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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%

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