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Fair Value Measurements (Tables)
9 Months Ended
Sep. 30, 2021
Fair Value Disclosures [Abstract]  
Fair value of assets measured on recurring basis
Our financial instruments measured at fair value on a recurring basis at September 30, 2021, were as follows:
Observable InputsDirectly or Indirectly Observable InputsUnobservable Inputs
Total(Level 1) (Level 2) (Level 3)
 (In millions)
Corporate debt securities$1,705 $— $1,705 $— 
Mortgage-backed securities610 — 610 — 
U.S. Treasury notes235 — 235 — 
Asset-backed securities224 — 224 — 
Municipal securities97 — 97 — 
Other
29 — 29 — 
Total assets$2,900 $— $2,900 $— 
Contingent consideration liabilities$26 $— $— $26 
Total liabilities$26 $— $— $26 
Our financial instruments measured at fair value on a recurring basis at December 31, 2020, were as follows:
Observable InputsDirectly or Indirectly Observable InputsUnobservable Inputs
Total(Level 1)(Level 2)(Level 3)
 (In millions)
Corporate debt securities$1,256 $— $1,256 $— 
Mortgage-backed securities392 — 392 — 
U.S. Treasury notes27 — 27 — 
Asset-backed securities132 — 132 — 
Municipal securities68 — 68 — 
Total assets $1,875 $— $1,875 $— 
Contingent consideration liabilities $46 $— $— $46 
Total liabilities$46 $— $— $46 
Fair value measurements of senior notes
 September 30, 2021December 31, 2020
 Carrying
Amount
Fair Value Carrying
Amount
Fair Value
 (In millions)
4.375% Notes
$790 $835 $789 $843 
5.375% Notes
698 725 697 742 
3.875% Notes
642 688 641 691 
Total$2,130 $2,248 $2,127 $2,276