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BUSINESS SEGMENT INFORMATION (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Business Segment Information                      
Net sales $ 5,251       $ 4,848            
Corporate                      
Interest expense - net 70       61            
Pension and other postretirement benefits expense (43)       (51)            
Other corporate expense - net (2)       (6)            
Income before income taxes 565       467            
Income tax expense 78       33            
Net income 487       434            
Less net loss for noncontrolling interests 1       0            
Net income attributable to Eaton ordinary shareholders 488       434            
New Business Segments - Results of Operations                      
Net sales 5,251       4,848            
Acquisition integration charges 0       1            
Electrical Products [Member]                      
New Business Segments - Results of Operations                      
Acquisition integration charges 0       1            
Total business segments [Member]                      
Business Segment Information                      
Net sales 5,251       4,848            
Segment operating profit 796       699            
New Business Segments - Results of Operations                      
Net sales 5,251       4,848            
Operating profit 796       699            
Total business segments [Member] | Electrical Products [Member]                      
Business Segment Information                      
Net sales 1,732 $ 1,750 $ 1,785 $ 1,731 1,651 $ 1,665 $ 1,705 $ 1,717 $ 1,616 $ 6,917 $ 6,703
Segment operating profit 307 318 330 299 286 305 317 304 260 1,233 1,186
New Business Segments - Results of Operations                      
Net sales 1,732 1,750 1,785 1,731 1,651 1,665 1,705 1,717 1,616 6,917 6,703
Operating profit 307 $ 318 $ 330 $ 299 $ 286 $ 305 $ 317 $ 304 $ 260 $ 1,233 $ 1,186
Operating margin   18.20% 18.50% 17.30% 17.30% 18.30% 18.60% 17.70% 16.10% 17.80% 17.70%
Acquisition integration charges   $ 1 $ 1 $ 1 $ 1 $ 1 $ 1 $ 1 $ 0 $ 4 $ 3
Total business segments [Member] | Electrical Systems and Services [Member]                      
Business Segment Information                      
Net sales 1,381       1,333            
Segment operating profit 167       155            
New Business Segments - Results of Operations                      
Net sales 1,381       1,333            
Operating profit 167       155            
Total business segments [Member] | Hydraulics [Member]                      
Business Segment Information                      
Net sales 710       587            
Segment operating profit 90       60            
New Business Segments - Results of Operations                      
Net sales 710       587            
Operating profit 90       60            
Total business segments [Member] | Aerospace [Member]                      
Business Segment Information                      
Net sales 458       428            
Segment operating profit 89       79            
New Business Segments - Results of Operations                      
Net sales 458       428            
Operating profit 89       79            
Total business segments [Member] | Vehicle [Member]                      
Business Segment Information                      
Net sales 893 837 858 845 786 739 784 825 793 3,326 3,141
Segment operating profit 132 142 150 141 108 97 122 135 117 541 471
New Business Segments - Results of Operations                      
Net sales 893 837 858 845 786 739 784 825 793 3,326 3,141
Operating profit 132 $ 142 $ 150 $ 141 $ 108 $ 97 $ 122 $ 135 $ 117 $ 541 $ 471
Operating margin   17.00% 17.50% 16.70% 13.70% 13.10% 15.60% 16.40% 14.80% 16.30% 15.00%
Total business segments [Member] | eMobility [Member]                      
Business Segment Information                      
Net sales 77 $ 73 $ 75 $ 72 $ 63 $ 63 $ 64 $ 73 $ 66 $ 283 $ 266
Segment operating profit 11 10 16 13 11 11 14 20 12 50 57
New Business Segments - Results of Operations                      
Net sales 77 73 75 72 63 63 64 73 66 283 266
Operating profit 11 $ 10 $ 16 $ 13 $ 11 $ 11 $ 14 $ 20 $ 12 $ 50 $ 57
Operating margin   13.70% 21.30% 18.10% 17.50% 17.50% 21.90% 27.40% 18.20% 17.70% 21.40%
Corporate [Member]                      
Corporate                      
Amortization of intangible assets (98)       $ (94)            
Interest expense - net (70)       (61)            
Pension and other postretirement benefits expense (2)       (11)            
Other corporate expense - net $ (61)       (66)            
Before acquisition integration charges [Member] | Total business segments [Member] | Electrical Products [Member]                      
Business Segment Information                      
Segment operating profit   $ 319 $ 331 $ 300 287 $ 306 $ 318 $ 305 $ 260 $ 1,237 $ 1,189
New Business Segments - Results of Operations                      
Operating profit   $ 319 $ 331 $ 300 $ 287 $ 306 $ 318 $ 305 $ 260 $ 1,237 $ 1,189
Operating margin   18.20% 18.50% 17.30% 17.40% 18.40% 18.70% 17.80% 16.10% 17.90% 17.70%