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Fair Value Measurements (Tables)
12 Months Ended
Dec. 31, 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 December 31, 2024, were as follows:
TotalLevel 1Level 2Level 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— — 
Other
48 — 48 — 
Total assets$4,325 $— $4,325 $— 
Our financial instruments measured at fair value on a recurring basis at December 31, 2023, were as follows:
TotalLevel 1Level 2Level 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
 December 31, 2024December 31, 2023
 Carrying
Amount
Fair Value Carrying
Amount
Fair Value
 (In millions)
4.375% Notes due 2028
$795 $759 $794 $757 
3.875% Notes due 2030
645 578 644 583 
3.875% Notes due 2032
743 648 742 654 
6.250% Notes due 2033
740 741 — — 
Total$2,923 $2,726 $2,180 $1,994