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Significant Accounting Policies - Narrative (Details) person in Millions, patient in Millions, $ in Millions | 3 Months Ended | 9 Months Ended |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Sep. 30, 2020 USD ($) patient clinic state person building | Sep. 30, 2019 USD ($) | Sep. 30, 2020 USD ($) patient Segment clinic state person building | Sep. 30, 2019 USD ($) | Jun. 30, 2020 USD ($) | Mar. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Jun. 30, 2019 USD ($) | Mar. 31, 2019 USD ($) | Dec. 31, 2018 USD ($)
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 | $ 363 |  | $ 363 |  |  |  | $ 319 |  |  |  |
Health insurer fee | 255 |  | 774 |  |  |  |  |  |  |  |
Non tax-deductible health insurance fee |  |  | 1,000 |  |  |  |  |  |  |  |
Related party transaction, expenses from transactions with related party | 5 | $ 14 | 28 | $ 26 |  |  |  |  |  |  |
Related party transaction, other revenues from transactions with related party | 15 | 20 | $ 58 | 72 |  |  |  |  |  |  |
Accounting Standards Update [Extensible List] |  |  | us-gaap:AccountingStandardsUpdate201613Member |  |  |  |  |  |  |  |
Change in Accounting Principle, Accounting Standards Update, Transition Option Elected [Extensible List] |  |  | us-gaap:AccountingStandardsUpdate201615ProspectiveMember |  |  |  |  |  |  |  |
Cumulative adjustment to retained earnings as a result of new accounting standard adoption | $ 69,112 | 62,933 | $ 69,112 | 62,933 | $ 68,355 | $ 65,474 | 64,170 | $ 61,599 | $ 60,006 | $ 58,543 |
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 | 33 |  | 33 |  |  |  |  |  |  |  |
Retained Earnings |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Cumulative adjustment to retained earnings as a result of new accounting standard adoption | $ 49,328 | $ 44,017 | $ 49,328 | $ 44,017 | $ 48,768 | $ 46,455 | 45,108 | $ 43,136 | $ 41,859 | 40,911 |
Cumulative Effect, Period of Adoption, Adjustment |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Cumulative adjustment to retained earnings as a result of new accounting standard adoption |  |  |  |  |  |  | (3) |  |  | 178 | [1]
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 |  |  |  |  |  |  | $ (3) |  |  | $ 178 | [1]
[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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