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Segment Reporting - Reconciliation of Operating Earnings to Net Income (Details) |  |  | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Jul. 31, 2020 USD ($) | Jan. 02, 2018 USD ($) | Sep. 30, 2019 USD ($) store | Mar. 31, 2019 USD ($) store | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Aug. 31, 2019 USD ($) | Mar. 09, 2018 USD ($)
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |
Operating income (GAAP measure) |  |  |  |  | $ 13,911,000,000 | $ 11,987,000,000 | $ 4,021,000,000 |  |
Amortization of intangible assets |  |  |  |  | 2,341,000,000 | 2,436,000,000 | 1,006,000,000 |  |
Acquisition-related transaction and integration costs |  |  |  |  | 332,000,000 | 480,000,000 | 492,000,000 |  |
(Gain) loss on divestiture of subsidiary |  |  |  |  | (269,000,000) | 205,000,000 | 86,000,000 |  |
Receipt of fully reserved ACA risk corridor receivable |  |  |  |  | (307,000,000) | 0 | 0 |  |
Store rationalization charges |  |  |  |  | 0 | 231,000,000 | 0 |  |
Impairments |  |  |  |  | 0 | 0 | 6,149,000,000 |  |
Impairment of long-lived assets |  |  |  |  | 0 | 0 | 43,000,000 |  |
Interest income on financing for the Aetna Acquisition |  |  |  |  | 0 | 0 | (536,000,000) |  |
Adjusted operating income |  |  |  |  | 16,008,000,000 | $ 15,339,000,000 | 11,261,000,000 |  |
U.S. Department of Health and Human Services, ACA Risk Corridor Receivables [Member] | Settled Litigation |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |
Gain contingency, unrecorded amount |  |  |  |  |  |  |  | $ 313,000,000 |
Former gain contingency, recognized in current period, before tax |  |  |  |  | 307,000,000 |  |  |  |
Retail/ LTC |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |
Store rationalization charges |  |  | $ 96,000,000 | $ 135,000,000 |  |  |  |  |
Impairments |  |  |  |  |  |  | 6,149,000,000 |  |
Number of under performing stores, planned closure | store |  |  | 22 | 46 |  |  |  |  |
RX Crossroads |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |
(Gain) loss on divestiture of subsidiary |  |  |  |  |  |  | (725,000,000) |  |
RX Crossroads | Retail/ LTC | Discontinued Operations, Disposed of by Sale |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |
(Gain) loss on divestiture of subsidiary |  |  |  |  |  |  | $ 86,000,000 |  |
Proceeds from sale of subsidiary |  | $ 725,000,000 |  |  |  |  |  |  |
Coventry Health Care Workers Compensation Business | Health Care Benefits | Discontinued Operations, Disposed of by Sale |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |
(Gain) loss on divestiture of subsidiary |  |  |  |  | $ 269,000,000 |  |  |  |
Proceeds from sale of subsidiary | $ 850,000,000 |  |  |  |  |  |  |  |
2018 Senior Notes |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |
Debt issued in acquisition |  |  |  |  |  |  |  |  | $ 40,000,000,000

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