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Segment Reporting - Reconciliation from Operating Income to Adjusted Operating Income (Details) $ in Millions |  | 3 Months Ended | 9 Months Ended
--- | --- | --- | ---
Jul. 31, 2020 USD ($) | Sep. 30, 2020 USD ($) | Sep. 30, 2019 USD ($) store | Sep. 30, 2020 USD ($) | Sep. 30, 2019 USD ($) store
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |  |
Operating income (GAAP measure) |  | $ 3,249 | $ 2,928 | $ 11,387 | $ 8,950
Amortization of intangible assets |  | 587 | 607 | 1,751 | 1,822
Acquisition-related integration costs |  | 57 | 111 | 196 | 365
(Gain) loss on sale of subsidiary |  | (271) | 205 | (271) | 205
Store rationalization charges |  | 0 | 96 | 0 | 231
Adjusted operating income (loss) |  | 3,622 | $ 3,947 | 13,063 | 11,573
Proceeds from sale of subsidiary |  |  |  | 834 | $ 0
Retail/ LTC |  |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |  |
Number of under performing stores | store |  |  | 22 |  | 22
Health Care Benefits | Discontinued Operations, Disposed of by Sale | Coventry Health Care Workers Compensation business |  |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |  |
(Gain) loss on sale of subsidiary |  | $ (271) |  | $ (271) |
Proceeds from sale of subsidiary | $ 850 |  |  |  |
Pharmacy Services |  |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |  |
Number of under performing stores | store |  |  |  |  | 46

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