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Segment Reporting - Reconciliation from Operating Income to Adjusted Operating Income (Details) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2019 USD ($) store | Mar. 31, 2019 USD ($) store | Sep. 30, 2018 USD ($) | Sep. 30, 2019 USD ($) store | Sep. 30, 2018 USD ($)
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |  |
Operating income (GAAP measure) | $ 2,928 |  | $ 2,574 | $ 8,950 | $ 3,197
Amortization of intangible assets | 607 |  | 215 | 1,822 | 639
Acquisition-related transaction and integration costs | 111 |  | 70 | 365 | 152
Store rationalization charges | 96 |  | 0 | 231 | 0
Loss on sale of subsidiary | 205 |  | 0 | 205 | 86
Goodwill impairment | 0 |  | 0 | 0 | 3,921
Interest income on financing for the Aetna Acquisition | 0 |  | (209) | 0 | (453)
Adjusted operating income (loss) | 3,947 |  | 2,650 | $ 11,573 | 7,542
Corporate / Other |  |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |  |
Interest income on financing for the Aetna Acquisition |  |  | $ (209) |  | (453)
Retail Long-Term Care Segment |  |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |  |
Store rationalization charges | $ 96 | $ 135 |  |  |
Number of under performing stores | store | 22 | 46 |  | 22 |
RX Crossroads |  |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |  |
Loss on sale of subsidiary |  |  |  |  | $ 725

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