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ACCUMULATED OTHER COMPREHENSIVE EARNINGS (LOSSES) (AOCE) (Tables)
 12 Months Ended
Dec. 31, 2019
Stockholders' Equity Note [Abstract]  
Schedule of AOCE

The components of AOCE consisted of the following (in millions of dollars):

 
Foreign Currency Translation and Other
Defined Postretirement Benefit Plan
Other Employment-related Benefit Plans
Total
Foreign Currency Translation Attributable to Noncontrolling Interests
AOCE Attributable to W.W. Grainger, Inc.
Balance at January 1, 2017, net of tax
$
(316
)
$
25

$
(5
)
$
(296
)
$
(23
)
$
(273
)
Other comprehensive earnings (loss) before reclassifications, net of tax
75

86

1

162

4

158

Amounts reclassified to Net earnings
18

(38
)
—

(20
)
—

(20
)
Net current period activity
$
93

$
48

$
1

$
142

$
4

$
138

Balance at December 31, 2017, net of tax
$
(223
)
$
73

$
(4
)
$
(154
)
$
(19
)
$
(135
)
Other comprehensive earnings (loss) before reclassifications, net of tax
(43
)
4

(1
)
(40
)
3

(43
)
Amounts reclassified to Net earnings
2

(10
)
—

(8
)
—

(8
)
Amounts reclassified to Retained earnings
—

15

—

15

—

15

Net current period activity
$
(41
)
$
9

$
(1
)
$
(33
)
$
3

$
(36
)
Balance at December 31, 2018, net of tax
$
(264
)
$
82

$
(5
)
$
(187
)
$
(16
)
$
(171
)
Other comprehensive earnings (loss) before reclassifications, net of tax
25

8

(3
)
30

3

27

Amounts reclassified to Net earnings
1

(11
)
—

(10
)
—

(10
)
Net current period activity
26

(3
)
(3
)
20

3

17

Balance at December 31, 2019, net of tax
$
(238
)
$
79

$
(8
)
$
(167
)
$
(13
)
$
(154
)