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Fair Value (Tables)
3 Months Ended
Mar. 31, 2024
Fair Value Disclosures [Abstract]  
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis Financial assets measured at fair value on a recurring basis on the unaudited condensed consolidated balance sheets at March 31, 2024 and December 31, 2023 were as follows:
In millionsLevel 1Level 2Level 3Total
March 31, 2024    
Cash and cash equivalents$3,548 $6,253 $— $9,801 
Debt securities:    
U.S. government securities2,125 22 — 2,147 
States, municipalities and political subdivisions— 2,008 — 2,008 
U.S. corporate securities— 10,545 26 10,571 
Foreign securities— 2,503 — 2,503 
Residential mortgage-backed securities— 800 — 800 
Commercial mortgage-backed securities— 1,036 — 1,036 
Other asset-backed securities— 3,543 — 3,543 
Redeemable preferred securities— 18 — 18 
Total debt securities2,125 20,475 26 22,626 
Equity securities212 — 88 300 
Total$5,885 $26,728 $114 $32,727 
December 31, 2023    
Cash and cash equivalents$2,174 $6,022 $— $8,196 
Debt securities:    
U.S. government securities2,013 23 — 2,036 
States, municipalities and political subdivisions— 2,215 — 2,215 
U.S. corporate securities— 9,814 29 9,843 
Foreign securities— 2,512 — 2,512 
Residential mortgage-backed securities— 810 — 810 
Commercial mortgage-backed securities— 975 — 975 
Other asset-backed securities— 3,302 — 3,302 
Redeemable preferred securities— 20 — 20 
Total debt securities2,013 19,671 29 21,713 
Equity securities194 — 79 273 
Total$4,381 $25,693 $108 $30,182 
Fair Value, by Balance Sheet Grouping
The carrying value and estimated fair value classified by level of fair value hierarchy for financial instruments carried on the unaudited condensed consolidated balance sheets at adjusted cost or contract value at March 31, 2024 and December 31, 2023 were as follows:
Carrying
Value
 Estimated Fair Value
In millionsLevel 1Level 2Level 3Total
March 31, 2024
Assets: 
Mortgage loans$1,362 $— $— $1,316 $1,316 
Equity securities (1)
559 N/AN/AN/AN/A
Liabilities:
Investment contract liabilities:
With a fixed maturity— — 
Without a fixed maturity321 — — 282 282 
Long-term debt61,425 57,427 — — 57,427 
December 31, 2023
Assets: 
Mortgage loans$1,311 $— $— $1,274 $1,274 
Equity securities (1)
534 N/AN/AN/AN/A
Liabilities:  
Investment contract liabilities:  
With a fixed maturity— — 
Without a fixed maturity312 — — 279 279 
Long-term debt61,410 58,451 — — 58,451 
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(1)It was not practical to estimate the fair value of these cost-method investments as it represents shares of unlisted companies.
Schedule of Fair Value of Separate Accounts by Major Category of Investment Separate Accounts financial assets as of March 31, 2024 and December 31, 2023 were as follows:
 March 31, 2024December 31, 2023
In millionsLevel 1Level 2Level 3TotalLevel 1Level 2Level 3Total
Cash and cash equivalents$$150 $— $151 $$166 $— $168 
Debt securities593 1,910 — 2,503 558 1,949 — 2,507 
Common/collective trusts— 572 — 572 — 529 — 529 
Total (1)
$594 $2,632 $— $3,226 $560 $2,644 $— $3,204 
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(1)Excludes $45 million and $46 million of other receivables at March 31, 2024 and December 31, 2023, respectively.
The following table shows the fair value of assets, by major investment category, supporting Separate Accounts as of March 31, 2024 and December 31, 2023:
In millionsMarch 31,
2024
December 31,
2023
Cash and cash equivalents$151 $168 
Debt securities:
U.S. government securities588 573 
States, municipalities and political subdivisions21 28 
U.S. corporate securities1,645 1,632 
Foreign securities203 202 
Residential mortgage-backed securities32 51 
Commercial mortgage-backed securities
Other asset-backed securities11 15 
Total debt securities2,503 2,507 
Common/collective trusts572 529 
Total (1)
$3,226 $3,204 
_____________________________________________
(1)Excludes $45 million and $46 million of other receivables at March 31, 2024 and December 31, 2023, respectively.