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Summary of Quarterly Data (Unaudited) (Tables)
 12 Months Ended
Dec. 31, 2017
Quarterly Financial Data [Abstract]  
Summary of Quarterly Data
2017 Quarter
Mar 31
Jun 30
Sep 30
Dec 31
Net sales
$
2,955

$
3,012

$
3,006

$
3,471

Gross profit
1,962

1,990

1,982

2,239

Earnings before income taxes
499

444

471

649

Net earnings
444

391

434

(249
)
Net earnings per share of common stock:
 
 
Basic
$
1.19

$
1.04

$
1.16

$
(0.66
)
Diluted
$
1.17

$
1.03

$
1.14

$
(0.66
)
Market price of common stock:
 
 
 
 
High
$
133.59

$
145.62

$
148.84

$
160.62

Low
$
116.50

$
129.82

$
137.70

$
141.68

Dividends declared per share of common stock
$
0.425

$
0.425

$
0.425

$
0.47

2016 Quarter
Mar 31
Jun 30
Sep 30
Dec 31
Net sales
$
2,495

$
2,840

$
2,833

$
3,157

Gross profit
1,694

1,842

1,873

2,086

Earnings before income taxes
481

433

419

588

Net earnings
402

380

355

510

Net earnings per share of common stock:
 
 
Basic
$
1.08

$
1.02

$
0.95

$
1.36

Diluted
$
1.07

$
1.00

$
0.94

$
1.34

Market price of common stock:
 
 
 
 
High
$
107.95

$
119.83

$
123.55

$
121.84

Low
$
86.68

$
106.26

$
109.75

$
106.48

Dividends declared per share of common stock
$
0.38

$
0.38

$
0.38

$
0.425