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Segment and Related Information (Tables) | 3 Months Ended
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Mar. 31, 2018
Segment and Related Information |
Reportable Segments | Summarized financial information concerning our reportable segments for the three months ended March 31 is shown in the following table (in millions):
|  | Gross |  | Intercompany |  | Net |  | Income
|  | Operating |  | Operating |  | Operating |  | from
|  | Revenues |  | Revenues |  | Revenues |  | Operations
2018 |  |  |  |  |  |  |  |  |  |  |  |
Solid Waste: |  |  |  |  |  |  |  |  |  |  |  |
Tier 1 |  | $ | 1,373 |  | $ | (241) |  | $ | 1,132 |  | $ | 365
Tier 2 |  |  | 613 |  |  | (111) |  |  | 502 |  |  | 122
Tier 3 |  |  | 1,633 |  |  | (309) |  |  | 1,324 |  |  | 291
Solid Waste |  |  | 3,619 |  |  | (661) |  |  | 2,958 |  |  | 778
Other |  |  | 607 |  |  | (54) |  |  | 553 |  |  | (23)
|  |  | 4,226 |  |  | (715) |  |  | 3,511 |  |  | 755
Corporate and Other |  |  | — |  |  | — |  |  | — |  |  | (147)
Total |  | $ | 4,226 |  | $ | (715) |  | $ | 3,511 |  | $ | 608
2017 |  |  |  |  |  |  |  |  |  |  |  |
Solid Waste: |  |  |  |  |  |  |  |  |  |  |  |
Tier 1 |  | $ | 1,340 |  | $ | (238) |  | $ | 1,102 |  | $ | 366
Tier 2 |  |  | 592 |  |  | (101) |  |  | 491 |  |  | 116
Tier 3 |  |  | 1,577 |  |  | (285) |  |  | 1,292 |  |  | 268
Solid Waste |  |  | 3,509 |  |  | (624) |  |  | 2,885 |  |  | 750
Other |  |  | 603 |  |  | (48) |  |  | 555 |  |  | (32)
|  |  | 4,112 |  |  | (672) |  |  | 3,440 |  |  | 718
Corporate and Other |  |  | — |  |  | — |  |  | — |  |  | (160)
Total |  | $ | 4,112 |  | $ | (672) |  | $ | 3,440 |  | $ | 558
Summary of operating revenues mix | The mix of operating revenues from our major lines of business for the three months ended March 31 are as follows (in millions):
|  | 2018 |  | 2017
Commercial |  | $ | 955 |  | $ | 911
Residential |  |  | 614 |  |  | 621
Industrial |  |  | 637 |  |  | 603
Other |  |  | 101 |  |  | 100
Total collection |  |  | 2,307 |  |  | 2,235
Landfill |  |  | 805 |  |  | 739
Transfer |  |  | 375 |  |  | 366
Recycling |  |  | 312 |  |  | 372
Other (a) |  |  | 427 |  |  | 400
Intercompany (b) |  |  | (715) |  |  | (672)
Total |  | $ | 3,511 |  | $ | 3,440
| (a) |  | The “Other” line of business includes (i) our WMSBS organization; (ii) our landfill gas-to-energy operations; (iii) certain services within our EES organization, including our construction and remediation services and our services associated with the disposal of fly ash and (iv) certain other expanded service offerings and solutions. In addition, our “Other” line of business reflects the results of non-operating entities that provide financial assurance and self-insurance support, net of intercompany activity.
| (b) |  | Intercompany revenues between lines of business are eliminated in the Condensed Consolidated Financial Statements included within this report.

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- Definition Tabular disclosure of the profit or loss and total assets for each reportable segment. An entity discloses certain information on each reportable segment if the amounts (a) are included in the measure of segment profit or loss reviewed by the chief operating decision maker or (b) are otherwise regularly provided to the chief operating decision maker, even if not included in that measure of segment profit or loss. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 30 -URI http://asc.fasb.org/extlink&oid=68060357&loc=d3e8906-108599 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 25 -URI http://asc.fasb.org/extlink&oid=68060357&loc=d3e8813-108599 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 21 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=68060357&loc=d3e8721-108599 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -URI http://asc.fasb.org/extlink&oid=68060357&loc=d3e8736-108599 + Details
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