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Equity (Tables)
 6 Months Ended
Jun. 30, 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.
—

—

—

2,330

—

—

—

—

2,330

Other comprehensive income, net of taxes
—

—

—

—

62

—

—

—

62

Cash dividends declared on common stock
—

—

—

(2,557
)
—

—

—

—

(2,557
)
Treasury stock shares purchased
—

—

—

—

—

30

(1,573
)
—

(1,573
)
Share-based compensation plans and other
—

—

(311
)
—

—

(15
)
730

—

419

Net income attributable to noncontrolling interests
—

—

—

—

—

—

—

9

9

Distributions attributable to noncontrolling interests
—

—

—

—

—

—

—

(11
)
(11
)
Balance at June 30, 2016
3,577

$
1,788

$
39,911

$
45,121

$
(4,086
)
811

$
(39,377
)
$
89

$
43,446

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

Distributions attributable to noncontrolling interests
—

—

—

—

—

—

—

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

1,788

39,776

45,046

(5,094
)
850

(42,053
)
249

39,712