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Segment Reporting - Reconciliation from Operating Income to Adjusted Operating Income (Details) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2020 USD ($) | Jun. 30, 2019 USD ($) store | Jun. 30, 2020 USD ($) | Jun. 30, 2019 USD ($)
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |
Operating income (GAAP measure) | $ 4,680 | $ 3,332 | $ 8,138 | $ 6,022
Amortization of intangible assets | 578 | 593 | 1,164 | 1,215
Acquisition-related integration costs | 70 | 106 | 139 | 254
Store rationalization charges | 0 | 0 | 0 | 135
Adjusted operating income (loss) | $ 5,328 | $ 4,031 | $ 9,441 | $ 7,626
Retail/ LTC |  |  |  |
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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