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Equity (Tables)
 6 Months Ended
Jun. 30, 2018
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, 2017
3,577

$
1,788

$
39,939

$
44,133

$
(5,226
)
828

$
(40,546
)
$
220

$
40,308

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

—

—

3,496

—

—

—

—

3,496

Other comprehensive income, net of taxes
—

—

—

—

132

—

—

—

132

Cash dividends declared on common stock
—

—

—

(2,583
)
—

—

—

—

(2,583
)
Treasury stock shares purchased
—

—

—

—

—

34

(2,153
)
—

(2,153
)
Share-based compensation plans and other
—

—

(163
)
—

—

(12
)
646

—

483

Acquisition of Vallée
—

—

—

—

—

—

—

25

25

Net income attributable to noncontrolling interests
—

—

—

—

—

—

—

11

11

Other changes in noncontrolling ownership interests
—

—

—

—

—

—

—

(7
)
(7
)
Balance at June 30, 2017
3,577

$
1,788

$
39,776

$
45,046

$
(5,094
)
850

$
(42,053
)
$
249

$
39,712

Balance at January 1, 2018
3,577

$
1,788

$
39,902

$
41,350

$
(4,910
)
880

$
(43,794
)
$
233

$
34,569

Adoption of new accounting standards (see Note 1)
—

—

—

322

(274
)
—

—

—

48

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

—

—

2,443

—

—

—

—

2,443

Other comprehensive income, net of taxes
—

—

—

—

62

—

—

—

62

Cash dividends declared on common stock
—

—

—

(2,592
)
—

—

—

—

(2,592
)
Treasury stock shares purchased
—

—

—

—

—

37

(2,162
)
—

(2,162
)
Share-based compensation plans and other
—

—

(161
)
—

—

(10
)
555

—

394

Net income attributable to noncontrolling interests
—

—

—

—

—

—

—

14

14

Distributions attributable to noncontrolling interests
—

—

—

—

—

—

—

(10
)
(10
)
Balance at June 30, 2018
3,577

$
1,788

$
39,741

$
41,523

$
(5,122
)
907

$
(45,401
)
$
237

$
32,766