Operating Information by Segment and Geographic Area - External Revenue and Total Assets by Geographic Area (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	$ 4,090,993	$ 4,146,404	$ 8,209,549	$ 8,280,016
North America
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	2,545,700	1,931,100	4,990,800	3,836,800
Asia Pacific (includes Australia)
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	360,000	478,800	686,600	898,700
Europe
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	792,900	957,500	1,464,500	1,968,100
Central and South America
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	258,700	574,200	766,000	1,028,200
Middle East and Africa
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	$ 133,700	$ 204,800	$ 301,600	$ 548,200