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Stockholders' Equity (Tables)

6 Months Ended

Jun. 30, 2018

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				Additional Paid-In Capital				Accumulated Other Comprehensive Income (Loss)				Retained Earnings
Balance at December 31, 2017		1,308			$	1			$	1,264			$	165			$	19,012			$	59			$	20,501
Net income		—			—				—				—				3,355				3				3,358
Other comprehensive income, net of tax		—			—				—				130				—				—				130
Issuances under employee stock purchase plan		1			—				48				—				—				—				48
Issuances under equity incentive plans		8			—				109				—				—				—				109
Stock-based compensation		—			—				477				—				—				—				477
Repurchases of common stock		(21	)		—				(54		)		—				(1,526		)		—				(1,580		)
Dividends declared		—			—				—				—				(1,499		)		—				(1,499		)
Cumulative effect from the adoption of new accounting standards		—			—				—				(293		)		483				—				190
Balance at June 30, 2018		1,296			$	1			$	1,844			$	2			$	19,825			$	62			$	21,734

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, 2017		$	85			$	194			$	(114	)		$	165
Reclassifications to retained earnings as a result of the adoption of new accounting standards		—				(293		)		—				(293		)
Balance at January 1, 2018		85				(99		)		(114		)		(128		)
Net unrealized gain (loss)		(18		)		(6		)		57				33
Reclassifications to net income		—				4				93				97
Net current period other comprehensive income (loss)		(18		)		(2		)		150				130
Balance at June 30, 2018		$	67			$	(101	)		$	36			$	2