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Equity (Tables)
 9 Months Ended
Sep. 30, 2016
Equity [Abstract]  
Shareholders' Equity
 
  
Common Stock
Other
Paid-In
Capital
Retained
Earnings
Accumulated
Other
Comprehensive
Loss
 
Treasury Stock
Non-
Controlling
Interests
Total
($ and shares in millions)
Shares
Par Value
Shares
Cost
Balance at January 1, 2015
3,577

$
1,788

$
40,423

$
46,021

$
(4,323
)
739

$
(35,262
)
$
144

$
48,791

Net income attributable to Merck & Co., Inc.
—

—

—

3,465

—

—

—

—

3,465

Other comprehensive loss, net of tax
—

—

—

—

(250
)
—

—

—

(250
)
Cash dividends declared on common stock
—

—

—

(3,826
)
—

—

—

—

(3,826
)
Treasury stock shares purchased
—

—

—

—

—

53

(3,005
)
—

(3,005
)
Share-based compensation plans and other
—

—

(263
)
—

—

(17
)
840

—

577

Changes in noncontrolling ownership interests
—

—

(21
)
—

—

—

—

(55
)
(76
)
Net income attributable to noncontrolling interests
—

—

—

—

—

—

—

12

12

Distributions attributable to noncontrolling interests
—

—

—

—

—

—

—

(9
)
(9
)
Balance at September 30, 2015
3,577

$
1,788

$
40,139

$
45,660

$
(4,573
)
775

$
(37,427
)
$
92

$
45,679

Balance at January 1, 2016
3,577

$
1,788

$
40,222

$
45,348

$
(4,148
)
796

$
(38,534
)
$
91

$
44,767

Net income attributable to Merck & Co., Inc.
—

—

—

4,515

—

—

—

—

4,515

Other comprehensive loss, net of tax
—

—

—

—

(104
)
—

—

—

(104
)
Cash dividends declared on common stock
—

—

—

(3,835
)
—

—

—

—

(3,835
)
Treasury stock shares purchased
—

—

—

—

—

44

(2,418
)
—

(2,418
)
Share-based compensation plans and other
—

—

(325
)
—

—

(25
)
1,235

—

910

Changes in noncontrolling ownership interests
—

—

—

—

—

—

—

124

124

Net income attributable to noncontrolling interests
—

—

—

—

—

—

—

13

13

Distributions attributable to noncontrolling interests
—

—

—

—

—

—

—

(15
)
(15
)
Balance at September 30, 2016
3,577

$
1,788

$
39,897

$
46,028

$
(4,252
)
815

$
(39,717
)
$
213

$
43,957