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Acquisitions - Narrative (Details) $ / shares in Units, shares in Millions, $ in Millions |  | 1 Months Ended | 3 Months Ended | 6 Months Ended
--- | --- | --- | --- | ---
Jan. 23, 2020 USD ($) $ / shares shares | Jan. 31, 2020 USD ($) shares | Jun. 30, 2020 USD ($) | Jun. 30, 2019 USD ($) | Jun. 30, 2020 USD ($) | Jun. 30, 2019 USD ($)
Business Acquisition [Line Items] |  |  |  |  |  |
Centene stock price (in usd per share) | $ / shares | $ 66.76 |  |  |  |  |
Acquisition related costs |  |  | $ 71 |  | $ 384 |
Gain on divestiture |  |  |  |  | 104 | $ 0
Centene Illinois Medicaid and Medicare Advantage Health Plans |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Gain on divestiture |  |  | $ 11 |  | 104 |
WellCare Health Plans, Inc. |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Transaction value | $ 19,555 |  |  |  |  |
Consideration transferred | 17,605 |  |  |  |  |
Consideration transferred, shares valued | 11,431 | $ 11,431 |  |  |  |
Cash paid | 6,079 |  |  |  |  |
Consideration transferred related to fair value of replacement equity awards associated with pre-combination service | $ 95 |  |  |  |  |
Common stock cancelled and converted into right to Centene common stock | 3.38 |  |  |  |  |
Cash paid per acquiree share, without interest (in usd per share) | $ / shares | $ 120.00 |  |  |  |  |
Shares issued (in shares) | shares | 171 | 171 |  |  |  |
Pro forma revenue (unaudited) |  |  |  | $ 25,325 | $ 55,527 | $ 50,494
Intangible assets | $ 7,000 |  |  |  |  |

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- Definition The pro forma revenue for a period as if the business combination or combinations had been completed at the beginning of the period. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(2) -URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(3) -URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463 + Details
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