities Measured under the FVO As of September 30, 2023 December 31, 2022 (in millions) Excess of unpaid principal over fair value of: FG VIEs’ assets $ 266 $ 265 FG VIEs’ liabilities with recourse 51 21 FG VIEs’ liabilities without recourse 16 15 Unpaid principal balance for FG VIEs’ assets that were 90 days or more past due 29 34 Unpaid principal for FG VIEs’ liabilities with recourse (1) 582 723 ____________________ (1) FG VIEs’ liabilities with recourse will mature at various dates ranging from 2023 through 2041. Number of Consolidated CIVs by Type As of CIV Type September 30, 2023 December 31, 2022 Funds 3 8 CLOs — 10 CLO warehouses — 4 Total number of consolidated CIVs (1) 3 22 ____________________ (1) As of December 31, 2022, two CIVs were voting interest entities (VOEs). Funds meet the criteria for consolidating a VOE when the Company possesses substantially all of the economics and all of the decision-making authority. Assets and Liabilities of CIVs As of September 30, 2023 December 31, 2022 (in millions) Assets: Fund assets: Cash and cash equivalents $ 7 $ 59 Fund investments, at fair value Equity securities and warrants 79 434 Structured products 239 128 Corporate securities — 96 Other 5 1 CLO and CLO warehouse assets: Cash — 38 CLO investments: Loans in CLOs and CLO warehouses, FVO — 4,570 Short-term investments, at fair value — 135 Due from brokers and counterparties — 32 Total assets (1) $ 330 $ 5,493 Liabilities: CLO obligations, FVO (2) — 4,090 Warehouse financing debt, FVO (3) — 313 Due to brokers and counterparties 4 112 Other liabilities (4) — 110 Total liabilities $ 4 $ 4,625 ____________________ (1) Includes investments in AssuredIM funds and other affiliated entities of $392 million as of December 31, 2022. Includes assets and liabilities of a VOE of $58 million and $1 million, respectively, as of December 31, 2022. (2) As of December 31, 2022, the weighted average maturity of CLO obligations was 6.2 years and the weighted average interest rate of CLO obligations was 5.3%. (3) The weighted average maturity of warehouse financing debt of CLO warehouses was 1.9 years as of December 31, 2022. The weighted average interest rate of warehouse financing debt of CLO warehouses was 4.5% as of December 31, 2022. (4) As of December 31, 2022, includes redeemable noncontrolling interests (NCI).

Fair Value Measurement (Tables)

Fair Value Measurement (Tables)	9 Months Ended
	Sep. 30, 2023
Fair Value Disclosures [Abstract]
Fair Value Hierarchy of Financial Instruments Carried at Fair Value	Amounts recorded at fair value in the Company’s financial statements are presented in the tables below. Fair Value Hierarchy of Financial Instruments Carried at Fair Value As of September 30, 2023 Fair Value Hierarchy Level 1 Level 2 Level 3 Total (in millions) Assets: Fixed-maturity securities, available-for-sale Obligations of state and political subdivisions $ — $ 2,764 $ 2 $ 2,766 U.S. government and agencies — 58 — 58 Corporate securities — 2,009 — 2,009 Mortgage-backed securities: RMBS — 177 153 330 CMBS — 188 — 188 Asset-backed securities — 27 796 823 Non-U.S. government securities — 93 — 93 Total fixed-maturity securities, available-for-sale — 5,316 951 6,267 Fixed-maturity securities, trading — 350 — 350 Short-term investments 1,418 8 — 1,426 Other invested assets (1) — — 3 3 FG VIEs’ assets — 146 180 326 Assets of CIVs: Equity securities and warrants — 4 75 79 Structured products — 66 173 239 Total assets of CIVs — 70 248 318 Other assets 51 48 13 112 Total assets carried at fair value $ 1,469 $ 5,938 $ 1,395 $ 8,802 Liabilities: Credit derivative liabilities $ — $ — $ 50 $ 50 FG VIEs’ liabilities (3) — — 542 542 Total liabilities carried at fair value $ — $ — $ 592 $ 592 Fair Value Hierarchy of Financial Instruments Carried at Fair Value As of December 31, 2022 Fair Value Hierarchy Level 1 Level 2 Level 3 Total (in millions) Assets: Fixed-maturity securities, available-for sale Obligations of state and political subdivisions $ — $ 3,347 $ 47 $ 3,394 U.S. government and agencies — 111 — 111 Corporate securities — 2,084 — 2,084 Mortgage-backed securities: RMBS — 161 179 340 CMBS — 271 — 271 Asset-backed securities — 27 794 821 Non-U.S. government securities — 98 — 98 Total fixed-maturity securities, available-for-sale — 6,099 1,020 7,119 Fixed-maturity securities, trading — 303 — 303 Short-term investments 771 39 — 810 Other invested assets (1) 2 — 5 7 FG VIEs’ assets — 209 204 413 Assets of CIVs (2): Fund investments: Equity securities and warrants — 5 297 302 Corporate securities — — 96 96 Structured products — 82 46 128 CLOs and CLO warehouse assets: Loans — 4,570 — 4,570 Short-term investments 135 — — 135 Total assets of CIVs 135 4,657 439 5,231 Other assets 54 46 48 148 Total assets carried at fair value $ 962 $ 11,353 $ 1,716 $ 14,031 Liabilities: Credit derivative liabilities $ — $ — $ 163 $ 163 FG VIEs’ liabilities (3) — — 715 715 Liabilities of CIVs: CLO obligations of CFEs — — 4,090 4,090 Warehouse financing debt — 277 36 313 Securitized borrowing — — 28 28 Total liabilities of CIVs — 277 4,154 4,431 Other liabilities — 7 — 7 Total liabilities carried at fair value $ — $ 284 $ 5,032 $ 5,316 ___________________ (1) Includes Level 3 mortgage loans that are recorded at fair value on a non-recurring basis. (2) As of December 31, 2022, excludes $5 million in investments in AssuredIM funds for which the Company recorded a 100% NCI. The consolidation of these funds resulted in a gross up of assets and NCI on the consolidated financial statements; however, it resulted in no economic equity or net income attributable to AGL. (3) Includes FG VIEs’ liabilities with recourse and FG VIEs’ liabilities without recourse. See Note 8, Financial Guaranty Variable Interest Entities and Consolidated Investment Vehicles.
Fair Value Assets Measured on Recurring Basis	The tables below present a roll forward of the Company’s Level 3 financial instruments carried at fair value on a recurring basis during third quarter 2023, third quarter 2022, nine months 2023 and nine months 2022. Roll Forward of Level 3 Assets (Liabilities) at Fair Value on a Recurring Basis Third Quarter 2023 Fixed-Maturity Securities, Available-for-Sale Assets of CIVs Obligations RMBS Asset- FG VIEs’ Equity Securities and Warrants Corporate Securities Structured Products Other (in millions) Fair value as of June 30, 2023 $ 46 $ 162 $ 800 $ 188 $ 290 $ 84 $ — $ 33 Total pre-tax realized and unrealized gains (losses) recorded in: Net income (loss) — 4 (1) 13 (1) 1 (2) 5 (4) — 7 (4) (20) (3) Other comprehensive income (loss) (3) (6) (2) — — — — — Purchases — — — — 3 — — — Sales — — — — (4) — — — Settlements (1) (7) (15) (9) — — — — Consolidations — — — — — — — — Deconsolidations — — — — (219) (84) 166 — Transfers out of Level 3 (40) — — — — — — — Fair value as of September 30, 2023 $ 2 $ 153 $ 796 $ 180 $ 75 $ — $ 173 $ 13 Change in unrealized gains (losses) related to financial instruments held as of September 30, 2023 included in: Earnings $ — $ 6 (4) $ — $ 7 (4) $ (20) (3) OCI $ — $ (6) $ 3 $ — Roll Forward of Level 3 Assets (Liabilities) at Fair Value on a Recurring Basis Third Quarter 2023 Credit Derivative FG VIEs’ Liabilities (8) Liabilities of CIVs (in millions) Fair value as of June 30, 2023 $ (57) $ (699) $ (4,199) Total pre-tax realized and unrealized gains (losses) recorded in: Net income (loss) 9 (6) 17 (2) — Other comprehensive income (loss) — 13 — Settlements (1) 127 — Deconsolidations — — 4,199 Fair value as of September 30, 2023 $ (49) $ (542) $ — Change in unrealized gains (losses) related to financial instruments held as of September 30, 2023 included in: Earnings $ 9 (6) $ 9 (2) $ — OCI $ 13 $ — Roll Forward of Level 3 Assets (Liabilities) at Fair Value on a Recurring Basis Third Quarter 2022 Fixed-Maturity Securities, Available-for-Sale Assets of CIVs Obligations RMBS Asset- FG VIEs’ Equity Securities and Warrants Corporate Securities Structured Products Other (in millions) Fair value as of June 30, 2022 $ 51 $ 184 $ 805 $ 223 $ 258 $ 90 $ 38 $ 37 Total pre-tax realized and unrealized gains (losses) recorded in: Net income (loss) — 3 (1) 2 (1) 3 (2) (11) (4) (2) (4) (3) (4) 1 (3) Other comprehensive income (loss) (3) (8) 1 — — — — — Purchases — 22 4 — 52 1 8 — Sales — — (1) — (2) (2) — — Settlements — (9) (5) (16) — — — — Fair value as of September 30, 2022 $ 48 $ 192 $ 806 $ 210 $ 297 $ 87 $ 43 $ 38 Change in unrealized gains (losses) related to financial instruments held as of September 30, 2022 included in: Earnings $ 3 (2) $ (11) (4) $ (2) (4) $ (3) (4) $ 1 (3) OCI $ (3) $ (8) $ 1 $ — Roll Forward of Level 3 Assets (Liabilities) at Fair Value on a Recurring Basis Third Quarter 2022 Credit Derivative FG VIEs’ Liabilities (8) Liabilities of CIVs (in millions) Fair value as of June 30, 2022 $ (147) $ (282) $ (3,987) Total pre-tax realized and unrealized gains (losses) recorded in: Net income (loss) (48) (6) 8 (2) (31) (4) Other comprehensive income (loss) — (4) 41 Issuances — — (8) Sales — — 2 Settlements 1 27 — Consolidations — — (26) Fair value as of September 30, 2022 $ (194) $ (251) $ (4,009) Change in unrealized gains (losses) related to financial instruments held as of September 30, 2022 included in: Earnings $ (46) (6) $ 8 (2) $ (13) (4) OCI $ (4) $ 41 Roll Forward of Level 3 Assets (Liabilities) at Fair Value on a Recurring Basis Nine Months 2023 Fixed-Maturity Securities, Available-for-Sale Assets of CIVs Obligations RMBS Asset- FG VIEs’ Equity Securities and Warrants Corporate Securities Structured Products Other (in millions) Fair value as of December 31, 2022 $ 47 $ 179 $ 794 $ 204 $ 297 $ 96 $ 46 $ 50 Total pre-tax realized and unrealized gains (losses) recorded in: Net income (loss) 1 (1) 11 (1) 13 (1) — 45 (4) (3) (4) 9 (4) (33) (3) Other comprehensive income (loss) (3) (14) (10) — — — — — Purchases — — 23 — 41 6 — — Sales — — (2) — (89) (15) (48) — Settlements (3) (23) (22) (24) — — — (4) Deconsolidations — — — — (219) (84) 166 — Transfers out of Level 3 (40) — — — — — — — Fair value as of September 30, 2023 $ 2 $ 153 $ 796 $ 180 $ 75 $ — $ 173 $ 13 Change in unrealized gains (losses) related to financial instruments held as of September 30, 2023 included in: Earnings $ (3) (2) $ 6 (4) $ — $ 7 (4) $ (33) (3) OCI $ — $ (13) $ — $ — Roll Forward of Level 3 Assets (Liabilities) at Fair Value on a Recurring Basis Nine Months 2023 Credit Derivative FG VIEs’ Liabilities (8) Liabilities of CIVs (in millions) Fair value as of December 31, 2022 $ (162) $ (715) $ (4,154) Total pre-tax realized and unrealized gains (losses) recorded in: Net income (loss) 115 (6) 18 (2) (45) (4) Other comprehensive income (loss) — 14 (13) Settlements (2) 141 13 Deconsolidations — — 4,199 Fair value as of September 30, 2023 $ (49) $ (542) $ — Change in unrealized gains (losses) related to financial instruments held as of September 30, 2023 included in: Earnings $ 114 (6) $ 11 (2) $ — OCI $ 14 $ — Roll Forward of Level 3 Assets (Liabilities) at Fair Value on a Recurring Basis Nine Months 2022 Fixed-Maturity Securities, Available-for-Sale Assets of CIVs Obligations RMBS Asset- FG VIEs’ Equity Securities Corporate Securities Structured Products Other (in millions) Fair value as of December 31, 2021 $ 72 $ 216 $ 863 $ 260 $ 239 $ 91 $ — $ 27 Total pre-tax realized and unrealized gains (losses) recorded in: Net income (loss) — 13 (1) 2 (1) — 15 (4) 4 (4) (6) (4) 12 (3) Other comprehensive income (loss) (11) (27) (36) — — — — (1) Purchases — 22 39 — 57 2 50 — Sales — — (13) — (14) (10) (21) — Settlements (13) (32) (49) (50) — — — — Consolidations — — — 15 — — — — Deconsolidations — — — (15) — — 20 — Fair value as of September 30, 2022 $ 48 $ 192 $ 806 $ 210 $ 297 $ 87 $ 43 $ 38 Change in unrealized gains (losses) related to financial instruments held as of September 30, 2022 included in: Earnings $ 1 (2) $ 7 (4) $ 3 (4) $ (6) (4) $ 12 (3) OCI $ (13) $ (25) $ (35) $ (1) Roll Forward of Level 3 Assets (Liabilities) at Fair Value on a Recurring Basis Nine Months 2022 Credit Derivative FG VIEs’ Liabilities of CIVs (in millions) Fair value as of December 31, 2021 $ (154) $ (289) $ (3,705) Total pre-tax realized and unrealized gains (losses) recorded in: Net income (loss) (42) (6) 34 (2) 264 (4) Other comprehensive income (loss) — (1) 97 Issuances — — (1,416) Sales — — 2 Settlements 2 92 401 Consolidations — (102) (26) Deconsolidations — 15 374 Fair value as of September 30, 2022 $ (194) $ (251) $ (4,009) Change in unrealized gains (losses) related to financial instruments held as of September 30, 2022 included in: Earnings $ (41) (6) $ 57 (2) $ 289 (4) OCI $ (1) $ 97 ____________________ (1) Included in “net realized investment gains (losses)” and “net investment income.” (2) Included in “fair value gains (losses) on FG VIEs.” (3) Reported in “fair value gains (losses) on CCS”, “net investment income” and “other income (loss).” (4) Reported in “fair value gains (losses) on CIVs.” (5) Represents the net position of credit derivatives. Credit derivative assets (reported in “other assets”) and credit derivative liabilities (presented as a separate line item) are shown as either assets or liabilities in the condensed consolidated balance sheets based on net exposure by transaction. (6) Reported in “fair value gains (losses) on credit derivatives.” (7) Includes CCS and other invested assets. (8) Includes FG VIEs’ liabilities with recourse and FG VIEs’ liabilities without recourse.
Fair Value, Liabilities Measured on Recurring Basis	The tables below present a roll forward of the Company’s Level 3 financial instruments carried at fair value on a recurring basis during third quarter 2023, third quarter 2022, nine months 2023 and nine months 2022. Roll Forward of Level 3 Assets (Liabilities) at Fair Value on a Recurring Basis Third Quarter 2023 Fixed-Maturity Securities, Available-for-Sale Assets of CIVs Obligations RMBS Asset- FG VIEs’ Equity Securities and Warrants Corporate Securities Structured Products Other (in millions) Fair value as of June 30, 2023 $ 46 $ 162 $ 800 $ 188 $ 290 $ 84 $ — $ 33 Total pre-tax realized and unrealized gains (losses) recorded in: Net income (loss) — 4 (1) 13 (1) 1 (2) 5 (4) — 7 (4) (20) (3) Other comprehensive income (loss) (3) (6) (2) — — — — — Purchases — — — — 3 — — — Sales — — — — (4) — — — Settlements (1) (7) (15) (9) — — — — Consolidations — — — — — — — — Deconsolidations — — — — (219) (84) 166 — Transfers out of Level 3 (40) — — — — — — — Fair value as of September 30, 2023 $ 2 $ 153 $ 796 $ 180 $ 75 $ — $ 173 $ 13 Change in unrealized gains (losses) related to financial instruments held as of September 30, 2023 included in: Earnings $ — $ 6 (4) $ — $ 7 (4) $ (20) (3) OCI $ — $ (6) $ 3 $ — Roll Forward of Level 3 Assets (Liabilities) at Fair Value on a Recurring Basis Third Quarter 2023 Credit Derivative FG VIEs’ Liabilities (8) Liabilities of CIVs (in millions) Fair value as of June 30, 2023 $ (57) $ (699) $ (4,199) Total pre-tax realized and unrealized gains (losses) recorded in: Net income (loss) 9 (6) 17 (2) — Other comprehensive income (loss) — 13 — Settlements (1) 127 — Deconsolidations — — 4,199 Fair value as of September 30, 2023 $ (49) $ (542) $ — Change in unrealized gains (losses) related to financial instruments held as of September 30, 2023 included in: Earnings $ 9 (6) $ 9 (2) $ — OCI $ 13 $ — Roll Forward of Level 3 Assets (Liabilities) at Fair Value on a Recurring Basis Third Quarter 2022 Fixed-Maturity Securities, Available-for-Sale Assets of CIVs Obligations RMBS Asset- FG VIEs’ Equity Securities and Warrants Corporate Securities Structured Products Other (in millions) Fair value as of June 30, 2022 $ 51 $ 184 $ 805 $ 223 $ 258 $ 90 $ 38 $ 37 Total pre-tax realized and unrealized gains (losses) recorded in: Net income (loss) — 3 (1) 2 (1) 3 (2) (11) (4) (2) (4) (3) (4) 1 (3) Other comprehensive income (loss) (3) (8) 1 — — — — — Purchases — 22 4 — 52 1 8 — Sales — — (1) — (2) (2) — — Settlements — (9) (5) (16) — — — — Fair value as of September 30, 2022 $ 48 $ 192 $ 806 $ 210 $ 297 $ 87 $ 43 $ 38 Change in unrealized gains (losses) related to financial instruments held as of September 30, 2022 included in: Earnings $ 3 (2) $ (11) (4) $ (2) (4) $ (3) (4) $ 1 (3) OCI $ (3) $ (8) $ 1 $ — Roll Forward of Level 3 Assets (Liabilities) at Fair Value on a Recurring Basis Third Quarter 2022 Credit Derivative FG VIEs’ Liabilities (8) Liabilities of CIVs (in millions) Fair value as of June 30, 2022 $ (147) $ (282) $ (3,987) Total pre-tax realized and unrealized gains (losses) recorded in: Net income (loss) (48) (6) 8 (2) (31) (4) Other comprehensive income (loss) — (4) 41 Issuances — — (8) Sales — — 2 Settlements 1 27 — Consolidations — — (26) Fair value as of September 30, 2022 $ (194) $ (251) $ (4,009) Change in unrealized gains (losses) related to financial instruments held as of September 30, 2022 included in: Earnings $ (46) (6) $ 8 (2) $ (13) (4) OCI $ (4) $ 41 Roll Forward of Level 3 Assets (Liabilities) at Fair Value on a Recurring Basis Nine Months 2023 Fixed-Maturity Securities, Available-for-Sale Assets of CIVs Obligations RMBS Asset- FG VIEs’ Equity Securities and Warrants Corporate Securities Structured Products Other (in millions) Fair value as of December 31, 2022 $ 47 $ 179 $ 794 $ 204 $ 297 $ 96 $ 46 $ 50 Total pre-tax realized and unrealized gains (losses) recorded in: Net income (loss) 1 (1) 11 (1) 13 (1) — 45 (4) (3) (4) 9 (4) (33) (3) Other comprehensive income (loss) (3) (14) (10) — — — — — Purchases — — 23 — 41 6 — — Sales — — (2) — (89) (15) (48) — Settlements (3) (23) (22) (24) — — — (4) Deconsolidations — — — — (219) (84) 166 — Transfers out of Level 3 (40) — — — — — — — Fair value as of September 30, 2023 $ 2 $ 153 $ 796 $ 180 $ 75 $ — $ 173 $ 13 Change in unrealized gains (losses) related to financial instruments held as of September 30, 2023 included in: Earnings $ (3) (2) $ 6 (4) $ — $ 7 (4) $ (33) (3) OCI $ — $ (13) $ — $ — Roll Forward of Level 3 Assets (Liabilities) at Fair Value on a Recurring Basis Nine Months 2023 Credit Derivative FG VIEs’ Liabilities (8) Liabilities of CIVs (in millions) Fair value as of December 31, 2022 $ (162) $ (715) $ (4,154) Total pre-tax realized and unrealized gains (losses) recorded in: Net income (loss) 115 (6) 18 (2) (45) (4) Other comprehensive income (loss) — 14 (13) Settlements (2) 141 13 Deconsolidations — — 4,199 Fair value as of September 30, 2023 $ (49) $ (542) $ — Change in unrealized gains (losses) related to financial instruments held as of September 30, 2023 included in: Earnings $ 114 (6) $ 11 (2) $ — OCI $ 14 $ — Roll Forward of Level 3 Assets (Liabilities) at Fair Value on a Recurring Basis Nine Months 2022 Fixed-Maturity Securities, Available-for-Sale Assets of CIVs Obligations RMBS Asset- FG VIEs’ Equity Securities Corporate Securities Structured Products Other (in millions) Fair value as of December 31, 2021 $ 72 $ 216 $ 863 $ 260 $ 239 $ 91 $ — $ 27 Total pre-tax realized and unrealized gains (losses) recorded in: Net income (loss) — 13 (1) 2 (1) — 15 (4) 4 (4) (6) (4) 12 (3) Other comprehensive income (loss) (11) (27) (36) — — — — (1) Purchases — 22 39 — 57 2 50 — Sales — — (13) — (14) (10) (21) — Settlements (13) (32) (49) (50) — — — — Consolidations — — — 15 — — — — Deconsolidations — — — (15) — — 20 — Fair value as of September 30, 2022 $ 48 $ 192 $ 806 $ 210 $ 297 $ 87 $ 43 $ 38 Change in unrealized gains (losses) related to financial instruments held as of September 30, 2022 included in: Earnings $ 1 (2) $ 7 (4) $ 3 (4) $ (6) (4) $ 12 (3) OCI $ (13) $ (25) $ (35) $ (1) Roll Forward of Level 3 Assets (Liabilities) at Fair Value on a Recurring Basis Nine Months 2022 Credit Derivative FG VIEs’ Liabilities of CIVs (in millions) Fair value as of December 31, 2021 $ (154) $ (289) $ (3,705) Total pre-tax realized and unrealized gains (losses) recorded in: Net income (loss) (42) (6) 34 (2) 264 (4) Other comprehensive income (loss) — (1) 97 Issuances — — (1,416) Sales — — 2 Settlements 2 92 401 Consolidations — (102) (26) Deconsolidations — 15 374 Fair value as of September 30, 2022 $ (194) $ (251) $ (4,009) Change in unrealized gains (losses) related to financial instruments held as of September 30, 2022 included in: Earnings $ (41) (6) $ 57 (2) $ 289 (4) OCI $ (1) $ 97 ____________________ (1) Included in “net realized investment gains (losses)” and “net investment income.” (2) Included in “fair value gains (losses) on FG VIEs.” (3) Reported in “fair value gains (losses) on CCS”, “net investment income” and “other income (loss).” (4) Reported in “fair value gains (losses) on CIVs.” (5) Represents the net position of credit derivatives. Credit derivative assets (reported in “other assets”) and credit derivative liabilities (presented as a separate line item) are shown as either assets or liabilities in the condensed consolidated balance sheets based on net exposure by transaction. (6) Reported in “fair value gains (losses) on credit derivatives.” (7) Includes CCS and other invested assets. (8) Includes FG VIEs’ liabilities with recourse and FG VIEs’ liabilities without recourse.
Schedule of Quantitative Information About Level 3 Liabilities, Fair Value Measurements	Quantitative Information About Level 3 Fair Value Inputs As of September 30, 2023 Financial Instrument Description Fair Value Assets (Liabilities) Significant Unobservable Inputs Range Weighted Average (4) Investments (2): Fixed-maturity securities, available-for-sale (1): Obligations of state and political subdivisions $ 2 Yield 8.8 % - 21.5% 9.1% RMBS 153 CPR 0.0 % - 15.0% 3.9% CDR 1.4 % - 16.0% 5.7% Loss severity 50.0 % - 125.0% 82.6% Yield 8.2 % - 11.9% 9.7% Asset-backed securities: Life insurance transactions 331 Yield 8.1% CLOs 454 Discount margin 1.3 % - 7.8% 2.7% Others 11 Yield 6.3 % - 12.3% 12.1% FG VIEs’ assets (1) 180 CPR 0.1 % - 21.2% 8.0% CDR 1.3 % - 41.0% 9.3% Loss severity 45.0 % - 100.0% 82.6% Yield 8.1 % - 11.5% 10.1% Assets of CIVs (3): Equity securities and warrants 75 Discount rate 20.9% Market multiple-price to book 1.10x Market multiple-price to earnings 5.25x Terminal growth rate 4.0% Exit multiple-price to book 1.10x Exit multiple-price to earnings 5.25x Structured products 173 Yield 7.5 % - 28.1% 17.9% Other assets (1) 12 Implied Yield 7.7 % - 8.2% 7.9% Term (years) 10 years Credit derivative liabilities, net (1) (49) Hedge cost (in bps) 17.2 - 39.2 24.1 Bank profit (in bps) 115.5 - 293.2 155.7 Internal floor (in bps) 10.0 Internal credit rating AAA - CCC A FG VIEs’ liabilities (1) (542) CPR 0.1 % - 21.2% 8.0% CDR 1.3 % - 41.0% 9.3% Loss severity 45.0 % - 100.0% 82.6% Yield 5.5 % - 11.5% 6.5% ___________________ (1) Discounted cash flow is used as the primary valuation technique. (2) Excludes several investments reported in “other invested assets” with a fair value of $3 million. (3) The primary valuation technique uses the income and/or market approach; the key inputs to the valuation are yield/discount rates and market multiples. (4) Weighted average is calculated as a percentage of current par outstanding for all categories except for assets of CIVs, for which it is calculated as a percentage of fair value. Quantitative Information About Level 3 Fair Value Inputs As of December 31, 2022 Financial Instrument Description Fair Value Assets (Liabilities) Significant Unobservable Inputs Range Weighted Average (4) Investments (2): Fixed-maturity securities, available-for-sale (1): Obligations of state and political subdivisions $ 47 Yield 7.4 % - 13.5% 9.4% RMBS 179 CPR 3.8 % - 16.1% 8.2% CDR 1.5 % - 12.0% 5.9% Loss severity 50.0 % - 125.0% 82.5% Yield 7.5 % - 11.3% 9.0% Asset-backed securities: Life insurance transactions 342 Yield 11.3% CLOs 428 Discount margin 1.8 % - 4.1% 3.0% Others 24 Yield 7.4 % - 12.9% 12.8% FG VIEs’ assets (1) 204 CPR 0.9 % - 21.9% 12.9% CDR 1.3 % - 41.0% 7.6% Loss severity 45.0 % - 100.0% 81.0% Yield 6.6 % - 10.9% 7.5% Assets of CIVs (3): Equity securities and warrants 297 Yield 10.0% Discount rate 19.8% - 25.1% 22.7% Market multiple-enterprise value/revenue 1.05x - 1.10x 1.08x Market multiple-enterprise value/EBITDA (6) 2.50x - 11.00x 10.25x Market multiple-price to book 1.15x Market multiple-price to earnings 4.50x Terminal growth rate 3.0% - 4.0% 3.5% Exit multiple-EBITDA 8.00x - 12.00x 10.53x Exit multiple-price to book 1.30x Exit multiple-price to earnings 5.50x Cost 1.00x Corporate securities 96 Discount rate 20.8 % - 23.8% 21.7% Yield 16.3% Exit multiple-EBITDA 8.00x Cost 1.00x Market multiple-enterprise value/EBITDA 2.50x - 2.75x 2.63x Structured products 46 Yield 12.8 % - 37.1% 18.9% Other assets (1) 47 Implied Yield 7.7 % - 8.4% 8.1% Term (years) 10 years Financial Instrument Description Fair Value Assets (Liabilities) Significant Unobservable Inputs Range Weighted Average (4) Credit derivative liabilities, net (1) (162) Year 1 loss estimates 11.5 % - 25.2% 15.7% Bank profit (in bps) 51.0 - 270.5 109.4 Internal credit rating AAA - CCC AA FG VIEs’ liabilities (1) (715) CPR 0.9 % - 21.9% 6.3% CDR 1.3 % - 41.0% 3.7% Loss severity 45.0 % - 100.0% 39.9% Yield 4.8 % - 10.9% 5.9% Liabilities of CIVs (1): CLO obligations of CFEs (5) (4,090) Yield 3.0 % - 27.4% 5.5% Warehouse financing debt (36) Yield 11.7 % - 16.9% 12.9% Securitized borrowing (28) Discount rate 20.9% Terminal growth rate 3.0% Exit multiple-EBITDA 11.00x Market multiple-enterprise value/EBITDA 10.00x - 11.00x 10.50x ____________________ (1) Discounted cash flow is used as the primary valuation technique. (2) Excludes several investments reported in “other invested assets” with a fair value of $5 million. (3) The primary valuation technique uses the income and/or market approach, the key inputs to the valuation are yield/discount rates and market multiples. (4) Weighted average is calculated as a percentage of current par outstanding for all categories except for assets of CIVs, for which it is calculated as a percentage of fair value. (5) See CFE fair value methodology described above for consolidated CLOs. (6) Earnings before interest, taxes, depreciation, and amortization (EBITDA).
Fair Value Disclosure of Asset and Liability Not Measured at Fair Value	The carrying amount and estimated fair value of the Company’s financial instruments not carried at fair value are presented in the following table. Fair Value of Financial Instruments Not Carried at Fair Value As of September 30, 2023 As of December 31, 2022 Carrying Estimated Carrying Estimated (in millions) Assets (liabilities): Assets of CIVs (1) $ 21 $ 21 $ 46 $ 46 Other assets (including other invested assets) (2) 106 107 92 93 Financial guaranty insurance contracts (3) (2,280) (1,712) (2,335) (986) Long-term debt (1,693) (1,477) (1,675) (1,477) Liabilities of CIVs (4) (4) (4) (170) (170) Other liabilities (5) (17) (17) (43) (43) ____________________ (1) Includes due from brokers and counterparties and cash equivalents. Carrying value approximates fair value. (2) Primarily includes accrued interest, a participation loan, and receivables for securities sold, for which carrying value approximates fair value. Also includes note receivable from Sound Point as of September 30, 2023 and management fees receivables as of December 31, 2022. (3) Carrying amount includes the assets and liabilities related to financial guaranty insurance contract premiums, losses, and salvage and subrogation and other recoverables net of reinsurance. (4) Includes due to brokers and counterparties and, as of December 31, 2022, fund’s loan payable. Carrying value approximates fair value. (5) Primarily includes accrued interest, repurchase agreement liability as of December 31, 2022, and payables for securities purchased for which carrying value approximates fair value.

Asset Management Fees (Tables)

Asset Management Fees (Tables)	9 Months Ended
	Sep. 30, 2023
Revenue from Contract with Customer [Abstract]
Disaggregation of Revenue	The following table presents the sources of asset management fees on a consolidated basis through the end of June 30, 2023. Upon closing of the Sound Point Transaction and the AHP Transaction, the Company deconsolidated the transferred AssuredIM subsidiaries and reports its investment in Sound Point as an equity method investment (on a one-quarter lag). As a result, the Company no longer has asset management fee revenues on its consolidated statement of operations. Asset Management Fees Third Quarter Nine Months 2023 2022 2023 2022 (in millions) Management fees $ — $ 11 $ 21 $ 41 Performance fees — 2 18 17 Reimbursable fund expenses — 3 14 13 Total asset management fees $ — $ 16 $ 53 $ 71

Long-Term Debt (Tables)

Long-Term Debt (Tables)	9 Months Ended
	Sep. 30, 2023
Debt Disclosure [Abstract]
Principal and Carrying Amounts of Debt	The principal and carrying values of the Company’s debt are presented in the table below. Principal and Carrying Amounts of Long-Term Debt As of September 30, 2023 As of December 31, 2022 Principal Carrying Principal Carrying (in millions) AGUS 5% Senior Notes $ — $ — $ 330 $ 329 AGUS 6.125% Senior Notes 350 345 — — AGUS 3.15% Senior Notes 500 495 500 495 AGUS 7% Senior Notes 200 198 200 198 AGUS 3.6% Senior Notes 400 395 400 395 AGUS Series A Enhanced Junior Subordinated Debentures 150 150 150 150 AGMH Junior Subordinated Debentures (1) 146 110 146 108 Total $ 1,746 $ 1,693 $ 1,726 $ 1,675 ____________________ (1) Carrying amounts are different than principal amounts primarily due to fair value adjustments at the date of the AGMH acquisition, which are accreted into interest expense over the remaining terms of these obligations. Net of AGMH’s long-term debt purchased by AGUS.

Income Taxes (Tables)

Income Taxes (Tables)	9 Months Ended
	Sep. 30, 2023
Income Tax Disclosure [Abstract]
Schedule of Deferred Tax Assets and Liabilities	Deferred and Current Tax Assets (Liabilities) As of September 30, 2023 December 31, 2022 (in millions) Net deferred tax assets (liabilities) $ 82 $ 114 Net current tax assets (liabilities) 34 63
Effective Tax Rate Reconciliation	A reconciliation of the difference between the provision for income taxes and the expected tax provision at statutory rates in taxable jurisdictions is presented below. Effective Tax Rate Reconciliation Third Quarter Nine Months 2023 2022 2023 2022 (in millions) Expected tax provision (benefit) $ 45 $ (6) $ 88 $ 6 Tax-exempt interest (3) (3) (9) (10) NCI (1) 1 (4) (5) Return to provision adjustment (6) (20) (6) (20) State taxes 1 2 8 10 Foreign taxes 7 (1) 8 9 Taxes on reinsurance (1) — (1) (1) Stock based compensation 2 — 2 4 Other (1) — (2) 1 Total provision (benefit) for income taxes $ 43 $ (27) $ 84 $ (6) Effective tax rate 21.4 % 123.5 % 18.1 % (12.1) %
Pretax Income (Loss) by Tax Jurisdiction	The following tables present pre-tax income and revenue by jurisdiction. Pre-tax Income (Loss) by Tax Jurisdiction Third Quarter Nine Months 2023 2022 2023 2022 (in millions) U.S. $ 233 $ 3 $ 458 $ 112 Bermuda (17) 10 41 27 U.K. (10) (30) (25) (75) Other (4) (5) (8) (15) Total $ 202 $ (22) $ 466 $ 49
Revenue by Tax Jurisdiction	Revenue by Tax Jurisdiction Third Quarter Nine Months 2023 2022 2023 2022 (in millions) U.S. $ 373 $ 60 $ 901 $ 435 Bermuda 30 4 123 43 U.K. 1 (21) 22 (39) Other (1) (2) — (8) Total $ 403 $ 41 $ 1,046 $ 431

Shareholders' Equity (Tables)

Shareholders' Equity (Tables)	9 Months Ended
	Sep. 30, 2023
Equity [Abstract]
Changes in Accumulated Other Comprehensive Income by Component	The following tables present the changes in each component of accumulated other comprehensive income (AOCI) and the effect of reclassifications out of AOCI into the respective lines in the condensed consolidated statements of operations. Changes in Accumulated Other Comprehensive Income (Loss) by Component Third Quarter 2023 Net Unrealized Gains (Losses) on Investments with: ISCR on Cumulative Cash Flow Total AOCI No Credit Impairment Credit Impairment (in millions) Balance, June 30, 2023 $ (284) $ (115) $ (22) $ (42) $ 5 $ (458) Other comprehensive income (loss) before reclassifications (115) (14) 10 (1) — (120) Less: Amounts reclassified from AOCI to: Net realized investment gains (losses) (2) (7) — — — (9) Fair value gains (losses) on CIVs — — — (6) — (6) Total before tax (2) (7) — (6) — (15) Tax (provision) benefit — 1 — 1 — 2 Total amount reclassified from AOCI, net of tax (2) (6) — (5) — (13) Other comprehensive income (loss) (113) (8) 10 4 — (107) Balance, September 30, 2023 $ (397) $ (123) $ (12) $ (38) $ 5 $ (565) Changes in Accumulated Other Comprehensive Income (Loss) by Component Third Quarter 2022 Net Unrealized Gains (Losses) on Investments with: ISCR on Cumulative Cash Flow Total AOCI No Credit Impairment Credit Impairment (in millions) Balance, June 30, 2022 $ (205) $ (107) $ (19) $ (45) $ 6 $ (370) Other comprehensive income (loss) before reclassifications (286) (1) (3) (4) — (294) Less: Amounts reclassified from AOCI to: Net realized investment gains (losses) (11) (3) — — — (14) Total before tax (11) (3) — — — (14) Tax (provision) benefit 2 — — — — 2 Total amount reclassified from AOCI, net of tax (9) (3) — — — (12) Other comprehensive income (loss) (277) 2 (3) (4) — (282) Balance, September 30, 2022 $ (482) $ (105) $ (22) $ (49) $ 6 $ (652) Changes in Accumulated Other Comprehensive Income (Loss) by Component Nine Months 2023 Net Unrealized Gains (Losses) on Investments with: ISCR on Cumulative Cash Flow Total AOCI No Credit Impairment Credit Impairment (in millions) Balance, December 31, 2022 $ (343) $ (110) $ (23) $ (45) $ 6 $ (515) Other comprehensive income (loss) before reclassifications (54) (31) 9 2 — (74) Less: Amounts reclassified from AOCI to: Net realized investment gains (losses) 2 (22) — — — (20) Fair value gains (losses) on FG VIEs — — (2) — — (2) Fair value gains (losses) on CIVs — — — (6) — (6) Interest expense — — — — 1 1 Total before tax 2 (22) (2) (6) 1 (27) Tax (provision) benefit (2) 4 — 1 — 3 Total amount reclassified from AOCI, net of tax — (18) (2) (5) 1 (24) Other comprehensive income (loss) (54) (13) 11 7 (1) (50) Balance, September 30, 2023 $ (397) $ (123) $ (12) $ (38) $ 5 $ (565) Changes in Accumulated Other Comprehensive Income (Loss) by Component Nine Months 2022 Net Unrealized Gains (Losses) on Investments with: ISCR on Cumulative Cash Flow Total AOCI No Credit Impairment Credit Impairment (in millions) Balance, December 31, 2021 $ 375 $ (24) $ (21) $ (36) $ 6 $ 300 Other comprehensive income (loss) before reclassifications (886) (92) (2) (13) — (993) Less: Amounts reclassified from AOCI to: Net realized investment gains (losses) (35) (13) — — — (48) Fair value gains (losses) on FG VIEs — — (2) — — (2) Total before tax (35) (13) (2) — — (50) Tax (provision) benefit 6 2 1 — — 9 Total amount reclassified from AOCI, net of tax (29) (11) (1) — — (41) Other comprehensive income (loss) (857) (81) (1) (13) — (952) Balance, September 30, 2022 $ (482) $ (105) $ (22) $ (49) $ 6 $ (652)
Schedule of Share Repurchases	Share Repurchases Period Number of Shares Repurchased Total Payments Average Price Paid Per Share 2022 (January 1 - March 31) 2,738,223 $ 155 $ 56.62 2022 (April 1 - June 30) 2,605,947 151 58.03 2022 (July 1- September 30) 1,790,395 97 53.77 2022 (October 1- December 31) 1,713,416 100 58.34 Total 2022 8,847,981 $ 503 56.79 2023 (January 1 - March 31) 36,369 2 62.23 2023 (April 1 - June 30) 453,942 24 53.08 2023 (July 1 - September 30) 1,065,902 64 59.67 2023 (October 1 - November 7) 682,676 42 61.17 Total 2023 2,238,889 $ 132 58.83

Earnings Per Share (Tables)

Earnings Per Share (Tables)	9 Months Ended
	Sep. 30, 2023
Earnings Per Share [Abstract]
Schedule of Computation of Basic and Diluted Earnings Per Share	Computation of Earnings Per Share Third Quarter Nine Months 2023 2022 2023 2022 (in millions, except per share amounts) Basic Earnings Per Share (EPS): Net income (loss) attributable to AGL $ 157 $ 11 $ 363 $ 30 Less: Distributed and undistributed income (loss) available to nonvested shareholders 2 — 3 — Distributed and undistributed income (loss) available to common shareholders of AGL and subsidiaries, basic $ 155 $ 11 $ 360 $ 30 Basic shares 58.5 61.7 58.9 63.9 Basic EPS $ 2.65 $ 0.18 $ 6.11 $ 0.47 Diluted EPS: Distributed and undistributed income (loss) available to common shareholders of AGL and subsidiaries, basic $ 155 $ 11 $ 360 $ 30 Plus: Re-allocation of undistributed income (loss) available to nonvested shareholders of AGL and subsidiaries — — — — Distributed and undistributed income (loss) available to common shareholders of AGL and subsidiaries, diluted $ 155 $ 11 $ 360 $ 30 Basic shares 58.5 61.7 58.9 63.9 Dilutive securities: Restricted stock awards 1.1 1.2 1.1 1.2 Diluted shares 59.6 62.9 60.0 65.1 Diluted EPS $ 2.60 $ 0.18 $ 5.99 $ 0.46 Potentially dilutive securities excluded from computation of EPS because of antidilutive effect 0.1 0.1 0.1 0.8
Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share	Computation of Earnings Per Share Third Quarter Nine Months 2023 2022 2023 2022 (in millions, except per share amounts) Basic Earnings Per Share (EPS): Net income (loss) attributable to AGL $ 157 $ 11 $ 363 $ 30 Less: Distributed and undistributed income (loss) available to nonvested shareholders 2 — 3 — Distributed and undistributed income (loss) available to common shareholders of AGL and subsidiaries, basic $ 155 $ 11 $ 360 $ 30 Basic shares 58.5 61.7 58.9 63.9 Basic EPS $ 2.65 $ 0.18 $ 6.11 $ 0.47 Diluted EPS: Distributed and undistributed income (loss) available to common shareholders of AGL and subsidiaries, basic $ 155 $ 11 $ 360 $ 30 Plus: Re-allocation of undistributed income (loss) available to nonvested shareholders of AGL and subsidiaries — — — — Distributed and undistributed income (loss) available to common shareholders of AGL and subsidiaries, diluted $ 155 $ 11 $ 360 $ 30 Basic shares 58.5 61.7 58.9 63.9 Dilutive securities: Restricted stock awards 1.1 1.2 1.1 1.2 Diluted shares 59.6 62.9 60.0 65.1 Diluted EPS $ 2.60 $ 0.18 $ 5.99 $ 0.46 Potentially dilutive securities excluded from computation of EPS because of antidilutive effect 0.1 0.1 0.1 0.8

Business and Basis of Present_4

Business and Basis of Presentation - Narrative (Details) $ in Millions		3 Months Ended	9 Months Ended
	Jul. 01, 2023 USD ($)	Sep. 30, 2023 USD ($) Company	Sep. 30, 2023 USD ($) Company
Long-Lived Assets Held-for-sale [Line Items]
Number of holding companies with outstanding public debt | Company		2	2
Sound Point Capital Management, LP [Member]
Long-Lived Assets Held-for-sale [Line Items]
Gain on sale of asset management subsidiaries	$ 248
Sound Point Agreement
Long-Lived Assets Held-for-sale [Line Items]
Assets held for sale		$ 4,700	$ 4,700
Liabilities held for sale		4,400	4,400
Disposal Group, Held-for-sale, Not Discontinued Operations
Long-Lived Assets Held-for-sale [Line Items]
Assets held for sale		28	28
Liabilities held for sale		$ 2	2
Disposal Group, Held-for-sale, Not Discontinued Operations | Sound Point Agreement
Long-Lived Assets Held-for-sale [Line Items]
Term to make new investments		2 years
Transaction commitment, new and transitioned investments		$ 1,000
Participation percentage	30%
Expenses recognized		$ 14	$ 46

Business and Basis of Present_5

Business and Basis of Presentation - Gain on Equity Method Investment (Details) $ in Millions		3 Months Ended		9 Months Ended
	Jul. 01, 2023 USD ($) rISK	Sep. 30, 2023 USD ($)	Sep. 30, 2022 USD ($)	Sep. 30, 2023 USD ($)	Sep. 30, 2022 USD ($)	Dec. 31, 2022 USD ($)
Schedule of Equity Method Investments [Line Items]
Equity method investments, fair value	$ 444
Gain on sale of asset management subsidiaries	$ 255	$ 255	$ 0	$ 255	$ 0
Goodwill and other intangible assets		$ 6		$ 6		$ 163
Consolidated Investment Vehicles
Schedule of Equity Method Investments [Line Items]
Number of remaining CIVs | rISK	3
Sound Point Agreement
Schedule of Equity Method Investments [Line Items]
Goodwill and other intangible assets	$ 155
Sound Point Capital Management, LP [Member]
Schedule of Equity Method Investments [Line Items]
Equity method investments, fair value	419
Gain on sale of asset management subsidiaries	248
Equity in earnings (losses) of investees (4)
Schedule of Equity Method Investments [Line Items]
Equity method investments, fair value	25
Assured IM
Schedule of Equity Method Investments [Line Items]
Equity method investments	189
Assured Healthcare Partners LLC
Schedule of Equity Method Investments [Line Items]
Gain on sale of asset management subsidiaries	$ 7

Segment Information - Segment I

Segment Information - Segment Information (Details) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023 USD ($)	Sep. 30, 2022 USD ($)	Sep. 30, 2023 USD ($) segment	Sep. 30, 2022 USD ($)
Segment Reporting [Abstract]
Number of reportable segments | segment			2
Segment Reporting Information [Line Items]
Revenues	$ 403	$ 41	$ 1,046	$ 431
Segment expenses	219	43	605	351
Segment equity in earnings (losses) of investees	18	(20)	25	(31)
Less: Provision (benefit) for income taxes	43	(27)	84	(6)
Operating Segments
Segment Reporting Information [Line Items]
Revenues	208	168	693	652
Segment expenses	165	8	429	238
Segment equity in earnings (losses) of investees	25	(11)	60	(46)
Less: Provision (benefit) for income taxes	9	(7)	45	24
Insurance | Operating Segments Excluding Intersegment Elimination
Segment Reporting Information [Line Items]
Revenues	206	145	615	558
Insurance | Intersegment Eliminations
Segment Reporting Information [Line Items]
Revenues	(2)	(2)	(7)	(6)
Insurance | Operating Segments
Segment Reporting Information [Line Items]
Revenues	208	147	622	564
Segment expenses	165	(16)	354	147
Segment equity in earnings (losses) of investees	25	(11)	60	(46)
Less: Provision (benefit) for income taxes	9	(7)	46	24
Segment adjusted operating income (loss)	59	159	282	347
Asset Management | Operating Segments Excluding Intersegment Elimination
Segment Reporting Information [Line Items]
Revenues	0	13	44	59
Asset Management | Intersegment Eliminations
Segment Reporting Information [Line Items]
Revenues	0	(8)	(27)	(29)
Asset Management | Operating Segments
Segment Reporting Information [Line Items]
Revenues	0	21	71	88
Segment expenses	0	24	75	91
Segment equity in earnings (losses) of investees	0	0	0	0
Less: Provision (benefit) for income taxes	0	0	(1)	0
Segment adjusted operating income (loss)	$ 0	$ (3)	$ (3)	$ (3)

Segment Information - Reconcili

Segment Information - Reconciliation of Net Income (Loss) Attributable to AGL to Segment Adjusted Operating Income (Loss) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Segment Reporting Information [Line Items]
Revenues	$ 403	$ 41	$ 1,046	$ 431
Expenses	219	43	605	351
Equity in Earnings (Losses) of Investees	18	(20)	25	(31)
Less: Provision (benefit) for income taxes	43	(27)	84	(6)
Less: Noncontrolling interests	2	(6)	19	25
Net Income (Loss) Attributable to AGL	157	11	363	30
Subtotal
Segment Reporting Information [Line Items]
Revenues	463	182	984	689
Expenses	219	44	606	356
Equity in Earnings (Losses) of Investees	18	(20)	25	(31)
Less: Provision (benefit) for income taxes	54	(9)	74	24
Less: Noncontrolling interests	2	(6)	19	25
Net Income (Loss) Attributable to AGL	206	133	310	253
Operating Segments
Segment Reporting Information [Line Items]
Revenues	208	168	693	652
Expenses	165	8	429	238
Equity in Earnings (Losses) of Investees	25	(11)	60	(46)
Less: Provision (benefit) for income taxes	9	(7)	45	24
Less: Noncontrolling interests	0	0	0	0
Net Income (Loss) Attributable to AGL	59	156	279	344
Operating Segments | Insurance
Segment Reporting Information [Line Items]
Revenues	208	147	622	564
Expenses	165	(16)	354	147
Equity in Earnings (Losses) of Investees	25	(11)	60	(46)
Less: Provision (benefit) for income taxes	9	(7)	46	24
Less: Noncontrolling interests	0	0	0	0
Net Income (Loss) Attributable to AGL	59	159	282	347
Operating Segments | Asset Management
Segment Reporting Information [Line Items]
Revenues	0	21	71	88
Expenses	0	24	75	91
Equity in Earnings (Losses) of Investees	0	0	0	0
Less: Provision (benefit) for income taxes	0	0	(1)	0
Less: Noncontrolling interests	0	0	0	0
Net Income (Loss) Attributable to AGL	0	(3)	(3)	(3)
Corporate division
Segment Reporting Information [Line Items]
Revenues	259	1	263	3
Expenses	57	34	165	104
Equity in Earnings (Losses) of Investees	0	0	0	0
Less: Provision (benefit) for income taxes	47	(3)	37	(3)
Less: Noncontrolling interests	0	0	0	0
Net Income (Loss) Attributable to AGL	155	(30)	61	(98)
Other
Segment Reporting Information [Line Items]
Revenues	(4)	13	28	34
Expenses	(3)	2	12	14
Equity in Earnings (Losses) of Investees	(7)	(9)	(35)	15
Less: Provision (benefit) for income taxes	(2)	1	(8)	3
Less: Noncontrolling interests	2	(6)	19	25
Net Income (Loss) Attributable to AGL	(8)	7	(30)	7
Reconciling items:
Segment Reporting Information [Line Items]
Expenses		(1)	(1)	(5)
Less: Provision (benefit) for income taxes	11	18	(10)	30
Reconciling items: | Realized gains (losses) on investments
Segment Reporting Information [Line Items]
Revenues	(9)	(14)	(20)	(39)
Net Income (Loss) Attributable to AGL	(9)	(14)	(20)	(39)
Reconciling items: | Non-credit impairment-related unrealized fair value gains (losses) on credit derivatives
Segment Reporting Information [Line Items]
Revenues	6	(50)	108	(51)
Net Income (Loss) Attributable to AGL	6	(49)	109	(46)
Reconciling items: | Fair value gains (losses) on CCS
Segment Reporting Information [Line Items]
Revenues	(20)	1	(35)	12
Net Income (Loss) Attributable to AGL	(20)	1	(35)	12
Reconciling items: | Foreign exchange gains (losses) on remeasurement of premiums receivable and loss and LAE reserves
Segment Reporting Information [Line Items]
Revenues	(37)	(78)	9	(180)
Net Income (Loss) Attributable to AGL	(37)	(78)	9	(180)
Reconciling items: | Tax effect
Segment Reporting Information [Line Items]
Net Income (Loss) Attributable to AGL	$ (11)	$ (18)	$ 10	$ (30)

Outstanding Exposure - Addition

Outstanding Exposure - Additional Information (Details) $ in Millions		9 Months Ended
	Jun. 26, 2023 USD ($)	Sep. 30, 2023 USD ($) Category	Aug. 31, 2023 USD ($)	Jun. 23, 2023 USD ($)	Dec. 31, 2022 USD ($)
Schedule of Insured Financial Obligations [Line Items]
Number of surveillance categories | Category		3
Loss Mitigation Securities		$ 1,200			$ 1,300
Net par outstanding		241,833	$ 108		233,258
Guarantor, maximum exposure		1,600
Puerto Rico Electric Power Authority
Schedule of Insured Financial Obligations [Line Items]
Plaintiff debt capacity				$ 2,500
Plaintiff debt capacity allocated to settling creditors				1,400
Plaintiff debt capacity allocated to bondholders and general unsecured creditors				$ 1,100
Claim received as restructuring bonds, percent				12.50%
Puerto Rico Electric Power Authority | Guarantee Obligations
Schedule of Insured Financial Obligations [Line Items]
Damages sought, estimate	$ 2,400
Calculated collection period	100 years
Calculated discount rate	7%
Calculated discounted cash flows	$ 3,000
Additional calculated riscount rate	20%
Damages sought	$ 8,500
Puerto Rico
Schedule of Insured Financial Obligations [Line Items]
Net par outstanding		1,105			1,361
Puerto Rico | Other Public Corporations
Schedule of Insured Financial Obligations [Line Items]
Net par outstanding		109
Puerto Rico | PRHTA
Schedule of Insured Financial Obligations [Line Items]
Net par outstanding		372
Public finance
Schedule of Insured Financial Obligations [Line Items]
Net par outstanding		231,721			224,099
Structured finance
Schedule of Insured Financial Obligations [Line Items]
Net par outstanding		10,112			9,159
Aircraft residual value insurance (RVI)
Schedule of Insured Financial Obligations [Line Items]
Residual value insurance policies exposure downgraded		355			355
Net Exposure		200			200
Commitment to Provide Guarantees | Public finance
Schedule of Insured Financial Obligations [Line Items]
Outstanding commitments to provide guaranties		1,500
Commitment to Provide Guarantees | Structured finance
Schedule of Insured Financial Obligations [Line Items]
Outstanding commitments to provide guaranties		$ 1,300
BIG
Schedule of Insured Financial Obligations [Line Items]
Maximum period of liquidity claims (in years)		1 year
Net par outstanding		$ 5,174			5,892
BIG | Puerto Rico
Schedule of Insured Financial Obligations [Line Items]
Net par outstanding		1,100			1,400
BIG | Public finance
Schedule of Insured Financial Obligations [Line Items]
Net par outstanding		4,122			4,777
BIG | Structured finance
Schedule of Insured Financial Obligations [Line Items]
Net par outstanding		1,052			1,115
BIG | Aircraft residual value insurance (RVI)
Schedule of Insured Financial Obligations [Line Items]
Residual value insurance policies exposure downgraded		144			144
Net Exposure		$ 84			$ 84
Minimum
Schedule of Insured Financial Obligations [Line Items]
Probability of paying more claims than being reimbursed (as a percent)		50%

Outstanding Exposure - Debt Ser

Outstanding Exposure - Debt Service Outstanding (Details) - USD ($) $ in Millions	Sep. 30, 2023	Aug. 31, 2023	Dec. 31, 2022
Debt Service
Gross	$ 384,198		$ 370,172
Net	383,976		369,951
Par Outstanding
Gross	242,009		233,438
Net	241,833	$ 108	233,258
Public finance
Debt Service
Gross	372,908		359,899
Net	372,711		359,703
Par Outstanding
Gross	231,871		224,254
Net	231,721		224,099
Structured finance
Debt Service
Gross	11,290		10,273
Net	11,265		10,248
Par Outstanding
Gross	10,138		9,184
Net	$ 10,112		$ 9,159

Outstanding Exposure - Financia

Outstanding Exposure - Financial Guaranty Portfolio by Internal Rating (Details) - USD ($) $ in Millions	Sep. 30, 2023	Aug. 31, 2023	Dec. 31, 2022
Schedule of Insured Financial Obligations [Line Items]
Net	$ 241,833	$ 108	$ 233,258
% of total net par outstanding	100%		100%
AAA
Schedule of Insured Financial Obligations [Line Items]
Net	$ 3,533		$ 3,584
% of total net par outstanding	1.50%		1.50%
AA
Schedule of Insured Financial Obligations [Line Items]
Net	$ 24,849		$ 24,383
% of total net par outstanding	10.30%		10.50%
A
Schedule of Insured Financial Obligations [Line Items]
Net	$ 114,288		$ 107,493
% of total net par outstanding	47.20%		46.10%
BBB
Schedule of Insured Financial Obligations [Line Items]
Net	$ 93,989		$ 91,906
% of total net par outstanding	38.90%		39.40%
BIG
Schedule of Insured Financial Obligations [Line Items]
Net	$ 5,174		$ 5,892
% of total net par outstanding	2.10%		2.50%
Public finance
Schedule of Insured Financial Obligations [Line Items]
Net	$ 231,721		$ 224,099
Public finance | United States
Schedule of Insured Financial Obligations [Line Items]
Net	$ 185,973		$ 179,636
% of total net par outstanding	100%		100%
Public finance | Non-U.S. public finance
Schedule of Insured Financial Obligations [Line Items]
Net	$ 45,748		$ 44,463
% of total net par outstanding	100%		100%
Public finance | AAA | United States
Schedule of Insured Financial Obligations [Line Items]
Net	$ 212		$ 222
% of total net par outstanding	0.10%		0.10%
Public finance | AAA | Non-U.S. public finance
Schedule of Insured Financial Obligations [Line Items]
Net	$ 2,004		$ 1,967
% of total net par outstanding	4.40%		4.40%
Public finance | AA | United States
Schedule of Insured Financial Obligations [Line Items]
Net	$ 16,994		$ 16,241
% of total net par outstanding	9.10%		9.10%
Public finance | AA | Non-U.S. public finance
Schedule of Insured Financial Obligations [Line Items]
Net	$ 3,298		$ 3,497
% of total net par outstanding	7.20%		7.90%
Public finance | A | United States
Schedule of Insured Financial Obligations [Line Items]
Net	$ 101,243		$ 96,807
% of total net par outstanding	54.50%		53.90%
Public finance | A | Non-U.S. public finance
Schedule of Insured Financial Obligations [Line Items]
Net	$ 10,545		$ 9,271
% of total net par outstanding	23.10%		20.90%
Public finance | BBB | United States
Schedule of Insured Financial Obligations [Line Items]
Net	$ 64,220		$ 62,570
% of total net par outstanding	34.50%		34.80%
Public finance | BBB | Non-U.S. public finance
Schedule of Insured Financial Obligations [Line Items]
Net	$ 29,083		$ 28,747
% of total net par outstanding	63.50%		64.60%
Public finance | BIG
Schedule of Insured Financial Obligations [Line Items]
Net	$ 4,122		$ 4,777
Public finance | BIG | United States
Schedule of Insured Financial Obligations [Line Items]
Net	$ 3,304		$ 3,796
% of total net par outstanding	1.80%		2.10%
Public finance | BIG | Non-U.S. public finance
Schedule of Insured Financial Obligations [Line Items]
Net	$ 818		$ 981
% of total net par outstanding	1.80%		2.20%
Structured finance
Schedule of Insured Financial Obligations [Line Items]
Net	$ 10,112		$ 9,159
Structured finance | United States
Schedule of Insured Financial Obligations [Line Items]
Net	$ 8,975		$ 8,228
% of total net par outstanding	100%		100%
Structured finance | Non-U.S. public finance
Schedule of Insured Financial Obligations [Line Items]
Net	$ 1,137		$ 931
% of total net par outstanding	100%		100%
Structured finance | AAA | United States
Schedule of Insured Financial Obligations [Line Items]
Net	$ 860		$ 926
% of total net par outstanding	9.60%		11.20%
Structured finance | AAA | Non-U.S. public finance
Schedule of Insured Financial Obligations [Line Items]
Net	$ 457		$ 469
% of total net par outstanding	40.20%		50.40%
Structured finance | AA | United States
Schedule of Insured Financial Obligations [Line Items]
Net	$ 4,545		$ 4,633
% of total net par outstanding	50.70%		56.30%
Structured finance | AA | Non-U.S. public finance
Schedule of Insured Financial Obligations [Line Items]
Net	$ 12		$ 12
% of total net par outstanding	1%		1.30%
Structured finance | A | United States
Schedule of Insured Financial Obligations [Line Items]
Net	$ 1,932		$ 1,075
% of total net par outstanding	21.50%		13.10%
Structured finance | A | Non-U.S. public finance
Schedule of Insured Financial Obligations [Line Items]
Net	$ 568		$ 340
% of total net par outstanding	50%		36.50%
Structured finance | BBB | United States
Schedule of Insured Financial Obligations [Line Items]
Net	$ 586		$ 479
% of total net par outstanding	6.50%		5.80%
Structured finance | BBB | Non-U.S. public finance
Schedule of Insured Financial Obligations [Line Items]
Net	$ 100		$ 110
% of total net par outstanding	8.80%		11.80%
Structured finance | BIG
Schedule of Insured Financial Obligations [Line Items]
Net	$ 1,052		$ 1,115
Structured finance | BIG | United States
Schedule of Insured Financial Obligations [Line Items]
Net	$ 1,052		$ 1,115
% of total net par outstanding	11.70%		13.60%
Structured finance | BIG | Non-U.S. public finance
Schedule of Insured Financial Obligations [Line Items]
Net	$ 0		$ 0
% of total net par outstanding	0%		0%

Outstanding Exposure - Componen

Outstanding Exposure - Components of BIG Net Par Outstanding (Details) - USD ($) $ in Millions	Sep. 30, 2023	Aug. 31, 2023	Dec. 31, 2022
Schedule of Insured Financial Obligations [Line Items]
Net	$ 241,833	$ 108	$ 233,258
Public finance
Schedule of Insured Financial Obligations [Line Items]
Net	231,721		224,099
Other structured finance
Schedule of Insured Financial Obligations [Line Items]
Net	8,295		7,203
Structured finance
Schedule of Insured Financial Obligations [Line Items]
Net	10,112		9,159
BIG
Schedule of Insured Financial Obligations [Line Items]
Net	5,174		5,892
BIG | Public finance
Schedule of Insured Financial Obligations [Line Items]
Net	4,122		4,777
BIG | Other structured finance
Schedule of Insured Financial Obligations [Line Items]
Net	96		105
BIG | Structured finance
Schedule of Insured Financial Obligations [Line Items]
Net	1,052		1,115
BIG | BIG 1
Schedule of Insured Financial Obligations [Line Items]
Net	2,131		3,363
BIG | BIG 1 | Public finance
Schedule of Insured Financial Obligations [Line Items]
Net	2,108		3,345
BIG | BIG 1 | Other structured finance
Schedule of Insured Financial Obligations [Line Items]
Net	0		0
BIG | BIG 1 | Structured finance
Schedule of Insured Financial Obligations [Line Items]
Net	23		18
BIG | BIG 2
Schedule of Insured Financial Obligations [Line Items]
Net	990		181
BIG | BIG 2 | Public finance
Schedule of Insured Financial Obligations [Line Items]
Net	926		108
BIG | BIG 2 | Other structured finance
Schedule of Insured Financial Obligations [Line Items]
Net	28		34
BIG | BIG 2 | Structured finance
Schedule of Insured Financial Obligations [Line Items]
Net	64		73
BIG | BIG 3
Schedule of Insured Financial Obligations [Line Items]
Net	2,053		2,348
BIG | BIG 3 | Public finance
Schedule of Insured Financial Obligations [Line Items]
Net	1,088		1,324
BIG | BIG 3 | Other structured finance
Schedule of Insured Financial Obligations [Line Items]
Net	68		71
BIG | BIG 3 | Structured finance
Schedule of Insured Financial Obligations [Line Items]
Net	965		1,024
United States | Public finance
Schedule of Insured Financial Obligations [Line Items]
Net	185,973		179,636
United States | RMBS
Schedule of Insured Financial Obligations [Line Items]
Net	1,817		1,956
United States | Structured finance
Schedule of Insured Financial Obligations [Line Items]
Net	8,975		8,228
United States | BIG | Public finance
Schedule of Insured Financial Obligations [Line Items]
Net	3,304		3,796
United States | BIG | RMBS
Schedule of Insured Financial Obligations [Line Items]
Net	956		1,010
United States | BIG | Structured finance
Schedule of Insured Financial Obligations [Line Items]
Net	1,052		1,115
United States | BIG | BIG 1 | Public finance
Schedule of Insured Financial Obligations [Line Items]
Net	1,290		2,364
United States | BIG | BIG 1 | RMBS
Schedule of Insured Financial Obligations [Line Items]
Net	23		18
United States | BIG | BIG 2 | Public finance
Schedule of Insured Financial Obligations [Line Items]
Net	926		108
United States | BIG | BIG 2 | RMBS
Schedule of Insured Financial Obligations [Line Items]
Net	36		39
United States | BIG | BIG 3 | Public finance
Schedule of Insured Financial Obligations [Line Items]
Net	1,088		1,324
United States | BIG | BIG 3 | RMBS
Schedule of Insured Financial Obligations [Line Items]
Net	897		953
Non-U.S. public finance | Public finance
Schedule of Insured Financial Obligations [Line Items]
Net	45,748		44,463
Non-U.S. public finance | Structured finance
Schedule of Insured Financial Obligations [Line Items]
Net	1,137		931
Non-U.S. public finance | BIG | Public finance
Schedule of Insured Financial Obligations [Line Items]
Net	818		981
Non-U.S. public finance | BIG | Structured finance
Schedule of Insured Financial Obligations [Line Items]
Net	0		0
Non-U.S. public finance | BIG | BIG 1 | Public finance
Schedule of Insured Financial Obligations [Line Items]
Net	818		981
Non-U.S. public finance | BIG | BIG 2 | Public finance
Schedule of Insured Financial Obligations [Line Items]
Net	0		0
Non-U.S. public finance | BIG | BIG 3 | Public finance
Schedule of Insured Financial Obligations [Line Items]
Net	$ 0		$ 0

Outstanding Exposure - BIG Net

Outstanding Exposure - BIG Net Par Outstanding (Details) $ in Millions	Sep. 30, 2023 USD ($) risk	Aug. 31, 2023 USD ($)	Dec. 31, 2022 USD ($) risk
Schedule of Insured Financial Obligations [Line Items]
Net par outstanding, credit derivative	$ 3,489		$ 3,203
Net	241,833	$ 108	233,258
BIG
Schedule of Insured Financial Obligations [Line Items]
Net par outstanding, financial guaranty insurance	5,119		5,835
Net par outstanding, credit derivative	55		57
Net	$ 5,174		$ 5,892
Number of risks, financial guaranty insurance | risk	224		247
Number of risks, credit derivative | risk	11		13
Number of risks | risk	235		260
BIG | BIG 1
Schedule of Insured Financial Obligations [Line Items]
Net par outstanding, financial guaranty insurance	$ 2,115		$ 3,357
Net par outstanding, credit derivative	16		6
Net	$ 2,131		$ 3,363
Number of risks, financial guaranty insurance | risk	102		122
Number of risks, credit derivative | risk	2		1
Number of risks | risk	104		123
BIG | BIG 2
Schedule of Insured Financial Obligations [Line Items]
Net par outstanding, financial guaranty insurance	$ 980		$ 171
Net par outstanding, credit derivative	10		10
Net	$ 990		$ 181
Number of risks, financial guaranty insurance | risk	13		14
Number of risks, credit derivative | risk	2		2
Number of risks | risk	15		16
BIG | BIG 3
Schedule of Insured Financial Obligations [Line Items]
Net par outstanding, financial guaranty insurance	$ 2,024		$ 2,307
Net par outstanding, credit derivative	29		41
Net	$ 2,053		$ 2,348
Number of risks, financial guaranty insurance | risk	109		111
Number of risks, credit derivative | risk	7		10
Number of risks | risk	116		121

Outstanding Exposure - Puerto R

Outstanding Exposure - Puerto Rico Gross Par and Gross Debt Service Outstanding (Details) - USD ($) $ in Millions	Sep. 30, 2023	Dec. 31, 2022
Schedule of Insured Financial Obligations [Line Items]
Exposure to Puerto Rico	$ 242,009	$ 233,438
Gross	384,198	370,172
Puerto Rico
Schedule of Insured Financial Obligations [Line Items]
Exposure to Puerto Rico	1,121	1,378
Gross	$ 1,529	$ 1,899

Outstanding Exposure - Puerto_2

Outstanding Exposure - Puerto Rico Net Par Outstanding (Details) - USD ($) $ in Millions	Sep. 30, 2023	Aug. 31, 2023	Dec. 31, 2022
Schedule of Insured Financial Obligations [Line Items]
Net	$ 241,833	$ 108	$ 233,258
Puerto Rico
Schedule of Insured Financial Obligations [Line Items]
Net	1,105		1,361
Puerto Rico | Other Puerto Rico Exposure
Schedule of Insured Financial Obligations [Line Items]
Net	109		132
Puerto Rico | Other Puerto Rico Exposure | MFA
Schedule of Insured Financial Obligations [Line Items]
Net	108		131
Puerto Rico | Other Puerto Rico Exposure | PRASA and U of PR
Schedule of Insured Financial Obligations [Line Items]
Net	1		1
Puerto Rico | Puerto Rico Defaulted Exposures Subject to a Plan Support Agreement | Puerto Rico Electric Power Authority
Schedule of Insured Financial Obligations [Line Items]
Net	624		720
Puerto Rico | Puerto Rico Resolved Exposures Subject to a Plan Support Agreement
Schedule of Insured Financial Obligations [Line Items]
Net	372		509
Puerto Rico | Puerto Rico Resolved Exposures Subject to a Plan Support Agreement | Puerto Rico Transportation Authority
Schedule of Insured Financial Obligations [Line Items]
Net	244		298
Puerto Rico | Puerto Rico Resolved Exposures Subject to a Plan Support Agreement | Puerto Rico Highways Authority
Schedule of Insured Financial Obligations [Line Items]
Net	128		182
Puerto Rico | Puerto Rico Resolved Exposures Subject to a Plan Support Agreement | Commonwealth of Puerto Rico
Schedule of Insured Financial Obligations [Line Items]
Net	0		25
Puerto Rico | Puerto Rico Resolved Exposures Subject to a Plan Support Agreement | PBA
Schedule of Insured Financial Obligations [Line Items]
Net	$ 0		$ 4

Outstanding Exposure - Amortiza

Outstanding Exposure - Amortization Schedule of Puerto Rico Net Par Outstanding and Net Debt Service Outstanding (Details) - USD ($) $ in Millions	Sep. 30, 2023	Aug. 31, 2023	Dec. 31, 2022
Scheduled Net Par Amortization
Total	$ 241,833	$ 108	$ 233,258
Scheduled Net Debt Service Amortization
Total	383,976		369,951
Puerto Rico
Scheduled Net Par Amortization
2023 (October 1 - December 31)	0
2024 (January 1 - March 31)	0
2024 (April 1 - June 30)	0
2024 (July 1 - September 30)	110
2023 (October 1 - December 31)	0
Subtotal 2024	110
2025	84
2026	140
2027	120
2028-2032	293
2033-2037	235
2038-2041	123
Total	1,105		$ 1,361
Scheduled Net Debt Service Amortization
2023 (October 1 - December 31)	3
2024 (January 1 - March 31)	24
2024 (April 1 - June 30)	3
2024 (July 1 - September 30)	134
2024 (October 1 - December 31)	3
Subtotal 2024	164
2025	132
2026	185
2027	158
2028-2032	427
2033-2037	302
2038-2041	140
Total	$ 1,511

Outstanding Exposure - Schedule

Outstanding Exposure - Schedule of Non-Financial Guaranty Exposure (Details) - USD ($) $ in Millions	Sep. 30, 2023	Dec. 31, 2022
Life insurance transactions
Schedule of Insured Financial Obligations [Line Items]
Gross Exposure	$ 1,325	$ 1,314
Net Exposure	1,003	986
Life insurance transactions | Maximum
Schedule of Insured Financial Obligations [Line Items]
Net Exposure	1,100
Aircraft residual value insurance policies
Schedule of Insured Financial Obligations [Line Items]
Gross Exposure	355	355
Net Exposure	200	200
Other guaranties
Schedule of Insured Financial Obligations [Line Items]
Gross Exposure	2,090	228
Net Exposure	$ 2,090	$ 228

Expected Loss to be Paid (Rec_3

Expected Loss to be Paid (Recovered) - Additional Information (Details) $ in Millions	3 Months Ended			6 Months Ended	9 Months Ended		12 Months Ended
	Sep. 30, 2023 USD ($)	Mar. 31, 2023	Sep. 30, 2022 USD ($)	Jun. 30, 2023 USD ($)	Sep. 30, 2023 USD ($) Payment Curve scenario	Sep. 30, 2022 USD ($)	Dec. 31, 2022 USD ($) scenario	Jun. 30, 2022 USD ($)	Dec. 31, 2021 USD ($)
Schedule of Expected Losses to be Paid [Line Items]
Period of insured credit performance of guaranteed obligations (in some cases over)					30 years
Discount factor (as a percent)					4.80%		4.08%
Net Expected Loss to be Paid (Recovered)	$ 490		$ 727	$ 560	$ 490	$ 727	$ 522	$ 442	$ 411
Loss and LAE Reserve paid	9		5		17	25
Expected LAE to be paid	29				29		11
Net economic loss development (benefit)	87		(72)		$ 147	(148)
Additional loss recovery assumption, recovery period					5 years
First Lien
Schedule of Expected Losses to be Paid [Line Items]
Effect of recovery					$ 7
Second Lien
Schedule of Expected Losses to be Paid [Line Items]
Effect of recovery					31
Public finance
Schedule of Expected Losses to be Paid [Line Items]
Net Expected Loss to be Paid (Recovered)	408		632	443	408	632	412	217	209
Net economic loss development (benefit)	134		22		193	(22)
Other structured finance
Schedule of Expected Losses to be Paid [Line Items]
Net Expected Loss to be Paid (Recovered)	44		43	44	44	43	$ 44	46	52
Net economic loss development (benefit)	1		1		$ 6	1
United States
Schedule of Expected Losses to be Paid [Line Items]
Net expected loss to be paid after recoveries for representations and warranties, percent					98.20%		98.50%
United States | Public finance
Schedule of Expected Losses to be Paid [Line Items]
Net Expected Loss to be Paid (Recovered)	399		626	433	$ 399	626	$ 403	210	197
Net economic loss development (benefit)	135		24		193	(16)
United States | RMBS
Schedule of Expected Losses to be Paid [Line Items]
Net Expected Loss to be Paid (Recovered)	38		52	$ 73	38	52	$ 66	$ 179	$ 150
Net economic loss development (benefit)	(48)		(95)		(52)	(127)
United States | RMBS | First Lien
Schedule of Expected Losses to be Paid [Line Items]
Net economic loss development (benefit)	$ (12)		(38)		$ (12)	(34)
Number of delinquent payments | Payment					2
Projected loss assumptions, CDR, plateau rate, projection period					36 months
Projected loss assumptions, final CPR, period for voluntary prepayments to continue					12 months
Intermediate conditional default rate (as a percent)	5%				5%
Number of scenarios weighted in estimating expected losses | scenario					5		5
United States | RMBS | First Lien | Base Scenario
Schedule of Expected Losses to be Paid [Line Items]
Percent of deferred loan balances to be recovered	30%			20%
United States | RMBS | First Lien | More Stressful Environment
Schedule of Expected Losses to be Paid [Line Items]
Percent of deferred loan balances to be recovered		10%
United States | RMBS | First Lien | Least Stressful Environment
Schedule of Expected Losses to be Paid [Line Items]
Percent of deferred loan balances to be recovered		50%
United States | RMBS | First Lien | Base Scenario
Schedule of Expected Losses to be Paid [Line Items]
Projected loss assumptions, CDR, plateau rate, projection period					36 months
Period from plateau to intermediate conditional default rate (in months)					12 months
Final conditional default rate as a percentage of plateau conditional default rate					5%
Projected loss assumptions, final CPR, period for voluntary prepayments to continue					1 year
Default from delinquentor rate, term					36 months
Performing or projected to reperform, projection period					36 months
Projected loss assumptions, loss severity, subsequent period					18 months
Estimated loss severity rate, one through six months (as a percent)					18 months
Loss severity (as a percent)	40%				40%
Projected loss assumptions, period to reach final loss severity rate					2 years 6 months
Final CPR	15%				15%
United States | RMBS | First Lien | More Stressful Environment
Schedule of Expected Losses to be Paid [Line Items]
Period from plateau to intermediate conditional default rate (in months)					16 months
Projected loss assumptions, period to reach final loss severity rate					9 years
Percent of deferred loan balances to be recovered					10%
Projected loss assumptions, increase (decrease) in expected loss to be paid, net					$ 28
United States | RMBS | First Lien | Least Stressful Environment
Schedule of Expected Losses to be Paid [Line Items]
Projected loss assumptions, CDR, plateau rate, projection period					30 months
Period from plateau to intermediate conditional default rate (in months)					8 months
Percent of deferred loan balances to be recovered					50%
Projected loss assumptions, increase (decrease) in expected loss to be paid, net					$ (20)
Decrease in the plateau period used to calculate potential change in loss estimate (in months)					6 months
United States | RMBS | Second Lien
Schedule of Expected Losses to be Paid [Line Items]
Net economic loss development (benefit)	$ (36)		$ (57)		$ (40)	$ (93)
Projected loss assumptions, period of consistent conditional default rate					36 months
Period of conditional default rate downward trend					1 year
Percent of original period of consistent conditional default rate					5%
Loss recovery assumption (as a percent)	2%				2%		2%
Liquidation rate	40%			30%	40%
Number of conditional default rate curves modeled in estimating losses | Curve					5
United States | RMBS | Second Lien | More Stressful Environment
Schedule of Expected Losses to be Paid [Line Items]
Percent of deferred loan balances to be recovered					10%
United States | RMBS | Second Lien | Least Stressful Environment
Schedule of Expected Losses to be Paid [Line Items]
Percent of deferred loan balances to be recovered					80%
United States | RMBS | Second Lien | Home Equity Line of Credit and Closed-end Mortgage
Schedule of Expected Losses to be Paid [Line Items]
Final CPR	15%				15%
United States | RMBS | Second Lien | More Stressful Environment
Schedule of Expected Losses to be Paid [Line Items]
Projected loss assumptions, CDR, plateau rate, projection period					42 months
Period from plateau to intermediate conditional default rate (in months)					16 months
Stress period (in months)					58 months
Increase in conditional default rate ramp down period					4 months
United States | RMBS | Second Lien | More Stressful Environment | Home Equity Line of Credit
Schedule of Expected Losses to be Paid [Line Items]
Change in estimate for increased conditional default rate plateau period					$ 89
United States | RMBS | Second Lien | Least Stressful Environment
Schedule of Expected Losses to be Paid [Line Items]
Stress period (in months)					38 months
Period of constant conditional default rate (in months)					30 months
Decreased conditional default rate ramp down period					8 months
Change in estimate for decreased prepayment rate, Percent					10%
United States | RMBS | Second Lien | Least Stressful Environment | Home Equity Line of Credit
Schedule of Expected Losses to be Paid [Line Items]
Change in estimate for decreased conditional default rate ramp down period					$ 120
United States | Home Equity Line of Credit
Schedule of Expected Losses to be Paid [Line Items]
Initial period for which borrower can pay only interest payments					10 years
United States | Home Equity Line of Credit Insured
Schedule of Expected Losses to be Paid [Line Items]
Initial period for which borrower can pay only interest payments					15 years
Minimum
Schedule of Expected Losses to be Paid [Line Items]
Risk free discount rate					4.51%		3.82%
Maximum
Schedule of Expected Losses to be Paid [Line Items]
Risk free discount rate					5.45%		4.69%

Expected Loss to be Paid (Rec_4

Expected Loss to be Paid (Recovered) - Net Expected Loss to be Paid (Recovered) and Net Economic Loss Development (Benefit) by Accounting Model (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022	Jun. 30, 2023	Dec. 31, 2022	Jun. 30, 2022	Dec. 31, 2021
Schedule of Expected Losses to be Paid [Line Items]
Net Expected Loss to be Paid (Recovered)	$ 490	$ 727	$ 490	$ 727	$ 560	$ 522	$ 442	$ 411
Net economic loss development (benefit)	87	(72)	147	(148)
Insurance
Schedule of Expected Losses to be Paid [Line Items]
Net Expected Loss to be Paid (Recovered)	252		252			205
Net economic loss development (benefit)	92	(67)	160	(137)
FG VIEs' assets
Schedule of Expected Losses to be Paid [Line Items]
Net Expected Loss to be Paid (Recovered)	235		235			314
Net economic loss development (benefit)	(6)	(6)	(15)	(16)
Credit derivatives
Schedule of Expected Losses to be Paid [Line Items]
Net Expected Loss to be Paid (Recovered)	3		3			$ 3
Net economic loss development (benefit)	$ 1	$ 1	$ 2	$ 5

Expected Loss to be Paid (Rec_5

Expected Loss to be Paid (Recovered) - Net Expected Loss to be Paid After Net Expected Recoveries for Breaches of R&W Rollforward (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022	Dec. 31, 2022
Present Value of Net Expected Loss and Loss Adjustment Expenses to be Paid [Roll Forward]
Net expected loss to be paid (recovered), beginning of period	$ 560	$ 442	$ 522	$ 411	$ 411
Accretion of discount	6	3	15	8
Changes in discount rates	(12)	(25)	(8)	(114)
Changes in timing and assumptions	93	(50)	140	(42)
Total economic loss development (benefit)	87	(72)	147	(148)
Net (paid) recovered losses	(157)	357	(179)	464
Net expected loss to be paid (recovered), end of period	490	727	$ 490	727	$ 522
Weighted average risk free discount rate			4.80%		4.08%
Period after the end of the reporting period within which the ceded paid losses are typically settled (in days)			45 days
Minimum
Present Value of Net Expected Loss and Loss Adjustment Expenses to be Paid [Roll Forward]
Risk free discount rate			4.51%		3.82%
Maximum
Present Value of Net Expected Loss and Loss Adjustment Expenses to be Paid [Roll Forward]
Risk free discount rate			5.45%		4.69%
United States
Present Value of Net Expected Loss and Loss Adjustment Expenses to be Paid [Roll Forward]
Net expected loss to be paid after recoveries for representations and warranties, percent			98.20%		98.50%
Public finance
Present Value of Net Expected Loss and Loss Adjustment Expenses to be Paid [Roll Forward]
Net expected loss to be paid (recovered), beginning of period	443	217	$ 412	209	$ 209
Total economic loss development (benefit)	134	22	193	(22)
Net (paid) recovered losses	(169)	393	(197)	445
Net expected loss to be paid (recovered), end of period	408	632	408	632	412
Public finance | United States
Present Value of Net Expected Loss and Loss Adjustment Expenses to be Paid [Roll Forward]
Net expected loss to be paid (recovered), beginning of period	433	210	403	197	197
Total economic loss development (benefit)	135	24	193	(16)
Net (paid) recovered losses	(169)	392	(197)	445
Net expected loss to be paid (recovered), end of period	399	626	399	626	403
Public finance | Non-U.S. public finance
Present Value of Net Expected Loss and Loss Adjustment Expenses to be Paid [Roll Forward]
Net expected loss to be paid (recovered), beginning of period	10	7	9	12	12
Total economic loss development (benefit)	(1)	(2)	0	(6)
Net (paid) recovered losses	0	1	0	0
Net expected loss to be paid (recovered), end of period	9	6	9	6	9
RMBS | United States
Present Value of Net Expected Loss and Loss Adjustment Expenses to be Paid [Roll Forward]
Net expected loss to be paid (recovered), beginning of period	73	179	66	150	150
Total economic loss development (benefit)	(48)	(95)	(52)	(127)
Net (paid) recovered losses	13	(32)	24	29
Net expected loss to be paid (recovered), end of period	38	52	38	52	66
Other structured finance
Present Value of Net Expected Loss and Loss Adjustment Expenses to be Paid [Roll Forward]
Net expected loss to be paid (recovered), beginning of period	44	46	44	52	52
Total economic loss development (benefit)	1	1	6	1
Net (paid) recovered losses	(1)	(4)	(6)	(10)
Net expected loss to be paid (recovered), end of period	44	43	44	43	44
Structured finance
Present Value of Net Expected Loss and Loss Adjustment Expenses to be Paid [Roll Forward]
Net expected loss to be paid (recovered), beginning of period	117	225	110	202	202
Total economic loss development (benefit)	(47)	(94)	(46)	(126)
Net (paid) recovered losses	12	(36)	18	19
Net expected loss to be paid (recovered), end of period	$ 82	$ 95	$ 82	$ 95	$ 110

Expected Loss to be Paid (Rec_6

Expected Loss to be Paid (Recovered) - Net Economic Loss Development (Benefit) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Schedule of Expected Losses to be Paid [Line Items]
RMBS losses	$ 87	$ (72)	$ 147	$ (148)
RMBS | United States
Schedule of Expected Losses to be Paid [Line Items]
RMBS losses	(48)	(95)	(52)	(127)
RMBS | United States | First Lien
Schedule of Expected Losses to be Paid [Line Items]
RMBS losses	(12)	(38)	(12)	(34)
RMBS | United States | Second Lien
Schedule of Expected Losses to be Paid [Line Items]
RMBS losses	$ (36)	$ (57)	$ (40)	$ (93)

Expected Loss to be Paid (Rec_7

Expected Loss to be Paid (Recovered) - Liquidation Rates and Key Assumptions in Base Scenario Expected Loss First Lien RMBS (Details)	Sep. 30, 2023	Dec. 31, 2022
Current but recently delinquent | Alt-A and Prime
Schedule of Expected Losses to be Paid [Line Items]
Liquidation rate	20%	20%
Current but recently delinquent | Option ARM
Schedule of Expected Losses to be Paid [Line Items]
Liquidation rate	20%	20%
Current but recently delinquent | Subprime
Schedule of Expected Losses to be Paid [Line Items]
Liquidation rate	20%	20%
30 – 59 Days Delinquent | Alt-A and Prime
Schedule of Expected Losses to be Paid [Line Items]
Liquidation rate	35%	35%
30 – 59 Days Delinquent | Option ARM
Schedule of Expected Losses to be Paid [Line Items]
Liquidation rate	35%	35%
30 – 59 Days Delinquent | Subprime
Schedule of Expected Losses to be Paid [Line Items]
Liquidation rate	30%	30%
60 – 89 Days Delinquent | Alt-A and Prime
Schedule of Expected Losses to be Paid [Line Items]
Liquidation rate	40%	40%
60 – 89 Days Delinquent | Option ARM
Schedule of Expected Losses to be Paid [Line Items]
Liquidation rate	45%	45%
60 – 89 Days Delinquent | Subprime
Schedule of Expected Losses to be Paid [Line Items]
Liquidation rate	40%	40%
90+ Days Delinquent | Alt-A and Prime
Schedule of Expected Losses to be Paid [Line Items]
Liquidation rate	55%	55%
90+ Days Delinquent | Option ARM
Schedule of Expected Losses to be Paid [Line Items]
Liquidation rate	60%	60%
90+ Days Delinquent | Subprime
Schedule of Expected Losses to be Paid [Line Items]
Liquidation rate	45%	45%
Bankruptcy | Alt-A and Prime
Schedule of Expected Losses to be Paid [Line Items]
Liquidation rate	45%	45%
Bankruptcy | Option ARM
Schedule of Expected Losses to be Paid [Line Items]
Liquidation rate	50%	50%
Bankruptcy | Subprime
Schedule of Expected Losses to be Paid [Line Items]
Liquidation rate	40%	40%
Foreclosure | Alt-A and Prime
Schedule of Expected Losses to be Paid [Line Items]
Liquidation rate	60%	60%
Foreclosure | Option ARM
Schedule of Expected Losses to be Paid [Line Items]
Liquidation rate	65%	65%
Foreclosure | Subprime
Schedule of Expected Losses to be Paid [Line Items]
Liquidation rate	55%	55%
Real Estate Owned
Schedule of Expected Losses to be Paid [Line Items]
Liquidation rate	100%	100%

Expected Loss to be Paid (Rec_8

Expected Loss to be Paid (Recovered) - Key Assumptions in Base Scenario Expected Loss Second Lien RMBS (Details) - RMBS - United States	Sep. 30, 2023	Dec. 31, 2022
Home Equity Line of Credit
Schedule of Expected Losses to be Paid [Line Items]
Loss severity	98%	98%
Projected future recoveries on previously charged-off loans	40%	30%
Home Equity Line of Credit | Minimum
Schedule of Expected Losses to be Paid [Line Items]
Plateau CDR	0.40%	0.40%
Final CDR trended down to	0%	0%
Home Equity Line of Credit | Maximum
Schedule of Expected Losses to be Paid [Line Items]
Plateau CDR	8.70%	8.40%
Final CDR trended down to	0.40%	0.40%
Home Equity Line of Credit | Weighted Average
Schedule of Expected Losses to be Paid [Line Items]
Plateau CDR	2.70%	3.50%
Final CDR trended down to	0.10%	0.20%
Alt-A and Prime | 2007+
Schedule of Expected Losses to be Paid [Line Items]
Loss severity	50%	50%
Alt-A and Prime | 2005 and prior
Schedule of Expected Losses to be Paid [Line Items]
Loss severity	50%	50%
Alt-A and Prime | 2006
Schedule of Expected Losses to be Paid [Line Items]
Loss severity	50%	50%
Alt-A and Prime | Minimum
Schedule of Expected Losses to be Paid [Line Items]
Plateau CDR	0.30%	1.60%
Final CDR trended down to	0%	0.10%
Alt-A and Prime | Maximum
Schedule of Expected Losses to be Paid [Line Items]
Plateau CDR	9.70%	11.50%
Final CDR trended down to	0.50%	0.60%
Alt-A and Prime | Weighted Average
Schedule of Expected Losses to be Paid [Line Items]
Plateau CDR	3.80%	5.10%
Final CDR trended down to	0.20%	0.30%
Option ARM | 2007+
Schedule of Expected Losses to be Paid [Line Items]
Loss severity	50%	50%
Option ARM | 2005 and prior
Schedule of Expected Losses to be Paid [Line Items]
Loss severity	50%	50%
Option ARM | 2006
Schedule of Expected Losses to be Paid [Line Items]
Loss severity	50%	50%
Option ARM | Minimum
Schedule of Expected Losses to be Paid [Line Items]
Plateau CDR	0%	2%
Final CDR trended down to	0%	0.10%
Option ARM | Maximum
Schedule of Expected Losses to be Paid [Line Items]
Plateau CDR	9.20%	7.70%
Final CDR trended down to	0.50%	0.40%
Option ARM | Weighted Average
Schedule of Expected Losses to be Paid [Line Items]
Plateau CDR	3.60%	4.30%
Final CDR trended down to	0.20%	0.20%
Subprime | 2007+
Schedule of Expected Losses to be Paid [Line Items]
Loss severity	50%	50%
Subprime | 2005 and prior
Schedule of Expected Losses to be Paid [Line Items]
Loss severity	50%	50%
Subprime | 2006
Schedule of Expected Losses to be Paid [Line Items]
Loss severity	50%	50%
Subprime | Minimum
Schedule of Expected Losses to be Paid [Line Items]
Plateau CDR	0.20%	2.70%
Final CDR trended down to	0%	0.10%
Subprime | Maximum
Schedule of Expected Losses to be Paid [Line Items]
Plateau CDR	9.60%	9.70%
Final CDR trended down to	0.50%	0.50%
Subprime | Weighted Average
Schedule of Expected Losses to be Paid [Line Items]
Plateau CDR	4.70%	5.60%
Final CDR trended down to	0.20%	0.30%
Current but recently delinquent | Home Equity Line of Credit
Schedule of Expected Losses to be Paid [Line Items]
Liquidation rate	20%	20%
30 – 59 Days Delinquent | Home Equity Line of Credit
Schedule of Expected Losses to be Paid [Line Items]
Liquidation rate	30%	30%
60 – 89 Days Delinquent | Home Equity Line of Credit
Schedule of Expected Losses to be Paid [Line Items]
Liquidation rate	40%	40%
90+ Days Delinquent | Home Equity Line of Credit
Schedule of Expected Losses to be Paid [Line Items]
Liquidation rate	60%	60%
Bankruptcy | Home Equity Line of Credit
Schedule of Expected Losses to be Paid [Line Items]
Liquidation rate	55%	55%
Foreclosure | Home Equity Line of Credit
Schedule of Expected Losses to be Paid [Line Items]
Liquidation rate	55%	55%
Real Estate Owned | Home Equity Line of Credit
Schedule of Expected Losses to be Paid [Line Items]
Liquidation rate	100%	100%

Contracts Accounted for as In_3

Contracts Accounted for as Insurance - Net Earned Premiums (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Guarantor Obligations [Line Items]
Scheduled net earned premiums	$ 73	$ 70	$ 212	$ 219
Accelerations from refundings and terminations	14	12	26	145
Accretion of discount on net premiums receivable	7	6	20	18
Financial guaranty insurance net earned premiums	94	88	258	382
Specialty net earned premiums	1	1	3	3
Net earned premiums	$ 95	$ 89	$ 261	385
Financial Guarantee Insurance And Other Product Line
Guarantor Obligations [Line Items]
Accelerations from refundings and terminations				$ 104

Contracts Accounted for as In_4

Contracts Accounted for as Insurance - Gross Premium Receivable Net of Commissions on Assumed Business Roll Forward (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022
Gross Premium Receivable Net of Ceding Commissions [Roll Forward]
Beginning of year	$ 1,298	$ 1,372
Less: Specialty insurance premium receivable	1	1
Financial guaranty insurance premiums receivable	1,297	1,371
Gross written premiums on new business, net of commissions	215	232
Gross premiums received, net of commissions	(170)	(258)
Adjustments:
Changes in the expected term and debt service assumptions	4	(5)
Accretion of discount, net of commissions on assumed business	20	18
Foreign exchange gain (loss) on remeasurement	9	(181)
FG insurance premiums receivable	1,375	1,177
Specialty insurance premium receivable	1	1
Ending balance	$ 1,376	$ 1,178

Contracts Accounted for as In_5

Contracts Accounted for as Insurance - Narrative (Details)	9 Months Ended	12 Months Ended
	Sep. 30, 2023	Dec. 31, 2022
Guarantor Obligations [Line Items]
Weighted average risk-free rates for U.S. dollar denominated financial guaranty insurance obligations	4.86%	4.15%
Minimum
Guarantor Obligations [Line Items]
Weighted average risk-free rates for U.S. dollar denominated financial guaranty insurance obligations	4.51%	3.82%
Maximum
Guarantor Obligations [Line Items]
Weighted average risk-free rates for U.S. dollar denominated financial guaranty insurance obligations	5.45%	4.69%
Foreign Currency Concentration Risk | Premiums Receivable | Premiums Receivable
Guarantor Obligations [Line Items]
Percentage of installment premiums denominated in currencies other than the U.S. dollar	70%	74%

Contracts Accounted for as In_6

Contracts Accounted for as Insurance - Expected Future Premium Collections and Earnings (Details) $ in Millions	Sep. 30, 2023 USD ($)
Consolidated Entity Excluding Variable Interest Entities (VIE)
Future Premiums to be Collected [Abstract]
2023 (October 1 - December 31)	$ 45
2024	134
2025	104
2026	100
2027	97
2028-2032	402
2033-2037	264
2038-2042	182
After 2042	360
Total	1,688
Financial Guarantee Insurance Product Line
Future Net Premiums to be Earned [Abstract]
2023 (October 1 - December 31)	72
2024	277
2025	259
2026	243
2027	230
2028-2032	958
2033-2037	635
2038-2042	390
After 2042	537
Total	3,601
Future accretion	313
Total future net earned premiums	$ 3,914

Contracts Accounted for as In_7

Contracts Accounted for as Insurance - Selected Information for Policies Paid In Installments (Details) - USD ($) $ in Millions	9 Months Ended	12 Months Ended
	Sep. 30, 2023	Dec. 31, 2022	Sep. 30, 2022	Dec. 31, 2021
Financial Guarantee Insurance Premiums [Line Items]
Premiums receivable, net of commissions payable	$ 1,376	$ 1,298	$ 1,178	$ 1,372
Financial Guarantee Policies Paid in Installments
Financial Guarantee Insurance Premiums [Line Items]
Premiums receivable, net of commissions payable	1,375	1,297
Deferred premium revenue	$ 1,702	$ 1,663
Weighted-average risk-free rate used to discount premiums	1.90%	1.80%
Weighted-average period of premiums receivable (in years)	12 years 2 months 12 days	12 years 10 months 24 days

Contracts Accounted for as In_8

Contracts Accounted for as Insurance - Loss and LAE Reserve and Salvage and Subrogation Recoverable Net of Reinsurance (Details) - USD ($) $ in Millions	Sep. 30, 2023	Dec. 31, 2022
Liability for Claims and Claims Adjustment Expense Including Salvage and Subrogation Recoverable [Line Items]
Net Reserve (Recoverable)	$ 77	$ 37
Public finance | Financial Guarantee Insurance And Other Product Line
Liability for Claims and Claims Adjustment Expense Including Salvage and Subrogation Recoverable [Line Items]
Net Reserve (Recoverable)	124	72
Other structured finance | Financial Guarantee Insurance And Other Product Line
Liability for Claims and Claims Adjustment Expense Including Salvage and Subrogation Recoverable [Line Items]
Net Reserve (Recoverable)	42	42
Structured finance | Financial Guarantee Insurance And Other Product Line
Liability for Claims and Claims Adjustment Expense Including Salvage and Subrogation Recoverable [Line Items]
Net Reserve (Recoverable)	(47)	(35)
United States | Public finance | Financial Guarantee Insurance And Other Product Line
Liability for Claims and Claims Adjustment Expense Including Salvage and Subrogation Recoverable [Line Items]
Net Reserve (Recoverable)	123	71
United States | RMBS | Financial Guarantee Insurance And Other Product Line
Liability for Claims and Claims Adjustment Expense Including Salvage and Subrogation Recoverable [Line Items]
Net Reserve (Recoverable)	(89)	(77)
Non United States | Public finance | Financial Guarantee Insurance And Other Product Line
Liability for Claims and Claims Adjustment Expense Including Salvage and Subrogation Recoverable [Line Items]
Net Reserve (Recoverable)	$ 1	$ 1

Contracts Accounted for as In_9

Contracts Accounted for as Insurance - Reconciliation of Net Expected Loss to be Paid and Expensed (Details) - USD ($) $ in Millions	Sep. 30, 2023	Jun. 30, 2023	Dec. 31, 2022	Sep. 30, 2022	Jun. 30, 2022	Dec. 31, 2021
Guarantor Obligations [Line Items]
Net expected loss to be paid (recovered) - financial guaranty insurance	$ 490	$ 560	$ 522	$ 727	$ 442	$ 411
Net expected loss to be expensed	196
Financial Guarantee Insurance And Other Product Line
Guarantor Obligations [Line Items]
Net expected loss to be paid (recovered) - financial guaranty insurance	249
Contra-paid, net	21
Salvage and subrogation recoverable, net	281
Loss and LAE reserve - financial guaranty insurance contracts, net of reinsurance	(355)
Net expected loss to be expensed	$ 196

Contracts Accounted for as I_10

Contracts Accounted for as Insurance - Net Expected Loss to be Expensed Insurance Contracts (Details) $ in Millions	Sep. 30, 2023 USD ($)
Insurance [Abstract]
2023 (October 1 - December 31)	$ 2
2024	13
2025	12
2026	15
2027	16
2028-2032	63
2033-2037	49
2038-2042	13
After 2042	13
Net expected loss to be expensed	196
Future accretion	39
Total expected future loss and LAE	$ 235

Contracts Accounted for as I_11

Contracts Accounted for as Insurance - Loss and LAE Reported on the Statements of Operations (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Liability for Claims and Claims Adjustment Expense Including Salvage and Subrogation Recoverable [Line Items]
Loss and loss adjustment expenses (benefit)	$ 100	$ (75)	$ 159	$ (29)
Public finance | Financial Guarantee Insurance And Other Product Line
Liability for Claims and Claims Adjustment Expense Including Salvage and Subrogation Recoverable [Line Items]
Loss and loss adjustment expenses (benefit)	134	1	186	67
Public finance | Financial Guarantee Insurance And Other Product Line | United States
Liability for Claims and Claims Adjustment Expense Including Salvage and Subrogation Recoverable [Line Items]
Loss and loss adjustment expenses (benefit)	134	1	186	67
Public finance | Financial Guarantee Insurance And Other Product Line | Non United States
Liability for Claims and Claims Adjustment Expense Including Salvage and Subrogation Recoverable [Line Items]
Loss and loss adjustment expenses (benefit)	0	0	0	0
RMBS | Financial Guarantee Insurance And Other Product Line | United States
Liability for Claims and Claims Adjustment Expense Including Salvage and Subrogation Recoverable [Line Items]
Loss and loss adjustment expenses (benefit)	(35)	(78)	(31)	(97)
Other structured finance | Financial Guarantee Insurance And Other Product Line
Liability for Claims and Claims Adjustment Expense Including Salvage and Subrogation Recoverable [Line Items]
Loss and loss adjustment expenses (benefit)	1	2	4	1
Structured finance | Financial Guarantee Insurance And Other Product Line
Liability for Claims and Claims Adjustment Expense Including Salvage and Subrogation Recoverable [Line Items]
Loss and loss adjustment expenses (benefit)	$ (34)	$ (76)	$ (27)	$ (96)

Contracts Accounted for as I_12

Contracts Accounted for as Insurance - BIG Transaction Loss Summary (Details) $ in Millions	9 Months Ended	12 Months Ended
	Sep. 30, 2023 USD ($) risk	Dec. 31, 2022 USD ($) risk
Discount
Total	$ (39)
BIG
Number of risks
Total (in contracts) | risk	224	247
Principal
Total	$ 5,119	$ 5,835
BIG | BIG 1
Number of risks
Total (in contracts) | risk	102	122
Principal
Total	$ 2,115	$ 3,357
BIG | BIG 2
Number of risks
Total (in contracts) | risk	13	14
Principal
Total	$ 980	$ 171
BIG | BIG 3
Number of risks
Total (in contracts) | risk	109	111
Principal
Total	$ 2,024	$ 2,307
BIG | Consolidated Entity Excluding Variable Interest Entities (VIE)
Number of risks
Total (in contracts) | risk	224	247
Remaining weighted average contract period
Gross (in years)	10 years 2 months 12 days	9 years 9 months 18 days
Total (in years)	10 years 2 months 12 days	9 years 9 months 18 days
Principal
Gross	$ 5,134	$ 5,852
Total	5,119	5,835
Interest
Gross	2,871	3,148
Total	2,867	3,144
Total net outstanding exposure
Gross	8,005	9,000
Total	7,986	8,979
Expected cash outflows (inflows)
Gross	1,914	2,020
Total	1,903	2,008
Potential recoveries
Gross	(1,625)	(1,737)
Total	(1,615)	(1,725)
Subtotal
Gross	289	283
Total	288	283
Discount
Gross	(39)	(82)
Total	(39)	(82)
Expected losses to be paid (recovered)
Gross	250	201
Net expected loss to be paid	249	201
Deferred premium revenue
Gross	306	345
Total	306	345
Reserves (salvage)
Gross	74	33
Total	$ 74	$ 33
BIG | Consolidated Entity Excluding Variable Interest Entities (VIE) | BIG 1
Number of risks
Total (in contracts) | risk	102	122
Remaining weighted average contract period
Gross (in years)	9 years 9 months 18 days	11 years 3 months 18 days
Principal
Gross	$ 2,121	$ 3,363
Interest
Gross	1,125	2,177
Total net outstanding exposure
Gross	3,246	5,540
Expected cash outflows (inflows)
Gross	113	128
Potential recoveries
Gross	(324)	(294)
Subtotal
Gross	(211)	(166)
Discount
Gross	60	35
Expected losses to be paid (recovered)
Gross	(151)	(131)
Deferred premium revenue
Gross	96	170
Reserves (salvage)
Gross	$ (178)	$ (174)
BIG | Consolidated Entity Excluding Variable Interest Entities (VIE) | BIG 2
Number of risks
Total (in contracts) | risk	13	14
Remaining weighted average contract period
Gross (in years)	16 years 1 month 6 days	8 years 8 months 12 days
Principal
Gross	$ 980	$ 171
Interest
Gross	922	77
Total net outstanding exposure
Gross	1,902	248
Expected cash outflows (inflows)
Gross	180	121
Potential recoveries
Gross	(78)	(79)
Subtotal
Gross	102	42
Discount
Gross	(25)	(13)
Expected losses to be paid (recovered)
Gross	77	29
Deferred premium revenue
Gross	64	15
Reserves (salvage)
Gross	$ 37	$ 21
BIG | Consolidated Entity Excluding Variable Interest Entities (VIE) | BIG 3
Number of risks
Total (in contracts) | risk	109	111
Remaining weighted average contract period
Gross (in years)	7 years 8 months 12 days	7 years 7 months 6 days
Principal
Gross	$ 2,033	$ 2,318
Interest
Gross	824	894
Total net outstanding exposure
Gross	2,857	3,212
Expected cash outflows (inflows)
Gross	1,621	1,771
Potential recoveries
Gross	(1,223)	(1,364)
Subtotal
Gross	398	407
Discount
Gross	(74)	(104)
Expected losses to be paid (recovered)
Gross	324	303
Deferred premium revenue
Gross	146	160
Reserves (salvage)
Gross	$ 215	$ 186

Contracts Accounted for as Cr_3

Contracts Accounted for as Credit Derivatives - Credit Derivatives Subordination and Ratings (Details) - USD ($) $ in Millions	9 Months Ended	12 Months Ended
	Sep. 30, 2023	Dec. 31, 2022
Credit Derivatives
Estimated remaining weighted average life of credit derivatives (in years)	11 years 4 months 24 days	12 years 9 months 18 days
Net Par Outstanding on Credit Derivatives
Net Par Outstanding	$ 3,489	$ 3,203
Net Fair Value Asset (Liability)	(49)	(162)
Expected loss to be recovered	3	3
Public finance | United States
Net Par Outstanding on Credit Derivatives
Net Par Outstanding	1,074	1,175
Net Fair Value Asset (Liability)	(15)	(79)
Public finance | Non United States
Net Par Outstanding on Credit Derivatives
Net Par Outstanding	1,478	1,565
Net Fair Value Asset (Liability)	(19)	(58)
Structured finance | United States
Net Par Outstanding on Credit Derivatives
Net Par Outstanding	327	342
Net Fair Value Asset (Liability)	(13)	(22)
Structured finance | Non United States
Net Par Outstanding on Credit Derivatives
Net Par Outstanding	610	121
Net Fair Value Asset (Liability)	$ (2)	$ (3)

Contracts Accounted for as Cr_4

Contracts Accounted for as Credit Derivatives - Distribution of Credit Derivative Net Par Outstanding by Internal Rating (Details) - USD ($) $ in Millions	9 Months Ended	12 Months Ended
	Sep. 30, 2023	Dec. 31, 2022
Credit Derivatives
Net Par Outstanding	$ 3,489	$ 3,203
BIG
Credit Derivatives
Net Par Outstanding	55	57
Credit Concentration Risk | Derivative, Aggregate Notional Amount
Credit Derivatives
Net Par Outstanding	$ 3,489	$ 3,203
Percentage of installment premiums denominated in currencies other than the U.S. dollar	100%	100%
Credit Concentration Risk | Derivative, Aggregate Notional Amount | AAA
Credit Derivatives
Net Par Outstanding	$ 1,255	$ 1,260
Percentage of installment premiums denominated in currencies other than the U.S. dollar	36%	39.30%
Credit Concentration Risk | Derivative, Aggregate Notional Amount | AA
Credit Derivatives
Net Par Outstanding	$ 1,020	$ 1,064
Percentage of installment premiums denominated in currencies other than the U.S. dollar	29.20%	33.20%
Credit Concentration Risk | Derivative, Aggregate Notional Amount | A
Credit Derivatives
Net Par Outstanding	$ 689	$ 232
Percentage of installment premiums denominated in currencies other than the U.S. dollar	19.70%	7.20%
Credit Concentration Risk | Derivative, Aggregate Notional Amount | BBB
Credit Derivatives
Net Par Outstanding	$ 470	$ 590
Percentage of installment premiums denominated in currencies other than the U.S. dollar	13.50%	18.50%
Credit Concentration Risk | Derivative, Aggregate Notional Amount | BIG
Credit Derivatives
Net Par Outstanding	$ 55	$ 57
Percentage of installment premiums denominated in currencies other than the U.S. dollar	1.60%	1.80%

Contracts Accounted for as Cr_5

Contracts Accounted for as Credit Derivatives - Net Change in Fair Value of Credit Derivatives Gains (Losses) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Realized gains (losses) and other settlements	$ 0	$ (1)	$ 1	$ (2)
Net unrealized gains (losses)	9	(47)	114	(40)
Fair value gains (losses) on credit derivatives	$ 9	$ (48)	$ 115	$ (42)

Contracts Accounted for as Cr_6

Contracts Accounted for as Credit Derivatives - CDS Spread and Components of Credit Derivative Assets (Liabilities) (Details) - USD ($) $ in Millions	Sep. 30, 2023	Dec. 31, 2022	Sep. 30, 2022	Dec. 31, 2021
Credit Derivatives
Fair value of credit derivatives before effect of AGC credit spread	$ (80)	$ (207)
Plus: Effect of AGC credit spread	31	45
Net fair value of credit derivatives	$ (49)	$ (162)
Five-year CDS spread | AGC
Credit Derivatives
Quoted price of CDS contract (as a percent)	0.98%	0.63%	0.70%	0.49%
One-year CDS spread | AGC
Credit Derivatives
Quoted price of CDS contract (as a percent)	0.41%	0.26%	0.28%	0.16%

Investments - Additional Inform

Investments - Additional Information (Details) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023 USD ($) Security	Sep. 30, 2022 USD ($)	Sep. 30, 2023 USD ($) fund Security manager	Sep. 30, 2022 USD ($)	Dec. 31, 2022 USD ($) Security
Schedule of Investments [Line Items]
Number of outside managers managing investment portfolio | manager			3
Funds accounted for as CIVs | fund			3
Total number of investments | fund			6
Accrued investment income	$ 78		$ 78		$ 71
Number of securities with unrealized losses greater than 10% of book value for 12 months or more | Security	641		641		567
Total unrealized losses for securities having losses greater than 10% of book value for 12 months or more	$ 351		$ 351		$ 329
Assets held-in-trust	224		224		222
Allowance for credit loss	(8)	$ (4)	(23)	$ (13)
Sales	73	207	767	$ 560
Securities purchased with credit deterioration	0	22	0
Securities purchased with credit deterioration, amount at par value		31
Allowance for credit loss at acquisition date		2
Discount attributable to other factors		$ 7
Disposal Group, Held-for-sale, Not Discontinued Operations | Sound Point Agreement
Schedule of Investments [Line Items]
Transaction commitment, new and transitioned investments	1,000
AGL Subsidiaries
Schedule of Investments [Line Items]
Assets held-in-trust	1,107		1,107		$ 1,169
Future Equity Investments | Alternative Investment
Schedule of Investments [Line Items]
Investments, including distributed gains, authorized amount to invest	132		132
Investments, authorized amount to invest	1,500		1,500
Investments, fair value disclosure	630		630
Unfunded committment	890		890
Unfunded committment, committed for specific funds	332		332
Future Equity Investments | AGL Subsidiaries | Alternative Investment
Schedule of Investments [Line Items]
Investments, authorized amount to invest	882		882
Authorized amount to invest, excluding distributed gains	750		750
Equity in Earnings (Losses) of Investees | AGAS | Alternative Investment
Schedule of Investments [Line Items]
Investments, fair value disclosure	469		469
Long-term purchase commitment, amount			703
Funded amount	$ 446		$ 446

Investments - Internally Manage

Investments - Internally Managed Investment Portfolio (Details) - USD ($) $ in Millions	Sep. 30, 2023	Aug. 31, 2023	Dec. 31, 2022
Debt and Equity Securities, FV-NI [Line Items]
Estimated fair value	$ 6,267		$ 7,119
Fixed-maturity securities, trading	350		303
Short-term investments, at fair value	1,426		810
Other invested assets	765		133
Total investments	8,808		8,365
Externally managed
Debt and Equity Securities, FV-NI [Line Items]
Estimated fair value	5,316		5,824
Externally managed | Internal
Debt and Equity Securities, FV-NI [Line Items]
Estimated fair value	294		305
Loss Mitigation Securities
Debt and Equity Securities, FV-NI [Line Items]
Estimated fair value	495		548
Puerto Rico, New Recovery Bonds
Debt and Equity Securities, FV-NI [Line Items]
Estimated fair value	78		358
Puerto Rico, New Recovery Bonds | AGC And AGM
Debt and Equity Securities, FV-NI [Line Items]
Recovery bonds transferred		$ 68
Other
Debt and Equity Securities, FV-NI [Line Items]
Estimated fair value	378		389
Other | Assured IM
Debt and Equity Securities, FV-NI [Line Items]
Estimated fair value	$ 214		$ 232
Contingent Value Instruments | AGC And AGM
Debt and Equity Securities, FV-NI [Line Items]
Recovery bonds transferred		$ 5
BIG
Debt and Equity Securities, FV-NI [Line Items]
Fixed-maturity investments, non-investment grade, percent	7.60%		7.40%
Not Internally Rated
Debt and Equity Securities, FV-NI [Line Items]
Fixed-maturity investments, non-investment grade, percent	2.40%		5.90%
Sound Point Capital Management, LP [Member]
Debt and Equity Securities, FV-NI [Line Items]
Other invested assets	$ 419		$ 0
Equity method investments
Debt and Equity Securities, FV-NI [Line Items]
Other invested assets	331		123
Other
Debt and Equity Securities, FV-NI [Line Items]
Other invested assets	$ 15		$ 10

Investments - Fixed Maturity Se

Investments - Fixed Maturity Securities and Short Term Investments (Details) - USD ($) $ in Millions	Sep. 30, 2023	Jun. 30, 2023	Dec. 31, 2022	Sep. 30, 2022	Jun. 30, 2022	Dec. 31, 2021
Schedule of Investments [Line Items]
Percent of Total	100%		100%
Amortized Cost	$ 6,971		$ 7,707
Allowance for Credit Losses	(86)	$ (79)	(65)	$ (57)	$ (51)	$ (42)
Gross Unrealized Gains	30		65
Gross Unrealized Losses	(648)		(588)
Estimated Fair Value	$ 6,267		$ 7,119
Government agency obligations as a percentage of total mortgage backed securities	38%		30%
Obligations of state and political subdivisions
Schedule of Investments [Line Items]
Percent of Total	42%		45%
Amortized Cost	$ 2,938		$ 3,509
Allowance for Credit Losses	(14)		(14)
Gross Unrealized Gains	20		37
Gross Unrealized Losses	(178)		(138)
Estimated Fair Value	$ 2,766		$ 3,394
U.S. government and agencies
Schedule of Investments [Line Items]
Percent of Total	1%		2%
Amortized Cost	$ 65		$ 118
Allowance for Credit Losses	0		0
Gross Unrealized Gains	0		1
Gross Unrealized Losses	(7)		(8)
Estimated Fair Value	$ 58		$ 111
Corporate securities
Schedule of Investments [Line Items]
Percent of Total	33%		31%
Amortized Cost	$ 2,321		$ 2,387
Allowance for Credit Losses	(6)		(6)
Gross Unrealized Gains	1		2
Gross Unrealized Losses	(307)		(299)
Estimated Fair Value	$ 2,009		$ 2,084
RMBS
Schedule of Investments [Line Items]
Percent of Total	6%		5%
Amortized Cost	$ 430		$ 418
Allowance for Credit Losses	(20)		(19)
Gross Unrealized Gains	2		3
Gross Unrealized Losses	(82)		(62)
Estimated Fair Value	$ 330		$ 340
CMBS
Schedule of Investments [Line Items]
Percent of Total	3%		4%
Amortized Cost	$ 198		$ 282
Allowance for Credit Losses	0		0
Gross Unrealized Gains	0		0
Gross Unrealized Losses	(10)		(11)
Estimated Fair Value	$ 188		$ 271
CLOs
Schedule of Investments [Line Items]
Percent of Total	7%		6%
Amortized Cost	$ 463		$ 449
Allowance for Credit Losses	0		0
Gross Unrealized Gains	1		0
Gross Unrealized Losses	(10)		(21)
Estimated Fair Value	$ 454		$ 428
Others
Schedule of Investments [Line Items]
Percent of Total	6%		5%
Amortized Cost	$ 440		$ 423
Allowance for Credit Losses	(46)		(26)
Gross Unrealized Gains	6		22
Gross Unrealized Losses	(31)		(26)
Estimated Fair Value	$ 369		$ 393
Non-U.S. government securities
Schedule of Investments [Line Items]
Percent of Total	2%		2%
Amortized Cost	$ 116		$ 121
Allowance for Credit Losses	0		0
Gross Unrealized Gains	0		0
Gross Unrealized Losses	(23)		(23)
Estimated Fair Value	$ 93		$ 98

Investments - Gross Unrealized

Investments - Gross Unrealized Loss by Length of Time (Details) $ in Millions	Sep. 30, 2023 USD ($) Security	Dec. 31, 2022 USD ($) Security
Less than 12 months
Fair Value	$ 2,093	$ 3,751
Gross Unrealized Loss	$ (58)	$ (213)
Number of securities | Security	795	1,340
12 months or more
Fair Value	$ 3,150	$ 1,017
Gross Unrealized Loss	$ (436)	$ (239)
Number of securities | Security	1,308	466
Total
Fair Value	$ 5,243	$ 4,768
Gross Unrealized Loss	$ (494)	$ (452)
Number of securities | Security	2,079	1,776
Obligations of state and political subdivisions
Less than 12 months
Fair Value	$ 1,610	$ 1,763
Gross Unrealized Loss	(39)	(79)
12 months or more
Fair Value	899	163
Gross Unrealized Loss	(136)	(56)
Total
Fair Value	2,509	1,926
Gross Unrealized Loss	(175)	(135)
U.S. government and agencies
Less than 12 months
Fair Value	21	32
Gross Unrealized Loss	0	0
12 months or more
Fair Value	32	52
Gross Unrealized Loss	(7)	(8)
Total
Fair Value	53	84
Gross Unrealized Loss	(7)	(8)
Corporate securities
Less than 12 months
Fair Value	381	1,276
Gross Unrealized Loss	(14)	(95)
12 months or more
Fair Value	1,396	519
Gross Unrealized Loss	(236)	(147)
Total
Fair Value	1,777	1,795
Gross Unrealized Loss	(250)	(242)
RMBS
Less than 12 months
Fair Value	55	147
Gross Unrealized Loss	(3)	(9)
12 months or more
Fair Value	122	3
Gross Unrealized Loss	(14)	(1)
Total
Fair Value	177	150
Gross Unrealized Loss	(17)	(10)
CMBS
Less than 12 months
Fair Value	3	270
Gross Unrealized Loss	0	(11)
12 months or more
Fair Value	184	0
Gross Unrealized Loss	(10)	0
Total
Fair Value	187	270
Gross Unrealized Loss	(10)	(11)
CLOs
Less than 12 months
Fair Value	18	171
Gross Unrealized Loss	(2)	(7)
12 months or more
Fair Value	402	250
Gross Unrealized Loss	(8)	(14)
Total
Fair Value	420	421
Gross Unrealized Loss	(10)	(21)
Other
Less than 12 months
Fair Value	1	27
Gross Unrealized Loss	0	(2)
12 months or more
Fair Value	26	0
Gross Unrealized Loss	(2)	0
Total
Fair Value	27	27
Gross Unrealized Loss	(2)	(2)
Non-U.S. government securities
Less than 12 months
Fair Value	4	65
Gross Unrealized Loss	0	(10)
12 months or more
Fair Value	89	30
Gross Unrealized Loss	(23)	(13)
Total
Fair Value	93	95
Gross Unrealized Loss	$ (23)	$ (23)

Investments - Distribution of F

Investments - Distribution of Fixed-Maturity Securities by Contractual Maturity (Details) - USD ($) $ in Millions	Sep. 30, 2023	Dec. 31, 2022
Amortized Cost
Due within one year	$ 248
Due after one year through five years	1,526
Due after five years through 10 years	1,760
Due after 10 years	2,809
Amortized Cost	6,971	$ 7,707
Estimated Fair Value
Due within one year	239
Due after one year through five years	1,406
Due after five years through 10 years	1,629
Due after 10 years	2,475
Estimated Fair Value	6,267	7,119
RMBS
Amortized Cost
Amortized Cost	430	418
Estimated Fair Value
Estimated Fair Value	330	340
CMBS
Amortized Cost
Amortized Cost	198	282
Estimated Fair Value
Estimated Fair Value	$ 188	$ 271

Investments - Net Investment In

Investments - Net Investment Income and Equity in Earnings of Investees (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Net Investment Income
Gross investment income	$ 102	$ 68	$ 274	$ 195
Investment expenses	(2)	(1)	(4)	(4)
Net investment income	100	67	270	191
Fair value gains (losses) on trading securities	4	(8)	42	(30)
Equity in Earnings (Losses) of Investees	18	(20)	25	(31)
Fair value loss on trading securities still held	4	2	42	18
Externally managed
Net Investment Income
Gross investment income	51	50	156	150
Loss Mitigation Securities
Net Investment Income
Gross investment income	24	9	46	24
Puerto Rico, New Recovery Bonds
Net Investment Income
Gross investment income	1	1	5	5
Other
Net Investment Income
Gross investment income	5	4	12	11
Short-term investments
Net Investment Income
Gross investment income	21	4	53	5
Other
Net Investment Income
Gross investment income	$ 0	$ 0	$ 2	$ 0

Investments - Net Realized Inve

Investments - Net Realized Investment Gains (Losses) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Investments, Debt and Equity Securities [Abstract]
Gross realized gains on sales of available-for-sale securities	$ 2	$ 0	$ 21	$ 0
Gross realized losses on sales available-for-sale securities	(1)	(10)	(16)	(33)
Net foreign currency gains (losses)	(1)	0	(1)	(3)
Change in allowance for credit losses and intent to sell	(8)	(4)	(23)	(13)
Other net realized gains (losses)	(1)	0	(1)	10
Net realized investment gains (losses)	$ (9)	$ (14)	$ (20)	$ (39)

Investments - Roll Forward of C

Investments - Roll Forward of Credit Losses in the Investment Portfolio (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Roll Forward of Credit Losses in the Investment Portfolio
Balance, beginning of period	$ 79	$ 51	$ 65	$ 42
Additions for securities for which credit losses were not previously recognized	0	1	0	4
Additions for purchases of securities accounted for as purchased financial assets with credit deterioration	0	2	0	2
Additions (reductions) for securities for which credit losses were previously recognized	7	3	21	9
Balance, end of period	$ 86	$ 57	$ 86	$ 57

Financial Guaranty Variable I_3

Financial Guaranty Variable Interest Entities and Consolidated Investment Vehicles - New Recovery Bonds (Details) - USD ($) $ in Millions	Sep. 30, 2023	Aug. 31, 2023	Dec. 31, 2022
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 6,971		$ 7,707
Gross Unrealized Gains	30		65
Gross unrealized loss	(648)		(588)
Estimated Fair Value	6,267		7,119
Variable Interest Entity, Primary Beneficiary | Financial Guaranty Variable Interest Entities | Puerto Rico Trusts
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	136		204
Gross Unrealized Gains	10		4
Gross unrealized loss	0		(4)
Estimated Fair Value	$ 146	$ 73	$ 204

Financial Guaranty Variable I_4

Financial Guaranty Variable Interest Entities and Consolidated Investment Vehicles - Additional Information (Details)		3 Months Ended		9 Months Ended
	Jul. 01, 2023 rISK	Sep. 30, 2023 USD ($) policy Entity Security entity consolidatedInvestmentVehicle	Sep. 30, 2022 USD ($)	Sep. 30, 2023 USD ($) policy Entity Security entity consolidatedInvestmentVehicle	Sep. 30, 2022 USD ($)	Aug. 31, 2023 USD ($)	Dec. 31, 2022 USD ($) consolidatedInvestmentVehicle Security policy Entity entity
Variable Interest Entity [Line Items]
Estimated Fair Value		$ 6,267,000,000		$ 6,267,000,000			$ 7,119,000,000
Amortized Cost		6,971,000,000		6,971,000,000			7,707,000,000
Fixed-maturity securities, trading		350,000,000		350,000,000			303,000,000
Gross Unrealized Gains		30,000,000		30,000,000			65,000,000
Gross unrealized losses		$ 648,000,000		$ 648,000,000			$ 588,000,000
Number of securities | Security		1,308		1,308			466
Fair Value		$ 3,150,000,000		$ 3,150,000,000			$ 1,017,000,000
Number of securities | Security		795		795			1,340
Fair Value		$ 2,093,000,000		$ 2,093,000,000			$ 3,751,000,000
Fair value gains (losses) on credit derivatives		9,000,000	$ (48,000,000)	115,000,000	$ (42,000,000)
Other consolidated VIE assets		87,000,000		87,000,000			86,000,000
Other consolidated VIE liabilities		$ 7,000,000		$ 7,000,000			$ 12,000,000
Number of policies monitored | policy		15,000		15,000
Number of policies monitored, not within the scope of ASC 810 | policy		14,000		14,000
Number of policies that contain provisions for consolidation | policy		66		66			85
Net fair value gains and losses on FG VIEs are expected to reverse to zero at maturity of the VIE debt		$ 251,000,000		$ 251,000,000
Net		241,833,000,000		241,833,000,000		$ 108,000,000	$ 233,258,000,000
Carrying value of investments not consolidated		239,000,000		239,000,000
Other assets		12,000,000		12,000,000
Sound Point Agreement
Variable Interest Entity [Line Items]
Deconsolidated assets		4,700,000,000		4,700,000,000
Deconsolidated liabilities		4,400,000,000		4,400,000,000
Loss on deconsolidation		16,000,000		16,000,000
Financial Guaranty Variable Interest Entities | Variable Interest Entity, Primary Beneficiary
Variable Interest Entity [Line Items]
Maximum loss exposure		0		0
Gain (loss) in the instrument specific credit risk of the VIEs' assets		$ 3,000,000	$ 15,000,000	$ 1,000,000	11,000,000
Financial Guaranty Variable Interest Entities | Variable Interest Entity, Primary Beneficiary | Puerto Rico Trusts
Variable Interest Entity [Line Items]
Total number of entities consolidated | entity		24		24			45
Estimated Fair Value		$ 146,000,000		$ 146,000,000		$ 73,000,000	$ 204,000,000
Amortized Cost		136,000,000		136,000,000			204,000,000
Gross Unrealized Gains		10,000,000		10,000,000			4,000,000
Gross unrealized losses		$ 0		$ 0			$ 4,000,000
Number of securities | Security		0		0
Number of securities | Security							14
Fair Value							$ 110,000,000
Securities in excess of carrying value | Security							8
Unrealized losses for securities							$ 3,000,000
Financial Guaranty Variable Interest Entities | Variable Interest Entity, Primary Beneficiary | Structured Finance and Other
Variable Interest Entity [Line Items]
Total number of entities consolidated | Entity		25		25			25
Puerto Rico Trusts | Variable Interest Entity, Primary Beneficiary
Variable Interest Entity [Line Items]
Custody receipts, notice period		30 days		30 days
Consolidated Investment Vehicles
Variable Interest Entity [Line Items]
Number of remaining CIVs | rISK	3
Consolidated Investment Vehicles | Variable Interest Entity, Primary Beneficiary
Variable Interest Entity [Line Items]
Total number of entities consolidated | consolidatedInvestmentVehicle		3		3			22
Collateral posting requirement		$ 36,000,000		$ 36,000,000			$ 46,000,000
Fair value gains (losses) on credit derivatives					$ 7,000,000
Consolidated Investment Vehicles | Voting Interest Entity
Variable Interest Entity [Line Items]
Total number of entities consolidated | consolidatedInvestmentVehicle							2
Consolidated Investment Vehicles | Maximum | Future Equity Investments
Variable Interest Entity [Line Items]
Committed capital				143,000,000
Consolidated Investment Vehicles | Average | Variable Interest Entity, Primary Beneficiary
Variable Interest Entity [Line Items]
Collateral posting requirement		$ 41,000,000		$ 41,000,000			$ 47,000,000

Financial Guaranty Variable I_5

Financial Guaranty Variable Interest Entities and Consolidated Investment Vehicles - Contractual Maturity (Details) - USD ($) $ in Millions	Sep. 30, 2023	Aug. 31, 2023	Dec. 31, 2022
Estimated Fair Value
Estimated Fair Value	$ 6,267		$ 7,119
Variable Interest Entity, Primary Beneficiary | Financial Guaranty Variable Interest Entities | Puerto Rico Trusts
Amortized Cost
Due after five years through 10 years	28
Due after 10 years	108
Total	136
Estimated Fair Value
Due after five years through 10 years	30
Due after 10 years	116
Estimated Fair Value	$ 146	$ 73	$ 204

Financial Guaranty Variable I_6

Financial Guaranty Variable Interest Entities and Consolidated Investment Vehicles - Consolidated FG VIE's By Type of Collateral (Details) - USD ($) $ in Millions	Sep. 30, 2023	Dec. 31, 2022	Sep. 30, 2022
Variable Interest Entity [Line Items]
Assets	$ 11,944	$ 16,843
Liabilities	6,643	11,551
Cash	108	107	$ 131
Variable Interest Entity, Primary Beneficiary | Recourse | Financial Guaranty Variable Interest Entities
Variable Interest Entity [Line Items]
Liabilities	531	702
Variable Interest Entity, Primary Beneficiary | Nonrecourse | Financial Guaranty Variable Interest Entities
Variable Interest Entity [Line Items]
Liabilities	11	13
Variable Interest Entity, Primary Beneficiary | Puerto Rico Trusts | Recourse | Financial Guaranty Variable Interest Entities
Variable Interest Entity [Line Items]
Liabilities	347	495
Variable Interest Entity, Primary Beneficiary | Underlying, Other | Recourse | Financial Guaranty Variable Interest Entities
Variable Interest Entity [Line Items]
Liabilities	8	7
Variable Interest Entity, Primary Beneficiary | United States | RMBS | First Lien | Recourse | Financial Guaranty Variable Interest Entities
Variable Interest Entity [Line Items]
Liabilities	156	176
Variable Interest Entity, Primary Beneficiary | United States | RMBS | First Lien | Nonrecourse | Financial Guaranty Variable Interest Entities
Variable Interest Entity [Line Items]
Liabilities	11	13
Variable Interest Entity, Primary Beneficiary | United States | RMBS | Second Lien | Recourse | Financial Guaranty Variable Interest Entities
Variable Interest Entity [Line Items]
Liabilities	20	24
Financial Guaranty Variable Interest Entities | Variable Interest Entity, Primary Beneficiary
Variable Interest Entity [Line Items]
Assets	327	416
Financial Guaranty Variable Interest Entities | Variable Interest Entity, Primary Beneficiary | Puerto Rico Trusts
Variable Interest Entity [Line Items]
Assets	147	212
Total assets carried at fair value	146	209
Cash		2
Financial Guaranty Variable Interest Entities | Variable Interest Entity, Primary Beneficiary | Underlying, Other
Variable Interest Entity [Line Items]
Assets	7	7
Financial Guaranty Variable Interest Entities | Variable Interest Entity, Primary Beneficiary | United States | RMBS | First Lien
Variable Interest Entity [Line Items]
Assets	146	167
Financial Guaranty Variable Interest Entities | Variable Interest Entity, Primary Beneficiary | United States | RMBS | Second Lien
Variable Interest Entity [Line Items]
Assets	$ 27	$ 30

Financial Guaranty Variable I_7

Financial Guaranty Variable Interest Entities and Consolidated Investment Vehicles - Unpaid Principal (Details) - Variable Interest Entity, Primary Beneficiary - USD ($) $ in Millions	Sep. 30, 2023	Dec. 31, 2022
Financial Guaranty Variable Interest Entities
Variable Interest Entity [Line Items]
FG VIEs’ liabilities with recourse	$ 51	$ 21
FG VIEs’ liabilities without recourse	16	15
Unpaid principal for FG VIEs’ liabilities with recourse	582	723
Financial Guaranty Variable Interest Entities
Variable Interest Entity [Line Items]
FG VIEs’ assets	266	265
Unpaid principal balance for FG VIEs’ assets that were 90 days or more past due	$ 29	$ 34

Financial Guaranty Variable I_8

Financial Guaranty Variable Interest Entities and Consolidated Investment Vehicles - Number of Consolidated CIVs by Type (Details) - Variable Interest Entity, Primary Beneficiary - Consolidated Investment Vehicles $ in Millions	Sep. 30, 2023 consolidatedInvestmentFund consolidatedCLO cLOWarehouse consolidatedInvestmentVehicle	Dec. 31, 2022 consolidatedInvestmentVehicle consolidatedInvestmentFund consolidatedCLO cLOWarehouse	Sep. 30, 2022 USD ($)
Variable Interest Entity [Line Items]
Total number of entities consolidated | consolidatedInvestmentVehicle	3	22
Investment Managed Funds
Variable Interest Entity [Line Items]
Total number of entities consolidated | consolidatedInvestmentFund	3	8
CLOs
Variable Interest Entity [Line Items]
Total number of entities consolidated | consolidatedCLO	0	10
Deconsolidation, net assets | $			$ 417
Collateralized Loan Obligation Warehouses
Variable Interest Entity [Line Items]
Total number of entities consolidated | cLOWarehouse	0	4

Financial Guaranty Variable I_9

Financial Guaranty Variable Interest Entities and Consolidated Investment Vehicles - Schedule of Assets and Liabilities (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Sep. 30, 2023
Variable Interest Entity [Line Items]
Assets	$ 16,843	$ 11,944
Liabilities	11,551	6,643
Variable Interest Entity, Primary Beneficiary | Consolidated Investment Vehicles
Variable Interest Entity [Line Items]
Liabilities	4,625	4
Variable Interest Entity, Primary Beneficiary | CLO obligations of CFEs | Consolidated Investment Vehicles
Variable Interest Entity [Line Items]
Liabilities	4,090	0
Variable Interest Entity, Primary Beneficiary | Warehouse financing debt | Consolidated Investment Vehicles
Variable Interest Entity [Line Items]
Liabilities	313	0
Variable Interest Entity, Primary Beneficiary | Due to brokers and counterparties | Consolidated Investment Vehicles
Variable Interest Entity [Line Items]
Liabilities	112	4
Variable Interest Entity, Primary Beneficiary | Other liabilities | Consolidated Investment Vehicles
Variable Interest Entity [Line Items]
Liabilities	110	0
Variable Interest Entity, Primary Beneficiary | Consolidated Investment Vehicles
Variable Interest Entity [Line Items]
Assets	5,493	330
Variable Interest Entity, Primary Beneficiary | Consolidated Investment Vehicles | Fund investments: | Equity securities and warrants
Variable Interest Entity [Line Items]
Assets	434	79
Variable Interest Entity, Primary Beneficiary | Consolidated Investment Vehicles | Fund investments: | Structured products
Variable Interest Entity [Line Items]
Assets	128	239
Variable Interest Entity, Primary Beneficiary | Consolidated Investment Vehicles | Fund investments: | Corporate securities
Variable Interest Entity [Line Items]
Assets	96	0
Variable Interest Entity, Primary Beneficiary | Consolidated Investment Vehicles | CLOs and CLO warehouse assets: | Loans in CLOs and CLO warehouses, FVO
Variable Interest Entity [Line Items]
Assets	4,570	0
Variable Interest Entity, Primary Beneficiary | Consolidated Investment Vehicles | CLOs and CLO warehouse assets: | Short-term investments
Variable Interest Entity [Line Items]
Assets	135	0
Variable Interest Entity, Primary Beneficiary | Consolidated Investment Vehicles | Investments in AssuredIM Funds and Other Affiliated Entities
Variable Interest Entity [Line Items]
Assets	392
Variable Interest Entity, Primary Beneficiary | Consolidated Investment Vehicles | Cash and cash equivalents | Fund investments:
Variable Interest Entity [Line Items]
Assets	59	7
Variable Interest Entity, Primary Beneficiary | Consolidated Investment Vehicles | Cash and cash equivalents | CLOs and CLO warehouse assets:
Variable Interest Entity [Line Items]
Assets	38	0
Variable Interest Entity, Primary Beneficiary | Consolidated Investment Vehicles | Other assets | Fund investments:
Variable Interest Entity [Line Items]
Assets	1	5
Variable Interest Entity, Primary Beneficiary | Consolidated Investment Vehicles | Due from brokers and counterparties | CLOs and CLO warehouse assets:
Variable Interest Entity [Line Items]
Assets	$ 32	$ 0
Variable Interest Entity, Primary Beneficiary | Consolidated Investment Vehicles | CLO obligations of CFEs
Variable Interest Entity [Line Items]
CLO's weighted average maturity	6 years 2 months 12 days
CLO's weighted average interest rate	5.30%
Variable Interest Entity, Primary Beneficiary | Consolidated Investment Vehicles | Warehouse financing debt
Variable Interest Entity [Line Items]
CLO's weighted average maturity	1 year 10 months 24 days
CLO's weighted average interest rate	4.50%
Voting Interest Entity | Consolidated Investment Vehicles
Variable Interest Entity [Line Items]
Liabilities	$ 1
Voting Interest Entity | Consolidated Investment Vehicles | Investments
Variable Interest Entity [Line Items]
Assets	$ 58

Fair Value Measurement - Narrat

Fair Value Measurement - Narrative (Details) $ in Millions	9 Months Ended	12 Months Ended
	Sep. 30, 2023 USD ($) Security Trust	Dec. 31, 2022 USD ($)
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Repurchase agreement liability		$ 35
Assured IM
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Obligation to purchase debt		0.05
Total
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Percentage of CDS contracts fair valued Using minimum premium	11.20%
AGC And AGM
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Number of custodial trusts | Trust	4
Share value, amount	$ 200
Maximum amount	$ 50
Recurring | Level 3
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Number of fixed maturity securities valued using model processes | Security	189
Recurring | Level 3 | CDR | Total | Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Conditional prepayment rate	3.62%	2.78%
Recurring | Level 3 | CDR | Total | Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Conditional prepayment rate	5.41%	5.08%

Fair Value Measurement - Financ

Fair Value Measurement - Financial Instruments Carried at Fair Value (Details) - USD ($) $ in Millions	Sep. 30, 2023	Dec. 31, 2022
Assets:
Estimated Fair Value	$ 6,267	$ 7,119
Fixed-maturity securities, trading	350	303
Short-term investments, at fair value	1,426	810
Other invested assets	765	133
FG VIEs’ assets	326	413
Other assets	112	148
Liabilities:
Credit derivative liabilities	50	163
FG VIEs' liabilities	542	715
Obligations of state and political subdivisions
Assets:
Estimated Fair Value	2,766	3,394
U.S. government and agencies
Assets:
Estimated Fair Value	58	111
Corporate securities
Assets:
Estimated Fair Value	2,009	2,084
RMBS
Assets:
Estimated Fair Value	330	340
CMBS
Assets:
Estimated Fair Value	188	271
Non-U.S. government securities
Assets:
Estimated Fair Value	93	98
Fair Value Measured at Net Asset Value Per Share | Fund investments: | Equity securities and warrants | Consolidated Investment Vehicles
Assets:
FG VIEs’ assets		5
Recurring
Assets:
Short-term investments, at fair value	1,426	810
Other invested assets	3	7
Other assets	112	148
Total assets carried at fair value	8,802	14,031
Liabilities:
Credit derivative liabilities	50	163
Other liabilities		7
Total liabilities carried at fair value	592	5,316
Recurring | Financial Guaranty Variable Interest Entities
Liabilities:
FG VIEs' liabilities	542	715
Recurring | Consolidated Investment Vehicles
Liabilities:
FG VIEs' liabilities		4,431
Recurring | Financial Guaranty Variable Interest Entities
Assets:
FG VIEs’ assets	326	413
Recurring | Consolidated Investment Vehicles
Assets:
FG VIEs’ assets	318	5,231
Recurring | Warehouse financing debt | Consolidated Investment Vehicles
Liabilities:
FG VIEs' liabilities		313
Recurring | Securitized borrowing | Consolidated Investment Vehicles
Liabilities:
FG VIEs' liabilities		28
Recurring | CLO obligations of CFEs | Consolidated Investment Vehicles
Liabilities:
FG VIEs' liabilities		4,090
Recurring | Fixed-maturity securities, available-for-sale
Assets:
Estimated Fair Value	6,267	7,119
Fixed-maturity securities, trading	350	303
Recurring | Fixed-maturity securities, available-for-sale | Obligations of state and political subdivisions
Assets:
Estimated Fair Value	2,766	3,394
Recurring | Fixed-maturity securities, available-for-sale | U.S. government and agencies
Assets:
Estimated Fair Value	58	111
Recurring | Fixed-maturity securities, available-for-sale | Corporate securities
Assets:
Estimated Fair Value	2,009	2,084
Recurring | Fixed-maturity securities, available-for-sale | RMBS
Assets:
Estimated Fair Value	330	340
Recurring | Fixed-maturity securities, available-for-sale | CMBS
Assets:
Estimated Fair Value	188	271
Recurring | Fixed-maturity securities, available-for-sale | Asset-backed securities
Assets:
Estimated Fair Value	823	821
Recurring | Fixed-maturity securities, available-for-sale | Non-U.S. government securities
Assets:
Estimated Fair Value	93	98
Recurring | Fund investments: | Corporate securities | Consolidated Investment Vehicles
Assets:
FG VIEs’ assets		96
Recurring | Fund investments: | Equity securities and warrants | Consolidated Investment Vehicles
Assets:
FG VIEs’ assets	79	302
Recurring | Fund investments: | Structured products | Consolidated Investment Vehicles
Assets:
FG VIEs’ assets	239	128
Recurring | CLOs and CLO warehouse assets: | Corporate securities | Consolidated Investment Vehicles
Assets:
FG VIEs’ assets		4,570
Recurring | CLOs and CLO warehouse assets: | Short-term investments | Consolidated Investment Vehicles
Assets:
FG VIEs’ assets		135
Recurring | Level 1
Assets:
Short-term investments, at fair value	1,418	771
Other invested assets	0	2
Other assets	51	54
Total assets carried at fair value	1,469	962
Liabilities:
Credit derivative liabilities	0	0
Other liabilities		0
Total liabilities carried at fair value	0	0
Recurring | Level 1 | Financial Guaranty Variable Interest Entities
Liabilities:
FG VIEs' liabilities	0	0
Recurring | Level 1 | Consolidated Investment Vehicles
Liabilities:
FG VIEs' liabilities		0
Recurring | Level 1 | Financial Guaranty Variable Interest Entities
Assets:
FG VIEs’ assets	0	0
Recurring | Level 1 | Consolidated Investment Vehicles
Assets:
FG VIEs’ assets	0	135
Recurring | Level 1 | Warehouse financing debt | Consolidated Investment Vehicles
Liabilities:
FG VIEs' liabilities		0
Recurring | Level 1 | Securitized borrowing | Consolidated Investment Vehicles
Liabilities:
FG VIEs' liabilities		0
Recurring | Level 1 | CLO obligations of CFEs | Consolidated Investment Vehicles
Liabilities:
FG VIEs' liabilities		0
Recurring | Level 1 | Fixed-maturity securities, available-for-sale
Assets:
Estimated Fair Value	0	0
Fixed-maturity securities, trading	0	0
Recurring | Level 1 | Fixed-maturity securities, available-for-sale | Obligations of state and political subdivisions
Assets:
Estimated Fair Value	0	0
Recurring | Level 1 | Fixed-maturity securities, available-for-sale | U.S. government and agencies
Assets:
Estimated Fair Value	0	0
Recurring | Level 1 | Fixed-maturity securities, available-for-sale | Corporate securities
Assets:
Estimated Fair Value	0	0
Recurring | Level 1 | Fixed-maturity securities, available-for-sale | RMBS
Assets:
Estimated Fair Value	0	0
Recurring | Level 1 | Fixed-maturity securities, available-for-sale | CMBS
Assets:
Estimated Fair Value	0	0
Recurring | Level 1 | Fixed-maturity securities, available-for-sale | Asset-backed securities
Assets:
Estimated Fair Value	0	0
Recurring | Level 1 | Fixed-maturity securities, available-for-sale | Non-U.S. government securities
Assets:
Estimated Fair Value	0	0
Recurring | Level 1 | Fund investments: | Corporate securities | Consolidated Investment Vehicles
Assets:
FG VIEs’ assets		0
Recurring | Level 1 | Fund investments: | Equity securities and warrants | Consolidated Investment Vehicles
Assets:
FG VIEs’ assets	0	0
Recurring | Level 1 | Fund investments: | Structured products | Consolidated Investment Vehicles
Assets:
FG VIEs’ assets	0	0
Recurring | Level 1 | CLOs and CLO warehouse assets: | Corporate securities | Consolidated Investment Vehicles
Assets:
FG VIEs’ assets		0
Recurring | Level 1 | CLOs and CLO warehouse assets: | Short-term investments | Consolidated Investment Vehicles
Assets:
FG VIEs’ assets		135
Recurring | Level 2
Assets:
Short-term investments, at fair value	8	39
Other invested assets	0	0
Other assets	48	46
Total assets carried at fair value	5,938	11,353
Liabilities:
Credit derivative liabilities	0	0
Other liabilities		7
Total liabilities carried at fair value	0	284
Recurring | Level 2 | Financial Guaranty Variable Interest Entities
Liabilities:
FG VIEs' liabilities	0	0
Recurring | Level 2 | Consolidated Investment Vehicles
Liabilities:
FG VIEs' liabilities		277
Recurring | Level 2 | Financial Guaranty Variable Interest Entities
Assets:
FG VIEs’ assets	146	209
Recurring | Level 2 | Consolidated Investment Vehicles
Assets:
FG VIEs’ assets	70	4,657
Recurring | Level 2 | Warehouse financing debt | Consolidated Investment Vehicles
Liabilities:
FG VIEs' liabilities		277
Recurring | Level 2 | Securitized borrowing | Consolidated Investment Vehicles
Liabilities:
FG VIEs' liabilities		0
Recurring | Level 2 | CLO obligations of CFEs | Consolidated Investment Vehicles
Liabilities:
FG VIEs' liabilities		0
Recurring | Level 2 | Fixed-maturity securities, available-for-sale
Assets:
Estimated Fair Value	5,316	6,099
Fixed-maturity securities, trading	350	303
Recurring | Level 2 | Fixed-maturity securities, available-for-sale | Obligations of state and political subdivisions
Assets:
Estimated Fair Value	2,764	3,347
Recurring | Level 2 | Fixed-maturity securities, available-for-sale | U.S. government and agencies
Assets:
Estimated Fair Value	58	111
Recurring | Level 2 | Fixed-maturity securities, available-for-sale | Corporate securities
Assets:
Estimated Fair Value	2,009	2,084
Recurring | Level 2 | Fixed-maturity securities, available-for-sale | RMBS
Assets:
Estimated Fair Value	177	161
Recurring | Level 2 | Fixed-maturity securities, available-for-sale | CMBS
Assets:
Estimated Fair Value	188	271
Recurring | Level 2 | Fixed-maturity securities, available-for-sale | Asset-backed securities
Assets:
Estimated Fair Value	27	27
Recurring | Level 2 | Fixed-maturity securities, available-for-sale | Non-U.S. government securities
Assets:
Estimated Fair Value	93	98
Recurring | Level 2 | Fund investments: | Corporate securities | Consolidated Investment Vehicles
Assets:
FG VIEs’ assets		0
Recurring | Level 2 | Fund investments: | Equity securities and warrants | Consolidated Investment Vehicles
Assets:
FG VIEs’ assets	4	5
Recurring | Level 2 | Fund investments: | Structured products | Consolidated Investment Vehicles
Assets:
FG VIEs’ assets	66	82
Recurring | Level 2 | CLOs and CLO warehouse assets: | Corporate securities | Consolidated Investment Vehicles
Assets:
FG VIEs’ assets		4,570
Recurring | Level 2 | CLOs and CLO warehouse assets: | Short-term investments | Consolidated Investment Vehicles
Assets:
FG VIEs’ assets		0
Recurring | Level 3
Assets:
Short-term investments, at fair value	0	0
Other invested assets	3	5
Other assets	13	48
Total assets carried at fair value	1,395	1,716
Liabilities:
Credit derivative liabilities	50	163
Other liabilities		0
Total liabilities carried at fair value	592	5,032
Recurring | Level 3 | Financial Guaranty Variable Interest Entities
Liabilities:
FG VIEs' liabilities	542	715
Recurring | Level 3 | Consolidated Investment Vehicles
Liabilities:
FG VIEs' liabilities		4,154
Recurring | Level 3 | Financial Guaranty Variable Interest Entities
Assets:
FG VIEs’ assets	180	204
Recurring | Level 3 | Consolidated Investment Vehicles
Assets:
FG VIEs’ assets	248	439
Recurring | Level 3 | Warehouse financing debt | Consolidated Investment Vehicles
Liabilities:
FG VIEs' liabilities		36
Recurring | Level 3 | Securitized borrowing | Consolidated Investment Vehicles
Liabilities:
FG VIEs' liabilities		28
Recurring | Level 3 | CLO obligations of CFEs | Consolidated Investment Vehicles
Liabilities:
FG VIEs' liabilities		4,090
Recurring | Level 3 | Fixed-maturity securities, available-for-sale
Assets:
Estimated Fair Value	951	1,020
Fixed-maturity securities, trading	0	0
Recurring | Level 3 | Fixed-maturity securities, available-for-sale | Obligations of state and political subdivisions
Assets:
Estimated Fair Value	2	47
Recurring | Level 3 | Fixed-maturity securities, available-for-sale | U.S. government and agencies
Assets:
Estimated Fair Value	0	0
Recurring | Level 3 | Fixed-maturity securities, available-for-sale | Corporate securities
Assets:
Estimated Fair Value	0	0
Recurring | Level 3 | Fixed-maturity securities, available-for-sale | RMBS
Assets:
Estimated Fair Value	153	179
Recurring | Level 3 | Fixed-maturity securities, available-for-sale | CMBS
Assets:
Estimated Fair Value	0	0
Recurring | Level 3 | Fixed-maturity securities, available-for-sale | Asset-backed securities
Assets:
Estimated Fair Value	796	794
Recurring | Level 3 | Fixed-maturity securities, available-for-sale | Non-U.S. government securities
Assets:
Estimated Fair Value	0	0
Recurring | Level 3 | Fund investments: | Corporate securities | Consolidated Investment Vehicles
Assets:
FG VIEs’ assets		96
Recurring | Level 3 | Fund investments: | Equity securities and warrants | Consolidated Investment Vehicles
Assets:
FG VIEs’ assets	75	297
Recurring | Level 3 | Fund investments: | Structured products | Consolidated Investment Vehicles
Assets:
FG VIEs’ assets	$ 173	46
Recurring | Level 3 | CLOs and CLO warehouse assets: | Corporate securities | Consolidated Investment Vehicles
Assets:
FG VIEs’ assets		0
Recurring | Level 3 | CLOs and CLO warehouse assets: | Short-term investments | Consolidated Investment Vehicles
Assets:
FG VIEs’ assets		$ 0

Fair Value Measurement - Fair V

Fair Value Measurement - Fair Value Level 3 Rollforward Recurring Basis (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
FG VIEs’ Assets
Fair Value Level 3 Rollforward
Fair value at beginning of period	$ 188	$ 223	$ 204	$ 260
Total pre-tax realized and unrealized gains (losses) recorded in:
Net income (loss)	1	3	0	0
Other comprehensive income (loss)	0	0	0	0
Purchases	0	0	0	0
Sales	0	0	0	0
Settlements	(9)	(16)	(24)	(50)
Consolidations	0			15
Deconsolidations	0		0	(15)
Transfers out of Level 3	0		0
Fair value at end of period	180	210	180	210
Change in unrealized gains/(losses) related to financial instruments held	0	3	(3)	1
Consolidated Investment Vehicles | Equity securities and warrants
Fair Value Level 3 Rollforward
Fair value at beginning of period	290	258	297
Total pre-tax realized and unrealized gains (losses) recorded in:
Net income (loss)	5	(11)	45
Other comprehensive income (loss)	0	0	0
Purchases	3	52	41
Sales	(4)	(2)	(89)
Settlements	0	0	0
Consolidations	0
Deconsolidations	219		219
Transfers out of Level 3	0		0
Fair value at end of period	75	297	75	297
Change in unrealized gains/(losses) related to financial instruments held	6	(11)	6
Consolidated Investment Vehicles | Equity Securities
Fair Value Level 3 Rollforward
Fair value at beginning of period				239
Total pre-tax realized and unrealized gains (losses) recorded in:
Net income (loss)				15
Other comprehensive income (loss)				0
Purchases				57
Sales				(14)
Settlements				0
Consolidations				0
Deconsolidations				0
Fair value at end of period		297		297
Change in unrealized gains/(losses) related to financial instruments held				7
Consolidated Investment Vehicles | Corporate securities
Fair Value Level 3 Rollforward
Fair value at beginning of period	84	90	96	91
Total pre-tax realized and unrealized gains (losses) recorded in:
Net income (loss)	0	(2)	(3)	4
Other comprehensive income (loss)	0	0	0	0
Purchases	0	1	6	2
Sales	0	(2)	(15)	(10)
Settlements	0	0	0	0
Consolidations	0			0
Deconsolidations	84		84	0
Transfers out of Level 3	0		0
Fair value at end of period	0	87	0	87
Change in unrealized gains/(losses) related to financial instruments held	0	(2)	0	3
Consolidated Investment Vehicles | Structured products
Fair Value Level 3 Rollforward
Fair value at beginning of period	0	38	46	0
Total pre-tax realized and unrealized gains (losses) recorded in:
Net income (loss)	7	(3)	9	(6)
Other comprehensive income (loss)	0	0	0	0
Purchases	0	8	0	50
Sales	0	0	(48)	(21)
Settlements	0	0	0	0
Consolidations	0			0
Deconsolidations	(166)		(166)	20
Transfers out of Level 3	0		0
Fair value at end of period	173	43	173	43
Change in unrealized gains/(losses) related to financial instruments held	7	(3)	7	(6)
Other
Fair Value Level 3 Rollforward
Fair value at beginning of period	33	37	50	27
Total pre-tax realized and unrealized gains (losses) recorded in:
Net income (loss)	(20)	1	(33)	12
Other comprehensive income (loss)	0	0	0	(1)
Purchases	0	0	0	0
Sales	0	0	0	0
Settlements	0	0	(4)	0
Consolidations	0			0
Deconsolidations	0		0	0
Transfers out of Level 3	0		0
Fair value at end of period	13	38	13	38
Change in unrealized gains/(losses) related to financial instruments held	(20)	1	(33)	12
Other | Other Comprehensive Income (Loss)
Total pre-tax realized and unrealized gains (losses) recorded in:
Change in unrealized gains/(losses) related to financial instruments held	0	0	0	(1)
Financial Guaranty Variable Interest Entities
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair value at start of period	(699)	(282)	(715)	(289)
Total Pretax Realized And Unrealized Gains (Losses) Recorded As Liabilities [Abstract]
Net income (loss)	17	8	18	34
Other comprehensive income (loss)	13	(4)	14	(1)
Issuances		0		0
Sales		0		0
Settlements	127	27	141	92
Consolidations				(102)
Deconsolidations	0	0	0	15
Fair value at end of period	(542)	(251)	(542)	(251)
Change in unrealized gains/(losses) included in earnings related to financial instruments	9	8	11	57
Change in unrealized gains/(losses) included in OCI related to financial instruments	13	(4)	14	(1)
Liabilities of CIVs
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair value at start of period	(4,199)	(3,987)	(4,154)	(3,705)
Total Pretax Realized And Unrealized Gains (Losses) Recorded As Liabilities [Abstract]
Net income (loss)	0	(31)	(45)	264
Other comprehensive income (loss)	0	41	(13)	97
Issuances		(8)		(1,416)
Sales		2		2
Settlements	0	0	13	401
Consolidations				(26)
Deconsolidations	4,199	(26)	4,199	374
Fair value at end of period	0	(4,009)	0	(4,009)
Change in unrealized gains/(losses) included in earnings related to financial instruments	0	(13)	0	289
Change in unrealized gains/(losses) included in OCI related to financial instruments	0	41	0	97
Obligations of state and political subdivisions | Fixed-maturity securities, available-for-sale
Fair Value Level 3 Rollforward
Fair value at beginning of period	46	51	47	72
Total pre-tax realized and unrealized gains (losses) recorded in:
Net income (loss)	0	0	1	0
Other comprehensive income (loss)	(3)	(3)	(3)	(11)
Purchases	0	0	0	0
Sales	0	0	0	0
Settlements	(1)	0	(3)	(13)
Consolidations	0			0
Deconsolidations	0		0	0
Transfers out of Level 3	(40)		(40)
Fair value at end of period	2	48	2	48
Obligations of state and political subdivisions | Fixed-maturity securities, available-for-sale | Other Comprehensive Income (Loss)
Total pre-tax realized and unrealized gains (losses) recorded in:
Change in unrealized gains/(losses) related to financial instruments held	0	(3)	0	(13)
RMBS | Fixed-maturity securities, available-for-sale
Fair Value Level 3 Rollforward
Fair value at beginning of period	162	184	179	216
Total pre-tax realized and unrealized gains (losses) recorded in:
Net income (loss)	4	3	11	13
Other comprehensive income (loss)	(6)	(8)	(14)	(27)
Purchases	0	22	0	22
Sales	0	0	0	0
Settlements	(7)	(9)	(23)	(32)
Consolidations	0			0
Deconsolidations	0		0	0
Transfers out of Level 3	0		0
Fair value at end of period	153	192	153	192
RMBS | Fixed-maturity securities, available-for-sale | Other Comprehensive Income (Loss)
Total pre-tax realized and unrealized gains (losses) recorded in:
Change in unrealized gains/(losses) related to financial instruments held	(6)	(8)	(13)	(25)
Asset-backed securities | Fixed-maturity securities, available-for-sale
Fair Value Level 3 Rollforward
Fair value at beginning of period	800	805	794	863
Total pre-tax realized and unrealized gains (losses) recorded in:
Net income (loss)	13	2	13	2
Other comprehensive income (loss)	(2)	1	(10)	(36)
Purchases	0	4	23	39
Sales	0	(1)	(2)	(13)
Settlements	(15)	(5)	(22)	(49)
Consolidations	0			0
Deconsolidations	0		0	0
Transfers out of Level 3	0		0
Fair value at end of period	796	806	796	806
Asset-backed securities | Fixed-maturity securities, available-for-sale | Other Comprehensive Income (Loss)
Total pre-tax realized and unrealized gains (losses) recorded in:
Change in unrealized gains/(losses) related to financial instruments held	3	1	0	(35)
Credit Risk Contract
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Fair value at start of period	(57)	(147)	(162)	(154)
Total pre-tax realized and unrealized gains (losses) recorded in:
Net income (loss)	9	(48)	115	(42)
Other comprehensive income (loss)	0	0	0	0
Issuances		0		0
Sales		0		0
Settlements	(1)	1	(2)	2
Consolidations				0
Deconsolidations	0	0	0	0
Fair value at end of period	(49)	(194)	(49)	(194)
Change in unrealized gains/(losses) included in earnings related to financial instruments	$ 9	$ (46)	$ 114	$ (41)

Fair Value Measurement - Quanti

Fair Value Measurement - Quantitative Information - Assets & Liabilities (Details) - Level 3 - USD ($) $ in Millions	9 Months Ended	12 Months Ended
	Sep. 30, 2023	Dec. 31, 2022
Credit derivative liabilities, net
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Internal floor (in bps)	0.00100
Valuation, Income Approach | Credit derivative liabilities, net
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair value	$ (49)	$ (162)
Valuation, Income Approach | FG VIEs' assets
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair value	$ (542)	(715)
Valuation, Income Approach | CLOs | Consolidated Investment Vehicles
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair value		(4,090)
Valuation, Income Approach | Warehouse financing debt | Consolidated Investment Vehicles
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair value		(36)
Valuation, Income Approach | Securitized borrowing | Consolidated Investment Vehicles
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair value		$ (28)
Minimum | Credit derivative liabilities, net
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Hedge cost (as a percent)	0.172%
Bank profit (as a percent)	1.155%	5,100%
Minimum | Valuation, Income Approach | Credit derivative liabilities, net
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Hedge cost (as a percent)		11.50%
Minimum | Valuation, Income Approach | FG VIEs' assets
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Yield (as a percent)	5.50%	4.80%
Minimum | Valuation, Income Approach | CLO obligations of CFEs | Consolidated Investment Vehicles
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Yield (as a percent)		3%
Minimum | Valuation, Income Approach | Warehouse financing debt | Consolidated Investment Vehicles
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Yield (as a percent)		11.70%
Maximum | Credit derivative liabilities, net
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Hedge cost (as a percent)	0.392%
Bank profit (as a percent)	2.932%	27,050%
Maximum | Valuation, Income Approach | Credit derivative liabilities, net
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Hedge cost (as a percent)		25.20%
Maximum | Valuation, Income Approach | FG VIEs' assets
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Yield (as a percent)	11.50%	10.90%
Maximum | Valuation, Income Approach | CLO obligations of CFEs | Consolidated Investment Vehicles
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Yield (as a percent)		27.40%
Maximum | Valuation, Income Approach | Warehouse financing debt | Consolidated Investment Vehicles
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Yield (as a percent)		16.90%
Weighted Average | Credit derivative liabilities, net
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Hedge cost (as a percent)	0.241%
Bank profit (as a percent)	1.557%	10,940%
Weighted Average | Valuation, Income Approach | Credit derivative liabilities, net
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Hedge cost (as a percent)		15.70%
Weighted Average | Valuation, Income Approach | FG VIEs' assets
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Yield (as a percent)	6.50%	5.90%
Weighted Average | Valuation, Income Approach | CLO obligations of CFEs | Consolidated Investment Vehicles
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Yield (as a percent)		5.50%
Weighted Average | Valuation, Income Approach | Warehouse financing debt | Consolidated Investment Vehicles
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Yield (as a percent)		12.90%
CPR | Minimum | Valuation, Income Approach | FG VIEs' assets
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Conditional prepayment rate	0.10%	0.90%
CPR | Maximum | Valuation, Income Approach | FG VIEs' assets
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Conditional prepayment rate	21.20%	21.90%
CPR | Weighted Average | Valuation, Income Approach | FG VIEs' assets
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Conditional prepayment rate	8%	6.30%
CDR | Minimum | Valuation, Income Approach | FG VIEs' assets
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Conditional prepayment rate	1.30%	1.30%
CDR | Maximum | Valuation, Income Approach | FG VIEs' assets
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Conditional prepayment rate	41%	41%
CDR | Weighted Average | Valuation, Income Approach | FG VIEs' assets
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Conditional prepayment rate	9.30%	3.70%
Loss severity | Minimum | Valuation, Income Approach | FG VIEs' assets
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Conditional prepayment rate	45%	45%
Loss severity | Maximum | Valuation, Income Approach | FG VIEs' assets
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Conditional prepayment rate	100%	100%
Loss severity | Weighted Average | Valuation, Income Approach | FG VIEs' assets
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Conditional prepayment rate	82.60%	39.90%
Discount margin | Valuation, Income Approach | Securitized borrowing | Consolidated Investment Vehicles
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Yield (as a percent)		20.90%
Terminal growth rate | Valuation, Income Approach | Securitized borrowing | Consolidated Investment Vehicles
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Yield (as a percent)		3%
Measurement input, EBITDA | Minimum | Valuation, Market Approach | Securitized borrowing | Consolidated Investment Vehicles
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Market multiple-enterprise value/EBITDA		10
Measurement input, EBITDA | Maximum | Valuation, Market Approach | Securitized borrowing | Consolidated Investment Vehicles
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Market multiple-enterprise value/EBITDA		11
Measurement input, EBITDA | Weighted Average | Valuation, Market Approach | Securitized borrowing | Consolidated Investment Vehicles
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Market multiple-enterprise value/EBITDA		10.5
Exit multiple-EBITDA | Valuation, Income Approach | Securitized borrowing | Consolidated Investment Vehicles
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Yield (as a percent)		1,100%
Obligations of state and political subdivisions | Valuation, Income Approach
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Total assets carried at fair value	$ 2	$ 47
Obligations of state and political subdivisions | Minimum | Valuation, Income Approach
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Yield (as a percent)	8.80%	7.40%
Obligations of state and political subdivisions | Maximum | Valuation, Income Approach
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Yield (as a percent)	21.50%	13.50%
Obligations of state and political subdivisions | Weighted Average | Valuation, Income Approach
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Yield (as a percent)	9.10%	9.40%
RMBS | Valuation, Income Approach
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Total assets carried at fair value	$ 153	$ 179
RMBS | Minimum | Valuation, Income Approach
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Yield (as a percent)	8.20%	7.50%
RMBS | Maximum | Valuation, Income Approach
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Yield (as a percent)	11.90%	11.30%
RMBS | Weighted Average | Valuation, Income Approach
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Yield (as a percent)	9.70%	9%
RMBS | CPR | Minimum | Valuation, Income Approach
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Conditional prepayment rate	0%	3.80%
RMBS | CPR | Maximum | Valuation, Income Approach
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Conditional prepayment rate	15%	16.10%
RMBS | CPR | Weighted Average | Valuation, Income Approach
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Conditional prepayment rate	3.90%	8.20%
RMBS | CDR | Minimum | Valuation, Income Approach
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Conditional prepayment rate	1.40%	1.50%
RMBS | CDR | Maximum | Valuation, Income Approach
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Conditional prepayment rate	16%	12%
RMBS | CDR | Weighted Average | Valuation, Income Approach
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Conditional prepayment rate	5.70%	5.90%
RMBS | Loss severity | Minimum | Valuation, Income Approach
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Conditional prepayment rate	50%	50%
RMBS | Loss severity | Maximum | Valuation, Income Approach
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Conditional prepayment rate	125%	125%
RMBS | Loss severity | Weighted Average | Valuation, Income Approach
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Conditional prepayment rate	82.60%	82.50%
Life insurance transactions | Valuation, Income Approach
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Total assets carried at fair value	$ 331	$ 342
Yield (as a percent)	8.10%	11.30%
CLOs | Valuation, Income Approach
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Total assets carried at fair value	$ 454	$ 428
CLOs | Discount margin | Minimum | Valuation, Income Approach
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Yield (as a percent)	1.30%	1.80%
CLOs | Discount margin | Maximum | Valuation, Income Approach
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Yield (as a percent)	7.80%	4.10%
CLOs | Discount margin | Weighted Average | Valuation, Income Approach
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Yield (as a percent)	2.70%	3%
Others | Valuation, Income Approach
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Total assets carried at fair value	$ 11	$ 24
Others | Minimum | Valuation, Income Approach
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Yield (as a percent)	6.30%	7.40%
Others | Maximum | Valuation, Income Approach
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Yield (as a percent)	12.30%	12.90%
Others | Weighted Average | Valuation, Income Approach
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Yield (as a percent)	12.10%	12.80%
FG VIEs' assets | Valuation, Income Approach
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Total assets carried at fair value	$ 180	$ 204
FG VIEs' assets | Minimum | Valuation, Income Approach
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Yield (as a percent)	8.10%	6.60%
FG VIEs' assets | Maximum | Valuation, Income Approach
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Yield (as a percent)	11.50%	10.90%
FG VIEs' assets | Weighted Average | Valuation, Income Approach
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Yield (as a percent)	10.10%	7.50%
FG VIEs' assets | CPR | Minimum | Valuation, Income Approach
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Conditional prepayment rate	0.10%	0.90%
FG VIEs' assets | CPR | Maximum | Valuation, Income Approach
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Conditional prepayment rate	21.20%	21.90%
FG VIEs' assets | CPR | Weighted Average | Valuation, Income Approach
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Conditional prepayment rate	8%	12.90%
FG VIEs' assets | CDR | Minimum | Valuation, Income Approach
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Conditional prepayment rate	1.30%	1.30%
FG VIEs' assets | CDR | Maximum | Valuation, Income Approach
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Conditional prepayment rate	41%	41%
FG VIEs' assets | CDR | Weighted Average | Valuation, Income Approach
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Conditional prepayment rate	9.30%	7.60%
FG VIEs' assets | Loss severity | Minimum | Valuation, Income Approach
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Conditional prepayment rate	45%	45%
FG VIEs' assets | Loss severity | Maximum | Valuation, Income Approach
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Conditional prepayment rate	100%	100%
FG VIEs' assets | Loss severity | Weighted Average | Valuation, Income Approach
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Conditional prepayment rate	82.60%	81%
Structured products | Minimum | Valuation, Income Approach
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Yield (as a percent)	7.50%
Structured products | Maximum | Valuation, Income Approach
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Yield (as a percent)	28.10%
Structured products | Weighted Average | Valuation, Income Approach
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Yield (as a percent)	17.90%
Other assets | Valuation, Income Approach
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Total assets carried at fair value	$ 12	$ 47
Term (years)	10 years	10 years
Other assets | Minimum | Valuation, Income Approach
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Yield (as a percent)	7.70%	7.70%
Other assets | Maximum | Valuation, Income Approach
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Yield (as a percent)	8.20%	8.40%
Other assets | Weighted Average | Valuation, Income Approach
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Yield (as a percent)	7.90%	8.10%
Consolidated Investment Vehicles | Valuation, Income Approach | Equity securities and warrants
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Total assets carried at fair value	$ 75	$ 297
Yield (as a percent)		10%
Consolidated Investment Vehicles | Valuation, Income Approach | Corporate securities
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Total assets carried at fair value		$ 96
Yield (as a percent)		16.30%
Consolidated Investment Vehicles | Valuation, Income Approach | Structured products
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Total assets carried at fair value	$ 173	$ 46
Consolidated Investment Vehicles | Minimum | Valuation, Income Approach | Structured products
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Yield (as a percent)		12.80%
Consolidated Investment Vehicles | Maximum | Valuation, Income Approach | Structured products
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Yield (as a percent)		37.10%
Consolidated Investment Vehicles | Weighted Average | Valuation, Income Approach | Structured products
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Yield (as a percent)		18.90%
Consolidated Investment Vehicles | Discount margin | Valuation, Income Approach | Equity securities and warrants
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Yield (as a percent)	20.90%
Consolidated Investment Vehicles | Discount margin | Minimum | Valuation, Income Approach | Equity securities and warrants
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Yield (as a percent)		19.80%
Consolidated Investment Vehicles | Discount margin | Minimum | Valuation, Income Approach | Corporate securities
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Yield (as a percent)		20.80%
Consolidated Investment Vehicles | Discount margin | Maximum | Valuation, Income Approach | Equity securities and warrants
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Yield (as a percent)		25.10%
Consolidated Investment Vehicles | Discount margin | Maximum | Valuation, Income Approach | Corporate securities
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Yield (as a percent)		23.80%
Consolidated Investment Vehicles | Discount margin | Weighted Average | Valuation, Income Approach | Equity securities and warrants
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Yield (as a percent)		22.70%
Consolidated Investment Vehicles | Discount margin | Weighted Average | Valuation, Income Approach | Corporate securities
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Yield (as a percent)		21.70%
Consolidated Investment Vehicles | Terminal growth rate | Valuation, Income Approach | Equity securities and warrants
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Yield (as a percent)	4%
Consolidated Investment Vehicles | Terminal growth rate | Minimum | Valuation, Income Approach | Equity securities and warrants
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Yield (as a percent)		3%
Consolidated Investment Vehicles | Terminal growth rate | Maximum | Valuation, Income Approach | Equity securities and warrants
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Yield (as a percent)		4%
Consolidated Investment Vehicles | Terminal growth rate | Weighted Average | Valuation, Income Approach | Equity securities and warrants
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Yield (as a percent)		3.50%
Consolidated Investment Vehicles | Measurement input, revenue multiple | Valuation, Market Approach | Equity securities and warrants
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Market multiple-price to book	110%	115%
Exit multiple-price to earnings	525%	450%
Consolidated Investment Vehicles | Measurement input, revenue multiple | Minimum | Valuation, Market Approach | Equity securities and warrants
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Market multiple-enterprise value/revenue		1.05
Consolidated Investment Vehicles | Measurement input, revenue multiple | Maximum | Valuation, Market Approach | Equity securities and warrants
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Market multiple-enterprise value/revenue		1.1
Consolidated Investment Vehicles | Measurement input, revenue multiple | Weighted Average | Valuation, Market Approach | Equity securities and warrants
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Market multiple-enterprise value/revenue		1.08
Consolidated Investment Vehicles | Measurement input, EBITDA | Minimum | Valuation, Market Approach | Equity securities and warrants
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Market multiple-enterprise value/EBITDA		2.5
Consolidated Investment Vehicles | Measurement input, EBITDA | Minimum | Valuation, Market Approach | Corporate securities
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Market multiple-enterprise value/EBITDA		2.5
Consolidated Investment Vehicles | Measurement input, EBITDA | Maximum | Valuation, Market Approach | Equity securities and warrants
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Market multiple-enterprise value/EBITDA		11
Consolidated Investment Vehicles | Measurement input, EBITDA | Maximum | Valuation, Market Approach | Corporate securities
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Market multiple-enterprise value/EBITDA		2.75
Consolidated Investment Vehicles | Measurement input, EBITDA | Weighted Average | Valuation, Market Approach | Equity securities and warrants
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Market multiple-enterprise value/EBITDA		10.25
Consolidated Investment Vehicles | Measurement input, EBITDA | Weighted Average | Valuation, Market Approach | Corporate securities
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Market multiple-enterprise value/EBITDA		2.63
Consolidated Investment Vehicles | Measurement input, cost to sell | Valuation, Income Approach | Equity securities and warrants
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Yield (as a percent)		100%
Consolidated Investment Vehicles | Measurement input, cost to sell | Valuation, Income Approach | Corporate securities
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Yield (as a percent)		100%
Consolidated Investment Vehicles | Exit multiple-EBITDA | Valuation, Market Approach | Corporate securities
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Yield (as a percent)		800%
Consolidated Investment Vehicles | Exit multiple-EBITDA | Minimum | Valuation, Market Approach | Equity securities and warrants
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Yield (as a percent)		800%
Consolidated Investment Vehicles | Exit multiple-EBITDA | Maximum | Valuation, Market Approach | Equity securities and warrants
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Yield (as a percent)		1,200%
Consolidated Investment Vehicles | Exit multiple-EBITDA | Weighted Average | Valuation, Market Approach | Equity securities and warrants
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Yield (as a percent)		1,053%
Consolidated Investment Vehicles | Exit multiple-price to earnings | Valuation, Market Approach | Equity securities and warrants
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Yield (as a percent)	525%	550%
Consolidated Investment Vehicles | Exit multiple-price to book | Valuation, Market Approach | Equity securities and warrants
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Yield (as a percent)	110%	130%
Other invested assets | Valuation, Income Approach
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Total assets carried at fair value	$ 3	$ 5

Fair Value Measurement - Fair_2

Fair Value Measurement - Fair Value of Financial Instruments Not Carried at Fair Value (Details) - USD ($) $ in Millions	Sep. 30, 2023	Dec. 31, 2022
Carrying amount and estimated fair value financial instruments
Assets of consolidated investment vehicles (includes $318 and $5,363, at fair value)	$ 330	$ 5,493
Other assets (includes $112 and $148, at fair value)	549	597
Long-term debt	(1,693)	(1,675)
Liabilities of CIVs	(4)	(4,625)
Other liabilities	(393)	(457)
Carrying Amount
Carrying amount and estimated fair value financial instruments
Assets of consolidated investment vehicles (includes $318 and $5,363, at fair value)	21	46
Other assets (includes $112 and $148, at fair value)	106	92
Financial guaranty insurance contracts	(2,280)	(2,335)
Long-term debt	(1,693)	(1,675)
Liabilities of CIVs	(4)	(170)
Other liabilities	(17)	(43)
Estimated Fair Value
Carrying amount and estimated fair value financial instruments
Assets of consolidated investment vehicles (includes $318 and $5,363, at fair value)	21	46
Other assets (includes $112 and $148, at fair value)	107	93
Financial guaranty insurance contracts	(1,712)	(986)
Long-term debt	(1,477)	(1,477)
Liabilities of CIVs	(4)	(170)
Other liabilities	$ (17)	$ (43)

Asset Management Fees - Asset M

Asset Management Fees - Asset Management Fees (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Disaggregation of Revenue [Line Items]
Asset management fees	$ 0	$ 16	$ 53	$ 71
Management fees
Disaggregation of Revenue [Line Items]
Asset management fees	0	11	21	41
Performance fees
Disaggregation of Revenue [Line Items]
Asset management fees	0	2	18	17
Reimbursable fund expenses
Disaggregation of Revenue [Line Items]
Asset management fees	$ 0	$ 3	$ 14	$ 13

Long-Term Debt - Principal Carr

Long-Term Debt - Principal Carrying Amount of Debt (Details) - USD ($) $ in Millions	Sep. 30, 2023	Aug. 21, 2023	Dec. 31, 2022
Debt Instrument [Line Items]
Debt Instrument, Face Amount	$ 1,746		$ 1,726
Long-term Debt	$ 1,693		1,675
Senior Notes | AGUS | 5% Senior Notes
Debt Instrument [Line Items]
Interest rate of debt (as a percent)	5%
Debt Instrument, Face Amount	$ 0		330
Long-term Debt	$ 0		329
Senior Notes | AGUS | 6.125% Senior Notes
Debt Instrument [Line Items]
Interest rate of debt (as a percent)	6.125%	6.125%
Debt Instrument, Face Amount	$ 350	$ 350	0
Long-term Debt	$ 345		0
Senior Notes | AGUS | 3.15% Senior Notes
Debt Instrument [Line Items]
Interest rate of debt (as a percent)	3.15%
Debt Instrument, Face Amount	$ 500		500
Long-term Debt	$ 495		495
Senior Notes | AGUS | 7% Senior Notes
Debt Instrument [Line Items]
Interest rate of debt (as a percent)	700%
Debt Instrument, Face Amount	$ 200		200
Long-term Debt	$ 198		198
Senior Notes | AGUS | 3.6% Senior Notes
Debt Instrument [Line Items]
Interest rate of debt (as a percent)	3.60%
Debt Instrument, Face Amount	$ 400		400
Long-term Debt	395		395
Enhanced Junior Subordinated Debentures | AGUS
Debt Instrument [Line Items]
Debt Instrument, Face Amount	150		150
Long-term Debt	150		150
Junior Subordinated Debentures | AGMH
Debt Instrument [Line Items]
Debt Instrument, Face Amount	146		146
Long-term Debt	$ 110		$ 108

Long-Term Debt - Narrative (Det

Long-Term Debt - Narrative (Details) - USD ($)				9 Months Ended
	Sep. 25, 2023	Aug. 21, 2023	Aug. 16, 2023	Sep. 30, 2023	Sep. 30, 2022	Dec. 31, 2022
Debt Instrument [Line Items]
Debt instrument, face amount				$ 1,746,000,000		$ 1,726,000,000
Repayments of long-term debt				$ 330,000,000	$ 0
6.125% Senior Notes | Senior Notes | AGUS
Debt Instrument [Line Items]
Interest rate of debt (as a percent)		6.125%		6.125%
Debt instrument, face amount		$ 350,000,000		$ 350,000,000		0
Net proceeds from issuance of debt		$ 345,000,000
Redemption price, percentage			100%
Basis spread on variable rate			0.30%
5% Senior Notes | Senior Notes | AGUS
Debt Instrument [Line Items]
Interest rate of debt (as a percent)				5%
Debt instrument, face amount				$ 0		330,000,000
Repayments of long-term debt	$ 330,000,000
3.6% Senior Notes | Senior Notes | AGUS
Debt Instrument [Line Items]
Interest rate of debt (as a percent)				3.60%
Debt instrument, face amount				$ 400,000,000		$ 400,000,000

Income Taxes - Deferred and Cur

Income Taxes - Deferred and Current Tax Liabilities (Details) - USD ($) $ in Millions	Sep. 30, 2023	Dec. 31, 2022
Income Tax Disclosure [Abstract]
Net deferred tax assets (liabilities)	$ 82	$ 114
Net current tax assets (liabilities)	$ 34	$ 63

Income Taxes - Narrative (Detai

Income Taxes - Narrative (Details) - USD ($) $ in Millions		9 Months Ended	12 Months Ended	72 Months Ended
	Apr. 01, 2023	Sep. 30, 2023	Dec. 31, 2023	Mar. 31, 2023	Dec. 31, 2022
Income Taxes [Line Items]
Decrease in valuation allowance		$ 3
Valuation allowance		$ 2			$ 5
Realization assessment period		3 years
Foreign Tax Authority
Income Taxes [Line Items]
Corporate tax rate		21%
United Kingdom
Income Taxes [Line Items]
Corporate tax rate	25%			19%
United Kingdom | Subsequent Event
Income Taxes [Line Items]
Corporate tax rate			23.50%
France
Income Taxes [Line Items]
Corporate tax rate		25%

Income Taxes - Effective Tax Ra

Income Taxes - Effective Tax Rate Reconciliation and Pretax Income (Loss) and Revenue by Tax Jurisdiction (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Pre-tax Income Taxes and Revenue [Line Items]
Expected tax provision (benefit)	$ 45	$ (6)	$ 88	$ 6
Tax-exempt interest	(3)	(3)	(9)	(10)
NCI	(1)	1	(4)	(5)
Return to provision adjustment	(6)	(20)	(6)	(20)
State taxes	1	2	8	10
Foreign taxes	7	(1)	8	9
Taxes on reinsurance	(1)	0	(1)	(1)
Stock based compensation	2	0	2	4
Other	(1)	0	(2)	1
Total provision (benefit) for income taxes	$ 43	$ (27)	$ 84	$ (6)
Effective tax rate	21.40%	123.50%	18.10%	(12.10%)
Pretax income (loss)	$ 202	$ (22)	$ 466	$ 49
Revenues	403	41	1,046	431
United States
Pre-tax Income Taxes and Revenue [Line Items]
Pretax income (loss)	233	3	458	112
Revenues	373	60	901	435
Bermuda
Pre-tax Income Taxes and Revenue [Line Items]
Pretax income (loss)	(17)	10	41	27
Revenues	30	4	123	43
U.K.
Pre-tax Income Taxes and Revenue [Line Items]
Pretax income (loss)	(10)	(30)	(25)	(75)
Revenues	1	(21)	22	(39)
Other
Pre-tax Income Taxes and Revenue [Line Items]
Pretax income (loss)	(4)	(5)	(8)	(15)
Revenues	$ (1)	$ (2)	$ 0	$ (8)

Commitments and Contingencies -

Commitments and Contingencies - Narrative (Details) - LBIE vs. AG Financial Products $ in Millions	Jul. 01, 2023 USD ($)	Jun. 30, 2023 USD ($)	Mar. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)	Mar. 15, 2013 Transaction	Nov. 28, 2011 USD ($) Transaction
Pending Litigation
Commitments and Contingencies Legal Proceedings
Amount awarded from other party		$ 54
Amount awarded from other party, annual interest rate		8%
Damages sought	$ 58
AG Financial Products Inc. | Guarantee Obligations
Commitments and Contingencies Legal Proceedings
Number of credit derivative transactions for which termination payment is alleged to be improperly calculated | Transaction					9	9
AG Financial Products Inc. | Positive Outcome of Litigation | Pending Litigation
Commitments and Contingencies Legal Proceedings
Termination payments which LBIE owes to AG Financial Products as per calculation of AG Financial Products						$ 4
Other credit derivative transactions which LBIE owes to AG Financial Products as per calculation of AG financial products						$ 21
Loss contingency accrual			$ 0	$ 20
Lehman Brothers International (Europe)
Commitments and Contingencies Legal Proceedings
Gain contingency, number of credit derivative transactions with improperly calculated payments | Transaction						28
Lehman Brothers International (Europe) | Positive Outcome of Litigation | Pending Litigation
Commitments and Contingencies Legal Proceedings
Termination payments which AG Financial Products owes to LBIE as per calculation of LBIE						$ 1,400

Shareholders' Equity - Changes

Shareholders' Equity - Changes in AOCI by Component (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Changes in Accumulated Other Comprehensive Income [Roll Forward]
Beginning balance			$ 5,064
Other comprehensive income (loss) before reclassifications	$ (120)	$ (294)	(74)	$ (993)
Less: Amounts reclassified from AOCI to:
Net realized investment gains (losses)	(9)	(14)	(20)	(39)
Interest expense	24	20	67	60
Income (loss) before income taxes	202	(22)	466	49
Tax (provision) benefit	(43)	27	(84)	6
Other comprehensive income (loss)	(107)	(282)	(50)	(952)
Ending balance	5,252		5,252
Reclassification out of Accumulated Other Comprehensive Income
Less: Amounts reclassified from AOCI to:
Net realized investment gains (losses)	(9)	(14)	(20)	(48)
Fair value gains (losses) on FG VIEs				(2)
Interest expense			1
Income (loss) before income taxes	(15)	(14)	(27)	(50)
Tax (provision) benefit	2	2	3	9
Total amount reclassified from AOCI, net of tax	(13)	(12)	(24)	(41)
Reclassification out of Accumulated Other Comprehensive Income | Financial Guaranty Variable Interest Entities
Less: Amounts reclassified from AOCI to:
Fair value gains (losses) on FG VIEs			(2)
Reclassification out of Accumulated Other Comprehensive Income | Consolidated Investment Vehicles
Less: Amounts reclassified from AOCI to:
Fair value gains (losses) on FG VIEs	(6)		(6)
Total AOCI
Changes in Accumulated Other Comprehensive Income [Roll Forward]
Beginning balance	(458)	(370)	(515)	300
Less: Amounts reclassified from AOCI to:
Ending balance	(565)	(652)	(565)	(652)
No Credit Impairment
Changes in Accumulated Other Comprehensive Income [Roll Forward]
Beginning balance	(284)	(205)	(343)	375
Other comprehensive income (loss) before reclassifications	(115)	(286)	(54)	(886)
Less: Amounts reclassified from AOCI to:
Other comprehensive income (loss)	(113)	(277)	(54)	(857)
Ending balance	(397)	(482)	(397)	(482)
No Credit Impairment | Reclassification out of Accumulated Other Comprehensive Income
Less: Amounts reclassified from AOCI to:
Net realized investment gains (losses)	(2)	(11)	2	(35)
Fair value gains (losses) on FG VIEs				0
Interest expense			0
Income (loss) before income taxes	(2)	(11)	2	(35)
Tax (provision) benefit	0	2	(2)	6
Total amount reclassified from AOCI, net of tax	(2)	(9)	0	(29)
No Credit Impairment | Reclassification out of Accumulated Other Comprehensive Income | Financial Guaranty Variable Interest Entities
Less: Amounts reclassified from AOCI to:
Fair value gains (losses) on FG VIEs			0
No Credit Impairment | Reclassification out of Accumulated Other Comprehensive Income | Consolidated Investment Vehicles
Less: Amounts reclassified from AOCI to:
Fair value gains (losses) on FG VIEs	0		0
Credit Impairment
Changes in Accumulated Other Comprehensive Income [Roll Forward]
Beginning balance	(115)	(107)	(110)	(24)
Other comprehensive income (loss) before reclassifications	(14)	(1)	(31)	(92)
Less: Amounts reclassified from AOCI to:
Other comprehensive income (loss)	(8)	2	(13)	(81)
Ending balance	(123)	(105)	(123)	(105)
Credit Impairment | Reclassification out of Accumulated Other Comprehensive Income
Less: Amounts reclassified from AOCI to:
Net realized investment gains (losses)	(7)	(3)	(22)	(13)
Fair value gains (losses) on FG VIEs				0
Interest expense			0
Income (loss) before income taxes	(7)	(3)	(22)	(13)
Tax (provision) benefit	1	0	4	2
Total amount reclassified from AOCI, net of tax	(6)	(3)	(18)	(11)
Credit Impairment | Reclassification out of Accumulated Other Comprehensive Income | Financial Guaranty Variable Interest Entities
Less: Amounts reclassified from AOCI to:
Fair value gains (losses) on FG VIEs			0
Credit Impairment | Reclassification out of Accumulated Other Comprehensive Income | Consolidated Investment Vehicles
Less: Amounts reclassified from AOCI to:
Fair value gains (losses) on FG VIEs	0		0
ISCR on FG VIEs’ Liabilities with Recourse
Changes in Accumulated Other Comprehensive Income [Roll Forward]
Beginning balance	(22)	(19)	(23)	(21)
Other comprehensive income (loss) before reclassifications	10	(3)	9	(2)
Less: Amounts reclassified from AOCI to:
Other comprehensive income (loss)	10	(3)	11	(1)
Ending balance	(12)	(22)	(12)	(22)
ISCR on FG VIEs’ Liabilities with Recourse | Reclassification out of Accumulated Other Comprehensive Income
Less: Amounts reclassified from AOCI to:
Net realized investment gains (losses)	0	0	0	0
Fair value gains (losses) on FG VIEs				(2)
Interest expense			0
Income (loss) before income taxes	0	0	(2)	(2)
Tax (provision) benefit	0	0	0	1
Total amount reclassified from AOCI, net of tax	0	0	(2)	(1)
ISCR on FG VIEs’ Liabilities with Recourse | Reclassification out of Accumulated Other Comprehensive Income | Financial Guaranty Variable Interest Entities
Less: Amounts reclassified from AOCI to:
Fair value gains (losses) on FG VIEs			(2)
ISCR on FG VIEs’ Liabilities with Recourse | Reclassification out of Accumulated Other Comprehensive Income | Consolidated Investment Vehicles
Less: Amounts reclassified from AOCI to:
Fair value gains (losses) on FG VIEs	0		0
Cumulative Translation Adjustment
Changes in Accumulated Other Comprehensive Income [Roll Forward]
Beginning balance	(42)	(45)	(45)	(36)
Other comprehensive income (loss) before reclassifications	(1)	(4)	2	(13)
Less: Amounts reclassified from AOCI to:
Other comprehensive income (loss)	4	(4)	7	(13)
Ending balance	(38)	(49)	(38)	(49)
Cumulative Translation Adjustment | Reclassification out of Accumulated Other Comprehensive Income
Less: Amounts reclassified from AOCI to:
Net realized investment gains (losses)	0	0	0	0
Fair value gains (losses) on FG VIEs				0
Interest expense			0
Income (loss) before income taxes	(6)	0	(6)	0
Tax (provision) benefit	1	0	1	0
Total amount reclassified from AOCI, net of tax	(5)	0	(5)	0
Cumulative Translation Adjustment | Reclassification out of Accumulated Other Comprehensive Income | Financial Guaranty Variable Interest Entities
Less: Amounts reclassified from AOCI to:
Fair value gains (losses) on FG VIEs			0
Cumulative Translation Adjustment | Reclassification out of Accumulated Other Comprehensive Income | Consolidated Investment Vehicles
Less: Amounts reclassified from AOCI to:
Fair value gains (losses) on FG VIEs	(6)		(6)
Cash Flow  Hedge
Changes in Accumulated Other Comprehensive Income [Roll Forward]
Beginning balance	5	6	6	6
Other comprehensive income (loss) before reclassifications	0	0	0	0
Less: Amounts reclassified from AOCI to:
Other comprehensive income (loss)	0	0	(1)	0
Ending balance	5	6	5	6
Cash Flow  Hedge | Reclassification out of Accumulated Other Comprehensive Income
Less: Amounts reclassified from AOCI to:
Net realized investment gains (losses)	0	0	0	0
Fair value gains (losses) on FG VIEs				0
Interest expense			1
Income (loss) before income taxes	0	0	1	0
Tax (provision) benefit	0	0	0	0
Total amount reclassified from AOCI, net of tax	0	$ 0	1	$ 0
Cash Flow  Hedge | Reclassification out of Accumulated Other Comprehensive Income | Financial Guaranty Variable Interest Entities
Less: Amounts reclassified from AOCI to:
Fair value gains (losses) on FG VIEs			0
Cash Flow  Hedge | Reclassification out of Accumulated Other Comprehensive Income | Consolidated Investment Vehicles
Less: Amounts reclassified from AOCI to:
Fair value gains (losses) on FG VIEs	$ 0		$ 0

Shareholders' Equity - Shares R

Shareholders' Equity - Shares Repurchased (Details) - USD ($) $ / shares in Units, $ in Millions	1 Months Ended	3 Months Ended							9 Months Ended		10 Months Ended	12 Months Ended
	Nov. 07, 2023	Sep. 30, 2023	Jun. 30, 2023	Mar. 31, 2023	Dec. 31, 2022	Sep. 30, 2022	Jun. 30, 2022	Mar. 31, 2022	Sep. 30, 2023	Sep. 30, 2022	Nov. 07, 2023	Dec. 31, 2022	Nov. 01, 2023
Equity, Class of Treasury Stock [Line Items]
Repurchases of common stock									$ 90	$ 400
Common Shares
Equity, Class of Treasury Stock [Line Items]
Shares repurchased (in shares)		1,065,902	453,942	36,369	1,713,416	1,790,395	2,605,947	2,738,223				8,847,981
Repurchases of common stock		$ 64	$ 24	$ 2	$ 100	$ 97	$ 151	$ 155				$ 503
Average price paid per share (in dollars per share)		$ 59.67	$ 53.08	$ 62.23	$ 58.34	$ 53.77	$ 58.03	$ 56.62				$ 56.79
Common Shares | Subsequent Event
Equity, Class of Treasury Stock [Line Items]
Repurchased additional authorized amount													$ 300
Remaining capacity of shares repurchase program	$ 372										$ 372
Shares repurchased (in shares)	682,676										2,238,889
Repurchases of common stock	$ 42										$ 132
Average price paid per share (in dollars per share)	$ 61.17										$ 58.83

Earnings Per Share (Details)

Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Basic Earnings Per Share (EPS):
Net income (loss) attributable to AGL	$ 157	$ 11	$ 363	$ 30
Less: Distributed and undistributed income (loss) available to nonvested shareholders	2	0	3	0
Distributed and undistributed income (loss) available to common shareholders of AGL and subsidiaries, basic	$ 155	$ 11	$ 360	$ 30
Basic shares (in shares)	58.5	61.7	58.9	63.9
Basic EPS (in dollars per share)	$ 2.65	$ 0.18	$ 6.11	$ 0.47
Diluted EPS:
Distributed and undistributed income (loss) available to common shareholders of AGL and subsidiaries, basic	$ 155	$ 11	$ 360	$ 30
Plus: Re-allocation of undistributed income (loss) available to nonvested shareholders of AGL and subsidiaries	0	0	0	0
Distributed and undistributed income (loss) available to common shareholders of AGL and subsidiaries, diluted	$ 155	$ 11	$ 360	$ 30
Basic shares (in shares)	58.5	61.7	58.9	63.9
Dilutive securities:
Options and restricted stock awards (in shares)	1.1	1.2	1.1	1.2
Diluted shares (in shares)	59.6	62.9	60	65.1
Diluted EPS (in dollars per share)	$ 2.60	$ 0.18	$ 5.99	$ 0.46
Potentially dilutive securities excluded from computation of EPS because of antidilutive effect (in shares)	0.1	0.1	0.1	0.8