CNA Financial (CNA) 10-Q 6 May 24 2024 Q1 Quarterly report Financial data

Cover Page

Cover Page - shares	3 Months Ended
	Mar. 31, 2024	May 02, 2024
Entity Information [Line Items]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Mar. 31, 2024
Current Fiscal Year End Date	--12-31
Document Transition Report	false
Entity File Number	1-5823
Entity Registrant Name	CNA FINANCIAL CORPORATION
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	36-6169860
Entity Address, Address Line One	151 N. Franklin
Entity Address, Postal Zip Code	60606
Entity Address, City or Town	Chicago,
Entity Address, State or Province	IL
City Area Code	312
Local Phone Number	822-5000
Title of 12(b) Security	Common Stock, Par value $2.50
Trading Symbol	CNA
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
ICFR Auditor Attestation Flag
Entity Shell Company	false
Entity Common Stock, Shares Outstanding (in shares)		271,282,010
Entity Central Index Key	0000021175
Document Fiscal Year Focus	2024
Document Fiscal Period Focus	Q1
Amendment Flag	false
New York Stock Exchange
Entity Information [Line Items]
Security Exchange Name	NYSE
Chicago Stock Exchange
Entity Information [Line Items]
Security Exchange Name	CHX

Condensed Consolidated Statemen

Condensed Consolidated Statements of Operations (Unaudited) - USD ($) shares in Millions, $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Revenues
Net earned premiums	$ 2,441	$ 2,248
Net investment income	609	525
Net investment losses	(22)	(35)
Non-insurance warranty revenue	407	407
Other revenues	9	7
Total revenues	3,444	3,152
Claims, Benefits and Expenses
Insurance claims and policyholders’ benefits (re-measurement (loss) gain of $(15) and $1)	1,807	1,653
Amortization of deferred acquisition costs	444	379
Non-insurance warranty expense	394	384
Other operating expenses	337	337
Interest	35	28
Total claims, benefits and expenses	3,017	2,781
Income before income tax	427	371
Income tax expense	(89)	(74)
Net income	$ 338	$ 297
Basic earnings per share
Basic earnings per share (in usd per share)	$ 1.24	$ 1.10
Diluted earnings per share
Diluted earnings per share (in usd per share)	$ 1.24	$ 1.09
Weighted Average Outstanding Common Stock and Common Stock Equivalents
Basic (in shares)	271.6	271.3
Diluted (in shares)	272.7	272.3

Condensed Consolidated Statem_2

Condensed Consolidated Statements of Operations (Unaudited) - (Parenthetical) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Income Statement [Abstract]
Insurance claims and policyholders benefits, including policyholders' dividends, remeasurement impact	$ (15)	$ 1

Condensed Consolidated Statem_3

Condensed Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Net income	$ 338	$ 297
Other Comprehensive Income, net of tax
Net unrealized gains and losses on investments	(215)	662
Impact of changes in discount rates used to measure long-duration contract liabilities	341	(396)
Foreign currency translation adjustment	(32)	17
Pension and postretirement benefits	6	7
Other comprehensive income, net of tax	100	290
Total comprehensive income	438	587
Investments
Other Comprehensive Income, net of tax
Net unrealized gains and losses on investments	2	(8)
Net unrealized gains and losses on other investments
Other Comprehensive Income, net of tax
Net unrealized gains and losses on investments	$ (217)	$ 670

Condensed Consolidated Balance

Condensed Consolidated Balance Sheets - USD ($) $ in Millions	Mar. 31, 2024	Dec. 31, 2023
Investments:
Fixed maturity securities at fair value (amortized cost of $42,878 and $42,414, less allowance for credit loss of $20 and $16)	$ 40,605	$ 40,425
Equity securities at fair value (cost of $681 and $686)	691	683
Limited partnership investments	2,274	2,174
Other invested assets	79	80
Mortgage loans (less allowance for credit loss of $35 and $35)	1,029	1,035
Short-term investments	1,996	2,165
Total investments	46,674	46,562
Cash	409	345
Reinsurance receivables (less allowance for uncollectible receivables of $22 and $22)	5,574	5,412
Insurance receivables (less allowance for uncollectible receivables of $26 and $28)	3,432	3,442
Accrued investment income	447	444
Deferred acquisition costs	927	896
Deferred income taxes	942	1,016
Property and equipment at cost (less accumulated depreciation of $303 and $296)	256	253
Goodwill	146	146
Deferred non-insurance warranty acquisition expense	3,621	3,661
Other assets (includes $— and $23 due from Loews Corporation)	2,647	2,534
Total assets	65,075	64,711
Insurance reserves:
Claim and claim adjustment expenses	23,588	23,304
Unearned premiums	7,046	6,933
Future policy benefits	13,513	13,959
Short-term debt	550	550
Long-term debt	2,970	2,481
Deferred non-insurance warranty revenue	4,645	4,694
Other liabilities (includes $29 and $28 due to Loews Corporation)	3,101	2,897
Total liabilities	55,413	54,818
Commitments and contingencies (Notes C and G)
Stockholders' Equity
Common stock ($2.50 par value; 500,000,000 shares authorized; 273,040,243 shares issued; 271,279,498 and 270,881,457 shares outstanding)	683	683
Additional paid-in capital	2,201	2,221
Retained earnings	9,425	9,755
Accumulated other comprehensive loss	(2,572)	(2,672)
Treasury stock (1,760,745 and 2,158,786 shares), at cost	(75)	(94)
Total stockholders’ equity	9,662	9,893
Total liabilities and stockholders' equity	$ 65,075	$ 64,711

Condensed Consolidated Balanc_2

Condensed Consolidated Balance Sheets - (Parenthetical) - USD ($) $ in Millions	Mar. 31, 2024	Dec. 31, 2023
Fixed maturities securities at amortized cost	$ 42,878	$ 42,414
Marketable securities fixed maturities allowance for credit loss	20	16
Equity securities at cost	681	686
Mortgage loans on real estate commercial and consumer allowance for credit loss	35	35
Allowance for uncollectible reinsurance	22	22
Allowance for uncollectible insurance receivables	26	28
Accumulated depreciation on property and equipment	303	296
Other assets (includes $— and $23 due from Loews Corporation)	2,647	2,534
Other liabilities (includes $29 and $28 due to Loews Corporation)	$ 3,101	$ 2,897
Common stock, par value (in usd per share)	$ 2.50	$ 2.50
Common stock, shares authorized (in shares)	500,000,000	500,000,000
Common stock, shares issued (in shares)	273,040,243	273,040,243
Common stock, shares outstanding (in shares)	271,279,498	270,881,457
Treasury stock, shares (in shares)	1,760,745	2,158,786
Related Party
Other assets (includes $— and $23 due from Loews Corporation)	$ 0	$ 23
Other liabilities (includes $29 and $28 due to Loews Corporation)	$ 29	$ 28

Condensed Consolidated Statem_4

Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Cash Flows from Operating Activities
Net income	$ 338	$ 297
Adjustments to reconcile net income to net cash flows provided by operating activities:
Deferred income tax expense	39	21
Trading portfolio activity	0	(13)
Net investment losses	22	35
Equity method investees	(25)	6
Net amortization of investments	(57)	(46)
Depreciation and amortization	16	12
Changes in:
Receivables, net	(162)	(24)
Accrued investment income	(4)	(13)
Deferred acquisition costs	(34)	(45)
Insurance reserves	443	432
Other, net	(72)	(226)
Net cash flows provided by operating activities	504	436
Dispositions:
Fixed maturity securities - sales	736	1,414
Fixed maturity securities - maturities, calls and redemptions	507	317
Equity securities	186	62
Limited partnerships	12	28
Mortgage loans	18	39
Purchases:
Fixed maturity securities	(1,621)	(2,258)
Equity securities	(169)	(82)
Limited partnerships	(77)	(116)
Mortgage loans	(12)	(12)
Change in other investments	(2)	(2)
Change in short-term investments	192	681
Purchases of property and equipment	(20)	(20)
Other, net	1	0
Net cash flows (used) provided by investing activities	(249)	51
Cash Flows from Financing Activities
Dividends paid to common stockholders	(667)	(445)
Proceeds from the issuance of debt	490	0
Purchase of treasury stock	0	(24)
Other, net	(12)	(11)
Net cash flows used by financing activities	(189)	(480)
Effect of foreign exchange rate changes on cash	(2)	1
Net change in cash	64	8
Cash, beginning of year	345	475
Cash, end of period	$ 409	$ 483

Condensed Consolidated Statem_5

Condensed Consolidated Statements of Stockholders' Equity (Unaudited) - USD ($) $ in Millions	Total	Common Stock	Additional Paid-in Capital	Retained Earnings	Retained Earnings Previously Reported	Retained Earnings Revision of Prior Period, Accounting Standards Update, Adjustment	Accumulated Other Comprehensive Loss	Accumulated Other Comprehensive Loss Previously Reported	Accumulated Other Comprehensive Loss Revision of Prior Period, Accounting Standards Update, Adjustment	Treasury Stock
Total stockholder's equity at beginning of period at Dec. 31, 2022		$ 683	$ 2,220	$ 9,336	$ 9,572	$ (236)	$ (3,598)	$ (3,557)	$ (41)	$ (93)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based compensation			(24)							22
Dividends to common stockholders ($2.44 and $1.62 per share)				(442)
Net income	$ 297			297
Other comprehensive income	290						290
Purchase of treasury stock	(24)									(24)
Total stockholder's equity at end of period at Mar. 31, 2023	8,667	683	2,196	9,191			(3,308)			(95)
Total stockholder's equity at beginning of period at Dec. 31, 2023	9,893	683	2,221	9,755	$ 9,755	$ 0	(2,672)	$ (2,672)	$ 0	(94)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based compensation			(20)							19
Dividends to common stockholders ($2.44 and $1.62 per share)				(668)
Net income	338			338
Other comprehensive income	100						100
Purchase of treasury stock										0
Total stockholder's equity at end of period at Mar. 31, 2024	$ 9,662	$ 683	$ 2,201	$ 9,425			$ (2,572)			$ (75)

Condensed Consolidated Statem_6

Condensed Consolidated Statements of Stockholders' Equity (Unaudited) - (Parenthetical) - $ / shares	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Statement of Stockholders' Equity [Abstract]
Dividends declared per share (usd per share)	$ 2.44	$ 1.62

General

General	3 Months Ended
	Mar. 31, 2024
Accounting Policies [Abstract]
General	General Basis of Presentation The Condensed Consolidated Financial Statements include the accounts of CNA Financial Corporation (CNAF) and its subsidiaries. Collectively, CNAF and its subsidiaries are referred to as CNA or the Company. Loews Corporation (Loews) owned approximately 92% of the outstanding common stock of CNAF as of March 31, 2024. The accompanying Condensed Consolidated Financial Statements have been prepared in conformity with accounting principles generally accepted in the United States of America (GAAP). Intercompany amounts have been eliminated. Certain financial information that is normally included in annual financial statements prepared in accordance with GAAP, including certain financial statement notes, is not required for interim reporting purposes and has been condensed or omitted. These statements should be read in conjunction with the Consolidated Financial Statements and notes thereto included in CNAF's Annual Report on Form 10-K filed with the Securities and Exchange Commission (SEC) for the year ended December 31, 2023, including the summary of significant accounting policies in Note A. The preparation of Condensed Consolidated Financial Statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and the disclosure of contingent assets and liabilities at the date of the Condensed Consolidated Financial Statements and the reported amounts of revenues and expenses during the reporting period. Actual results may differ from those estimates. The interim financial data as of March 31, 2024 and for the three months ended March 31, 2024 and 2023 is unaudited. However, in the opinion of management, the interim data includes all adjustments, including normal recurring adjustments, necessary for a fair statement of the Company's results for the interim periods in accordance with GAAP. The results of operations for the interim periods are not necessarily indicative of the results to be expected for the full year. Accounting Standards Pending Adoption In November 2023, the Financial Accounting Standards Board (FASB) issued Accounting Standards Update (ASU) No. 2023-07, Segment Reporting (Topic 280): Improvements to Reportable Segment Disclosures . The updated accounting guidance requires expanded reportable segment disclosures, primarily related to significant segment expenses which are regularly provided to the company’s Chief Operating Decision Maker. The guidance is effective for fiscal years beginning after December 15, 2023, and interim periods within annual periods beginning after December 15, 2024. Retrospective application is required. The Company is currently evaluating the effect the updated guidance will have on the Company's financial statement disclosures. In December 2023, the FASB issued ASU No. 2023-09, Income Taxes (Topic 740): Improvements to Income Tax Disclosures . The updated accounting guidance requires expanded income tax disclosures, including the disaggregation of existing disclosures related to the tax rate reconciliation and income taxes paid. The guidance is effective for annual periods beginning after December 15, 2024. Prospective application is required, with retrospective application permitted. The Company is currently evaluating the effect the updated guidance will have on the Company's financial statement disclosures.

Earnings (Loss) Per Share Data

Earnings (Loss) Per Share Data	3 Months Ended
	Mar. 31, 2024
Earnings Per Share [Abstract]
Earnings (Loss) Per Share Data	Earnings (Loss) Per Share Data Earnings (loss) per share is based on weighted average number of outstanding common shares. Basic earnings (loss) per share excludes the impact of dilutive securities and is computed by dividing Net income (loss) by the weighted average number of common shares outstanding for the period. Diluted earnings (loss) per share reflects the potential dilution that could occur if securities or other contracts to issue common stock were exercised or converted into common stock. The following table presents the income and share data used in the basic and diluted earnings per share computations. Three months ended March 31 (In millions, except per share data) 2024 2023 Net income (loss) $ 338 $ 297 Common Stock and Common Stock Equivalents Basic Weighted average shares outstanding 271.6 271.3 Diluted Weighted average shares outstanding 271.6 271.3 Dilutive effect of stock-based awards under compensation plans 1.1 1.0 Total 272.7 272.3 Earnings (loss) per share Basic $ 1.24 $ 1.10 Diluted $ 1.24 $ 1.09 Excluded from the calculation of diluted earnings (loss) per share is the impact of potential shares attributable to exercises or conversions into common stock under stock-based employee compensation plans that would have been antidilutive during the respective periods.

Investments

Investments	3 Months Ended
	Mar. 31, 2024
Investments [Abstract]
Investments	Investments The significant components of Net investment income are presented in the following table. Three months ended March 31 (In millions) 2024 2023 Fixed maturity securities $ 502 $ 470 Equity securities 22 12 Limited partnership investments 54 25 Mortgage loans 15 14 Short-term investments 28 15 Trading portfolio 1 3 Other 8 5 Gross investment income 630 544 Investment expense (21) (19) Net investment income $ 609 $ 525 Net investment income (loss) recognized due to the change in fair value of common stock held as of March 31, 2024 and 2023 $ 13 $ (1) Net investment gains (losses) are presented in the following table. Three months ended March 31 (In millions) 2024 2023 Net investment gains (losses): Fixed maturity securities: Gross gains $ 14 $ 35 Gross losses (46) (57) Net investment gains (losses) on fixed maturity securities (32) (22) Equity securities 11 (14) Short-term investments and other (1) 1 Net investment gains (losses) $ (22) $ (35) Net investment gains (losses) recognized due to the change in fair value of non-redeemable preferred stock held as of March 31, 2024 and 2023 $ 11 $ (2) The available-for-sale impairment losses (gains) recognized in earnings by asset type are presented in the following table. The table includes losses (gains) on securities with an intention to sell and changes in the allowance for credit losses on securities since acquisition date. Three months ended March 31 (In millions) 2024 2023 Fixed maturity securities available-for-sale: Corporate and other bonds $ 9 $ 8 Asset-backed 5 — Impairment losses (gains) recognized in earnings $ 14 $ 8 There were no losses recognized on mortgage loans during the three months ended March 31, 2024 or 2023. The following tables present a summary of fixed maturity securities. March 31, 2024 Cost or Gross Gross Allowance for Credit Losses Estimated (In millions) Fixed maturity securities available-for-sale: Corporate and other bonds $ 25,221 $ 485 $ 1,374 $ 3 $ 24,329 States, municipalities and political subdivisions 7,726 318 756 — 7,288 Asset-backed: Residential mortgage-backed 3,563 10 483 — 3,090 Commercial mortgage-backed 1,838 8 193 8 1,645 Other asset-backed 3,586 19 251 9 3,345 Total asset-backed 8,987 37 927 17 8,080 U.S. Treasury and obligations of government-sponsored enterprises 181 — 2 — 179 Foreign government 763 3 37 — 729 Total fixed maturity securities available-for-sale 42,878 843 3,096 20 40,605 Total fixed maturity securities trading — — — — — Total fixed maturity securities $ 42,878 $ 843 $ 3,096 $ 20 $ 40,605 December 31, 2023 Cost or Gross Gross Allowance for Credit Losses Estimated (In millions) Fixed maturity securities available-for-sale: Corporate and other bonds $ 25,020 $ 597 $ 1,345 $ 4 $ 24,268 States, municipalities and political subdivisions 7,713 382 703 — 7,392 Asset-backed: Residential mortgage-backed 3,411 16 425 — 3,002 Commercial mortgage-backed 1,862 7 230 8 1,631 Other asset-backed 3,515 13 256 4 3,268 Total asset-backed 8,788 36 911 12 7,901 U.S. Treasury and obligations of government-sponsored enterprises 152 1 2 — 151 Foreign government 741 6 34 — 713 Total fixed maturity securities available-for-sale 42,414 1,022 2,995 16 40,425 Total fixed maturity securities trading — — — — — Total fixed maturity securities $ 42,414 $ 1,022 $ 2,995 $ 16 $ 40,425 The following tables present the estimated fair value and gross unrealized losses of available-for-sale fixed maturity securities in a gross unrealized loss position for which an allowance for credit loss has not been recorded, by the length of time in which the securities have continuously been in that position. Less than 12 Months 12 Months or Longer Total March 31, 2024 Estimated Gross Estimated Gross Estimated Gross (In millions) Fixed maturity securities available-for-sale: Corporate and other bonds $ 2,578 $ 48 $ 13,459 $ 1,326 $ 16,037 $ 1,374 States, municipalities and political subdivisions 686 17 3,266 739 3,952 756 Asset-backed: Residential mortgage-backed 434 8 2,159 475 2,593 483 Commercial mortgage-backed 131 2 1,162 191 1,293 193 Other asset-backed 588 9 1,833 242 2,421 251 Total asset-backed 1,153 19 5,154 908 6,307 927 U.S. Treasury and obligations of government-sponsored enterprises 100 1 28 1 128 2 Foreign government 136 2 452 35 588 37 Total $ 4,653 $ 87 $ 22,359 $ 3,009 $ 27,012 $ 3,096 Less than 12 Months 12 Months or Longer Total December 31, 2023 Estimated Gross Estimated Gross Estimated Gross (In millions) Fixed maturity securities available-for-sale: Corporate and other bonds $ 1,943 $ 37 $ 13,406 $ 1,308 $ 15,349 $ 1,345 States, municipalities and political subdivisions 598 18 3,104 685 3,702 703 Asset-backed: Residential mortgage-backed 233 4 2,212 421 2,445 425 Commercial mortgage-backed 200 5 1,184 225 1,384 230 Other asset-backed 392 8 1,869 248 2,261 256 Total asset-backed 825 17 5,265 894 6,090 911 U.S. Treasury and obligations of government-sponsored enterprises 65 1 23 1 88 2 Foreign government 52 1 450 33 502 34 Total $ 3,483 $ 74 $ 22,248 $ 2,921 $ 25,731 $ 2,995 The following table presents the estimated fair value and gross unrealized losses of available-for-sale fixed maturity securities in a gross unrealized loss position for which an allowance for credit loss has not been recorded, by ratings distribution. March 31, 2024 December 31, 2023 (In millions) Estimated Fair Value Gross Unrealized Losses Estimated Fair Value Gross Unrealized Losses U.S. Government, Government agencies and Government-sponsored enterprises $ 2,426 $ 361 $ 2,273 $ 309 AAA 1,661 280 1,524 261 AA 4,109 690 3,817 658 A 6,324 570 5,652 517 BBB 11,672 1,083 11,523 1,095 Non-investment grade 820 112 942 155 Total $ 27,012 $ 3,096 $ 25,731 $ 2,995 Based on current facts and circumstances, the Company believes the unrealized losses presented in the March 31, 2024 securities in a gross unrealized loss position tables above are not indicative of the ultimate collectability of the current amortized cost of the securities, but rather are primarily attributable to changes in risk-free interest rates. In reaching this determination, the Company considered the volatility in risk-free rates and credit spreads as well as the fact that its unrealized losses are concentrated in investment grade issuers. Additionally, the Company has no current intent to sell securities with unrealized losses, nor is it more likely than not that it will be required to sell prior to recovery of amortized cost; accordingly, the Company has determined that there are no additional impairment losses to be recorded as of March 31, 2024. The following tables present the activity related to the allowance on available-for-sale securities with credit impairments and purchased credit-deteriorated (PCD) assets. Accrued interest receivable on available-for-sale fixed maturity securities totaled $437 million, $435 million, and $407 million as of March 31, 2024, December 31, 2023, and March 31, 2023 and is excluded from the estimate of expected credit losses and the amortized cost basis in the table included within this Note. (In millions) Corporate and other bonds Asset-backed Total Allowance for credit losses: Balance as of January 1, 2024 $ 4 $ 12 $ 16 Additions to the allowance for credit losses: Securities for which credit losses were not previously recorded — — — Available-for-sale securities accounted for as PCD assets — — — Reductions to the allowance for credit losses: Securities sold during the period (realized) — — — Intent to sell or more likely than not will be required to sell the security before recovery of its amortized cost basis 1 — 1 Write-offs charged against the allowance — — — Recoveries of amounts previously written off — — — Additional increases or (decreases) to the allowance for credit losses on securities that had an allowance recorded in a previous period — 5 5 Balance as of March 31, 2024 $ 3 $ 17 $ 20 (In millions) Corporate and other bonds Asset-backed Total Allowance for credit losses: Balance as of January 1, 2023 $ — $ 1 $ 1 Additions to the allowance for credit losses: Securities for which credit losses were not previously recorded — — — Available-for-sale securities accounted for as PCD assets 9 — 9 Reductions to the allowance for credit losses: Securities sold during the period (realized) 6 — 6 Intent to sell or more likely than not will be required to sell the security before recovery of its amortized cost basis 3 — 3 Write-offs charged against the allowance — — — Recoveries of amounts previously written off — — — Additional increases or (decreases) to the allowance for credit losses on securities that had an allowance recorded in a previous period 1 — 1 Balance as of March 31, 2023 $ 1 $ 1 $ 2 Contractual Maturity The following table presents available-for-sale fixed maturity securities by contractual maturity. March 31, 2024 December 31, 2023 (In millions) Cost or Estimated Cost or Estimated Due in one year or less $ 1,238 $ 1,207 $ 1,121 $ 1,091 Due after one year through five years 11,680 11,308 11,563 11,180 Due after five years through ten years 13,283 12,461 13,359 12,573 Due after ten years 16,677 15,629 16,371 15,581 Total $ 42,878 $ 40,605 $ 42,414 $ 40,425 Actual maturities may differ from contractual maturities because certain securities may be called or prepaid. Securities not due at a single date are allocated based on weighted average life. Investment Commitments As part of its overall investment strategy, the Company invests in various assets which require future purchase, sale or funding commitments. These investments are recorded once funded, and the related commitments may include future capital calls from various third-party limited partnerships, signed and accepted mortgage loan applications, and obligations related to private placement securities. As of March 31, 2024, the Company had commitments to purchase or fund approximately $1,570 million and sell approximately $25 million under the terms of these investments. Mortgage Loans The following table presents the amortized cost basis of mortgage loans for each credit quality indicator by year of origination. The primary credit quality indicators utilized are debt service coverage ratios (DSCR) and loan-to-value ratios (LTV). March 31, 2024 Mortgage Loans Amortized Cost Basis by Origination Year (1) (In millions) 2024 2023 2022 2021 2020 Prior Total DSCR ≥1.6x LTV less than 55% $ — $ 33 $ 9 $ 2 $ 97 $ 283 $ 424 LTV 55% to 65% — — — 5 — — 5 LTV greater than 65% — — 30 12 — — 42 DSCR 1.2x - 1.6x LTV less than 55% — 28 5 — 13 63 109 LTV 55% to 65% 12 21 36 36 24 31 160 LTV greater than 65% — 12 65 — — — 77 DSCR ≤1.2 LTV less than 55% — — — — — — — LTV 55% to 65% — 32 75 — — 43 150 LTV greater than 65% — — 28 21 — 48 97 Total $ 12 $ 126 $ 248 $ 76 $ 134 $ 468 $ 1,064 (1) The values in the table above reflect DSCR on a standardized amortization period and LTV based on the most recent appraised values trended forward using changes in a commercial real estate price index. As of March 31, 2024, accrued interest receivable on mortgage loans totaled $4 million and is excluded from the amortized cost basis disclosed in the table above and the estimate of expected credit losses.

Fair Value

Fair Value	3 Months Ended
	Mar. 31, 2024
Fair Value Disclosures [Abstract]
Fair Value	Fair Value Fair value is the price that would be received upon sale of an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date. The following fair value hierarchy is used in selecting inputs, with the highest priority given to Level 1, as these are the most transparent or reliable. Level 1 - Quoted prices for identical instruments in active markets. Level 2 - Quoted prices for similar instruments in active markets; quoted prices for identical or similar instruments in markets that are not active; and model-derived valuations in which all significant inputs are observable in active markets. Level 3 - Valuations derived from valuation techniques in which one or more significant inputs are not observable. Prices may fall within Level 1, 2 or 3 depending upon the methodology and inputs used to estimate fair value for each specific security. In general, the Company seeks to price securities using third-party pricing services. Securities not priced by pricing services are submitted to independent brokers for valuation and, if those are not available, internally developed pricing models are used to value assets using a methodology and inputs the Company believes market participants would use to value the assets. Prices obtained from third-party pricing services or brokers are not adjusted by the Company. The Company performs control procedures over information obtained from pricing services and brokers to ensure prices received represent a reasonable estimate of fair value and to confirm representations regarding whether inputs are observable or unobservable. Procedures may include i) the review of pricing service methodologies or broker pricing qualifications, ii) back-testing, where past fair value estimates are compared to actual transactions executed in the market on similar dates, iii) exception reporting, where period-over-period changes in price are reviewed and challenged with the pricing service or broker based on exception criteria, and iv) deep dives, where the Company performs an independent analysis of the inputs and assumptions used to price individual securities. Assets and Liabilities Measured at Fair Value Assets and liabilities measured at fair value on a recurring basis are presented in the following tables. Corporate bonds and other includes obligations of the United States of America (U.S.) Treasury, government-sponsored enterprises, foreign governments and redeemable preferred stock. March 31, 2024 Total (In millions) Level 1 Level 2 Level 3 Assets Fixed maturity securities: Corporate bonds and other $ 189 $ 23,966 $ 1,082 $ 25,237 States, municipalities and political subdivisions — 7,245 43 7,288 Asset-backed — 7,209 871 8,080 Total fixed maturity securities 189 38,420 1,996 40,605 Equity securities: Common stock 195 — 11 206 Non-redeemable preferred stock 46 439 — 485 Total equity securities 241 439 11 691 Short term and other 1,801 19 — 1,820 Total assets $ 2,231 $ 38,878 $ 2,007 $ 43,116 Liabilities Other liabilities $ — $ — $ — $ — Total liabilities $ — $ — $ — $ — December 31, 2023 Total (In millions) Level 1 Level 2 Level 3 Assets Fixed maturity securities: Corporate bonds and other $ 161 $ 23,926 $ 1,045 $ 25,132 States, municipalities and political subdivisions — 7,348 44 7,392 Asset-backed — 7,000 901 7,901 Total fixed maturity securities 161 38,274 1,990 40,425 Equity securities: Common stock 167 — 24 191 Non-redeemable preferred stock 52 440 — 492 Total equity securities 219 440 24 683 Short term and other 1,976 32 — 2,008 Total assets $ 2,356 $ 38,746 $ 2,014 $ 43,116 Liabilities Other liabilities $ — $ 1 $ — $ 1 Total liabilities $ — $ 1 $ — $ 1 The tables below present a reconciliation for all assets and liabilities measured at fair value on a recurring basis using significant unobservable inputs (Level 3). Level 3 (In millions) Corporate bonds and other States, municipalities and political subdivisions Asset-backed Equity securities Total Balance as of January 1, 2024 $ 1,045 $ 44 $ 901 $ 24 $ 2,014 Total realized and unrealized investment gains (losses): Reported in Net investment gains (losses) — — (4) — (4) Reported in Net investment income — — 6 6 12 Reported in Other comprehensive income (loss) (12) (1) (5) — (18) Total realized and unrealized investment gains (losses) (12) (1) (3) 6 (10) Purchases 74 — 18 — 92 Sales — — (9) (19) (28) Settlements (36) — (17) — (53) Transfers into Level 3 11 — — — 11 Transfers out of Level 3 — — (19) — (19) Balance as of March 31, 2024 $ 1,082 $ 43 $ 871 $ 11 $ 2,007 Unrealized gains (losses) on Level 3 assets and liabilities held as of March 31, 2024 recognized in Net income (loss) in the period $ — $ — $ — $ 1 $ 1 Unrealized gains (losses) on Level 3 assets and liabilities held as of March 31, 2024 recognized in Other comprehensive income (loss) in the period (14) (1) (5) — (20) Level 3 (In millions) Corporate bonds and other States, municipalities and political subdivisions Asset-backed Equity securities Total Balance as of January 1, 2023 $ 810 $ 43 $ 788 $ 35 $ 1,676 Total realized and unrealized investment gains (losses): Reported in Net investment gains (losses) — — — — — Reported in Net investment income — — 5 (6) (1) Reported in Other comprehensive income (loss) 24 1 7 — 32 Total realized and unrealized investment gains (losses) 24 1 12 (6) 31 Purchases 81 — 55 — 136 Sales — — — — — Settlements (3) — (9) — (12) Transfers into Level 3 — — 23 — 23 Transfers out of Level 3 — — (10) — (10) Balance as of March 31, 2023 $ 912 $ 44 $ 859 $ 29 $ 1,844 Unrealized gains (losses) on Level 3 assets and liabilities held as of March 31, 2023 recognized in Net income (loss) in the period $ — $ — $ — $ (6) $ (6) Unrealized gains (losses) on Level 3 assets and liabilities held as of March 31, 2023 recognized in Other comprehensive income (loss) in the period 24 1 7 — 32 Valuation Methodologies and Inputs The following section describes the valuation methodologies and relevant inputs used to measure different financial instruments at fair value, including an indication of the level in the fair value hierarchy in which the instruments are generally classified. Fixed Maturity Securities Level 1 securities include highly liquid government securities and exchange traded bonds, valued using quoted market prices. Level 2 securities include most other fixed maturity securities as the significant inputs are observable in the marketplace. All classes of Level 2 fixed maturity securities are valued using a methodology based on information generated by market transactions involving identical or comparable assets, a discounted cash flow methodology, or a combination of both when necessary. Common inputs for all classes of fixed maturity securities include prices from recently executed transactions of similar securities, marketplace quotes, benchmark yields, spreads off benchmark yields, interest rates and U.S. Treasury or swap curves. Specifically for asset-backed securities, key inputs include prepayment and default projections based on past performance of the underlying collateral and current market data. Fixed maturity securities are primarily assigned to Level 3 in cases where broker/dealer quotes are significant inputs to the valuation and there is a lack of transparency as to whether these quotes are based on information that is observable in the marketplace. Level 3 securities also include private placement debt securities whose fair value is determined using internal models with some inputs that are not market observable. Equity Securities Level 1 equity securities include publicly traded securities valued using quoted market prices. Level 2 securities are primarily valued using pricing for similar securities, recently executed transactions and other pricing models utilizing market observable inputs. Level 3 securities are primarily priced using broker/dealer quotes and internal models with some inputs that are not market observable. Short Term and Other Invested Assets Securities that are actively traded or have quoted prices are classified as Level 1. These securities include money market funds and treasury bills. Level 2 primarily includes non-U.S. government securities for which all inputs are market observable. Fixed maturity securities purchased within one year of maturity are classified consistent with fixed maturity securities discussed above. Short-term investments as presented in the tables above differ from the amounts presented on the Condensed Consolidated Balance Sheets because certain short-term investments, such as time deposits, are not measured at fair value. As of March 31, 2024 and December 31, 2023, there were $73 million and $75 million of overseas deposits within Other invested assets, which can be redeemed at net asset value in 90 days or less. Overseas deposits are excluded from the fair value hierarchy because their fair value is recorded using the net asset value per share (or equivalent) practical expedient. Other Liabilities Level 2 securities include currency forward contracts valued using observable market forward rates. Significant Unobservable Inputs The following tables present quantitative information about the significant unobservable inputs utilized by the Company in the fair value measurements of Level 3 assets. Valuations for assets and liabilities not presented in the tables below are primarily based on broker/dealer quotes for which there is a lack of transparency as to inputs used to develop the valuations. The quantitative detail of these unobservable inputs is neither provided nor reasonably available to the Company. The weighted average rate is calculated based on fair value. March 31, 2024 Estimated Fair Value Valuation Technique(s) Unobservable Input(s) Range Fixed maturity securities $ 1,521 Discounted cash flow Credit spread 1% - 7% (2%) December 31, 2023 Estimated Fair Value Valuation Technique(s) Unobservable Input(s) Range Fixed maturity securities $ 1,495 Discounted cash flow Credit spread 1% - 7% (2%) For fixed maturity securities, an increase to the credit spread assumptions would result in a lower fair value measurement. Financial Assets and Liabilities Not Measured at Fair Value The carrying amount and estimated fair value of the Company's financial assets and liabilities which are not measured at fair value on the Condensed Consolidated Balance Sheets are presented in the following tables. March 31, 2024 Carrying Estimated Fair Value (In millions) Level 1 Level 2 Level 3 Total Assets Mortgage loans $ 1,029 $ — $ — $ 987 $ 987 Liabilities Short-term debt $ 550 $ — $ 549 $ — $ 549 Long-term debt 2,970 — 2,852 — 2,852 December 31, 2023 Carrying Estimated Fair Value (In millions) Level 1 Level 2 Level 3 Total Assets Mortgage loans $ 1,035 $ — $ — $ 997 $ 997 Liabilities Short-term debt $ 550 $ — $ 546 $ — $ 546 Long-term debt 2,481 — 2,385 — 2,385 The carrying amounts reported on the Condensed Consolidated Balance Sheets for Cash, Short-term investments not carried at fair value, Accrued investment income and certain Other assets and Other liabilities approximate fair value due to the short term nature of these items. These assets and liabilities are not listed in the tables above.

Claim and Claim Adjustment Expe

Claim and Claim Adjustment Expense Reserves	3 Months Ended
	Mar. 31, 2024
Liability for Claims and Claims Adjustment Expense [Abstract]
Claim and Claim Adjustment Expense Reserve	Claim and Claim Adjustment Expense Reserves Claim and claim adjustment expense reserves represent the estimated amounts necessary to resolve all outstanding claims, including incurred but not reported (IBNR) claims as of the reporting date. The Company's reserve projections are based primarily on detailed analysis of the facts in each case, the Company's experience with similar cases and various historical development patterns. Consideration is given to historical patterns such as claim reserving trends and settlement practices, loss payments, pending levels of unpaid claims and product mix, economic, medical and social inflation, and public attitudes. All of these factors can affect the estimation of claim and claim adjustment expense reserves. Establishing claim and claim adjustment expense reserves, including claim and claim adjustment expense reserves for catastrophic events that have occurred, is an estimation process. Many factors can ultimately affect the final settlement of a claim and, therefore, the necessary reserve. Changes in the law, results of litigation, medical costs, the cost of repair materials and labor rates can affect ultimate claim costs. In addition, time can be a critical part of reserving determinations since the longer the span between the incidence of a loss and the payment or settlement of the claim, the more variable the ultimate settlement amount can be. Accordingly, short-tail claims, such as property damage claims, tend to be more reasonably estimable than long-tail claims, such as workers' compensation, general liability and professional liability claims. Claim and claim adjustment expense reserves are also maintained for the Company's structured settlement obligations. In developing the claim and claim adjustment expense reserve estimates for structured settlement obligations, the Company's actuaries review mortality experience on an annual basis. Adjustments to prior year reserve estimates, if necessary, are reflected in the results of operations in the period that the need for such adjustments is determined. There can be no assurance that the Company's ultimate cost for insurance losses will not exceed current estimates. Catastrophes are an inherent risk of the property and casualty insurance business and have contributed to material period-to-period fluctuations in our results of operations and/or equity. The Company reported catastrophe losses, net of reinsurance, of $88 million and $52 million for the three months ended March 31, 2024 and 2023 primarily related to severe weather related events. Liability for Unpaid Claim and Claim Adjustment Expenses The following table presents a reconciliation between beginning and ending claim and claim adjustment expense reserves. Three months ended March 31 (In millions) 2024 2023 Reserves, beginning of year: Gross $ 23,304 $ 22,120 Ceded 5,141 5,191 Net reserves, beginning of year 18,163 16,929 Net incurred claim and claim adjustment expenses: Provision for insured events of current year 1,502 1,326 Increase (decrease) in provision for insured events of prior years (6) 13 Amortization of discount 10 11 Total net incurred (1) 1,506 1,350 Net payments attributable to: Current year events (113) (72) Prior year events (1,168) (1,042) Total net payments (1,281) (1,114) Foreign currency translation adjustment and other (41) 35 Net reserves, end of period 18,347 17,200 Ceded reserves, end of period 5,241 5,209 Gross reserves, end of period $ 23,588 $ 22,409 (1) Total net incurred does not agree to Insurance claims and policyholders' benefits as reflected on the Condensed Consolidated Statements of Operations due to amounts related to retroactive reinsurance deferred gain accounting, uncollectible reinsurance, benefit expenses related to future policy benefits and policyholders' dividends, which are not reflected in the table above. Net Prior Year Development Changes in estimates of claim and claim adjustment expense reserves, net of reinsurance, for prior years are defined as net prior year loss reserve development (development). These changes can be favorable or unfavorable. The following table presents development recorded for the Specialty, Commercial, International and Corporate & Other segments. Three months ended March 31 (In millions) 2024 2023 Pretax (favorable) unfavorable development: Specialty $ (5) $ — Commercial (2) (2) International — 15 Corporate & Other — — Total pretax (favorable) unfavorable development $ (7) $ 13 Specialty The following table presents further detail of the development recorded for the Specialty segment. Three months ended March 31 (In millions) 2024 2023 Pretax (favorable) unfavorable development: Medical Professional Liability $ — $ 9 Other Professional Liability and Management Liability — — Surety (18) — Warranty 13 (9) Other — — Total pretax (favorable) unfavorable development $ (5) $ — 2024 Favorable development in surety was primarily due to lower than expected frequency and lack of systemic activity in multiple accident years. Unfavorable development in warranty was primarily due to higher than expected frequency and severity in a recent accident year. Commercial The following table presents further detail of the development recorded for the Commercial segment. Three months ended March 31 (In millions) 2024 2023 Pretax (favorable) unfavorable development: Commercial Auto $ — $ — General Liability — — Workers' Compensation (2) (2) Property and Other — — Total pretax (favorable) unfavorable development $ (2) $ (2) International The following table presents further detail of the development recorded for the International segment. Three months ended March 31 (In millions) 2024 2023 Pretax (favorable) unfavorable development: Commercial $ — $ (2) Specialty — 19 Other — (2) Total pretax (favorable) unfavorable development $ — $ 15 2023 Unfavorable development in specialty was due to higher than expected large loss emergence in the Company's professional liability business in accident year 2017. Asbestos & Environmental Pollution (A&EP) Reserves In 2010, Continental Casualty Company (CCC) together with several of the Company’s insurance subsidiaries completed a transaction with National Indemnity Company (NICO), a subsidiary of Berkshire Hathaway Inc., under which substantially all of the Company’s legacy A&EP liabilities were ceded to NICO through a Loss Portfolio Transfer (LPT). At the effective date of the transaction, the Company ceded approximately $1.6 billion of net A&EP claim and allocated claim adjustment expense reserves to NICO under a retroactive reinsurance agreement with an aggregate limit of $4 billion. The $1.6 billion of claim and allocated claim adjustment expense reserves ceded to NICO was net of $1.2 billion of ceded claim and allocated claim adjustment expense reserves under existing third-party reinsurance contracts. The NICO LPT aggregate reinsurance limit also covers credit risk on the existing third-party reinsurance related to these liabilities. The Company paid NICO a reinsurance premium of $2 billion and transferred to NICO billed third-party reinsurance receivables related to A&EP claims with a net book value of $215 million, resulting in total consideration of $2.2 billion. In years subsequent to the effective date of the LPT, the Company recognized adverse prior year development on its A&EP reserves resulting in additional amounts ceded under the LPT. As a result, the cumulative amounts ceded under the LPT have exceeded the $2.2 billion consideration paid, resulting in the NICO LPT moving into a gain position, requiring retroactive reinsurance accounting. Under retroactive reinsurance accounting, this gain is deferred and only recognized in earnings in proportion to actual paid recoveries under the LPT. Over the life of the contract, there is no economic impact as long as any additional losses incurred are within the limit of the LPT. In a period in which the Company recognizes a change in the estimate of A&EP reserves that increases or decreases the amounts ceded under the LPT, the proportion of actual paid recoveries to total ceded losses is affected and the change in the deferred gain is recognized in earnings as if the revised estimate of ceded losses was available at the effective date of the LPT. The effect of the deferred retroactive reinsurance benefit is recorded in Insurance claims and policyholders' benefits in the Condensed Consolidated Statements of Operations. The impact of the LPT on the Condensed Consolidated Statements of Operations was the recognition of a retroactive reinsurance benefit of $12 million and $8 million for the three months ended March 31, 2024 and 2023. As of March 31, 2024 and December 31, 2023, the cumulative amounts ceded under the LPT were $3.6 billion. The unrecognized deferred retroactive reinsurance benefit was $405 million and $417 million as of March 31, 2024 and December 31, 2023 and is included within Other liabilities on the Condensed Consolidated Balance Sheets. NICO established a collateral trust account as security for its obligations to the Company. The fair value of the collateral trust account was $2.6 billion as of March 31, 2024. In addition, Berkshire Hathaway Inc. guaranteed the payment obligations of NICO up to the aggregate reinsurance limit as well as certain of NICO’s performance obligations under the trust agreement. NICO is responsible for claims handling and billing and collection from third-party reinsurers related to the majority of the Company’s A&EP claims. Credit Risk for Ceded Reserves The majority of the Company’s outstanding voluntary reinsurance receivables are due from reinsurers with financial strength ratings of A- or higher. Receivables due from reinsurers with lower financial strength ratings are primarily due from captive reinsurers and are backed by collateral arrangements.

Future Policy Benefit Reserves

Future Policy Benefit Reserves	3 Months Ended
	Mar. 31, 2024
Insurance [Abstract]
Future Policy Benefit Reserves	Future Policy Benefits Reserves Future policy benefits reserves are associated with the Company's run-off long-term care business, included in the Life & Group segment, and relate to policyholders that are currently receiving benefits, including claims that have been incurred but are not yet reported, as well as policyholders that are not yet receiving benefits. Future policy benefits reserves are comprised of the liability for future policyholder benefits (LFPB) which is reflected as Insurance reserves: Future policy benefits on the Condensed Consolidated Balance Sheet. The determination of Future policy benefits reserves requires management to make estimates and assumptions about expected policyholder experience over the remaining life of the policy. Since policies may be in force for several decades, these assumptions are subject to significant estimation risk. As a result of this variability, the Company’s future policy benefits reserves may be subject to material increases if actual experience develops adversely to the Company’s expectations. See Note A to the Consolidated Financial Statements within CNAF's Annual Report on Form 10-K for the year ended December 31, 2023 for further information on the long-term care reserving process. The following table summarizes balances and changes in the LFPB. (In millions) 2024 2023 Present value of future net premiums Balance, January 1 $ 3,710 $ 3,993 Effect of changes in discount rate (125) (74) Balance, January 1, at original locked in discount rate 3,585 3,919 Effect of changes in cash flow assumptions (1) — — Effect of actual variances from expected experience (1) (28) (49) Adjusted balance, January 1 3,557 3,870 Interest accrual 47 52 Net premiums: earned during period (107) (111) Balance, end of period at original locked in discount rate 3,497 3,811 Effect of changes in discount rate 56 154 Balance, March 31 $ 3,553 $ 3,965 Present value of future benefits & expenses Balance, January 1 $ 17,669 $ 17,472 Effect of changes in discount rate (578) (125) Balance, January 1, at original locked in discount rate 17,091 17,347 Effect of changes in cash flow assumptions (1) — — Effect of actual variances from expected experience (1) (13) (50) Adjusted balance, January 1 17,078 17,297 Interest accrual 231 242 Benefit & expense payments (321) (302) Balance, end of period at original locked in discount rate 16,988 17,237 Effect of changes in discount rate 78 704 Balance, March 31 $ 17,066 $ 17,941 Net LFPB $ 13,513 $ 13,976 (1) As of March 31, 2024 and 2023 the re-measurement gain (loss) of $(15) million and $1 million presented parenthetically on the Condensed Consolidated Statement of Operations is comprised of the effect of changes in cash flow assumptions and the effect of actual variances from expected experience. The following table presents earned premiums and interest expense associated with the Company’s long-term care business recognized on the Condensed Consolidated Statement of Operations. Periods ended March 31 Three Months (In millions) 2024 2023 Earned premiums $ 110 $ 115 Interest expense 184 190 The following table presents undiscounted expected future benefit and expense payments, and undiscounted expected future gross premiums. As of March 31 (In millions) 2024 2023 Expected future benefit and expense payments $ 32,474 $ 33,759 Expected future gross premiums 5,270 5,729 Discounted expected future gross premiums at the upper-medium grade fixed income instrument yield discount rate were $3,664 million and $4,046 million as of March 31, 2024 and 2023. The weighted average effective duration of the LFPB calculated using the original locked in discount rate was 11 years and 12 years as of March 31, 2024 and 2023. The weighted average interest rates in the table below are calculated based on the rate used to discount all future cash flows. As of March 31 As of December 31 2024 2023 2023 Original locked in discount rate 5.22 % 5.26 % 5.22 % Upper-medium grade fixed income instrument discount rate 5.20 4.92 4.94 For the three months ended March 31, 2024 and 2023, immediate charges to net income resulting from adverse development that caused the Net Premium Ratio (NPR) to exceed 100% for certain cohorts were $20 million and $13 million. For the three months ended March 31, 2024 and 2023, the portion of losses recognized in a prior period due to NPR exceeding 100% for certain cohorts which, due to favorable development, was reversed through net income was $2 million and $11 million.

Legal Proceedings, Contingencie

Legal Proceedings, Contingencies and Guarantees	3 Months Ended
	Mar. 31, 2024
Legal Proceedings, Commitments and Contingencies, and Guarantees [Abstract]
Legal Proceedings, Contingencies and Guarantees	Legal Proceedings, Contingencies and Guarantees The Company is a party to various claims and litigation incidental to its business, which, based on the facts and circumstances currently known, are not material to the Company's results of operations or financial position. Guarantees The Company has provided guarantees, if the primary obligor fails to perform, to holders of structured settlement annuities issued by a previously owned subsidiary. As of March 31, 2024, the potential amount of future payments the Company could be required to pay under these guarantees was approximately $1.5 billion, which will be paid over the lifetime of the annuitants. The Company does not believe any payment is likely under these guarantees, as the Company is the beneficiary of a trust that must be maintained at a level that approximates the discounted reserves for these annuities.

Benefit Plans

Benefit Plans	3 Months Ended
	Mar. 31, 2024
Retirement Benefits [Abstract]
Benefit Plans	Benefit Plans The components of net periodic pension cost (benefit) are presented in the following table. Three months ended March 31 (In millions) 2024 2023 Net periodic pension cost (benefit) Interest cost on projected benefit obligation $ 22 $ 25 Expected return on plan assets (29) (30) Amortization of net actuarial loss 7 8 Total net periodic pension cost (benefit) $ — $ 3 The following table indicates the line items in which the non-service cost (benefit) is presented in the Condensed Consolidated Statements of Operations. Three months ended March 31 (In millions) 2024 2023 Non-Service Cost (Benefit): Insurance claims and policyholder's benefits $ — $ 1 Other operating expenses — 2 Total net periodic pension cost (benefit) $ — $ 3

Accumulated Other Comprehensive

Accumulated Other Comprehensive Income (Loss) by Component	3 Months Ended
	Mar. 31, 2024
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Accumulated Other Comprehensive Income (Loss) by Component	Accumulated Other Comprehensive Income (Loss) by Component The tables below display the changes in Accumulated other comprehensive income (loss) by component. (In millions) Net unrealized gains (losses) on investments with an allowance for credit losses Net unrealized gains (losses) on other investments Pension and postretirement benefits Cumulative impact of changes in discount rates used to measure long duration contracts Cumulative foreign currency translation adjustment Total Balance as of January 1, 2024 $ (12) $ (1,613) $ (525) $ (359) $ (163) $ (2,672) Other comprehensive income (loss) before reclassifications (1) (239) — 341 (32) 69 Amounts reclassified from accumulated other comprehensive income (loss) net of tax (expense) benefit of $1, $6, $1, $—, $— and $8 (3) (22) (6) — — (31) Other comprehensive income (loss) net of tax (expense) benefit of $(1), $58, $(1), $(91), $— and $(35) 2 (217) 6 341 (32) 100 Balance as of March 31, 2024 $ (10) $ (1,830) $ (519) $ (18) $ (195) $ (2,572) (In millions) Net unrealized gains (losses) on investments with an allowance for credit losses Net unrealized gains (losses) on other investments Pension and postretirement benefits Cumulative impact of changes in discount rates used to measure long duration contracts Cumulative foreign currency translation adjustment Total Balance as of January 1, 2023, as previously reported $ (7) $ (2,738) $ (591) $ — $ (221) $ (3,557) Cumulative effect adjustment from changes in accounting guidance, net of tax (expense) benefit of $—, $—, $—, $11, $— and $11 — — — (41) — (41) Balance as of January 1, 2023 (7) (2738) (591) (41) (221) (3,598) Other comprehensive income (loss) before reclassifications (8) 652 — (396) 17 265 Amounts reclassified from accumulated other comprehensive income (loss) net of tax (expense) benefit of $—, $4, $2, $—, $— and $6 — (18) (7) — — (25) Other comprehensive income (loss) net of tax (expense) benefit of $2, $(180), $(2), $105, $— and $(75) (8) 670 7 (396) 17 290 Balance as of March 31, 2023 $ (15) $ (2,068) $ (584) $ (437) $ (204) $ (3,308) Amounts reclassified from Accumulated other comprehensive income (loss) shown above are reported in Net income (loss) as follows: Component of AOCI Condensed Consolidated Statements of Operations Line Item Affected by Reclassifications Net unrealized gains (losses) on investments with an allowance for credit losses and Net unrealized gains (losses) on other investments Net investment gains (losses) Pension and postretirement benefits Other operating expenses and Insurance claims and policyholders' benefits

Business Segments

Business Segments	3 Months Ended
	Mar. 31, 2024
Segment Reporting [Abstract]
Business Segments	Business Segments The Company's property and casualty commercial insurance operations are managed and reported in three business segments: Specialty, Commercial and International. These three segments are collectively referred to as Property & Casualty Operations. The Company's operations outside of Property & Casualty Operations are managed and reported in two segments: Life & Group and Corporate & Other. The accounting policies of the segments are the same as those described in Note A to the Consolidated Financial Statements within CNAF's Annual Report on Form 10-K for the year ended December 31, 2023. The Company manages most of its assets on a legal entity basis, while segment operations are generally conducted across legal entities. As such, only Insurance and Reinsurance receivables, Insurance reserves, Deferred acquisition costs, Goodwill and Deferred non-insurance warranty acquisition expense and revenue are readily identifiable for individual segments. Distinct investment portfolios are not maintained for every individual segment; accordingly, allocation of assets to each segment is not performed. Therefore, a significant portion of Net investment income and Net investment gains or losses are allocated primarily based on each segment's net carried insurance reserves, as adjusted. All significant intersegment income and expense have been eliminated. Income taxes have been allocated on the basis of the taxable income of the segments. In the following tables, certain financial measures are presented to provide information used by management to monitor the Company's operating performance. Management utilizes these financial measures to monitor the Company's insurance operations and investment portfolio. The performance of the Company's insurance operations is monitored by management through core income (loss), which is derived from certain income statement amounts. The Company's investment portfolio is monitored by management through analysis of various factors including unrealized gains and losses on securities, portfolio duration and exposure to market and credit risk. Core income (loss) is calculated by excluding from net income (loss) the after-tax effects of net investment gains or losses. The calculation of core income (loss) excludes net investment gains or losses because net investment gains or losses are generally driven by economic factors that are not necessarily reflective of our primary operations. The Company's results of operations and selected balance sheet items by segment are presented in the following tables. Three months ended March 31, 2024 Specialty Commercial International Life & Corporate (In millions) Eliminations Total Operating revenues Net earned premiums $ 814 $ 1,202 $ 315 $ 110 $ — $ — $ 2,441 Net investment income 150 176 31 231 21 — 609 Non-insurance warranty revenue 407 — — — — — 407 Other revenues 1 8 — — 3 (3) 9 Total operating revenues 1,372 1,386 346 341 24 (3) 3,466 Claims, benefits and expenses Net incurred claims and benefits 477 828 189 312 (8) — 1,798 Policyholders’ dividends 2 7 — — — — 9 Amortization of deferred acquisition costs 178 200 66 — — — 444 Non-insurance warranty expense 394 — — — — — 394 Other insurance related expenses 81 138 39 29 — — 287 Other expenses 15 12 2 — 59 (3) 85 Total claims, benefits and expenses 1,147 1,185 296 341 51 (3) 3,017 Core income (loss) before income tax 225 201 50 — (27) — 449 Income tax (expense) benefit on core income (loss) (48) (43) (13) 5 5 — (94) Core income (loss) $ 177 $ 158 $ 37 $ 5 $ (22) $ — 355 Net investment gains (losses) (22) Income tax (expense) benefit on net investment gains (losses) 5 Net investment gains (losses), after tax (17) Net income (loss) $ 338 March 31, 2024 (In millions) Reinsurance receivables $ 1,432 $ 1,279 $ 477 $ 92 $ 2,316 $ — $ 5,596 Insurance receivables 979 2,096 379 4 — — 3,458 Deferred acquisition costs 401 394 132 — — — 927 Goodwill 117 — 29 — — — 146 Deferred non-insurance warranty acquisition expense 3,621 — — — — — 3,621 Insurance reserves Claim and claim adjustment expenses 7,221 10,332 2,745 663 2,627 — 23,588 Unearned premiums 3,193 2,996 740 118 — (1) 7,046 Future policy benefits — — — 13,513 — — 13,513 Deferred non-insurance warranty revenue 4,645 — — — — — 4,645 Three months ended March 31, 2023 Specialty Commercial International Life & Corporate (In millions) Eliminations Total Operating revenues Net earned premiums $ 797 $ 1,046 $ 290 $ 115 $ — $ — $ 2,248 Net investment income 129 149 23 214 10 — 525 Non-insurance warranty revenue 407 — — — — — 407 Other revenues — 7 — — 3 (3) 7 Total operating revenues 1,333 1,202 313 329 13 (3) 3,187 Claims, benefits and expenses Net incurred claims and benefits 465 688 189 311 (7) — 1,646 Policyholders’ dividends 1 6 — — — — 7 Amortization of deferred acquisition costs 165 169 45 — — — 379 Non-insurance warranty expense 384 — — — — — 384 Other insurance related expenses 86 142 47 29 1 — 305 Other expenses 14 6 1 1 41 (3) 60 Total claims, benefits and expenses 1,115 1,011 282 341 35 (3) 2,781 Core income (loss) before income tax 218 191 31 (12) (22) — 406 Income tax (expense) benefit on core income (loss) (47) (40) (7) 9 4 — (81) Core income (loss) $ 171 $ 151 $ 24 $ (3) $ (18) $ — 325 Net investment gains (losses) (35) Income tax (expense) benefit on net investment gains (losses) 7 Net investment gains (losses), after tax (28) Net income (loss) $ 297 December 31, 2023 (In millions) Reinsurance receivables $ 1,281 $ 1,218 $ 468 $ 93 $ 2,374 $ — $ 5,434 Insurance receivables 1,053 2,024 388 5 — — 3,470 Deferred acquisition costs 392 371 133 — — — 896 Goodwill 117 — 29 — — — 146 Deferred non-insurance warranty acquisition expense 3,661 — — — — — 3,661 Insurance reserves Claim and claim adjustment expenses 7,131 10,103 2,709 675 2,686 — 23,304 Unearned premiums 3,227 2,858 749 99 — — 6,933 Future policy benefits — — — 13,959 — — 13,959 Deferred non-insurance warranty revenue 4,694 — — — — — 4,694 The following table presents operating revenues by line of business for each reportable segment. Three months ended March 31 (In millions) 2024 2023 Specialty Management & Professional Liability $ 729 $ 705 Surety 182 168 Warranty & Alternative Risks 461 460 Specialty revenues 1,372 1,333 Commercial Middle Market 432 398 Construction 455 385 Small Business 154 150 Other Commercial 345 269 Commercial revenues 1,386 1,202 International Canada 98 93 Europe 143 127 Hardy 105 93 International revenues 346 313 Life & Group revenues 341 329 Corporate & Other revenues 24 13 Eliminations (3) (3) Total operating revenues 3,466 3,187 Net investment gains (losses) (22) (35) Total revenues $ 3,444 $ 3,152

Non-Insurance Revenues from Con

Non-Insurance Revenues from Contracts with Customers	3 Months Ended
	Mar. 31, 2024
Revenue from Contract with Customer [Abstract]
Non-Insurance Revenues from Contracts with Customers	Non-Insurance Revenues from Contracts with Customers The Company had a deferred non-insurance warranty revenue balance of $4.6 billion and $4.7 billion reported under Liabilities as of March 31, 2024 and December 31, 2023. For the three months ended March 31, 2024 and 2023, the Company recognized $0.4 billion of revenues in each period that were included in the deferred revenue balance as of January 1, 2024 and 2023. For the three months ended March 31, 2024 and 2023, Non-insurance warranty revenue recognized from performance obligations related to prior periods due to a change in estimate was not material. The Company expects to recognize approximately $1.1 billion of the deferred revenue in the remainder of 2024, $1.1 billion in 2025, $0.9 billion in 2026 and $1.5 billion thereafter.

General (Policies)

General (Policies)	3 Months Ended
	Mar. 31, 2024
Accounting Policies [Abstract]
Basis of Presentation	The Condensed Consolidated Financial Statements include the accounts of CNA Financial Corporation (CNAF) and its subsidiaries. Collectively, CNAF and its subsidiaries are referred to as CNA or the Company. Loews Corporation (Loews) owned approximately 92% of the outstanding common stock of CNAF as of March 31, 2024.
Use of Estimates	The preparation of Condensed Consolidated Financial Statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and the disclosure of contingent assets and liabilities at the date of the Condensed Consolidated Financial Statements and the reported amounts of revenues and expenses during the reporting period. Actual results may differ from those estimates.The interim financial data as of March 31, 2024 and for the three months ended March 31, 2024 and 2023 is unaudited. However, in the opinion of management, the interim data includes all adjustments, including normal recurring adjustments, necessary for a fair statement of the Company's results for the interim periods in accordance with GAAP. The results of operations for the interim periods are not necessarily indicative of the results to be expected for the full year.
Accounting Standards Pending Adoption	In November 2023, the Financial Accounting Standards Board (FASB) issued Accounting Standards Update (ASU) No. 2023-07, Segment Reporting (Topic 280): Improvements to Reportable Segment Disclosures . The updated accounting guidance requires expanded reportable segment disclosures, primarily related to significant segment expenses which are regularly provided to the company’s Chief Operating Decision Maker. The guidance is effective for fiscal years beginning after December 15, 2023, and interim periods within annual periods beginning after December 15, 2024. Retrospective application is required. The Company is currently evaluating the effect the updated guidance will have on the Company's financial statement disclosures. In December 2023, the FASB issued ASU No. 2023-09, Income Taxes (Topic 740): Improvements to Income Tax Disclosures . The updated accounting guidance requires expanded income tax disclosures, including the disaggregation of existing disclosures related to the tax rate reconciliation and income taxes paid. The guidance is effective for annual periods beginning after December 15, 2024. Prospective application is required, with retrospective application permitted. The Company is currently evaluating the effect the updated guidance will have on the Company's financial statement disclosures.
Earnings (Loss) Per Share Data	Earnings (loss) per share is based on weighted average number of outstanding common shares. Basic earnings (loss) per share excludes the impact of dilutive securities and is computed by dividing Net income (loss) by the weighted average number of common shares outstanding for the period. Diluted earnings (loss) per share reflects the potential dilution that could occur if securities or other contracts to issue common stock were exercised or converted into common stock.
Future policy benefits reserves	Future policy benefits reserves are associated with the Company's run-off long-term care business, included in the Life & Group segment, and relate to policyholders that are currently receiving benefits, including claims that have been incurred but are not yet reported, as well as policyholders that are not yet receiving benefits. Future policy benefits reserves are comprised of the liability for future policyholder benefits (LFPB) which is reflected as Insurance reserves: Future policy benefits on the Condensed Consolidated Balance Sheet. The determination of Future policy benefits reserves requires management to make estimates and assumptions about expected policyholder experience over the remaining life of the policy. Since policies may be in force for several decades, these assumptions are subject to significant estimation risk. As a result of this variability, the Company’s future policy benefits reserves may be subject to material increases if actual experience develops adversely to the Company’s expectations. See Note A to the Consolidated Financial Statements within CNAF's Annual Report on Form 10-K for the year ended December 31, 2023 for further information on the long-term care reserving process.

Earnings (Loss) Per Share Data

Earnings (Loss) Per Share Data (Tables)	3 Months Ended
	Mar. 31, 2024
Earnings Per Share [Abstract]
Schedule of Earnings Per Share, Basic and Diluted	The following table presents the income and share data used in the basic and diluted earnings per share computations. Three months ended March 31 (In millions, except per share data) 2024 2023 Net income (loss) $ 338 $ 297 Common Stock and Common Stock Equivalents Basic Weighted average shares outstanding 271.6 271.3 Diluted Weighted average shares outstanding 271.6 271.3 Dilutive effect of stock-based awards under compensation plans 1.1 1.0 Total 272.7 272.3 Earnings (loss) per share Basic $ 1.24 $ 1.10 Diluted $ 1.24 $ 1.09

Investments (Tables)

Investments (Tables)	3 Months Ended
	Mar. 31, 2024
Investments [Abstract]
Net investment income	The significant components of Net investment income are presented in the following table. Three months ended March 31 (In millions) 2024 2023 Fixed maturity securities $ 502 $ 470 Equity securities 22 12 Limited partnership investments 54 25 Mortgage loans 15 14 Short-term investments 28 15 Trading portfolio 1 3 Other 8 5 Gross investment income 630 544 Investment expense (21) (19) Net investment income $ 609 $ 525 Net investment income (loss) recognized due to the change in fair value of common stock held as of March 31, 2024 and 2023 $ 13 $ (1)
Net realized investment gains (losses)	Net investment gains (losses) are presented in the following table. Three months ended March 31 (In millions) 2024 2023 Net investment gains (losses): Fixed maturity securities: Gross gains $ 14 $ 35 Gross losses (46) (57) Net investment gains (losses) on fixed maturity securities (32) (22) Equity securities 11 (14) Short-term investments and other (1) 1 Net investment gains (losses) $ (22) $ (35) Net investment gains (losses) recognized due to the change in fair value of non-redeemable preferred stock held as of March 31, 2024 and 2023 $ 11 $ (2)
Components of net other than temporary impairment losses recognized in earnings by asset type	The table includes losses (gains) on securities with an intention to sell and changes in the allowance for credit losses on securities since acquisition date. Three months ended March 31 (In millions) 2024 2023 Fixed maturity securities available-for-sale: Corporate and other bonds $ 9 $ 8 Asset-backed 5 — Impairment losses (gains) recognized in earnings $ 14 $ 8
Summary of fixed maturity securities	The following tables present a summary of fixed maturity securities. March 31, 2024 Cost or Gross Gross Allowance for Credit Losses Estimated (In millions) Fixed maturity securities available-for-sale: Corporate and other bonds $ 25,221 $ 485 $ 1,374 $ 3 $ 24,329 States, municipalities and political subdivisions 7,726 318 756 — 7,288 Asset-backed: Residential mortgage-backed 3,563 10 483 — 3,090 Commercial mortgage-backed 1,838 8 193 8 1,645 Other asset-backed 3,586 19 251 9 3,345 Total asset-backed 8,987 37 927 17 8,080 U.S. Treasury and obligations of government-sponsored enterprises 181 — 2 — 179 Foreign government 763 3 37 — 729 Total fixed maturity securities available-for-sale 42,878 843 3,096 20 40,605 Total fixed maturity securities trading — — — — — Total fixed maturity securities $ 42,878 $ 843 $ 3,096 $ 20 $ 40,605 December 31, 2023 Cost or Gross Gross Allowance for Credit Losses Estimated (In millions) Fixed maturity securities available-for-sale: Corporate and other bonds $ 25,020 $ 597 $ 1,345 $ 4 $ 24,268 States, municipalities and political subdivisions 7,713 382 703 — 7,392 Asset-backed: Residential mortgage-backed 3,411 16 425 — 3,002 Commercial mortgage-backed 1,862 7 230 8 1,631 Other asset-backed 3,515 13 256 4 3,268 Total asset-backed 8,788 36 911 12 7,901 U.S. Treasury and obligations of government-sponsored enterprises 152 1 2 — 151 Foreign government 741 6 34 — 713 Total fixed maturity securities available-for-sale 42,414 1,022 2,995 16 40,425 Total fixed maturity securities trading — — — — — Total fixed maturity securities $ 42,414 $ 1,022 $ 2,995 $ 16 $ 40,425
Debt securities, available-for-sale, unrealized loss position, fair value	The following tables present the estimated fair value and gross unrealized losses of available-for-sale fixed maturity securities in a gross unrealized loss position for which an allowance for credit loss has not been recorded, by the length of time in which the securities have continuously been in that position. Less than 12 Months 12 Months or Longer Total March 31, 2024 Estimated Gross Estimated Gross Estimated Gross (In millions) Fixed maturity securities available-for-sale: Corporate and other bonds $ 2,578 $ 48 $ 13,459 $ 1,326 $ 16,037 $ 1,374 States, municipalities and political subdivisions 686 17 3,266 739 3,952 756 Asset-backed: Residential mortgage-backed 434 8 2,159 475 2,593 483 Commercial mortgage-backed 131 2 1,162 191 1,293 193 Other asset-backed 588 9 1,833 242 2,421 251 Total asset-backed 1,153 19 5,154 908 6,307 927 U.S. Treasury and obligations of government-sponsored enterprises 100 1 28 1 128 2 Foreign government 136 2 452 35 588 37 Total $ 4,653 $ 87 $ 22,359 $ 3,009 $ 27,012 $ 3,096 Less than 12 Months 12 Months or Longer Total December 31, 2023 Estimated Gross Estimated Gross Estimated Gross (In millions) Fixed maturity securities available-for-sale: Corporate and other bonds $ 1,943 $ 37 $ 13,406 $ 1,308 $ 15,349 $ 1,345 States, municipalities and political subdivisions 598 18 3,104 685 3,702 703 Asset-backed: Residential mortgage-backed 233 4 2,212 421 2,445 425 Commercial mortgage-backed 200 5 1,184 225 1,384 230 Other asset-backed 392 8 1,869 248 2,261 256 Total asset-backed 825 17 5,265 894 6,090 911 U.S. Treasury and obligations of government-sponsored enterprises 65 1 23 1 88 2 Foreign government 52 1 450 33 502 34 Total $ 3,483 $ 74 $ 22,248 $ 2,921 $ 25,731 $ 2,995 The following table presents the estimated fair value and gross unrealized losses of available-for-sale fixed maturity securities in a gross unrealized loss position for which an allowance for credit loss has not been recorded, by ratings distribution. March 31, 2024 December 31, 2023 (In millions) Estimated Fair Value Gross Unrealized Losses Estimated Fair Value Gross Unrealized Losses U.S. Government, Government agencies and Government-sponsored enterprises $ 2,426 $ 361 $ 2,273 $ 309 AAA 1,661 280 1,524 261 AA 4,109 690 3,817 658 A 6,324 570 5,652 517 BBB 11,672 1,083 11,523 1,095 Non-investment grade 820 112 942 155 Total $ 27,012 $ 3,096 $ 25,731 $ 2,995
Debt securities, available-for-sale, allowance for credit loss	The following tables present the activity related to the allowance on available-for-sale securities with credit impairments and purchased credit-deteriorated (PCD) assets. Accrued interest receivable on available-for-sale fixed maturity securities totaled $437 million, $435 million, and $407 million as of March 31, 2024, December 31, 2023, and March 31, 2023 and is excluded from the estimate of expected credit losses and the amortized cost basis in the table included within this Note. (In millions) Corporate and other bonds Asset-backed Total Allowance for credit losses: Balance as of January 1, 2024 $ 4 $ 12 $ 16 Additions to the allowance for credit losses: Securities for which credit losses were not previously recorded — — — Available-for-sale securities accounted for as PCD assets — — — Reductions to the allowance for credit losses: Securities sold during the period (realized) — — — Intent to sell or more likely than not will be required to sell the security before recovery of its amortized cost basis 1 — 1 Write-offs charged against the allowance — — — Recoveries of amounts previously written off — — — Additional increases or (decreases) to the allowance for credit losses on securities that had an allowance recorded in a previous period — 5 5 Balance as of March 31, 2024 $ 3 $ 17 $ 20 (In millions) Corporate and other bonds Asset-backed Total Allowance for credit losses: Balance as of January 1, 2023 $ — $ 1 $ 1 Additions to the allowance for credit losses: Securities for which credit losses were not previously recorded — — — Available-for-sale securities accounted for as PCD assets 9 — 9 Reductions to the allowance for credit losses: Securities sold during the period (realized) 6 — 6 Intent to sell or more likely than not will be required to sell the security before recovery of its amortized cost basis 3 — 3 Write-offs charged against the allowance — — — Recoveries of amounts previously written off — — — Additional increases or (decreases) to the allowance for credit losses on securities that had an allowance recorded in a previous period 1 — 1 Balance as of March 31, 2023 $ 1 $ 1 $ 2
Contractual maturity	The following table presents available-for-sale fixed maturity securities by contractual maturity. March 31, 2024 December 31, 2023 (In millions) Cost or Estimated Cost or Estimated Due in one year or less $ 1,238 $ 1,207 $ 1,121 $ 1,091 Due after one year through five years 11,680 11,308 11,563 11,180 Due after five years through ten years 13,283 12,461 13,359 12,573 Due after ten years 16,677 15,629 16,371 15,581 Total $ 42,878 $ 40,605 $ 42,414 $ 40,425
Financing receivable credit quality indicators	The following table presents the amortized cost basis of mortgage loans for each credit quality indicator by year of origination. The primary credit quality indicators utilized are debt service coverage ratios (DSCR) and loan-to-value ratios (LTV). March 31, 2024 Mortgage Loans Amortized Cost Basis by Origination Year (1) (In millions) 2024 2023 2022 2021 2020 Prior Total DSCR ≥1.6x LTV less than 55% $ — $ 33 $ 9 $ 2 $ 97 $ 283 $ 424 LTV 55% to 65% — — — 5 — — 5 LTV greater than 65% — — 30 12 — — 42 DSCR 1.2x - 1.6x LTV less than 55% — 28 5 — 13 63 109 LTV 55% to 65% 12 21 36 36 24 31 160 LTV greater than 65% — 12 65 — — — 77 DSCR ≤1.2 LTV less than 55% — — — — — — — LTV 55% to 65% — 32 75 — — 43 150 LTV greater than 65% — — 28 21 — 48 97 Total $ 12 $ 126 $ 248 $ 76 $ 134 $ 468 $ 1,064 (1) The values in the table above reflect DSCR on a standardized amortization period and LTV based on the most recent appraised values trended forward using changes in a commercial real estate price index.

Fair Value (Tables)

Fair Value (Tables)	3 Months Ended
	Mar. 31, 2024
Fair Value Disclosures [Abstract]
Assets and liabilities measured at fair value on a recurring basis	Assets and liabilities measured at fair value on a recurring basis are presented in the following tables. Corporate bonds and other includes obligations of the United States of America (U.S.) Treasury, government-sponsored enterprises, foreign governments and redeemable preferred stock. March 31, 2024 Total (In millions) Level 1 Level 2 Level 3 Assets Fixed maturity securities: Corporate bonds and other $ 189 $ 23,966 $ 1,082 $ 25,237 States, municipalities and political subdivisions — 7,245 43 7,288 Asset-backed — 7,209 871 8,080 Total fixed maturity securities 189 38,420 1,996 40,605 Equity securities: Common stock 195 — 11 206 Non-redeemable preferred stock 46 439 — 485 Total equity securities 241 439 11 691 Short term and other 1,801 19 — 1,820 Total assets $ 2,231 $ 38,878 $ 2,007 $ 43,116 Liabilities Other liabilities $ — $ — $ — $ — Total liabilities $ — $ — $ — $ — December 31, 2023 Total (In millions) Level 1 Level 2 Level 3 Assets Fixed maturity securities: Corporate bonds and other $ 161 $ 23,926 $ 1,045 $ 25,132 States, municipalities and political subdivisions — 7,348 44 7,392 Asset-backed — 7,000 901 7,901 Total fixed maturity securities 161 38,274 1,990 40,425 Equity securities: Common stock 167 — 24 191 Non-redeemable preferred stock 52 440 — 492 Total equity securities 219 440 24 683 Short term and other 1,976 32 — 2,008 Total assets $ 2,356 $ 38,746 $ 2,014 $ 43,116 Liabilities Other liabilities $ — $ 1 $ — $ 1 Total liabilities $ — $ 1 $ — $ 1
Table of reconciliation for assets and liabilities measured at fair value on a recurring basis using significant unobservable inputs	The tables below present a reconciliation for all assets and liabilities measured at fair value on a recurring basis using significant unobservable inputs (Level 3). Level 3 (In millions) Corporate bonds and other States, municipalities and political subdivisions Asset-backed Equity securities Total Balance as of January 1, 2024 $ 1,045 $ 44 $ 901 $ 24 $ 2,014 Total realized and unrealized investment gains (losses): Reported in Net investment gains (losses) — — (4) — (4) Reported in Net investment income — — 6 6 12 Reported in Other comprehensive income (loss) (12) (1) (5) — (18) Total realized and unrealized investment gains (losses) (12) (1) (3) 6 (10) Purchases 74 — 18 — 92 Sales — — (9) (19) (28) Settlements (36) — (17) — (53) Transfers into Level 3 11 — — — 11 Transfers out of Level 3 — — (19) — (19) Balance as of March 31, 2024 $ 1,082 $ 43 $ 871 $ 11 $ 2,007 Unrealized gains (losses) on Level 3 assets and liabilities held as of March 31, 2024 recognized in Net income (loss) in the period $ — $ — $ — $ 1 $ 1 Unrealized gains (losses) on Level 3 assets and liabilities held as of March 31, 2024 recognized in Other comprehensive income (loss) in the period (14) (1) (5) — (20) Level 3 (In millions) Corporate bonds and other States, municipalities and political subdivisions Asset-backed Equity securities Total Balance as of January 1, 2023 $ 810 $ 43 $ 788 $ 35 $ 1,676 Total realized and unrealized investment gains (losses): Reported in Net investment gains (losses) — — — — — Reported in Net investment income — — 5 (6) (1) Reported in Other comprehensive income (loss) 24 1 7 — 32 Total realized and unrealized investment gains (losses) 24 1 12 (6) 31 Purchases 81 — 55 — 136 Sales — — — — — Settlements (3) — (9) — (12) Transfers into Level 3 — — 23 — 23 Transfers out of Level 3 — — (10) — (10) Balance as of March 31, 2023 $ 912 $ 44 $ 859 $ 29 $ 1,844 Unrealized gains (losses) on Level 3 assets and liabilities held as of March 31, 2023 recognized in Net income (loss) in the period $ — $ — $ — $ (6) $ (6) Unrealized gains (losses) on Level 3 assets and liabilities held as of March 31, 2023 recognized in Other comprehensive income (loss) in the period 24 1 7 — 32
Quantitative information about significant unobservable inputs in the fair value measurement of level 3 assets	The following tables present quantitative information about the significant unobservable inputs utilized by the Company in the fair value measurements of Level 3 assets. Valuations for assets and liabilities not presented in the tables below are primarily based on broker/dealer quotes for which there is a lack of transparency as to inputs used to develop the valuations. The quantitative detail of these unobservable inputs is neither provided nor reasonably available to the Company. The weighted average rate is calculated based on fair value. March 31, 2024 Estimated Fair Value Valuation Technique(s) Unobservable Input(s) Range Fixed maturity securities $ 1,521 Discounted cash flow Credit spread 1% - 7% (2%) December 31, 2023 Estimated Fair Value Valuation Technique(s) Unobservable Input(s) Range Fixed maturity securities $ 1,495 Discounted cash flow Credit spread 1% - 7% (2%)
Carrying amount and estimated fair value of financial instrument assets and liabilities not measured at fair value	The carrying amount and estimated fair value of the Company's financial assets and liabilities which are not measured at fair value on the Condensed Consolidated Balance Sheets are presented in the following tables. March 31, 2024 Carrying Estimated Fair Value (In millions) Level 1 Level 2 Level 3 Total Assets Mortgage loans $ 1,029 $ — $ — $ 987 $ 987 Liabilities Short-term debt $ 550 $ — $ 549 $ — $ 549 Long-term debt 2,970 — 2,852 — 2,852 December 31, 2023 Carrying Estimated Fair Value (In millions) Level 1 Level 2 Level 3 Total Assets Mortgage loans $ 1,035 $ — $ — $ 997 $ 997 Liabilities Short-term debt $ 550 $ — $ 546 $ — $ 546 Long-term debt 2,481 — 2,385 — 2,385

Claim and Claim Adjustment Ex_2

Claim and Claim Adjustment Expense Reserves (Tables)	3 Months Ended
	Mar. 31, 2024
Short-duration Insurance Contracts, Net Incurred Claim and Claim Adjustment Expenses [Line Items]
Schedule of liability for unpaid claims and claims adjustment expense	The following table presents a reconciliation between beginning and ending claim and claim adjustment expense reserves. Three months ended March 31 (In millions) 2024 2023 Reserves, beginning of year: Gross $ 23,304 $ 22,120 Ceded 5,141 5,191 Net reserves, beginning of year 18,163 16,929 Net incurred claim and claim adjustment expenses: Provision for insured events of current year 1,502 1,326 Increase (decrease) in provision for insured events of prior years (6) 13 Amortization of discount 10 11 Total net incurred (1) 1,506 1,350 Net payments attributable to: Current year events (113) (72) Prior year events (1,168) (1,042) Total net payments (1,281) (1,114) Foreign currency translation adjustment and other (41) 35 Net reserves, end of period 18,347 17,200 Ceded reserves, end of period 5,241 5,209 Gross reserves, end of period $ 23,588 $ 22,409 (1) Total net incurred does not agree to Insurance claims and policyholders' benefits as reflected on the Condensed Consolidated Statements of Operations due to amounts related to retroactive reinsurance deferred gain accounting, uncollectible reinsurance, benefit expenses related to future policy benefits and policyholders' dividends, which are not reflected in the table above.
Net prior year development	The following table presents development recorded for the Specialty, Commercial, International and Corporate & Other segments. Three months ended March 31 (In millions) 2024 2023 Pretax (favorable) unfavorable development: Specialty $ (5) $ — Commercial (2) (2) International — 15 Corporate & Other — — Total pretax (favorable) unfavorable development $ (7) $ 13
Net prior year claim and allocated claim adjustment expense reserve development	The following table presents further detail of the development recorded for the Specialty segment. Three months ended March 31 (In millions) 2024 2023 Pretax (favorable) unfavorable development: Medical Professional Liability $ — $ 9 Other Professional Liability and Management Liability — — Surety (18) — Warranty 13 (9) Other — — Total pretax (favorable) unfavorable development $ (5) $ — The following table presents further detail of the development recorded for the Commercial segment. Three months ended March 31 (In millions) 2024 2023 Pretax (favorable) unfavorable development: Commercial Auto $ — $ — General Liability — — Workers' Compensation (2) (2) Property and Other — — Total pretax (favorable) unfavorable development $ (2) $ (2) The following table presents further detail of the development recorded for the International segment. Three months ended March 31 (In millions) 2024 2023 Pretax (favorable) unfavorable development: Commercial $ — $ (2) Specialty — 19 Other — (2) Total pretax (favorable) unfavorable development $ — $ 15

Future Policy Benefit Reserves

Future Policy Benefit Reserves (Tables)	3 Months Ended
	Mar. 31, 2024
Insurance [Abstract]
Liability for Future Policy Benefit, Activity	The following table summarizes balances and changes in the LFPB. (In millions) 2024 2023 Present value of future net premiums Balance, January 1 $ 3,710 $ 3,993 Effect of changes in discount rate (125) (74) Balance, January 1, at original locked in discount rate 3,585 3,919 Effect of changes in cash flow assumptions (1) — — Effect of actual variances from expected experience (1) (28) (49) Adjusted balance, January 1 3,557 3,870 Interest accrual 47 52 Net premiums: earned during period (107) (111) Balance, end of period at original locked in discount rate 3,497 3,811 Effect of changes in discount rate 56 154 Balance, March 31 $ 3,553 $ 3,965 Present value of future benefits & expenses Balance, January 1 $ 17,669 $ 17,472 Effect of changes in discount rate (578) (125) Balance, January 1, at original locked in discount rate 17,091 17,347 Effect of changes in cash flow assumptions (1) — — Effect of actual variances from expected experience (1) (13) (50) Adjusted balance, January 1 17,078 17,297 Interest accrual 231 242 Benefit & expense payments (321) (302) Balance, end of period at original locked in discount rate 16,988 17,237 Effect of changes in discount rate 78 704 Balance, March 31 $ 17,066 $ 17,941 Net LFPB $ 13,513 $ 13,976 (1) As of March 31, 2024 and 2023 the re-measurement gain (loss) of $(15) million and $1 million presented parenthetically on the Condensed Consolidated Statement of Operations is comprised of the effect of changes in cash flow assumptions and the effect of actual variances from expected experience. The following table presents earned premiums and interest expense associated with the Company’s long-term care business recognized on the Condensed Consolidated Statement of Operations. Periods ended March 31 Three Months (In millions) 2024 2023 Earned premiums $ 110 $ 115 Interest expense 184 190 The following table presents undiscounted expected future benefit and expense payments, and undiscounted expected future gross premiums. As of March 31 (In millions) 2024 2023 Expected future benefit and expense payments $ 32,474 $ 33,759 Expected future gross premiums 5,270 5,729 The weighted average interest rates in the table below are calculated based on the rate used to discount all future cash flows. As of March 31 As of December 31 2024 2023 2023 Original locked in discount rate 5.22 % 5.26 % 5.22 % Upper-medium grade fixed income instrument discount rate 5.20 4.92 4.94

Benefit Plans (Tables)

Benefit Plans (Tables)	3 Months Ended
	Mar. 31, 2024
Retirement Benefits [Abstract]
Components of net periodic cost (benefit)	The components of net periodic pension cost (benefit) are presented in the following table. Three months ended March 31 (In millions) 2024 2023 Net periodic pension cost (benefit) Interest cost on projected benefit obligation $ 22 $ 25 Expected return on plan assets (29) (30) Amortization of net actuarial loss 7 8 Total net periodic pension cost (benefit) $ — $ 3 The following table indicates the line items in which the non-service cost (benefit) is presented in the Condensed Consolidated Statements of Operations. Three months ended March 31 (In millions) 2024 2023 Non-Service Cost (Benefit): Insurance claims and policyholder's benefits $ — $ 1 Other operating expenses — 2 Total net periodic pension cost (benefit) $ — $ 3

Accumulated Other Comprehensi_2

Accumulated Other Comprehensive Income (Loss) by Component (Tables)	3 Months Ended
	Mar. 31, 2024
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Accumulated Other Comprehensive Income (Loss) by Component	The tables below display the changes in Accumulated other comprehensive income (loss) by component. (In millions) Net unrealized gains (losses) on investments with an allowance for credit losses Net unrealized gains (losses) on other investments Pension and postretirement benefits Cumulative impact of changes in discount rates used to measure long duration contracts Cumulative foreign currency translation adjustment Total Balance as of January 1, 2024 $ (12) $ (1,613) $ (525) $ (359) $ (163) $ (2,672) Other comprehensive income (loss) before reclassifications (1) (239) — 341 (32) 69 Amounts reclassified from accumulated other comprehensive income (loss) net of tax (expense) benefit of $1, $6, $1, $—, $— and $8 (3) (22) (6) — — (31) Other comprehensive income (loss) net of tax (expense) benefit of $(1), $58, $(1), $(91), $— and $(35) 2 (217) 6 341 (32) 100 Balance as of March 31, 2024 $ (10) $ (1,830) $ (519) $ (18) $ (195) $ (2,572) (In millions) Net unrealized gains (losses) on investments with an allowance for credit losses Net unrealized gains (losses) on other investments Pension and postretirement benefits Cumulative impact of changes in discount rates used to measure long duration contracts Cumulative foreign currency translation adjustment Total Balance as of January 1, 2023, as previously reported $ (7) $ (2,738) $ (591) $ — $ (221) $ (3,557) Cumulative effect adjustment from changes in accounting guidance, net of tax (expense) benefit of $—, $—, $—, $11, $— and $11 — — — (41) — (41) Balance as of January 1, 2023 (7) (2738) (591) (41) (221) (3,598) Other comprehensive income (loss) before reclassifications (8) 652 — (396) 17 265 Amounts reclassified from accumulated other comprehensive income (loss) net of tax (expense) benefit of $—, $4, $2, $—, $— and $6 — (18) (7) — — (25) Other comprehensive income (loss) net of tax (expense) benefit of $2, $(180), $(2), $105, $— and $(75) (8) 670 7 (396) 17 290 Balance as of March 31, 2023 $ (15) $ (2,068) $ (584) $ (437) $ (204) $ (3,308)
Reclassification out of Accumulated Other Comprehensive Income	Amounts reclassified from Accumulated other comprehensive income (loss) shown above are reported in Net income (loss) as follows: Component of AOCI Condensed Consolidated Statements of Operations Line Item Affected by Reclassifications Net unrealized gains (losses) on investments with an allowance for credit losses and Net unrealized gains (losses) on other investments Net investment gains (losses) Pension and postretirement benefits Other operating expenses and Insurance claims and policyholders' benefits

Business Segments (Tables)

Business Segments (Tables)	3 Months Ended
	Mar. 31, 2024
Segment Reporting [Abstract]
Significant components of the Company's continuing operations and selected balance sheet items	The Company's results of operations and selected balance sheet items by segment are presented in the following tables. Three months ended March 31, 2024 Specialty Commercial International Life & Corporate (In millions) Eliminations Total Operating revenues Net earned premiums $ 814 $ 1,202 $ 315 $ 110 $ — $ — $ 2,441 Net investment income 150 176 31 231 21 — 609 Non-insurance warranty revenue 407 — — — — — 407 Other revenues 1 8 — — 3 (3) 9 Total operating revenues 1,372 1,386 346 341 24 (3) 3,466 Claims, benefits and expenses Net incurred claims and benefits 477 828 189 312 (8) — 1,798 Policyholders’ dividends 2 7 — — — — 9 Amortization of deferred acquisition costs 178 200 66 — — — 444 Non-insurance warranty expense 394 — — — — — 394 Other insurance related expenses 81 138 39 29 — — 287 Other expenses 15 12 2 — 59 (3) 85 Total claims, benefits and expenses 1,147 1,185 296 341 51 (3) 3,017 Core income (loss) before income tax 225 201 50 — (27) — 449 Income tax (expense) benefit on core income (loss) (48) (43) (13) 5 5 — (94) Core income (loss) $ 177 $ 158 $ 37 $ 5 $ (22) $ — 355 Net investment gains (losses) (22) Income tax (expense) benefit on net investment gains (losses) 5 Net investment gains (losses), after tax (17) Net income (loss) $ 338 March 31, 2024 (In millions) Reinsurance receivables $ 1,432 $ 1,279 $ 477 $ 92 $ 2,316 $ — $ 5,596 Insurance receivables 979 2,096 379 4 — — 3,458 Deferred acquisition costs 401 394 132 — — — 927 Goodwill 117 — 29 — — — 146 Deferred non-insurance warranty acquisition expense 3,621 — — — — — 3,621 Insurance reserves Claim and claim adjustment expenses 7,221 10,332 2,745 663 2,627 — 23,588 Unearned premiums 3,193 2,996 740 118 — (1) 7,046 Future policy benefits — — — 13,513 — — 13,513 Deferred non-insurance warranty revenue 4,645 — — — — — 4,645 Three months ended March 31, 2023 Specialty Commercial International Life & Corporate (In millions) Eliminations Total Operating revenues Net earned premiums $ 797 $ 1,046 $ 290 $ 115 $ — $ — $ 2,248 Net investment income 129 149 23 214 10 — 525 Non-insurance warranty revenue 407 — — — — — 407 Other revenues — 7 — — 3 (3) 7 Total operating revenues 1,333 1,202 313 329 13 (3) 3,187 Claims, benefits and expenses Net incurred claims and benefits 465 688 189 311 (7) — 1,646 Policyholders’ dividends 1 6 — — — — 7 Amortization of deferred acquisition costs 165 169 45 — — — 379 Non-insurance warranty expense 384 — — — — — 384 Other insurance related expenses 86 142 47 29 1 — 305 Other expenses 14 6 1 1 41 (3) 60 Total claims, benefits and expenses 1,115 1,011 282 341 35 (3) 2,781 Core income (loss) before income tax 218 191 31 (12) (22) — 406 Income tax (expense) benefit on core income (loss) (47) (40) (7) 9 4 — (81) Core income (loss) $ 171 $ 151 $ 24 $ (3) $ (18) $ — 325 Net investment gains (losses) (35) Income tax (expense) benefit on net investment gains (losses) 7 Net investment gains (losses), after tax (28) Net income (loss) $ 297 December 31, 2023 (In millions) Reinsurance receivables $ 1,281 $ 1,218 $ 468 $ 93 $ 2,374 $ — $ 5,434 Insurance receivables 1,053 2,024 388 5 — — 3,470 Deferred acquisition costs 392 371 133 — — — 896 Goodwill 117 — 29 — — — 146 Deferred non-insurance warranty acquisition expense 3,661 — — — — — 3,661 Insurance reserves Claim and claim adjustment expenses 7,131 10,103 2,709 675 2,686 — 23,304 Unearned premiums 3,227 2,858 749 99 — — 6,933 Future policy benefits — — — 13,959 — — 13,959 Deferred non-insurance warranty revenue 4,694 — — — — — 4,694
Revenues by line of business	The following table presents operating revenues by line of business for each reportable segment. Three months ended March 31 (In millions) 2024 2023 Specialty Management & Professional Liability $ 729 $ 705 Surety 182 168 Warranty & Alternative Risks 461 460 Specialty revenues 1,372 1,333 Commercial Middle Market 432 398 Construction 455 385 Small Business 154 150 Other Commercial 345 269 Commercial revenues 1,386 1,202 International Canada 98 93 Europe 143 127 Hardy 105 93 International revenues 346 313 Life & Group revenues 341 329 Corporate & Other revenues 24 13 Eliminations (3) (3) Total operating revenues 3,466 3,187 Net investment gains (losses) (22) (35) Total revenues $ 3,444 $ 3,152

General (Narrative) (Details)

General (Narrative) (Details)	Mar. 31, 2024
CNAF Consolidated | Loews
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Noncontrolling interest, ownership percentage by parent	92%

Earnings (Loss) Per Share Dat_2

Earnings (Loss) Per Share Data (Computations) (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Earnings Per Share [Abstract]
Net income	$ 338	$ 297
Basic
Weighted average shares outstanding (in shares)	271.6	271.3
Diluted
Weighted average shares outstanding (in shares)	271.6	271.3
Diluted effect of stock-based awards under compensation plans (in shares)	1.1	1
Total (in shares)	272.7	272.3
Earnings (loss) per share
Basic earnings (loss) per share (in usd per share)	$ 1.24	$ 1.10
Diluted earnings (loss) per share (in usd per share)	$ 1.24	$ 1.09

Earnings (Loss) Per Share Dat_3

Earnings (Loss) Per Share Data (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Earnings Per Share [Abstract]
Treasury stock, shares, acquired (in shares)	0	550,000
Purchase of treasury stock		$ 24

Investments (Net investment inc

Investments (Net investment income) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Net Investment Income [Line Items]
Gross investment income	$ 630	$ 544
Investment expense	(21)	(19)
Net investment income	609	525
Fixed maturity securities
Net Investment Income [Line Items]
Gross investment income	502	470
Equity securities
Net Investment Income [Line Items]
Gross investment income	22	12
Limited partnership investments
Net Investment Income [Line Items]
Gross investment income	54
Gross investment loss		25
Mortgage loans
Net Investment Income [Line Items]
Gross investment income	15	14
Short-term investments
Net Investment Income [Line Items]
Gross investment income	28	15
Trading portfolio
Net Investment Income [Line Items]
Gross investment income	1	3
Other
Net Investment Income [Line Items]
Gross investment income	8	5
Common Stock
Net Investment Income [Line Items]
Equity securities, FV-NI, gain (loss)	13	(1)
Non-redeemable preferred stock
Net Investment Income [Line Items]
Equity securities, FV-NI, gain (loss)	$ 11	$ (2)

Investments (Net realized inves

Investments (Net realized investment gains (losses)) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Fixed maturity securities:
Gross gains	$ 14	$ 35
Gross losses	(46)	(57)
Net investment gains (losses) on fixed maturity securities	(32)	(22)
Equity securities	11	(14)
Short-term investments and other	(1)	1
Net investment gains (losses)	$ (22)	$ (35)

Investments (Components of othe

Investments (Components of other-than-temporary impairment losses recognized in earnings) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Debt Securities, Available-for-sale [Line Items]
Impairment losses (gains) recognized in earnings	$ 14	$ 8
Corporate and other bonds
Debt Securities, Available-for-sale [Line Items]
Impairment losses (gains) recognized in earnings	9	8
Asset-backed
Debt Securities, Available-for-sale [Line Items]
Impairment losses (gains) recognized in earnings	$ 5	$ 0

Investments (Narrative) (Detail

Investments (Narrative) (Details) - USD ($)	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Dec. 31, 2023
Gain (Loss) on Securities [Line Items]
Mortgage loan losses due to changes in expected credit losses	$ 0	$ 0
Commitments to purchase or fund privately placed debt securities	1,570,000,000
Commitments to sell various privately placed debt securities	25,000,000
Mortgage loans
Gain (Loss) on Securities [Line Items]
Financing receivable, accrued interest, after allowance for credit loss	4,000,000
Fixed maturity securities
Gain (Loss) on Securities [Line Items]
Debt securities, available-for-sale, accrued interest, after allowance for credit loss	$ 437,000,000	$ 407,000,000	$ 435,000,000

Investments (Summary of fixed m

Investments (Summary of fixed maturity and equity securities) (Details) - USD ($) $ in Millions	Mar. 31, 2024	Dec. 31, 2023	Mar. 31, 2023	Dec. 31, 2022
Fixed maturity securities available-for-sale:
Cost or Amortized Cost	$ 42,878	$ 42,414
Gross Unrealized Gains	843	1,022
Gross Unrealized Losses	3,096	2,995
Allowance for Credit Losses	20	16	$ 2	$ 1
Estimated Fair Value	40,605	40,425
Debt Securities, Trading, Unrealized Gain (Loss) [Abstract]
Total fixed maturity securities trading	0	0
Total fixed maturity securities trading	0	0
Debt securities, amortized cost	42,878	42,414
Total fixed maturity securities	40,605	40,425
Corporate and other bonds
Fixed maturity securities available-for-sale:
Cost or Amortized Cost	25,221	25,020
Gross Unrealized Gains	485	597
Gross Unrealized Losses	1,374	1,345
Allowance for Credit Losses	3	4	1	0
Estimated Fair Value	24,329	24,268
Debt Securities, Trading, Unrealized Gain (Loss) [Abstract]
Total fixed maturity securities	25,237	25,132
States, municipalities and political subdivisions
Fixed maturity securities available-for-sale:
Cost or Amortized Cost	7,726	7,713
Gross Unrealized Gains	318	382
Gross Unrealized Losses	756	703
Allowance for Credit Losses	0	0
Estimated Fair Value	7,288	7,392
Debt Securities, Trading, Unrealized Gain (Loss) [Abstract]
Total fixed maturity securities	7,288	7,392
Residential mortgage-backed
Fixed maturity securities available-for-sale:
Cost or Amortized Cost	3,563	3,411
Gross Unrealized Gains	10	16
Gross Unrealized Losses	483	425
Allowance for Credit Losses	0	0
Estimated Fair Value	3,090	3,002
Commercial mortgage-backed
Fixed maturity securities available-for-sale:
Cost or Amortized Cost	1,838	1,862
Gross Unrealized Gains	8	7
Gross Unrealized Losses	193	230
Allowance for Credit Losses	8	8
Estimated Fair Value	1,645	1,631
Other asset-backed
Fixed maturity securities available-for-sale:
Cost or Amortized Cost	3,586	3,515
Gross Unrealized Gains	19	13
Gross Unrealized Losses	251	256
Allowance for Credit Losses	9	4
Estimated Fair Value	3,345	3,268
Asset-backed
Fixed maturity securities available-for-sale:
Cost or Amortized Cost	8,987	8,788
Gross Unrealized Gains	37	36
Gross Unrealized Losses	927	911
Allowance for Credit Losses	17	12	$ 1	$ 1
Estimated Fair Value	8,080	7,901
Debt Securities, Trading, Unrealized Gain (Loss) [Abstract]
Total fixed maturity securities	8,080	7,901
U.S. Treasury and obligations of government-sponsored enterprises
Fixed maturity securities available-for-sale:
Cost or Amortized Cost	181	152
Gross Unrealized Gains	0	1
Gross Unrealized Losses	2	2
Allowance for Credit Losses	0	0
Estimated Fair Value	179	151
Foreign government
Fixed maturity securities available-for-sale:
Cost or Amortized Cost	763	741
Gross Unrealized Gains	3	6
Gross Unrealized Losses	37	34
Allowance for Credit Losses	0	0
Estimated Fair Value	$ 729	$ 713

Investments (Securities in a gr

Investments (Securities in a gross unrealized loss position) (Details) - USD ($) $ in Millions	Mar. 31, 2024	Dec. 31, 2023
Debt Securities, Available-for-sale [Line Items]
Estimated Fair Value, Less than 12 months	$ 4,653	$ 3,483
Gross Unrealized Losses, Less than 12 Months	87	74
Estimated Fair Value, 12 Months or Longer	22,359	22,248
Gross Unrealized Losses, 12 Months or Longer	3,009	2,921
Estimated Fair Value, Total	27,012	25,731
Gross Unrealized Losses, Total	3,096	2,995
Corporate and other bonds
Debt Securities, Available-for-sale [Line Items]
Estimated Fair Value, Less than 12 months	2,578	1,943
Gross Unrealized Losses, Less than 12 Months	48	37
Estimated Fair Value, 12 Months or Longer	13,459	13,406
Gross Unrealized Losses, 12 Months or Longer	1,326	1,308
Estimated Fair Value, Total	16,037	15,349
Gross Unrealized Losses, Total	1,374	1,345
States, municipalities and political subdivisions
Debt Securities, Available-for-sale [Line Items]
Estimated Fair Value, Less than 12 months	686	598
Gross Unrealized Losses, Less than 12 Months	17	18
Estimated Fair Value, 12 Months or Longer	3,266	3,104
Gross Unrealized Losses, 12 Months or Longer	739	685
Estimated Fair Value, Total	3,952	3,702
Gross Unrealized Losses, Total	756	703
Residential mortgage-backed
Debt Securities, Available-for-sale [Line Items]
Estimated Fair Value, Less than 12 months	434	233
Gross Unrealized Losses, Less than 12 Months	8	4
Estimated Fair Value, 12 Months or Longer	2,159	2,212
Gross Unrealized Losses, 12 Months or Longer	475	421
Estimated Fair Value, Total	2,593	2,445
Gross Unrealized Losses, Total	483	425
Commercial mortgage-backed
Debt Securities, Available-for-sale [Line Items]
Estimated Fair Value, Less than 12 months	131	200
Gross Unrealized Losses, Less than 12 Months	2	5
Estimated Fair Value, 12 Months or Longer	1,162	1,184
Gross Unrealized Losses, 12 Months or Longer	191	225
Estimated Fair Value, Total	1,293	1,384
Gross Unrealized Losses, Total	193	230
Other asset-backed
Debt Securities, Available-for-sale [Line Items]
Estimated Fair Value, Less than 12 months	588	392
Gross Unrealized Losses, Less than 12 Months	9	8
Estimated Fair Value, 12 Months or Longer	1,833	1,869
Gross Unrealized Losses, 12 Months or Longer	242	248
Estimated Fair Value, Total	2,421	2,261
Gross Unrealized Losses, Total	251	256
Asset-backed
Debt Securities, Available-for-sale [Line Items]
Estimated Fair Value, Less than 12 months	1,153	825
Gross Unrealized Losses, Less than 12 Months	19	17
Estimated Fair Value, 12 Months or Longer	5,154	5,265
Gross Unrealized Losses, 12 Months or Longer	908	894
Estimated Fair Value, Total	6,307	6,090
Gross Unrealized Losses, Total	927	911
U.S. Treasury and obligations of government-sponsored enterprises
Debt Securities, Available-for-sale [Line Items]
Estimated Fair Value, Less than 12 months	100	65
Gross Unrealized Losses, Less than 12 Months	1	1
Estimated Fair Value, 12 Months or Longer	28	23
Gross Unrealized Losses, 12 Months or Longer	1	1
Estimated Fair Value, Total	128	88
Gross Unrealized Losses, Total	2	2
Foreign government
Debt Securities, Available-for-sale [Line Items]
Estimated Fair Value, Less than 12 months	136	52
Gross Unrealized Losses, Less than 12 Months	2	1
Estimated Fair Value, 12 Months or Longer	452	450
Gross Unrealized Losses, 12 Months or Longer	35	33
Estimated Fair Value, Total	588	502
Gross Unrealized Losses, Total	$ 37	$ 34

Investments (Securities in a _2

Investments (Securities in a gross unrealized loss position by ratings) (Details) - USD ($) $ in Millions	Mar. 31, 2024	Dec. 31, 2023
Debt Securities, Available-for-sale [Line Items]
Estimated Fair Value	$ 27,012	$ 25,731
Gross Unrealized Losses	3,096	2,995
U.S. Government, Government agencies and Government-sponsored enterprises
Debt Securities, Available-for-sale [Line Items]
Estimated Fair Value	2,426	2,273
Gross Unrealized Losses	361	309
AAA
Debt Securities, Available-for-sale [Line Items]
Estimated Fair Value	1,661	1,524
Gross Unrealized Losses	280	261
AA
Debt Securities, Available-for-sale [Line Items]
Estimated Fair Value	4,109	3,817
Gross Unrealized Losses	690	658
A
Debt Securities, Available-for-sale [Line Items]
Estimated Fair Value	6,324	5,652
Gross Unrealized Losses	570	517
BBB
Debt Securities, Available-for-sale [Line Items]
Estimated Fair Value	11,672	11,523
Gross Unrealized Losses	1,083	1,095
Non-investment grade
Debt Securities, Available-for-sale [Line Items]
Estimated Fair Value	820	942
Gross Unrealized Losses	$ 112	$ 155

Investments (Allowance on avail

Investments (Allowance on available-for-sale securities with credit impairments and PCD assets activity) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Allowance for credit losses:
Balance, beginning of period	$ 16	$ 1
Additions to the allowance for credit losses:
Securities for which credit losses were not previously recorded	0	0
Available-for-sale securities accounted for as PCD assets	0	9
Reductions to the allowance for credit losses:
Securities sold during the period (realized)	0	6
Intent to sell or more likely than not will be required to sell the security before recovery of its amortized cost basis	1	3
Write-offs charged against the allowance	0	0
Recoveries of amounts previously written off	0	0
Additional increases or (decreases) to the allowance for credit losses on securities that had an allowance recorded in a previous period	5	1
Balance, end of period	20	2
Corporate and other bonds
Allowance for credit losses:
Balance, beginning of period	4	0
Additions to the allowance for credit losses:
Securities for which credit losses were not previously recorded	0	0
Available-for-sale securities accounted for as PCD assets	0	9
Reductions to the allowance for credit losses:
Securities sold during the period (realized)	0	6
Intent to sell or more likely than not will be required to sell the security before recovery of its amortized cost basis	1	3
Write-offs charged against the allowance	0	0
Recoveries of amounts previously written off	0	0
Additional increases or (decreases) to the allowance for credit losses on securities that had an allowance recorded in a previous period	0	1
Balance, end of period	3	1
Asset-backed
Allowance for credit losses:
Balance, beginning of period	12	1
Additions to the allowance for credit losses:
Securities for which credit losses were not previously recorded	0	0
Available-for-sale securities accounted for as PCD assets	0	0
Reductions to the allowance for credit losses:
Securities sold during the period (realized)	0	0
Intent to sell or more likely than not will be required to sell the security before recovery of its amortized cost basis	0	0
Write-offs charged against the allowance	0	0
Recoveries of amounts previously written off	0	0
Additional increases or (decreases) to the allowance for credit losses on securities that had an allowance recorded in a previous period	5	0
Balance, end of period	$ 17	$ 1

Investments (Contractual maturi

Investments (Contractual maturity) (Details) - USD ($) $ in Millions	Mar. 31, 2024	Dec. 31, 2023
Investments [Abstract]
Due in one year or less, cost or amortized cost	$ 1,238	$ 1,121
Due after one year through five years, cost or amortized cost	11,680	11,563
Due after five years through ten years, cost or amortized cost	13,283	13,359
Due after ten years, cost or amortized cost	16,677	16,371
Cost or Amortized Cost	42,878	42,414
Due in one year or less, estimated fair value	1,207	1,091
Due after one year through five years, estimated fair value	11,308	11,180
Due after five years through ten years, estimated fair value	12,461	12,573
Due after ten years, estimated fair value	15,629	15,581
Estimated Fair Value	$ 40,605	$ 40,425

Investments (Credit quality ind

Investments (Credit quality indicator) (Details) - Mortgage loans $ in Millions	Mar. 31, 2024 USD ($)
Debt Securities, Available-for-sale [Line Items]
2024	$ 12
2023	126
2022	248
2021	76
2020	134
Prior	468
Total	1,064
DSCR ≥1.6x | LTV less than 55%
Debt Securities, Available-for-sale [Line Items]
2024	0
2023	33
2022	9
2021	2
2020	97
Prior	283
Total	424
DSCR ≥1.6x | LTV 55% to 65%
Debt Securities, Available-for-sale [Line Items]
2024	0
2023	0
2022	0
2021	5
2020	0
Prior	0
Total	5
DSCR ≥1.6x | LTV greater than 65%
Debt Securities, Available-for-sale [Line Items]
2024	0
2023	0
2022	30
2021	12
2020	0
Prior	0
Total	42
DSCR 1.2x - 1.6x | LTV less than 55%
Debt Securities, Available-for-sale [Line Items]
2024	0
2023	28
2022	5
2021	0
2020	13
Prior	63
Total	109
DSCR 1.2x - 1.6x | LTV 55% to 65%
Debt Securities, Available-for-sale [Line Items]
2024	12
2023	21
2022	36
2021	36
2020	24
Prior	31
Total	160
DSCR 1.2x - 1.6x | LTV greater than 65%
Debt Securities, Available-for-sale [Line Items]
2024	0
2023	12
2022	65
2021	0
2020	0
Prior	0
Total	77
DSCR ≤1.2 | LTV less than 55%
Debt Securities, Available-for-sale [Line Items]
2024	0
2023	0
2022	0
2021	0
2020	0
Prior	0
Total	0
DSCR ≤1.2 | LTV 55% to 65%
Debt Securities, Available-for-sale [Line Items]
2024	0
2023	32
2022	75
2021	0
2020	0
Prior	43
Total	150
DSCR ≤1.2 | LTV greater than 65%
Debt Securities, Available-for-sale [Line Items]
2024	0
2023	0
2022	28
2021	21
2020	0
Prior	48
Total	$ 97

Fair Value (Assets and liabilit

Fair Value (Assets and liabilities measured at fair value on a recurring basis) (Details) - USD ($) $ in Millions	Mar. 31, 2024	Dec. 31, 2023
Fixed maturity securities:
Fixed maturity securities	$ 40,605	$ 40,425
Equity securities:
Equity securities	691	683
Short term and other	1,820	2,008
Total assets	43,116	43,116
Other liabilities	0	1
Total liabilities	0	1
Corporate and other bonds
Fixed maturity securities:
Fixed maturity securities	25,237	25,132
States, municipalities and political subdivisions
Fixed maturity securities:
Fixed maturity securities	7,288	7,392
Asset-backed
Fixed maturity securities:
Fixed maturity securities	8,080	7,901
Common Stock
Equity securities:
Equity securities	206	191
Non-redeemable preferred stock
Equity securities:
Equity securities	485	492
Level 1
Fixed maturity securities:
Fixed maturity securities	189	161
Equity securities:
Equity securities	241	219
Short term and other	1,801	1,976
Total assets	2,231	2,356
Other liabilities	0	0
Total liabilities	0	0
Level 1 | Corporate and other bonds
Fixed maturity securities:
Fixed maturity securities	189	161
Level 1 | States, municipalities and political subdivisions
Fixed maturity securities:
Fixed maturity securities	0	0
Level 1 | Asset-backed
Fixed maturity securities:
Fixed maturity securities	0	0
Level 1 | Common Stock
Equity securities:
Equity securities	195	167
Level 1 | Non-redeemable preferred stock
Equity securities:
Equity securities	46	52
Level 2
Fixed maturity securities:
Fixed maturity securities	38,420	38,274
Equity securities:
Equity securities	439	440
Short term and other	19	32
Total assets	38,878	38,746
Other liabilities	0	1
Total liabilities	0	1
Level 2 | Corporate and other bonds
Fixed maturity securities:
Fixed maturity securities	23,966	23,926
Level 2 | States, municipalities and political subdivisions
Fixed maturity securities:
Fixed maturity securities	7,245	7,348
Level 2 | Asset-backed
Fixed maturity securities:
Fixed maturity securities	7,209	7,000
Level 2 | Common Stock
Equity securities:
Equity securities	0	0
Level 2 | Non-redeemable preferred stock
Equity securities:
Equity securities	439	440
Level 3
Fixed maturity securities:
Fixed maturity securities	1,996	1,990
Equity securities:
Equity securities	11	24
Short term and other	0	0
Total assets	2,007	2,014
Other liabilities	0	0
Total liabilities	0	0
Level 3 | Corporate and other bonds
Fixed maturity securities:
Fixed maturity securities	1,082	1,045
Level 3 | States, municipalities and political subdivisions
Fixed maturity securities:
Fixed maturity securities	43	44
Level 3 | Asset-backed
Fixed maturity securities:
Fixed maturity securities	871	901
Level 3 | Common Stock
Equity securities:
Equity securities	11	24
Level 3 | Non-redeemable preferred stock
Equity securities:
Equity securities	$ 0	$ 0

Fair Value (Table of reconcilia

Fair Value (Table of reconciliation for assets and liabilities measured at fair value on a recurring basis using significant unobservable inputs) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance, Beginning, Assets	$ 2,014	$ 1,676
Reported in Net investment gains (losses)	$ (4)	$ 0
Fair Value, Asset, Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration]	Net investment losses	Net investment losses
Fair Value, Asset, Recurring Basis, Unobservable Input Reconciliation, Asset, Gain (Loss), Statement of Other Comprehensive Income or Comprehensive Income [Extensible Enumeration]	Other comprehensive income	Other comprehensive income
Reported in Other comprehensive income (loss)	$ (18)	$ 32
Total realized and unrealized investment gains (losses)	(10)	31
Purchases	92	136
Sales	(28)	0
Settlements	(53)	(12)
Transfers into Level 3	11	23
Transfers out of Level 3	(19)	(10)
Balance, Ending, Assets	2,007	1,844
Unrealized gains (losses) on Level 3 assets and liabilities recognized in Net income (loss) in the period	1	(6)
Unrealized gains (losses) on Level 3 assets and liabilities recognized in Other comprehensive income (loss) in the period	(20)	32
Corporate and other bonds
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance, Beginning, Assets	1,045	810
Reported in Net investment gains (losses)	0	0
Reported in Other comprehensive income (loss)	(12)	24
Total realized and unrealized investment gains (losses)	(12)	24
Purchases	74	81
Sales	0	0
Settlements	(36)	(3)
Transfers into Level 3	11	0
Transfers out of Level 3	0	0
Balance, Ending, Assets	1,082	912
Unrealized gains (losses) on Level 3 assets and liabilities recognized in Net income (loss) in the period	0	0
Unrealized gains (losses) on Level 3 assets and liabilities recognized in Other comprehensive income (loss) in the period	(14)	24
States, municipalities and political subdivisions
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance, Beginning, Assets	44	43
Reported in Net investment gains (losses)	0	0
Reported in Other comprehensive income (loss)	(1)	1
Total realized and unrealized investment gains (losses)	(1)	1
Purchases	0	0
Sales	0	0
Settlements	0	0
Transfers into Level 3	0	0
Transfers out of Level 3	0	0
Balance, Ending, Assets	43	44
Unrealized gains (losses) on Level 3 assets and liabilities recognized in Net income (loss) in the period	0	0
Unrealized gains (losses) on Level 3 assets and liabilities recognized in Other comprehensive income (loss) in the period	(1)	1
Asset-backed
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance, Beginning, Assets	901	788
Reported in Net investment gains (losses)	(4)	0
Reported in Other comprehensive income (loss)	(5)	7
Total realized and unrealized investment gains (losses)	(3)	12
Purchases	18	55
Sales	(9)	0
Settlements	(17)	(9)
Transfers into Level 3	0	23
Transfers out of Level 3	(19)	(10)
Balance, Ending, Assets	871	859
Unrealized gains (losses) on Level 3 assets and liabilities recognized in Net income (loss) in the period	0	0
Unrealized gains (losses) on Level 3 assets and liabilities recognized in Other comprehensive income (loss) in the period	(5)	7
Equity securities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance, Beginning, Assets	24	35
Reported in Net investment gains (losses)	0	0
Reported in Other comprehensive income (loss)	0	0
Total realized and unrealized investment gains (losses)	6	(6)
Purchases	0	0
Sales	(19)	0
Settlements	0	0
Transfers into Level 3	0	0
Transfers out of Level 3	0	0
Balance, Ending, Assets	11	29
Unrealized gains (losses) on Level 3 assets and liabilities recognized in Net income (loss) in the period	1	(6)
Unrealized gains (losses) on Level 3 assets and liabilities recognized in Other comprehensive income (loss) in the period	0	0
Reported in Net investment income
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Reported in Net investment income	12	(1)
Reported in Net investment income | Corporate and other bonds
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Reported in Net investment income	0	0
Reported in Net investment income | States, municipalities and political subdivisions
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Reported in Net investment income	0	0
Reported in Net investment income | Asset-backed
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Reported in Net investment income	6	5
Reported in Net investment income | Equity securities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Reported in Net investment income	$ 6	$ (6)

Fair Value (Narrative) (Details

Fair Value (Narrative) (Details) - USD ($) $ in Millions	Mar. 31, 2024	Dec. 31, 2023
Fair Value Disclosures [Abstract]
Other invested assets overseas deposit	$ 73	$ 75

Fair Value (Quantitative inform

Fair Value (Quantitative information about significant unobservable inputs in the fair value measurement of level 3 assets) (Details) $ in Millions	Mar. 31, 2024 USD ($)	Dec. 31, 2023 USD ($)
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Estimated fair value	$ 43,116	$ 43,116
Fixed maturity securities | Discounted cash flow
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Estimated fair value	$ 1,521	$ 1,495
Credit spread | Discounted cash flow | Minimum
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Debt securities, available-for-sale, measurement Input	0.01	0.01
Credit spread | Discounted cash flow | Maximum
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Debt securities, available-for-sale, measurement Input	0.07	0.07
Credit spread | Discounted cash flow | Weighted Average
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Debt securities, available-for-sale, measurement Input	0.02	0.02

Fair Value (Carrying amount and

Fair Value (Carrying amount and estimated fair value of financial instrument assets and liabilities which are not measured at fair value) (Details) - USD ($) $ in Millions	Mar. 31, 2024	Dec. 31, 2023
Assets
Mortgage loans	$ 1,029	$ 1,035
Liabilities
Long-term debt	2,970	2,481
Carrying Amount
Assets
Mortgage loans	1,029	1,035
Liabilities
Short-term debt	550	550
Long-term debt	2,970	2,481
Estimated Fair Value
Assets
Mortgage loans	987	997
Liabilities
Short-term debt	549	546
Long-term debt	2,852	2,385
Level 1 | Estimated Fair Value
Assets
Mortgage loans	0	0
Liabilities
Short-term debt	0	0
Long-term debt	0	0
Level 2 | Estimated Fair Value
Assets
Mortgage loans	0	0
Liabilities
Short-term debt	549	546
Long-term debt	2,852	2,385
Level 3 | Estimated Fair Value
Assets
Mortgage loans	987	997
Liabilities
Short-term debt	0	0
Long-term debt	$ 0	$ 0

Claim and Claim Adjustment Ex_3

Claim and Claim Adjustment Expense Reserves (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Dec. 31, 2023	Dec. 31, 2010
Liability for Claims and Claims Adjustment Expense [Line Items]
Unusual or infrequent item, or both, net of insurance proceeds	$ 88	$ 52
Retroactive reinsurance benefit recognized	12	$ 8
Cumulative amounts ceded under AEP Loss Portfolio Transfer	3,600		$ 3,600
Asbestos and Environmental Reserves
Liability for Claims and Claims Adjustment Expense [Line Items]
Net A&EP claim and allocated claim adjustment expense reserves ceded to NICO				$ 1,600
Aggregate limit under A&EP Loss Portfolio Transfer				4,000
A&EP claim and allocated claim adjustment expense reserves ceded under existing third party reinsurance contracts transferred to NICO under A&EP Loss Portfolio Transfer				1,200
Reinsurance premium paid to NICO under A&EP Loss Portfolio Transfer				2,000
Net reinsurance receivables transferred to NICO under A&EP Loss Portfolio Transfer				215
Total consideration paid to NICO under AEP Loss Portfolio Transfer				$ 2,200
Deferred reinsurance benefit yet to be recognized	405		$ 417
Fair value of collateral trust account established by NICO under A&EP Loss Portfolio Transfer	$ 2,600

Claim and Claim Adjustment Ex_4

Claim and Claim Adjustment Expense Reserves (Reconciliation of claim and claim adjustment expense reserves) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Reserves, beginning of year:
Gross	$ 23,304	$ 22,120
Ceded	5,141	5,191
Net reserves, beginning of year	18,163	16,929
Net incurred claim and claim adjustment expenses:
Provision for insured events of current year	1,502	1,326
Increase (decrease) in provision for insured events of prior years	(6)	13
Amortization of discount	10	11
Total net incurred	1,506	1,350
Net payments attributable to:
Current year events	(113)	(72)
Prior year events	(1,168)	(1,042)
Total net payments	(1,281)	(1,114)
Foreign currency translation adjustment and other	(41)	35
Net reserves, end of period	18,347	17,200
Ceded reserves, end of period	5,241	5,209
Gross reserves, end of period	$ 23,588	$ 22,409

Claim and Claim Adjustment Ex_5

Claim and Claim Adjustment Expense Reserves (Net prior year development) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Segment Reporting Information [Line Items]
Total pretax (favorable) unfavorable development	$ (7)	$ 13
Specialty
Segment Reporting Information [Line Items]
Total pretax (favorable) unfavorable development	(5)	0
Commercial
Segment Reporting Information [Line Items]
Total pretax (favorable) unfavorable development	(2)	(2)
International
Segment Reporting Information [Line Items]
Total pretax (favorable) unfavorable development	0	15
Corporate & Other
Segment Reporting Information [Line Items]
Total pretax (favorable) unfavorable development	$ 0	$ 0

Claim and Claim Adjustment Ex_6

Claim and Claim Adjustment Expense Reserves (Specialty - Net prior year claim and allocated claim adjustment expense reserve development) (Details) - Specialty - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Liability for Claims and Claims Adjustment Expense [Line Items]
Medical Professional Liability	$ 0	$ 9
Other Professional Liability and Management Liability	0	0
Surety	(18)	0
Warranty	13	(9)
Other	0	0
Total pretax (favorable) unfavorable development	$ (5)	$ 0

Claim and Claim Adjustment Ex_7

Claim and Claim Adjustment Expense Reserves (Commercial - Net prior year claim and allocated claim adjustment expense reserve development) (Details) - Commercial - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Liability for Claims and Claims Adjustment Expense [Line Items]
Commercial	$ 0	$ 0
General Liability	0	0
Workers' Compensation	(2)	(2)
Property and Other	0	0
Total pretax (favorable) unfavorable development	$ (2)	$ (2)

Claim and Claim Adjustment Ex_8

Claim and Claim Adjustment Expense Reserves (International - Net prior year claim and allocated claim adjustment expense reserve development) (Details) - International - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Liability for Claims and Claims Adjustment Expense [Line Items]
Commercial	$ 0	$ (2)
Specialty	0	19
Other	0	(2)
Total pretax (favorable) unfavorable development	$ 0	$ 15

Future Policy Benefit Reserve_2

Future Policy Benefit Reserves - Summary of Balances and Changes (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Dec. 31, 2023	Dec. 31, 2022
Present value of future net premiums
Balance, January 1	$ 3,710	$ 3,993
Effect of changes in discount rate	(56)	(154)	$ (125)	$ (74)
Balance, January 1, at original locked in discount rate	3,585	3,919
Effect of changes in cash flow assumptions			0	0
Expect of actual variances from expected experience			(28)	(49)
Adjusted balance, January 1			3,557	3,870
Interest accrual	47	52
Net premiums: earned during period	(107)	(111)
Balance, end of period at original locked in discount rate	3,497	3,811
Effect of changes in discount rate	56	154	125	74
Balance, March 31	3,553	3,965
Present value of future benefits & expenses
Balance, January 1	17,669	17,472
Effect of changes in discount rate	(78)	(704)	(578)	(125)
Balance, January 1, at original locked in discount rate	17,091	17,347
Effect of change in cash flow assumptions			0	0
Effect of actual variances from expected experience			(13)	(50)
Adjusted balance, January 1			17,078	17,297
Interest accrual	231	242
Benefit & expense payments	(321)	(302)
Balance, end of period at original locked in discount rate	16,988	17,237
Effect of changes in discount rate	78	704	578	$ 125
Balance, March 31	17,066	17,941
Net LFPB	13,513	13,976	$ 13,959
Insurance claims and policyholders benefits, including policyholders' dividends, remeasurement impact	$ (15)	$ 1

Future Policy Benefit Reserve_3

Future Policy Benefit Reserves - Earned Premiums and Interest Expense (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Insurance [Abstract]
Earned premiums	$ 110	$ 115
Interest expense	$ 184	$ 190

Future Policy Benefit Reserve_4

Future Policy Benefit Reserves - Undiscounted Expected Future Benefit and Expense Payments and Undiscounted Expected Future Gross Premiums (Details) - USD ($) $ in Millions	Mar. 31, 2024	Mar. 31, 2023
Insurance [Abstract]
Expected future benefit and expense payments	$ 32,474	$ 33,759
Expected future gross premiums	$ 5,270	$ 5,729

Future Policy Benefit Reserve_5

Future Policy Benefit Reserves - Narrative (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Insurance [Abstract]
Liability for future policy benefit, expected future gross premium, discounted, before reinsurance	$ 3,664	$ 4,046
Liability for future policy benefit, weighted-average duration	11 years	12 years
Liability future policy benefit, losses recognized in current period	$ 20	$ 13
Liability future policy benefit, losses recognized in prior period	$ 2	$ 11

Future Policy Benefit Reserve_6

Future Policy Benefit Reserves - Weighted Average Interest Rates (Details)	Mar. 31, 2024	Dec. 31, 2023	Mar. 31, 2023
Insurance [Abstract]
Original locked in discount rate	5.22%	5.22%	5.26%
Upper-medium grade fixed income instrument discount rate	5.20%	4.94%	4.92%

Legal Proceedings, Contingenc_2

Legal Proceedings, Contingencies and Guarantees (Narrative) (Details) $ in Billions	Mar. 31, 2024 USD ($)
Guarantee Obligations
Legal Proceedings, Commitments and Contingencies, and Guarantees [Line Items]
Guarantor obligations, maximum exposure, undiscounted	$ 1.5

Benefit Plans (Components of Ne

Benefit Plans (Components of Net Periodic Cost (Benefit)) (Details) - Pension Plan - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Defined Benefit Plan Disclosure [Line Items]
Interest cost on projected benefit obligation	$ 22	$ 25
Expected return on plan assets	(29)	(30)
Amortization of net actuarial loss	7	8
Total net periodic pension cost (benefit)	$ 0	$ 3

Benefit Plans (Schedule of Non-

Benefit Plans (Schedule of Non-Service Cost (Benefit) Presented in the Consolidated Statement of Operations) (Details) - Pension Plan - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Net periodic defined benefits expense (reversal of expense), excluding service cost component	$ 0	$ 3
Insurance claims and policyholder's benefits
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Net periodic defined benefits expense (reversal of expense), excluding service cost component	0	1
Other operating expenses
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Net periodic defined benefits expense (reversal of expense), excluding service cost component	$ 0	$ 2

Accumulated Other Comprehensi_3

Accumulated Other Comprehensive Income (Loss) by Component (Schedule of Accumulated Other Comprehensive Income (Loss) by Component) (Details) - USD ($) $ in Millions	3 Months Ended		12 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Dec. 31, 2022
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Total stockholder's equity at beginning of period	$ 9,893
Other comprehensive income (loss) before reclassifications	69	$ 265
Amounts reclassified from accumulated other comprehensive income (loss) net of tax	(31)	(25)
Other comprehensive income (loss) after tax (expense) benefit	100	290
Total stockholder's equity at end of period	9,662	8,667
Cumulative effect adjustments from changes in accounting guidance, tax			$ 11
Reclassification from AOCI, tax	8	6
Tax (expense) benefit on other comprehensive income (loss)	(35)	(75)
Accumulated other comprehensive income (loss)
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Total stockholder's equity at beginning of period	(2,672)	(3,598)
Total stockholder's equity at end of period	(2,572)	(3,308)	(3,598)
Accumulated other comprehensive income (loss) | Previously Reported
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Total stockholder's equity at beginning of period	(2,672)	(3,557)
Total stockholder's equity at end of period			(3,557)
Accumulated other comprehensive income (loss) | Revision of Prior Period, Accounting Standards Update, Adjustment
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Total stockholder's equity at beginning of period	0	(41)
Total stockholder's equity at end of period			(41)
Net unrealized gains (losses) on investments | Net unrealized gains (losses) on investments with an allowance for credit losses
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Total stockholder's equity at beginning of period	(12)	(7)
Other comprehensive income (loss) before reclassifications	(1)	(8)
Amounts reclassified from accumulated other comprehensive income (loss) net of tax	(3)	0
Other comprehensive income (loss) after tax (expense) benefit	2	(8)
Total stockholder's equity at end of period	(10)	(15)	(7)
Cumulative effect adjustments from changes in accounting guidance, tax			0
Reclassification from AOCI, tax	1	0
Tax (expense) benefit on other comprehensive income (loss)	(1)	2
Net unrealized gains (losses) on investments | Net unrealized gains (losses) on investments with an allowance for credit losses | Previously Reported
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Total stockholder's equity at beginning of period		(7)
Total stockholder's equity at end of period			(7)
Net unrealized gains (losses) on investments | Net unrealized gains (losses) on investments with an allowance for credit losses | Revision of Prior Period, Accounting Standards Update, Adjustment
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Total stockholder's equity at beginning of period		0
Total stockholder's equity at end of period			0
Net unrealized gains (losses) on investments | Net unrealized gains and losses on other investments
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Total stockholder's equity at beginning of period	(1,613)	(2,738)
Other comprehensive income (loss) before reclassifications	(239)	652
Amounts reclassified from accumulated other comprehensive income (loss) net of tax	(22)	(18)
Other comprehensive income (loss) after tax (expense) benefit	(217)	670
Total stockholder's equity at end of period	(1,830)	(2,068)	(2,738)
Cumulative effect adjustments from changes in accounting guidance, tax			0
Reclassification from AOCI, tax	6	4
Tax (expense) benefit on other comprehensive income (loss)	58	(180)
Net unrealized gains (losses) on investments | Net unrealized gains and losses on other investments | Previously Reported
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Total stockholder's equity at beginning of period		(2,738)
Total stockholder's equity at end of period			(2,738)
Net unrealized gains (losses) on investments | Net unrealized gains and losses on other investments | Revision of Prior Period, Accounting Standards Update, Adjustment
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Total stockholder's equity at beginning of period		0
Total stockholder's equity at end of period			0
Pension and postretirement benefits
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Total stockholder's equity at beginning of period	(525)	(591)
Other comprehensive income (loss) before reclassifications	0	0
Amounts reclassified from accumulated other comprehensive income (loss) net of tax	(6)	(7)
Other comprehensive income (loss) after tax (expense) benefit	6	7
Total stockholder's equity at end of period	(519)	(584)	(591)
Cumulative effect adjustments from changes in accounting guidance, tax			0
Reclassification from AOCI, tax	1	2
Tax (expense) benefit on other comprehensive income (loss)	(1)	(2)
Pension and postretirement benefits | Previously Reported
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Total stockholder's equity at beginning of period		(591)
Total stockholder's equity at end of period			(591)
Pension and postretirement benefits | Revision of Prior Period, Accounting Standards Update, Adjustment
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Total stockholder's equity at beginning of period		0
Total stockholder's equity at end of period			0
Cumulative impact of changes in discount rates used to measure long duration contracts
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Total stockholder's equity at beginning of period	(359)	(41)
Other comprehensive income (loss) before reclassifications	341	(396)
Amounts reclassified from accumulated other comprehensive income (loss) net of tax	0	0
Other comprehensive income (loss) after tax (expense) benefit	341	(396)
Total stockholder's equity at end of period	(18)	(437)	(41)
Cumulative effect adjustments from changes in accounting guidance, tax			11
Reclassification from AOCI, tax	0	0
Tax (expense) benefit on other comprehensive income (loss)	(91)	105
Cumulative impact of changes in discount rates used to measure long duration contracts | Previously Reported
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Total stockholder's equity at beginning of period		0
Total stockholder's equity at end of period			0
Cumulative impact of changes in discount rates used to measure long duration contracts | Revision of Prior Period, Accounting Standards Update, Adjustment
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Total stockholder's equity at beginning of period		(41)
Total stockholder's equity at end of period			(41)
Cumulative foreign currency translation adjustment
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Total stockholder's equity at beginning of period	(163)	(221)
Other comprehensive income (loss) before reclassifications	(32)	17
Amounts reclassified from accumulated other comprehensive income (loss) net of tax	0	0
Other comprehensive income (loss) after tax (expense) benefit	(32)	17
Total stockholder's equity at end of period	(195)	(204)	(221)
Cumulative effect adjustments from changes in accounting guidance, tax			0
Reclassification from AOCI, tax	0	0
Tax (expense) benefit on other comprehensive income (loss)	$ 0	0
Cumulative foreign currency translation adjustment | Previously Reported
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Total stockholder's equity at beginning of period		(221)
Total stockholder's equity at end of period			(221)
Cumulative foreign currency translation adjustment | Revision of Prior Period, Accounting Standards Update, Adjustment
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Total stockholder's equity at beginning of period		$ 0
Total stockholder's equity at end of period			$ 0

Business Segments (Narrative) (

Business Segments (Narrative) (Details)	3 Months Ended
	Mar. 31, 2024 segment
Core Segments - Specialty, Commercial and International
Segment Reporting Information [Line Items]
Number of operating segments	3
Non-Core Segments - Life & Group and Corporate & Other
Segment Reporting Information [Line Items]
Number of operating segments	2

Business Segments (Income State

Business Segments (Income Statement Information) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Operating revenues
Net earned premiums	$ 2,441	$ 2,248
Net investment income	609	525
Non-insurance warranty revenue	407	407
Other revenues	9	7
Total operating revenues	3,466	3,187
Claims, Benefits and Expenses
Net incurred claims and benefits	1,798	1,646
Policyholders’ dividends	9	7
Amortization of deferred acquisition costs	444	379
Non-insurance warranty expense	394	384
Other insurance related expenses	287	305
Other expenses	85	60
Total claims, benefits and expenses	3,017	2,781
Core income (loss) before income tax	449	406
Income tax (expense) benefit on core income (loss)	(94)	(81)
Core income (loss)	355	325
Net investment gains (losses)	(22)	(35)
Income tax (expense) benefit on net investment gains (losses)	5	7
Net investment gains (losses), after tax	(17)	(28)
Net income (loss)	338	297
Operating Segments | Specialty
Operating revenues
Net earned premiums	814	797
Net investment income	150	129
Non-insurance warranty revenue	407	407
Other revenues	1	0
Total operating revenues	1,372	1,333
Claims, Benefits and Expenses
Net incurred claims and benefits	477	465
Policyholders’ dividends	2	1
Amortization of deferred acquisition costs	178	165
Non-insurance warranty expense	394	384
Other insurance related expenses	81	86
Other expenses	15	14
Total claims, benefits and expenses	1,147	1,115
Core income (loss) before income tax	225	218
Income tax (expense) benefit on core income (loss)	(48)	(47)
Core income (loss)	177	171
Operating Segments | Commercial
Operating revenues
Net earned premiums	1,202	1,046
Net investment income	176	149
Non-insurance warranty revenue	0	0
Other revenues	8	7
Total operating revenues	1,386	1,202
Claims, Benefits and Expenses
Net incurred claims and benefits	828	688
Policyholders’ dividends	7	6
Amortization of deferred acquisition costs	200	169
Non-insurance warranty expense	0	0
Other insurance related expenses	138	142
Other expenses	12	6
Total claims, benefits and expenses	1,185	1,011
Core income (loss) before income tax	201	191
Income tax (expense) benefit on core income (loss)	(43)	(40)
Core income (loss)	158	151
Operating Segments | International
Operating revenues
Net earned premiums	315	290
Net investment income	31	23
Non-insurance warranty revenue	0	0
Other revenues	0	0
Total operating revenues	346	313
Claims, Benefits and Expenses
Net incurred claims and benefits	189	189
Policyholders’ dividends	0	0
Amortization of deferred acquisition costs	66	45
Non-insurance warranty expense	0	0
Other insurance related expenses	39	47
Other expenses	2	1
Total claims, benefits and expenses	296	282
Core income (loss) before income tax	50	31
Income tax (expense) benefit on core income (loss)	(13)	(7)
Core income (loss)	37	24
Operating Segments | Life & Group
Operating revenues
Net earned premiums	110	115
Net investment income	231	214
Non-insurance warranty revenue	0	0
Other revenues	0	0
Total operating revenues	341	329
Claims, Benefits and Expenses
Net incurred claims and benefits	312	311
Policyholders’ dividends	0	0
Amortization of deferred acquisition costs	0	0
Non-insurance warranty expense	0	0
Other insurance related expenses	29	29
Other expenses	0	1
Total claims, benefits and expenses	341	341
Core income (loss) before income tax	0	(12)
Income tax (expense) benefit on core income (loss)	5	9
Core income (loss)	5	(3)
Operating Segments | Corporate & Other
Operating revenues
Net earned premiums	0	0
Net investment income	21	10
Non-insurance warranty revenue	0	0
Other revenues	3	3
Total operating revenues	24	13
Claims, Benefits and Expenses
Net incurred claims and benefits	(8)	(7)
Policyholders’ dividends	0	0
Amortization of deferred acquisition costs	0	0
Non-insurance warranty expense	0	0
Other insurance related expenses	0	1
Other expenses	59	41
Total claims, benefits and expenses	51	35
Core income (loss) before income tax	(27)	(22)
Income tax (expense) benefit on core income (loss)	5	4
Core income (loss)	(22)	(18)
Eliminations
Operating revenues
Net earned premiums	0	0
Net investment income	0	0
Non-insurance warranty revenue	0	0
Other revenues	(3)	(3)
Total operating revenues	(3)	(3)
Claims, Benefits and Expenses
Net incurred claims and benefits	0	0
Policyholders’ dividends	0	0
Amortization of deferred acquisition costs	0	0
Non-insurance warranty expense	0	0
Other insurance related expenses	0	0
Other expenses	(3)	(3)
Total claims, benefits and expenses	(3)	(3)
Core income (loss) before income tax	0	0
Income tax (expense) benefit on core income (loss)	0	0
Core income (loss)	$ 0	$ 0

Business Segments (Balance Shee

Business Segments (Balance Sheet Information) (Details) - USD ($) $ in Millions	Mar. 31, 2024	Dec. 31, 2023	Mar. 31, 2023
Segment Reporting Information [Line Items]
Reinsurance receivables	$ 5,596	$ 5,434
Insurance receivables	3,458	3,470
Deferred acquisition costs	927	896
Goodwill	146	146
Deferred non-insurance warranty acquisition expense	3,621	3,661
Insurance reserves
Claim and claim adjustment expenses	23,588	23,304
Unearned premiums	7,046	6,933
Future policy benefits	13,513	13,959	$ 13,976
Deferred non-insurance warranty revenue	4,645	4,694
Operating Segments | Specialty
Segment Reporting Information [Line Items]
Reinsurance receivables	1,432	1,281
Insurance receivables	979	1,053
Deferred acquisition costs	401	392
Goodwill	117	117
Deferred non-insurance warranty acquisition expense	3,621	3,661
Insurance reserves
Claim and claim adjustment expenses	7,221	7,131
Unearned premiums	3,193	3,227
Future policy benefits	0	0
Deferred non-insurance warranty revenue	4,645	4,694
Operating Segments | Commercial
Segment Reporting Information [Line Items]
Reinsurance receivables	1,279	1,218
Insurance receivables	2,096	2,024
Deferred acquisition costs	394	371
Goodwill	0	0
Deferred non-insurance warranty acquisition expense	0	0
Insurance reserves
Claim and claim adjustment expenses	10,332	10,103
Unearned premiums	2,996	2,858
Future policy benefits	0	0
Deferred non-insurance warranty revenue	0	0
Operating Segments | International
Segment Reporting Information [Line Items]
Reinsurance receivables	477	468
Insurance receivables	379	388
Deferred acquisition costs	132	133
Goodwill	29	29
Deferred non-insurance warranty acquisition expense	0	0
Insurance reserves
Claim and claim adjustment expenses	2,745	2,709
Unearned premiums	740	749
Future policy benefits	0	0
Deferred non-insurance warranty revenue	0	0
Operating Segments | Life & Group
Segment Reporting Information [Line Items]
Reinsurance receivables	92	93
Insurance receivables	4	5
Deferred acquisition costs	0	0
Goodwill	0	0
Deferred non-insurance warranty acquisition expense	0	0
Insurance reserves
Claim and claim adjustment expenses	663	675
Unearned premiums	118	99
Future policy benefits	13,513	13,959
Deferred non-insurance warranty revenue	0	0
Operating Segments | Corporate & Other
Segment Reporting Information [Line Items]
Reinsurance receivables	2,316	2,374
Insurance receivables	0	0
Deferred acquisition costs	0	0
Goodwill	0	0
Deferred non-insurance warranty acquisition expense	0	0
Insurance reserves
Claim and claim adjustment expenses	2,627	2,686
Unearned premiums	0	0
Future policy benefits	0	0
Deferred non-insurance warranty revenue	0	0
Eliminations
Segment Reporting Information [Line Items]
Reinsurance receivables	0	0
Insurance receivables	0	0
Deferred acquisition costs	0	0
Goodwill	0	0
Deferred non-insurance warranty acquisition expense	0	0
Insurance reserves
Claim and claim adjustment expenses	0	0
Unearned premiums	(1)	0
Future policy benefits	0	0
Deferred non-insurance warranty revenue	$ 0	$ 0

Business Segments (Revenues by

Business Segments (Revenues by Line of Business) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Total revenues	$ 3,444	$ 3,152
Total operating revenues	3,466	3,187
Net investment gains (losses)	(22)	(35)
Operating Segments | Specialty
Total revenues	1,372	1,333
Operating Segments | Commercial
Total revenues	1,386	1,202
Operating Segments | International
Total revenues	346	313
Operating Segments | Life & Group
Total revenues	341	329
Operating Segments | Corporate & Other
Total revenues	24	13
Eliminations
Total revenues	(3)	(3)
Management & Professional Liability | Operating Segments | Specialty
Total revenues	729	705
Surety | Operating Segments | Specialty
Total revenues	182	168
Warranty & Alternative Risks | Operating Segments | Specialty
Total revenues	461	460
Middle Market | Operating Segments | Commercial
Total revenues	432	398
Construction | Operating Segments | Commercial
Total revenues	455	385
Small Business | Operating Segments | Commercial
Total revenues	154	150
Other Commercial | Operating Segments | Commercial
Total revenues	345	269
Canada | Operating Segments | International
Total revenues	98	93
Europe | Operating Segments | International
Total revenues	143	127
Hardy | Operating Segments | International
Total revenues	$ 105	$ 93

Non-Insurance Revenues from C_2

Non-Insurance Revenues from Contracts with Customers (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Dec. 31, 2023
Revenue from Contract with Customer [Abstract]
Deferred non-insurance warranty revenue	$ 4,645		$ 4,694
Contract with customer, liability, revenue recognized	$ 400	$ 400

Non-Insurance Revenues from C_3

Non-Insurance Revenues from Contracts with Customers (Performance obligation) (Details) $ in Billions	Mar. 31, 2024 USD ($)
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2024-04-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Remaining performance obligation, amount	$ 1.1
Remaining performance obligation, expected timing of satisfaction, period	9 months
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2025-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Remaining performance obligation, amount	$ 1.1
Remaining performance obligation, expected timing of satisfaction, period	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2026-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Remaining performance obligation, amount	$ 0.9
Remaining performance obligation, expected timing of satisfaction, period	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2027-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Remaining performance obligation, amount	$ 1.5
Remaining performance obligation, expected timing of satisfaction, period