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Fair Value Measurements (Tables)
 3 Months Ended
Mar. 31, 2022
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 March 31, 2022, were as follows:
Observable InputsDirectly or Indirectly Observable InputsUnobservable Inputs
Total(Level 1) (Level 2) (Level 3)
 (In millions)
Corporate debt securities$1,808 $— $1,808 $— 
Mortgage-backed securities598 — 598 — 
Asset-backed securities252 — 252 — 
U.S. Treasury notes174 — 174 — 
Municipal securities117 — 117 — 
Other
39 — 39 — 
Total assets$2,988 $— $2,988 $— 
Contingent consideration liabilities$8 $— $— $8 
Total liabilities$8 $— $— $8 
Our financial instruments measured at fair value on a recurring basis at December 31, 2021, were as follows:
Observable InputsDirectly or Indirectly Observable InputsUnobservable Inputs
Total(Level 1)(Level 2)(Level 3)
 (In millions)
Corporate debt securities$1,833 $— $1,833 $— 
Mortgage-backed securities614 — 614 — 
Asset-backed securities247 — 247 — 
U.S. Treasury notes353 — 353 — 
Municipal securities123 — 123 — 
Other
32 — 32 — 
Total assets $3,202 $— $3,202 $— 
Contingent consideration liabilities $47 $— $— $47 
Total liabilities$47 $— $— $47 
Schedule of Fair Value Measurements of Senior Notes
 March 31, 2022December 31, 2021
 Carrying
Amount		Fair Value Carrying
Amount		Fair Value
 (In millions)
4.375% Notes due 2028
$791 $789 $791 $829 
3.875% Notes due 2030
642 624 642 675 
3.875% Notes due 2032
741 713 740 760 
Total$2,174 $2,126 $2,173 $2,264