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Significant Accounting Policies - Narrative (Details) person in Millions, patient in Millions, $ in Millions | 3 Months Ended | 6 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
Jun. 30, 2020 USD ($) person building clinic patient state | Jun. 30, 2019 USD ($) | Jun. 30, 2020 USD ($) person building clinic patient Segment state | Jun. 30, 2019 USD ($) | Dec. 31, 2018 USD ($) | Mar. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Mar. 31, 2019 USD ($)
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |
Number of pharmacy plan members | person | 103 |  | 103 |  |  |  |  |  |
Number of patients served per year | patient | 1 |  | 1 |  |  |  |  |  |
Number of reportable segments | Segment |  |  | 4 |  |  |  |  |  |
Allowance for credit losses | $ 342 |  | $ 342 |  |  |  |  | $ 319 |
Health insurer fee | 248 |  | 519 |  |  |  |  |  |
Related party transaction, expenses from transactions with related party | 3 | $ 2 | 23 | $ 12 |  |  |  |  |
Related party transaction, other revenues from transactions with related party | 22 | 27 | $ 43 | 52 |  |  |  |  |
Accounting Standards Update [Extensible List] |  |  | us-gaap:AccountingStandardsUpdate201613Member |  | us-gaap:AccountingStandardsUpdate201602Member |  |  |  |
Change in Accounting Principle, Accounting Standards Update, Transition Option Elected [Extensible List] |  |  | cvs:AccountingStandardsUpdate201613ModifiedRetrospectiveMember |  |  |  |  |  |
Cumulative adjustment to retained earnings as a result of new accounting standard adoption | $ 68,355 | 61,599 | $ 68,355 | 61,599 | $ 58,543 |  | $ 65,474 | 64,170 | $ 60,006
Heartland Healthcare Services |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |
Number of states in which entity operates | state | 4 |  | 4 |  |  |  |  |  |
Retail/ LTC |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |
Number of stores | building | 9,900 |  | 9,900 |  |  |  |  |  |
Number of walk in medical clinics | clinic | 1,100 |  | 1,100 |  |  |  |  |  |
Health Care Benefits |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |
Number of people served through health insurance products and related services | person | 34 |  | 34 |  |  |  |  |  |
Retained Earnings |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |
Cumulative adjustment to retained earnings as a result of new accounting standard adoption | $ 48,768 | $ 43,136 | $ 48,768 | $ 43,136 | 40,911 |  | $ 46,455 | 45,108 | $ 41,859
Cumulative Effect, Period of Adoption, Adjustment |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |
Cumulative adjustment to retained earnings as a result of new accounting standard adoption |  |  |  |  | 178 | [1] |  | (3) |
Cumulative Effect, Period of Adoption, Adjustment | Retained Earnings |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |
Cumulative adjustment to retained earnings as a result of new accounting standard adoption |  |  |  |  | $ 178 | [1] |  | $ (3) |
[1] | Reflects the adoption of Accounting Standards Update (“ASU”) 2016-02, Leases (Topic 842), which resulted in an increase to retained earnings of $178 million during the three months ended March 31, 2019.

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http://asc.fasb.org/extlink&oid=115929471&loc=d3e21914-107793 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 250 -SubTopic 10 -Section 50 -Paragraph 7 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109234566&loc=d3e22644-107794 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 10 -Section 65 -Paragraph 4 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=121646688&loc=SL121648383-210437 Reference 7: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 65 -Paragraph 2 -Subparagraph (f)(2) -URI http://asc.fasb.org/extlink&oid=121370832&loc=SL117420844-207641 Reference 8: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 45 -Paragraph 16 -URI 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