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Proposed Acquisition of Aetna (Details) - Aetna $ / shares in Units, item in Millions, $ in Billions | Dec. 03, 2017 USD ($) $ / shares shares | Oct. 10, 2018 item
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Business Acquisition |  |
Cash consideration for shares acquired (dollars per share) | $ / shares | $ 145.00 |
Shares exchanged for each share acquired (in shares) | shares | 0.8378 |
The assigned value per share of acquiree (dollars per share) | $ / shares | $ 207 |
Assigned value of acquiree | $ | $ 69.0 |
Weighted average share price analysis | 5 days |
Consideration transferred | $ | $ 77.0 |
Potential termination fees | $ | $ 2.1 |
Number of members in Medicare Part D prescription drug plan. | item |  | 2.2
Aetna Acquisition |  |
Business Acquisition |  |
Share price (dollars per share) | $ / shares | $ 74.21 |

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- Definition Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6578-128477 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6613-128477 + Details
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