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Fair Value Measurements (Tables)
6 Months Ended
Jun. 30, 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 June 30, 2025, were as follows:
Observable InputsDirectly or Indirectly Observable InputsUnobservable Inputs
Total(Level 1) (Level 2) (Level 3)
 (In millions)
Corporate debt securities$2,643 $— $2,643 $— 
Mortgage-backed securities980 — 980 — 
Asset-backed securities424 — 424 — 
Municipal securities196 — 196 — 
U.S. Treasury notes20 — 20 — 
Other
47 — 47 — 
Total assets$4,310 $— $4,310 $— 
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
 June 30, 2025December 31, 2024
 Carrying
Amount
Fair Value Carrying
Amount
Fair Value
 (In millions)
4.375% Notes due 2028
$796 $782 $795 $759 
3.875% Notes due 2030
645 603 645 578 
3.875% Notes due 2032
743 683 743 648 
6.250% Notes due 2033
741 763 740 741 
Term Loan450 450 — — 
Total$3,375 $3,281 $2,923 $2,726