Restructuring and other (Tables)

12 Months Ended

Dec. 31, 2019

Restructuring and Related Activities [Abstract]

Summary of Restructuring and Other Costs

The following table summarizes pre-tax restructuring and other costs for the periods presented:

	Year Ended December 31,
	2019		2018		2017
Employee severance(1)	$	9	$	37	$	10
Acquisition-related costs(2)	—		8		21
Contingent acquisition consideration(3)	2		29		—
Legal and related	—		152		—
Restructuring, integration and other	17		27		15
Total	$	28	$	253	$	46
(1) Including employee severance and termination costs associated with restructuring activities. (2) Years ended December 31, 2018 and 2017, include $8 million and $15 million related to NYX acquisition, respectively. (3) Represents contingent consideration fair value adjustment (see Note 16).