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Fair Value Measurements (Tables)
9 Months Ended
Sep. 30, 2024
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 September 30, 2024, were as follows:
Observable InputsDirectly or Indirectly Observable InputsUnobservable Inputs
Total(Level 1) (Level 2) (Level 3)
 (In millions)
Corporate debt securities$2,848 $— $2,848 $— 
Mortgage-backed securities945 — 945 — 
Asset-backed securities438 — 438 — 
Municipal securities195 — 195 — 
U.S. Treasury notes— — 
Other
51 — 51 — 
Total assets$4,482 $— $4,482 $— 
Our financial instruments measured at fair value on a recurring basis at December 31, 2023, were as follows:
Observable InputsDirectly or Indirectly Observable InputsUnobservable Inputs
Total(Level 1)(Level 2)(Level 3)
 (In millions)
Corporate debt securities$2,732 $— $2,732 $— 
Mortgage-backed securities911 — 911 — 
Asset-backed securities365 — 365 — 
Municipal securities166 — 166 — 
U.S. Treasury notes40 — 40 — 
Other
45 — 45 — 
Total assets $4,259 $— $4,259 $— 
Schedule of Fair Value Measurements of Senior Notes
 September 30, 2024December 31, 2023
 Carrying
Amount
Fair Value Carrying
Amount
Fair Value
 (In millions)
4.375% Notes due 2028
$795 $778 $794 $757 
3.875% Notes due 2030
644 604 644 583 
3.875% Notes due 2032
743 685 742 654 
Credit Facility150 150 — — 
Total$2,332 $2,217 $2,180 $1,994