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Condensed Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Statement of Comprehensive Income [Abstract]
Net income	$ 2,099	$ 2,712	$ 5,457	$ 8,480
Other comprehensive income (loss):
Net foreign currency translation gain (loss), net of tax	1	(4)	(17)	(51)
Available-for-sale securities:
Net unrealized gain, net of tax impact of $0, $1, $0 and $4, respectively	31	185	25	311
Reclassifications to net income, net of tax impact of $0, $0, $0 and $(8), respectively	0	(1)	4	(7)
Net change	31	184	29	304
Cash flow hedges:
Net unrealized gain (loss), net of tax impact of $0, $(2), $1 and $(11), respectively	(6)	(76)	51	(278)
Reclassifications to net income, net of tax impact of $0, $1, $0 and $0, respectively	8	25	101	(4)
Net change	2	(51)	152	(282)
Other comprehensive income (loss)	34	129	164	(29)
Comprehensive income	2,133	2,841	5,621	8,451
Comprehensive income (loss) attributable to noncontrolling interest	2	(6)	5	(13)
Comprehensive income attributable to Gilead	$ 2,131	$ 2,847	$ 5,616	$ 8,464

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