Condensed Consolidated Statements of Comprehensive Income (unaudited) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Statement of Comprehensive Income [Abstract]
Net income	$ 3,497	$ 4,497	$ 7,064	$ 8,829
Other comprehensive income (loss):
Net foreign currency translation gains (losses), net of tax	9	3	11	(7)
Available-for-sale securities:
Net unrealized gains (losses), net of tax impact of $(12), $(1), $18 and $2, respectively	154	(3)	130	3
Reclassifications to net income, net of tax	(2)	0	(2)	0
Net change	152	(3)	128	3
Cash flow hedges:
Net unrealized gains (losses), net of tax impact of $(1), $(3), $(11) and $3, respectively	(54)	(110)	(204)	273
Reclassifications to net income, net of tax impact of $(1), $(5), $(7), and $(9), respectively	11	(182)	(69)	(323)
Net change	(43)	(292)	(273)	(50)
Other comprehensive income (loss)	118	(292)	(134)	(54)
Comprehensive income	3,615	4,205	6,930	8,775
Comprehensive income attributable to noncontrolling interest	0	5	1	4
Comprehensive income attributable to Gilead	$ 3,615	$ 4,200	$ 6,929	$ 8,771