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ACCUMULATED OTHER COMPREHENSIVE EARNINGS (LOSSES) (AOCE) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]      
Beginning balance $ 3,441 $ 2,735 $ 2,160
Total other comprehensive earnings (losses) (138) (13) (118)
Ending balance 3,703 3,441 2,735
Total      
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]      
Beginning balance (257) (244)  
Other comprehensive earnings (loss) before reclassifications – net of tax (125) 0  
Amounts reclassified to net earnings (13) (13)  
Total other comprehensive earnings (losses) (138) (13)  
Ending balance (395) (257) (244)
Foreign Currency Translation and Other      
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]      
Beginning balance (331) (320)  
Other comprehensive earnings (loss) before reclassifications – net of tax (137) (11)  
Amounts reclassified to net earnings 0 0  
Total other comprehensive earnings (losses) (137) (11)  
Ending balance (468) (331) (320)
Foreign Currency Translation Attributable to Noncontrolling Interests      
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]      
Beginning balance (85) (64)  
Other comprehensive earnings (loss) before reclassifications – net of tax (36) (21)  
Amounts reclassified to net earnings 0 0  
Total other comprehensive earnings (losses) (36) (21)  
Ending balance (121) (85) (64)
AOCE Attributable to W.W. Grainger, Inc.      
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]      
Beginning balance (172) (180) (96)
Other comprehensive earnings (loss) before reclassifications – net of tax (89) 21  
Amounts reclassified to net earnings (13) (13)  
Total other comprehensive earnings (losses) (102) 8 (84)
Ending balance (274) (172) (180)
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 77 82  
Other comprehensive earnings (loss) before reclassifications – net of tax 12 8  
Amounts reclassified to net earnings (13) (13)  
Total other comprehensive earnings (losses) (1) (5)  
Ending balance 76 77 82
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 (3) (6)  
Other comprehensive earnings (loss) before reclassifications – net of tax 0 3  
Amounts reclassified to net earnings 0 0  
Total other comprehensive earnings (losses) 0 3  
Ending balance $ (3) $ (3) $ (6)