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Fair Value Measurements (Tables)
3 Months Ended
Mar. 31, 2025
Fair Value Disclosures [Abstract]  
Schedule of Fair Value of Assets Measured on Recurring Basis
Our financial instruments measured at fair value on a recurring basis at March 31, 2025, were as follows:
Observable InputsDirectly or Indirectly Observable InputsUnobservable Inputs
Total(Level 1) (Level 2) (Level 3)
 (In millions)
Corporate debt securities$2,751 $— $2,751 $— 
Mortgage-backed securities983 — 983 — 
Asset-backed securities441 — 441 — 
Municipal securities210 — 210 — 
U.S. Treasury notes— — 
Other
48 — 48 — 
Total assets$4,438 $— $4,438 $— 
Our financial instruments measured at fair value on a recurring basis at December 31, 2024, were as follows:
Observable InputsDirectly or Indirectly Observable InputsUnobservable Inputs
Total(Level 1)(Level 2)(Level 3)
 (In millions)
Corporate debt securities$2,744 $— $2,744 $— 
Mortgage-backed securities914 — 914 — 
Asset-backed securities431 — 431 — 
Municipal securities183 — 183 — 
U.S. Treasury notes— — 
Other48 — 48 — 
Total assets $4,325 $— $4,325 $— 
Schedule of Fair Value Measurements of Senior Notes
 March 31, 2025December 31, 2024
 Carrying
Amount
Fair Value Carrying
Amount
Fair Value
 (In millions)
4.375% Notes due 2028
$796 $763 $795 $759 
3.875% Notes due 2030
645 581 645 578 
3.875% Notes due 2032
743 658 743 648 
6.250% Notes due 2033
740 740 740 741 
Term Loan500 500 — — 
Credit Facility150 150 — — 
Total$3,574 $3,392 $2,923 $2,726