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Equity (Tables)
 3 Months Ended
Mar. 31, 2020
Equity [Abstract]  
Equity
 
Three Months Ended March 31,
 
  
Common Stock
Other
Paid-In
Capital
Retained
Earnings
Accumulated
Other
Comprehensive
Loss
 
Treasury Stock
Non-
controlling
Interests
Total
($ and shares in millions except per share amounts)
Shares
Par Value
Shares
Cost
Balance at January 1, 2019
3,577

$
1,788

$
38,808

$
42,579

$
(5,545
)
985

$
(50,929
)
$
181

$
26,882

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

—

—

2,915

—

—

—

—

2,915

Other comprehensive income, net of taxes
—

—

—

—

199

—

—

—

199

Cash dividends declared on common stock ($0.55 per share)
—

—

—

(1,429
)
—

—

—

—

(1,429
)
Treasury stock shares purchased
—

—

—

—

—

14

(1,090
)
—

(1,090
)
Share-based compensation plans and other
—

—

(40
)
—

—

(5
)
283

—

243

Net loss attributable to noncontrolling interests
—

—

—

—

—

—

—

(53
)
(53
)
Other changes in noncontrolling ownership interests
—

—

—

—

—

—

—

3

3

Balance at March 31, 2019
3,577

$
1,788

$
38,768

$
44,065

$
(5,346
)
994

$
(51,736
)
$
131

$
27,670

Balance at January 1, 2020
3,577

$
1,788

$
39,660

$
46,602

$
(6,193
)
1,038

$
(55,950
)
$
94

$
26,001

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

—

—

3,219

—

—

—

—

3,219

Other comprehensive loss, net of taxes
—

—

—

—

(198
)
—

—

—

(198
)
Cash dividends declared on common stock ($0.61 per share)
—

—

—

(1,549
)
—

—

—

—

(1,549
)
Treasury stock shares purchased
—

—

—

—

—

16

(1,281
)
—

(1,281
)
Share-based compensation plans and other
—

—

37

—

—

(1
)
70

—

107

Other changes in noncontrolling ownership interests
—

—

—

—

—

—

—

1

1

Balance at March 31, 2020
3,577

$
1,788

$
39,697

$
48,272

$
(6,391
)
1,053

$
(57,161
)
$
95

$
26,300