Goodwill, Customer Relationships and Other Intangible Assets - Rollforward of Goodwill (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2020 USD ($)
Goodwill [Roll Forward]
As of December 31, 2019	$ 21,534,000
Effect of foreign currency exchange rate change and other	(61,000)
As of March 31, 2020	21,473,000
International and Global Accounts
Goodwill [Roll Forward]
As of December 31, 2019	2,670,000
Effect of foreign currency exchange rate change and other	(61,000)
As of March 31, 2020	2,609,000
Enterprise
Goodwill [Roll Forward]
As of December 31, 2019	4,738,000
Effect of foreign currency exchange rate change and other	0
As of March 31, 2020	4,738,000
Small and Medium Business
Goodwill [Roll Forward]
As of December 31, 2019	3,259,000
Effect of foreign currency exchange rate change and other	0
As of March 31, 2020	3,259,000
Wholesale
Goodwill [Roll Forward]
As of December 31, 2019	3,813,000
Effect of foreign currency exchange rate change and other	0
As of March 31, 2020	3,813,000
Consumer
Goodwill [Roll Forward]
As of December 31, 2019	7,054,000
Effect of foreign currency exchange rate change and other	0
As of March 31, 2020	$ 7,054,000