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Significant Accounting Policies - Narrative (Details) person in Millions, $ in Millions | 3 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2020 USD ($) person building clinic patient Segment state | Mar. 31, 2019 USD ($) | Jan. 01, 2020 USD ($) | Dec. 31, 2019 USD ($)
Significant Accounting Policies [Line Items] |  |  |  |
Number of pharmacy plan members | person | 102 |  |  |
Number of patients served per year | patient | 1,000,000 |  |  |
Number of reportable segments | Segment | 4 |  |  |
Allowance for credit losses | $ 340 |  |  | $ 319
Health insurer fee | 271 |  |  |
Related party transaction, expenses from transactions with related party | 20 | $ 10 |  |
Related party transaction, other revenues from transactions with related party | $ 21 | $ 25 |  |
Heartland Healthcare Services |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Number of states in which entity operates | state | 4 |  |  |
Retail/ LTC |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Number of stores | building | 9,900 |  |  |
Number of walk in medical clinics | clinic | 1,100 |  |  |
Health Care Benefits |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Number of people served through health insurance products and related services | person | 34 |  |  |
Accounting Standards Update 2016-13 |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Adjustment to retained earnings |  |  | $ (3) |
Accounting Standards Update 2016-13 | Retained Earnings |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Adjustment to retained earnings |  |  | $ (3) |

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- Definition Represents the estimated amount of the health insurer fee accrued during the reporting period, as required by Health Care Reform. + References No definition available. + Details
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- Definition Number of Patients Served per Year + References No definition available. + Details
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- Definition Number of Walk In Medical Clinics + References No definition available. + Details
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