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Fair Value (Tables)
 12 Months Ended
Dec. 31, 2023
Fair Value Disclosures [Abstract]  
Assets and liabilities measured at fair value on a recurring basis
Assets and liabilities measured at fair value on a recurring basis are presented in the following tables. Corporate bonds and other includes obligations of the United States of America (U.S.) Treasury, government-sponsored enterprises, foreign governments and redeemable preferred stock.
December 31, 2023   Total
Assets/Liabilities
at Fair Value
(In millions)Level 1Level 2Level 3
Assets    
Fixed maturity securities:    
Corporate bonds and other$161 $23,926 $1,045 $25,132 
States, municipalities and political subdivisions— 7,348 44 7,392 
Asset-backed— 7,000 901 7,901 
Total fixed maturity securities 161 38,274 1,990 40,425 
Equity securities:
Common stock167 — 24 191 
Non-redeemable preferred stock52 440 — 492 
Total equity securities219 440 24 683 
Short term and other1,976 32 — 2,008 
Total assets$2,356 $38,746 $2,014 $43,116 
Liabilities
Other liabilities$— $1 $— $1 
Total liabilities$— $1 $— $1 

December 31, 2022   Total
Assets/Liabilities
at Fair Value
(In millions)Level 1Level 2Level 3
Assets    
Fixed maturity securities:    
Corporate bonds and other$120 $21,187 $810 $22,117 
States, municipalities and political subdivisions— 8,274 43 8,317 
Asset-backed— 6,405 788 7,193 
Total fixed maturity securities 120 35,866 1,641 37,627 
Equity securities:
Common stock150 — 35 185 
Non-redeemable preferred stock54 435 — 489 
Total equity securities204 435 35 674 
Short term and other1,608 71 — 1,679 
Total assets$1,932 $36,372 $1,676 $39,980 
Liabilities  
Other liabilities$— $1 $— $1 
Total liabilities$— $1 $— $1 
Table of reconciliation for assets and liabilities measured at fair value on a recurring basis using significant unobservable inputs
The tables below present a reconciliation for all assets and liabilities measured at fair value on a recurring basis using significant unobservable inputs (Level 3).
Level 3
(In millions)
Corporate bonds and otherStates, municipalities and political subdivisionsAsset-backedEquity securitiesTotal
Balance as of January 1, 2023$810 $43 $788 $35 $1,676 
Total realized and unrealized investment gains (losses):
Reported in Net investment gains (losses)— — (4)— (4)
Reported in Net investment income— — 20 (7)13 
Reported in Other comprehensive income (loss)38 1 9 — 48 
Total realized and unrealized investment gains (losses)38 1 25 (7)57 
Purchases219 — 248 — 467 
Sales— — — (4)(4)
Settlements(33)— (64)— (97)
Transfers into Level 311 — 23 — 34 
Transfers out of Level 3— — (119)— (119)
Balance as of December 31, 2023$1,045 $44 $901 $24 $2,014 
Unrealized gains (losses) on Level 3 assets and liabilities held as of December 31, 2023 recognized in Net income (loss) in the period$— $— $— $(7)$(7)
Unrealized gains (losses) on Level 3 assets and liabilities held as of December 31, 2023 recognized in Other comprehensive income (loss) in the period38 1 9 — 48 

Level 3
(In millions)
Corporate bonds and otherStates, municipalities and political subdivisionsAsset-backedEquity securitiesTotal
Balance as of January 1, 2022$937 $56 $556 $29 $1,578 
Total realized and unrealized investment gains (losses):
Reported in Net investment gains (losses)(2)— 9 (6)1 
Reported in Net investment income1 — 16 (3)14 
Reported in Other comprehensive income (loss)(184)(13)(126)— (323)
Total realized and unrealized investment gains (losses)(185)(13)(101)(9)(308)
Purchases137 — 424 19 580 
Sales(5)— (2)(3)(10)
Settlements(84)— (70)9 (145)
Transfers into Level 310 — 75 — 85 
Transfers out of Level 3— — (94)(10)(104)
Balance as of December 31, 2022$810 $43 $788 $35 $1,676 
Unrealized gains (losses) on Level 3 assets and liabilities held as of December 31, 2022 recognized in Net income (loss) in the period$— $— $— $(4)$(4)
Unrealized gains (losses) on Level 3 assets and liabilities held as of December 31, 2022 recognized in Other comprehensive income (loss) in the period(183)(13)(125)— (321)
Quantitative information about significant unobservable inputs in the fair value measurement of level 3 assets
The following tables present quantitative information about the significant unobservable inputs utilized by the Company in the fair value measurements of Level 3 assets. Valuations for assets and liabilities not presented in the tables below are primarily based on broker/dealer quotes for which there is a lack of transparency as to inputs used to develop the valuations. The quantitative detail of these unobservable inputs is neither provided nor reasonably available to the Company. The weighted average rate is calculated based on fair value.
December 31, 2023Estimated Fair Value
(In millions)		Valuation Technique(s)Unobservable Input(s)Range
 (Weighted Average)
Fixed maturity securities$1,495 Discounted cash flowCredit spread
1% - 7% (2%)
December 31, 2022Estimated Fair Value
(In millions)		Valuation Technique(s)Unobservable Input(s)Range
 (Weighted Average)
Fixed maturity securities$1,177 Discounted cash flowCredit spread
1% - 8% (2%)
Carrying amount and estimated fair value of financial instrument assets and liabilities not measured at fair value
The carrying amount and estimated fair value of the Company's financial assets and liabilities which are not measured at fair value on the Consolidated Balance Sheets are presented in the following tables.
December 31, 2023Carrying
Amount		Estimated Fair Value
(In millions)Level 1Level 2Level 3Total
Assets
Mortgage loans$1,035 $— $— $997 $997 
Liabilities
Short-term debt$550 $— $546 $— $546 
Long-term debt2,481 — 2,385 — 2,385 
December 31, 2022Carrying
Amount		Estimated Fair Value
(In millions)Level 1Level 2Level 3Total
Assets
Mortgage loans$1,040 $— $— $973 $973 
Liabilities
Short-term debt$243 $— $248 $— $248 
Long-term debt2,538 — 2,349 — 2,349