Fair Value Measurements (Tables)

3 Months Ended

Mar. 31, 2021

Our financial instruments measured at fair value on a recurring basis at March 31, 2021, were as follows:


			Observable Inputs		Directly or Indirectly Observable Inputs		Unobservable Inputs
	Total		(Level 1)		(Level 2)		(Level 3)

	(In millions)
Corporate debt securities	$	1,188	$	—	$	1,188	$	—
Mortgage-backed securities	429		—		429		—
Asset-backed securities	152		—		152		—
U.S. Treasury notes	97		—		97		—
Municipal securities	72		—		72		—



Total assets	$	1,938	$	—	$	1,938	$	—

Contingent consideration liabilities	$	31	$	—	$	—	$	31
Total liabilities	$	31	$	—	$	—	$	31

Our financial instruments measured at fair value on a recurring basis at December 31, 2020, were as follows:


			Observable Inputs		Directly or Indirectly Observable Inputs		Unobservable Inputs
	Total		(Level 1)		(Level 2)		(Level 3)

	(In millions)
Corporate debt securities	$	1,256	$	—	$	1,256	$	—
Mortgage-backed securities	392		—		392		—
Asset-backed securities	132		—		132		—
U.S. Treasury notes	27		—		27		—
Municipal securities	68		—		68		—



Total assets	$	1,875	$	—	$	1,875	$	—

Contingent consideration liabilities	$	46	$	—	$	—	$	46
Total liabilities	$	46	$	—	$	—	$	46