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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, 2019 USD ($) | Jun. 30, 2018 USD ($) | Jun. 30, 2019 USD ($) store | Jun. 30, 2018 USD ($)
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |
Operating income (loss) (GAAP measure) | $ 3,332 | $ (1,373) | $ 6,022 | $ 623
Amortization of intangible assets | 593 | 214 | 1,215 | 424
Acquisition-related transaction and integration costs | 106 | 39 | 254 | 82
Store rationalization charges | 0 | 0 | 135 | 0
Goodwill impairment | 0 | 3,921 | 0 | 3,921
Loss on divestiture of subsidiary | 0 | 0 | 0 | 86
Interest income on financing for the Aetna Acquisition | 0 | (202) | 0 | (244)
Adjusted operating income (loss) | $ 4,031 | $ 2,599 | 7,626 | 4,892
Retail Long-Term Care Segment |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |
Store rationalization charges |  |  | $ 135 |
Loss on divestiture of subsidiary |  |  |  | $ (725)
Number of under performing stores | store |  |  | 46 |

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- Definition The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3602-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16225-109274 + Details
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