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Selected Quarterly Financial Information (Unaudited) (Details) - USD ($) $ / shares in Units, $ in Millions		3 Months Ended								12 Months Ended
	Apr. 07, 2020	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Selected Quarterly Financial Information [Line Items]
Total revenues		$ 7,421	$ 6,577	$ 5,143	$ 5,548	$ 5,879	$ 5,604	$ 5,685	$ 5,281	$ 24,689	$ 22,449	$ 22,127
Gross profit on product sales		5,930	5,352	4,003	4,498	4,113	4,481	4,607	4,243
Net income		1,544	353	(3,346)	1,538	2,689	(1,168)	1,875	1,968	89	5,364	5,460
Net income attributable to Gilead		$ 1,551	$ 360	$ (3,339)	$ 1,551	$ 2,696	$ (1,165)	$ 1,880	$ 1,975	$ 123	$ 5,386	$ 5,455
Net income (loss) per share attributable to Gilead common stockholders - basic (usd per share)		$ 1.24	$ 0.29	$ (2.66)	$ 1.23	$ 2.13	$ (0.92)	$ 1.48	$ 1.55	$ 0.10	$ 4.24	$ 4.20
Net income per share attributable to Gilead common stockholders - diluted (usd per share)		1.23	0.29	(2.66)	$ 1.22	$ 2.12	(0.92)	$ 1.47	$ 1.54	$ 0.10	$ 4.22	$ 4.17
Acquired in-process research and development expenses										$ 5,856	$ 4,251	$ 0
Unrealized loss on investment of equity securities										1,700
Income tax expense (benefit)										1,580	(204)	2,339
Unrealized gain on investment of equity securities											1,200
Impairment charge related to IPR&D intangible asset						$ 800				0	800	820
Inventory write-downs											649	572
Favorable EPS Impact
Selected Quarterly Financial Information [Line Items]
Net income (loss) per share attributable to Gilead common stockholders - basic (usd per share)						$ 0.83
Net income per share attributable to Gilead common stockholders - diluted (usd per share)						$ 0.81
Inventory Write-downs for Excess Raw Materials
Selected Quarterly Financial Information [Line Items]
Inventory write-downs						$ 500					547	440
Intangible Asset Transfer
Selected Quarterly Financial Information [Line Items]
Unrealized gain on investment of equity securities						929
Intangible Asset Transfer
Selected Quarterly Financial Information [Line Items]
Income tax expense (benefit)						$ 1,200					(1,200)	$ 588
Immunomedics, Inc.
Selected Quarterly Financial Information [Line Items]
Net income (loss) per share attributable to Gilead common stockholders - basic (usd per share)		0.49
Net income per share attributable to Gilead common stockholders - diluted (usd per share)		$ 0.49
Acquisition-related expenses		$ 615								39
Arcus, Pionyr, Tango and Tizona
Selected Quarterly Financial Information [Line Items]
Net income (loss) per share attributable to Gilead common stockholders - basic (usd per share)			0.82
Net income per share attributable to Gilead common stockholders - diluted (usd per share)			$ 0.82
Acquired in-process research and development expenses			$ 1,000
Galapagos subscription agreement | Galapagos
Selected Quarterly Financial Information [Line Items]
Net income (loss) per share attributable to Gilead common stockholders - basic (usd per share)		$ 0.50	$ 0.78				2.40
Net income per share attributable to Gilead common stockholders - diluted (usd per share)		$ 0.50	$ 0.78				$ 2.40
Acquired in-process research and development expenses							$ 3,920				$ 3,920
Unrealized loss on investment of equity securities		$ 628	$ 983							$ 1,830
Forty Seven, Inc.
Selected Quarterly Financial Information [Line Items]
Net income (loss) per share attributable to Gilead common stockholders - basic (usd per share)				3.58
Net income per share attributable to Gilead common stockholders - diluted (usd per share)				$ 3.58
Acquired in-process research and development expenses	$ 4,500			$ 4,500

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