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Fair Value Measurements (Tables)
 6 Months Ended
Jun. 30, 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 June 30, 2022, were as follows:
Observable InputsDirectly or Indirectly Observable InputsUnobservable Inputs
Total(Level 1) (Level 2) (Level 3)
 (In millions)
Corporate debt securities$2,268 $— $2,268 $— 
Mortgage-backed securities717 — 717 — 
Asset-backed securities293 — 293 — 
Municipal securities146 — 146 — 
U.S. Treasury notes96 — 96 — 
Other
47 — 47 — 
Total assets$3,567 $— $3,567 $— 
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 — 
Municipal securities123 — 123 — 
U.S. Treasury notes353 — 353 — 
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
 June 30, 2022December 31, 2021
 Carrying
Amount		Fair Value Carrying
Amount		Fair Value
 (In millions)
4.375% Notes due 2028
$792 $724 $791 $829 
3.875% Notes due 2030
642 550 642 675 
3.875% Notes due 2032
741 630 740 760 
Total$2,175 $1,904 $2,173 $2,264