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Stockholders' Equity (Tables)

9 Months Ended

Sep. 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
Change in noncontrolling interest		—			—				—				—				—				82				82
Net income		—			—				—				—				5,452				5				5,457
Other comprehensive income, net of tax		—			—				—				164				—				—				164
Issuances under employee stock purchase plan		1			—				91				—				—				—				91
Issuances under equity incentive plans		12			—				167				—				—				—				167
Stock-based compensation		—			—				667				—				—				—				667
Repurchases of common stock		(27	)		—				(71		)		—				(1,996		)		—				(2,067		)
Dividends declared		—			—				—				—				(2,245		)		—				(2,245		)
Cumulative effect from the adoption of new accounting standards		—			—				—				(293		)		483				—				190
Balance at September 30, 2018		1,294			$	1			$	2,118			$	36			$	20,706			$	146			$	23,007

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)		(17		)		25				51				59
Reclassifications to net income		—				4				101				105
Net current period other comprehensive income (loss)		(17		)		29				152				164
Balance at September 30, 2018		$	68			$	(70	)		$	38			$	36