OTHER FINANCIAL STATEMENT DETAILS - Property and Equipment, Net (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Revenues from External Customers and Long-Lived Assets [Line Items]
Property, plant and equipment, gross	$ 7,590	$ 7,009
Accumulated depreciation and amortization	(5,681)	(5,202)
Total property and equipment, net	1,909	1,807
Depreciation and amortization expense	822	738	$ 701
Net change in property and equipment included in accounts payable	27	17	$ 42
Long-lived assets	2,568	2,514
U.S.
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-lived assets	2,050	2,096
Other countries
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-lived assets	518	418
Computer equipment and software
Revenues from External Customers and Long-Lived Assets [Line Items]
Property, plant and equipment, gross	3,298	3,239
Internal use software and website development costs
Revenues from External Customers and Long-Lived Assets [Line Items]
Property, plant and equipment, gross	3,301	2,831
Land and buildings
Revenues from External Customers and Long-Lived Assets [Line Items]
Property, plant and equipment, gross	380	340
Leasehold improvements
Revenues from External Customers and Long-Lived Assets [Line Items]
Property, plant and equipment, gross	379	377
Furniture and fixtures
Revenues from External Customers and Long-Lived Assets [Line Items]
Property, plant and equipment, gross	146	139
Development in progress and other
Revenues from External Customers and Long-Lived Assets [Line Items]
Property, plant and equipment, gross	$ 86	$ 83