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Segments
 12 Months Ended
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 PlansOtherConsolidated
(In millions)
2020
Total revenue$19,415 $8 $19,423 
Margin 2,479 — 2,479 
Total assets8,359 1,173 9,532 
2019
Total revenue$16,815 $14 $16,829 
Margin 2,303 — 2,303 
Total assets5,265 1,522 6,787 
2018
Total revenue$18,471 $419 $18,890 
Margin 2,475 43 2,518 
Total assets6,165 989 7,154 
The following table reconciles margin by segment to consolidated income before income tax expense:
Year Ended December 31,
202020192018
(In millions)
Margin:
Health Plans$2,479 $2,303 $2,475 
Other— — 43 
Total margin2,479 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 income1,078 1,044 1,131 
Less: other expenses, net117 72 132 
Income before income tax expense$961 $972 $999 
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(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.