Acquisitions (Narrative) (Details) - USD ($) $ in Millions	1 Months Ended	12 Months Ended
	Jan. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Business Acquisition [Line Items]
Goodwill		$ 21,175	$ 20,624	$ 17,888
Patents and developed technology
Business Acquisition [Line Items]
Acquired intangible assets, weighted-average useful life		4 years 1 month 6 days
Customer relationships
Business Acquisition [Line Items]
Acquired intangible assets, weighted-average useful life		4 years 8 months 12 days
Trade names and other
Business Acquisition [Line Items]
Acquired intangible assets, weighted-average useful life		4 years 7 months 6 days
Series of individually immaterial business acquisitions
Business Acquisition [Line Items]
Total consideration		$ 744
Acquired intangible assets		248
Goodwill		446
Net assets acquired		$ 50
Fitbit | Subsequent Event
Business Acquisition [Line Items]
Total acquisition price	$ 2,100