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Fair Value Measurements (Tables)
 12 Months Ended
Dec. 31, 2023
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, 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 $— 
Our financial instruments measured at fair value on a recurring basis at December 31, 2022, were as follows:
TotalLevel 1Level 2Level 3
 (In millions)
Corporate debt securities$2,184 $— $2,184 $— 
Mortgage-backed securities731 — 731 — 
Asset-backed securities288 — 288 — 
Municipal securities149 — 149 — 
U.S. Treasury notes105 — 105 — 
Other
42 — 42 — 
Total assets$3,499 $— $3,499 $— 
Contingent consideration liabilities$8 $— $— $8 
Total liabilities$8 $— $— $8 
Schedule of Fair Value Measurements of Senior Notes
 December 31, 2023December 31, 2022
 Carrying
Amount		Fair Value Carrying
Amount		Fair Value
 (In millions)
4.375% Notes due 2028
$794 $757 $792 $729 
3.875% Notes due 2030
644 583 643 554 
3.875% Notes due 2032
742 654 741 629 
Total$2,180 $1,994 $2,176 $1,912