Business Combinations - Allocation of Purchase Consideration (Details) - USD ($) $ in Millions	1 Months Ended	3 Months Ended
	Jan. 31, 2020	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019
Business Acquisition [Line Items]
Goodwill		$ 9,124		$ 6,212
Total purchase consideration		$ 3,612	$ 0
Honey Science Corporation
Business Acquisition [Line Items]
Goodwill	$ 2,959
Total intangibles	717
Accounts receivable, net	55
Deferred tax liabilities, net	(76)
Other net liabilities	(18)
Total purchase consideration	3,637
Customer lists and user base | Honey Science Corporation
Business Acquisition [Line Items]
Total intangibles	115
Marketing related | Honey Science Corporation
Business Acquisition [Line Items]
Total intangibles	30
Developed technology | Honey Science Corporation
Business Acquisition [Line Items]
Total intangibles	$ 572