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Fair Value Measurements (Tables)
 12 Months Ended
Dec. 31, 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 December 31, 2021, were as follows:
TotalLevel 1Level 2Level 3
 (In millions)
Corporate debt securities$1,833 $— $1,833 $— 
Mortgage-backed securities614 — 614 — 
U.S. Treasury notes353 — 353 — 
Asset-backed securities247 — 247 — 
Municipal securities123 — 123 — 
Other
32 — 32 — 
Total assets$3,202 $— $3,202 $— 
Contingent consideration liabilities$47 $— $— $47 
Total liabilities$47 $— $— $47 
Our financial instruments measured at fair value on a recurring basis at December 31, 2020, were as follows:
TotalLevel 1Level 2Level 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
 December 31, 2021December 31, 2020
 Carrying
Amount		Fair Value Carrying
Amount		Fair Value
 (In millions)
5.375% Notes due 2022 (1)
$— $— $697 $742 
4.375% Notes due 2028
791 829 789 843 
3.875% Notes due 2030
642 675 641 691 
3.875% Notes due 2032
740 760 — — 
Total$2,173 $2,264 $2,127 $2,276 
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(1)     For more information on debt repayments, refer to Note 11, “Debt.”