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Equity (Tables)
 3 Months Ended
Mar. 31, 2017
Equity [Abstract]  
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, 2016
3,577

$
1,788

$
40,222

$
45,348

$
(4,148
)
796

$
(38,534
)
$
91

$
44,767

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

—

—

1,125

—

—

—

—

1,125

Other comprehensive loss, net of tax
—

—

—

—

(46
)
—

—

—

(46
)
Cash dividends declared on common stock
—

—

—

(1,281
)
—

—

—

—

(1,281
)
Treasury stock shares purchased
—

—

—

—

—

18

(913
)
—

(913
)
Share-based compensation plans and other
—

—

(77
)
—

—

(6
)
322

—

245

Net income attributable to noncontrolling interests
—

—

—

—

—

—

—

5

5

Distributions attributable to noncontrolling interests
—

—

—

—

—

—

—

(1
)
(1
)
Balance at March 31, 2016
3,577

$
1,788

$
40,145

$
45,192

$
(4,194
)
808

$
(39,125
)
$
95

$
43,901

Balance at January 1, 2017
3,577

$
1,788

$
39,939

$
44,133

$
(5,226
)
828

$
(40,546
)
$
220

$
40,308

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

—

—

1,551

—

—

—

—

1,551

Other comprehensive income, net of tax
—

—

—

—

146

—

—

—

146

Cash dividends declared on common stock
—

—

—

(1,297
)
—

—

—

—

(1,297
)
Treasury stock shares purchased
—

—

—

—

—

16

(1,019
)
—

(1,019
)
Share-based compensation plans and other
—

—

(40
)
—

—

(7
)
408

—

368

Acquisition of Vallée
—

—

—

—

—

—

—

25

25

Net income attributable to noncontrolling interests
—

—

—

—

—

—

—

5

5

Other changes in noncontrolling ownership interests
—

—

—

—

—

—

—

1

1

Balance at March 31, 2017
3,577

$
1,788

$
39,899

$
44,387

$
(5,080
)
837

$
(41,157
)
$
251

$
40,088