Condensed Consolidated Statements of Comprehensive Income (unaudited) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Statement of Comprehensive Income [Abstract]
Net income	$ 4,497	$ 3,650	$ 8,829	$ 5,873
Other comprehensive income (loss):
Net foreign currency translation gains (losses), net of tax	3	1	(7)	7
Available-for-sale securities:
Net unrealized gains (losses), net of tax impact of $(1), $1, $2 and $1	(3)	1	3	1
Net change	(3)	1	3	1
Cash flow hedges:
Net unrealized gains (losses), net of tax impact of $(3), $(2), $3 and $0	(110)	32	273	33
Reclassifications to net income, net of tax impact of $(5), $(1), $(9) and $(2)	(182)	20	(323)	42
Net change	(292)	52	(50)	75
Other comprehensive income (loss)	(292)	54	(54)	83
Comprehensive income	4,205	3,704	8,775	5,956
Comprehensive income (loss) attributable to noncontrolling interest	5	(6)	4	(10)
Comprehensive income attributable to Gilead	$ 4,200	$ 3,710	$ 8,771	$ 5,966