Stockholders' Equity (Tables)

9 Months Ended

Sep. 30, 2017

Equity [Abstract]

Summary of Changes in Stockholders Equity

The following table summarizes the changes in stockholders’ equity (in millions):

	Gilead Stockholders’ Equity													Noncontrolling Interest			Total Stockholders’ Equity
	Common Stock				Additional Paid-In Capital			Accumulated Other Comprehensive Income (Loss)			Retained Earnings
	Shares		Amount
Balance at December 31, 2016	1,310		$	1	$	454		$	278		$	18,154		$	476		$	19,363
Net income (loss)	—		—		—			—			8,493			(13		)	8,480
Other comprehensive loss, net of tax	—		—		—			(29		)	—			—			(29		)
Change in noncontrolling interest	—		—		—			—			—			(54		)	(54		)
Issuances under employee stock purchase plan	1		—		83			—			—			—			83
Issuances under equity incentive plans	9		—		95			—			—			—			95
Stock-based compensation	—		—		305			—			—			—			305
Repurchases of common stock	(13	)	—		(31		)	—			(903		)	—			(934		)
Dividends declared	—		—		—			—			(2,055		)	—			(2,055		)
Balance at September 30, 2017	1,307		$	1	$	906		$	249		$	23,689		$	409		$	25,254

Summary of Changes in Accumulated Other Comprehensive Income (Loss)

The following table summarizes the changes in AOCI by component, net of tax (in millions):

	Foreign Currency Translation			Unrealized Gains and Losses on Available-for-Sale Securities			Unrealized Gains and Losses on Cash Flow Hedges			Total
Balance at December 31, 2016	$	132		$	(16	)	$	162		$	278
Other comprehensive income (loss) before reclassifications	(51		)	311			(278		)	(18		)
Amounts reclassified from AOCI	—			(7		)	(4		)	(11		)
Net current period other comprehensive income (loss)	(51		)	304			(282		)	(29		)
Balance at September 30, 2017	$	81		$	288		$	(120	)	$	249