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Fair Value Measurements (Tables)
6 Months Ended
Jun. 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 June 30, 2024, were as follows:
Observable InputsDirectly or Indirectly Observable InputsUnobservable Inputs
Total(Level 1) (Level 2) (Level 3)
 (In millions)
Corporate debt securities$2,801 $— $2,801 $— 
Mortgage-backed securities924 — 924 — 
Asset-backed securities383 — 383 — 
Municipal securities186 — 186 — 
U.S. Treasury notes— — 
Other
44 — 44 — 
Total assets$4,347 $— $4,347 $— 
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
 June 30, 2024December 31, 2023
 Carrying
Amount
Fair Value Carrying
Amount
Fair Value
 (In millions)
4.375% Notes due 2028
$794 $752 $794 $757 
3.875% Notes due 2030
644 576 644 583 
3.875% Notes due 2032
743 647 742 654 
Total$2,181 $1,975 $2,180 $1,994