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v3.19.1

Segment Information (Details) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2019 USD ($) segment | Mar. 31, 2018 USD ($)
Segment Reporting [Abstract] |  |
Number of operating segments | segment | 2 |
Segment Reporting Information [Line Items] |  |
Total revenues | $ 18,444 | $ 13,194
Earnings from operations | 685 | 540
Eliminations |  |
Segment Reporting Information [Line Items] |  |
Total revenues | (2,484) | (2,256)
Managed Care |  |
Segment Reporting Information [Line Items] |  |
Total revenues | 17,722 | 12,474
Earnings from operations | 615 | 470
Managed Care | Operating Segments |  |
Segment Reporting Information [Line Items] |  |
Total revenues | 17,687 | 12,449
Managed Care | Eliminations |  |
Segment Reporting Information [Line Items] |  |
Total revenues | 35 | 25
Specialty Services |  |
Segment Reporting Information [Line Items] |  |
Total revenues | 3,206 | 2,976
Earnings from operations | 70 | 70
Specialty Services | Operating Segments |  |
Segment Reporting Information [Line Items] |  |
Total revenues | 757 | 745
Specialty Services | Eliminations |  |
Segment Reporting Information [Line Items] |  |
Total revenues | $ 2,449 | $ 2,231

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- Definition Number of operating segments. An operating segment is a component of an enterprise: (a) that engages in business activities from which it may earn revenues and incur expenses (including revenues and expenses relating to transactions with other components of the same enterprise), (b) whose operating results are regularly reviewed by the enterprise's chief operating decision maker to make decisions about resources to be allocated to the segment and assess its performance, and (c) for which discrete financial information is available. An operating segment may engage in business activities for which it has yet to earn revenues, for example, start-up operations may be operating segments before earning revenues. + References No definition available. + Details
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- Definition Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8736-108599 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1) -URI http://asc.fasb.org/extlink&oid=115205541&loc=SL114868664-224227 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 32 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8933-108599 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8736-108599 + Details
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