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ACCUMULATED OTHER COMPREHENSIVE EARNINGS (LOSSES) (AOCE) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]      
Beginning balance $ 2,160 $ 2,093 $ 2,060
Net current period activity (118) (64) 105
Ending balance 2,735 2,160 2,093
Foreign Currency Translation and Other      
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]      
Beginning balance (219) (155) (238)
Other comprehensive earnings (loss) before reclassifications – net of tax (101) (64) 36
Amounts reclassified to net earnings 0 0 47
Net current period activity (101) (64) 83
Ending balance (320) (219) (155)
Total      
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]      
Beginning balance (126) (62) (167)
Other comprehensive earnings (loss) before reclassifications – net of tax (105) (50) 69
Amounts reclassified to net earnings (13) (14) 36
Net current period activity (118) (64) 105
Ending balance (244) (126) (62)
Foreign Currency Translation Attributable to Noncontrolling Interests      
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]      
Beginning balance (30) (1) (13)
Other comprehensive earnings (loss) before reclassifications – net of tax (34) (29) 12
Amounts reclassified to net earnings 0 0 0
Net current period activity (34) (29) 12
Ending balance (64) (30) (1)
AOCE Attributable to W.W. Grainger, Inc.      
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]      
Beginning balance (96) (61) (154)
Other comprehensive earnings (loss) before reclassifications – net of tax (71) (21) 57
Amounts reclassified to net earnings (13) (14) 36
Net current period activity (84) (35) 93
Ending balance (180) (96) (61)
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 99 101 79
Other comprehensive earnings (loss) before reclassifications – net of tax (4) 12 33
Amounts reclassified to net earnings (13) (14) (11)
Net current period activity (17) (2) 22
Ending balance 82 99 101
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 (6) (8) (8)
Other comprehensive earnings (loss) before reclassifications – net of tax 0 2 0
Amounts reclassified to net earnings 0 0 0
Net current period activity 0 2 0
Ending balance $ (6) $ (6) $ (8)