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Stockholders' Equity (Tables)
 3 Months Ended
Mar. 31, 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
Balance at December 31, 2017
 
1,308

 
$
1

 
$
1,264

 
$
165

 
$
19,012

 
$
59

 
$
20,501

Net income
 
—

 
—

 
—

 
—

 
1,538

 
1

 
1,539

Other comprehensive loss, net of tax
 
—

 
—

 
—

 
(42
)
 
—

 
—

 
(42
)
Issuances under employee stock purchase plan
 
1

 
—

 
48

 
—

 
—

 
—

 
48

Issuances under equity incentive plans
 
5

 
—

 
64

 
—

 
—

 
—

 
64

Stock-based compensation
 
—

 
—

 
224

 
—

 
—

 
—

 
224

Repurchases of common stock
 
(14
)
 
—

 
(36
)
 
—

 
(1,085
)
 
—

 
(1,121
)
Dividends declared
 
—

 
—

 
—

 
—

 
(752
)
 
—

 
(752
)
Cumulative effect from the adoption of new accounting standards
 
—

 
—

 
—

 
(293
)
 
483

 
—

 
190

Balance at March 31, 2018
 
1,300

 
$
1

 
$
1,564

 
$
(170
)
 
$
19,196

 
$
60

 
$
20,651
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

Net unrealized gain (loss)
 
7

 
(36
)
 
(61
)
 
(90
)
Reclassifications to net income
 
—

 
—

 
48

 
48

Reclassifications to retained earnings as a result of the adoption of new accounting standards
 
—

 
(293
)
 
—

 
(293
)
Net current period other comprehensive income (loss)
 
7

 
(329
)
 
(13
)
 
(335
)
Balance at March 31, 2018
 
$
92

 
$
(135
)
 
$
(127
)
 
$
(170
)