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ACCUMULATED OTHER COMPREHENSIVE EARNINGS (LOSSES) (AOCE) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]      
Beginning balance $ 2,093 $ 2,060 $ 2,093
Net current period activity (64) 105 20
Ending balance 2,160 2,093 2,060
Foreign Currency Translation and Other      
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]      
Beginning balance (155) (238) (264)
Other comprehensive earnings (loss) before reclassifications – net of tax (64) 36 25
Amounts reclassified to Net earnings 0 47 1
Net current period activity (64) 83 26
Ending balance (219) (155) (238)
Total      
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]      
Beginning balance (62) (167) (187)
Other comprehensive earnings (loss) before reclassifications – net of tax (50) 69 30
Amounts reclassified to Net earnings (14) 36 (10)
Net current period activity (64) 105 20
Ending balance (126) (62) (167)
Foreign Currency Translation Attributable to Noncontrolling Interests      
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]      
Beginning balance (1) (13) (16)
Other comprehensive earnings (loss) before reclassifications – net of tax (29) 12 3
Amounts reclassified to Net earnings 0 0 0
Net current period activity (29) 12 3
Ending balance (30) (1) (13)
AOCE Attributable to W.W. Grainger, Inc.      
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]      
Beginning balance (61) (154) (171)
Other comprehensive earnings (loss) before reclassifications – net of tax (21) 57 27
Amounts reclassified to Net earnings (14) 36 (10)
Net current period activity (35) 93 17
Ending balance (96) (61) (154)
Defined Postretirement Benefit Plan | Accumulated Defined Benefit Plans Adjustment Including Portion Attributable to Noncontrolling Interest      
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]      
Beginning balance 101 79 82
Other comprehensive earnings (loss) before reclassifications – net of tax 12 33 8
Amounts reclassified to Net earnings (14) (11) (11)
Net current period activity (2) 22 (3)
Ending balance 99 101 79
Other Employment-related Benefit Plans | Accumulated Defined Benefit Plans Adjustment Including Portion Attributable to Noncontrolling Interest      
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]      
Beginning balance (8) (8) (5)
Other comprehensive earnings (loss) before reclassifications – net of tax 2 0 (3)
Amounts reclassified to Net earnings 0 0 0
Net current period activity 2 0 (3)
Ending balance $ (6) $ (8) $ (8)