Revenues by Geography, Concentration of Credit Risk and Remaining Performance Obligations (Tables)

9 Months Ended

Sep. 30, 2021

Revenue from Contract with Customer [Abstract]

Summary of Revenues by Geographic Region and Reportable Segment

The following tables represent revenues by geographic region and reportable segment for the three and nine months ended September 30, 2021 and 2020:

	Three Months Ended September 30, 2021
(in millions)		Technology & Analytics Solutions		Research & Development Solutions		Contract Sales & Medical Solutions		Total
Revenues:
Americas		$	647	$	942	$	94	$	1,683
Europe and Africa		529		448		42		1,019
Asia-Pacific		161		463		65		689
Total revenues		$	1,337	$	1,853	$	201	$	3,391

	Three Months Ended September 30, 2020
(in millions)		Technology & Analytics Solutions		Research & Development Solutions		Contract Sales & Medical Solutions		Total
Revenues:
Americas		$	599	$	628	$	76	$	1,303
Europe and Africa		457		411		44		912
Asia-Pacific		151		361		59		571
Total revenues		$	1,207	$	1,400	$	179	$	2,786

	Nine Months Ended September 30, 2021
(in millions)		Technology & Analytics Solutions		Research & Development Solutions		Contract Sales & Medical Solutions		Total
Revenues:
Americas		$	1,882	$	2,911	$	258	$	5,051
Europe and Africa		1,684		1,398		133		3,215
Asia-Pacific		472		1,303		197		1,972
Total revenues		$	4,038	$	5,612	$	588	$	10,238

	Nine Months Ended September 30, 2020
(in millions)		Technology & Analytics Solutions		Research & Development Solutions		Contract Sales & Medical Solutions		Total
Revenues:
Americas		$	1,747	$	1,826	$	247	$	3,820
Europe and Africa		1,254		1,214		134		2,602
Asia-Pacific		432		1,036		171		1,639
Total revenues		$	3,433	$	4,076	$	552	$	8,061