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Segments | 12 Months Ended
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Dec. 31, 2020
Segment Reporting [Abstract] |
Segments | Segments As of December 31, 2020, we had two reportable segments: the Health Plans segment, and the Other segment. Our reportable segments are consistent with how we currently manage the business and view the markets we serve. The Health Plans reportable segment includes our regulated health plan operating segments, along with the recently acquired Magellan Complete Care health plans operating segment. Because this acquisition closed on December 31, 2020, Magellan Complete Care’s operating results were insignificant to our consolidated results of operations for the year ended December 31, 2020. Management will continue to evaluate the composition of its operating and reportable segments for future filings. The Other segment, which is insignificant to our consolidated results of operations, includes certain corporate amounts not associated with or allocated to the Health Plans segment. In 2018, the Other segment also included the results of certain unregulated subsidiaries we sold in late 2018. Margin is the appropriate earnings measure for our reportable segments, based on how our chief operating decision maker currently reviews results, assesses performance, and allocates resources. The key metrics used to assess the performance of our Health Plans segment are premium revenue, medical margin and MCR. MCR represents the amount of medical care costs as a percentage of premium revenue. Therefore, the underlying margin, or the amount earned by the Health Plans segment after medical costs are deducted from premium revenue, is the most important measure of earnings reviewed by management. Margin for our Health Plans segment is also referred to as “Medical Margin.”
| Health Plans |  | Other |  | Consolidated
| (In millions)
2020 |  |  |  |  |
Total revenue | $ | 19,415 |  |  | $ | 8 |  |  | $ | 19,423 |
Margin | 2,479 |  |  | — |  |  | 2,479 |
Total assets | 8,359 |  |  | 1,173 |  |  | 9,532 |
2019 |  |  |  |  |
Total revenue | $ | 16,815 |  |  | $ | 14 |  |  | $ | 16,829 |
Margin | 2,303 |  |  | — |  |  | 2,303 |
Total assets | 5,265 |  |  | 1,522 |  |  | 6,787 |
2018 |  |  |  |  |
Total revenue | $ | 18,471 |  |  | $ | 419 |  |  | $ | 18,890 |
Margin | 2,475 |  |  | 43 |  |  | 2,518 |
Total assets | 6,165 |  |  | 989 |  |  | 7,154 |
The following table reconciles margin by segment to consolidated income before income tax expense:
| Year Ended December 31,
| 2020 |  | 2019 |  | 2018
| (In millions)
Margin: |  |  |  |  |
Health Plans | $ | 2,479 |  |  | $ | 2,303 |  |  | $ | 2,475 |
Other | — |  |  | — |  |  | 43 |
Total margin | 2,479 |  |  | 2,303 |  |  | 2,518 |
Add: other operating revenues (1) | 1,124 |  |  | 621 |  |  | 871 |
Less: other operating expenses (2) | (2,525) |  |  | (1,880) |  |  | (2,258) |
Operating income | 1,078 |  |  | 1,044 |  |  | 1,131 |
Less: other expenses, net | 117 |  |  | 72 |  |  | 132 |
Income before income tax expense | $ | 961 |  |  | $ | 972 |  |  | $ | 999 |
______________________ (1)Other operating revenues include premium tax revenue, health insurer fees reimbursed, Marketplace risk corridor judgment, investment income and other revenue. (2)Other operating expenses include general and administrative expenses, premium tax expenses, health insurer fees, depreciation and amortization, and other costs.

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- Definition The entire disclosure for reporting segments including data and tables. Reportable segments include those that meet any of the following quantitative thresholds a) it's reported revenue, including sales to external customers and intersegment sales or transfers is 10 percent or more of the combined revenue, internal and external, of all operating segments b) the absolute amount of its reported profit or loss is 10 percent or more of the greater, in absolute amount of 1) the combined reported profit of all operating segments that did not report a loss or 2) the combined reported loss of all operating segments that did report a loss c) its assets are 10 percent or more of the combined assets of all operating segments. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 31 -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8924-108599 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 34 -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8981-108599 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 21 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8721-108599 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 40 -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e9031-108599 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 32 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8933-108599 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 32 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8933-108599 Reference 7: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 26 -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8844-108599 Reference 8: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 41 -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e9038-108599 Reference 9: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 32 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8933-108599 Reference 10: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8736-108599 Reference 11: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 42 -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e9054-108599 Reference 12: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8657-108599 Reference 13: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 21 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8721-108599 Reference 14: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -URI http://asc.fasb.org/topic&trid=2134510 + Details
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