Loews (L) 10-Q 7 May 21 2021 Q1 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	3 Months Ended
	Mar. 31, 2021	Apr. 30, 2021
Cover [Abstract]
Entity Registrant Name	LOEWS CORP
Entity Central Index Key	0000060086
Current Fiscal Year End Date	--12-31
Document Type	10-Q
Amendment Flag	false
Document Quarterly Report	true
Document Period End Date	Mar. 31, 2021
Document Fiscal Year Focus	2021
Document Fiscal Period Focus	Q1
Document Transition Report	false
Entity File Number	1-6541
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	13-2646102
Entity Address, Address Line One	667 Madison Avenue
Entity Address, City or Town	New York
Entity Address, State or Province	NY
Entity Address, Postal Zip Code	10065-8087
City Area Code	212
Local Phone Number	521-2000
Title of 12(b) Security	Common stock, par value $0.01 per share
Trading Symbol	L
Security Exchange Name	NYSE
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		263,175,591

CONSOLIDATED CONDENSED BALANCE

CONSOLIDATED CONDENSED BALANCE SHEETS - USD ($) $ in Millions	Mar. 31, 2021	Dec. 31, 2020
Investments:
Fixed maturities, amortized cost of $39,293 and $38,963, less allowance for credit loss of $43 and $40	$ 43,584	$ 44,646
Equity securities, cost of $1,455 and $1,456	1,580	1,561
Limited partnership investments	1,769	1,798
Other invested assets, primarily mortgage loans, less allowance for credit loss of $26 and $26	1,144	1,165
Short term investments	4,282	4,674
Total investments	52,359	53,844
Cash	660	478
Receivables	8,539	7,833
Property, plant and equipment	9,921	10,451
Goodwill	349	785
Deferred non-insurance warranty acquisition expenses	3,149	3,068
Deferred acquisition costs of insurance subsidiaries	741	708
Other assets	2,501	3,069
Assets held for sale	1,786
Total assets	80,005	80,236
Insurance reserves:
Claim and claim adjustment expense	23,056	22,706
Future policy benefits	12,772	13,318
Unearned premiums	5,319	5,119
Total insurance reserves	41,147	41,143
Payable to brokers	310	92
Short term debt	141	37
Long term debt	8,996	10,072
Deferred income taxes	924	1,065
Deferred non-insurance warranty revenue	4,119	4,023
Other liabilities	4,375	4,623
Liabilities held for sale	1,456
Total liabilities	61,468	61,055
Commitments and contingent liabilities
Preferred stock, $0.10 par value: Authorized - 100,000,000 shares
Common stock, $0.01 par value: Authorized - 1,800,000,000 shares Issued - 269,472,042 and 269,360,973 shares	3	3
Additional paid-in capital	3,119	3,133
Retained earnings	14,394	14,150
Accumulated other comprehensive income	34	581
Shareholders' equity before treasury stock, total	17,550	17,867
Less treasury stock, at cost (5,708,164 and 150,000 shares)	(280)	(7)
Total shareholders' equity	17,270	17,860
Noncontrolling interests	1,267	1,321
Total equity	18,537	19,181
Total liabilities and equity	$ 80,005	$ 80,236

CONSOLIDATED CONDENSED BALANC_2

CONSOLIDATED CONDENSED BALANCE SHEETS (Parenthetical) - USD ($) $ in Millions	Mar. 31, 2021	Dec. 31, 2020
Investments:
Fixed maturities, amortized cost	$ 39,293	$ 38,963
Fixed maturities, amortized cost, allowance for credit loss	43	40
Equity securities, cost	1,455	1,456
Other invested assets, primarily mortgage loans, allowance for credit loss	$ 26	$ 26
Liabilities and Equity:
Preferred stock, par value (in dollars per share)	$ 0.10	$ 0.10
Preferred stock, shares authorized (in shares)	100,000,000	100,000,000
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized (in shares)	1,800,000,000	1,800,000,000
Common stock, shares issued (in shares)	269,472,042	269,360,973
Treasury stock, shares (in shares)	5,708,164	150,000

CONSOLIDATED CONDENSED STATEMEN

CONSOLIDATED CONDENSED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Millions		3 Months Ended
		Mar. 31, 2021	Mar. 31, 2020
Revenues:
Insurance premiums		$ 1,962	$ 1,869
Net investment income		550	163
Investment gains (losses)	[1]	57	(216)
Non-insurance warranty revenue		338	301
Operating revenues and other		715	982
Total		3,622	3,099
Expenses:
Insurance claims and policyholders' benefits		1,506	1,425
Amortization of deferred acquisition costs		359	344
Non-insurance warranty expense		311	281
Operating expenses and other		914	2,026
Interest		125	144
Total		3,215	4,220
Income (loss) before income tax		407	(1,121)
Income tax (expense) benefit		(114)	77
Net income (loss)		293	(1,044)
Amounts attributable to noncontrolling interests		(32)	412
Net income (loss) attributable to Loews Corporation		$ 261	$ (632)
Basic net income (loss) per share (in dollars per share)		$ 0.98	$ (2.20)
Diluted net income (loss) per share (in dollars per share)		$ 0.97	$ (2.20)
Weighted average shares outstanding:
Shares of common stock (in shares)		267,390	287,040
Dilutive potential shares of common stock (in shares)		370
Total weighted average shares outstanding assuming dilution (in shares)		267,760	287,040
[1]	Gross investment gains on available-for-sale securities were $58 and $29 for the three months ended March 31, 2021 and 2020. Gross investment losses on available-for-sale securities were $20 and $104 for the three months ended March 31, 2021 and 2020. During the three months ended March 31, 2021 and 2020, $2 of investment gains and $133 of investment losses were recognized due to the change in fair value of non-redeemable preferred stock still held as of March 31, 2021 and 2020.

CONSOLIDATED CONDENSED STATEM_2

CONSOLIDATED CONDENSED STATEMENTS OF COMPREHENSIVE LOSS - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
CONSOLIDATED CONDENSED STATEMENTS OF COMPREHENSIVE LOSS [Abstract]
Net income (loss)	$ 293	$ (1,044)
Other comprehensive loss, after tax
Net unrealized losses on investments with an allowance for credit losses		(11)
Net unrealized losses on other investments	(627)	(1,044)
Total unrealized losses on investments	(627)	(1,055)
Unrealized gains (losses) on cash flow hedges	4	(19)
Pension and postretirement benefits	9	14
Foreign currency translation	3	(84)
Other comprehensive loss	(611)	(1,144)
Comprehensive loss	(318)	(2,188)
Amounts attributable to noncontrolling interests	32	531
Total comprehensive loss attributable to Loews Corporation	$ (286)	$ (1,657)

CONSOLIDATED CONDENSED STATEM_3

CONSOLIDATED CONDENSED STATEMENTS OF EQUITY - USD ($) $ in Millions	Total	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Common Stock Held in Treasury [Member]	Noncontrolling Interests [Member]	Cumulative Effect, Period of Adoption, Adjustment [Member]	Cumulative Effect, Period of Adoption, Adjustment [Member]Retained Earnings [Member]	Cumulative Effect, Period of Adoption, Adjusted Balance [Member]	Cumulative Effect, Period of Adoption, Adjusted Balance [Member]Common Stock [Member]	Cumulative Effect, Period of Adoption, Adjusted Balance [Member]Additional Paid-in Capital [Member]	Cumulative Effect, Period of Adoption, Adjusted Balance [Member]Retained Earnings [Member]	Cumulative Effect, Period of Adoption, Adjusted Balance [Member]Accumulated Other Comprehensive Income (Loss) [Member]	Cumulative Effect, Period of Adoption, Adjusted Balance [Member]Common Stock Held in Treasury [Member]	Cumulative Effect, Period of Adoption, Adjusted Balance [Member]Noncontrolling Interests [Member]
Balance at Dec. 31, 2019	$ 21,930	$ 3	$ 3,374	$ 15,823	$ (68)	$ (13)	$ 2,811	$ (5)	$ (5)	$ 21,925	$ 3	$ 3,374	$ 15,818	$ (68)	$ (13)	$ 2,811
Increase (Decrease) in Shareholders' Equity [Roll Forward]
Net income (loss)	(1,044)			(632)			(412)
Other comprehensive income (loss)	(1,144)				(1,025)		(119)
Dividends paid ($0.0625 per share)	(87)			(18)
Dividends paid ($0.0625 per share)							(69)
Purchases of Loews Corporation treasury stock	(445)					(445)
Purchases of subsidiary stock from non-controlling interests	(18)						(18)
Stock-based compensation	(4)		(22)				18
Other	(5)		(5)	(1)			1
Balance at Mar. 31, 2020	19,178	3	3,347	15,167	(1,093)	(458)	2,212
Balance at Dec. 31, 2020	19,181	3	3,133	14,150	581	(7)	1,321
Increase (Decrease) in Shareholders' Equity [Roll Forward]
Net income (loss)	293			261			32
Other comprehensive income (loss)	(611)				(547)		(64)
Dividends paid ($0.0625 per share)	(49)			(17)
Dividends paid ($0.0625 per share)							(32)
Purchases of Loews Corporation treasury stock	(274)					(274)
Purchases of subsidiary stock from non-controlling interests	(3)						(3)
Stock-based compensation	4		(11)				15
Other	(4)		(3)			1	(2)
Balance at Mar. 31, 2021	$ 18,537	$ 3	$ 3,119	$ 14,394	$ 34	$ (280)	$ 1,267

CONSOLIDATED CONDENSED STATEM_4

CONSOLIDATED CONDENSED STATEMENTS OF EQUITY (Parenthetical) - $ / shares	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
CONSOLIDATED CONDENSED STATEMENTS OF EQUITY [Abstract]
Dividends paid per share (in dollars per share)	$ 0.0625	$ 0.0625

CONSOLIDATED CONDENSED STATEM_5

CONSOLIDATED CONDENSED STATEMENTS OF CASH FLOWS - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Operating Activities:
Net income (loss)	$ 293	$ (1,044)
Adjustments to reconcile net income (loss) to net cash provided by operating activities, net	257	1,363
Changes in operating assets and liabilities, net:
Receivables	(736)	(266)
Deferred acquisition costs	(32)	(27)
Insurance reserves	605	510
Other assets	(250)	(116)
Other liabilities	126	(288)
Trading securities	(129)	197
Net cash flow provided by operating activities	134	329
Investing Activities:
Purchases of fixed maturities	(2,203)	(1,818)
Proceeds from sales of fixed maturities	907	823
Proceeds from maturities of fixed maturities	1,084	799
Purchases of equity securities	(81)	(220)
Proceeds from sales of equity securities	119	98
Purchases of limited partnership investments	(61)	(32)
Proceeds from sales of limited partnership investments	49	204
Purchases of property, plant and equipment	(87)	(233)
Change in short term investments	569	837
Other, net	10	(31)
Net cash flow provided by investing activities	306	427
Financing Activities:
Dividends paid	(17)	(18)
Dividends paid to noncontrolling interests	(32)	(69)
Purchases of Loews Corporation treasury stock	(280)	(458)
Purchases of subsidiary stock from noncontrolling interests	(3)	(18)
Principal payments on debt	(1,073)	(223)
Issuance of debt	1,159	654
Other, net	(12)	(12)
Net cash flow used by financing activities	(258)	(144)
Effect of foreign exchange rate on cash		(9)
Net change in cash	182	603
Cash, beginning of period	478	336
Cash, end of period	$ 660	$ 939

Basis of Presentation

Basis of Presentation	3 Months Ended
	Mar. 31, 2021
Basis of Presentation [Abstract]
Basis of Presentation	1. Basis of Presentation Loews Corporation is a holding company. Its subsidiaries are engaged in the following lines of business: commercial property and casualty insurance (CNA Financial Corporation (“CNA”), an owned subsidiary); transportation and storage of natural gas and natural gas liquids (Boardwalk Pipeline Partners, LP (“Boardwalk Pipelines”), a wholly owned subsidiary); the operation of a chain of hotels (Loews Hotels Holding Corporation (“Loews Hotels & Co”), a wholly owned subsidiary); and the manufacture of rigid plastic packaging solutions (Altium Packaging LLC (“Altium Packaging”), a owned subsidiary). Unless the context otherwise requires, the term “Company” as used herein means Loews Corporation including its subsidiaries, the term “Net income (loss) attributable to Loews Corporation” as used herein means Net income (loss) attributable to Loews Corporation shareholders On April 1, 2021, Loews Corporation sold 47% of its interest in Altium Packaging. See Note 2 for further discussion. As a result of the April 26, 2020 bankruptcy filing of Diamond Offshore Drilling, Inc. (“Diamond Offshore”) and certain of its subsidiaries and applicable accounting principles generally accepted in the United States of America (“GAAP”), Diamond Offshore was deconsolidated from Loews Corporation’s consolidated financial statements in the second quarter of 2020. Loews Corporation’s operating results for the first quarter of 2020 include the operations of Diamond Offshore. During the first quarter of 2020, Diamond Offshore recorded an aggregate asset impairment charge of $774 million ($408 million after tax and noncontrolling interests), which is reported within Operating expenses and other on the Consolidated Condensed Statements of Operations. For additional information regarding the deconsolidation of Diamond Offshore and the Diamond Offshore asset impairments, see Notes 2 and 6 of the Consolidated Financial Statements in the Company’s Annual Report on Form 10-K for the year ended December 31, 2020. In the opinion of management, the accompanying unaudited Consolidated Condensed Financial Statements reflect all adjustments (consisting of normal recurring accruals) necessary to present fairly the Company’s financial position as of March 31, 2021 and December 31, 2020 and results of operations, comprehensive loss and changes in shareholders’ equity and cash flows for the three months ended March 31, 2021 and 2020. Net income (loss) for the first quarter of each of the years is not necessarily indicative of net income (loss) for that entire year. These Consolidated Condensed Financial Statements should be read in conjunction with the Consolidated Financial Statements in the Company’s Annual Report on Form 10-K for the year ended December 31, 2020. The Company presents basic and diluted net income (loss) per share on the Consolidated Condensed Statements of Operations. Basic net income (loss) per share excludes dilution and is computed by dividing net income (loss) attributable to common stock by the weighted average number of common shares outstanding for the period. Diluted net income 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. For the three months ended March 31, 2021 there were no shares attributable to employee stock-based compensation awards excluded from the diluted weighted average shares outstanding amounts because the effect would have been antidilutive. Recently issued ASUs – In August of 2018 the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) 2018-12 “Financial Services – Insurance (Topic 944 : Targeted Improvements to the Accounting for Long-Duration Contracts.” The updated accounting guidance requires changes to the measurement and disclosure of long-duration contracts. The guidance requires entities to update annually cash flow assumptions, including morbidity and persistency, and update quarterly discount rate assumptions using an upper-medium grade fixed-income instrument yield. The effect of changes in cash flow assumptions will be recorded in Net income and the effect of changes in discount rate assumptions will be recorded in Other comprehensive income (“OCI”).

Significant Transaction

Significant Transaction	3 Months Ended
	Mar. 31, 2021
Significant Transaction [Abstract]
Significant Transaction	2. Significant Transaction Altium Packaging On March 12, 2021, Loews Corporation entered into a definitive agreement to sell 47% of its interest in Altium Packaging to GIC, Singapore’s sovereign wealth fund. On April 1, 2021, the transaction closed and Loews Corporation received approximately $420 million in cash consideration, subject to expenses and post-closing adjustments. Loews Corporation will share certain participating rights with GIC related to capital allocation and other decisions by Altium Packaging. Therefore, in accordance with Accounting Standards Codification (“ASC”) 810, “Consolidation,” Altium Packaging will be deconsolidated from Loews Corporation’s consolidated financial statements effective as of April 1, 2021. The assets and liabilities of Altium Packaging have been classified as held for sale at March 31, 2021, and a deferred tax liability of $35 million was recorded in the three months ended March 31, 2021. Assets held for sale of $1.8 billion primarily consist of property, plant and equipment of $0.5 billion, goodwill of $0.4 billion, intangible assets of $0.5 billion and other assets of $0.4 billion. Liabilities held for sale of $1.5 billion primarily consist of $1.1 billion of long term debt and other liabilities of $0.4 billion. The transaction will result in a pretax gain of approximately $560 million to be recorded in the second quarter of 2021 and the retained 53% investment in Altium Packaging will initially be recorded at an estimated fair value of $475 million. The gain will be recorded in Investment gains (losses) on the Consolidated Condensed Statement of Operations. Effective April 1, 2021, Loews Corporation’s investment in Altium Packaging will be accounted for under the equity method of accounting.

Investments

Investments	3 Months Ended
	Mar. 31, 2021
Investments [Abstract]
Investments	3. Investments Net investment income is as follows: Three Months Ended March 31 2021 2020 (In millions) Fixed maturity securities $ 428 $ 438 Limited partnership investments 47 (102 ) Short term investments 7 Equity securities 29 (44 ) Income (loss) from trading portfolio (a) 50 (129 ) Other 16 14 Total investment income 570 184 Investment expenses (20 ) (21 ) Net investment income $ 550 $ 163 (a) Net unrealized gains (losses) related to changes in fair value on securities still held were $32 and $(117) for the three months ended March 31, 2021 and 2020. Investment gains (losses) are as follows: Three Months Ended March 31 2021 2020 (In millions) Fixed maturity securities $ 38 $ (75 ) Equity securities 2 (133 ) Derivative instruments 17 5 Short term investments and other (13 ) Investment gains (losses) (a) $ 57 $ (216 ) (a) Gross investment gains on available-for-sale securities were $ and $ for the three months ended March 31, 2021 and 2020. Gross investment losses on available-for-sale securities were $ and $ for the three months ended March 31, 2021 and 2020. During the three months ended March 31, 2021 and 2020, $ of investment gains and of investment losses were recognized due to the change in fair value of non-redeemable preferred stock still held as of March and . 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 receivables on available-for-sale fixed maturity securities totaled $ million, $ million and as of March 31, 2021, December 31, 2020 and March 31, 2020 and are excluded from the estimate of expected credit losses and the amortized cost basis in the tables within this Note. Three months ended March 31, 2021 Corporate and Other Bonds Asset-backed Total (In millions) Allowance for credit losses: Balance as of January 1, 2021 $ 23 $ 17 $ 40 Additions to the allowance for credit losses: Securities for which credit losses were not previously recorded 14 14 Available-for-sale securities accounted for as PCD assets 2 2 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 Additional decreases to the allowance for credit losses on securities that had an allowance recorded in a previous period (6 ) (1 ) (7 ) Total allowance for credit losses $ 27 $ 16 $ 43 Three months ended March 31, 2020 Allowance for credit losses: Balance as of January 1, 2020 $ - $ - $ - Additions to the allowance for credit losses: Impact of adopting ASC 326 6 6 Securities for which credit losses were not previously recorded 48 48 Available-for-sale securities accounted for as PCD assets 1 1 Reductions to the allowance for credit losses: Securities sold during the period (realized) 5 5 Intent to sell or more likely than not will be required to sell the security before recovery of its amortized cost basis 1 1 Total allowance for credit losses $ 49 $ - $ 49 The components of available-for-sale impairment losses recognized in earnings by asset type are presented in the following table. The table includes losses on securities with an intention to sell and changes in the allowance for credit losses on securities since acquisition date: Three Months Ended March 31 2021 2020 (In millions) Fixed maturity securities available-for-sale: Corporate and other bonds $ 7 $ 91 Asset-backed (1 ) 1 Impairment losses recognized in earnings $ 6 $ 92 There were no losses recognized on mortgage loans during the three months ended March 31, 2021. During the three months ended March 31, 2020, $13 million of losses were recognized related to mortgage loans due to changes in expected credit losses. The amortized cost and fair values of fixed maturity securities are as follows: March 31 2021 Cost or Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Allowance for Credit Losses Estimated Fair Value (In millions) Fixed maturity securities: Corporate and other bonds $ 21,110 $ 2,644 $ 71 $ 27 $ 23,656 States, municipalities and political subdivisions 10,041 1,590 31 11,600 Asset-backed: Residential mortgage-backed 3,215 108 40 3,283 Commercial mortgage-backed 1,952 76 24 16 1,988 Other asset-backed 2,281 71 7 2,345 Total asset-backed 7,448 255 71 16 7,616 U.S. Treasury and obligations of government-sponsored enterprises 138 1 7 132 Foreign government 508 23 2 529 Redeemable preferred stock 12 12 Fixed maturities available-for-sale 39,257 4,513 182 43 43,545 Fixed maturities trading 36 3 39 Total fixed maturity securities $ 39,293 $ 4,516 $ 182 $ 43 $ 43,584 December 31, 2020 Fixed maturity securities: Corporate and other bonds $ 20,792 $ 3,578 $ 22 $ 23 $ 24,325 States, municipalities and political subdivisions 9,729 1,863 11,592 Asset-backed: Residential mortgage-backed 3,442 146 1 3,587 Commercial mortgage-backed 1,933 93 42 17 1,967 Other asset-backed 2,179 81 9 2,251 Total asset-backed 7,554 320 52 17 7,805 U.S. Treasury and obligations of government-sponsored enterprises 339 2 3 338 Foreign government 512 32 544 Fixed maturities available-for-sale 38,926 5,795 77 40 44,604 Fixed maturities trading 37 5 42 Total fixed maturity securities $ 38,963 $ 5,800 $ 77 $ 40 $ 44,646 The net unrealized gains on available-for-sale investments included in the tables above are recorded as a component of Accumulated other comprehensive income (loss) (“AOCI”). When presented in AOCI, these amounts are net of tax and noncontrolling interests and any required Shadow Adjustments. To the extent that unrealized gains on fixed income securities supporting long term care products and structured settlements not funded by annuities would result in a premium deficiency if those gains were realized, a related increase in Insurance reserves is recorded, net of tax and noncontrolling interests, as a reduction of net unrealized gains through Other comprehensive income (loss) (“Shadow Adjustments”). As of March 31, 2021 and December 31, 2020, the net unrealized gains on investments included in AOCI were correspondingly reduced by Shadow Adjustments of $2.1 billion and $2.5 billion (after tax and noncontrolling interests). The available-for-sale securities in a gross unrealized loss position for which an allowance for credit losses has not been recorded are as follows: Less than 12 Months 12 Months or Longer Total March 31 2021 Estimated Fair Value Gross Unrealized Losses Estimated Fair Value Gross Unrealized Losses Estimated Fair Value Gross Unrealized Losses (In millions) Fixed maturity securities: Corporate and other bonds $ 1,868 $ 66 $ 82 $ 5 $ 1,950 $ 71 States, municipalities and political subdivisions 866 31 866 31 Asset-backed: Residential mortgage-backed 1,584 40 12 1,596 40 Commercial mortgage-backed 320 9 285 15 605 24 Other asset-backed 337 3 97 4 434 7 Total asset-backed 2,241 52 394 19 2,635 71 U.S. Treasury and obligations of government-sponsored enterprises 65 7 65 7 Foreign government 45 2 45 2 Total fixed maturity securities $ 5,085 $ 158 $ 476 $ 24 $ 5,561 $ 182 December 31, 2020 Fixed maturity securities: Corporate and other bonds $ 609 $ 21 $ 12 $ 1 $ 621 $ 22 States, municipalities and political subdivisions 33 33 Asset-backed: Residential mortgage-backed 71 1 11 82 1 Commercial mortgage-backed 533 40 28 2 561 42 Other asset-backed 344 9 13 357 9 Total asset-backed 948 50 52 2 1,000 52 U.S. Treasury and obligations of government-sponsored enterprises 63 3 63 3 Foreign government 13 13 Total fixed maturity securities $ 1,666 $ 74 $ 64 $ 3 $ 1,730 $ 77 Based on current facts and circumstances, the Company believes the unrealized losses presented in the March 31, 2021 securities in a gross unrealized loss position table above are not indicative of the ultimate collectability of the current amortized cost of the securities, but rather are attributable to changes in interest rates, credit spreads and other factors. There is no current intent to sell securities with unrealized losses, nor is it more likely than not that sale will be required prior to recovery of amortized cost; accordingly, it was determined that there are additional impairment losses to be recorded at March Contractual Maturity The following table presents available-for-sale fixed maturity securities by contractual maturity. March 31, 2021 December 31, 2020 Cost or Amortized Cost Estimated Fair Value Cost or Amortized Cost Estimated Fair Value (In millions) Due in one year or less $ 1,468 $ 1,473 $ 1,456 $ 1,458 Due after one year through five years 10,837 11,583 12,304 13,098 Due after five years through ten years 13,640 14,685 12,319 13,878 Due after ten years 13,312 15,804 12,847 16,170 Total $ 39,257 $ 43,545 $ 38,926 $ 44,604 Actual maturities may differ from contractual maturities because certain securities may be called or prepaid. Securities not due at a single date are allocated based on weighted average life. 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 (“LTV”) ratios: Mortgage Loans Amortized Cost Basis by Origination Year (a) As of March 31 2021 2021 2020 2019 2018 2017 Prior Total (In millions) DSCR ≥1.6x LTV less than 55% $ 75 $ 32 $ 36 $ 114 $ 187 $ 444 LTV 55% to 65% 14 20 14 15 11 74 LTV greater than 65% $ 5 5 24 34 DSCR 1.2x - 1.6x LTV less than 55% 16 5 77 98 LTV 55% to 65% 20 40 53 27 140 LTV greater than 65% 10 52 44 9 12 127 DSCR ≤1.2x LTV less than 55% 50 8 10 68 LTV 55% to 65% 48 48 LTV greater than 65% 29 7 36 Total $ 15 $ 161 $ 284 $ 103 $ 178 $ 328 $ 1,069 (a) The values in the table above reflect DSCR on a standardized amortization period and LTV ratios based on the most recent appraised values trended forward using changes in a commercial real estate price index. Derivative Financial Instruments A summary of the aggregate contractual or notional amounts and gross estimated fair values related to derivative financial instruments follows. The contractual or notional amounts for derivatives are used to calculate the exchange of contractual payments under related agreements and may not be representative of the potential for gain or loss on these instruments. Gross estimated fair values of derivative positions are currently presented in Equity securities, Receivables and Payable to brokers on the Consolidated Condensed Balance Sheets. March 31, 2021 December 31, 2020 Contractual/ Notional Estimated Fair Value Contractual/ Notional Estimated Fair Value Amount Asset (Liability) Amount Asset (Liability) (In millions) _ - With hedge designation: Interest rate swaps (a) $ 675 $ (26 ) Without hedge designation: Equity markets: Options – purchased $ 200 $ 2 _ 135 $ 3 Interest rate swaps 100 $ (2 ) 100 (3 ) Embedded derivative on funds withheld liability 256 (2 ) 190 (19 ) (a) As of March 31, 2021, Interest rate swaps exclude amounts classified as held for sale. See Note 2 for further discussion. Investment Commitments As part of the overall investment strategy, investments are made 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, 2021,

Fair Value

Fair Value	3 Months Ended
	Mar. 31, 2021
Fair Value [Abstract]
Fair Value	4. 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, securities are priced 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. Control procedures are performed 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) detailed analysis, where an independent analysis of the inputs and assumptions used to price individual securities is performed. Assets and liabilities measured at fair value on a recurring basis are summarized in the following tables. Corporate bonds and other includes obligations of the U.S. Treasury, government-sponsored enterprises, foreign governments and redeemable preferred stock. March 31, 2021 Level 1 Level 2 Level 3 Total (In millions) Fixed maturity securities: Corporate bonds and other $ 152 $ 23,410 $ 767 $ 24,329 States, municipalities and political subdivisions 11,556 44 11,600 Asset-backed 7,301 315 7,616 Fixed maturities available-for-sale 152 42,267 1,126 43,545 Fixed maturities trading 34 5 39 Total fixed maturities $ 152 $ 42,301 $ 1,131 $ 43,584 Equity securities $ 824 $ 711 $ 45 $ 1,580 Short term and other (a) 4,140 36 4,176 Payable to brokers (a) (71 ) (2 ) (73 ) (a) As of March 31, 2021, Short term and other and Payable to brokers exclude amounts classified as held for sale. See Note 2 for further discussion. December 31, 2020 Level 1 Level 2 Level 3 Total (In millions) Fixed maturity securities: Corporate bonds and other $ 355 $ 24,082 $ 770 $ 25,207 States, municipalities and political subdivisions 11,546 46 11,592 Asset-backed 7,497 308 7,805 Fixed maturities available-for-sale 355 43,125 1,124 44,604 Fixed maturities trading 34 8 42 Total fixed maturities $ 355 $ 43,159 $ 1,132 $ 44,646 Equity securities $ 796 $ 722 $ 43 $ 1,561 Short term and other 4,538 39 4,577 Payable to brokers (14 ) (29 ) (43 ) The following tables present reconciliations for all assets and liabilities measured at fair value on a recurring basis using significant unobservable inputs (Level 3) for the three months ended March 31, 2021 and 2020: Net Realized Investment Gains (Losses) and Net Change in Unrealized Investment Gains (Losses) Transfers Transfers Unrealized Gains (Losses) Recognized in Net Income (Loss) on Level 3 Assets and Liabilities Unrealized Gains (Losses) Recognized in Other Comprehensive Income (Loss) on Level 3 Assets and Liabilities 2021 Balance, January 1 Included in Net Income Included in OCI Purchases Sales Settlements into Level 3 out of Level 3 Balance, March 31 Held at March 31 Held at March 31 (In millions) Fixed maturity securities: Corporate bonds and other $ 770 $ (13 ) $ (40 ) $ 42 $ (2 ) $ 10 $ 767 $ (40 ) States, municipalities and political Subdivisions 46 (2 ) 44 (2 ) Asset-backed 308 2 (9 ) 30 (17 ) 9 $ (8 ) 315 (9 ) Fixed maturities available-for-sale 1,124 (11 ) (51 ) 72 $ - (19 ) 19 (8 ) 1,126 $ - (51 ) Fixed maturities trading 8 (3 ) 5 (3 ) Total fixed maturities $ 1,132 $ (14 ) $ (51 ) $ 72 $ - $ (19 ) $ 19 $ (8 ) $ 1,131 $ (3 ) $ (51 ) Equity securities $ 43 $ 2 $ 45 $ 2 Net Realized Investment Gains (Losses) and Net Change in Unrealized Investment Gains (Losses) Transfers Transfers Unrealized Gains (Losses) Recognized in Net Income (Loss) on Level 3 Assets and Liabilities Unrealized Gains (Losses) Recognized in Other Comprehensive Income (Loss) on Level 3 Assets and Liabilities 2020 Balance, January 1 Included in Net Income Included in OCI Purchases Sales Settlements into Level 3 out of Level 3 Balance, March 31 Held at March 31 Held at March 31 (In millions) Fixed maturity securities: Corporate bonds and other $ 468 $ (37 ) $ 67 $ (2 ) $ 496 $ (35 ) Asset-backed 165 (9 ) 45 (3 ) $ (1 ) 197 (9 ) Fixed maturities available-for-sale 633 $ - (46 ) 112 $ - (5 ) $ - (1 ) 693 $ - (44 ) Fixed maturities trading 4 (1 ) 3 (1 ) Total fixed maturities $ 637 $ (1 ) $ (46 ) $ 112 $ - $ (5 ) $ - $ (1 ) $ 696 $ (1 ) $ (44 ) Equity securities $ 19 $ (3 ) $ 16 $ (3 ) Net investment gains and losses are reported in Net income (loss) as follows: Major Category of Assets and Liabilities Consolidated Condensed Statements of Operations Line Items Fixed maturity securities available-for-sale Investment gains (losses) Fixed maturity securities trading Net investment income Equity securities Investment gains (losses) and Net investment income Other invested assets Investment gains (losses) and Net investment income Derivative financial instruments held in a trading portfolio Net investment income Derivative financial instruments, other Investment gains (losses) and Operating revenues and other Securities may be transferred in or out of levels within the fair value hierarchy based on the availability of observable market information and quoted prices used to determine the fair value of the security. The availability of observable market information and quoted prices varies based on market conditions and trading volume. 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 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. Derivative Financial Instruments Equity options are valued using quoted market prices and are classified within Level 1 of the fair value hierarchy. Over-the-counter derivatives, principally interest rate swaps, currency forwards, total return swaps, commodity swaps, equity warrants and options, are valued using inputs including broker/dealer quotes and are classified within Level 2 or Level 3 of the valuation hierarchy, depending on the amount of transparency as to whether these quotes are based on information that is observable in the marketplace. 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, treasury bills and exchange traded open-end funds valued using quoted market prices. Level 2 primarily includes commercial paper, 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 in the Consolidated Condensed Balance Sheets because certain short term investments, such as time deposits, are not measured at fair value. Significant Unobservable Inputs The following tables present quantitative information about the significant unobservable inputs utilized in the fair value measurement 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 unobservable inputs from these broker quotes is neither provided nor reasonably available. The weighted average rate is calculated based on fair value. March 31 2021 Estimated Fair Value Valuation Techniques Unobservable Inputs Range (Weighted Average) (In millions) Fixed maturity securities $ 936 Discounted cash flow Credit spread 1% – 8% (2%) December 31 2020 Fixed maturity securities $ 966 Discounted cash flow Credit spread 1% – 8% (3%) 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, estimated fair value and the level of the fair value hierarchy of the financial assets and liabilities which are not measured at fair value on the Consolidated Condensed Balance Sheets are presented in the following tables. The carrying amounts and estimated fair values of short term debt and long term debt exclude finance lease obligations. The carrying amounts reported on the Consolidated Condensed Balance Sheets for cash and short term investments not carried at fair value and certain other assets and liabilities approximate fair value due to the short term nature of these items. Carrying Estimated Fair Value March 31 2021 Amount Level 1 Level 2 Level 3 Total (In millions) - Assets: Other invested assets, primarily mortgage loans $ 1,043 $ 1,107 $ 1,107 Liabilities: Short term debt (a) 140 144 144 Long term debt (a) 8,990 $ 9,204 622 9,826 December 31 2020 Assets: Other invested assets, primarily mortgage loans $ 1,068 $ 1,151 $ 1,151 Liabilities: Short term debt 35 $ 19 17 36 Long term debt 10,042 10,482 765 11,247 (a) As of March 31, 2021, Short and Long term debt exclude amounts classified as held for sale. See Note 2 for further discussion.

Claim and Claim Adjustment Expe

Claim and Claim Adjustment Expense Reserves	3 Months Ended
	Mar. 31, 2021
Claim and Claim Adjustment Expense Reserves [Abstract]
Claim and Claim Adjustment Expense Reserves	5. Claim and Claim Adjustment Expense Reserves Property and casualty insurance 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. Reserve projections are based primarily on detailed analysis of the facts in each case, 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, as well as court decisions and economic conditions, including 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. 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 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 the Company’s results of operations and/or equity. The Company reported catastrophe losses, net of reinsurance, of $125 million and $75 million for the three months ended March 31, 2021 and 2020. Net catastrophe losses for the three months ended March 31, 2021 were primarily driven by Winter Storms Uri and Viola. Net catastrophe losses for the three months ended March 31, 2020 included $13 million related to the coronavirus (“COVID-19”) pandemic, with the remaining $62 million related primarily to U.S. 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, including claim and claim adjustment expense reserves of other insurance operations. Three Months Ended March 31 2021 2020 (In millions) Reserves, beginning of year: Gross $ 22,706 $ 21,720 Ceded 4,005 3,835 Net reserves, beginning of year 18,701 17,885 Reduction of net reserves due to the excess workers’ compensation loss portfolio transfer (632 ) Net incurred claim and claim adjustment expenses: Provision for insured events of current year 1,474 1,355 Increase (decrease) in provision for insured events of prior years (54 ) (8 ) Amortization of discount 50 51 Total net incurred (a) 1,470 1,398 Net payments attributable to: Current year events (85 ) (72 ) Prior year events (1,067 ) (1,218 ) Total net payments (1,152 ) (1,290 ) Foreign currency translation adjustment and other (32 ) (88 ) Net reserves, end of period 18,355 17,905 Ceded reserves, end of period 4,701 3,967 Gross reserves, end of period $ 23,056 $ 21,872 (a) Total net incurred above does not agree to Insurance claims and policyholders’ benefits as reflected on the Consolidated Condensed Statements of Operations due to amounts related to retroactive reinsurance deferred gain accounting, the loss on the excess workers’ compensation loss portfolio transfer, uncollectible reinsurance and benefit expenses related to future policy benefits, 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. These changes can be favorable or unfavorable. Favorable net prior year development of $15 million was recorded for commercial property and casualty operations (“Property & Casualty Operations”) for the three months ended March 31, 2021 and 2020. The following table and discussion present details of the net prior year claim and claim adjustment expense reserve development in Property & Casualty Operations: Three Months Ended March 31 2021 2020 (In millions) Medical professional liability $ 8 $ 10 Other professional liability and management liability 3 Surety (15 ) (30 ) Commercial auto 9 Workers’ compensation (13 ) Property and other (8 ) 6 Total pretax (favorable) unfavorable development $ (15 ) $ (15 ) 2021 Favorable development in surety was primarily due to lower than expected frequency and lack of systemic activity in recent accident years. 2020 Unfavorable development in medical professional liability was primarily due to unfavorable outcomes on specific claims in accident years 2015 and 2016 in the aging services business. Favorable development in surety was primarily due to lower than expected frequency for accident years 2017 and prior. Favorable development in workers’ compensation was due to favorable medical trends driving lower than expected severity in accident years 2016 through 2018. Asbestos & Environmental Pollution (“A&EP”) Reserves In 2010, Continental Casualty Company (“CCC”) together with several insurance subsidiaries completed a transaction with National Indemnity Company (“NICO”), a subsidiary of Berkshire Hathaway Inc., under which substantially all of the legacy A&EP liabilities were ceded to NICO through a loss portfolio transfer (“LPT”). At the effective date of the transaction, approximately $1.6 billion of net A&EP claim and allocated claim adjustment expense reserves were ceded to NICO under a retroactive reinsurance agreement with an aggregate limit of $4.0 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. NICO was paid a reinsurance premium of $2.0 billion and billed third party reinsurance receivables related to A&EP claims with a net book value of $215 million were transferred to NICO, resulting in total consideration of $2.2 billion. In years subsequent to the effective date of the LPT, adverse prior year development on A&EP reserves was recognized 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 a change in the estimate of A&EP reserves is recognized 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 on the Consolidated Condensed Statements of Operations. The impact of the LPT on the Consolidated Condensed Statements of Operations was the recognition of a retroactive reinsurance benefit of and for the months ended March and As of March 31, 2021 and December 31, 2020, the cumulative amounts ceded under the LPT were $ billion. The unrecognized deferred retroactive reinsurance benefit was $ million and $ million as of March 31, 2021 and December 31, 2020 and is included within Other liabilities on the Consolidated Condensed Balance Sheets. NICO established a collateral trust account as security for its obligations under the LPT. The fair value of the collateral trust account was $4.6 billion and $4.2 billion as of March 31, 2021 and December 31, 2020. 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. Excess Workers’ Compensation LPT On February 5, 2021, CNA completed a transaction with Cavello Bay Reinsurance Limited (“Cavello”), a subsidiary of Enstar Group Limited, under which certain legacy excess workers’ compensation (“EWC”) liabilities were ceded to Cavello. Under the terms of the transaction, based on reserves in place as of January 1, 2020, approximately $690 million of net EWC claim and allocated claim adjustment expense reserves were ceded to Cavello under a loss portfolio transfer (“EWC LPT”) with an aggregate limit of $1.0 billion. Cavello was paid a reinsurance premium of $697 million, less claims paid between January 1, 2020 and the closing date of the agreement of $64 million. After transaction costs, a loss of approximately $11 million (after tax and noncontrolling interest) was recognized in the Other Insurance Operations business for the three months ended March 31, 2021 related to the EWC LPT. Cavello established a collateral trust account as security for its obligations, which will be maintained at 105% of outstanding reserves. As of March 31, 2021, the remaining amount available under the $1.0 billion aggregate limit of the EWC LPT was $310 million on an incurred basis. Credit Risk for Ceded Reserves The majority of CNA’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.

Debt

Debt	3 Months Ended
	Mar. 31, 2021
Debt [Abstract]
Debt	6. Debt On February 3, 2021, Altium Packaging entered into a $ billion secured term loan. The term loan is a variable rate facility which bears interest at a floating rate equal to the London Interbank Offered Rate (“LIBOR”) plus an applicable margin of , subject to a LIBOR floor. The proceeds were used to pay the outstanding principal balances of its variable rate term loans and lending facility and a dividend of $ million

Shareholders' Equity

Shareholders' Equity	3 Months Ended
	Mar. 31, 2021
Shareholders' Equity [Abstract]
Shareholders' Equity	7. Shareholders’ Equity Accumulated other comprehensive income (loss) The tables below present the changes in AOCI by component for the three months ended March 31, 2020 and 2021: Net Unrealized Gains (Losses) on Investments with an Allowance for Credit Losses Net Unrealized Gains (Losses) on Other Investments Unrealized Gains (Losses) on Cash Flow Hedges Pension and Postretirement Benefits Foreign Currency Translation Total Accumulated Other Comprehensive Income (Loss) (In millions) Balance, January 1, 2020 $ - $ 918 $ (6 ) $ (855 ) $ (125 ) $ (68 ) Other comprehensive income (loss) before reclassifications, after tax of $ 13 287 6 0 0 (48 ) (1,066 ) (19 ) 1 (84 ) (1,216 ) Reclassification of losses from accumulated other comprehensive income, after tax of $( 10 6 0 3 0 37 22 13 72 Other comprehensive income (loss) (11 ) (1,044 ) (19 ) 14 (84 ) (1,144 ) Amounts attributable to noncontrolling interests 1 111 (1 ) 8 119 Balance, March 31, 2020 $ (10 ) $ (15 ) $ (25 ) $ (842 ) $ (201 ) $ (1,093 ) Balance, January 1, 2021 $ - $ 1,563 $ (23 ) $ (877 ) $ (82 ) $ 581 Other comprehensive income (loss) before reclassifications, after tax of $ 1 154 2 0 0 (3 ) (593 ) 3 3 (590 ) Reclassification of (gains) losses from accumulated other comprehensive income, after tax of $ 1 , $ 8 , $ 1 , $ 2 and $ 0 3 (34 ) 1 9 (21 ) Other comprehensive income (loss) - (627 ) 4 9 3 (611 ) Amounts attributable to noncontrolling interests 66 (1 ) (1 ) 64 Balance, March 31, 2021 $ - $ 1,002 $ (19 ) $ (869 ) $ (80 ) $ 34 Amounts reclassified from AOCI shown above are reported in Net income (loss) as follows: Major Category of AOCI Affected Line Item Net unrealized gains (losses) on investments with an allowance for credit losses, Net unrealized gains (losses) on investments with OTTI losses, and Net unrealized gains (losses) on other investments Investment gains (losses) Unrealized gains (losses) on cash flow hedges Operating revenues and other, Interest expense and Operating expenses and other Pension and postretirement benefits Operating expenses and other Treasury Stock Loews Corporation repurchased million and million shares of its common stock at an aggregate cost of $ million and $ million during the three months ended and .

Revenue from Contracts with Cus

Revenue from Contracts with Customers	3 Months Ended
	Mar. 31, 2021
Revenue from Contracts with Customers [Abstract]
Revenue from Contracts with Customers	8. Revenue from Contracts with Customers Disaggregation of revenues – Three Months Ended March 31 2021 2020 (In millions) Non-insurance warranty - CNA Financial $ 338 $ 301 Transportation and storage of natural gas and NGLs and other services - Boardwalk Pipelines 361 332 Lodging and related services - Loews Hotels & Co 56 142 Rigid plastic packaging and recycled resin – Corporate 280 256 Contract drilling – Diamond Offshore 229 Total revenues from contracts with customers 697 959 Other revenues 18 23 Operating revenues and other $ 715 $ 982 Receivables from contracts with customers Deferred revenue Performance obligations 2022

Benefit Plans

Benefit Plans	3 Months Ended
	Mar. 31, 2021
Benefit Plans [Abstract]
Benefit Plans	9. Benefit Plans The Company has several non-contributory defined benefit plans and postretirement benefit plans covering eligible employees and retirees. The following table presents the components of net periodic benefit for these plans: Pension Benefits Other Postretirement Benefits Three Months Ended March 31 2021 2020 2021 2020 (In millions) Service cost $ 1 $ 1 Interest cost 18 23 Expected return on plan assets (43 ) (43 ) $ (1 ) $ (1 ) Amortization of unrecognized net loss 12 11 Settlement charge 4 Net periodic benefit $ (12 ) $ (4 ) $ (1 ) $ (1 )

Legal Proceedings

Legal Proceedings	3 Months Ended
	Mar. 31, 2021
Legal Proceedings [Abstract]
Legal Proceedings	10. Legal Proceedings On May 25, 2018, plaintiffs Tsemach Mishal and Paul Berger (on behalf of themselves and the purported class, “Plaintiffs”) initiated a purported class action in the Court of Chancery of the State of Delaware (the “Court”) against the following defendants: Boardwalk Pipelines, Boardwalk GP, LP (“General Partner”), Boardwalk GP, LLC and Boardwalk Pipelines Holding Corp. (“BPHC”) (together, “Defendants”), regarding the potential exercise by the General Partner of its right to purchase all of the issued and outstanding common units representing limited partnership interests in Boardwalk Pipelines not already owned by the General Partner or its affiliates. On June 25, 2018, Plaintiffs and Defendants entered into a Stipulation and Agreement of Compromise and Settlement, subject to the approval of the Court (the “Proposed Settlement”). Under the terms of the Proposed Settlement, the lawsuit would be dismissed, and related claims against the Defendants would be released by the Plaintiffs, if BPHC, the sole member of the General Partner, elected to cause the General Partner to exercise its right to purchase the issued and outstanding common units of Boardwalk Pipelines pursuant to Boardwalk Pipelines’ Third Amended and Restated Agreement of Limited Partnership, as amended (“Limited Partnership Agreement”), within a period specified by the Proposed Settlement. On June 29, 2018, the General Partner elected to exercise its right to purchase all of the issued and outstanding common units representing limited partnership interests in Boardwalk Pipelines not already owned by the General Partner or its affiliates pursuant to the Limited Partnership Agreement within the period specified by the Proposed Settlement. The transaction was completed on July 18, 2018. On September 28, 2018, the Court denied approval of the Proposed Settlement. On February 11, 2019, a substitute verified class action complaint was filed in this proceeding. The Defendants filed a motion to dismiss, which was heard by the Court in July of 2019. In October of 2019, the Court ruled on the motion and granted a partial dismissal, with certain aspects of the case proceeding to trial. A trial was held the week of February 22, 2021 and post-trial oral arguments are scheduled for July 14, 2021 The Company is from time to time party to other litigation arising in the ordinary course of business. While it is difficult to predict the outcome or effect of any litigation, management does not believe that the outcome of any pending litigation, including the Boardwalk Pipelines matter described above, will materially affect the Company’s results of operations or equity.

Commitments and Contingencies

Commitments and Contingencies	3 Months Ended
	Mar. 31, 2021
Commitments and Contingencies [Abstract]
Commitments and Contingencies	11. Commitments and Contingencies CNA Guarantees CNA 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, 2021, the potential amount of future payments CNA could be required to pay under these guarantees was approximately $1.6 billion, which will be paid over the lifetime of the annuitants. CNA does not believe any payment is likely under these guarantees, as CNA is the beneficiary of a trust that must be maintained at a level that approximates the discounted reserves for these annuities.

Segments

Segments	3 Months Ended
	Mar. 31, 2021
Segments [Abstract]
Segments	12. Segments Loews Corporation has reportable segments comprised of individual consolidated operating subsidiaries, CNA, Boardwalk Pipelines and Loews Hotels & Co; and the Corporate segment. In the first quarter of 2020 Diamond Offshore was a reportable segment. The Corporate segment is primarily comprised of Loews Corporation excluding its subsidiaries and the operations of Altium Packaging. Diamond Offshore was deconsolidated during the second quarter of 2020. Each of the operating subsidiaries and Diamond Offshore are headed by a chief executive officer who is responsible for the operation of its business and has the duties and authority commensurate with that position. For additional disclosures regarding the composition of ’s segments, see Note 20 of the Consolidated Financial Statements in the Company’s Annual Report on Form 10-K for the year ended December 31, 2020. The following tables present the reportable segments and their contribution to the Consolidated Condensed Statements of Operations. Amounts presented will not necessarily be the same as those in the individual financial statements of the subsidiaries due to adjustments for purchase accounting, income taxes and noncontrolling interests. Statements of Operations by segment are presented in the following tables. Three Months Ended March 31, 2021 CNA Financial Boardwalk Pipelines Loews Hotels & Co Corporate Total (In millions) Revenues: Insurance premiums $ 1,962 $ 1,962 Net investment income 504 $ 46 550 Investment gains 57 57 Non-insurance warranty revenue 338 338 Operating revenues and other 5 $ 372 $ 57 281 715 Total 2,866 372 57 327 3,622 Expenses: Insurance claims and policyholders’ benefits 1,506 1,506 Amortization of deferred acquisition costs 359 359 Non-insurance warranty expense 311 311 Operating expenses and other 285 217 104 308 914 Interest 28 41 8 48 125 Total 2,489 258 112 356 3,215 Income (loss) before income tax 377 114 (55 ) (29 ) 407 Income tax (expense) benefit (66 ) (29 ) 12 (31 ) (114 ) Net income (loss) 311 85 (43 ) (60 ) 293 Amounts attributable to noncontrolling interests (32 ) (32 ) Net income (loss) attributable to Loews Corporation $ 279 $ 85 $ (43 ) $ (60 ) $ 261 Three Months Ended March 31, 2020 CNA Financial Boardwalk Pipelines Loews Hotels & Co Corporate Diamond Offshore Total (In millions) Revenues: Insurance premiums $ 1,869 $ 1,869 Net investment income (loss) 329 $ (166 ) 163 Investment losses (216 ) (216 ) Non-insurance warranty revenue 301 301 Operating revenues and other 8 $ 341 $ 142 257 $ 234 982 Total 2,291 341 142 91 234 3,099 Expenses: Insurance claims and policyholders’ benefits 1,425 1,425 Amortization of deferred acquisition costs 344 344 Non-insurance warranty expense 281 281 Operating expenses and other 300 211 167 268 1,080 2,026 Interest 31 42 8 31 32 144 Total 2,381 253 175 299 1,112 4,220 Income (loss) before income tax (90 ) 88 (33 ) (208 ) (878 ) (1,121 ) Income tax (expense) benefit 28 (23 ) 8 43 21 77 Net income (loss) (62 ) 65 (25 ) (165 ) (857 ) (1,044 ) Amounts attributable to noncontrolling interests 7 405 412 Net income (loss) attributable to Loews Corporation $ (55 ) $ 65 $ (25 ) $ (165 ) $ (452 ) $ (632 )

Basis of Presentation (Policies

Basis of Presentation (Policies)	3 Months Ended
	Mar. 31, 2021
Basis of Presentation [Abstract]
Basis of Presentation	Loews Corporation is a holding company. Its subsidiaries are engaged in the following lines of business: commercial property and casualty insurance (CNA Financial Corporation (“CNA”), an owned subsidiary); transportation and storage of natural gas and natural gas liquids (Boardwalk Pipeline Partners, LP (“Boardwalk Pipelines”), a wholly owned subsidiary); the operation of a chain of hotels (Loews Hotels Holding Corporation (“Loews Hotels & Co”), a wholly owned subsidiary); and the manufacture of rigid plastic packaging solutions (Altium Packaging LLC (“Altium Packaging”), a owned subsidiary). Unless the context otherwise requires, the term “Company” as used herein means Loews Corporation including its subsidiaries, the term “Net income (loss) attributable to Loews Corporation” as used herein means Net income (loss) attributable to Loews Corporation shareholders On April 1, 2021, Loews Corporation sold 47% of its interest in Altium Packaging. See Note 2 for further discussion. As a result of the April 26, 2020 bankruptcy filing of Diamond Offshore Drilling, Inc. (“Diamond Offshore”) and certain of its subsidiaries and applicable accounting principles generally accepted in the United States of America (“GAAP”), Diamond Offshore was deconsolidated from Loews Corporation’s consolidated financial statements in the second quarter of 2020. Loews Corporation’s operating results for the first quarter of 2020 include the operations of Diamond Offshore. During the first quarter of 2020, Diamond Offshore recorded an aggregate asset impairment charge of $774 million ($408 million after tax and noncontrolling interests), which is reported within Operating expenses and other on the Consolidated Condensed Statements of Operations. For additional information regarding the deconsolidation of Diamond Offshore and the Diamond Offshore asset impairments, see Notes 2 and 6 of the Consolidated Financial Statements in the Company’s Annual Report on Form 10-K for the year ended December 31, 2020. In the opinion of management, the accompanying unaudited Consolidated Condensed Financial Statements reflect all adjustments (consisting of normal recurring accruals) necessary to present fairly the Company’s financial position as of March 31, 2021 and December 31, 2020 and results of operations, comprehensive loss and changes in shareholders’ equity and cash flows for the three months ended March 31, 2021 and 2020. Net income (loss) for the first quarter of each of the years is not necessarily indicative of net income (loss) for that entire year. These Consolidated Condensed Financial Statements should be read in conjunction with the Consolidated Financial Statements in the Company’s Annual Report on Form 10-K for the year ended December 31, 2020.
Income (Loss) per Share	The Company presents basic and diluted net income (loss) per share on the Consolidated Condensed Statements of Operations. Basic net income (loss) per share excludes dilution and is computed by dividing net income (loss) attributable to common stock by the weighted average number of common shares outstanding for the period. Diluted net income 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. For the three months ended March 31, 2021 there were no shares attributable to employee stock-based compensation awards excluded from the diluted weighted average shares outstanding amounts because the effect would have been antidilutive.
Recently Issued ASUs	Recently issued ASUs – In August of 2018 the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) 2018-12 “Financial Services – Insurance (Topic 944 : Targeted Improvements to the Accounting for Long-Duration Contracts.” The updated accounting guidance requires changes to the measurement and disclosure of long-duration contracts. The guidance requires entities to update annually cash flow assumptions, including morbidity and persistency, and update quarterly discount rate assumptions using an upper-medium grade fixed-income instrument yield. The effect of changes in cash flow assumptions will be recorded in Net income and the effect of changes in discount rate assumptions will be recorded in Other comprehensive income (“OCI”).

Investments (Tables)

Investments (Tables)	3 Months Ended
	Mar. 31, 2021
Investments [Abstract]
Net Investment Income	Net investment income is as follows: Three Months Ended March 31 2021 2020 (In millions) Fixed maturity securities $ 428 $ 438 Limited partnership investments 47 (102 ) Short term investments 7 Equity securities 29 (44 ) Income (loss) from trading portfolio (a) 50 (129 ) Other 16 14 Total investment income 570 184 Investment expenses (20 ) (21 ) Net investment income $ 550 $ 163 (a) Net unrealized gains (losses) related to changes in fair value on securities still held were $32 and $(117) for the three months ended March 31, 2021 and 2020.
Investment Gains (Losses)	Investment gains (losses) are as follows: Three Months Ended March 31 2021 2020 (In millions) Fixed maturity securities $ 38 $ (75 ) Equity securities 2 (133 ) Derivative instruments 17 5 Short term investments and other (13 ) Investment gains (losses) (a) $ 57 $ (216 ) (a) Gross investment gains on available-for-sale securities were $ and $ for the three months ended March 31, 2021 and 2020. Gross investment losses on available-for-sale securities were $ and $ for the three months ended March 31, 2021 and 2020. During the three months ended March 31, 2021 and 2020, $ of investment gains and of investment losses were recognized due to the change in fair value of non-redeemable preferred stock still held as of March and .
Allowance for Credit Losses	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 receivables on available-for-sale fixed maturity securities totaled $ million, $ million and as of March 31, 2021, December 31, 2020 and March 31, 2020 and are excluded from the estimate of expected credit losses and the amortized cost basis in the tables within this Note. Three months ended March 31, 2021 Corporate and Other Bonds Asset-backed Total (In millions) Allowance for credit losses: Balance as of January 1, 2021 $ 23 $ 17 $ 40 Additions to the allowance for credit losses: Securities for which credit losses were not previously recorded 14 14 Available-for-sale securities accounted for as PCD assets 2 2 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 Additional decreases to the allowance for credit losses on securities that had an allowance recorded in a previous period (6 ) (1 ) (7 ) Total allowance for credit losses $ 27 $ 16 $ 43 Three months ended March 31, 2020 Allowance for credit losses: Balance as of January 1, 2020 $ - $ - $ - Additions to the allowance for credit losses: Impact of adopting ASC 326 6 6 Securities for which credit losses were not previously recorded 48 48 Available-for-sale securities accounted for as PCD assets 1 1 Reductions to the allowance for credit losses: Securities sold during the period (realized) 5 5 Intent to sell or more likely than not will be required to sell the security before recovery of its amortized cost basis 1 1 Total allowance for credit losses $ 49 $ - $ 49
Available-for-Sale Impairment Losses Recognized in Earnings	The components of available-for-sale impairment losses recognized in earnings by asset type are presented in the following table. The table includes losses on securities with an intention to sell and changes in the allowance for credit losses on securities since acquisition date: Three Months Ended March 31 2021 2020 (In millions) Fixed maturity securities available-for-sale: Corporate and other bonds $ 7 $ 91 Asset-backed (1 ) 1 Impairment losses recognized in earnings $ 6 $ 92
Amortized Cost and Fair Values of Fixed Maturity Securities	The amortized cost and fair values of fixed maturity securities are as follows: March 31 2021 Cost or Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Allowance for Credit Losses Estimated Fair Value (In millions) Fixed maturity securities: Corporate and other bonds $ 21,110 $ 2,644 $ 71 $ 27 $ 23,656 States, municipalities and political subdivisions 10,041 1,590 31 11,600 Asset-backed: Residential mortgage-backed 3,215 108 40 3,283 Commercial mortgage-backed 1,952 76 24 16 1,988 Other asset-backed 2,281 71 7 2,345 Total asset-backed 7,448 255 71 16 7,616 U.S. Treasury and obligations of government-sponsored enterprises 138 1 7 132 Foreign government 508 23 2 529 Redeemable preferred stock 12 12 Fixed maturities available-for-sale 39,257 4,513 182 43 43,545 Fixed maturities trading 36 3 39 Total fixed maturity securities $ 39,293 $ 4,516 $ 182 $ 43 $ 43,584 December 31, 2020 Fixed maturity securities: Corporate and other bonds $ 20,792 $ 3,578 $ 22 $ 23 $ 24,325 States, municipalities and political subdivisions 9,729 1,863 11,592 Asset-backed: Residential mortgage-backed 3,442 146 1 3,587 Commercial mortgage-backed 1,933 93 42 17 1,967 Other asset-backed 2,179 81 9 2,251 Total asset-backed 7,554 320 52 17 7,805 U.S. Treasury and obligations of government-sponsored enterprises 339 2 3 338 Foreign government 512 32 544 Fixed maturities available-for-sale 38,926 5,795 77 40 44,604 Fixed maturities trading 37 5 42 Total fixed maturity securities $ 38,963 $ 5,800 $ 77 $ 40 $ 44,646
Available-for-Sale Securities in Gross Unrealized Loss Position	The available-for-sale securities in a gross unrealized loss position for which an allowance for credit losses has not been recorded are as follows: Less than 12 Months 12 Months or Longer Total March 31 2021 Estimated Fair Value Gross Unrealized Losses Estimated Fair Value Gross Unrealized Losses Estimated Fair Value Gross Unrealized Losses (In millions) Fixed maturity securities: Corporate and other bonds $ 1,868 $ 66 $ 82 $ 5 $ 1,950 $ 71 States, municipalities and political subdivisions 866 31 866 31 Asset-backed: Residential mortgage-backed 1,584 40 12 1,596 40 Commercial mortgage-backed 320 9 285 15 605 24 Other asset-backed 337 3 97 4 434 7 Total asset-backed 2,241 52 394 19 2,635 71 U.S. Treasury and obligations of government-sponsored enterprises 65 7 65 7 Foreign government 45 2 45 2 Total fixed maturity securities $ 5,085 $ 158 $ 476 $ 24 $ 5,561 $ 182 December 31, 2020 Fixed maturity securities: Corporate and other bonds $ 609 $ 21 $ 12 $ 1 $ 621 $ 22 States, municipalities and political subdivisions 33 33 Asset-backed: Residential mortgage-backed 71 1 11 82 1 Commercial mortgage-backed 533 40 28 2 561 42 Other asset-backed 344 9 13 357 9 Total asset-backed 948 50 52 2 1,000 52 U.S. Treasury and obligations of government-sponsored enterprises 63 3 63 3 Foreign government 13 13 Total fixed maturity securities $ 1,666 $ 74 $ 64 $ 3 $ 1,730 $ 77
Available-for-Sale Fixed Maturity Securities by Contractual Maturity	The following table presents available-for-sale fixed maturity securities by contractual maturity. March 31, 2021 December 31, 2020 Cost or Amortized Cost Estimated Fair Value Cost or Amortized Cost Estimated Fair Value (In millions) Due in one year or less $ 1,468 $ 1,473 $ 1,456 $ 1,458 Due after one year through five years 10,837 11,583 12,304 13,098 Due after five years through ten years 13,640 14,685 12,319 13,878 Due after ten years 13,312 15,804 12,847 16,170 Total $ 39,257 $ 43,545 $ 38,926 $ 44,604
Amortized Cost Basis of Mortgage Loans for Each Credit Quality Indicator by Year of Origination	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 (“LTV”) ratios: Mortgage Loans Amortized Cost Basis by Origination Year (a) As of March 31 2021 2021 2020 2019 2018 2017 Prior Total (In millions) DSCR ≥1.6x LTV less than 55% $ 75 $ 32 $ 36 $ 114 $ 187 $ 444 LTV 55% to 65% 14 20 14 15 11 74 LTV greater than 65% $ 5 5 24 34 DSCR 1.2x - 1.6x LTV less than 55% 16 5 77 98 LTV 55% to 65% 20 40 53 27 140 LTV greater than 65% 10 52 44 9 12 127 DSCR ≤1.2x LTV less than 55% 50 8 10 68 LTV 55% to 65% 48 48 LTV greater than 65% 29 7 36 Total $ 15 $ 161 $ 284 $ 103 $ 178 $ 328 $ 1,069 (a) The values in the table above reflect DSCR on a standardized amortization period and LTV ratios based on the most recent appraised values trended forward using changes in a commercial real estate price index.
Aggregate Contractual or Notional Amounts and Estimated Fair Values Related to Derivative Financial Instruments	A summary of the aggregate contractual or notional amounts and gross estimated fair values related to derivative financial instruments follows. The contractual or notional amounts for derivatives are used to calculate the exchange of contractual payments under related agreements and may not be representative of the potential for gain or loss on these instruments. Gross estimated fair values of derivative positions are currently presented in Equity securities, Receivables and Payable to brokers on the Consolidated Condensed Balance Sheets. March 31, 2021 December 31, 2020 Contractual/ Notional Estimated Fair Value Contractual/ Notional Estimated Fair Value Amount Asset (Liability) Amount Asset (Liability) (In millions) _ - With hedge designation: Interest rate swaps (a) $ 675 $ (26 ) Without hedge designation: Equity markets: Options – purchased $ 200 $ 2 _ 135 $ 3 Interest rate swaps 100 $ (2 ) 100 (3 ) Embedded derivative on funds withheld liability 256 (2 ) 190 (19 ) (a) As of March 31, 2021, Interest rate swaps exclude amounts classified as held for sale. See Note 2 for further discussion.

Fair Value (Tables)

Fair Value (Tables)	3 Months Ended
	Mar. 31, 2021
Fair Value [Abstract]
Assets and Liabilities Measured at Fair Value on Recurring Basis	Assets and liabilities measured at fair value on a recurring basis are summarized in the following tables. Corporate bonds and other includes obligations of the U.S. Treasury, government-sponsored enterprises, foreign governments and redeemable preferred stock. March 31, 2021 Level 1 Level 2 Level 3 Total (In millions) Fixed maturity securities: Corporate bonds and other $ 152 $ 23,410 $ 767 $ 24,329 States, municipalities and political subdivisions 11,556 44 11,600 Asset-backed 7,301 315 7,616 Fixed maturities available-for-sale 152 42,267 1,126 43,545 Fixed maturities trading 34 5 39 Total fixed maturities $ 152 $ 42,301 $ 1,131 $ 43,584 Equity securities $ 824 $ 711 $ 45 $ 1,580 Short term and other (a) 4,140 36 4,176 Payable to brokers (a) (71 ) (2 ) (73 ) (a) As of March 31, 2021, Short term and other and Payable to brokers exclude amounts classified as held for sale. See Note 2 for further discussion. December 31, 2020 Level 1 Level 2 Level 3 Total (In millions) Fixed maturity securities: Corporate bonds and other $ 355 $ 24,082 $ 770 $ 25,207 States, municipalities and political subdivisions 11,546 46 11,592 Asset-backed 7,497 308 7,805 Fixed maturities available-for-sale 355 43,125 1,124 44,604 Fixed maturities trading 34 8 42 Total fixed maturities $ 355 $ 43,159 $ 1,132 $ 44,646 Equity securities $ 796 $ 722 $ 43 $ 1,561 Short term and other 4,538 39 4,577 Payable to brokers (14 ) (29 ) (43 )
Reconciliations of Assets and Liabilities Measured at Fair Value on Recurring Basis Using Significant Unobservable Inputs	The following tables present reconciliations for all assets and liabilities measured at fair value on a recurring basis using significant unobservable inputs (Level 3) for the three months ended March 31, 2021 and 2020: Net Realized Investment Gains (Losses) and Net Change in Unrealized Investment Gains (Losses) Transfers Transfers Unrealized Gains (Losses) Recognized in Net Income (Loss) on Level 3 Assets and Liabilities Unrealized Gains (Losses) Recognized in Other Comprehensive Income (Loss) on Level 3 Assets and Liabilities 2021 Balance, January 1 Included in Net Income Included in OCI Purchases Sales Settlements into Level 3 out of Level 3 Balance, March 31 Held at March 31 Held at March 31 (In millions) Fixed maturity securities: Corporate bonds and other $ 770 $ (13 ) $ (40 ) $ 42 $ (2 ) $ 10 $ 767 $ (40 ) States, municipalities and political Subdivisions 46 (2 ) 44 (2 ) Asset-backed 308 2 (9 ) 30 (17 ) 9 $ (8 ) 315 (9 ) Fixed maturities available-for-sale 1,124 (11 ) (51 ) 72 $ - (19 ) 19 (8 ) 1,126 $ - (51 ) Fixed maturities trading 8 (3 ) 5 (3 ) Total fixed maturities $ 1,132 $ (14 ) $ (51 ) $ 72 $ - $ (19 ) $ 19 $ (8 ) $ 1,131 $ (3 ) $ (51 ) Equity securities $ 43 $ 2 $ 45 $ 2 Net Realized Investment Gains (Losses) and Net Change in Unrealized Investment Gains (Losses) Transfers Transfers Unrealized Gains (Losses) Recognized in Net Income (Loss) on Level 3 Assets and Liabilities Unrealized Gains (Losses) Recognized in Other Comprehensive Income (Loss) on Level 3 Assets and Liabilities 2020 Balance, January 1 Included in Net Income Included in OCI Purchases Sales Settlements into Level 3 out of Level 3 Balance, March 31 Held at March 31 Held at March 31 (In millions) Fixed maturity securities: Corporate bonds and other $ 468 $ (37 ) $ 67 $ (2 ) $ 496 $ (35 ) Asset-backed 165 (9 ) 45 (3 ) $ (1 ) 197 (9 ) Fixed maturities available-for-sale 633 $ - (46 ) 112 $ - (5 ) $ - (1 ) 693 $ - (44 ) Fixed maturities trading 4 (1 ) 3 (1 ) Total fixed maturities $ 637 $ (1 ) $ (46 ) $ 112 $ - $ (5 ) $ - $ (1 ) $ 696 $ (1 ) $ (44 ) Equity securities $ 19 $ (3 ) $ 16 $ (3 ) Net investment gains and losses are reported in Net income (loss) as follows: Major Category of Assets and Liabilities Consolidated Condensed Statements of Operations Line Items Fixed maturity securities available-for-sale Investment gains (losses) Fixed maturity securities trading Net investment income Equity securities Investment gains (losses) and Net investment income Other invested assets Investment gains (losses) and Net investment income Derivative financial instruments held in a trading portfolio Net investment income Derivative financial instruments, other Investment gains (losses) and Operating revenues and other
Significant Unobservable Inputs	The following tables present quantitative information about the significant unobservable inputs utilized in the fair value measurement 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 unobservable inputs from these broker quotes is neither provided nor reasonably available. The weighted average rate is calculated based on fair value. March 31 2021 Estimated Fair Value Valuation Techniques Unobservable Inputs Range (Weighted Average) (In millions) Fixed maturity securities $ 936 Discounted cash flow Credit spread 1% – 8% (2%) December 31 2020 Fixed maturity securities $ 966 Discounted cash flow Credit spread 1% – 8% (3%)
Financial Assets and Liabilities Not Measured at Fair Value	The carrying amount, estimated fair value and the level of the fair value hierarchy of the financial assets and liabilities which are not measured at fair value on the Consolidated Condensed Balance Sheets are presented in the following tables. The carrying amounts and estimated fair values of short term debt and long term debt exclude finance lease obligations. The carrying amounts reported on the Consolidated Condensed Balance Sheets for cash and short term investments not carried at fair value and certain other assets and liabilities approximate fair value due to the short term nature of these items. Carrying Estimated Fair Value March 31 2021 Amount Level 1 Level 2 Level 3 Total (In millions) - Assets: Other invested assets, primarily mortgage loans $ 1,043 $ 1,107 $ 1,107 Liabilities: Short term debt (a) 140 144 144 Long term debt (a) 8,990 $ 9,204 622 9,826 December 31 2020 Assets: Other invested assets, primarily mortgage loans $ 1,068 $ 1,151 $ 1,151 Liabilities: Short term debt 35 $ 19 17 36 Long term debt 10,042 10,482 765 11,247 (a) As of March 31, 2021, Short and Long term debt exclude amounts classified as held for sale. See Note 2 for further discussion.

Claim and Claim Adjustment Ex_2

Claim and Claim Adjustment Expense Reserves (Tables)	3 Months Ended
	Mar. 31, 2021
Claim and Claim Adjustment Expense Reserves [Abstract]
Reconciliation of Claim and Claim Adjustment Expense Reserves	The following table presents a reconciliation between beginning and ending claim and claim adjustment expense reserves, including claim and claim adjustment expense reserves of other insurance operations. Three Months Ended March 31 2021 2020 (In millions) Reserves, beginning of year: Gross $ 22,706 $ 21,720 Ceded 4,005 3,835 Net reserves, beginning of year 18,701 17,885 Reduction of net reserves due to the excess workers’ compensation loss portfolio transfer (632 ) Net incurred claim and claim adjustment expenses: Provision for insured events of current year 1,474 1,355 Increase (decrease) in provision for insured events of prior years (54 ) (8 ) Amortization of discount 50 51 Total net incurred (a) 1,470 1,398 Net payments attributable to: Current year events (85 ) (72 ) Prior year events (1,067 ) (1,218 ) Total net payments (1,152 ) (1,290 ) Foreign currency translation adjustment and other (32 ) (88 ) Net reserves, end of period 18,355 17,905 Ceded reserves, end of period 4,701 3,967 Gross reserves, end of period $ 23,056 $ 21,872 (a) Total net incurred above does not agree to Insurance claims and policyholders’ benefits as reflected on the Consolidated Condensed Statements of Operations due to amounts related to retroactive reinsurance deferred gain accounting, the loss on the excess workers’ compensation loss portfolio transfer, uncollectible reinsurance and benefit expenses related to future policy benefits, which are not reflected in the table above .
Net Prior Year Loss Reserve Development in Property and Casualty Operations	The following table and discussion present details of the net prior year claim and claim adjustment expense reserve development in Property & Casualty Operations: Three Months Ended March 31 2021 2020 (In millions) Medical professional liability $ 8 $ 10 Other professional liability and management liability 3 Surety (15 ) (30 ) Commercial auto 9 Workers’ compensation (13 ) Property and other (8 ) 6 Total pretax (favorable) unfavorable development $ (15 ) $ (15 )

Shareholders' Equity (Tables)

Shareholders' Equity (Tables)	3 Months Ended
	Mar. 31, 2021
Shareholders' Equity [Abstract]
Components of Accumulated Other Comprehensive Income (Loss)	The tables below present the changes in AOCI by component for the three months ended March 31, 2020 and 2021: Net Unrealized Gains (Losses) on Investments with an Allowance for Credit Losses Net Unrealized Gains (Losses) on Other Investments Unrealized Gains (Losses) on Cash Flow Hedges Pension and Postretirement Benefits Foreign Currency Translation Total Accumulated Other Comprehensive Income (Loss) (In millions) Balance, January 1, 2020 $ - $ 918 $ (6 ) $ (855 ) $ (125 ) $ (68 ) Other comprehensive income (loss) before reclassifications, after tax of $ 13 287 6 0 0 (48 ) (1,066 ) (19 ) 1 (84 ) (1,216 ) Reclassification of losses from accumulated other comprehensive income, after tax of $( 10 6 0 3 0 37 22 13 72 Other comprehensive income (loss) (11 ) (1,044 ) (19 ) 14 (84 ) (1,144 ) Amounts attributable to noncontrolling interests 1 111 (1 ) 8 119 Balance, March 31, 2020 $ (10 ) $ (15 ) $ (25 ) $ (842 ) $ (201 ) $ (1,093 ) Balance, January 1, 2021 $ - $ 1,563 $ (23 ) $ (877 ) $ (82 ) $ 581 Other comprehensive income (loss) before reclassifications, after tax of $ 1 154 2 0 0 (3 ) (593 ) 3 3 (590 ) Reclassification of (gains) losses from accumulated other comprehensive income, after tax of $ 1 , $ 8 , $ 1 , $ 2 and $ 0 3 (34 ) 1 9 (21 ) Other comprehensive income (loss) - (627 ) 4 9 3 (611 ) Amounts attributable to noncontrolling interests 66 (1 ) (1 ) 64 Balance, March 31, 2021 $ - $ 1,002 $ (19 ) $ (869 ) $ (80 ) $ 34 Amounts reclassified from AOCI shown above are reported in Net income (loss) as follows: Major Category of AOCI Affected Line Item Net unrealized gains (losses) on investments with an allowance for credit losses, Net unrealized gains (losses) on investments with OTTI losses, and Net unrealized gains (losses) on other investments Investment gains (losses) Unrealized gains (losses) on cash flow hedges Operating revenues and other, Interest expense and Operating expenses and other Pension and postretirement benefits Operating expenses and other

Revenue from Contracts with C_2

Revenue from Contracts with Customers (Tables)	3 Months Ended
	Mar. 31, 2021
Revenue from Contracts with Customers [Abstract]
Revenues from Contracts with Customers Disaggregated of Revenue	Disaggregation of revenues – Three Months Ended March 31 2021 2020 (In millions) Non-insurance warranty - CNA Financial $ 338 $ 301 Transportation and storage of natural gas and NGLs and other services - Boardwalk Pipelines 361 332 Lodging and related services - Loews Hotels & Co 56 142 Rigid plastic packaging and recycled resin – Corporate 280 256 Contract drilling – Diamond Offshore 229 Total revenues from contracts with customers 697 959 Other revenues 18 23 Operating revenues and other $ 715 $ 982

Benefit Plans (Tables)

Benefit Plans (Tables)	3 Months Ended
	Mar. 31, 2021
Benefit Plans [Abstract]
Components of Net Periodic Benefit	The following table presents the components of net periodic benefit for these plans: Pension Benefits Other Postretirement Benefits Three Months Ended March 31 2021 2020 2021 2020 (In millions) Service cost $ 1 $ 1 Interest cost 18 23 Expected return on plan assets (43 ) (43 ) $ (1 ) $ (1 ) Amortization of unrecognized net loss 12 11 Settlement charge 4 Net periodic benefit $ (12 ) $ (4 ) $ (1 ) $ (1 )

Segments (Tables)

Segments (Tables)	3 Months Ended
	Mar. 31, 2021
Segments [Abstract]
Total Assets and Statements of Operations by Segment	Statements of Operations by segment are presented in the following tables. Three Months Ended March 31, 2021 CNA Financial Boardwalk Pipelines Loews Hotels & Co Corporate Total (In millions) Revenues: Insurance premiums $ 1,962 $ 1,962 Net investment income 504 $ 46 550 Investment gains 57 57 Non-insurance warranty revenue 338 338 Operating revenues and other 5 $ 372 $ 57 281 715 Total 2,866 372 57 327 3,622 Expenses: Insurance claims and policyholders’ benefits 1,506 1,506 Amortization of deferred acquisition costs 359 359 Non-insurance warranty expense 311 311 Operating expenses and other 285 217 104 308 914 Interest 28 41 8 48 125 Total 2,489 258 112 356 3,215 Income (loss) before income tax 377 114 (55 ) (29 ) 407 Income tax (expense) benefit (66 ) (29 ) 12 (31 ) (114 ) Net income (loss) 311 85 (43 ) (60 ) 293 Amounts attributable to noncontrolling interests (32 ) (32 ) Net income (loss) attributable to Loews Corporation $ 279 $ 85 $ (43 ) $ (60 ) $ 261 Three Months Ended March 31, 2020 CNA Financial Boardwalk Pipelines Loews Hotels & Co Corporate Diamond Offshore Total (In millions) Revenues: Insurance premiums $ 1,869 $ 1,869 Net investment income (loss) 329 $ (166 ) 163 Investment losses (216 ) (216 ) Non-insurance warranty revenue 301 301 Operating revenues and other 8 $ 341 $ 142 257 $ 234 982 Total 2,291 341 142 91 234 3,099 Expenses: Insurance claims and policyholders’ benefits 1,425 1,425 Amortization of deferred acquisition costs 344 344 Non-insurance warranty expense 281 281 Operating expenses and other 300 211 167 268 1,080 2,026 Interest 31 42 8 31 32 144 Total 2,381 253 175 299 1,112 4,220 Income (loss) before income tax (90 ) 88 (33 ) (208 ) (878 ) (1,121 ) Income tax (expense) benefit 28 (23 ) 8 43 21 77 Net income (loss) (62 ) 65 (25 ) (165 ) (857 ) (1,044 ) Amounts attributable to noncontrolling interests 7 405 412 Net income (loss) attributable to Loews Corporation $ (55 ) $ 65 $ (25 ) $ (165 ) $ (452 ) $ (632 )

Basis of Presentation (Details)

Basis of Presentation (Details) - USD ($) $ in Millions	Apr. 01, 2021	Mar. 31, 2021	Mar. 31, 2020
Stock-based Compensation Awards [Member]
Basis of Presentation [Abstract]
Antidilutive securities excluded from diluted EPS calculation (in shares)		0
Diamond Offshore [Member]
Basis of Presentation [Abstract]
Asset impairment charge			$ 774
Asset impairment charge, after tax and noncontrolling interests			$ 408
CNA [Member]
Basis of Presentation [Abstract]
Subsidiary ownership percentage		89.50%
Altium Packaging LLC [Member]
Basis of Presentation [Abstract]
Subsidiary ownership percentage		99.00%
Subsequent Event [Member] | Altium Packaging LLC [Member]
Basis of Presentation [Abstract]
Percentage interest of subsidiary sold	47.00%

Significant Transaction (Detail

Significant Transaction (Details) - USD ($) $ in Millions	Apr. 01, 2021	Jun. 30, 2021	Mar. 31, 2021	Mar. 12, 2021
Significant Transaction [Abstract]
Assets held for sale			$ 1,786
Liabilities held for sale			1,456
Altium Packaging LLC [Member] | Sale of Interest [Member]
Significant Transaction [Abstract]
Percentage interest of subsidiary being sold				47.00%
Deferred tax liability			35
Assets held for sale			1,800
Property, plant and equipment			500
Goodwill			400
Intangible assets			500
Other assets			400
Liabilities held for sale			1,500
Long term debt			1,100
Other liabilities			$ 400
Altium Packaging LLC [Member] | Sale of Interest [Member] | Forecast [Member]
Significant Transaction [Abstract]
Pretax gain from sale of interest in subsidiary		$ 560
Subsidiary ownership percentage		53.00%
Investment at fair value		$ 475
Subsequent Event [Member] | Altium Packaging LLC [Member] | Sale of Interest [Member]
Significant Transaction [Abstract]
Cash proceeds from sale of interest in subsidiary	$ 420

Investments, Net Investment Inc

Investments, Net Investment Income (Details) - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2021	Mar. 31, 2020
Net Investment Income [Abstract]
Investment income		$ 570	$ 184
Investment expenses		(20)	(21)
Net investment income		550	163
Net unrealized gains (losses) on securities		32	(117)
Fixed Maturity Securities [Member]
Net Investment Income [Abstract]
Investment income		428	438
Limited Partnership Investments [Member]
Net Investment Income [Abstract]
Investment income		47	(102)
Short Term Investments [Member]
Net Investment Income [Abstract]
Investment income			7
Equity Securities [Member]
Net Investment Income [Abstract]
Investment income		29	(44)
Income (Loss) from Trading Portfolio [Member]
Net Investment Income [Abstract]
Investment income	[1]	50	(129)
Other [Member]
Net Investment Income [Abstract]
Investment income		$ 16	$ 14
[1]	Net unrealized gains (losses) related to changes in fair value on securities still held were $32 and $(117) for the three months ended March 31, 2021 and 2020.

Investments, Investment Gains (

Investments, Investment Gains (Losses) (Details) - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2021	Mar. 31, 2020
Investment Gains (Losses) [Abstract]
Investment gains (losses)	[1]	$ 57	$ (216)
Gross investment gains on available-for-sale securities		58	29
Gross investment losses on available-for-sale securities		20	104
Fixed Maturity Securities [Member]
Investment Gains (Losses) [Abstract]
Investment gains (losses)		38	(75)
Equity Securities [Member]
Investment Gains (Losses) [Abstract]
Investment gains (losses)		2	(133)
Derivative Instruments [Member]
Investment Gains (Losses) [Abstract]
Investment gains (losses)		17	5
Short Term Investments and Other [Member]
Investment Gains (Losses) [Abstract]
Investment gains (losses)			(13)
Nonredeemable Preferred Stock [Member]
Investment Gains (Losses) [Abstract]
Recognized gains (losses) on securities		$ 2	$ (133)
[1]	Gross investment gains on available-for-sale securities were $58 and $29 for the three months ended March 31, 2021 and 2020. Gross investment losses on available-for-sale securities were $20 and $104 for the three months ended March 31, 2021 and 2020. During the three months ended March 31, 2021 and 2020, $2 of investment gains and $133 of investment losses were recognized due to the change in fair value of non-redeemable preferred stock still held as of March 31, 2021 and 2020.

Investments, Allowance for Cred

Investments, Allowance for Credit Losses (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
Investments [Abstract]
Accrued interest receivables on available-for-sale fixed maturity securities	$ 389	$ 390	$ 371
Allowance for Credit Losses [Roll Forward]
Beginning balance	40	0
Additions to allowance for securities for which credit losses were not previously recorded	14	48
Additions to allowance for available-for-sale securities accounted for as PCD assets	2	1
Reductions for securities sold during the period (realized)	6	5
Reductions for intent to sell or more likely than not will be required to sell the security before recovery of its amortized cost basis		1
Additional decreases to the allowance for credit losses on securities that had an allowance recorded in a previous period	(7)
Total allowance for credit losses	43	49
Cumulative Effect, Period of Adoption, Adjustment [Member] | ASC 326 [Member]
Allowance for Credit Losses [Roll Forward]
Beginning balance		6
Corporate and Other Bonds [Member]
Allowance for Credit Losses [Roll Forward]
Beginning balance	23	0
Additions to allowance for securities for which credit losses were not previously recorded	14	48
Additions to allowance for available-for-sale securities accounted for as PCD assets	2	1
Reductions for securities sold during the period (realized)	6	5
Reductions for intent to sell or more likely than not will be required to sell the security before recovery of its amortized cost basis		1
Additional decreases to the allowance for credit losses on securities that had an allowance recorded in a previous period	(6)
Total allowance for credit losses	27	49
Corporate and Other Bonds [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member] | ASC 326 [Member]
Allowance for Credit Losses [Roll Forward]
Beginning balance		6
Asset-Backed [Member]
Allowance for Credit Losses [Roll Forward]
Beginning balance	17	0
Additional decreases to the allowance for credit losses on securities that had an allowance recorded in a previous period	(1)
Total allowance for credit losses	$ 16	$ 0

Investments, Available-for-sale

Investments, Available-for-sale Impairment Losses Recognized in Earnings (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Available-For-Sale Impairment Losses [Abstract]
Losses on mortgage loans due to changes in expected credit losses	$ 0	$ 13
Fixed Maturity Securities Available-for-sale [Member]
Available-For-Sale Impairment Losses [Abstract]
Impairment losses recognized in earnings	6	92
Fixed Maturity Securities Available-for-sale [Member] | Corporate and Other Bonds [Member]
Available-For-Sale Impairment Losses [Abstract]
Impairment losses recognized in earnings	7	91
Fixed Maturity Securities Available-for-sale [Member] | Asset-Backed [Member]
Available-For-Sale Impairment Losses [Abstract]
Impairment losses recognized in earnings	$ (1)	$ 1

Investments, Amortized Cost and

Investments, Amortized Cost and Fair Values of Fixed Maturity Securities (Details) - USD ($) $ in Millions	Mar. 31, 2021	Dec. 31, 2020	Mar. 31, 2020	Dec. 31, 2019
Amortized Cost and Fair Values of Fixed Maturity Securities [Abstract]
Cost or amortized cost	$ 39,293	$ 38,963
Gross unrealized gains	4,516	5,800
Gross unrealized losses	182	77
Allowance for credit loss	43	40	$ 49	$ 0
Estimated fair value	43,584	44,646
Shadow adjustments	2,100	2,500
Fixed Maturities Available-for-Sale [Member]
Amortized Cost and Fair Values of Fixed Maturity Securities [Abstract]
Cost or amortized cost	39,257	38,926
Gross unrealized gains	4,513	5,795
Gross unrealized losses	182	77
Allowance for credit loss	43	40
Estimated fair value	43,545	44,604
Corporate and Other Bonds [Member]
Amortized Cost and Fair Values of Fixed Maturity Securities [Abstract]
Cost or amortized cost	21,110	20,792
Gross unrealized gains	2,644	3,578
Gross unrealized losses	71	22
Allowance for credit loss	27	23	49	0
Estimated fair value	23,656	24,325
States, Municipalities and Political Subdivisions [Member]
Amortized Cost and Fair Values of Fixed Maturity Securities [Abstract]
Cost or amortized cost	10,041	9,729
Gross unrealized gains	1,590	1,863
Gross unrealized losses	31
Estimated fair value	11,600	11,592
Asset-Backed [Member]
Amortized Cost and Fair Values of Fixed Maturity Securities [Abstract]
Cost or amortized cost	7,448	7,554
Gross unrealized gains	255	320
Gross unrealized losses	71	52
Allowance for credit loss	16	17	$ 0	$ 0
Estimated fair value	7,616	7,805
Residential Mortgage-Backed [Member]
Amortized Cost and Fair Values of Fixed Maturity Securities [Abstract]
Cost or amortized cost	3,215	3,442
Gross unrealized gains	108	146
Gross unrealized losses	40	1
Estimated fair value	3,283	3,587
Commercial Mortgage-Backed [Member]
Amortized Cost and Fair Values of Fixed Maturity Securities [Abstract]
Cost or amortized cost	1,952	1,933
Gross unrealized gains	76	93
Gross unrealized losses	24	42
Allowance for credit loss	16	17
Estimated fair value	1,988	1,967
Other Asset-Backed [Member]
Amortized Cost and Fair Values of Fixed Maturity Securities [Abstract]
Cost or amortized cost	2,281	2,179
Gross unrealized gains	71	81
Gross unrealized losses	7	9
Estimated fair value	2,345	2,251
U.S. Treasury and Obligations of Government-sponsored Enterprises [Member]
Amortized Cost and Fair Values of Fixed Maturity Securities [Abstract]
Cost or amortized cost	138	339
Gross unrealized gains	1	2
Gross unrealized losses	7	3
Estimated fair value	132	338
Foreign Government [Member]
Amortized Cost and Fair Values of Fixed Maturity Securities [Abstract]
Cost or amortized cost	508	512
Gross unrealized gains	23	32
Gross unrealized losses	2
Estimated fair value	529	544
Redeemable Preferred Stock [Member]
Amortized Cost and Fair Values of Fixed Maturity Securities [Abstract]
Cost or amortized cost	12
Estimated fair value	12
Fixed Maturities Trading [Member]
Amortized Cost and Fair Values of Fixed Maturity Securities [Abstract]
Cost or amortized cost	36	37
Gross unrealized gains	3	5
Estimated fair value	$ 39	$ 42

Investments, Available-for-Sa_2

Investments, Available-for-Sale Securities in Gross Unrealized Loss Position (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Dec. 31, 2020
Gross Unrealized Losses [Abstract]
Additional impairment losses	$ 0
Fixed Maturity Securities [Member]
Estimated Fair Value [Abstract]
Less than 12 months	5,085	$ 1,666
12 months or longer	476	64
Total	5,561	1,730
Gross Unrealized Losses [Abstract]
Less than 12 months	158	74
12 months or longer	24	3
Total	182	77
Corporate and Other Bonds [Member]
Estimated Fair Value [Abstract]
Less than 12 months	1,868	609
12 months or longer	82	12
Total	1,950	621
Gross Unrealized Losses [Abstract]
Less than 12 months	66	21
12 months or longer	5	1
Total	71	22
States, Municipalities and Political Subdivisions [Member]
Estimated Fair Value [Abstract]
Less than 12 months	866	33
Total	866	33
Gross Unrealized Losses [Abstract]
Less than 12 months	31
Total	31
Total Asset-Backed [Member]
Estimated Fair Value [Abstract]
Less than 12 months	2,241	948
12 months or longer	394	52
Total	2,635	1,000
Gross Unrealized Losses [Abstract]
Less than 12 months	52	50
12 months or longer	19	2
Total	71	52
Residential Mortgage-Backed [Member]
Estimated Fair Value [Abstract]
Less than 12 months	1,584	71
12 months or longer	12	11
Total	1,596	82
Gross Unrealized Losses [Abstract]
Less than 12 months	40	1
Total	40	1
Commercial Mortgage-Backed [Member]
Estimated Fair Value [Abstract]
Less than 12 months	320	533
12 months or longer	285	28
Total	605	561
Gross Unrealized Losses [Abstract]
Less than 12 months	9	40
12 months or longer	15	2
Total	24	42
Other Asset-Backed [Member]
Estimated Fair Value [Abstract]
Less than 12 months	337	344
12 months or longer	97	13
Total	434	357
Gross Unrealized Losses [Abstract]
Less than 12 months	3	9
12 months or longer	4
Total	7	9
U.S. Treasury and Obligations of Government-sponsored Enterprises [Member]
Estimated Fair Value [Abstract]
Less than 12 months	65	63
Total	65	63
Gross Unrealized Losses [Abstract]
Less than 12 months	7	3
Total	7	3
Foreign Government [Member]
Estimated Fair Value [Abstract]
Less than 12 months	45	13
Total	45	$ 13
Gross Unrealized Losses [Abstract]
Less than 12 months	2
Total	$ 2

Investments, Available-for-Sa_3

Investments, Available-for-Sale Fixed Maturity Securities by Contractual Maturity (Details) - USD ($) $ in Millions	Mar. 31, 2021	Dec. 31, 2020
Cost or Amortized Cost [Abstract]
Cost or amortized cost	$ 39,293	$ 38,963
Estimated Fair Value [Abstract]
Estimated fair value	43,584	44,646
Available-for-Sale Fixed Maturities [Member]
Cost or Amortized Cost [Abstract]
Due in one year or less	1,468	1,456
Due after one year through five years	10,837	12,304
Due after five years through ten years	13,640	12,319
Due after ten years	13,312	12,847
Cost or amortized cost	39,257	38,926
Estimated Fair Value [Abstract]
Due in one year or less	1,473	1,458
Due after one year through five years	11,583	13,098
Due after five years through ten years	14,685	13,878
Due after ten years	15,804	16,170
Estimated fair value	$ 43,545	$ 44,604

Investments, Amortized Cost Bas

Investments, Amortized Cost Basis of Mortgage Loans for Each Credit Quality Indicator by Year of Origination (Details) - Mortgage Loans [Member] $ in Millions	Mar. 31, 2021USD ($)	[1]
Mortgage Loans Amortized Cost Basis by Origination Year [Abstract]
2021	$ 15
2020	161
2019	284
2018	103
2017	178
Prior	328
Total	1,069
DSCR Greater than or Equal to 1.6x, LTV Less than 55% [Member]
Mortgage Loans Amortized Cost Basis by Origination Year [Abstract]
2020	75
2019	32
2018	36
2017	114
Prior	187
Total	444
DSCR Greater than or Equal to 1.6x, LTV 55% to 65% [Member]
Mortgage Loans Amortized Cost Basis by Origination Year [Abstract]
2020	14
2019	20
2018	14
2017	15
Prior	11
Total	74
DSCR Greater than or Equal to 1.6x, LTV Greater than 65% [Member]
Mortgage Loans Amortized Cost Basis by Origination Year [Abstract]
2021	5
2019	5
Prior	24
Total	34
DSCR Between 1.2 to 1.6x, LTV Less than 55% [Member]
Mortgage Loans Amortized Cost Basis by Origination Year [Abstract]
2019	16
2017	5
Prior	77
Total	98
DSCR Between 1.2 to 1.6x, LTV 55% to 65% [Member]
Mortgage Loans Amortized Cost Basis by Origination Year [Abstract]
2020	20
2019	40
2018	53
2017	27
Total	140
DSCR Between 1.2 to 1.6x, LTV Greater than 65% [Member]
Mortgage Loans Amortized Cost Basis by Origination Year [Abstract]
2021	10
2020	52
2019	44
2017	9
Prior	12
Total	127
DSCR Less than or Equal to 1.2x, LTV Less than 55% [Member]
Mortgage Loans Amortized Cost Basis by Origination Year [Abstract]
2019	50
2017	8
Prior	10
Total	68
DSCR Less than or Equal to 1.2x, LTV 55% to 65% [Member]
Mortgage Loans Amortized Cost Basis by Origination Year [Abstract]
2019	48
Total	48
DSCR Less than or Equal to 1.2x, LTV Greater than 65% [Member]
Mortgage Loans Amortized Cost Basis by Origination Year [Abstract]
2019	29
Prior	7
Total	$ 36
[1]	The values in the table above reflect DSCR on a standardized amortization period and LTV ratios based on the most recent appraised values trended forward using changes in a commercial real estate price index.

Investments, Aggregate Contract

Investments, Aggregate Contractual or Notional Amounts and Estimated Fair Values Related to Derivative Financial Instruments (Details) - USD ($) $ in Millions	Mar. 31, 2021	Dec. 31, 2020
With Hedge Designation [Member] | Interest Rate Swaps [Member]
Gross Estimated Fair Values of Derivative Positions [Abstract]
Contractual/notional amount		$ 675
Liability, estimated fair value		(26)
Without Hedge Designation [Member] | Interest Rate Swaps [Member]
Gross Estimated Fair Values of Derivative Positions [Abstract]
Contractual/notional amount	$ 100	100
Liability, estimated fair value	(2)	(3)
Without Hedge Designation [Member] | Options [Member] | Purchased [Member]
Gross Estimated Fair Values of Derivative Positions [Abstract]
Contractual/notional amount	200	135
Asset, estimated fair value	2	3
Without Hedge Designation [Member] | Embedded Derivative on Funds Withheld Liability [Member]
Gross Estimated Fair Values of Derivative Positions [Abstract]
Contractual/notional amount	256	190
Liability, estimated fair value	$ (2)	$ (19)

Investments, Investment Commitm

Investments, Investment Commitments (Details) - Investments in Assets Requiring Future Purchase, Sale or Funding Commitments [Member] $ in Millions	Mar. 31, 2021USD ($)
Investment Commitments [Abstract]
Commitments to purchase or fund investments	$ 1,400
Commitments to sell investments	$ 100

Fair Value, Assets and Liabilit

Fair Value, Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - Recurring Basis [Member] - USD ($) $ in Millions	Mar. 31, 2021		Dec. 31, 2020
Payable to Brokers [Member]
Assets and Liabilities Measured at Fair Value [Abstract]
Liabilities	$ (73)	[1]	$ (43)
Fixed Maturities Available-for-Sale [Member]
Assets and Liabilities Measured at Fair Value [Abstract]
Assets	43,545		44,604
Corporate Bonds and Other [Member]
Assets and Liabilities Measured at Fair Value [Abstract]
Assets	24,329		25,207
States, Municipalities and Political Subdivisions [Member]
Assets and Liabilities Measured at Fair Value [Abstract]
Assets	11,600		11,592
Asset-Backed [Member]
Assets and Liabilities Measured at Fair Value [Abstract]
Assets	7,616		7,805
Fixed Maturities Trading [Member]
Assets and Liabilities Measured at Fair Value [Abstract]
Assets	39		42
Total Fixed Maturities [Member]
Assets and Liabilities Measured at Fair Value [Abstract]
Assets	43,584		44,646
Equity Securities [Member]
Assets and Liabilities Measured at Fair Value [Abstract]
Assets	1,580		1,561
Short Term and Other [Member]
Assets and Liabilities Measured at Fair Value [Abstract]
Assets	4,176	[1]	4,577
Level 1 [Member] | Payable to Brokers [Member]
Assets and Liabilities Measured at Fair Value [Abstract]
Liabilities	(71)	[1]	(14)
Level 1 [Member] | Fixed Maturities Available-for-Sale [Member]
Assets and Liabilities Measured at Fair Value [Abstract]
Assets	152		355
Level 1 [Member] | Corporate Bonds and Other [Member]
Assets and Liabilities Measured at Fair Value [Abstract]
Assets	152		355
Level 1 [Member] | Total Fixed Maturities [Member]
Assets and Liabilities Measured at Fair Value [Abstract]
Assets	152		355
Level 1 [Member] | Equity Securities [Member]
Assets and Liabilities Measured at Fair Value [Abstract]
Assets	824		796
Level 1 [Member] | Short Term and Other [Member]
Assets and Liabilities Measured at Fair Value [Abstract]
Assets	4,140	[1]	4,538
Level 2 [Member] | Payable to Brokers [Member]
Assets and Liabilities Measured at Fair Value [Abstract]
Liabilities	(2)	[1]	(29)
Level 2 [Member] | Fixed Maturities Available-for-Sale [Member]
Assets and Liabilities Measured at Fair Value [Abstract]
Assets	42,267		43,125
Level 2 [Member] | Corporate Bonds and Other [Member]
Assets and Liabilities Measured at Fair Value [Abstract]
Assets	23,410		24,082
Level 2 [Member] | States, Municipalities and Political Subdivisions [Member]
Assets and Liabilities Measured at Fair Value [Abstract]
Assets	11,556		11,546
Level 2 [Member] | Asset-Backed [Member]
Assets and Liabilities Measured at Fair Value [Abstract]
Assets	7,301		7,497
Level 2 [Member] | Fixed Maturities Trading [Member]
Assets and Liabilities Measured at Fair Value [Abstract]
Assets	34		34
Level 2 [Member] | Total Fixed Maturities [Member]
Assets and Liabilities Measured at Fair Value [Abstract]
Assets	42,301		43,159
Level 2 [Member] | Equity Securities [Member]
Assets and Liabilities Measured at Fair Value [Abstract]
Assets	711		722
Level 2 [Member] | Short Term and Other [Member]
Assets and Liabilities Measured at Fair Value [Abstract]
Assets	36	[1]	39
Level 3 [Member] | Fixed Maturities Available-for-Sale [Member]
Assets and Liabilities Measured at Fair Value [Abstract]
Assets	1,126		1,124
Level 3 [Member] | Corporate Bonds and Other [Member]
Assets and Liabilities Measured at Fair Value [Abstract]
Assets	767		770
Level 3 [Member] | States, Municipalities and Political Subdivisions [Member]
Assets and Liabilities Measured at Fair Value [Abstract]
Assets	44		46
Level 3 [Member] | Asset-Backed [Member]
Assets and Liabilities Measured at Fair Value [Abstract]
Assets	315		308
Level 3 [Member] | Fixed Maturities Trading [Member]
Assets and Liabilities Measured at Fair Value [Abstract]
Assets	5		8
Level 3 [Member] | Total Fixed Maturities [Member]
Assets and Liabilities Measured at Fair Value [Abstract]
Assets	1,131		1,132
Level 3 [Member] | Equity Securities [Member]
Assets and Liabilities Measured at Fair Value [Abstract]
Assets	$ 45		$ 43
[1]	As of March 31, 2021, Short term and other and Payable to brokers exclude amounts classified as held for sale. See Note 2 for further discussion.

Fair Value, Reconciliations of

Fair Value, Reconciliations of Assets and Liabilities Measured at Fair Value on Recurring Basis Using Significant Unobservable Inputs (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Fixed Maturities Available-for-Sale [Member]
Reconciliations for All Assets and Liabilities [Roll Forward]
Beginning balance	$ 1,124	$ 633
Net realized investment gains (losses) and net change in unrealized investment gains (losses), included in net income	(11)	0
Net realized investment gains (losses) and net change in unrealized investment gains (losses), included in OCI	(51)	(46)
Purchases	72	112
Sales	0	0
Settlements	(19)	(5)
Transfers into Level 3	19	0
Transfers out of Level 3	(8)	(1)
Ending balance	1,126	693
Unrealized gains (losses) recognized in net income (loss) on level 3 assets and liabilities	0	0
Unrealized gains (losses) recognized in other comprehensive income (loss) on level 3 assets and liabilities	(51)	(44)
Corporate Bonds and Other [Member]
Reconciliations for All Assets and Liabilities [Roll Forward]
Beginning balance	770	468
Net realized investment gains (losses) and net change in unrealized investment gains (losses), included in net income	(13)
Net realized investment gains (losses) and net change in unrealized investment gains (losses), included in OCI	(40)	(37)
Purchases	42	67
Settlements	(2)	(2)
Transfers into Level 3	10
Ending balance	767	496
Unrealized gains (losses) recognized in other comprehensive income (loss) on level 3 assets and liabilities	(40)	(35)
States, Municipalities and Political Subdivisions [Member]
Reconciliations for All Assets and Liabilities [Roll Forward]
Beginning balance	46
Net realized investment gains (losses) and net change in unrealized investment gains (losses), included in OCI	(2)
Ending balance	44
Unrealized gains (losses) recognized in other comprehensive income (loss) on level 3 assets and liabilities	(2)
Asset-Backed [Member]
Reconciliations for All Assets and Liabilities [Roll Forward]
Beginning balance	308	165
Net realized investment gains (losses) and net change in unrealized investment gains (losses), included in net income	2
Net realized investment gains (losses) and net change in unrealized investment gains (losses), included in OCI	(9)	(9)
Purchases	30	45
Settlements	(17)	(3)
Transfers into Level 3	9
Transfers out of Level 3	(8)	(1)
Ending balance	315	197
Unrealized gains (losses) recognized in other comprehensive income (loss) on level 3 assets and liabilities	(9)	(9)
Fixed Maturities Trading [Member]
Reconciliations for All Assets and Liabilities [Roll Forward]
Beginning balance	8	4
Net realized investment gains (losses) and net change in unrealized investment gains (losses), included in net income	(3)	(1)
Ending balance	5	3
Unrealized gains (losses) recognized in net income (loss) on level 3 assets and liabilities	(3)	(1)
Total Fixed Maturities [Member]
Reconciliations for All Assets and Liabilities [Roll Forward]
Beginning balance	1,132	637
Net realized investment gains (losses) and net change in unrealized investment gains (losses), included in net income	(14)	(1)
Net realized investment gains (losses) and net change in unrealized investment gains (losses), included in OCI	(51)	(46)
Purchases	72	112
Sales	0	0
Settlements	(19)	(5)
Transfers into Level 3	19	0
Transfers out of Level 3	(8)	(1)
Ending balance	1,131	696
Unrealized gains (losses) recognized in net income (loss) on level 3 assets and liabilities	(3)	(1)
Unrealized gains (losses) recognized in other comprehensive income (loss) on level 3 assets and liabilities	(51)	(44)
Equity Securities [Member]
Reconciliations for All Assets and Liabilities [Roll Forward]
Beginning balance	43	19
Net realized investment gains (losses) and net change in unrealized investment gains (losses), included in net income	2	(3)
Ending balance	45	16
Unrealized gains (losses) recognized in net income (loss) on level 3 assets and liabilities	$ 2	$ 3

Fair Value, Significant Unobser

Fair Value, Significant Unobservable Inputs (Details) $ in Millions	Mar. 31, 2021USD ($)	Dec. 31, 2020USD ($)
Quantitative Information About the Significant Unobservable Inputs [Abstract]
Estimated fair value	$ 43,584	$ 44,646
Level 3 [Member] | Fixed Maturity Securities [Member]
Quantitative Information About the Significant Unobservable Inputs [Abstract]
Estimated fair value	$ 936	$ 966
Level 3 [Member] | Fixed Maturity Securities [Member] | Credit Spread [Member] | Discounted Cash Flow [Member] | Minimum [Member]
Quantitative Information About the Significant Unobservable Inputs [Abstract]
Measurement input	0.01	0.01
Level 3 [Member] | Fixed Maturity Securities [Member] | Credit Spread [Member] | Discounted Cash Flow [Member] | Maximum [Member]
Quantitative Information About the Significant Unobservable Inputs [Abstract]
Measurement input	0.08	0.08
Level 3 [Member] | Fixed Maturity Securities [Member] | Credit Spread [Member] | Discounted Cash Flow [Member] | Weighted Average [Member]
Quantitative Information About the Significant Unobservable Inputs [Abstract]
Measurement input	0.02	0.03

Fair Value, Financial Assets an

Fair Value, Financial Assets and Liabilities Not Measured at Fair Value (Details) - USD ($) $ in Millions	Mar. 31, 2021		Dec. 31, 2020
Carrying Amount [Member]
Assets [Abstract]
Other invested assets, primarily mortgage loans	$ 1,043		$ 1,068
Liabilities [Abstract]
Short term debt	140	[1]	35
Long term debt	8,990	[1]	10,042
Estimated Fair Value [Member]
Assets [Abstract]
Other invested assets, primarily mortgage loans	1,107		1,151
Liabilities [Abstract]
Short term debt	144	[1]	36
Long term debt	9,826	[1]	11,247
Estimated Fair Value [Member] | Level 2 [Member]
Liabilities [Abstract]
Short term debt			19
Long term debt	9,204	[1]	10,482
Estimated Fair Value [Member] | Level 3 [Member]
Assets [Abstract]
Other invested assets, primarily mortgage loans	1,107		1,151
Liabilities [Abstract]
Short term debt	144	[1]	17
Long term debt	$ 622	[1]	$ 765
[1]	As of March 31, 2021, Short and Long term debt exclude amounts classified as held for sale. See Note 2 for further discussion.

Claim and Claim Adjustment Ex_3

Claim and Claim Adjustment Expense Reserves, Reconciliation of Claim and Claim Adjustment Expense Reserves (Details) - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2021	Mar. 31, 2020
Claim and Claim Adjustment Expense Reserves [Abstract]
Catastrophe losses, net of reinsurance		$ 125	$ 75
Liability for Unpaid Claim and Claim Adjustment Expenses [Roll Forward]
Gross reserves, beginning of year		22,706	21,720
Ceded reserves, beginning of year		4,005	3,835
Net reserves, beginning of year		18,701	17,885
Reduction of net reserves due to the excess workers' compensation loss portfolio transfer		(632)
Net incurred claim and claim adjustment expenses [Abstract]
Provision for insured events of current year		1,474	1,355
Increase (decrease) in provision for insured events of prior years		(54)	(8)
Amortization of discount		50	51
Total net incurred	[1]	1,470	1,398
Net payments attributable to [Abstract]
Current year events		(85)	(72)
Prior year events		(1,067)	(1,218)
Total net payments		(1,152)	(1,290)
Foreign currency translation adjustment and other		(32)	(88)
Net reserves, end of period		18,355	17,905
Ceded reserves, end of period		4,701	3,967
Gross reserves, end of period		$ 23,056	21,872
COVID-19 Pandemic [Member]
Claim and Claim Adjustment Expense Reserves [Abstract]
Catastrophe losses, net of reinsurance			13
U.S. Weather Related Events [Member]
Claim and Claim Adjustment Expense Reserves [Abstract]
Catastrophe losses, net of reinsurance			$ 62
[1]	Total net incurred above does not agree to Insurance claims and policyholders’ benefits as reflected on the Consolidated Condensed Statements of Operations due to amounts related to retroactive reinsurance deferred gain accounting, the loss on the excess workers’ compensation loss portfolio transfer, uncollectible reinsurance and benefit expenses related to future policy benefits, which are not reflected in the table above.

Claim and Claim Adjustment Ex_4

Claim and Claim Adjustment Expense Reserves, Net Prior Year Development in Property and Casualty Operations (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Net Prior Year Development [Abstract]
Pretax (favorable) unfavorable development	$ (15)	$ (15)
Medical Professional Liability [Member]
Net Prior Year Development [Abstract]
Pretax (favorable) unfavorable development	8	10
Other Professional Liability and Management Liability [Member]
Net Prior Year Development [Abstract]
Pretax (favorable) unfavorable development		3
Surety [Member]
Net Prior Year Development [Abstract]
Pretax (favorable) unfavorable development	(15)	(30)
Commercial Auto [Member]
Net Prior Year Development [Abstract]
Pretax (favorable) unfavorable development		9
Workers' Compensation [Member]
Net Prior Year Development [Abstract]
Pretax (favorable) unfavorable development		(13)
Property and Other [Member]
Net Prior Year Development [Abstract]
Pretax (favorable) unfavorable development	$ (8)	$ 6

Claim and Claim Adjustment Ex_5

Claim and Claim Adjustment Expense Reserves, Asbestos and Environmental Pollution Reserves (Details) - A&EP Reserves [Member] - USD ($) $ in Millions	3 Months Ended		12 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2010	Dec. 31, 2020
Asbestos and Environmental Pollution Reserves ("A&EP") [Abstract]
Net A&EP claim and allocated claim adjustment expense reserves			$ 1,600
Aggregate limit under A&EP Loss Portfolio Transfer			4,000
Ceded A&EP claim and allocated claim adjustment expense reserves 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 book value of billed third party reinsurance receivables transferred to NICO under A&EP loss portfolio transfer			215
Total consideration			$ 2,200
Retroactive reinsurance benefit recognized	$ 10	$ 14
Cumulative amounts ceded under loss portfolio transfer	3,300			$ 3,300
Unrecognized deferred retroactive reinsurance benefit	388			398
Fair value of collateral trust account	$ 4,600			$ 4,200

Claim and Claim Adjustment Ex_6

Claim and Claim Adjustment Expense Reserves, Reinsurance of Excess Workers' Compensation Policies (Details) - USD ($) $ in Millions	Feb. 05, 2021	Mar. 31, 2021	Mar. 31, 2020	Feb. 05, 2021	Dec. 31, 2019
Reinsurance of Excess Workers' Compensation Policies [Abstract]
Claims paid		$ 1,152	$ 1,290
Cavello [Member]
Reinsurance of Excess Workers' Compensation Policies [Abstract]
Percentage of outstanding reserves maintained as security in collateral trust account		105.00%
CNA Financial [Member] | Loss Portfolio Transfer for Workers' Compensation Liabilities [Member]
Reinsurance of Excess Workers' Compensation Policies [Abstract]
Reinsurance recoverable		$ 310			$ 690
Reinsurance premium paid	$ 697
Claims paid				$ 64
Loss contingency, after tax and noncontrolling interests		$ 11
CNA Financial [Member] | Loss Portfolio Transfer for Workers' Compensation Liabilities [Member] | Maximum [Member]
Reinsurance of Excess Workers' Compensation Policies [Abstract]
Reinsurance recoverable	$ 1,000			$ 1,000

Debt (Details)

Debt (Details) - Altium Packaging [Member] - USD ($) $ in Millions	Feb. 03, 2021	Mar. 31, 2020
Debt [Abstract]
Dividend paid	$ 200
Secured Term Loan [Member]
Debt [Abstract]
Face amount	$ 1,050
Term		7 years
Secured Term Loan [Member] | LIBOR [Member]
Debt [Abstract]
Margin	2.75%
Floor rate	0.50%

Shareholders' Equity, Component

Shareholders' Equity, Components of Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Balance	$ 19,181	$ 21,930
Other comprehensive loss	(611)	(1,144)
Balance	18,537	19,178
Accumulated Other Comprehensive Income (Loss) [Member]
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Balance	581	(68)
Other comprehensive income (loss) before reclassifications, after tax	(590)	(1,216)
Reclassification of losses from accumulated other comprehensive income, after tax	(21)	72
Other comprehensive loss	(611)	(1,144)
Amounts attributable to noncontrolling interests	64	119
Balance	34	(1,093)
Net Unrealized Gains (Losses) on Investments with an Allowance for Credit Losses [Member]
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Balance	0	0
Other comprehensive income (loss) before reclassifications, after tax	(3)	(48)
Reclassification of losses from accumulated other comprehensive income, after tax	3	37
Other comprehensive loss	0	(11)
Amounts attributable to noncontrolling interests		1
Balance	0	(10)
Other Comprehensive Income (Loss), Tax [Abstract]
Other comprehensive income (loss) before reclassifications, tax	1	13
Reclassification of (income) losses from accumulated other comprehensive income, tax	(1)	(10)
Net Unrealized Gains (Losses) on Other Investments [Member]
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Balance	1,563	918
Other comprehensive income (loss) before reclassifications, after tax	(593)	(1,066)
Reclassification of losses from accumulated other comprehensive income, after tax	(34)	22
Other comprehensive loss	(627)	(1,044)
Amounts attributable to noncontrolling interests	66	111
Balance	1,002	(15)
Other Comprehensive Income (Loss), Tax [Abstract]
Other comprehensive income (loss) before reclassifications, tax	154	287
Reclassification of (income) losses from accumulated other comprehensive income, tax	8	(6)
Unrealized Gains (Losses) on Cash Flow Hedges [Member]
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Balance	(23)	(6)
Other comprehensive income (loss) before reclassifications, after tax	3	(19)
Reclassification of losses from accumulated other comprehensive income, after tax	1
Other comprehensive loss	4	(19)
Balance	(19)	(25)
Other Comprehensive Income (Loss), Tax [Abstract]
Other comprehensive income (loss) before reclassifications, tax	(2)	6
Reclassification of (income) losses from accumulated other comprehensive income, tax	(1)	0
Pension and Postretirement Benefits [Member]
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Balance	(877)	(855)
Other comprehensive income (loss) before reclassifications, after tax		1
Reclassification of losses from accumulated other comprehensive income, after tax	9	13
Other comprehensive loss	9	14
Amounts attributable to noncontrolling interests	(1)	(1)
Balance	(869)	(842)
Other Comprehensive Income (Loss), Tax [Abstract]
Other comprehensive income (loss) before reclassifications, tax	0	0
Reclassification of (income) losses from accumulated other comprehensive income, tax	(2)	(3)
Foreign Currency Translation [Member]
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Balance	(82)	(125)
Other comprehensive income (loss) before reclassifications, after tax	3	(84)
Other comprehensive loss	3	(84)
Amounts attributable to noncontrolling interests	(1)	8
Balance	(80)	(201)
Other Comprehensive Income (Loss), Tax [Abstract]
Other comprehensive income (loss) before reclassifications, tax	0	0
Reclassification of (income) losses from accumulated other comprehensive income, tax	$ 0	$ 0

Shareholders' Equity, Treasury

Shareholders' Equity, Treasury Stock (Details) - USD ($) shares in Millions, $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Treasury Stock [Abstract]
Purchases of Loews treasury stock (in shares)	5.6	9.7
Purchase of treasury stock	$ 274	$ 445

Revenue from Contracts with C_3

Revenue from Contracts with Customers (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
Disaggregation of Revenues [Abstract]
Revenues from contracts with customers	$ 697	$ 959
Other revenues	18	23
Operating revenues and other	715	982
Deferred Revenue [Abstract]
Deferred revenue	4,119		$ 4,023
Revenue recognized	316	297
Performance Obligations [Abstract]
Remaining performance obligations	13,300
Receivables [Member]
Receivables from Contracts with Customers [Abstract]
Receivables from contracts with customers	251		246
Other Liabilities [Member]
Deferred Revenue [Abstract]
Deferred revenue	4,200		$ 4,100
CNA Financial [Member] | Non-Insurance Warranty [Member]
Disaggregation of Revenues [Abstract]
Revenues from contracts with customers	338	301
Boardwalk Pipelines [Member] | Transportation and Storage of Natural Gas and NGLs and Other Services [Member]
Disaggregation of Revenues [Abstract]
Revenues from contracts with customers	361	332
Loews Hotels & Co [Member] | Lodging and Related Services [Member]
Disaggregation of Revenues [Abstract]
Revenues from contracts with customers	56	142
Corporate [Member] | Rigid Plastic Packaging and Recycled Resin [Member]
Disaggregation of Revenues [Abstract]
Revenues from contracts with customers	280	256
Diamond Offshore [Member] | Contract Drilling [Member]
Disaggregation of Revenues [Abstract]
Revenues from contracts with customers		$ 229
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-04-01
Performance Obligations [Abstract]
Remaining performance obligations	$ 1,900
Expected timing of satisfaction	9 months
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2022-01-01
Performance Obligations [Abstract]
Remaining performance obligations	$ 2,100
Expected timing of satisfaction	1 year

Benefit Plans (Details)

Benefit Plans (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Pension Benefits [Member]
Components of Net Periodic Benefit [Abstract]
Service cost	$ 1	$ 1
Interest cost	18	23
Expected return on plan assets	(43)	(43)
Amortization of unrecognized net loss	12	11
Settlement charge		4
Net periodic benefit	(12)	(4)
Other Postretirement Benefits [Member]
Components of Net Periodic Benefit [Abstract]
Expected return on plan assets	(1)	(1)
Net periodic benefit	$ (1)	$ (1)

Commitments and Contingencies (

Commitments and Contingencies (Details) $ in Billions	Mar. 31, 2021USD ($)
CNA [Member]
CNA Guarantees [Abstract]
Potential amount of future payments under guarantees	$ 1.6

Segments (Details)

Segments (Details) $ in Millions		3 Months Ended
		Mar. 31, 2021USD ($)SegmentSubsidiaries	Mar. 31, 2020USD ($)
Segments [Abstract]
Number of reportable segments | Segment		4
Number of individual operating subsidiaries | Subsidiaries		3
Revenues [Abstract]
Insurance premiums		$ 1,962	$ 1,869
Net investment income (loss)		550	163
Investment gains (losses)	[1]	57	(216)
Non-insurance warranty revenue		338	301
Operating revenues and other		715	982
Total		3,622	3,099
Expenses [Abstract]
Insurance claims and policyholders' benefits		1,506	1,425
Amortization of deferred acquisition costs		359	344
Non-insurance warranty expense		311	281
Operating expenses and other		914	2,026
Interest		125	144
Total		3,215	4,220
Income (loss) before income tax		407	(1,121)
Income tax (expense) benefit		(114)	77
Net income (loss)		293	(1,044)
Amounts attributable to noncontrolling interests		(32)	412
Net income (loss) attributable to Loews Corporation		261	(632)
Operating Segments [Member]
Revenues [Abstract]
Insurance premiums		1,962	1,869
Net investment income (loss)		550	163
Investment gains (losses)		57	(216)
Non-insurance warranty revenue		338	301
Operating revenues and other		715	982
Total		3,622	3,099
Expenses [Abstract]
Insurance claims and policyholders' benefits		1,506	1,425
Amortization of deferred acquisition costs		359	344
Non-insurance warranty expense		311	281
Operating expenses and other		914	2,026
Interest		125	144
Total		3,215	4,220
Income (loss) before income tax		407	(1,121)
Income tax (expense) benefit		(114)	77
Net income (loss)		293	(1,044)
Amounts attributable to noncontrolling interests		(32)	412
Net income (loss) attributable to Loews Corporation		261	(632)
Operating Segments [Member] | CNA Financial [Member]
Revenues [Abstract]
Insurance premiums		1,962	1,869
Net investment income (loss)		504	329
Investment gains (losses)		57	(216)
Non-insurance warranty revenue		338	301
Operating revenues and other		5	8
Total		2,866	2,291
Expenses [Abstract]
Insurance claims and policyholders' benefits		1,506	1,425
Amortization of deferred acquisition costs		359	344
Non-insurance warranty expense		311	281
Operating expenses and other		285	300
Interest		28	31
Total		2,489	2,381
Income (loss) before income tax		377	(90)
Income tax (expense) benefit		(66)	28
Net income (loss)		311	(62)
Amounts attributable to noncontrolling interests		(32)	7
Net income (loss) attributable to Loews Corporation		279	(55)
Operating Segments [Member] | Boardwalk Pipelines [Member]
Revenues [Abstract]
Operating revenues and other		372	341
Total		372	341
Expenses [Abstract]
Operating expenses and other		217	211
Interest		41	42
Total		258	253
Income (loss) before income tax		114	88
Income tax (expense) benefit		(29)	(23)
Net income (loss)		85	65
Net income (loss) attributable to Loews Corporation		85	65
Operating Segments [Member] | Loews Hotels & Co [Member]
Revenues [Abstract]
Operating revenues and other		57	142
Total		57	142
Expenses [Abstract]
Operating expenses and other		104	167
Interest		8	8
Total		112	175
Income (loss) before income tax		(55)	(33)
Income tax (expense) benefit		12	8
Net income (loss)		(43)	(25)
Net income (loss) attributable to Loews Corporation		(43)	(25)
Operating Segments [Member] | Corporate [Member]
Revenues [Abstract]
Net investment income (loss)		46	(166)
Operating revenues and other		281	257
Total		327	91
Expenses [Abstract]
Operating expenses and other		308	268
Interest		48	31
Total		356	299
Income (loss) before income tax		(29)	(208)
Income tax (expense) benefit		(31)	43
Net income (loss)		(60)	(165)
Net income (loss) attributable to Loews Corporation		$ (60)	(165)
Operating Segments [Member] | Diamond Offshore [Member]
Revenues [Abstract]
Operating revenues and other			234
Total			234
Expenses [Abstract]
Operating expenses and other			1,080
Interest			32
Total			1,112
Income (loss) before income tax			(878)
Income tax (expense) benefit			21
Net income (loss)			(857)
Amounts attributable to noncontrolling interests			405
Net income (loss) attributable to Loews Corporation			$ (452)
[1]	Gross investment gains on available-for-sale securities were $58 and $29 for the three months ended March 31, 2021 and 2020. Gross investment losses on available-for-sale securities were $20 and $104 for the three months ended March 31, 2021 and 2020. During the three months ended March 31, 2021 and 2020, $2 of investment gains and $133 of investment losses were recognized due to the change in fair value of non-redeemable preferred stock still held as of March 31, 2021 and 2020.