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FAIR VALUE (Tables)
3 Months Ended
Mar. 31, 2025
Fair Value Disclosures [Abstract]  
Schedule of Financial Assets Measured at Fair Value on Recurring Basis
The following table summarizes our fair value measurements at March 31, 2025 and December 31, 2024, respectively, for financial assets measured at fair value on a recurring basis:
 Fair Value Measurements Using
 Fair
Value
Quoted Prices
in Active
Markets
(Level 1)
Other
Observable
Inputs
(Level 2)
Unobservable
Inputs
(Level 3)
 (in millions)
March 31, 2025
Cash equivalents$4,074 $4,074 $— $— 
Debt securities:
U.S. Treasury and other U.S. government
    corporations and agencies:
U.S. Treasury and agency obligations2,999 — 2,999 — 
Mortgage-backed securities3,973 — 3,973 — 
Tax-exempt municipal securities497 — 497 — 
Mortgage-backed securities:
Residential545 — 545 — 
Commercial1,155 — 1,139 16 
Asset-backed securities1,354 — 1,266 88 
Corporate debt securities7,775 — 7,493 282 
Total debt securities18,298 — 17,912 386 
Securities lending invested collateral594 594 — — 
Total invested assets$22,966 $4,668 $17,912 $386 
December 31, 2024
Cash equivalents$2,048 $2,048 $— $— 
Debt securities:
U.S. Treasury and other U.S. government
    corporations and agencies:
U.S. Treasury and agency obligations3,227 — 3,227 — 
Mortgage-backed securities3,995 — 3,995 — 
Tax-exempt municipal securities526 — 526 — 
Mortgage-backed securities:
Residential522 — 522 — 
Commercial1,206 — 1,199 
Asset-backed securities1,403 — 1,330 73 
Corporate debt securities7,756 — 7,514 242 
Total debt securities18,635 — 18,313 322 
Securities lending invested collateral418 418 — — 
Total invested assets$21,101 $2,466 $18,313 $322 
Schedule of Changes in Fair Value of Assets Measured using Significant Unobservable Inputs (Level 3) During the three months ended
March 31, 2025 and 2024, the changes in the fair value of the assets measured using significant unobservable inputs (Level 3) were comprised of the following:    
Private Placements
For the three months ended March 31, 2025For the three months ended March 31, 2024
(in millions)
Beginning balance at January 1$322 $218 
Total gains or losses:
Realized in earnings— — 
Unrealized in other comprehensive income(2)
Purchases63 11 
Maturities(2)— 
Sales— — 
Settlements— (1)
Balance at March 31$386 $226 
Schedule of Notional Amounts of Senior Notes Under Swap Agreements
The following table summarizes the notional amounts at March 31, 2025 and December 31, 2024, respectively, for our senior notes under the swap agreements:
Notional amount at
Senior Notes Under Swap AgreementsMarch 31, 2025December 31, 2024
(in millions)
$1,500 million, 5.375% due April 15, 2031
$700 $700 
$750 million, 5.875% due March 1, 2033
650 650 
$850 million, 5.950% due March 15, 2034
800 800 
$750 million, 5.550% due May 1, 2035
200 — 
$400 million, 4.625% due December 1, 2042
400 400 
$750 million, 4.950% due October 1, 2044
400 400 
$400 million, 4.800% due March 15, 2047
200 200 
$500 million, 3.950% due August 15, 2049
450 450 
$750 million, 5.500% due March 15, 2053
700 700 
$1,000 million, 5.750% due April 15, 2054
700 700 
Total Senior Notes Under Swap Agreements $5,200 $5,000 
Schedule of Assumptions Used For Inputs In Fair Value Measurement The table below presents the assumptions used for each reporting period.
March 31, 2025December 31, 2024
Annualized volatility
17.4% - 18.9%
17.5% - 18.9%
Credit spread
0.9% - 1.6%
0.9% - 1.5%
Revenue exit multiple
1.5x - 2.5x
1.5x - 2.5x
Weighted average cost of capital
11.0% - 14.5%
11.0% - 14.5%
Long term growth rate3.0 %3.0 %