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Fair Value Measurements (Tables)
6 Months Ended
Jun. 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 June 30, 2021, were as follows:
Observable InputsDirectly or Indirectly Observable InputsUnobservable Inputs
Total(Level 1) (Level 2) (Level 3)
 (In millions)
Corporate debt securities$1,393 $— $1,393 $— 
Mortgage-backed securities548 — 548 — 
Asset-backed securities176 — 176 — 
Municipal securities75 — 75 — 
U.S. Treasury notes26 — 26 — 
Other
23 — 23 — 
Total assets$2,241 $— $2,241 $— 
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 — 
Asset-backed securities132 — 132 — 
Municipal securities68 — 68 — 
U.S. Treasury notes27 — 27 — 
Total assets $1,875 $— $1,875 $— 
Contingent consideration liabilities $46 $— $— $46 
Total liabilities$46 $— $— $46 
Fair value measurements of senior notes
 June 30, 2021December 31, 2020
 Carrying
Amount
Fair Value Carrying
Amount
Fair Value
 (In millions)
4.375% Notes
$790 $835 $789 $843 
5.375% Notes
698 733 697 742 
3.875% Notes
641 678 641 691 
Total$2,129 $2,246 $2,127 $2,276